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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-28 02:10:46 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-28 02:10:46 +0200
commit885f925eef411f549f17bc64dd054a3269cf66cd (patch)
tree6bac783d573a51e497ad28c19b5a71defac85f39 /drivers/cpufreq
parente4f5a3adc454745fea35f1c312e14cbeba6e0ea4 (diff)
parent45c009a9a447655aecbdb06c86126f05d0272171 (diff)
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Merge branch 'pm-cpufreq'
* pm-cpufreq: (57 commits) cpufreq: MAINTAINERS: Add co-maintainer cpufreq: pxa2xx: initialize variables ARM: S5pv210: compiling issue, ARM_S5PV210_CPUFREQ needs CONFIG_CPU_FREQ_TABLE=y cpufreq: cpu0: Put cpu parent node after using it cpufreq: ARM big LITTLE: Adapt to latest cpufreq updates cpufreq: ARM big LITTLE: put DT nodes after using them cpufreq: Don't call __cpufreq_governor() for drivers without target() cpufreq: exynos5440: Protect OPP search calls with RCU lock cpufreq: dbx500: Round to closest available freq cpufreq: Call __cpufreq_governor() with correct policy->cpus mask cpufreq / intel_pstate: Optimize intel_pstate_set_policy cpufreq: OMAP: instantiate omap-cpufreq as a platform_driver arm: exynos: Enable OPP library support for exynos5440 cpufreq: exynos: Remove error return even if no soc is found cpufreq: exynos: Add cpufreq driver for exynos5440 cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor cpufreq: ondemand: allow custom powersave_bias_target handler to be registered cpufreq: convert cpufreq_driver to using RCU cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq cpufreq: sparc: move cpufreq driver to drivers/cpufreq ... Conflicts: MAINTAINERS (with commit a8e39c3 from pm-cpuidle) drivers/cpufreq/cpufreq_governor.h (with commit beb0ff3)
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/Kconfig89
-rw-r--r--drivers/cpufreq/Kconfig.arm148
-rw-r--r--drivers/cpufreq/Kconfig.powerpc18
-rw-r--r--drivers/cpufreq/Kconfig.x8617
-rw-r--r--drivers/cpufreq/Makefile41
-rw-r--r--drivers/cpufreq/acpi-cpufreq.c11
-rw-r--r--drivers/cpufreq/amd_freq_sensitivity.c148
-rw-r--r--drivers/cpufreq/arm_big_little.c278
-rw-r--r--drivers/cpufreq/arm_big_little.h40
-rw-r--r--drivers/cpufreq/arm_big_little_dt.c107
-rw-r--r--drivers/cpufreq/at32ap-cpufreq.c123
-rw-r--r--drivers/cpufreq/blackfin-cpufreq.c247
-rw-r--r--drivers/cpufreq/cpufreq-cpu0.c32
-rw-r--r--drivers/cpufreq/cpufreq-nforce2.c11
-rw-r--r--drivers/cpufreq/cpufreq.c418
-rw-r--r--drivers/cpufreq/cpufreq_conservative.c244
-rw-r--r--drivers/cpufreq/cpufreq_governor.c291
-rw-r--r--drivers/cpufreq/cpufreq_governor.h128
-rw-r--r--drivers/cpufreq/cpufreq_ondemand.c363
-rw-r--r--drivers/cpufreq/cris-artpec3-cpufreq.c146
-rw-r--r--drivers/cpufreq/cris-etraxfs-cpufreq.c142
-rw-r--r--drivers/cpufreq/davinci-cpufreq.c231
-rw-r--r--drivers/cpufreq/dbx500-cpufreq.c22
-rw-r--r--drivers/cpufreq/e_powersaver.c11
-rw-r--r--drivers/cpufreq/elanfreq.c10
-rw-r--r--drivers/cpufreq/exynos-cpufreq.c9
-rw-r--r--drivers/cpufreq/exynos5440-cpufreq.c481
-rw-r--r--drivers/cpufreq/gx-suspmod.c11
-rw-r--r--drivers/cpufreq/ia64-acpi-cpufreq.c438
-rw-r--r--drivers/cpufreq/imx6q-cpufreq.c12
-rw-r--r--drivers/cpufreq/integrator-cpufreq.c220
-rw-r--r--drivers/cpufreq/intel_pstate.c21
-rw-r--r--drivers/cpufreq/kirkwood-cpufreq.c18
-rw-r--r--drivers/cpufreq/longhaul.c18
-rw-r--r--drivers/cpufreq/loongson2_cpufreq.c248
-rw-r--r--drivers/cpufreq/maple-cpufreq.c5
-rw-r--r--drivers/cpufreq/omap-cpufreq.c34
-rw-r--r--drivers/cpufreq/p4-clockmod.c13
-rw-r--r--drivers/cpufreq/pcc-cpufreq.c5
-rw-r--r--drivers/cpufreq/powernow-k6.c12
-rw-r--r--drivers/cpufreq/powernow-k7.c10
-rw-r--r--drivers/cpufreq/powernow-k8.c19
-rw-r--r--drivers/cpufreq/ppc_cbe_cpufreq.c209
-rw-r--r--drivers/cpufreq/ppc_cbe_cpufreq.h24
-rw-r--r--drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c115
-rw-r--r--drivers/cpufreq/ppc_cbe_cpufreq_pmi.c156
-rw-r--r--drivers/cpufreq/pxa2xx-cpufreq.c492
-rw-r--r--drivers/cpufreq/pxa3xx-cpufreq.c254
-rw-r--r--drivers/cpufreq/s3c2416-cpufreq.c5
-rw-r--r--drivers/cpufreq/s3c64xx-cpufreq.c7
-rw-r--r--drivers/cpufreq/s5pv210-cpufreq.c5
-rw-r--r--drivers/cpufreq/sa1100-cpufreq.c247
-rw-r--r--drivers/cpufreq/sa1110-cpufreq.c406
-rw-r--r--drivers/cpufreq/sc520_freq.c10
-rw-r--r--drivers/cpufreq/sh-cpufreq.c189
-rw-r--r--drivers/cpufreq/sparc-us2e-cpufreq.c408
-rw-r--r--drivers/cpufreq/sparc-us3-cpufreq.c269
-rw-r--r--drivers/cpufreq/spear-cpufreq.c7
-rw-r--r--drivers/cpufreq/speedstep-centrino.c28
-rw-r--r--drivers/cpufreq/speedstep-ich.c12
-rw-r--r--drivers/cpufreq/speedstep-smi.c5
-rw-r--r--drivers/cpufreq/tegra-cpufreq.c292
-rw-r--r--drivers/cpufreq/unicore2-cpufreq.c92
63 files changed, 7366 insertions, 756 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index cbcb21e32771..a1488f58f6ca 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -205,10 +205,99 @@ depends on ARM
source "drivers/cpufreq/Kconfig.arm"
endmenu
+menu "AVR32 CPU frequency scaling drivers"
+depends on AVR32
+
+config AVR32_AT32AP_CPUFREQ
+ bool "CPU frequency driver for AT32AP"
+ depends on PLATFORM_AT32AP
+ default n
+ help
+ This enables the CPU frequency driver for AT32AP processors.
+ If in doubt, say N.
+
+endmenu
+
+menu "CPUFreq processor drivers"
+depends on IA64
+
+config IA64_ACPI_CPUFREQ
+ tristate "ACPI Processor P-States driver"
+ select CPU_FREQ_TABLE
+ depends on ACPI_PROCESSOR
+ help
+ This driver adds a CPUFreq driver which utilizes the ACPI
+ Processor Performance States.
+
+ For details, take a look at <file:Documentation/cpu-freq/>.
+
+ If in doubt, say N.
+
+endmenu
+
+menu "MIPS CPUFreq processor drivers"
+depends on MIPS
+
+config LOONGSON2_CPUFREQ
+ tristate "Loongson2 CPUFreq Driver"
+ select CPU_FREQ_TABLE
+ help
+ This option adds a CPUFreq driver for loongson processors which
+ support software configurable cpu frequency.
+
+ Loongson2F and it's successors support this feature.
+
+ For details, take a look at <file:Documentation/cpu-freq/>.
+
+ If in doubt, say N.
+
+endmenu
+
menu "PowerPC CPU frequency scaling drivers"
depends on PPC32 || PPC64
source "drivers/cpufreq/Kconfig.powerpc"
endmenu
+menu "SPARC CPU frequency scaling drivers"
+depends on SPARC64
+config SPARC_US3_CPUFREQ
+ tristate "UltraSPARC-III CPU Frequency driver"
+ select CPU_FREQ_TABLE
+ help
+ This adds the CPUFreq driver for UltraSPARC-III processors.
+
+ For details, take a look at <file:Documentation/cpu-freq>.
+
+ If in doubt, say N.
+
+config SPARC_US2E_CPUFREQ
+ tristate "UltraSPARC-IIe CPU Frequency driver"
+ select CPU_FREQ_TABLE
+ help
+ This adds the CPUFreq driver for UltraSPARC-IIe processors.
+
+ For details, take a look at <file:Documentation/cpu-freq>.
+
+ If in doubt, say N.
+endmenu
+
+menu "SH CPU Frequency scaling"
+depends on SUPERH
+config SH_CPU_FREQ
+ tristate "SuperH CPU Frequency driver"
+ select CPU_FREQ_TABLE
+ help
+ This adds the cpufreq driver for SuperH. Any CPU that supports
+ clock rate rounding through the clock framework can use this
+ driver. While it will make the kernel slightly larger, this is
+ harmless for CPUs that don't support rate rounding. The driver
+ will also generate a notice in the boot log before disabling
+ itself if the CPU in question is not capable of rate rounding.
+
+ For details, take a look at <file:Documentation/cpu-freq>.
+
+ If unsure, say N.
+endmenu
+
endif
endmenu
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 030ddf6dd3f1..f3af18b9acc5 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -2,6 +2,93 @@
# ARM CPU Frequency scaling drivers
#
+config ARM_BIG_LITTLE_CPUFREQ
+ tristate
+ depends on ARM_CPU_TOPOLOGY
+
+config ARM_DT_BL_CPUFREQ
+ tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
+ select ARM_BIG_LITTLE_CPUFREQ
+ depends on OF && HAVE_CLK
+ help
+ This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
+ This gets frequency tables from DT.
+
+config ARM_EXYNOS_CPUFREQ
+ bool "SAMSUNG EXYNOS SoCs"
+ depends on ARCH_EXYNOS
+ default y
+ help
+ This adds the CPUFreq driver common part for Samsung
+ EXYNOS SoCs.
+
+ If in doubt, say N.
+
+config ARM_EXYNOS4210_CPUFREQ
+ def_bool CPU_EXYNOS4210
+ help
+ This adds the CPUFreq driver for Samsung EXYNOS4210
+ SoC (S5PV310 or S5PC210).
+
+config ARM_EXYNOS4X12_CPUFREQ
+ def_bool (SOC_EXYNOS4212 || SOC_EXYNOS4412)
+ help
+ This adds the CPUFreq driver for Samsung EXYNOS4X12
+ SoC (EXYNOS4212 or EXYNOS4412).
+
+config ARM_EXYNOS5250_CPUFREQ
+ def_bool SOC_EXYNOS5250
+ help
+ This adds the CPUFreq driver for Samsung EXYNOS5250
+ SoC.
+
+config ARM_EXYNOS5440_CPUFREQ
+ def_bool SOC_EXYNOS5440
+ depends on HAVE_CLK && PM_OPP && OF
+ help
+ This adds the CPUFreq driver for Samsung EXYNOS5440
+ SoC. The nature of exynos5440 clock controller is
+ different than previous exynos controllers so not using
+ the common exynos framework.
+
+config ARM_HIGHBANK_CPUFREQ
+ tristate "Calxeda Highbank-based"
+ depends on ARCH_HIGHBANK
+ select CPU_FREQ_TABLE
+ select GENERIC_CPUFREQ_CPU0
+ select PM_OPP
+ select REGULATOR
+
+ default m
+ help
+ This adds the CPUFreq driver for Calxeda Highbank SoC
+ based boards.
+
+ If in doubt, say N.
+
+config ARM_IMX6Q_CPUFREQ
+ tristate "Freescale i.MX6Q cpufreq support"
+ depends on SOC_IMX6Q
+ depends on REGULATOR_ANATOP
+ help
+ This adds cpufreq driver support for Freescale i.MX6Q SOC.
+
+ If in doubt, say N.
+
+config ARM_INTEGRATOR
+ tristate "CPUfreq driver for ARM Integrator CPUs"
+ depends on ARCH_INTEGRATOR
+ default y
+ help
+ This enables the CPUfreq driver for ARM Integrator CPUs.
+ If in doubt, say Y.
+
+config ARM_KIRKWOOD_CPUFREQ
+ def_bool ARCH_KIRKWOOD && OF
+ help
+ This adds the CPUFreq driver for Marvell Kirkwood
+ SoCs.
+
config ARM_OMAP2PLUS_CPUFREQ
bool "TI OMAP2+"
depends on ARCH_OMAP2PLUS
@@ -42,6 +129,7 @@ config ARM_S3C64XX_CPUFREQ
config ARM_S5PV210_CPUFREQ
bool "Samsung S5PV210 and S5PC110"
depends on CPU_S5PV210
+ select CPU_FREQ_TABLE
default y
help
This adds the CPUFreq driver for Samsung S5PV210 and
@@ -49,48 +137,11 @@ config ARM_S5PV210_CPUFREQ
If in doubt, say N.
-config ARM_EXYNOS_CPUFREQ
- bool "SAMSUNG EXYNOS SoCs"
- depends on ARCH_EXYNOS
- default y
- help
- This adds the CPUFreq driver common part for Samsung
- EXYNOS SoCs.
-
- If in doubt, say N.
+config ARM_SA1100_CPUFREQ
+ bool
-config ARM_EXYNOS4210_CPUFREQ
- def_bool CPU_EXYNOS4210
- help
- This adds the CPUFreq driver for Samsung EXYNOS4210
- SoC (S5PV310 or S5PC210).
-
-config ARM_EXYNOS4X12_CPUFREQ
- def_bool (SOC_EXYNOS4212 || SOC_EXYNOS4412)
- help
- This adds the CPUFreq driver for Samsung EXYNOS4X12
- SoC (EXYNOS4212 or EXYNOS4412).
-
-config ARM_EXYNOS5250_CPUFREQ
- def_bool SOC_EXYNOS5250
- help
- This adds the CPUFreq driver for Samsung EXYNOS5250
- SoC.
-
-config ARM_KIRKWOOD_CPUFREQ
- def_bool ARCH_KIRKWOOD && OF
- help
- This adds the CPUFreq driver for Marvell Kirkwood
- SoCs.
-
-config ARM_IMX6Q_CPUFREQ
- tristate "Freescale i.MX6Q cpufreq support"
- depends on SOC_IMX6Q
- depends on REGULATOR_ANATOP
- help
- This adds cpufreq driver support for Freescale i.MX6Q SOC.
-
- If in doubt, say N.
+config ARM_SA1110_CPUFREQ
+ bool
config ARM_SPEAR_CPUFREQ
bool "SPEAr CPUFreq support"
@@ -98,18 +149,3 @@ config ARM_SPEAR_CPUFREQ
default y
help
This adds the CPUFreq driver support for SPEAr SOCs.
-
-config ARM_HIGHBANK_CPUFREQ
- tristate "Calxeda Highbank-based"
- depends on ARCH_HIGHBANK
- select CPU_FREQ_TABLE
- select GENERIC_CPUFREQ_CPU0
- select PM_OPP
- select REGULATOR
-
- default m
- help
- This adds the CPUFreq driver for Calxeda Highbank SoC
- based boards.
-
- If in doubt, say N.
diff --git a/drivers/cpufreq/Kconfig.powerpc b/drivers/cpufreq/Kconfig.powerpc
index e76992f79683..9c926ca0d718 100644
--- a/drivers/cpufreq/Kconfig.powerpc
+++ b/drivers/cpufreq/Kconfig.powerpc
@@ -1,3 +1,21 @@
+config CPU_FREQ_CBE
+ tristate "CBE frequency scaling"
+ depends on CBE_RAS && PPC_CELL
+ default m
+ help
+ This adds the cpufreq driver for Cell BE processors.
+ For details, take a look at <file:Documentation/cpu-freq/>.
+ If you don't have such processor, say N
+
+config CPU_FREQ_CBE_PMI
+ bool "CBE frequency scaling using PMI interface"
+ depends on CPU_FREQ_CBE
+ default n
+ help
+ Select this, if you want to use the PMI interface to switch
+ frequencies. Using PMI, the processor will not only be able to run at
+ lower speed, but also at lower core voltage.
+
config CPU_FREQ_MAPLE
bool "Support for Maple 970FX Evaluation Board"
depends on PPC_MAPLE
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index d7dc0ed6adb0..2b8a8c374548 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -129,6 +129,23 @@ config X86_POWERNOW_K8
For details, take a look at <file:Documentation/cpu-freq/>.
+config X86_AMD_FREQ_SENSITIVITY
+ tristate "AMD frequency sensitivity feedback powersave bias"
+ depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
+ help
+ This adds AMD-specific powersave bias function to the ondemand
+ governor, which allows it to make more power-conscious frequency
+ change decisions based on feedback from hardware (availble on AMD
+ Family 16h and above).
+
+ Hardware feedback tells software how "sensitive" to frequency changes
+ the CPUs' workloads are. CPU-bound workloads will be more sensitive
+ -- they will perform better as frequency increases. Memory/IO-bound
+ workloads will be less sensitive -- they will not necessarily perform
+ better as frequency increases.
+
+ If in doubt, say N.
+
config X86_GX_SUSPMOD
tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
depends on X86_32 && PCI
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 863fd1865d45..315b9231feb1 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -41,23 +41,54 @@ obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
obj-$(CONFIG_X86_CPUFREQ_NFORCE2) += cpufreq-nforce2.o
obj-$(CONFIG_X86_INTEL_PSTATE) += intel_pstate.o
+obj-$(CONFIG_X86_AMD_FREQ_SENSITIVITY) += amd_freq_sensitivity.o
##################################################################################
# ARM SoC drivers
+obj-$(CONFIG_ARM_BIG_LITTLE_CPUFREQ) += arm_big_little.o
+# big LITTLE per platform glues. Keep DT_BL_CPUFREQ as the last entry in all big
+# LITTLE drivers, so that it is probed last.
+obj-$(CONFIG_ARM_DT_BL_CPUFREQ) += arm_big_little_dt.o
+
+obj-$(CONFIG_ARCH_DAVINCI_DA850) += davinci-cpufreq.o
obj-$(CONFIG_UX500_SOC_DB8500) += dbx500-cpufreq.o
-obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o
-obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o
-obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += exynos-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o
obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ) += exynos5250-cpufreq.o
+obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ) += exynos5440-cpufreq.o
+obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ) += highbank-cpufreq.o
+obj-$(CONFIG_ARM_IMX6Q_CPUFREQ) += imx6q-cpufreq.o
+obj-$(CONFIG_ARM_INTEGRATOR) += integrator-cpufreq.o
obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ) += kirkwood-cpufreq.o
obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
+obj-$(CONFIG_PXA25x) += pxa2xx-cpufreq.o
+obj-$(CONFIG_PXA27x) += pxa2xx-cpufreq.o
+obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
+obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o
+obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o
+obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o
+obj-$(CONFIG_ARM_SA1100_CPUFREQ) += sa1100-cpufreq.o
+obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa1110-cpufreq.o
obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
-obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ) += highbank-cpufreq.o
-obj-$(CONFIG_ARM_IMX6Q_CPUFREQ) += imx6q-cpufreq.o
+obj-$(CONFIG_ARCH_TEGRA) += tegra-cpufreq.o
##################################################################################
# PowerPC platform drivers
+obj-$(CONFIG_CPU_FREQ_CBE) += ppc-cbe-cpufreq.o
+ppc-cbe-cpufreq-y += ppc_cbe_cpufreq_pervasive.o ppc_cbe_cpufreq.o
+obj-$(CONFIG_CPU_FREQ_CBE_PMI) += ppc_cbe_cpufreq_pmi.o
obj-$(CONFIG_CPU_FREQ_MAPLE) += maple-cpufreq.o
+
+##################################################################################
+# Other platform drivers
+obj-$(CONFIG_AVR32_AT32AP_CPUFREQ) += at32ap-cpufreq.o
+obj-$(CONFIG_BLACKFIN) += blackfin-cpufreq.o
+obj-$(CONFIG_CRIS_MACH_ARTPEC3) += cris-artpec3-cpufreq.o
+obj-$(CONFIG_ETRAXFS) += cris-etraxfs-cpufreq.o
+obj-$(CONFIG_IA64_ACPI_CPUFREQ) += ia64-acpi-cpufreq.o
+obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o
+obj-$(CONFIG_SH_CPU_FREQ) += sh-cpufreq.o
+obj-$(CONFIG_SPARC_US2E_CPUFREQ) += sparc-us2e-cpufreq.o
+obj-$(CONFIG_SPARC_US3_CPUFREQ) += sparc-us3-cpufreq.o
+obj-$(CONFIG_UNICORE32) += unicore2-cpufreq.o
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 57a8774f0b4e..11b8b4b54ceb 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -423,7 +423,6 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
struct drv_cmd cmd;
unsigned int next_state = 0; /* Index into freq_table */
unsigned int next_perf_state = 0; /* Index into perf table */
- unsigned int i;
int result = 0;
pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
@@ -486,10 +485,7 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
freqs.old = perf->states[perf->state].core_frequency * 1000;
freqs.new = data->freq_table[next_state].frequency;
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
drv_write(&cmd);
@@ -502,10 +498,7 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
}
}
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
perf->state = next_perf_state;
out:
diff --git a/drivers/cpufreq/amd_freq_sensitivity.c b/drivers/cpufreq/amd_freq_sensitivity.c
new file mode 100644
index 000000000000..f6b79ab0070b
--- /dev/null
+++ b/drivers/cpufreq/amd_freq_sensitivity.c
@@ -0,0 +1,148 @@
+/*
+ * amd_freq_sensitivity.c: AMD frequency sensitivity feedback powersave bias
+ * for the ondemand governor.
+ *
+ * Copyright (C) 2013 Advanced Micro Devices, Inc.
+ *
+ * Author: Jacob Shin <jacob.shin@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/percpu-defs.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+
+#include <asm/msr.h>
+#include <asm/cpufeature.h>
+
+#include "cpufreq_governor.h"
+
+#define MSR_AMD64_FREQ_SENSITIVITY_ACTUAL 0xc0010080
+#define MSR_AMD64_FREQ_SENSITIVITY_REFERENCE 0xc0010081
+#define CLASS_CODE_SHIFT 56
+#define POWERSAVE_BIAS_MAX 1000
+#define POWERSAVE_BIAS_DEF 400
+
+struct cpu_data_t {
+ u64 actual;
+ u64 reference;
+ unsigned int freq_prev;
+};
+
+static DEFINE_PER_CPU(struct cpu_data_t, cpu_data);
+
+static unsigned int amd_powersave_bias_target(struct cpufreq_policy *policy,
+ unsigned int freq_next,
+ unsigned int relation)
+{
+ int sensitivity;
+ long d_actual, d_reference;
+ struct msr actual, reference;
+ struct cpu_data_t *data = &per_cpu(cpu_data, policy->cpu);
+ struct dbs_data *od_data = policy->governor_data;
+ struct od_dbs_tuners *od_tuners = od_data->tuners;
+ struct od_cpu_dbs_info_s *od_info =
+ od_data->cdata->get_cpu_dbs_info_s(policy->cpu);
+
+ if (!od_info->freq_table)
+ return freq_next;
+
+ rdmsr_on_cpu(policy->cpu, MSR_AMD64_FREQ_SENSITIVITY_ACTUAL,
+ &actual.l, &actual.h);
+ rdmsr_on_cpu(policy->cpu, MSR_AMD64_FREQ_SENSITIVITY_REFERENCE,
+ &reference.l, &reference.h);
+ actual.h &= 0x00ffffff;
+ reference.h &= 0x00ffffff;
+
+ /* counter wrapped around, so stay on current frequency */
+ if (actual.q < data->actual || reference.q < data->reference) {
+ freq_next = policy->cur;
+ goto out;
+ }
+
+ d_actual = actual.q - data->actual;
+ d_reference = reference.q - data->reference;
+
+ /* divide by 0, so stay on current frequency as well */
+ if (d_reference == 0) {
+ freq_next = policy->cur;
+ goto out;
+ }
+
+ sensitivity = POWERSAVE_BIAS_MAX -
+ (POWERSAVE_BIAS_MAX * (d_reference - d_actual) / d_reference);
+
+ clamp(sensitivity, 0, POWERSAVE_BIAS_MAX);
+
+ /* this workload is not CPU bound, so choose a lower freq */
+ if (sensitivity < od_tuners->powersave_bias) {
+ if (data->freq_prev == policy->cur)
+ freq_next = policy->cur;
+
+ if (freq_next > policy->cur)
+ freq_next = policy->cur;
+ else if (freq_next < policy->cur)
+ freq_next = policy->min;
+ else {
+ unsigned int index;
+
+ cpufreq_frequency_table_target(policy,
+ od_info->freq_table, policy->cur - 1,
+ CPUFREQ_RELATION_H, &index);
+ freq_next = od_info->freq_table[index].frequency;
+ }
+
+ data->freq_prev = freq_next;
+ } else
+ data->freq_prev = 0;
+
+out:
+ data->actual = actual.q;
+ data->reference = reference.q;
+ return freq_next;
+}
+
+static int __init amd_freq_sensitivity_init(void)
+{
+ u64 val;
+
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+ return -ENODEV;
+
+ if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
+ return -ENODEV;
+
+ if (rdmsrl_safe(MSR_AMD64_FREQ_SENSITIVITY_ACTUAL, &val))
+ return -ENODEV;
+
+ if (!(val >> CLASS_CODE_SHIFT))
+ return -ENODEV;
+
+ od_register_powersave_bias_handler(amd_powersave_bias_target,
+ POWERSAVE_BIAS_DEF);
+ return 0;
+}
+late_initcall(amd_freq_sensitivity_init);
+
+static void __exit amd_freq_sensitivity_exit(void)
+{
+ od_unregister_powersave_bias_handler();
+}
+module_exit(amd_freq_sensitivity_exit);
+
+static const struct x86_cpu_id amd_freq_sensitivity_ids[] = {
+ X86_FEATURE_MATCH(X86_FEATURE_PROC_FEEDBACK),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, amd_freq_sensitivity_ids);
+
+MODULE_AUTHOR("Jacob Shin <jacob.shin@amd.com>");
+MODULE_DESCRIPTION("AMD frequency sensitivity feedback powersave bias for "
+ "the ondemand governor.");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
new file mode 100644
index 000000000000..dbdf677d2f36
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little.c
@@ -0,0 +1,278 @@
+/*
+ * ARM big.LITTLE Platforms CPUFreq support
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+ *
+ * Copyright (C) 2013 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/export.h>
+#include <linux/of_platform.h>
+#include <linux/opp.h>
+#include <linux/slab.h>
+#include <linux/topology.h>
+#include <linux/types.h>
+
+#include "arm_big_little.h"
+
+/* Currently we support only two clusters */
+#define MAX_CLUSTERS 2
+
+static struct cpufreq_arm_bL_ops *arm_bL_ops;
+static struct clk *clk[MAX_CLUSTERS];
+static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS];
+static atomic_t cluster_usage[MAX_CLUSTERS] = {ATOMIC_INIT(0), ATOMIC_INIT(0)};
+
+static int cpu_to_cluster(int cpu)
+{
+ return topology_physical_package_id(cpu);
+}
+
+static unsigned int bL_cpufreq_get(unsigned int cpu)
+{
+ u32 cur_cluster = cpu_to_cluster(cpu);
+
+ return clk_get_rate(clk[cur_cluster]) / 1000;
+}
+
+/* Validate policy frequency range */
+static int bL_cpufreq_verify_policy(struct cpufreq_policy *policy)
+{
+ u32 cur_cluster = cpu_to_cluster(policy->cpu);
+
+ return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
+}
+
+/* Set clock frequency */
+static int bL_cpufreq_set_target(struct cpufreq_policy *policy,
+ unsigned int target_freq, unsigned int relation)
+{
+ struct cpufreq_freqs freqs;
+ u32 cpu = policy->cpu, freq_tab_idx, cur_cluster;
+ int ret = 0;
+
+ cur_cluster = cpu_to_cluster(policy->cpu);
+
+ freqs.old = bL_cpufreq_get(policy->cpu);
+
+ /* Determine valid target frequency using freq_table */
+ cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
+ target_freq, relation, &freq_tab_idx);
+ freqs.new = freq_table[cur_cluster][freq_tab_idx].frequency;
+
+ pr_debug("%s: cpu: %d, cluster: %d, oldfreq: %d, target freq: %d, new freq: %d\n",
+ __func__, cpu, cur_cluster, freqs.old, target_freq,
+ freqs.new);
+
+ if (freqs.old == freqs.new)
+ return 0;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ ret = clk_set_rate(clk[cur_cluster], freqs.new * 1000);
+ if (ret) {
+ pr_err("clk_set_rate failed: %d\n", ret);
+ return ret;
+ }
+
+ policy->cur = freqs.new;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return ret;
+}
+
+static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
+{
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
+
+ if (!atomic_dec_return(&cluster_usage[cluster])) {
+ clk_put(clk[cluster]);
+ opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+ dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster);
+ }
+}
+
+static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
+{
+ u32 cluster = cpu_to_cluster(cpu_dev->id);
+ char name[14] = "cpu-cluster.";
+ int ret;
+
+ if (atomic_inc_return(&cluster_usage[cluster]) != 1)
+ return 0;
+
+ ret = arm_bL_ops->init_opp_table(cpu_dev);
+ if (ret) {
+ dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n",
+ __func__, cpu_dev->id, ret);
+ goto atomic_dec;
+ }
+
+ ret = opp_init_cpufreq_table(cpu_dev, &freq_table[cluster]);
+ if (ret) {
+ dev_err(cpu_dev, "%s: failed to init cpufreq table, cpu: %d, err: %d\n",
+ __func__, cpu_dev->id, ret);
+ goto atomic_dec;
+ }
+
+ name[12] = cluster + '0';
+ clk[cluster] = clk_get_sys(name, NULL);
+ if (!IS_ERR(clk[cluster])) {
+ dev_dbg(cpu_dev, "%s: clk: %p & freq table: %p, cluster: %d\n",
+ __func__, clk[cluster], freq_table[cluster],
+ cluster);
+ return 0;
+ }
+
+ dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d, cluster: %d\n",
+ __func__, cpu_dev->id, cluster);
+ ret = PTR_ERR(clk[cluster]);
+ opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+
+atomic_dec:
+ atomic_dec(&cluster_usage[cluster]);
+ dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__,
+ cluster);
+ return ret;
+}
+
+/* Per-CPU initialization */
+static int bL_cpufreq_init(struct cpufreq_policy *policy)
+{
+ u32 cur_cluster = cpu_to_cluster(policy->cpu);
+ struct device *cpu_dev;
+ int ret;
+
+ cpu_dev = get_cpu_device(policy->cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ policy->cpu);
+ return -ENODEV;
+ }
+
+ ret = get_cluster_clk_and_freq_table(cpu_dev);
+ if (ret)
+ return ret;
+
+ ret = cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
+ if (ret) {
+ dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
+ policy->cpu, cur_cluster);
+ put_cluster_clk_and_freq_table(cpu_dev);
+ return ret;
+ }
+
+ cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
+
+ if (arm_bL_ops->get_transition_latency)
+ policy->cpuinfo.transition_latency =
+ arm_bL_ops->get_transition_latency(cpu_dev);
+ else
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+
+ policy->cur = bL_cpufreq_get(policy->cpu);
+
+ cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+
+ dev_info(cpu_dev, "CPU %d initialized\n", policy->cpu);
+ return 0;
+}
+
+static int bL_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ struct device *cpu_dev;
+
+ cpu_dev = get_cpu_device(policy->cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ policy->cpu);
+ return -ENODEV;
+ }
+
+ put_cluster_clk_and_freq_table(cpu_dev);
+ dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);
+
+ return 0;
+}
+
+/* Export freq_table to sysfs */
+static struct freq_attr *bL_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver bL_cpufreq_driver = {
+ .name = "arm-big-little",
+ .flags = CPUFREQ_STICKY,
+ .verify = bL_cpufreq_verify_policy,
+ .target = bL_cpufreq_set_target,
+ .get = bL_cpufreq_get,
+ .init = bL_cpufreq_init,
+ .exit = bL_cpufreq_exit,
+ .have_governor_per_policy = true,
+ .attr = bL_cpufreq_attr,
+};
+
+int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
+{
+ int ret;
+
+ if (arm_bL_ops) {
+ pr_debug("%s: Already registered: %s, exiting\n", __func__,
+ arm_bL_ops->name);
+ return -EBUSY;
+ }
+
+ if (!ops || !strlen(ops->name) || !ops->init_opp_table) {
+ pr_err("%s: Invalid arm_bL_ops, exiting\n", __func__);
+ return -ENODEV;
+ }
+
+ arm_bL_ops = ops;
+
+ ret = cpufreq_register_driver(&bL_cpufreq_driver);
+ if (ret) {
+ pr_info("%s: Failed registering platform driver: %s, err: %d\n",
+ __func__, ops->name, ret);
+ arm_bL_ops = NULL;
+ } else {
+ pr_info("%s: Registered platform driver: %s\n", __func__,
+ ops->name);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(bL_cpufreq_register);
+
+void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
+{
+ if (arm_bL_ops != ops) {
+ pr_err("%s: Registered with: %s, can't unregister, exiting\n",
+ __func__, arm_bL_ops->name);
+ return;
+ }
+
+ cpufreq_unregister_driver(&bL_cpufreq_driver);
+ pr_info("%s: Un-registered platform driver: %s\n", __func__,
+ arm_bL_ops->name);
+ arm_bL_ops = NULL;
+}
+EXPORT_SYMBOL_GPL(bL_cpufreq_unregister);
diff --git a/drivers/cpufreq/arm_big_little.h b/drivers/cpufreq/arm_big_little.h
new file mode 100644
index 000000000000..70f18fc12d4a
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little.h
@@ -0,0 +1,40 @@
+/*
+ * ARM big.LITTLE platform's CPUFreq header file
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+ *
+ * Copyright (C) 2013 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef CPUFREQ_ARM_BIG_LITTLE_H
+#define CPUFREQ_ARM_BIG_LITTLE_H
+
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/types.h>
+
+struct cpufreq_arm_bL_ops {
+ char name[CPUFREQ_NAME_LEN];
+ int (*get_transition_latency)(struct device *cpu_dev);
+
+ /*
+ * This must set opp table for cpu_dev in a similar way as done by
+ * of_init_opp_table().
+ */
+ int (*init_opp_table)(struct device *cpu_dev);
+};
+
+int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
+void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops);
+
+#endif /* CPUFREQ_ARM_BIG_LITTLE_H */
diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c
new file mode 100644
index 000000000000..44be3115375c
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little_dt.c
@@ -0,0 +1,107 @@
+/*
+ * Generic big.LITTLE CPUFreq Interface driver
+ *
+ * It provides necessary ops to arm_big_little cpufreq driver and gets
+ * Frequency information from Device Tree. Freq table in DT must be in KHz.
+ *
+ * Copyright (C) 2013 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/opp.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include "arm_big_little.h"
+
+static int dt_init_opp_table(struct device *cpu_dev)
+{
+ struct device_node *np, *parent;
+ int count = 0, ret;
+
+ parent = of_find_node_by_path("/cpus");
+ if (!parent) {
+ pr_err("failed to find OF /cpus\n");
+ return -ENOENT;
+ }
+
+ for_each_child_of_node(parent, np) {
+ if (count++ != cpu_dev->id)
+ continue;
+ if (!of_get_property(np, "operating-points", NULL)) {
+ ret = -ENODATA;
+ } else {
+ cpu_dev->of_node = np;
+ ret = of_init_opp_table(cpu_dev);
+ }
+ of_node_put(np);
+ of_node_put(parent);
+
+ return ret;
+ }
+
+ return -ENODEV;
+}
+
+static int dt_get_transition_latency(struct device *cpu_dev)
+{
+ struct device_node *np, *parent;
+ u32 transition_latency = CPUFREQ_ETERNAL;
+ int count = 0;
+
+ parent = of_find_node_by_path("/cpus");
+ if (!parent) {
+ pr_err("failed to find OF /cpus\n");
+ return -ENOENT;
+ }
+
+ for_each_child_of_node(parent, np) {
+ if (count++ != cpu_dev->id)
+ continue;
+
+ of_property_read_u32(np, "clock-latency", &transition_latency);
+ of_node_put(np);
+ of_node_put(parent);
+
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static struct cpufreq_arm_bL_ops dt_bL_ops = {
+ .name = "dt-bl",
+ .get_transition_latency = dt_get_transition_latency,
+ .init_opp_table = dt_init_opp_table,
+};
+
+static int generic_bL_init(void)
+{
+ return bL_cpufreq_register(&dt_bL_ops);
+}
+module_init(generic_bL_init);
+
+static void generic_bL_exit(void)
+{
+ return bL_cpufreq_unregister(&dt_bL_ops);
+}
+module_exit(generic_bL_exit);
+
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/at32ap-cpufreq.c b/drivers/cpufreq/at32ap-cpufreq.c
new file mode 100644
index 000000000000..654488723cb5
--- /dev/null
+++ b/drivers/cpufreq/at32ap-cpufreq.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * Based on MIPS implementation arch/mips/kernel/time.c
+ * Copyright 2001 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*#define DEBUG*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/export.h>
+
+static struct clk *cpuclk;
+
+static int at32_verify_speed(struct cpufreq_policy *policy)
+{
+ if (policy->cpu != 0)
+ return -EINVAL;
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+ return 0;
+}
+
+static unsigned int at32_get_speed(unsigned int cpu)
+{
+ /* No SMP support */
+ if (cpu)
+ return 0;
+ return (unsigned int)((clk_get_rate(cpuclk) + 500) / 1000);
+}
+
+static unsigned int ref_freq;
+static unsigned long loops_per_jiffy_ref;
+
+static int at32_set_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct cpufreq_freqs freqs;
+ long freq;
+
+ /* Convert target_freq from kHz to Hz */
+ freq = clk_round_rate(cpuclk, target_freq * 1000);
+
+ /* Check if policy->min <= new_freq <= policy->max */
+ if(freq < (policy->min * 1000) || freq > (policy->max * 1000))
+ return -EINVAL;
+
+ pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
+
+ freqs.old = at32_get_speed(0);
+ freqs.new = (freq + 500) / 1000;
+ freqs.flags = 0;
+
+ if (!ref_freq) {
+ ref_freq = freqs.old;
+ loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy;
+ }
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+ if (freqs.old < freqs.new)
+ boot_cpu_data.loops_per_jiffy = cpufreq_scale(
+ loops_per_jiffy_ref, ref_freq, freqs.new);
+ clk_set_rate(cpuclk, freq);
+ if (freqs.new < freqs.old)
+ boot_cpu_data.loops_per_jiffy = cpufreq_scale(
+ loops_per_jiffy_ref, ref_freq, freqs.new);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ pr_debug("cpufreq: set frequency %lu Hz\n", freq);
+
+ return 0;
+}
+
+static int __init at32_cpufreq_driver_init(struct cpufreq_policy *policy)
+{
+ if (policy->cpu != 0)
+ return -EINVAL;
+
+ cpuclk = clk_get(NULL, "cpu");
+ if (IS_ERR(cpuclk)) {
+ pr_debug("cpufreq: could not get CPU clk\n");
+ return PTR_ERR(cpuclk);
+ }
+
+ policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000;
+ policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
+ policy->cpuinfo.transition_latency = 0;
+ policy->cur = at32_get_speed(0);
+ policy->min = policy->cpuinfo.min_freq;
+ policy->max = policy->cpuinfo.max_freq;
+
+ printk("cpufreq: AT32AP CPU frequency driver\n");
+
+ return 0;
+}
+
+static struct cpufreq_driver at32_driver = {
+ .name = "at32ap",
+ .owner = THIS_MODULE,
+ .init = at32_cpufreq_driver_init,
+ .verify = at32_verify_speed,
+ .target = at32_set_target,
+ .get = at32_get_speed,
+ .flags = CPUFREQ_STICKY,
+};
+
+static int __init at32_cpufreq_init(void)
+{
+ return cpufreq_register_driver(&at32_driver);
+}
+late_initcall(at32_cpufreq_init);
diff --git a/drivers/cpufreq/blackfin-cpufreq.c b/drivers/cpufreq/blackfin-cpufreq.c
new file mode 100644
index 000000000000..995511e80bef
--- /dev/null
+++ b/drivers/cpufreq/blackfin-cpufreq.c
@@ -0,0 +1,247 @@
+/*
+ * Blackfin core clock scaling
+ *
+ * Copyright 2008-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+#include <asm/blackfin.h>
+#include <asm/time.h>
+#include <asm/dpmc.h>
+
+
+/* this is the table of CCLK frequencies, in Hz */
+/* .index is the entry in the auxiliary dpm_state_table[] */
+static struct cpufreq_frequency_table bfin_freq_table[] = {
+ {
+ .frequency = CPUFREQ_TABLE_END,
+ .index = 0,
+ },
+ {
+ .frequency = CPUFREQ_TABLE_END,
+ .index = 1,
+ },
+ {
+ .frequency = CPUFREQ_TABLE_END,
+ .index = 2,
+ },
+ {
+ .frequency = CPUFREQ_TABLE_END,
+ .index = 0,
+ },
+};
+
+static struct bfin_dpm_state {
+ unsigned int csel; /* system clock divider */
+ unsigned int tscale; /* change the divider on the core timer interrupt */
+} dpm_state_table[3];
+
+#if defined(CONFIG_CYCLES_CLOCKSOURCE)
+/*
+ * normalized to maximum frequency offset for CYCLES,
+ * used in time-ts cycles clock source, but could be used
+ * somewhere also.
+ */
+unsigned long long __bfin_cycles_off;
+unsigned int __bfin_cycles_mod;
+#endif
+
+/**************************************************************************/
+static void __init bfin_init_tables(unsigned long cclk, unsigned long sclk)
+{
+
+ unsigned long csel, min_cclk;
+ int index;
+
+ /* Anomaly 273 seems to still exist on non-BF54x w/dcache turned on */
+#if ANOMALY_05000273 || ANOMALY_05000274 || \
+ (!(defined(CONFIG_BF54x) || defined(CONFIG_BF60x)) \
+ && defined(CONFIG_BFIN_EXTMEM_DCACHEABLE))
+ min_cclk = sclk * 2;
+#else
+ min_cclk = sclk;
+#endif
+
+#ifndef CONFIG_BF60x
+ csel = ((bfin_read_PLL_DIV() & CSEL) >> 4);
+#else
+ csel = bfin_read32(CGU0_DIV) & 0x1F;
+#endif
+
+ for (index = 0; (cclk >> index) >= min_cclk && csel <= 3 && index < 3; index++, csel++) {
+ bfin_freq_table[index].frequency = cclk >> index;
+#ifndef CONFIG_BF60x
+ dpm_state_table[index].csel = csel << 4; /* Shift now into PLL_DIV bitpos */
+#else
+ dpm_state_table[index].csel = csel;
+#endif
+ dpm_state_table[index].tscale = (TIME_SCALE >> index) - 1;
+
+ pr_debug("cpufreq: freq:%d csel:0x%x tscale:%d\n",
+ bfin_freq_table[index].frequency,
+ dpm_state_table[index].csel,
+ dpm_state_table[index].tscale);
+ }
+ return;
+}
+
+static void bfin_adjust_core_timer(void *info)
+{
+ unsigned int tscale;
+ unsigned int index = *(unsigned int *)info;
+
+ /* we have to adjust the core timer, because it is using cclk */
+ tscale = dpm_state_table[index].tscale;
+ bfin_write_TSCALE(tscale);
+ return;
+}
+
+static unsigned int bfin_getfreq_khz(unsigned int cpu)
+{
+ /* Both CoreA/B have the same core clock */
+ return get_cclk() / 1000;
+}
+
+#ifdef CONFIG_BF60x
+unsigned long cpu_set_cclk(int cpu, unsigned long new)
+{
+ struct clk *clk;
+ int ret;
+
+ clk = clk_get(NULL, "CCLK");
+ if (IS_ERR(clk))
+ return -ENODEV;
+
+ ret = clk_set_rate(clk, new);
+ clk_put(clk);
+ return ret;
+}
+#endif
+
+static int bfin_target(struct cpufreq_policy *policy,
+ unsigned int target_freq, unsigned int relation)
+{
+#ifndef CONFIG_BF60x
+ unsigned int plldiv;
+#endif
+ unsigned int index;
+ unsigned long cclk_hz;
+ struct cpufreq_freqs freqs;
+ static unsigned long lpj_ref;
+ static unsigned int lpj_ref_freq;
+ int ret = 0;
+
+#if defined(CONFIG_CYCLES_CLOCKSOURCE)
+ cycles_t cycles;
+#endif
+
+ if (cpufreq_frequency_table_target(policy, bfin_freq_table, target_freq,
+ relation, &index))
+ return -EINVAL;
+
+ cclk_hz = bfin_freq_table[index].frequency;
+
+ freqs.old = bfin_getfreq_khz(0);
+ freqs.new = cclk_hz;
+
+ pr_debug("cpufreq: changing cclk to %lu; target = %u, oldfreq = %u\n",
+ cclk_hz, target_freq, freqs.old);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+#ifndef CONFIG_BF60x
+ plldiv = (bfin_read_PLL_DIV() & SSEL) | dpm_state_table[index].csel;
+ bfin_write_PLL_DIV(plldiv);
+#else
+ ret = cpu_set_cclk(policy->cpu, freqs.new * 1000);
+ if (ret != 0) {
+ WARN_ONCE(ret, "cpufreq set freq failed %d\n", ret);
+ return ret;
+ }
+#endif
+ on_each_cpu(bfin_adjust_core_timer, &index, 1);
+#if defined(CONFIG_CYCLES_CLOCKSOURCE)
+ cycles = get_cycles();
+ SSYNC();
+ cycles += 10; /* ~10 cycles we lose after get_cycles() */
+ __bfin_cycles_off += (cycles << __bfin_cycles_mod) - (cycles << index);
+ __bfin_cycles_mod = index;
+#endif
+ if (!lpj_ref_freq) {
+ lpj_ref = loops_per_jiffy;
+ lpj_ref_freq = freqs.old;
+ }
+ if (freqs.new != freqs.old) {
+ loops_per_jiffy = cpufreq_scale(lpj_ref,
+ lpj_ref_freq, freqs.new);
+ }
+
+ /* TODO: just test case for cycles clock source, remove later */
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ pr_debug("cpufreq: done\n");
+ return ret;
+}
+
+static int bfin_verify_speed(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, bfin_freq_table);
+}
+
+static int __bfin_cpu_init(struct cpufreq_policy *policy)
+{
+
+ unsigned long cclk, sclk;
+
+ cclk = get_cclk() / 1000;
+ sclk = get_sclk() / 1000;
+
+ if (policy->cpu == CPUFREQ_CPU)
+ bfin_init_tables(cclk, sclk);
+
+ policy->cpuinfo.transition_latency = 50000; /* 50us assumed */
+
+ policy->cur = cclk;
+ cpufreq_frequency_table_get_attr(bfin_freq_table, policy->cpu);
+ return cpufreq_frequency_table_cpuinfo(policy, bfin_freq_table);
+}
+
+static struct freq_attr *bfin_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver bfin_driver = {
+ .verify = bfin_verify_speed,
+ .target = bfin_target,
+ .get = bfin_getfreq_khz,
+ .init = __bfin_cpu_init,
+ .name = "bfin cpufreq",
+ .owner = THIS_MODULE,
+ .attr = bfin_freq_attr,
+};
+
+static int __init bfin_cpu_init(void)
+{
+ return cpufreq_register_driver(&bfin_driver);
+}
+
+static void __exit bfin_cpu_exit(void)
+{
+ cpufreq_unregister_driver(&bfin_driver);
+}
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("cpufreq driver for Blackfin");
+MODULE_LICENSE("GPL");
+
+module_init(bfin_cpu_init);
+module_exit(bfin_cpu_exit);
diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index 37d23a0f8c56..3ab8294eab04 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -44,8 +44,9 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
{
struct cpufreq_freqs freqs;
struct opp *opp;
- unsigned long freq_Hz, volt = 0, volt_old = 0, tol = 0;
- unsigned int index, cpu;
+ unsigned long volt = 0, volt_old = 0, tol = 0;
+ long freq_Hz;
+ unsigned int index;
int ret;
ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
@@ -65,10 +66,7 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
if (freqs.old == freqs.new)
return 0;
- for_each_online_cpu(cpu) {
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
if (cpu_reg) {
rcu_read_lock();
@@ -76,7 +74,9 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("failed to find OPP for %ld\n", freq_Hz);
- return PTR_ERR(opp);
+ freqs.new = freqs.old;
+ ret = PTR_ERR(opp);
+ goto post_notify;
}
volt = opp_get_voltage(opp);
rcu_read_unlock();
@@ -94,7 +94,7 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
if (ret) {
pr_err("failed to scale voltage up: %d\n", ret);
freqs.new = freqs.old;
- return ret;
+ goto post_notify;
}
}
@@ -103,7 +103,8 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
pr_err("failed to set clock rate: %d\n", ret);
if (cpu_reg)
regulator_set_voltage_tol(cpu_reg, volt_old, tol);
- return ret;
+ freqs.new = freqs.old;
+ goto post_notify;
}
/* scaling down? scale voltage after frequency */
@@ -113,25 +114,19 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
pr_err("failed to scale voltage down: %d\n", ret);
clk_set_rate(cpu_clk, freqs.old * 1000);
freqs.new = freqs.old;
- return ret;
}
}
- for_each_online_cpu(cpu) {
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+post_notify:
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
- return 0;
+ return ret;
}
static int cpu0_cpufreq_init(struct cpufreq_policy *policy)
{
int ret;
- if (policy->cpu != 0)
- return -EINVAL;
-
ret = cpufreq_frequency_table_cpuinfo(policy, freq_table);
if (ret) {
pr_err("invalid frequency table: %d\n", ret);
@@ -262,6 +257,7 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
}
of_node_put(np);
+ of_node_put(parent);
return 0;
out_free_table:
diff --git a/drivers/cpufreq/cpufreq-nforce2.c b/drivers/cpufreq/cpufreq-nforce2.c
index 13d311ee08b3..af1542d41440 100644
--- a/drivers/cpufreq/cpufreq-nforce2.c
+++ b/drivers/cpufreq/cpufreq-nforce2.c
@@ -263,7 +263,6 @@ static int nforce2_target(struct cpufreq_policy *policy,
freqs.old = nforce2_get(policy->cpu);
freqs.new = target_fsb * fid * 100;
- freqs.cpu = 0; /* Only one CPU on nForce2 platforms */
if (freqs.old == freqs.new)
return 0;
@@ -271,7 +270,7 @@ static int nforce2_target(struct cpufreq_policy *policy,
pr_debug("Old CPU frequency %d kHz, new %d kHz\n",
freqs.old, freqs.new);
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Disable IRQs */
/* local_irq_save(flags); */
@@ -286,7 +285,7 @@ static int nforce2_target(struct cpufreq_policy *policy,
/* Enable IRQs */
/* local_irq_restore(flags); */
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
@@ -360,12 +359,10 @@ static int nforce2_cpu_init(struct cpufreq_policy *policy)
min_fsb = NFORCE2_MIN_FSB;
/* cpuinfo and default policy values */
- policy->cpuinfo.min_freq = min_fsb * fid * 100;
- policy->cpuinfo.max_freq = max_fsb * fid * 100;
+ policy->min = policy->cpuinfo.min_freq = min_fsb * fid * 100;
+ policy->max = policy->cpuinfo.max_freq = max_fsb * fid * 100;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cur = nforce2_get(policy->cpu);
- policy->min = policy->cpuinfo.min_freq;
- policy->max = policy->cpuinfo.max_freq;
return 0;
}
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b02824d092e7..a6f65954b0ab 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -39,13 +39,13 @@
* level driver of CPUFreq support, and its spinlock. This lock
* also protects the cpufreq_cpu_data array.
*/
-static struct cpufreq_driver *cpufreq_driver;
+static struct cpufreq_driver __rcu *cpufreq_driver;
static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
#ifdef CONFIG_HOTPLUG_CPU
/* This one keeps track of the previously set governor of a removed CPU */
static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor);
#endif
-static DEFINE_SPINLOCK(cpufreq_driver_lock);
+static DEFINE_RWLOCK(cpufreq_driver_lock);
/*
* cpu_policy_rwsem is a per CPU reader-writer semaphore designed to cure
@@ -128,23 +128,36 @@ void disable_cpufreq(void)
static LIST_HEAD(cpufreq_governor_list);
static DEFINE_MUTEX(cpufreq_governor_mutex);
+bool have_governor_per_policy(void)
+{
+ bool have_governor_per_policy;
+ rcu_read_lock();
+ have_governor_per_policy =
+ rcu_dereference(cpufreq_driver)->have_governor_per_policy;
+ rcu_read_unlock();
+ return have_governor_per_policy;
+}
+
static struct cpufreq_policy *__cpufreq_cpu_get(unsigned int cpu, bool sysfs)
{
struct cpufreq_policy *data;
+ struct cpufreq_driver *driver;
unsigned long flags;
if (cpu >= nr_cpu_ids)
goto err_out;
/* get the cpufreq driver */
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
- if (!cpufreq_driver)
+ if (!driver)
goto err_out_unlock;
- if (!try_module_get(cpufreq_driver->owner))
+ if (!try_module_get(driver->owner))
goto err_out_unlock;
+ read_lock_irqsave(&cpufreq_driver_lock, flags);
/* get the CPU */
data = per_cpu(cpufreq_cpu_data, cpu);
@@ -155,13 +168,15 @@ static struct cpufreq_policy *__cpufreq_cpu_get(unsigned int cpu, bool sysfs)
if (!sysfs && !kobject_get(&data->kobj))
goto err_out_put_module;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ read_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ rcu_read_unlock();
return data;
err_out_put_module:
- module_put(cpufreq_driver->owner);
+ module_put(driver->owner);
+ read_unlock_irqrestore(&cpufreq_driver_lock, flags);
err_out_unlock:
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ rcu_read_unlock();
err_out:
return NULL;
}
@@ -184,7 +199,9 @@ static void __cpufreq_cpu_put(struct cpufreq_policy *data, bool sysfs)
{
if (!sysfs)
kobject_put(&data->kobj);
- module_put(cpufreq_driver->owner);
+ rcu_read_lock();
+ module_put(rcu_dereference(cpufreq_driver)->owner);
+ rcu_read_unlock();
}
void cpufreq_cpu_put(struct cpufreq_policy *data)
@@ -244,32 +261,20 @@ static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
#endif
-/**
- * cpufreq_notify_transition - call notifier chain and adjust_jiffies
- * on frequency transition.
- *
- * This function calls the transition notifiers and the "adjust_jiffies"
- * function. It is called twice on all CPU frequency changes that have
- * external effects.
- */
-void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
+void __cpufreq_notify_transition(struct cpufreq_policy *policy,
+ struct cpufreq_freqs *freqs, unsigned int state)
{
- struct cpufreq_policy *policy;
- unsigned long flags;
-
BUG_ON(irqs_disabled());
if (cpufreq_disabled())
return;
- freqs->flags = cpufreq_driver->flags;
+ rcu_read_lock();
+ freqs->flags = rcu_dereference(cpufreq_driver)->flags;
+ rcu_read_unlock();
pr_debug("notification %u of frequency transition to %u kHz\n",
state, freqs->new);
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
- policy = per_cpu(cpufreq_cpu_data, freqs->cpu);
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
switch (state) {
case CPUFREQ_PRECHANGE:
@@ -277,7 +282,7 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
* which is not equal to what the cpufreq core thinks is
* "old frequency".
*/
- if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
+ if (!(freqs->flags & CPUFREQ_CONST_LOOPS)) {
if ((policy) && (policy->cpu == freqs->cpu) &&
(policy->cur) && (policy->cur != freqs->old)) {
pr_debug("Warning: CPU frequency is"
@@ -303,6 +308,20 @@ void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
break;
}
}
+/**
+ * cpufreq_notify_transition - call notifier chain and adjust_jiffies
+ * on frequency transition.
+ *
+ * This function calls the transition notifiers and the "adjust_jiffies"
+ * function. It is called twice on all CPU frequency changes that have
+ * external effects.
+ */
+void cpufreq_notify_transition(struct cpufreq_policy *policy,
+ struct cpufreq_freqs *freqs, unsigned int state)
+{
+ for_each_cpu(freqs->cpu, policy->cpus)
+ __cpufreq_notify_transition(policy, freqs, state);
+}
EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
@@ -329,11 +348,21 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
struct cpufreq_governor **governor)
{
int err = -EINVAL;
-
- if (!cpufreq_driver)
+ struct cpufreq_driver *driver;
+ bool has_setpolicy;
+ bool has_target;
+
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ if (!driver) {
+ rcu_read_unlock();
goto out;
+ }
+ has_setpolicy = driver->setpolicy ? true : false;
+ has_target = driver->target ? true : false;
+ rcu_read_unlock();
- if (cpufreq_driver->setpolicy) {
+ if (has_setpolicy) {
if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
*policy = CPUFREQ_POLICY_PERFORMANCE;
err = 0;
@@ -342,7 +371,7 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy,
*policy = CPUFREQ_POLICY_POWERSAVE;
err = 0;
}
- } else if (cpufreq_driver->target) {
+ } else if (has_target) {
struct cpufreq_governor *t;
mutex_lock(&cpufreq_governor_mutex);
@@ -493,7 +522,12 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
*/
static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
{
- return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
+ ssize_t size;
+ rcu_read_lock();
+ size = scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
+ rcu_dereference(cpufreq_driver)->name);
+ rcu_read_unlock();
+ return size;
}
/**
@@ -505,10 +539,13 @@ static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
ssize_t i = 0;
struct cpufreq_governor *t;
- if (!cpufreq_driver->target) {
+ rcu_read_lock();
+ if (!rcu_dereference(cpufreq_driver)->target) {
+ rcu_read_unlock();
i += sprintf(buf, "performance powersave");
goto out;
}
+ rcu_read_unlock();
list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
@@ -586,9 +623,15 @@ static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
{
unsigned int limit;
+ int (*bios_limit)(int cpu, unsigned int *limit);
int ret;
- if (cpufreq_driver->bios_limit) {
- ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
+
+ rcu_read_lock();
+ bios_limit = rcu_dereference(cpufreq_driver)->bios_limit;
+ rcu_read_unlock();
+
+ if (bios_limit) {
+ ret = bios_limit(policy->cpu, &limit);
if (!ret)
return sprintf(buf, "%u\n", limit);
}
@@ -731,6 +774,7 @@ static int cpufreq_add_dev_interface(unsigned int cpu,
{
struct cpufreq_policy new_policy;
struct freq_attr **drv_attr;
+ struct cpufreq_driver *driver;
unsigned long flags;
int ret = 0;
unsigned int j;
@@ -742,35 +786,38 @@ static int cpufreq_add_dev_interface(unsigned int cpu,
return ret;
/* set up files for this cpu device */
- drv_attr = cpufreq_driver->attr;
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ drv_attr = driver->attr;
while ((drv_attr) && (*drv_attr)) {
ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
if (ret)
- goto err_out_kobj_put;
+ goto err_out_unlock;
drv_attr++;
}
- if (cpufreq_driver->get) {
+ if (driver->get) {
ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
if (ret)
- goto err_out_kobj_put;
+ goto err_out_unlock;
}
- if (cpufreq_driver->target) {
+ if (driver->target) {
ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
if (ret)
- goto err_out_kobj_put;
+ goto err_out_unlock;
}
- if (cpufreq_driver->bios_limit) {
+ if (driver->bios_limit) {
ret = sysfs_create_file(&policy->kobj, &bios_limit.attr);
if (ret)
- goto err_out_kobj_put;
+ goto err_out_unlock;
}
+ rcu_read_unlock();
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu(j, policy->cpus) {
per_cpu(cpufreq_cpu_data, j) = policy;
per_cpu(cpufreq_policy_cpu, j) = policy->cpu;
}
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
ret = cpufreq_add_dev_symlink(cpu, policy);
if (ret)
@@ -786,12 +833,20 @@ static int cpufreq_add_dev_interface(unsigned int cpu,
policy->user_policy.governor = policy->governor;
if (ret) {
+ int (*exit)(struct cpufreq_policy *policy);
+
pr_debug("setting policy failed\n");
- if (cpufreq_driver->exit)
- cpufreq_driver->exit(policy);
+ rcu_read_lock();
+ exit = rcu_dereference(cpufreq_driver)->exit;
+ rcu_read_unlock();
+ if (exit)
+ exit(policy);
+
}
return ret;
+err_out_unlock:
+ rcu_read_unlock();
err_out_kobj_put:
kobject_put(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
@@ -803,27 +858,34 @@ static int cpufreq_add_policy_cpu(unsigned int cpu, unsigned int sibling,
struct device *dev)
{
struct cpufreq_policy *policy;
- int ret = 0;
+ int ret = 0, has_target = 0;
unsigned long flags;
policy = cpufreq_cpu_get(sibling);
WARN_ON(!policy);
- __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
+ rcu_read_lock();
+ has_target = !!rcu_dereference(cpufreq_driver)->target;
+ rcu_read_unlock();
+
+ if (has_target)
+ __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
lock_policy_rwsem_write(sibling);
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_set_cpu(cpu, policy->cpus);
per_cpu(cpufreq_policy_cpu, cpu) = policy->cpu;
per_cpu(cpufreq_cpu_data, cpu) = policy;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
unlock_policy_rwsem_write(sibling);
- __cpufreq_governor(policy, CPUFREQ_GOV_START);
- __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+ if (has_target) {
+ __cpufreq_governor(policy, CPUFREQ_GOV_START);
+ __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+ }
ret = sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq");
if (ret) {
@@ -849,6 +911,8 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
unsigned int j, cpu = dev->id;
int ret = -ENOMEM;
struct cpufreq_policy *policy;
+ struct cpufreq_driver *driver;
+ int (*init)(struct cpufreq_policy *policy);
unsigned long flags;
#ifdef CONFIG_HOTPLUG_CPU
struct cpufreq_governor *gov;
@@ -871,22 +935,27 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
#ifdef CONFIG_HOTPLUG_CPU
/* Check if this cpu was hot-unplugged earlier and has siblings */
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ read_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_online_cpu(sibling) {
struct cpufreq_policy *cp = per_cpu(cpufreq_cpu_data, sibling);
if (cp && cpumask_test_cpu(cpu, cp->related_cpus)) {
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ read_unlock_irqrestore(&cpufreq_driver_lock, flags);
return cpufreq_add_policy_cpu(cpu, sibling, dev);
}
}
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ read_unlock_irqrestore(&cpufreq_driver_lock, flags);
#endif
#endif
- if (!try_module_get(cpufreq_driver->owner)) {
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ if (!try_module_get(driver->owner)) {
+ rcu_read_unlock();
ret = -EINVAL;
goto module_out;
}
+ init = driver->init;
+ rcu_read_unlock();
policy = kzalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
if (!policy)
@@ -911,7 +980,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
/* call driver. From then on the cpufreq must be able
* to accept all calls to ->verify and ->setpolicy for this CPU
*/
- ret = cpufreq_driver->init(policy);
+ ret = init(policy);
if (ret) {
pr_debug("initialization failed\n");
goto err_set_policy_cpu;
@@ -946,16 +1015,18 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
goto err_out_unregister;
kobject_uevent(&policy->kobj, KOBJ_ADD);
- module_put(cpufreq_driver->owner);
+ rcu_read_lock();
+ module_put(rcu_dereference(cpufreq_driver)->owner);
+ rcu_read_unlock();
pr_debug("initialization complete\n");
return 0;
err_out_unregister:
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
for_each_cpu(j, policy->cpus)
per_cpu(cpufreq_cpu_data, j) = NULL;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
kobject_put(&policy->kobj);
wait_for_completion(&policy->kobj_unregister);
@@ -968,7 +1039,9 @@ err_free_cpumask:
err_free_policy:
kfree(policy);
nomem_out:
- module_put(cpufreq_driver->owner);
+ rcu_read_lock();
+ module_put(rcu_dereference(cpufreq_driver)->owner);
+ rcu_read_unlock();
module_out:
return ret;
}
@@ -1002,36 +1075,46 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
unsigned int cpu = dev->id, ret, cpus;
unsigned long flags;
struct cpufreq_policy *data;
+ struct cpufreq_driver *driver;
struct kobject *kobj;
struct completion *cmp;
struct device *cpu_dev;
+ bool has_target;
+ int (*exit)(struct cpufreq_policy *policy);
pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
data = per_cpu(cpufreq_cpu_data, cpu);
per_cpu(cpufreq_cpu_data, cpu) = NULL;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
if (!data) {
pr_debug("%s: No cpu_data found\n", __func__);
return -EINVAL;
}
- if (cpufreq_driver->target)
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ has_target = driver->target ? true : false;
+ exit = driver->exit;
+ if (has_target)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
#ifdef CONFIG_HOTPLUG_CPU
- if (!cpufreq_driver->setpolicy)
+ if (!driver->setpolicy)
strncpy(per_cpu(cpufreq_cpu_governor, cpu),
data->governor->name, CPUFREQ_NAME_LEN);
#endif
+ rcu_read_unlock();
WARN_ON(lock_policy_rwsem_write(cpu));
cpus = cpumask_weight(data->cpus);
- cpumask_clear_cpu(cpu, data->cpus);
+
+ if (cpus > 1)
+ cpumask_clear_cpu(cpu, data->cpus);
unlock_policy_rwsem_write(cpu);
if (cpu != data->cpu) {
@@ -1047,9 +1130,9 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
WARN_ON(lock_policy_rwsem_write(cpu));
cpumask_set_cpu(cpu, data->cpus);
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
per_cpu(cpufreq_cpu_data, cpu) = data;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
unlock_policy_rwsem_write(cpu);
@@ -1070,6 +1153,9 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
/* If cpu is last user of policy, free policy */
if (cpus == 1) {
+ if (has_target)
+ __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
+
lock_policy_rwsem_read(cpu);
kobj = &data->kobj;
cmp = &data->kobj_unregister;
@@ -1084,13 +1170,13 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
wait_for_completion(cmp);
pr_debug("wait complete\n");
- if (cpufreq_driver->exit)
- cpufreq_driver->exit(data);
+ if (exit)
+ exit(data);
free_cpumask_var(data->related_cpus);
free_cpumask_var(data->cpus);
kfree(data);
- } else if (cpufreq_driver->target) {
+ } else if (has_target) {
__cpufreq_governor(data, CPUFREQ_GOV_START);
__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
}
@@ -1134,16 +1220,23 @@ static void handle_update(struct work_struct *work)
static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq,
unsigned int new_freq)
{
+ struct cpufreq_policy *policy;
struct cpufreq_freqs freqs;
+ unsigned long flags;
+
pr_debug("Warning: CPU frequency out of sync: cpufreq and timing "
"core thinks of %u, is %u kHz.\n", old_freq, new_freq);
- freqs.cpu = cpu;
freqs.old = old_freq;
freqs.new = new_freq;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+ read_lock_irqsave(&cpufreq_driver_lock, flags);
+ policy = per_cpu(cpufreq_cpu_data, cpu);
+ read_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
}
@@ -1157,10 +1250,18 @@ static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq,
unsigned int cpufreq_quick_get(unsigned int cpu)
{
struct cpufreq_policy *policy;
+ struct cpufreq_driver *driver;
+ unsigned int (*get)(unsigned int cpu);
unsigned int ret_freq = 0;
- if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get)
- return cpufreq_driver->get(cpu);
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ if (driver && driver->setpolicy && driver->get) {
+ get = driver->get;
+ rcu_read_unlock();
+ return get(cpu);
+ }
+ rcu_read_unlock();
policy = cpufreq_cpu_get(cpu);
if (policy) {
@@ -1196,15 +1297,26 @@ EXPORT_SYMBOL(cpufreq_quick_get_max);
static unsigned int __cpufreq_get(unsigned int cpu)
{
struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
+ struct cpufreq_driver *driver;
+ unsigned int (*get)(unsigned int cpu);
unsigned int ret_freq = 0;
+ u8 flags;
+
- if (!cpufreq_driver->get)
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ if (!driver->get) {
+ rcu_read_unlock();
return ret_freq;
+ }
+ flags = driver->flags;
+ get = driver->get;
+ rcu_read_unlock();
- ret_freq = cpufreq_driver->get(cpu);
+ ret_freq = get(cpu);
if (ret_freq && policy->cur &&
- !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
+ !(flags & CPUFREQ_CONST_LOOPS)) {
/* verify no discrepancy between actual and
saved value exists */
if (unlikely(ret_freq != policy->cur)) {
@@ -1260,6 +1372,7 @@ static struct subsys_interface cpufreq_interface = {
*/
static int cpufreq_bp_suspend(void)
{
+ int (*suspend)(struct cpufreq_policy *policy);
int ret = 0;
int cpu = smp_processor_id();
@@ -1272,8 +1385,11 @@ static int cpufreq_bp_suspend(void)
if (!cpu_policy)
return 0;
- if (cpufreq_driver->suspend) {
- ret = cpufreq_driver->suspend(cpu_policy);
+ rcu_read_lock();
+ suspend = rcu_dereference(cpufreq_driver)->suspend;
+ rcu_read_unlock();
+ if (suspend) {
+ ret = suspend(cpu_policy);
if (ret)
printk(KERN_ERR "cpufreq: suspend failed in ->suspend "
"step on CPU %u\n", cpu_policy->cpu);
@@ -1299,6 +1415,7 @@ static int cpufreq_bp_suspend(void)
static void cpufreq_bp_resume(void)
{
int ret = 0;
+ int (*resume)(struct cpufreq_policy *policy);
int cpu = smp_processor_id();
struct cpufreq_policy *cpu_policy;
@@ -1310,8 +1427,12 @@ static void cpufreq_bp_resume(void)
if (!cpu_policy)
return;
- if (cpufreq_driver->resume) {
- ret = cpufreq_driver->resume(cpu_policy);
+ rcu_read_lock();
+ resume = rcu_dereference(cpufreq_driver)->resume;
+ rcu_read_unlock();
+
+ if (resume) {
+ ret = resume(cpu_policy);
if (ret) {
printk(KERN_ERR "cpufreq: resume failed in ->resume "
"step on CPU %u\n", cpu_policy->cpu);
@@ -1338,10 +1459,14 @@ static struct syscore_ops cpufreq_syscore_ops = {
*/
const char *cpufreq_get_current_driver(void)
{
- if (cpufreq_driver)
- return cpufreq_driver->name;
-
- return NULL;
+ struct cpufreq_driver *driver;
+ const char *name = NULL;
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ if (driver)
+ name = driver->name;
+ rcu_read_unlock();
+ return name;
}
EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);
@@ -1435,6 +1560,9 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
{
int retval = -EINVAL;
unsigned int old_target_freq = target_freq;
+ int (*target)(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation);
if (cpufreq_disabled())
return -ENODEV;
@@ -1451,8 +1579,11 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
if (target_freq == policy->cur)
return 0;
- if (cpufreq_driver->target)
- retval = cpufreq_driver->target(policy, target_freq, relation);
+ rcu_read_lock();
+ target = rcu_dereference(cpufreq_driver)->target;
+ rcu_read_unlock();
+ if (target)
+ retval = target(policy, target_freq, relation);
return retval;
}
@@ -1485,18 +1616,24 @@ EXPORT_SYMBOL_GPL(cpufreq_driver_target);
int __cpufreq_driver_getavg(struct cpufreq_policy *policy, unsigned int cpu)
{
int ret = 0;
+ unsigned int (*getavg)(struct cpufreq_policy *policy,
+ unsigned int cpu);
if (cpufreq_disabled())
return ret;
- if (!cpufreq_driver->getavg)
+ rcu_read_lock();
+ getavg = rcu_dereference(cpufreq_driver)->getavg;
+ rcu_read_unlock();
+
+ if (!getavg)
return 0;
policy = cpufreq_cpu_get(policy->cpu);
if (!policy)
return -EINVAL;
- ret = cpufreq_driver->getavg(policy, cpu);
+ ret = getavg(policy, cpu);
cpufreq_cpu_put(policy);
return ret;
@@ -1544,10 +1681,12 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
policy->cpu, event);
ret = policy->governor->governor(policy, event);
- if (event == CPUFREQ_GOV_START)
- policy->governor->initialized++;
- else if (event == CPUFREQ_GOV_STOP)
- policy->governor->initialized--;
+ if (!ret) {
+ if (event == CPUFREQ_GOV_POLICY_INIT)
+ policy->governor->initialized++;
+ else if (event == CPUFREQ_GOV_POLICY_EXIT)
+ policy->governor->initialized--;
+ }
/* we keep one module reference alive for
each CPU governed by this CPU */
@@ -1651,7 +1790,10 @@ EXPORT_SYMBOL(cpufreq_get_policy);
static int __cpufreq_set_policy(struct cpufreq_policy *data,
struct cpufreq_policy *policy)
{
- int ret = 0;
+ int ret = 0, failed = 1;
+ struct cpufreq_driver *driver;
+ int (*verify)(struct cpufreq_policy *policy);
+ int (*setpolicy)(struct cpufreq_policy *policy);
pr_debug("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
policy->min, policy->max);
@@ -1665,7 +1807,13 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
}
/* verify the cpu speed can be set within this limit */
- ret = cpufreq_driver->verify(policy);
+ rcu_read_lock();
+ driver = rcu_dereference(cpufreq_driver);
+ verify = driver->verify;
+ setpolicy = driver->setpolicy;
+ rcu_read_unlock();
+
+ ret = verify(policy);
if (ret)
goto error_out;
@@ -1679,7 +1827,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
/* verify the cpu speed can be set within this limit,
which might be different to the first one */
- ret = cpufreq_driver->verify(policy);
+ ret = verify(policy);
if (ret)
goto error_out;
@@ -1693,10 +1841,10 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
pr_debug("new min and max freqs are %u - %u kHz\n",
data->min, data->max);
- if (cpufreq_driver->setpolicy) {
+ if (setpolicy) {
data->policy = policy->policy;
pr_debug("setting range\n");
- ret = cpufreq_driver->setpolicy(policy);
+ ret = setpolicy(policy);
} else {
if (policy->governor != data->governor) {
/* save old, working values */
@@ -1705,18 +1853,31 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
pr_debug("governor switch\n");
/* end old governor */
- if (data->governor)
+ if (data->governor) {
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
+ __cpufreq_governor(data,
+ CPUFREQ_GOV_POLICY_EXIT);
+ }
/* start new governor */
data->governor = policy->governor;
- if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
+ if (!__cpufreq_governor(data, CPUFREQ_GOV_POLICY_INIT)) {
+ if (!__cpufreq_governor(data, CPUFREQ_GOV_START))
+ failed = 0;
+ else
+ __cpufreq_governor(data,
+ CPUFREQ_GOV_POLICY_EXIT);
+ }
+
+ if (failed) {
/* new governor failed, so re-start old one */
pr_debug("starting governor %s failed\n",
data->governor->name);
if (old_gov) {
data->governor = old_gov;
__cpufreq_governor(data,
+ CPUFREQ_GOV_POLICY_INIT);
+ __cpufreq_governor(data,
CPUFREQ_GOV_START);
}
ret = -EINVAL;
@@ -1743,6 +1904,11 @@ int cpufreq_update_policy(unsigned int cpu)
{
struct cpufreq_policy *data = cpufreq_cpu_get(cpu);
struct cpufreq_policy policy;
+ struct cpufreq_driver *driver;
+ unsigned int (*get)(unsigned int cpu);
+ int (*target)(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation);
int ret;
if (!data) {
@@ -1764,13 +1930,18 @@ int cpufreq_update_policy(unsigned int cpu)
/* BIOS might change freq behind our back
-> ask driver for current freq and notify governors about a change */
- if (cpufreq_driver->get) {
- policy.cur = cpufreq_driver->get(cpu);
+ rcu_read_lock();
+ driver = rcu_access_pointer(cpufreq_driver);
+ get = driver->get;
+ target = driver->target;
+ rcu_read_unlock();
+ if (get) {
+ policy.cur = get(cpu);
if (!data->cur) {
pr_debug("Driver did not initialize current freq");
data->cur = policy.cur;
} else {
- if (data->cur != policy.cur && cpufreq_driver->target)
+ if (data->cur != policy.cur && target)
cpufreq_out_of_sync(cpu, data->cur,
policy.cur);
}
@@ -1848,19 +2019,20 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
if (driver_data->setpolicy)
driver_data->flags |= CPUFREQ_CONST_LOOPS;
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
- if (cpufreq_driver) {
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ if (rcu_access_pointer(cpufreq_driver)) {
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
return -EBUSY;
}
- cpufreq_driver = driver_data;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ rcu_assign_pointer(cpufreq_driver, driver_data);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ synchronize_rcu();
ret = subsys_interface_register(&cpufreq_interface);
if (ret)
goto err_null_driver;
- if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) {
+ if (!(driver_data->flags & CPUFREQ_STICKY)) {
int i;
ret = -ENODEV;
@@ -1886,9 +2058,10 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
err_if_unreg:
subsys_interface_unregister(&cpufreq_interface);
err_null_driver:
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver = NULL;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ rcu_assign_pointer(cpufreq_driver, NULL);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ synchronize_rcu();
return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_register_driver);
@@ -1905,18 +2078,25 @@ EXPORT_SYMBOL_GPL(cpufreq_register_driver);
int cpufreq_unregister_driver(struct cpufreq_driver *driver)
{
unsigned long flags;
+ struct cpufreq_driver *old_driver;
- if (!cpufreq_driver || (driver != cpufreq_driver))
+ rcu_read_lock();
+ old_driver = rcu_access_pointer(cpufreq_driver);
+ if (!old_driver || (driver != old_driver)) {
+ rcu_read_unlock();
return -EINVAL;
+ }
+ rcu_read_unlock();
pr_debug("unregistering driver %s\n", driver->name);
subsys_interface_unregister(&cpufreq_interface);
unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
- spin_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver = NULL;
- spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ rcu_assign_pointer(cpufreq_driver, NULL);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+ synchronize_rcu();
return 0;
}
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 4fd0006b1291..0ceb2eff5a7e 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -20,6 +20,7 @@
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/percpu-defs.h>
+#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/types.h>
@@ -28,25 +29,29 @@
/* Conservative governor macros */
#define DEF_FREQUENCY_UP_THRESHOLD (80)
#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
+#define DEF_FREQUENCY_STEP (5)
#define DEF_SAMPLING_DOWN_FACTOR (1)
#define MAX_SAMPLING_DOWN_FACTOR (10)
-static struct dbs_data cs_dbs_data;
static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info);
-static struct cs_dbs_tuners cs_tuners = {
- .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
- .down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
- .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
- .ignore_nice = 0,
- .freq_step = 5,
-};
+static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners,
+ struct cpufreq_policy *policy)
+{
+ unsigned int freq_target = (cs_tuners->freq_step * policy->max) / 100;
+
+ /* max freq cannot be less than 100. But who knows... */
+ if (unlikely(freq_target == 0))
+ freq_target = DEF_FREQUENCY_STEP;
+
+ return freq_target;
+}
/*
* Every sampling_rate, we check, if current idle time is less than 20%
- * (default), then we try to increase frequency Every sampling_rate *
- * sampling_down_factor, we check, if current idle time is more than 80%, then
- * we try to decrease frequency
+ * (default), then we try to increase frequency. Every sampling_rate *
+ * sampling_down_factor, we check, if current idle time is more than 80%
+ * (default), then we try to decrease frequency
*
* Any frequency increase takes it to the maximum frequency. Frequency reduction
* happens at minimum steps of 5% (default) of maximum frequency
@@ -55,30 +60,25 @@ static void cs_check_cpu(int cpu, unsigned int load)
{
struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);
struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
- unsigned int freq_target;
+ struct dbs_data *dbs_data = policy->governor_data;
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
/*
* break out if we 'cannot' reduce the speed as the user might
* want freq_step to be zero
*/
- if (cs_tuners.freq_step == 0)
+ if (cs_tuners->freq_step == 0)
return;
/* Check for frequency increase */
- if (load > cs_tuners.up_threshold) {
+ if (load > cs_tuners->up_threshold) {
dbs_info->down_skip = 0;
/* if we are already at full speed then break out early */
if (dbs_info->requested_freq == policy->max)
return;
- freq_target = (cs_tuners.freq_step * policy->max) / 100;
-
- /* max freq cannot be less than 100. But who knows.... */
- if (unlikely(freq_target == 0))
- freq_target = 5;
-
- dbs_info->requested_freq += freq_target;
+ dbs_info->requested_freq += get_freq_target(cs_tuners, policy);
if (dbs_info->requested_freq > policy->max)
dbs_info->requested_freq = policy->max;
@@ -87,45 +87,48 @@ static void cs_check_cpu(int cpu, unsigned int load)
return;
}
- /*
- * The optimal frequency is the frequency that is the lowest that can
- * support the current CPU usage without triggering the up policy. To be
- * safe, we focus 10 points under the threshold.
- */
- if (load < (cs_tuners.down_threshold - 10)) {
- freq_target = (cs_tuners.freq_step * policy->max) / 100;
-
- dbs_info->requested_freq -= freq_target;
- if (dbs_info->requested_freq < policy->min)
- dbs_info->requested_freq = policy->min;
+ /* if sampling_down_factor is active break out early */
+ if (++dbs_info->down_skip < cs_tuners->sampling_down_factor)
+ return;
+ dbs_info->down_skip = 0;
+ /* Check for frequency decrease */
+ if (load < cs_tuners->down_threshold) {
/*
* if we cannot reduce the frequency anymore, break out early
*/
if (policy->cur == policy->min)
return;
+ dbs_info->requested_freq -= get_freq_target(cs_tuners, policy);
+ if (dbs_info->requested_freq < policy->min)
+ dbs_info->requested_freq = policy->min;
+
__cpufreq_driver_target(policy, dbs_info->requested_freq,
- CPUFREQ_RELATION_H);
+ CPUFREQ_RELATION_L);
return;
}
}
static void cs_dbs_timer(struct work_struct *work)
{
- struct delayed_work *dw = to_delayed_work(work);
struct cs_cpu_dbs_info_s *dbs_info = container_of(work,
struct cs_cpu_dbs_info_s, cdbs.work.work);
unsigned int cpu = dbs_info->cdbs.cur_policy->cpu;
struct cs_cpu_dbs_info_s *core_dbs_info = &per_cpu(cs_cpu_dbs_info,
cpu);
- int delay = delay_for_sampling_rate(cs_tuners.sampling_rate);
+ struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data;
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ int delay = delay_for_sampling_rate(cs_tuners->sampling_rate);
+ bool modify_all = true;
mutex_lock(&core_dbs_info->cdbs.timer_mutex);
- if (need_load_eval(&core_dbs_info->cdbs, cs_tuners.sampling_rate))
- dbs_check_cpu(&cs_dbs_data, cpu);
+ if (!need_load_eval(&core_dbs_info->cdbs, cs_tuners->sampling_rate))
+ modify_all = false;
+ else
+ dbs_check_cpu(dbs_data, cpu);
- schedule_delayed_work_on(smp_processor_id(), dw, delay);
+ gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all);
mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
}
@@ -154,16 +157,12 @@ static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
}
/************************** sysfs interface ************************/
-static ssize_t show_sampling_rate_min(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- return sprintf(buf, "%u\n", cs_dbs_data.min_sampling_rate);
-}
+static struct common_dbs_data cs_dbs_cdata;
-static ssize_t store_sampling_down_factor(struct kobject *a,
- struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data,
+ const char *buf, size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -171,13 +170,14 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
- cs_tuners.sampling_down_factor = input;
+ cs_tuners->sampling_down_factor = input;
return count;
}
-static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -185,43 +185,46 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
- cs_tuners.sampling_rate = max(input, cs_dbs_data.min_sampling_rate);
+ cs_tuners->sampling_rate = max(input, dbs_data->min_sampling_rate);
return count;
}
-static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
- if (ret != 1 || input > 100 || input <= cs_tuners.down_threshold)
+ if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold)
return -EINVAL;
- cs_tuners.up_threshold = input;
+ cs_tuners->up_threshold = input;
return count;
}
-static ssize_t store_down_threshold(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_down_threshold(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
/* cannot be lower than 11 otherwise freq will not fall */
if (ret != 1 || input < 11 || input > 100 ||
- input >= cs_tuners.up_threshold)
+ input >= cs_tuners->up_threshold)
return -EINVAL;
- cs_tuners.down_threshold = input;
+ cs_tuners->down_threshold = input;
return count;
}
-static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_ignore_nice(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input, j;
int ret;
@@ -232,27 +235,28 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
if (input > 1)
input = 1;
- if (input == cs_tuners.ignore_nice) /* nothing to do */
+ if (input == cs_tuners->ignore_nice) /* nothing to do */
return count;
- cs_tuners.ignore_nice = input;
+ cs_tuners->ignore_nice = input;
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
struct cs_cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(cs_cpu_dbs_info, j);
dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
- &dbs_info->cdbs.prev_cpu_wall);
- if (cs_tuners.ignore_nice)
+ &dbs_info->cdbs.prev_cpu_wall, 0);
+ if (cs_tuners->ignore_nice)
dbs_info->cdbs.prev_cpu_nice =
kcpustat_cpu(j).cpustat[CPUTIME_NICE];
}
return count;
}
-static ssize_t store_freq_step(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_freq_step(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -267,43 +271,88 @@ static ssize_t store_freq_step(struct kobject *a, struct attribute *b,
* no need to test here if freq_step is zero as the user might actually
* want this, they would be crazy though :)
*/
- cs_tuners.freq_step = input;
+ cs_tuners->freq_step = input;
return count;
}
-show_one(cs, sampling_rate, sampling_rate);
-show_one(cs, sampling_down_factor, sampling_down_factor);
-show_one(cs, up_threshold, up_threshold);
-show_one(cs, down_threshold, down_threshold);
-show_one(cs, ignore_nice_load, ignore_nice);
-show_one(cs, freq_step, freq_step);
-
-define_one_global_rw(sampling_rate);
-define_one_global_rw(sampling_down_factor);
-define_one_global_rw(up_threshold);
-define_one_global_rw(down_threshold);
-define_one_global_rw(ignore_nice_load);
-define_one_global_rw(freq_step);
-define_one_global_ro(sampling_rate_min);
-
-static struct attribute *dbs_attributes[] = {
- &sampling_rate_min.attr,
- &sampling_rate.attr,
- &sampling_down_factor.attr,
- &up_threshold.attr,
- &down_threshold.attr,
- &ignore_nice_load.attr,
- &freq_step.attr,
+show_store_one(cs, sampling_rate);
+show_store_one(cs, sampling_down_factor);
+show_store_one(cs, up_threshold);
+show_store_one(cs, down_threshold);
+show_store_one(cs, ignore_nice);
+show_store_one(cs, freq_step);
+declare_show_sampling_rate_min(cs);
+
+gov_sys_pol_attr_rw(sampling_rate);
+gov_sys_pol_attr_rw(sampling_down_factor);
+gov_sys_pol_attr_rw(up_threshold);
+gov_sys_pol_attr_rw(down_threshold);
+gov_sys_pol_attr_rw(ignore_nice);
+gov_sys_pol_attr_rw(freq_step);
+gov_sys_pol_attr_ro(sampling_rate_min);
+
+static struct attribute *dbs_attributes_gov_sys[] = {
+ &sampling_rate_min_gov_sys.attr,
+ &sampling_rate_gov_sys.attr,
+ &sampling_down_factor_gov_sys.attr,
+ &up_threshold_gov_sys.attr,
+ &down_threshold_gov_sys.attr,
+ &ignore_nice_gov_sys.attr,
+ &freq_step_gov_sys.attr,
NULL
};
-static struct attribute_group cs_attr_group = {
- .attrs = dbs_attributes,
+static struct attribute_group cs_attr_group_gov_sys = {
+ .attrs = dbs_attributes_gov_sys,
+ .name = "conservative",
+};
+
+static struct attribute *dbs_attributes_gov_pol[] = {
+ &sampling_rate_min_gov_pol.attr,
+ &sampling_rate_gov_pol.attr,
+ &sampling_down_factor_gov_pol.attr,
+ &up_threshold_gov_pol.attr,
+ &down_threshold_gov_pol.attr,
+ &ignore_nice_gov_pol.attr,
+ &freq_step_gov_pol.attr,
+ NULL
+};
+
+static struct attribute_group cs_attr_group_gov_pol = {
+ .attrs = dbs_attributes_gov_pol,
.name = "conservative",
};
/************************** sysfs end ************************/
+static int cs_init(struct dbs_data *dbs_data)
+{
+ struct cs_dbs_tuners *tuners;
+
+ tuners = kzalloc(sizeof(struct cs_dbs_tuners), GFP_KERNEL);
+ if (!tuners) {
+ pr_err("%s: kzalloc failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
+ tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD;
+ tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
+ tuners->ignore_nice = 0;
+ tuners->freq_step = DEF_FREQUENCY_STEP;
+
+ dbs_data->tuners = tuners;
+ dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ jiffies_to_usecs(10);
+ mutex_init(&dbs_data->mutex);
+ return 0;
+}
+
+static void cs_exit(struct dbs_data *dbs_data)
+{
+ kfree(dbs_data->tuners);
+}
+
define_get_cpu_dbs_routines(cs_cpu_dbs_info);
static struct notifier_block cs_cpufreq_notifier_block = {
@@ -314,21 +363,23 @@ static struct cs_ops cs_ops = {
.notifier_block = &cs_cpufreq_notifier_block,
};
-static struct dbs_data cs_dbs_data = {
+static struct common_dbs_data cs_dbs_cdata = {
.governor = GOV_CONSERVATIVE,
- .attr_group = &cs_attr_group,
- .tuners = &cs_tuners,
+ .attr_group_gov_sys = &cs_attr_group_gov_sys,
+ .attr_group_gov_pol = &cs_attr_group_gov_pol,
.get_cpu_cdbs = get_cpu_cdbs,
.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
.gov_dbs_timer = cs_dbs_timer,
.gov_check_cpu = cs_check_cpu,
.gov_ops = &cs_ops,
+ .init = cs_init,
+ .exit = cs_exit,
};
static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
unsigned int event)
{
- return cpufreq_governor_dbs(&cs_dbs_data, policy, event);
+ return cpufreq_governor_dbs(policy, &cs_dbs_cdata, event);
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
@@ -343,7 +394,6 @@ struct cpufreq_governor cpufreq_gov_conservative = {
static int __init cpufreq_gov_dbs_init(void)
{
- mutex_init(&cs_dbs_data.mutex);
return cpufreq_register_governor(&cpufreq_gov_conservative);
}
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 5a76086ff09b..443442df113b 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -22,12 +22,29 @@
#include <linux/export.h>
#include <linux/kernel_stat.h>
#include <linux/mutex.h>
+#include <linux/slab.h>
#include <linux/tick.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include "cpufreq_governor.h"
+static struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
+{
+ if (have_governor_per_policy())
+ return &policy->kobj;
+ else
+ return cpufreq_global_kobject;
+}
+
+static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data)
+{
+ if (have_governor_per_policy())
+ return dbs_data->cdata->attr_group_gov_pol;
+ else
+ return dbs_data->cdata->attr_group_gov_sys;
+}
+
static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
{
u64 idle_time;
@@ -50,13 +67,13 @@ static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
return cputime_to_usecs(idle_time);
}
-u64 get_cpu_idle_time(unsigned int cpu, u64 *wall)
+u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
{
- u64 idle_time = get_cpu_idle_time_us(cpu, NULL);
+ u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL);
if (idle_time == -1ULL)
return get_cpu_idle_time_jiffy(cpu, wall);
- else
+ else if (!io_busy)
idle_time += get_cpu_iowait_time_us(cpu, wall);
return idle_time;
@@ -65,7 +82,7 @@ EXPORT_SYMBOL_GPL(get_cpu_idle_time);
void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
{
- struct cpu_dbs_common_info *cdbs = dbs_data->get_cpu_cdbs(cpu);
+ struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
struct od_dbs_tuners *od_tuners = dbs_data->tuners;
struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
struct cpufreq_policy *policy;
@@ -73,7 +90,7 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
unsigned int ignore_nice;
unsigned int j;
- if (dbs_data->governor == GOV_ONDEMAND)
+ if (dbs_data->cdata->governor == GOV_ONDEMAND)
ignore_nice = od_tuners->ignore_nice;
else
ignore_nice = cs_tuners->ignore_nice;
@@ -83,13 +100,22 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
/* Get Absolute Load (in terms of freq for ondemand gov) */
for_each_cpu(j, policy->cpus) {
struct cpu_dbs_common_info *j_cdbs;
- u64 cur_wall_time, cur_idle_time, cur_iowait_time;
- unsigned int idle_time, wall_time, iowait_time;
+ u64 cur_wall_time, cur_idle_time;
+ unsigned int idle_time, wall_time;
unsigned int load;
+ int io_busy = 0;
- j_cdbs = dbs_data->get_cpu_cdbs(j);
+ j_cdbs = dbs_data->cdata->get_cpu_cdbs(j);
- cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);
+ /*
+ * For the purpose of ondemand, waiting for disk IO is
+ * an indication that you're performance critical, and
+ * not that the system is actually idle. So do not add
+ * the iowait time to the cpu idle time.
+ */
+ if (dbs_data->cdata->governor == GOV_ONDEMAND)
+ io_busy = od_tuners->io_is_busy;
+ cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, io_busy);
wall_time = (unsigned int)
(cur_wall_time - j_cdbs->prev_cpu_wall);
@@ -117,35 +143,12 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
idle_time += jiffies_to_usecs(cur_nice_jiffies);
}
- if (dbs_data->governor == GOV_ONDEMAND) {
- struct od_cpu_dbs_info_s *od_j_dbs_info =
- dbs_data->get_cpu_dbs_info_s(cpu);
-
- cur_iowait_time = get_cpu_iowait_time_us(j,
- &cur_wall_time);
- if (cur_iowait_time == -1ULL)
- cur_iowait_time = 0;
-
- iowait_time = (unsigned int) (cur_iowait_time -
- od_j_dbs_info->prev_cpu_iowait);
- od_j_dbs_info->prev_cpu_iowait = cur_iowait_time;
-
- /*
- * For the purpose of ondemand, waiting for disk IO is
- * an indication that you're performance critical, and
- * not that the system is actually idle. So subtract the
- * iowait time from the cpu idle time.
- */
- if (od_tuners->io_is_busy && idle_time >= iowait_time)
- idle_time -= iowait_time;
- }
-
if (unlikely(!wall_time || wall_time < idle_time))
continue;
load = 100 * (wall_time - idle_time) / wall_time;
- if (dbs_data->governor == GOV_ONDEMAND) {
+ if (dbs_data->cdata->governor == GOV_ONDEMAND) {
int freq_avg = __cpufreq_driver_getavg(policy, j);
if (freq_avg <= 0)
freq_avg = policy->cur;
@@ -157,24 +160,42 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
max_load = load;
}
- dbs_data->gov_check_cpu(cpu, max_load);
+ dbs_data->cdata->gov_check_cpu(cpu, max_load);
}
EXPORT_SYMBOL_GPL(dbs_check_cpu);
-static inline void dbs_timer_init(struct dbs_data *dbs_data, int cpu,
- unsigned int sampling_rate)
+static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
+ unsigned int delay)
{
- int delay = delay_for_sampling_rate(sampling_rate);
- struct cpu_dbs_common_info *cdbs = dbs_data->get_cpu_cdbs(cpu);
+ struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
- schedule_delayed_work_on(cpu, &cdbs->work, delay);
+ mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
}
-static inline void dbs_timer_exit(struct dbs_data *dbs_data, int cpu)
+void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
+ unsigned int delay, bool all_cpus)
{
- struct cpu_dbs_common_info *cdbs = dbs_data->get_cpu_cdbs(cpu);
+ int i;
- cancel_delayed_work_sync(&cdbs->work);
+ if (!all_cpus) {
+ __gov_queue_work(smp_processor_id(), dbs_data, delay);
+ } else {
+ for_each_cpu(i, policy->cpus)
+ __gov_queue_work(i, dbs_data, delay);
+ }
+}
+EXPORT_SYMBOL_GPL(gov_queue_work);
+
+static inline void gov_cancel_work(struct dbs_data *dbs_data,
+ struct cpufreq_policy *policy)
+{
+ struct cpu_dbs_common_info *cdbs;
+ int i;
+
+ for_each_cpu(i, policy->cpus) {
+ cdbs = dbs_data->cdata->get_cpu_cdbs(i);
+ cancel_delayed_work_sync(&cdbs->work);
+ }
}
/* Will return if we need to evaluate cpu load again or not */
@@ -196,31 +217,130 @@ bool need_load_eval(struct cpu_dbs_common_info *cdbs,
}
EXPORT_SYMBOL_GPL(need_load_eval);
-int cpufreq_governor_dbs(struct dbs_data *dbs_data,
- struct cpufreq_policy *policy, unsigned int event)
+static void set_sampling_rate(struct dbs_data *dbs_data,
+ unsigned int sampling_rate)
{
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+ struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ cs_tuners->sampling_rate = sampling_rate;
+ } else {
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ od_tuners->sampling_rate = sampling_rate;
+ }
+}
+
+int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+ struct common_dbs_data *cdata, unsigned int event)
+{
+ struct dbs_data *dbs_data;
struct od_cpu_dbs_info_s *od_dbs_info = NULL;
struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
- struct cs_ops *cs_ops = NULL;
struct od_ops *od_ops = NULL;
- struct od_dbs_tuners *od_tuners = dbs_data->tuners;
- struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
+ struct od_dbs_tuners *od_tuners = NULL;
+ struct cs_dbs_tuners *cs_tuners = NULL;
struct cpu_dbs_common_info *cpu_cdbs;
- unsigned int *sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
+ unsigned int sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
+ int io_busy = 0;
int rc;
- cpu_cdbs = dbs_data->get_cpu_cdbs(cpu);
+ if (have_governor_per_policy())
+ dbs_data = policy->governor_data;
+ else
+ dbs_data = cdata->gdbs_data;
+
+ WARN_ON(!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT));
+
+ switch (event) {
+ case CPUFREQ_GOV_POLICY_INIT:
+ if (have_governor_per_policy()) {
+ WARN_ON(dbs_data);
+ } else if (dbs_data) {
+ policy->governor_data = dbs_data;
+ return 0;
+ }
+
+ dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
+ if (!dbs_data) {
+ pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ dbs_data->cdata = cdata;
+ rc = cdata->init(dbs_data);
+ if (rc) {
+ pr_err("%s: POLICY_INIT: init() failed\n", __func__);
+ kfree(dbs_data);
+ return rc;
+ }
+
+ rc = sysfs_create_group(get_governor_parent_kobj(policy),
+ get_sysfs_attr(dbs_data));
+ if (rc) {
+ cdata->exit(dbs_data);
+ kfree(dbs_data);
+ return rc;
+ }
+
+ policy->governor_data = dbs_data;
- if (dbs_data->governor == GOV_CONSERVATIVE) {
- cs_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
- sampling_rate = &cs_tuners->sampling_rate;
+ /* policy latency is in nS. Convert it to uS first */
+ latency = policy->cpuinfo.transition_latency / 1000;
+ if (latency == 0)
+ latency = 1;
+
+ /* Bring kernel and HW constraints together */
+ dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
+ MIN_LATENCY_MULTIPLIER * latency);
+ set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
+ latency * LATENCY_MULTIPLIER));
+
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+ struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
+
+ cpufreq_register_notifier(cs_ops->notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
+ if (!have_governor_per_policy())
+ cdata->gdbs_data = dbs_data;
+
+ return 0;
+ case CPUFREQ_GOV_POLICY_EXIT:
+ if ((policy->governor->initialized == 1) ||
+ have_governor_per_policy()) {
+ sysfs_remove_group(get_governor_parent_kobj(policy),
+ get_sysfs_attr(dbs_data));
+
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+ struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
+
+ cpufreq_unregister_notifier(cs_ops->notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
+ cdata->exit(dbs_data);
+ kfree(dbs_data);
+ cdata->gdbs_data = NULL;
+ }
+
+ policy->governor_data = NULL;
+ return 0;
+ }
+
+ cpu_cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
+
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
+ cs_tuners = dbs_data->tuners;
+ cs_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
+ sampling_rate = cs_tuners->sampling_rate;
ignore_nice = cs_tuners->ignore_nice;
- cs_ops = dbs_data->gov_ops;
} else {
- od_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
- sampling_rate = &od_tuners->sampling_rate;
+ od_tuners = dbs_data->tuners;
+ od_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
+ sampling_rate = od_tuners->sampling_rate;
ignore_nice = od_tuners->ignore_nice;
- od_ops = dbs_data->gov_ops;
+ od_ops = dbs_data->cdata->gov_ops;
+ io_busy = od_tuners->io_is_busy;
}
switch (event) {
@@ -232,96 +352,53 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
for_each_cpu(j, policy->cpus) {
struct cpu_dbs_common_info *j_cdbs =
- dbs_data->get_cpu_cdbs(j);
+ dbs_data->cdata->get_cpu_cdbs(j);
j_cdbs->cpu = j;
j_cdbs->cur_policy = policy;
j_cdbs->prev_cpu_idle = get_cpu_idle_time(j,
- &j_cdbs->prev_cpu_wall);
+ &j_cdbs->prev_cpu_wall, io_busy);
if (ignore_nice)
j_cdbs->prev_cpu_nice =
kcpustat_cpu(j).cpustat[CPUTIME_NICE];
mutex_init(&j_cdbs->timer_mutex);
INIT_DEFERRABLE_WORK(&j_cdbs->work,
- dbs_data->gov_dbs_timer);
- }
-
- if (!policy->governor->initialized) {
- rc = sysfs_create_group(cpufreq_global_kobject,
- dbs_data->attr_group);
- if (rc) {
- mutex_unlock(&dbs_data->mutex);
- return rc;
- }
+ dbs_data->cdata->gov_dbs_timer);
}
/*
* conservative does not implement micro like ondemand
* governor, thus we are bound to jiffes/HZ
*/
- if (dbs_data->governor == GOV_CONSERVATIVE) {
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
cs_dbs_info->down_skip = 0;
cs_dbs_info->enable = 1;
cs_dbs_info->requested_freq = policy->cur;
-
- if (!policy->governor->initialized) {
- cpufreq_register_notifier(cs_ops->notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
-
- dbs_data->min_sampling_rate =
- MIN_SAMPLING_RATE_RATIO *
- jiffies_to_usecs(10);
- }
} else {
od_dbs_info->rate_mult = 1;
od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
od_ops->powersave_bias_init_cpu(cpu);
-
- if (!policy->governor->initialized)
- od_tuners->io_is_busy = od_ops->io_busy();
}
- if (policy->governor->initialized)
- goto unlock;
-
- /* policy latency is in nS. Convert it to uS first */
- latency = policy->cpuinfo.transition_latency / 1000;
- if (latency == 0)
- latency = 1;
-
- /* Bring kernel and HW constraints together */
- dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
- MIN_LATENCY_MULTIPLIER * latency);
- *sampling_rate = max(dbs_data->min_sampling_rate, latency *
- LATENCY_MULTIPLIER);
-unlock:
mutex_unlock(&dbs_data->mutex);
/* Initiate timer time stamp */
cpu_cdbs->time_stamp = ktime_get();
- for_each_cpu(j, policy->cpus)
- dbs_timer_init(dbs_data, j, *sampling_rate);
+ gov_queue_work(dbs_data, policy,
+ delay_for_sampling_rate(sampling_rate), true);
break;
case CPUFREQ_GOV_STOP:
- if (dbs_data->governor == GOV_CONSERVATIVE)
+ if (dbs_data->cdata->governor == GOV_CONSERVATIVE)
cs_dbs_info->enable = 0;
- for_each_cpu(j, policy->cpus)
- dbs_timer_exit(dbs_data, j);
+ gov_cancel_work(dbs_data, policy);
mutex_lock(&dbs_data->mutex);
mutex_destroy(&cpu_cdbs->timer_mutex);
- if (policy->governor->initialized == 1) {
- sysfs_remove_group(cpufreq_global_kobject,
- dbs_data->attr_group);
- if (dbs_data->governor == GOV_CONSERVATIVE)
- cpufreq_unregister_notifier(cs_ops->notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
- }
mutex_unlock(&dbs_data->mutex);
break;
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index cc4bd2f6838a..8ac33538d0bd 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -34,20 +34,81 @@
*/
#define MIN_SAMPLING_RATE_RATIO (2)
#define LATENCY_MULTIPLIER (1000)
-#define MIN_LATENCY_MULTIPLIER (100)
+#define MIN_LATENCY_MULTIPLIER (20)
#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
/* Ondemand Sampling types */
enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
-/* Macro creating sysfs show routines */
-#define show_one(_gov, file_name, object) \
-static ssize_t show_##file_name \
+/*
+ * Macro for creating governors sysfs routines
+ *
+ * - gov_sys: One governor instance per whole system
+ * - gov_pol: One governor instance per policy
+ */
+
+/* Create attributes */
+#define gov_sys_attr_ro(_name) \
+static struct global_attr _name##_gov_sys = \
+__ATTR(_name, 0444, show_##_name##_gov_sys, NULL)
+
+#define gov_sys_attr_rw(_name) \
+static struct global_attr _name##_gov_sys = \
+__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
+
+#define gov_pol_attr_ro(_name) \
+static struct freq_attr _name##_gov_pol = \
+__ATTR(_name, 0444, show_##_name##_gov_pol, NULL)
+
+#define gov_pol_attr_rw(_name) \
+static struct freq_attr _name##_gov_pol = \
+__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
+
+#define gov_sys_pol_attr_rw(_name) \
+ gov_sys_attr_rw(_name); \
+ gov_pol_attr_rw(_name)
+
+#define gov_sys_pol_attr_ro(_name) \
+ gov_sys_attr_ro(_name); \
+ gov_pol_attr_ro(_name)
+
+/* Create show/store routines */
+#define show_one(_gov, file_name) \
+static ssize_t show_##file_name##_gov_sys \
(struct kobject *kobj, struct attribute *attr, char *buf) \
{ \
- return sprintf(buf, "%u\n", _gov##_tuners.object); \
+ struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \
+ return sprintf(buf, "%u\n", tuners->file_name); \
+} \
+ \
+static ssize_t show_##file_name##_gov_pol \
+(struct cpufreq_policy *policy, char *buf) \
+{ \
+ struct dbs_data *dbs_data = policy->governor_data; \
+ struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \
+ return sprintf(buf, "%u\n", tuners->file_name); \
+}
+
+#define store_one(_gov, file_name) \
+static ssize_t store_##file_name##_gov_sys \
+(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \
+{ \
+ struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
+ return store_##file_name(dbs_data, buf, count); \
+} \
+ \
+static ssize_t store_##file_name##_gov_pol \
+(struct cpufreq_policy *policy, const char *buf, size_t count) \
+{ \
+ struct dbs_data *dbs_data = policy->governor_data; \
+ return store_##file_name(dbs_data, buf, count); \
}
+#define show_store_one(_gov, file_name) \
+show_one(_gov, file_name); \
+store_one(_gov, file_name)
+
+/* create helper routines */
#define define_get_cpu_dbs_routines(_dbs_info) \
static struct cpu_dbs_common_info *get_cpu_cdbs(int cpu) \
{ \
@@ -87,7 +148,6 @@ struct cpu_dbs_common_info {
struct od_cpu_dbs_info_s {
struct cpu_dbs_common_info cdbs;
- u64 prev_cpu_iowait;
struct cpufreq_frequency_table *freq_table;
unsigned int freq_lo;
unsigned int freq_lo_jiffies;
@@ -103,7 +163,7 @@ struct cs_cpu_dbs_info_s {
unsigned int enable:1;
};
-/* Governers sysfs tunables */
+/* Per policy Governers sysfs tunables */
struct od_dbs_tuners {
unsigned int ignore_nice;
unsigned int sampling_rate;
@@ -123,31 +183,42 @@ struct cs_dbs_tuners {
unsigned int freq_step;
};
-/* Per Governer data */
-struct dbs_data {
+/* Common Governer data across policies */
+struct dbs_data;
+struct common_dbs_data {
/* Common across governors */
#define GOV_ONDEMAND 0
#define GOV_CONSERVATIVE 1
int governor;
- unsigned int min_sampling_rate;
- struct attribute_group *attr_group;
- void *tuners;
+ struct attribute_group *attr_group_gov_sys; /* one governor - system */
+ struct attribute_group *attr_group_gov_pol; /* one governor - policy */
- /* dbs_mutex protects dbs_enable in governor start/stop */
- struct mutex mutex;
+ /* Common data for platforms that don't set have_governor_per_policy */
+ struct dbs_data *gdbs_data;
struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu);
void *(*get_cpu_dbs_info_s)(int cpu);
void (*gov_dbs_timer)(struct work_struct *work);
void (*gov_check_cpu)(int cpu, unsigned int load);
+ int (*init)(struct dbs_data *dbs_data);
+ void (*exit)(struct dbs_data *dbs_data);
/* Governor specific ops, see below */
void *gov_ops;
};
+/* Governer Per policy data */
+struct dbs_data {
+ struct common_dbs_data *cdata;
+ unsigned int min_sampling_rate;
+ void *tuners;
+
+ /* dbs_mutex protects dbs_enable in governor start/stop */
+ struct mutex mutex;
+};
+
/* Governor specific ops, will be passed to dbs_data->gov_ops */
struct od_ops {
- int (*io_busy)(void);
void (*powersave_bias_init_cpu)(int cpu);
unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
unsigned int freq_next, unsigned int relation);
@@ -169,10 +240,31 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate)
return delay;
}
-u64 get_cpu_idle_time(unsigned int cpu, u64 *wall);
+#define declare_show_sampling_rate_min(_gov) \
+static ssize_t show_sampling_rate_min_gov_sys \
+(struct kobject *kobj, struct attribute *attr, char *buf) \
+{ \
+ struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
+ return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
+} \
+ \
+static ssize_t show_sampling_rate_min_gov_pol \
+(struct cpufreq_policy *policy, char *buf) \
+{ \
+ struct dbs_data *dbs_data = policy->governor_data; \
+ return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
+}
+
+u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
bool need_load_eval(struct cpu_dbs_common_info *cdbs,
unsigned int sampling_rate);
-int cpufreq_governor_dbs(struct dbs_data *dbs_data,
- struct cpufreq_policy *policy, unsigned int event);
+int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+ struct common_dbs_data *cdata, unsigned int event);
+void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
+ unsigned int delay, bool all_cpus);
+void od_register_powersave_bias_handler(unsigned int (*f)
+ (struct cpufreq_policy *, unsigned int, unsigned int),
+ unsigned int powersave_bias);
+void od_unregister_powersave_bias_handler(void);
#endif /* _CPUFREQ_GOVERNOR_H */
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index f3eb26cd848f..b0ffef96bf77 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -20,9 +20,11 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/percpu-defs.h>
+#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/tick.h>
#include <linux/types.h>
+#include <linux/cpu.h>
#include "cpufreq_governor.h"
@@ -37,22 +39,14 @@
#define MIN_FREQUENCY_UP_THRESHOLD (11)
#define MAX_FREQUENCY_UP_THRESHOLD (100)
-static struct dbs_data od_dbs_data;
static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
+static struct od_ops od_ops;
+
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
static struct cpufreq_governor cpufreq_gov_ondemand;
#endif
-static struct od_dbs_tuners od_tuners = {
- .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
- .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
- .adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD -
- DEF_FREQUENCY_DOWN_DIFFERENTIAL,
- .ignore_nice = 0,
- .powersave_bias = 0,
-};
-
static void ondemand_powersave_bias_init_cpu(int cpu)
{
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
@@ -89,7 +83,7 @@ static int should_io_be_busy(void)
* Returns the freq_hi to be used right now and will set freq_hi_jiffies,
* freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
*/
-static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
+static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
unsigned int freq_next, unsigned int relation)
{
unsigned int freq_req, freq_reduc, freq_avg;
@@ -98,6 +92,8 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
unsigned int jiffies_total, jiffies_hi, jiffies_lo;
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
policy->cpu);
+ struct dbs_data *dbs_data = policy->governor_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
if (!dbs_info->freq_table) {
dbs_info->freq_lo = 0;
@@ -108,7 +104,7 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
relation, &index);
freq_req = dbs_info->freq_table[index].frequency;
- freq_reduc = freq_req * od_tuners.powersave_bias / 1000;
+ freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
freq_avg = freq_req - freq_reduc;
/* Find freq bounds for freq_avg in freq_table */
@@ -127,7 +123,7 @@ static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
dbs_info->freq_lo_jiffies = 0;
return freq_lo;
}
- jiffies_total = usecs_to_jiffies(od_tuners.sampling_rate);
+ jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate);
jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
jiffies_hi += ((freq_hi - freq_lo) / 2);
jiffies_hi /= (freq_hi - freq_lo);
@@ -148,12 +144,16 @@ static void ondemand_powersave_bias_init(void)
static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
{
- if (od_tuners.powersave_bias)
- freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
+ struct dbs_data *dbs_data = p->governor_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+
+ if (od_tuners->powersave_bias)
+ freq = od_ops.powersave_bias_target(p, freq,
+ CPUFREQ_RELATION_H);
else if (p->cur == p->max)
return;
- __cpufreq_driver_target(p, freq, od_tuners.powersave_bias ?
+ __cpufreq_driver_target(p, freq, od_tuners->powersave_bias ?
CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
}
@@ -170,15 +170,17 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
{
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy;
+ struct dbs_data *dbs_data = policy->governor_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
dbs_info->freq_lo = 0;
/* Check for frequency increase */
- if (load_freq > od_tuners.up_threshold * policy->cur) {
+ if (load_freq > od_tuners->up_threshold * policy->cur) {
/* If switching to max speed, apply sampling_down_factor */
if (policy->cur < policy->max)
dbs_info->rate_mult =
- od_tuners.sampling_down_factor;
+ od_tuners->sampling_down_factor;
dbs_freq_increase(policy, policy->max);
return;
}
@@ -193,9 +195,10 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
* support the current CPU usage without triggering the up policy. To be
* safe, we focus 10 points under the threshold.
*/
- if (load_freq < od_tuners.adj_up_threshold * policy->cur) {
+ if (load_freq < od_tuners->adj_up_threshold
+ * policy->cur) {
unsigned int freq_next;
- freq_next = load_freq / od_tuners.adj_up_threshold;
+ freq_next = load_freq / od_tuners->adj_up_threshold;
/* No longer fully busy, reset rate_mult */
dbs_info->rate_mult = 1;
@@ -203,65 +206,62 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
if (freq_next < policy->min)
freq_next = policy->min;
- if (!od_tuners.powersave_bias) {
+ if (!od_tuners->powersave_bias) {
__cpufreq_driver_target(policy, freq_next,
CPUFREQ_RELATION_L);
- } else {
- int freq = powersave_bias_target(policy, freq_next,
- CPUFREQ_RELATION_L);
- __cpufreq_driver_target(policy, freq,
- CPUFREQ_RELATION_L);
+ return;
}
+
+ freq_next = od_ops.powersave_bias_target(policy, freq_next,
+ CPUFREQ_RELATION_L);
+ __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
}
}
static void od_dbs_timer(struct work_struct *work)
{
- struct delayed_work *dw = to_delayed_work(work);
struct od_cpu_dbs_info_s *dbs_info =
container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work);
unsigned int cpu = dbs_info->cdbs.cur_policy->cpu;
struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info,
cpu);
- int delay, sample_type = core_dbs_info->sample_type;
- bool eval_load;
+ struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data;
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
+ int delay = 0, sample_type = core_dbs_info->sample_type;
+ bool modify_all = true;
mutex_lock(&core_dbs_info->cdbs.timer_mutex);
- eval_load = need_load_eval(&core_dbs_info->cdbs,
- od_tuners.sampling_rate);
+ if (!need_load_eval(&core_dbs_info->cdbs, od_tuners->sampling_rate)) {
+ modify_all = false;
+ goto max_delay;
+ }
/* Common NORMAL_SAMPLE setup */
core_dbs_info->sample_type = OD_NORMAL_SAMPLE;
if (sample_type == OD_SUB_SAMPLE) {
delay = core_dbs_info->freq_lo_jiffies;
- if (eval_load)
- __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy,
- core_dbs_info->freq_lo,
- CPUFREQ_RELATION_H);
+ __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy,
+ core_dbs_info->freq_lo, CPUFREQ_RELATION_H);
} else {
- if (eval_load)
- dbs_check_cpu(&od_dbs_data, cpu);
+ dbs_check_cpu(dbs_data, cpu);
if (core_dbs_info->freq_lo) {
/* Setup timer for SUB_SAMPLE */
core_dbs_info->sample_type = OD_SUB_SAMPLE;
delay = core_dbs_info->freq_hi_jiffies;
- } else {
- delay = delay_for_sampling_rate(od_tuners.sampling_rate
- * core_dbs_info->rate_mult);
}
}
- schedule_delayed_work_on(smp_processor_id(), dw, delay);
+max_delay:
+ if (!delay)
+ delay = delay_for_sampling_rate(od_tuners->sampling_rate
+ * core_dbs_info->rate_mult);
+
+ gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all);
mutex_unlock(&core_dbs_info->cdbs.timer_mutex);
}
/************************** sysfs interface ************************/
-
-static ssize_t show_sampling_rate_min(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- return sprintf(buf, "%u\n", od_dbs_data.min_sampling_rate);
-}
+static struct common_dbs_data od_dbs_cdata;
/**
* update_sampling_rate - update sampling rate effective immediately if needed.
@@ -276,12 +276,14 @@ static ssize_t show_sampling_rate_min(struct kobject *kobj,
* reducing the sampling rate, we need to make the new value effective
* immediately.
*/
-static void update_sampling_rate(unsigned int new_rate)
+static void update_sampling_rate(struct dbs_data *dbs_data,
+ unsigned int new_rate)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
int cpu;
- od_tuners.sampling_rate = new_rate = max(new_rate,
- od_dbs_data.min_sampling_rate);
+ od_tuners->sampling_rate = new_rate = max(new_rate,
+ dbs_data->min_sampling_rate);
for_each_online_cpu(cpu) {
struct cpufreq_policy *policy;
@@ -314,42 +316,54 @@ static void update_sampling_rate(unsigned int new_rate)
cancel_delayed_work_sync(&dbs_info->cdbs.work);
mutex_lock(&dbs_info->cdbs.timer_mutex);
- schedule_delayed_work_on(cpu, &dbs_info->cdbs.work,
- usecs_to_jiffies(new_rate));
+ gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy,
+ usecs_to_jiffies(new_rate), true);
}
mutex_unlock(&dbs_info->cdbs.timer_mutex);
}
}
-static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
- update_sampling_rate(input);
+
+ update_sampling_rate(dbs_data, input);
return count;
}
-static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int input;
int ret;
+ unsigned int j;
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
- od_tuners.io_is_busy = !!input;
+ od_tuners->io_is_busy = !!input;
+
+ /* we need to re-evaluate prev_cpu_idle */
+ for_each_online_cpu(j) {
+ struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
+ j);
+ dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
+ &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
+ }
return count;
}
-static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -359,23 +373,24 @@ static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
return -EINVAL;
}
/* Calculate the new adj_up_threshold */
- od_tuners.adj_up_threshold += input;
- od_tuners.adj_up_threshold -= od_tuners.up_threshold;
+ od_tuners->adj_up_threshold += input;
+ od_tuners->adj_up_threshold -= od_tuners->up_threshold;
- od_tuners.up_threshold = input;
+ od_tuners->up_threshold = input;
return count;
}
-static ssize_t store_sampling_down_factor(struct kobject *a,
- struct attribute *b, const char *buf, size_t count)
+static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data,
+ const char *buf, size_t count)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int input, j;
int ret;
ret = sscanf(buf, "%u", &input);
if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
- od_tuners.sampling_down_factor = input;
+ od_tuners->sampling_down_factor = input;
/* Reset down sampling multiplier in case it was active */
for_each_online_cpu(j) {
@@ -386,9 +401,10 @@ static ssize_t store_sampling_down_factor(struct kobject *a,
return count;
}
-static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_ignore_nice(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int input;
int ret;
@@ -401,18 +417,18 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
if (input > 1)
input = 1;
- if (input == od_tuners.ignore_nice) { /* nothing to do */
+ if (input == od_tuners->ignore_nice) { /* nothing to do */
return count;
}
- od_tuners.ignore_nice = input;
+ od_tuners->ignore_nice = input;
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
struct od_cpu_dbs_info_s *dbs_info;
dbs_info = &per_cpu(od_cpu_dbs_info, j);
dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
- &dbs_info->cdbs.prev_cpu_wall);
- if (od_tuners.ignore_nice)
+ &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
+ if (od_tuners->ignore_nice)
dbs_info->cdbs.prev_cpu_nice =
kcpustat_cpu(j).cpustat[CPUTIME_NICE];
@@ -420,9 +436,10 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
return count;
}
-static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
- const char *buf, size_t count)
+static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
+ size_t count)
{
+ struct od_dbs_tuners *od_tuners = dbs_data->tuners;
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
@@ -433,68 +450,179 @@ static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
if (input > 1000)
input = 1000;
- od_tuners.powersave_bias = input;
+ od_tuners->powersave_bias = input;
ondemand_powersave_bias_init();
return count;
}
-show_one(od, sampling_rate, sampling_rate);
-show_one(od, io_is_busy, io_is_busy);
-show_one(od, up_threshold, up_threshold);
-show_one(od, sampling_down_factor, sampling_down_factor);
-show_one(od, ignore_nice_load, ignore_nice);
-show_one(od, powersave_bias, powersave_bias);
-
-define_one_global_rw(sampling_rate);
-define_one_global_rw(io_is_busy);
-define_one_global_rw(up_threshold);
-define_one_global_rw(sampling_down_factor);
-define_one_global_rw(ignore_nice_load);
-define_one_global_rw(powersave_bias);
-define_one_global_ro(sampling_rate_min);
-
-static struct attribute *dbs_attributes[] = {
- &sampling_rate_min.attr,
- &sampling_rate.attr,
- &up_threshold.attr,
- &sampling_down_factor.attr,
- &ignore_nice_load.attr,
- &powersave_bias.attr,
- &io_is_busy.attr,
+show_store_one(od, sampling_rate);
+show_store_one(od, io_is_busy);
+show_store_one(od, up_threshold);
+show_store_one(od, sampling_down_factor);
+show_store_one(od, ignore_nice);
+show_store_one(od, powersave_bias);
+declare_show_sampling_rate_min(od);
+
+gov_sys_pol_attr_rw(sampling_rate);
+gov_sys_pol_attr_rw(io_is_busy);
+gov_sys_pol_attr_rw(up_threshold);
+gov_sys_pol_attr_rw(sampling_down_factor);
+gov_sys_pol_attr_rw(ignore_nice);
+gov_sys_pol_attr_rw(powersave_bias);
+gov_sys_pol_attr_ro(sampling_rate_min);
+
+static struct attribute *dbs_attributes_gov_sys[] = {
+ &sampling_rate_min_gov_sys.attr,
+ &sampling_rate_gov_sys.attr,
+ &up_threshold_gov_sys.attr,
+ &sampling_down_factor_gov_sys.attr,
+ &ignore_nice_gov_sys.attr,
+ &powersave_bias_gov_sys.attr,
+ &io_is_busy_gov_sys.attr,
+ NULL
+};
+
+static struct attribute_group od_attr_group_gov_sys = {
+ .attrs = dbs_attributes_gov_sys,
+ .name = "ondemand",
+};
+
+static struct attribute *dbs_attributes_gov_pol[] = {
+ &sampling_rate_min_gov_pol.attr,
+ &sampling_rate_gov_pol.attr,
+ &up_threshold_gov_pol.attr,
+ &sampling_down_factor_gov_pol.attr,
+ &ignore_nice_gov_pol.attr,
+ &powersave_bias_gov_pol.attr,
+ &io_is_busy_gov_pol.attr,
NULL
};
-static struct attribute_group od_attr_group = {
- .attrs = dbs_attributes,
+static struct attribute_group od_attr_group_gov_pol = {
+ .attrs = dbs_attributes_gov_pol,
.name = "ondemand",
};
/************************** sysfs end ************************/
+static int od_init(struct dbs_data *dbs_data)
+{
+ struct od_dbs_tuners *tuners;
+ u64 idle_time;
+ int cpu;
+
+ tuners = kzalloc(sizeof(struct od_dbs_tuners), GFP_KERNEL);
+ if (!tuners) {
+ pr_err("%s: kzalloc failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ cpu = get_cpu();
+ idle_time = get_cpu_idle_time_us(cpu, NULL);
+ put_cpu();
+ if (idle_time != -1ULL) {
+ /* Idle micro accounting is supported. Use finer thresholds */
+ tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
+ tuners->adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD -
+ MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
+ /*
+ * In nohz/micro accounting case we set the minimum frequency
+ * not depending on HZ, but fixed (very low). The deferred
+ * timer might skip some samples if idle/sleeping as needed.
+ */
+ dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
+ } else {
+ tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
+ tuners->adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD -
+ DEF_FREQUENCY_DOWN_DIFFERENTIAL;
+
+ /* For correct statistics, we need 10 ticks for each measure */
+ dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
+ jiffies_to_usecs(10);
+ }
+
+ tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
+ tuners->ignore_nice = 0;
+ tuners->powersave_bias = 0;
+ tuners->io_is_busy = should_io_be_busy();
+
+ dbs_data->tuners = tuners;
+ pr_info("%s: tuners %p\n", __func__, tuners);
+ mutex_init(&dbs_data->mutex);
+ return 0;
+}
+
+static void od_exit(struct dbs_data *dbs_data)
+{
+ kfree(dbs_data->tuners);
+}
+
define_get_cpu_dbs_routines(od_cpu_dbs_info);
static struct od_ops od_ops = {
- .io_busy = should_io_be_busy,
.powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
- .powersave_bias_target = powersave_bias_target,
+ .powersave_bias_target = generic_powersave_bias_target,
.freq_increase = dbs_freq_increase,
};
-static struct dbs_data od_dbs_data = {
+static struct common_dbs_data od_dbs_cdata = {
.governor = GOV_ONDEMAND,
- .attr_group = &od_attr_group,
- .tuners = &od_tuners,
+ .attr_group_gov_sys = &od_attr_group_gov_sys,
+ .attr_group_gov_pol = &od_attr_group_gov_pol,
.get_cpu_cdbs = get_cpu_cdbs,
.get_cpu_dbs_info_s = get_cpu_dbs_info_s,
.gov_dbs_timer = od_dbs_timer,
.gov_check_cpu = od_check_cpu,
.gov_ops = &od_ops,
+ .init = od_init,
+ .exit = od_exit,
};
+static void od_set_powersave_bias(unsigned int powersave_bias)
+{
+ struct cpufreq_policy *policy;
+ struct dbs_data *dbs_data;
+ struct od_dbs_tuners *od_tuners;
+ unsigned int cpu;
+ cpumask_t done;
+
+ cpumask_clear(&done);
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ if (cpumask_test_cpu(cpu, &done))
+ continue;
+
+ policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy;
+ dbs_data = policy->governor_data;
+ od_tuners = dbs_data->tuners;
+ od_tuners->powersave_bias = powersave_bias;
+
+ cpumask_or(&done, &done, policy->cpus);
+ }
+ put_online_cpus();
+}
+
+void od_register_powersave_bias_handler(unsigned int (*f)
+ (struct cpufreq_policy *, unsigned int, unsigned int),
+ unsigned int powersave_bias)
+{
+ od_ops.powersave_bias_target = f;
+ od_set_powersave_bias(powersave_bias);
+}
+EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
+
+void od_unregister_powersave_bias_handler(void)
+{
+ od_ops.powersave_bias_target = generic_powersave_bias_target;
+ od_set_powersave_bias(0);
+}
+EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
+
static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
unsigned int event)
{
- return cpufreq_governor_dbs(&od_dbs_data, policy, event);
+ return cpufreq_governor_dbs(policy, &od_dbs_cdata, event);
}
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
@@ -509,29 +637,6 @@ struct cpufreq_governor cpufreq_gov_ondemand = {
static int __init cpufreq_gov_dbs_init(void)
{
- u64 idle_time;
- int cpu = get_cpu();
-
- mutex_init(&od_dbs_data.mutex);
- idle_time = get_cpu_idle_time_us(cpu, NULL);
- put_cpu();
- if (idle_time != -1ULL) {
- /* Idle micro accounting is supported. Use finer thresholds */
- od_tuners.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
- od_tuners.adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD -
- MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
- /*
- * In nohz/micro accounting case we set the minimum frequency
- * not depending on HZ, but fixed (very low). The deferred
- * timer might skip some samples if idle/sleeping as needed.
- */
- od_dbs_data.min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
- } else {
- /* For correct statistics, we need 10 ticks for each measure */
- od_dbs_data.min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
- jiffies_to_usecs(10);
- }
-
return cpufreq_register_governor(&cpufreq_gov_ondemand);
}
diff --git a/drivers/cpufreq/cris-artpec3-cpufreq.c b/drivers/cpufreq/cris-artpec3-cpufreq.c
new file mode 100644
index 000000000000..ee142c490575
--- /dev/null
+++ b/drivers/cpufreq/cris-artpec3-cpufreq.c
@@ -0,0 +1,146 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <hwregs/reg_map.h>
+#include <hwregs/reg_rdwr.h>
+#include <hwregs/clkgen_defs.h>
+#include <hwregs/ddr2_defs.h>
+
+static int
+cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data);
+
+static struct notifier_block cris_sdram_freq_notifier_block = {
+ .notifier_call = cris_sdram_freq_notifier
+};
+
+static struct cpufreq_frequency_table cris_freq_table[] = {
+ {0x01, 6000},
+ {0x02, 200000},
+ {0, CPUFREQ_TABLE_END},
+};
+
+static unsigned int cris_freq_get_cpu_frequency(unsigned int cpu)
+{
+ reg_clkgen_rw_clk_ctrl clk_ctrl;
+ clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
+ return clk_ctrl.pll ? 200000 : 6000;
+}
+
+static void cris_freq_set_cpu_state(struct cpufreq_policy *policy,
+ unsigned int state)
+{
+ struct cpufreq_freqs freqs;
+ reg_clkgen_rw_clk_ctrl clk_ctrl;
+ clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
+
+ freqs.old = cris_freq_get_cpu_frequency(policy->cpu);
+ freqs.new = cris_freq_table[state].frequency;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ local_irq_disable();
+
+ /* Even though we may be SMP they will share the same clock
+ * so all settings are made on CPU0. */
+ if (cris_freq_table[state].frequency == 200000)
+ clk_ctrl.pll = 1;
+ else
+ clk_ctrl.pll = 0;
+ REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
+
+ local_irq_enable();
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+};
+
+static int cris_freq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, &cris_freq_table[0]);
+}
+
+static int cris_freq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int newstate = 0;
+
+ if (cpufreq_frequency_table_target(policy, cris_freq_table,
+ target_freq, relation, &newstate))
+ return -EINVAL;
+
+ cris_freq_set_cpu_state(policy, newstate);
+
+ return 0;
+}
+
+static int cris_freq_cpu_init(struct cpufreq_policy *policy)
+{
+ int result;
+
+ /* cpuinfo and default policy values */
+ policy->cpuinfo.transition_latency = 1000000; /* 1ms */
+ policy->cur = cris_freq_get_cpu_frequency(0);
+
+ result = cpufreq_frequency_table_cpuinfo(policy, cris_freq_table);
+ if (result)
+ return (result);
+
+ cpufreq_frequency_table_get_attr(cris_freq_table, policy->cpu);
+
+ return 0;
+}
+
+
+static int cris_freq_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+
+static struct freq_attr *cris_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver cris_freq_driver = {
+ .get = cris_freq_get_cpu_frequency,
+ .verify = cris_freq_verify,
+ .target = cris_freq_target,
+ .init = cris_freq_cpu_init,
+ .exit = cris_freq_cpu_exit,
+ .name = "cris_freq",
+ .owner = THIS_MODULE,
+ .attr = cris_freq_attr,
+};
+
+static int __init cris_freq_init(void)
+{
+ int ret;
+ ret = cpufreq_register_driver(&cris_freq_driver);
+ cpufreq_register_notifier(&cris_sdram_freq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ return ret;
+}
+
+static int
+cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ int i;
+ struct cpufreq_freqs *freqs = data;
+ if (val == CPUFREQ_PRECHANGE) {
+ reg_ddr2_rw_cfg cfg =
+ REG_RD(ddr2, regi_ddr2_ctrl, rw_cfg);
+ cfg.ref_interval = (freqs->new == 200000 ? 1560 : 46);
+
+ if (freqs->new == 200000)
+ for (i = 0; i < 50000; i++);
+ REG_WR(bif_core, regi_bif_core, rw_sdram_timing, timing);
+ }
+ return 0;
+}
+
+
+module_init(cris_freq_init);
diff --git a/drivers/cpufreq/cris-etraxfs-cpufreq.c b/drivers/cpufreq/cris-etraxfs-cpufreq.c
new file mode 100644
index 000000000000..12952235d5db
--- /dev/null
+++ b/drivers/cpufreq/cris-etraxfs-cpufreq.c
@@ -0,0 +1,142 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpufreq.h>
+#include <hwregs/reg_map.h>
+#include <arch/hwregs/reg_rdwr.h>
+#include <arch/hwregs/config_defs.h>
+#include <arch/hwregs/bif_core_defs.h>
+
+static int
+cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data);
+
+static struct notifier_block cris_sdram_freq_notifier_block = {
+ .notifier_call = cris_sdram_freq_notifier
+};
+
+static struct cpufreq_frequency_table cris_freq_table[] = {
+ {0x01, 6000},
+ {0x02, 200000},
+ {0, CPUFREQ_TABLE_END},
+};
+
+static unsigned int cris_freq_get_cpu_frequency(unsigned int cpu)
+{
+ reg_config_rw_clk_ctrl clk_ctrl;
+ clk_ctrl = REG_RD(config, regi_config, rw_clk_ctrl);
+ return clk_ctrl.pll ? 200000 : 6000;
+}
+
+static void cris_freq_set_cpu_state(struct cpufreq_policy *policy,
+ unsigned int state)
+{
+ struct cpufreq_freqs freqs;
+ reg_config_rw_clk_ctrl clk_ctrl;
+ clk_ctrl = REG_RD(config, regi_config, rw_clk_ctrl);
+
+ freqs.old = cris_freq_get_cpu_frequency(policy->cpu);
+ freqs.new = cris_freq_table[state].frequency;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ local_irq_disable();
+
+ /* Even though we may be SMP they will share the same clock
+ * so all settings are made on CPU0. */
+ if (cris_freq_table[state].frequency == 200000)
+ clk_ctrl.pll = 1;
+ else
+ clk_ctrl.pll = 0;
+ REG_WR(config, regi_config, rw_clk_ctrl, clk_ctrl);
+
+ local_irq_enable();
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+};
+
+static int cris_freq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, &cris_freq_table[0]);
+}
+
+static int cris_freq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq, unsigned int relation)
+{
+ unsigned int newstate = 0;
+
+ if (cpufreq_frequency_table_target
+ (policy, cris_freq_table, target_freq, relation, &newstate))
+ return -EINVAL;
+
+ cris_freq_set_cpu_state(policy, newstate);
+
+ return 0;
+}
+
+static int cris_freq_cpu_init(struct cpufreq_policy *policy)
+{
+ int result;
+
+ /* cpuinfo and default policy values */
+ policy->cpuinfo.transition_latency = 1000000; /* 1ms */
+ policy->cur = cris_freq_get_cpu_frequency(0);
+
+ result = cpufreq_frequency_table_cpuinfo(policy, cris_freq_table);
+ if (result)
+ return (result);
+
+ cpufreq_frequency_table_get_attr(cris_freq_table, policy->cpu);
+
+ return 0;
+}
+
+static int cris_freq_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+static struct freq_attr *cris_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver cris_freq_driver = {
+ .get = cris_freq_get_cpu_frequency,
+ .verify = cris_freq_verify,
+ .target = cris_freq_target,
+ .init = cris_freq_cpu_init,
+ .exit = cris_freq_cpu_exit,
+ .name = "cris_freq",
+ .owner = THIS_MODULE,
+ .attr = cris_freq_attr,
+};
+
+static int __init cris_freq_init(void)
+{
+ int ret;
+ ret = cpufreq_register_driver(&cris_freq_driver);
+ cpufreq_register_notifier(&cris_sdram_freq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ return ret;
+}
+
+static int
+cris_sdram_freq_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ int i;
+ struct cpufreq_freqs *freqs = data;
+ if (val == CPUFREQ_PRECHANGE) {
+ reg_bif_core_rw_sdram_timing timing =
+ REG_RD(bif_core, regi_bif_core, rw_sdram_timing);
+ timing.cpd = (freqs->new == 200000 ? 0 : 1);
+
+ if (freqs->new == 200000)
+ for (i = 0; i < 50000; i++) ;
+ REG_WR(bif_core, regi_bif_core, rw_sdram_timing, timing);
+ }
+ return 0;
+}
+
+module_init(cris_freq_init);
diff --git a/drivers/cpufreq/davinci-cpufreq.c b/drivers/cpufreq/davinci-cpufreq.c
new file mode 100644
index 000000000000..c33c76c360fa
--- /dev/null
+++ b/drivers/cpufreq/davinci-cpufreq.c
@@ -0,0 +1,231 @@
+/*
+ * CPU frequency scaling for DaVinci
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Based on linux/arch/arm/plat-omap/cpu-omap.c. Original Copyright follows:
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Updated to support OMAP3
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/types.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/export.h>
+
+#include <mach/hardware.h>
+#include <mach/cpufreq.h>
+#include <mach/common.h>
+
+struct davinci_cpufreq {
+ struct device *dev;
+ struct clk *armclk;
+ struct clk *asyncclk;
+ unsigned long asyncrate;
+};
+static struct davinci_cpufreq cpufreq;
+
+static int davinci_verify_speed(struct cpufreq_policy *policy)
+{
+ struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data;
+ struct cpufreq_frequency_table *freq_table = pdata->freq_table;
+ struct clk *armclk = cpufreq.armclk;
+
+ if (freq_table)
+ return cpufreq_frequency_table_verify(policy, freq_table);
+
+ if (policy->cpu)
+ return -EINVAL;
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ policy->min = clk_round_rate(armclk, policy->min * 1000) / 1000;
+ policy->max = clk_round_rate(armclk, policy->max * 1000) / 1000;
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+ return 0;
+}
+
+static unsigned int davinci_getspeed(unsigned int cpu)
+{
+ if (cpu)
+ return 0;
+
+ return clk_get_rate(cpufreq.armclk) / 1000;
+}
+
+static int davinci_target(struct cpufreq_policy *policy,
+ unsigned int target_freq, unsigned int relation)
+{
+ int ret = 0;
+ unsigned int idx;
+ struct cpufreq_freqs freqs;
+ struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data;
+ struct clk *armclk = cpufreq.armclk;
+
+ freqs.old = davinci_getspeed(0);
+ freqs.new = clk_round_rate(armclk, target_freq * 1000) / 1000;
+
+ if (freqs.old == freqs.new)
+ return ret;
+
+ dev_dbg(cpufreq.dev, "transition: %u --> %u\n", freqs.old, freqs.new);
+
+ ret = cpufreq_frequency_table_target(policy, pdata->freq_table,
+ freqs.new, relation, &idx);
+ if (ret)
+ return -EINVAL;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ /* if moving to higher frequency, up the voltage beforehand */
+ if (pdata->set_voltage && freqs.new > freqs.old) {
+ ret = pdata->set_voltage(idx);
+ if (ret)
+ goto out;
+ }
+
+ ret = clk_set_rate(armclk, idx);
+ if (ret)
+ goto out;
+
+ if (cpufreq.asyncclk) {
+ ret = clk_set_rate(cpufreq.asyncclk, cpufreq.asyncrate);
+ if (ret)
+ goto out;
+ }
+
+ /* if moving to lower freq, lower the voltage after lowering freq */
+ if (pdata->set_voltage && freqs.new < freqs.old)
+ pdata->set_voltage(idx);
+
+out:
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return ret;
+}
+
+static int davinci_cpu_init(struct cpufreq_policy *policy)
+{
+ int result = 0;
+ struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data;
+ struct cpufreq_frequency_table *freq_table = pdata->freq_table;
+
+ if (policy->cpu != 0)
+ return -EINVAL;
+
+ /* Finish platform specific initialization */
+ if (pdata->init) {
+ result = pdata->init();
+ if (result)
+ return result;
+ }
+
+ policy->cur = davinci_getspeed(0);
+
+ result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
+ if (result) {
+ pr_err("%s: cpufreq_frequency_table_cpuinfo() failed",
+ __func__);
+ return result;
+ }
+
+ cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
+
+ /*
+ * Time measurement across the target() function yields ~1500-1800us
+ * time taken with no drivers on notification list.
+ * Setting the latency to 2000 us to accommodate addition of drivers
+ * to pre/post change notification list.
+ */
+ policy->cpuinfo.transition_latency = 2000 * 1000;
+ return 0;
+}
+
+static int davinci_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+static struct freq_attr *davinci_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver davinci_driver = {
+ .flags = CPUFREQ_STICKY,
+ .verify = davinci_verify_speed,
+ .target = davinci_target,
+ .get = davinci_getspeed,
+ .init = davinci_cpu_init,
+ .exit = davinci_cpu_exit,
+ .name = "davinci",
+ .attr = davinci_cpufreq_attr,
+};
+
+static int __init davinci_cpufreq_probe(struct platform_device *pdev)
+{
+ struct davinci_cpufreq_config *pdata = pdev->dev.platform_data;
+ struct clk *asyncclk;
+
+ if (!pdata)
+ return -EINVAL;
+ if (!pdata->freq_table)
+ return -EINVAL;
+
+ cpufreq.dev = &pdev->dev;
+
+ cpufreq.armclk = clk_get(NULL, "arm");
+ if (IS_ERR(cpufreq.armclk)) {
+ dev_err(cpufreq.dev, "Unable to get ARM clock\n");
+ return PTR_ERR(cpufreq.armclk);
+ }
+
+ asyncclk = clk_get(cpufreq.dev, "async");
+ if (!IS_ERR(asyncclk)) {
+ cpufreq.asyncclk = asyncclk;
+ cpufreq.asyncrate = clk_get_rate(asyncclk);
+ }
+
+ return cpufreq_register_driver(&davinci_driver);
+}
+
+static int __exit davinci_cpufreq_remove(struct platform_device *pdev)
+{
+ clk_put(cpufreq.armclk);
+
+ if (cpufreq.asyncclk)
+ clk_put(cpufreq.asyncclk);
+
+ return cpufreq_unregister_driver(&davinci_driver);
+}
+
+static struct platform_driver davinci_cpufreq_driver = {
+ .driver = {
+ .name = "cpufreq-davinci",
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(davinci_cpufreq_remove),
+};
+
+int __init davinci_cpufreq_init(void)
+{
+ return platform_driver_probe(&davinci_cpufreq_driver,
+ davinci_cpufreq_probe);
+}
+
diff --git a/drivers/cpufreq/dbx500-cpufreq.c b/drivers/cpufreq/dbx500-cpufreq.c
index 72f0c3efa76e..6ec6539ae041 100644
--- a/drivers/cpufreq/dbx500-cpufreq.c
+++ b/drivers/cpufreq/dbx500-cpufreq.c
@@ -37,12 +37,6 @@ static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
unsigned int idx;
int ret;
- /* scale the target frequency to one of the extremes supported */
- if (target_freq < policy->cpuinfo.min_freq)
- target_freq = policy->cpuinfo.min_freq;
- if (target_freq > policy->cpuinfo.max_freq)
- target_freq = policy->cpuinfo.max_freq;
-
/* Lookup the next frequency */
if (cpufreq_frequency_table_target(policy, freq_table, target_freq,
relation, &idx))
@@ -55,8 +49,7 @@ static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
return 0;
/* pre-change notification */
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* update armss clk frequency */
ret = clk_set_rate(armss_clk, freqs.new * 1000);
@@ -68,8 +61,7 @@ static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
}
/* post change notification */
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
@@ -79,15 +71,15 @@ static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
int i = 0;
unsigned long freq = clk_get_rate(armss_clk) / 1000;
- while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
- if (freq <= freq_table[i].frequency)
+ /* The value is rounded to closest frequency in the defined table. */
+ while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) {
+ if (freq < freq_table[i].frequency +
+ (freq_table[i + 1].frequency - freq_table[i].frequency) / 2)
return freq_table[i].frequency;
i++;
}
- /* We could not find a corresponding frequency. */
- pr_err("dbx500-cpufreq: Failed to find cpufreq speed\n");
- return 0;
+ return freq_table[i].frequency;
}
static int __cpuinit dbx500_cpufreq_init(struct cpufreq_policy *policy)
diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
index 3fffbe6025cd..37380fb92621 100644
--- a/drivers/cpufreq/e_powersaver.c
+++ b/drivers/cpufreq/e_powersaver.c
@@ -104,7 +104,7 @@ static unsigned int eps_get(unsigned int cpu)
}
static int eps_set_state(struct eps_cpu_data *centaur,
- unsigned int cpu,
+ struct cpufreq_policy *policy,
u32 dest_state)
{
struct cpufreq_freqs freqs;
@@ -112,10 +112,9 @@ static int eps_set_state(struct eps_cpu_data *centaur,
int err = 0;
int i;
- freqs.old = eps_get(cpu);
+ freqs.old = eps_get(policy->cpu);
freqs.new = centaur->fsb * ((dest_state >> 8) & 0xff);
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Wait while CPU is busy */
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
@@ -162,7 +161,7 @@ postchange:
current_multiplier);
}
#endif
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return err;
}
@@ -190,7 +189,7 @@ static int eps_target(struct cpufreq_policy *policy,
/* Make frequency transition */
dest_state = centaur->freq_table[newstate].index & 0xffff;
- ret = eps_set_state(centaur, cpu, dest_state);
+ ret = eps_set_state(centaur, policy, dest_state);
if (ret)
printk(KERN_ERR "eps: Timeout!\n");
return ret;
diff --git a/drivers/cpufreq/elanfreq.c b/drivers/cpufreq/elanfreq.c
index 960671fd3d7e..658d860344b0 100644
--- a/drivers/cpufreq/elanfreq.c
+++ b/drivers/cpufreq/elanfreq.c
@@ -117,15 +117,15 @@ static unsigned int elanfreq_get_cpu_frequency(unsigned int cpu)
* There is no return value.
*/
-static void elanfreq_set_cpu_state(unsigned int state)
+static void elanfreq_set_cpu_state(struct cpufreq_policy *policy,
+ unsigned int state)
{
struct cpufreq_freqs freqs;
freqs.old = elanfreq_get_cpu_frequency(0);
freqs.new = elan_multiplier[state].clock;
- freqs.cpu = 0; /* elanfreq.c is UP only driver */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
printk(KERN_INFO "elanfreq: attempting to set frequency to %i kHz\n",
elan_multiplier[state].clock);
@@ -161,7 +161,7 @@ static void elanfreq_set_cpu_state(unsigned int state)
udelay(10000);
local_irq_enable();
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
};
@@ -188,7 +188,7 @@ static int elanfreq_target(struct cpufreq_policy *policy,
target_freq, relation, &newstate))
return -EINVAL;
- elanfreq_set_cpu_state(newstate);
+ elanfreq_set_cpu_state(policy, newstate);
return 0;
}
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 78057a357ddb..475b4f607f0d 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -70,7 +70,6 @@ static int exynos_cpufreq_scale(unsigned int target_freq)
freqs.old = policy->cur;
freqs.new = target_freq;
- freqs.cpu = policy->cpu;
if (freqs.new == freqs.old)
goto out;
@@ -105,8 +104,7 @@ static int exynos_cpufreq_scale(unsigned int target_freq)
}
arm_volt = volt_table[index];
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* When the new frequency is higher than current frequency */
if ((freqs.new > freqs.old) && !safe_arm_volt) {
@@ -131,8 +129,7 @@ static int exynos_cpufreq_scale(unsigned int target_freq)
exynos_info->set_freq(old_index, index);
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
/* When the new frequency is lower than current frequency */
if ((freqs.new < freqs.old) ||
@@ -297,7 +294,7 @@ static int __init exynos_cpufreq_init(void)
else if (soc_is_exynos5250())
ret = exynos5250_cpufreq_init(exynos_info);
else
- pr_err("%s: CPU type not found\n", __func__);
+ return 0;
if (ret)
goto err_vdd_arm;
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
new file mode 100644
index 000000000000..0c74018eda47
--- /dev/null
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -0,0 +1,481 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Amit Daniel Kachhap <amit.daniel@samsung.com>
+ *
+ * EXYNOS5440 - CPU frequency scaling support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/opp.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Register definitions */
+#define XMU_DVFS_CTRL 0x0060
+#define XMU_PMU_P0_7 0x0064
+#define XMU_C0_3_PSTATE 0x0090
+#define XMU_P_LIMIT 0x00a0
+#define XMU_P_STATUS 0x00a4
+#define XMU_PMUEVTEN 0x00d0
+#define XMU_PMUIRQEN 0x00d4
+#define XMU_PMUIRQ 0x00d8
+
+/* PMU mask and shift definations */
+#define P_VALUE_MASK 0x7
+
+#define XMU_DVFS_CTRL_EN_SHIFT 0
+
+#define P0_7_CPUCLKDEV_SHIFT 21
+#define P0_7_CPUCLKDEV_MASK 0x7
+#define P0_7_ATBCLKDEV_SHIFT 18
+#define P0_7_ATBCLKDEV_MASK 0x7
+#define P0_7_CSCLKDEV_SHIFT 15
+#define P0_7_CSCLKDEV_MASK 0x7
+#define P0_7_CPUEMA_SHIFT 28
+#define P0_7_CPUEMA_MASK 0xf
+#define P0_7_L2EMA_SHIFT 24
+#define P0_7_L2EMA_MASK 0xf
+#define P0_7_VDD_SHIFT 8
+#define P0_7_VDD_MASK 0x7f
+#define P0_7_FREQ_SHIFT 0
+#define P0_7_FREQ_MASK 0xff
+
+#define C0_3_PSTATE_VALID_SHIFT 8
+#define C0_3_PSTATE_CURR_SHIFT 4
+#define C0_3_PSTATE_NEW_SHIFT 0
+
+#define PSTATE_CHANGED_EVTEN_SHIFT 0
+
+#define PSTATE_CHANGED_IRQEN_SHIFT 0
+
+#define PSTATE_CHANGED_SHIFT 0
+
+/* some constant values for clock divider calculation */
+#define CPU_DIV_FREQ_MAX 500
+#define CPU_DBG_FREQ_MAX 375
+#define CPU_ATB_FREQ_MAX 500
+
+#define PMIC_LOW_VOLT 0x30
+#define PMIC_HIGH_VOLT 0x28
+
+#define CPUEMA_HIGH 0x2
+#define CPUEMA_MID 0x4
+#define CPUEMA_LOW 0x7
+
+#define L2EMA_HIGH 0x1
+#define L2EMA_MID 0x3
+#define L2EMA_LOW 0x4
+
+#define DIV_TAB_MAX 2
+/* frequency unit is 20MHZ */
+#define FREQ_UNIT 20
+#define MAX_VOLTAGE 1550000 /* In microvolt */
+#define VOLTAGE_STEP 12500 /* In microvolt */
+
+#define CPUFREQ_NAME "exynos5440_dvfs"
+#define DEF_TRANS_LATENCY 100000
+
+enum cpufreq_level_index {
+ L0, L1, L2, L3, L4,
+ L5, L6, L7, L8, L9,
+};
+#define CPUFREQ_LEVEL_END (L7 + 1)
+
+struct exynos_dvfs_data {
+ void __iomem *base;
+ struct resource *mem;
+ int irq;
+ struct clk *cpu_clk;
+ unsigned int cur_frequency;
+ unsigned int latency;
+ struct cpufreq_frequency_table *freq_table;
+ unsigned int freq_count;
+ struct device *dev;
+ bool dvfs_enabled;
+ struct work_struct irq_work;
+};
+
+static struct exynos_dvfs_data *dvfs_info;
+static DEFINE_MUTEX(cpufreq_lock);
+static struct cpufreq_freqs freqs;
+
+static int init_div_table(void)
+{
+ struct cpufreq_frequency_table *freq_tbl = dvfs_info->freq_table;
+ unsigned int tmp, clk_div, ema_div, freq, volt_id;
+ int i = 0;
+ struct opp *opp;
+
+ rcu_read_lock();
+ for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
+
+ opp = opp_find_freq_exact(dvfs_info->dev,
+ freq_tbl[i].frequency * 1000, true);
+ if (IS_ERR(opp)) {
+ rcu_read_unlock();
+ dev_err(dvfs_info->dev,
+ "failed to find valid OPP for %u KHZ\n",
+ freq_tbl[i].frequency);
+ return PTR_ERR(opp);
+ }
+
+ freq = freq_tbl[i].frequency / 1000; /* In MHZ */
+ clk_div = ((freq / CPU_DIV_FREQ_MAX) & P0_7_CPUCLKDEV_MASK)
+ << P0_7_CPUCLKDEV_SHIFT;
+ clk_div |= ((freq / CPU_ATB_FREQ_MAX) & P0_7_ATBCLKDEV_MASK)
+ << P0_7_ATBCLKDEV_SHIFT;
+ clk_div |= ((freq / CPU_DBG_FREQ_MAX) & P0_7_CSCLKDEV_MASK)
+ << P0_7_CSCLKDEV_SHIFT;
+
+ /* Calculate EMA */
+ volt_id = opp_get_voltage(opp);
+ volt_id = (MAX_VOLTAGE - volt_id) / VOLTAGE_STEP;
+ if (volt_id < PMIC_HIGH_VOLT) {
+ ema_div = (CPUEMA_HIGH << P0_7_CPUEMA_SHIFT) |
+ (L2EMA_HIGH << P0_7_L2EMA_SHIFT);
+ } else if (volt_id > PMIC_LOW_VOLT) {
+ ema_div = (CPUEMA_LOW << P0_7_CPUEMA_SHIFT) |
+ (L2EMA_LOW << P0_7_L2EMA_SHIFT);
+ } else {
+ ema_div = (CPUEMA_MID << P0_7_CPUEMA_SHIFT) |
+ (L2EMA_MID << P0_7_L2EMA_SHIFT);
+ }
+
+ tmp = (clk_div | ema_div | (volt_id << P0_7_VDD_SHIFT)
+ | ((freq / FREQ_UNIT) << P0_7_FREQ_SHIFT));
+
+ __raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
+ }
+
+ rcu_read_unlock();
+ return 0;
+}
+
+static void exynos_enable_dvfs(void)
+{
+ unsigned int tmp, i, cpu;
+ struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+ /* Disable DVFS */
+ __raw_writel(0, dvfs_info->base + XMU_DVFS_CTRL);
+
+ /* Enable PSTATE Change Event */
+ tmp = __raw_readl(dvfs_info->base + XMU_PMUEVTEN);
+ tmp |= (1 << PSTATE_CHANGED_EVTEN_SHIFT);
+ __raw_writel(tmp, dvfs_info->base + XMU_PMUEVTEN);
+
+ /* Enable PSTATE Change IRQ */
+ tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQEN);
+ tmp |= (1 << PSTATE_CHANGED_IRQEN_SHIFT);
+ __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQEN);
+
+ /* Set initial performance index */
+ for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
+ if (freq_table[i].frequency == dvfs_info->cur_frequency)
+ break;
+
+ if (freq_table[i].frequency == CPUFREQ_TABLE_END) {
+ dev_crit(dvfs_info->dev, "Boot up frequency not supported\n");
+ /* Assign the highest frequency */
+ i = 0;
+ dvfs_info->cur_frequency = freq_table[i].frequency;
+ }
+
+ dev_info(dvfs_info->dev, "Setting dvfs initial frequency = %uKHZ",
+ dvfs_info->cur_frequency);
+
+ for (cpu = 0; cpu < CONFIG_NR_CPUS; cpu++) {
+ tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
+ tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
+ tmp |= (i << C0_3_PSTATE_NEW_SHIFT);
+ __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
+ }
+
+ /* Enable DVFS */
+ __raw_writel(1 << XMU_DVFS_CTRL_EN_SHIFT,
+ dvfs_info->base + XMU_DVFS_CTRL);
+}
+
+static int exynos_verify_speed(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy,
+ dvfs_info->freq_table);
+}
+
+static unsigned int exynos_getspeed(unsigned int cpu)
+{
+ return dvfs_info->cur_frequency;
+}
+
+static int exynos_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int index, tmp;
+ int ret = 0, i;
+ struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+
+ mutex_lock(&cpufreq_lock);
+
+ ret = cpufreq_frequency_table_target(policy, freq_table,
+ target_freq, relation, &index);
+ if (ret)
+ goto out;
+
+ freqs.old = dvfs_info->cur_frequency;
+ freqs.new = freq_table[index].frequency;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ /* Set the target frequency in all C0_3_PSTATE register */
+ for_each_cpu(i, policy->cpus) {
+ tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
+ tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
+ tmp |= (index << C0_3_PSTATE_NEW_SHIFT);
+
+ __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
+ }
+out:
+ mutex_unlock(&cpufreq_lock);
+ return ret;
+}
+
+static void exynos_cpufreq_work(struct work_struct *work)
+{
+ unsigned int cur_pstate, index;
+ struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
+ struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+
+ /* Ensure we can access cpufreq structures */
+ if (unlikely(dvfs_info->dvfs_enabled == false))
+ goto skip_work;
+
+ mutex_lock(&cpufreq_lock);
+ freqs.old = dvfs_info->cur_frequency;
+
+ cur_pstate = __raw_readl(dvfs_info->base + XMU_P_STATUS);
+ if (cur_pstate >> C0_3_PSTATE_VALID_SHIFT & 0x1)
+ index = (cur_pstate >> C0_3_PSTATE_CURR_SHIFT) & P_VALUE_MASK;
+ else
+ index = (cur_pstate >> C0_3_PSTATE_NEW_SHIFT) & P_VALUE_MASK;
+
+ if (likely(index < dvfs_info->freq_count)) {
+ freqs.new = freq_table[index].frequency;
+ dvfs_info->cur_frequency = freqs.new;
+ } else {
+ dev_crit(dvfs_info->dev, "New frequency out of range\n");
+ freqs.new = dvfs_info->cur_frequency;
+ }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ cpufreq_cpu_put(policy);
+ mutex_unlock(&cpufreq_lock);
+skip_work:
+ enable_irq(dvfs_info->irq);
+}
+
+static irqreturn_t exynos_cpufreq_irq(int irq, void *id)
+{
+ unsigned int tmp;
+
+ tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQ);
+ if (tmp >> PSTATE_CHANGED_SHIFT & 0x1) {
+ __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQ);
+ disable_irq_nosync(irq);
+ schedule_work(&dvfs_info->irq_work);
+ }
+ return IRQ_HANDLED;
+}
+
+static void exynos_sort_descend_freq_table(void)
+{
+ struct cpufreq_frequency_table *freq_tbl = dvfs_info->freq_table;
+ int i = 0, index;
+ unsigned int tmp_freq;
+ /*
+ * Exynos5440 clock controller state logic expects the cpufreq table to
+ * be in descending order. But the OPP library constructs the table in
+ * ascending order. So to make the table descending we just need to
+ * swap the i element with the N - i element.
+ */
+ for (i = 0; i < dvfs_info->freq_count / 2; i++) {
+ index = dvfs_info->freq_count - i - 1;
+ tmp_freq = freq_tbl[i].frequency;
+ freq_tbl[i].frequency = freq_tbl[index].frequency;
+ freq_tbl[index].frequency = tmp_freq;
+ }
+}
+
+static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ int ret;
+
+ ret = cpufreq_frequency_table_cpuinfo(policy, dvfs_info->freq_table);
+ if (ret) {
+ dev_err(dvfs_info->dev, "Invalid frequency table: %d\n", ret);
+ return ret;
+ }
+
+ policy->cur = dvfs_info->cur_frequency;
+ policy->cpuinfo.transition_latency = dvfs_info->latency;
+ cpumask_setall(policy->cpus);
+
+ cpufreq_frequency_table_get_attr(dvfs_info->freq_table, policy->cpu);
+
+ return 0;
+}
+
+static struct cpufreq_driver exynos_driver = {
+ .flags = CPUFREQ_STICKY,
+ .verify = exynos_verify_speed,
+ .target = exynos_target,
+ .get = exynos_getspeed,
+ .init = exynos_cpufreq_cpu_init,
+ .name = CPUFREQ_NAME,
+};
+
+static const struct of_device_id exynos_cpufreq_match[] = {
+ {
+ .compatible = "samsung,exynos5440-cpufreq",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, exynos_cpufreq_match);
+
+static int exynos_cpufreq_probe(struct platform_device *pdev)
+{
+ int ret = -EINVAL;
+ struct device_node *np;
+ struct resource res;
+
+ np = pdev->dev.of_node;
+ if (!np)
+ return -ENODEV;
+
+ dvfs_info = devm_kzalloc(&pdev->dev, sizeof(*dvfs_info), GFP_KERNEL);
+ if (!dvfs_info) {
+ ret = -ENOMEM;
+ goto err_put_node;
+ }
+
+ dvfs_info->dev = &pdev->dev;
+
+ ret = of_address_to_resource(np, 0, &res);
+ if (ret)
+ goto err_put_node;
+
+ dvfs_info->base = devm_ioremap_resource(dvfs_info->dev, &res);
+ if (IS_ERR(dvfs_info->base)) {
+ ret = PTR_ERR(dvfs_info->base);
+ goto err_put_node;
+ }
+
+ dvfs_info->irq = irq_of_parse_and_map(np, 0);
+ if (!dvfs_info->irq) {
+ dev_err(dvfs_info->dev, "No cpufreq irq found\n");
+ ret = -ENODEV;
+ goto err_put_node;
+ }
+
+ ret = of_init_opp_table(dvfs_info->dev);
+ if (ret) {
+ dev_err(dvfs_info->dev, "failed to init OPP table: %d\n", ret);
+ goto err_put_node;
+ }
+
+ ret = opp_init_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+ if (ret) {
+ dev_err(dvfs_info->dev,
+ "failed to init cpufreq table: %d\n", ret);
+ goto err_put_node;
+ }
+ dvfs_info->freq_count = opp_get_opp_count(dvfs_info->dev);
+ exynos_sort_descend_freq_table();
+
+ if (of_property_read_u32(np, "clock-latency", &dvfs_info->latency))
+ dvfs_info->latency = DEF_TRANS_LATENCY;
+
+ dvfs_info->cpu_clk = devm_clk_get(dvfs_info->dev, "armclk");
+ if (IS_ERR(dvfs_info->cpu_clk)) {
+ dev_err(dvfs_info->dev, "Failed to get cpu clock\n");
+ ret = PTR_ERR(dvfs_info->cpu_clk);
+ goto err_free_table;
+ }
+
+ dvfs_info->cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
+ if (!dvfs_info->cur_frequency) {
+ dev_err(dvfs_info->dev, "Failed to get clock rate\n");
+ ret = -EINVAL;
+ goto err_free_table;
+ }
+ dvfs_info->cur_frequency /= 1000;
+
+ INIT_WORK(&dvfs_info->irq_work, exynos_cpufreq_work);
+ ret = devm_request_irq(dvfs_info->dev, dvfs_info->irq,
+ exynos_cpufreq_irq, IRQF_TRIGGER_NONE,
+ CPUFREQ_NAME, dvfs_info);
+ if (ret) {
+ dev_err(dvfs_info->dev, "Failed to register IRQ\n");
+ goto err_free_table;
+ }
+
+ ret = init_div_table();
+ if (ret) {
+ dev_err(dvfs_info->dev, "Failed to initialise div table\n");
+ goto err_free_table;
+ }
+
+ exynos_enable_dvfs();
+ ret = cpufreq_register_driver(&exynos_driver);
+ if (ret) {
+ dev_err(dvfs_info->dev,
+ "%s: failed to register cpufreq driver\n", __func__);
+ goto err_free_table;
+ }
+
+ of_node_put(np);
+ dvfs_info->dvfs_enabled = true;
+ return 0;
+
+err_free_table:
+ opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+err_put_node:
+ of_node_put(np);
+ dev_err(dvfs_info->dev, "%s: failed initialization\n", __func__);
+ return ret;
+}
+
+static int exynos_cpufreq_remove(struct platform_device *pdev)
+{
+ cpufreq_unregister_driver(&exynos_driver);
+ opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+ return 0;
+}
+
+static struct platform_driver exynos_cpufreq_platdrv = {
+ .driver = {
+ .name = "exynos5440-cpufreq",
+ .owner = THIS_MODULE,
+ .of_match_table = exynos_cpufreq_match,
+ },
+ .probe = exynos_cpufreq_probe,
+ .remove = exynos_cpufreq_remove,
+};
+module_platform_driver(exynos_cpufreq_platdrv);
+
+MODULE_AUTHOR("Amit Daniel Kachhap <amit.daniel@samsung.com>");
+MODULE_DESCRIPTION("Exynos5440 cpufreq driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/gx-suspmod.c b/drivers/cpufreq/gx-suspmod.c
index 456bee058fe6..3dfc99b9ca86 100644
--- a/drivers/cpufreq/gx-suspmod.c
+++ b/drivers/cpufreq/gx-suspmod.c
@@ -251,14 +251,13 @@ static unsigned int gx_validate_speed(unsigned int khz, u8 *on_duration,
* set cpu speed in khz.
**/
-static void gx_set_cpuspeed(unsigned int khz)
+static void gx_set_cpuspeed(struct cpufreq_policy *policy, unsigned int khz)
{
u8 suscfg, pmer1;
unsigned int new_khz;
unsigned long flags;
struct cpufreq_freqs freqs;
- freqs.cpu = 0;
freqs.old = gx_get_cpuspeed(0);
new_khz = gx_validate_speed(khz, &gx_params->on_duration,
@@ -266,11 +265,9 @@ static void gx_set_cpuspeed(unsigned int khz)
freqs.new = new_khz;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
local_irq_save(flags);
-
-
if (new_khz != stock_freq) {
/* if new khz == 100% of CPU speed, it is special case */
switch (gx_params->cs55x0->device) {
@@ -317,7 +314,7 @@ static void gx_set_cpuspeed(unsigned int khz)
gx_params->pci_suscfg = suscfg;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
pr_debug("suspend modulation w/ duration of ON:%d us, OFF:%d us\n",
gx_params->on_duration * 32, gx_params->off_duration * 32);
@@ -397,7 +394,7 @@ static int cpufreq_gx_target(struct cpufreq_policy *policy,
tmp_freq = gx_validate_speed(tmp_freq, &tmp1, &tmp2);
}
- gx_set_cpuspeed(tmp_freq);
+ gx_set_cpuspeed(policy, tmp_freq);
return 0;
}
diff --git a/drivers/cpufreq/ia64-acpi-cpufreq.c b/drivers/cpufreq/ia64-acpi-cpufreq.c
new file mode 100644
index 000000000000..c0075dbaa633
--- /dev/null
+++ b/drivers/cpufreq/ia64-acpi-cpufreq.c
@@ -0,0 +1,438 @@
+/*
+ * This file provides the ACPI based P-state support. This
+ * module works with generic cpufreq infrastructure. Most of
+ * the code is based on i386 version
+ * (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
+ *
+ * Copyright (C) 2005 Intel Corp
+ * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/pal.h>
+
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+
+MODULE_AUTHOR("Venkatesh Pallipadi");
+MODULE_DESCRIPTION("ACPI Processor P-States Driver");
+MODULE_LICENSE("GPL");
+
+
+struct cpufreq_acpi_io {
+ struct acpi_processor_performance acpi_data;
+ struct cpufreq_frequency_table *freq_table;
+ unsigned int resume;
+};
+
+static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS];
+
+static struct cpufreq_driver acpi_cpufreq_driver;
+
+
+static int
+processor_set_pstate (
+ u32 value)
+{
+ s64 retval;
+
+ pr_debug("processor_set_pstate\n");
+
+ retval = ia64_pal_set_pstate((u64)value);
+
+ if (retval) {
+ pr_debug("Failed to set freq to 0x%x, with error 0x%lx\n",
+ value, retval);
+ return -ENODEV;
+ }
+ return (int)retval;
+}
+
+
+static int
+processor_get_pstate (
+ u32 *value)
+{
+ u64 pstate_index = 0;
+ s64 retval;
+
+ pr_debug("processor_get_pstate\n");
+
+ retval = ia64_pal_get_pstate(&pstate_index,
+ PAL_GET_PSTATE_TYPE_INSTANT);
+ *value = (u32) pstate_index;
+
+ if (retval)
+ pr_debug("Failed to get current freq with "
+ "error 0x%lx, idx 0x%x\n", retval, *value);
+
+ return (int)retval;
+}
+
+
+/* To be used only after data->acpi_data is initialized */
+static unsigned
+extract_clock (
+ struct cpufreq_acpi_io *data,
+ unsigned value,
+ unsigned int cpu)
+{
+ unsigned long i;
+
+ pr_debug("extract_clock\n");
+
+ for (i = 0; i < data->acpi_data.state_count; i++) {
+ if (value == data->acpi_data.states[i].status)
+ return data->acpi_data.states[i].core_frequency;
+ }
+ return data->acpi_data.states[i-1].core_frequency;
+}
+
+
+static unsigned int
+processor_get_freq (
+ struct cpufreq_acpi_io *data,
+ unsigned int cpu)
+{
+ int ret = 0;
+ u32 value = 0;
+ cpumask_t saved_mask;
+ unsigned long clock_freq;
+
+ pr_debug("processor_get_freq\n");
+
+ saved_mask = current->cpus_allowed;
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+ if (smp_processor_id() != cpu)
+ goto migrate_end;
+
+ /* processor_get_pstate gets the instantaneous frequency */
+ ret = processor_get_pstate(&value);
+
+ if (ret) {
+ set_cpus_allowed_ptr(current, &saved_mask);
+ printk(KERN_WARNING "get performance failed with error %d\n",
+ ret);
+ ret = 0;
+ goto migrate_end;
+ }
+ clock_freq = extract_clock(data, value, cpu);
+ ret = (clock_freq*1000);
+
+migrate_end:
+ set_cpus_allowed_ptr(current, &saved_mask);
+ return ret;
+}
+
+
+static int
+processor_set_freq (
+ struct cpufreq_acpi_io *data,
+ struct cpufreq_policy *policy,
+ int state)
+{
+ int ret = 0;
+ u32 value = 0;
+ struct cpufreq_freqs cpufreq_freqs;
+ cpumask_t saved_mask;
+ int retval;
+
+ pr_debug("processor_set_freq\n");
+
+ saved_mask = current->cpus_allowed;
+ set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
+ if (smp_processor_id() != policy->cpu) {
+ retval = -EAGAIN;
+ goto migrate_end;
+ }
+
+ if (state == data->acpi_data.state) {
+ if (unlikely(data->resume)) {
+ pr_debug("Called after resume, resetting to P%d\n", state);
+ data->resume = 0;
+ } else {
+ pr_debug("Already at target state (P%d)\n", state);
+ retval = 0;
+ goto migrate_end;
+ }
+ }
+
+ pr_debug("Transitioning from P%d to P%d\n",
+ data->acpi_data.state, state);
+
+ /* cpufreq frequency struct */
+ cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
+ cpufreq_freqs.new = data->freq_table[state].frequency;
+
+ /* notify cpufreq */
+ cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_PRECHANGE);
+
+ /*
+ * First we write the target state's 'control' value to the
+ * control_register.
+ */
+
+ value = (u32) data->acpi_data.states[state].control;
+
+ pr_debug("Transitioning to state: 0x%08x\n", value);
+
+ ret = processor_set_pstate(value);
+ if (ret) {
+ unsigned int tmp = cpufreq_freqs.new;
+ cpufreq_notify_transition(policy, &cpufreq_freqs,
+ CPUFREQ_POSTCHANGE);
+ cpufreq_freqs.new = cpufreq_freqs.old;
+ cpufreq_freqs.old = tmp;
+ cpufreq_notify_transition(policy, &cpufreq_freqs,
+ CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &cpufreq_freqs,
+ CPUFREQ_POSTCHANGE);
+ printk(KERN_WARNING "Transition failed with error %d\n", ret);
+ retval = -ENODEV;
+ goto migrate_end;
+ }
+
+ cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_POSTCHANGE);
+
+ data->acpi_data.state = state;
+
+ retval = 0;
+
+migrate_end:
+ set_cpus_allowed_ptr(current, &saved_mask);
+ return (retval);
+}
+
+
+static unsigned int
+acpi_cpufreq_get (
+ unsigned int cpu)
+{
+ struct cpufreq_acpi_io *data = acpi_io_data[cpu];
+
+ pr_debug("acpi_cpufreq_get\n");
+
+ return processor_get_freq(data, cpu);
+}
+
+
+static int
+acpi_cpufreq_target (
+ struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+ unsigned int next_state = 0;
+ unsigned int result = 0;
+
+ pr_debug("acpi_cpufreq_setpolicy\n");
+
+ result = cpufreq_frequency_table_target(policy,
+ data->freq_table, target_freq, relation, &next_state);
+ if (result)
+ return (result);
+
+ result = processor_set_freq(data, policy, next_state);
+
+ return (result);
+}
+
+
+static int
+acpi_cpufreq_verify (
+ struct cpufreq_policy *policy)
+{
+ unsigned int result = 0;
+ struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+
+ pr_debug("acpi_cpufreq_verify\n");
+
+ result = cpufreq_frequency_table_verify(policy,
+ data->freq_table);
+
+ return (result);
+}
+
+
+static int
+acpi_cpufreq_cpu_init (
+ struct cpufreq_policy *policy)
+{
+ unsigned int i;
+ unsigned int cpu = policy->cpu;
+ struct cpufreq_acpi_io *data;
+ unsigned int result = 0;
+
+ pr_debug("acpi_cpufreq_cpu_init\n");
+
+ data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
+ if (!data)
+ return (-ENOMEM);
+
+ acpi_io_data[cpu] = data;
+
+ result = acpi_processor_register_performance(&data->acpi_data, cpu);
+
+ if (result)
+ goto err_free;
+
+ /* capability check */
+ if (data->acpi_data.state_count <= 1) {
+ pr_debug("No P-States\n");
+ result = -ENODEV;
+ goto err_unreg;
+ }
+
+ if ((data->acpi_data.control_register.space_id !=
+ ACPI_ADR_SPACE_FIXED_HARDWARE) ||
+ (data->acpi_data.status_register.space_id !=
+ ACPI_ADR_SPACE_FIXED_HARDWARE)) {
+ pr_debug("Unsupported address space [%d, %d]\n",
+ (u32) (data->acpi_data.control_register.space_id),
+ (u32) (data->acpi_data.status_register.space_id));
+ result = -ENODEV;
+ goto err_unreg;
+ }
+
+ /* alloc freq_table */
+ data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
+ (data->acpi_data.state_count + 1),
+ GFP_KERNEL);
+ if (!data->freq_table) {
+ result = -ENOMEM;
+ goto err_unreg;
+ }
+
+ /* detect transition latency */
+ policy->cpuinfo.transition_latency = 0;
+ for (i=0; i<data->acpi_data.state_count; i++) {
+ if ((data->acpi_data.states[i].transition_latency * 1000) >
+ policy->cpuinfo.transition_latency) {
+ policy->cpuinfo.transition_latency =
+ data->acpi_data.states[i].transition_latency * 1000;
+ }
+ }
+ policy->cur = processor_get_freq(data, policy->cpu);
+
+ /* table init */
+ for (i = 0; i <= data->acpi_data.state_count; i++)
+ {
+ data->freq_table[i].index = i;
+ if (i < data->acpi_data.state_count) {
+ data->freq_table[i].frequency =
+ data->acpi_data.states[i].core_frequency * 1000;
+ } else {
+ data->freq_table[i].frequency = CPUFREQ_TABLE_END;
+ }
+ }
+
+ result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
+ if (result) {
+ goto err_freqfree;
+ }
+
+ /* notify BIOS that we exist */
+ acpi_processor_notify_smm(THIS_MODULE);
+
+ printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management "
+ "activated.\n", cpu);
+
+ for (i = 0; i < data->acpi_data.state_count; i++)
+ pr_debug(" %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n",
+ (i == data->acpi_data.state?'*':' '), i,
+ (u32) data->acpi_data.states[i].core_frequency,
+ (u32) data->acpi_data.states[i].power,
+ (u32) data->acpi_data.states[i].transition_latency,
+ (u32) data->acpi_data.states[i].bus_master_latency,
+ (u32) data->acpi_data.states[i].status,
+ (u32) data->acpi_data.states[i].control);
+
+ cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
+
+ /* the first call to ->target() should result in us actually
+ * writing something to the appropriate registers. */
+ data->resume = 1;
+
+ return (result);
+
+ err_freqfree:
+ kfree(data->freq_table);
+ err_unreg:
+ acpi_processor_unregister_performance(&data->acpi_data, cpu);
+ err_free:
+ kfree(data);
+ acpi_io_data[cpu] = NULL;
+
+ return (result);
+}
+
+
+static int
+acpi_cpufreq_cpu_exit (
+ struct cpufreq_policy *policy)
+{
+ struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
+
+ pr_debug("acpi_cpufreq_cpu_exit\n");
+
+ if (data) {
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ acpi_io_data[policy->cpu] = NULL;
+ acpi_processor_unregister_performance(&data->acpi_data,
+ policy->cpu);
+ kfree(data);
+ }
+
+ return (0);
+}
+
+
+static struct freq_attr* acpi_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+
+static struct cpufreq_driver acpi_cpufreq_driver = {
+ .verify = acpi_cpufreq_verify,
+ .target = acpi_cpufreq_target,
+ .get = acpi_cpufreq_get,
+ .init = acpi_cpufreq_cpu_init,
+ .exit = acpi_cpufreq_cpu_exit,
+ .name = "acpi-cpufreq",
+ .owner = THIS_MODULE,
+ .attr = acpi_cpufreq_attr,
+};
+
+
+static int __init
+acpi_cpufreq_init (void)
+{
+ pr_debug("acpi_cpufreq_init\n");
+
+ return cpufreq_register_driver(&acpi_cpufreq_driver);
+}
+
+
+static void __exit
+acpi_cpufreq_exit (void)
+{
+ pr_debug("acpi_cpufreq_exit\n");
+
+ cpufreq_unregister_driver(&acpi_cpufreq_driver);
+ return;
+}
+
+
+late_initcall(acpi_cpufreq_init);
+module_exit(acpi_cpufreq_exit);
+
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 54e336de373b..b78bc35973ba 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -50,7 +50,7 @@ static int imx6q_set_target(struct cpufreq_policy *policy,
struct cpufreq_freqs freqs;
struct opp *opp;
unsigned long freq_hz, volt, volt_old;
- unsigned int index, cpu;
+ unsigned int index;
int ret;
ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
@@ -68,10 +68,7 @@ static int imx6q_set_target(struct cpufreq_policy *policy,
if (freqs.old == freqs.new)
return 0;
- for_each_online_cpu(cpu) {
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
rcu_read_lock();
opp = opp_find_freq_ceil(cpu_dev, &freq_hz);
@@ -166,10 +163,7 @@ static int imx6q_set_target(struct cpufreq_policy *policy,
}
}
- for_each_online_cpu(cpu) {
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
diff --git a/drivers/cpufreq/integrator-cpufreq.c b/drivers/cpufreq/integrator-cpufreq.c
new file mode 100644
index 000000000000..f7c99df0880b
--- /dev/null
+++ b/drivers/cpufreq/integrator-cpufreq.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2001-2002 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * CPU support functions
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/cpufreq.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/platform.h>
+#include <asm/mach-types.h>
+#include <asm/hardware/icst.h>
+
+static struct cpufreq_driver integrator_driver;
+
+#define CM_ID __io_address(INTEGRATOR_HDR_ID)
+#define CM_OSC __io_address(INTEGRATOR_HDR_OSC)
+#define CM_STAT __io_address(INTEGRATOR_HDR_STAT)
+#define CM_LOCK __io_address(INTEGRATOR_HDR_LOCK)
+
+static const struct icst_params lclk_params = {
+ .ref = 24000000,
+ .vco_max = ICST525_VCO_MAX_5V,
+ .vco_min = ICST525_VCO_MIN,
+ .vd_min = 8,
+ .vd_max = 132,
+ .rd_min = 24,
+ .rd_max = 24,
+ .s2div = icst525_s2div,
+ .idx2s = icst525_idx2s,
+};
+
+static const struct icst_params cclk_params = {
+ .ref = 24000000,
+ .vco_max = ICST525_VCO_MAX_5V,
+ .vco_min = ICST525_VCO_MIN,
+ .vd_min = 12,
+ .vd_max = 160,
+ .rd_min = 24,
+ .rd_max = 24,
+ .s2div = icst525_s2div,
+ .idx2s = icst525_idx2s,
+};
+
+/*
+ * Validate the speed policy.
+ */
+static int integrator_verify_policy(struct cpufreq_policy *policy)
+{
+ struct icst_vco vco;
+
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ vco = icst_hz_to_vco(&cclk_params, policy->max * 1000);
+ policy->max = icst_hz(&cclk_params, vco) / 1000;
+
+ vco = icst_hz_to_vco(&cclk_params, policy->min * 1000);
+ policy->min = icst_hz(&cclk_params, vco) / 1000;
+
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ return 0;
+}
+
+
+static int integrator_set_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ cpumask_t cpus_allowed;
+ int cpu = policy->cpu;
+ struct icst_vco vco;
+ struct cpufreq_freqs freqs;
+ u_int cm_osc;
+
+ /*
+ * Save this threads cpus_allowed mask.
+ */
+ cpus_allowed = current->cpus_allowed;
+
+ /*
+ * Bind to the specified CPU. When this call returns,
+ * we should be running on the right CPU.
+ */
+ set_cpus_allowed(current, cpumask_of_cpu(cpu));
+ BUG_ON(cpu != smp_processor_id());
+
+ /* get current setting */
+ cm_osc = __raw_readl(CM_OSC);
+
+ if (machine_is_integrator()) {
+ vco.s = (cm_osc >> 8) & 7;
+ } else if (machine_is_cintegrator()) {
+ vco.s = 1;
+ }
+ vco.v = cm_osc & 255;
+ vco.r = 22;
+ freqs.old = icst_hz(&cclk_params, vco) / 1000;
+
+ /* icst_hz_to_vco rounds down -- so we need the next
+ * larger freq in case of CPUFREQ_RELATION_L.
+ */
+ if (relation == CPUFREQ_RELATION_L)
+ target_freq += 999;
+ if (target_freq > policy->max)
+ target_freq = policy->max;
+ vco = icst_hz_to_vco(&cclk_params, target_freq * 1000);
+ freqs.new = icst_hz(&cclk_params, vco) / 1000;
+
+ if (freqs.old == freqs.new) {
+ set_cpus_allowed(current, cpus_allowed);
+ return 0;
+ }
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ cm_osc = __raw_readl(CM_OSC);
+
+ if (machine_is_integrator()) {
+ cm_osc &= 0xfffff800;
+ cm_osc |= vco.s << 8;
+ } else if (machine_is_cintegrator()) {
+ cm_osc &= 0xffffff00;
+ }
+ cm_osc |= vco.v;
+
+ __raw_writel(0xa05f, CM_LOCK);
+ __raw_writel(cm_osc, CM_OSC);
+ __raw_writel(0, CM_LOCK);
+
+ /*
+ * Restore the CPUs allowed mask.
+ */
+ set_cpus_allowed(current, cpus_allowed);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static unsigned int integrator_get(unsigned int cpu)
+{
+ cpumask_t cpus_allowed;
+ unsigned int current_freq;
+ u_int cm_osc;
+ struct icst_vco vco;
+
+ cpus_allowed = current->cpus_allowed;
+
+ set_cpus_allowed(current, cpumask_of_cpu(cpu));
+ BUG_ON(cpu != smp_processor_id());
+
+ /* detect memory etc. */
+ cm_osc = __raw_readl(CM_OSC);
+
+ if (machine_is_integrator()) {
+ vco.s = (cm_osc >> 8) & 7;
+ } else {
+ vco.s = 1;
+ }
+ vco.v = cm_osc & 255;
+ vco.r = 22;
+
+ current_freq = icst_hz(&cclk_params, vco) / 1000; /* current freq */
+
+ set_cpus_allowed(current, cpus_allowed);
+
+ return current_freq;
+}
+
+static int integrator_cpufreq_init(struct cpufreq_policy *policy)
+{
+
+ /* set default policy and cpuinfo */
+ policy->cpuinfo.max_freq = 160000;
+ policy->cpuinfo.min_freq = 12000;
+ policy->cpuinfo.transition_latency = 1000000; /* 1 ms, assumed */
+ policy->cur = policy->min = policy->max = integrator_get(policy->cpu);
+
+ return 0;
+}
+
+static struct cpufreq_driver integrator_driver = {
+ .verify = integrator_verify_policy,
+ .target = integrator_set_target,
+ .get = integrator_get,
+ .init = integrator_cpufreq_init,
+ .name = "integrator",
+};
+
+static int __init integrator_cpu_init(void)
+{
+ return cpufreq_register_driver(&integrator_driver);
+}
+
+static void __exit integrator_cpu_exit(void)
+{
+ cpufreq_unregister_driver(&integrator_driver);
+}
+
+MODULE_AUTHOR ("Russell M. King");
+MODULE_DESCRIPTION ("cpufreq driver for ARM Integrator CPUs");
+MODULE_LICENSE ("GPL");
+
+module_init(integrator_cpu_init);
+module_exit(integrator_cpu_exit);
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6133ef5cf671..cc3a8e6c92be 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1,5 +1,5 @@
/*
- * cpufreq_snb.c: Native P state management for Intel processors
+ * intel_pstate.c: Native P state management for Intel processors
*
* (C) Copyright 2012 Intel Corporation
* Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
@@ -657,30 +657,27 @@ static unsigned int intel_pstate_get(unsigned int cpu_num)
static int intel_pstate_set_policy(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
- int min, max;
cpu = all_cpu_data[policy->cpu];
if (!policy->cpuinfo.max_freq)
return -ENODEV;
- intel_pstate_get_min_max(cpu, &min, &max);
-
- limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
- limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
- limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
-
- limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
- limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
- limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
-
if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
limits.min_perf_pct = 100;
limits.min_perf = int_tofp(1);
limits.max_perf_pct = 100;
limits.max_perf = int_tofp(1);
limits.no_turbo = 0;
+ return 0;
}
+ limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
+ limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
+ limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
+
+ limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
+ limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
+ limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
return 0;
}
diff --git a/drivers/cpufreq/kirkwood-cpufreq.c b/drivers/cpufreq/kirkwood-cpufreq.c
index 0e83e3c24f5b..d36ea8dc96eb 100644
--- a/drivers/cpufreq/kirkwood-cpufreq.c
+++ b/drivers/cpufreq/kirkwood-cpufreq.c
@@ -55,7 +55,8 @@ static unsigned int kirkwood_cpufreq_get_cpu_frequency(unsigned int cpu)
return kirkwood_freq_table[0].frequency;
}
-static void kirkwood_cpufreq_set_cpu_state(unsigned int index)
+static void kirkwood_cpufreq_set_cpu_state(struct cpufreq_policy *policy,
+ unsigned int index)
{
struct cpufreq_freqs freqs;
unsigned int state = kirkwood_freq_table[index].index;
@@ -63,9 +64,8 @@ static void kirkwood_cpufreq_set_cpu_state(unsigned int index)
freqs.old = kirkwood_cpufreq_get_cpu_frequency(0);
freqs.new = kirkwood_freq_table[index].frequency;
- freqs.cpu = 0; /* Kirkwood is UP */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
dev_dbg(priv.dev, "Attempting to set frequency to %i KHz\n",
kirkwood_freq_table[index].frequency);
@@ -99,7 +99,7 @@ static void kirkwood_cpufreq_set_cpu_state(unsigned int index)
local_irq_enable();
}
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
};
static int kirkwood_cpufreq_verify(struct cpufreq_policy *policy)
@@ -117,7 +117,7 @@ static int kirkwood_cpufreq_target(struct cpufreq_policy *policy,
target_freq, relation, &index))
return -EINVAL;
- kirkwood_cpufreq_set_cpu_state(index);
+ kirkwood_cpufreq_set_cpu_state(policy, index);
return 0;
}
@@ -175,11 +175,9 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Cannot get memory resource\n");
return -ENODEV;
}
- priv.base = devm_request_and_ioremap(&pdev->dev, res);
- if (!priv.base) {
- dev_err(&pdev->dev, "Cannot ioremap\n");
- return -EADDRNOTAVAIL;
- }
+ priv.base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv.base))
+ return PTR_ERR(priv.base);
np = of_find_node_by_path("/cpus/cpu@0");
if (!np)
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 1180d536d1eb..b448638e34de 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -242,7 +242,8 @@ static void do_powersaver(int cx_address, unsigned int mults_index,
* Sets a new clock ratio.
*/
-static void longhaul_setstate(unsigned int table_index)
+static void longhaul_setstate(struct cpufreq_policy *policy,
+ unsigned int table_index)
{
unsigned int mults_index;
int speed, mult;
@@ -267,9 +268,8 @@ static void longhaul_setstate(unsigned int table_index)
freqs.old = calc_speed(longhaul_get_cpu_mult());
freqs.new = speed;
- freqs.cpu = 0; /* longhaul.c is UP only driver */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
pr_debug("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n",
fsb, mult/10, mult%10, print_speed(speed/1000));
@@ -386,7 +386,7 @@ retry_loop:
}
}
/* Report true CPU frequency */
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
if (!bm_timeout)
printk(KERN_INFO PFX "Warning: Timeout while waiting for "
@@ -648,7 +648,7 @@ static int longhaul_target(struct cpufreq_policy *policy,
return 0;
if (!can_scale_voltage)
- longhaul_setstate(table_index);
+ longhaul_setstate(policy, table_index);
else {
/* On test system voltage transitions exceeding single
* step up or down were turning motherboard off. Both
@@ -663,7 +663,7 @@ static int longhaul_target(struct cpufreq_policy *policy,
while (i != table_index) {
vid = (longhaul_table[i].index >> 8) & 0x1f;
if (vid != current_vid) {
- longhaul_setstate(i);
+ longhaul_setstate(policy, i);
current_vid = vid;
msleep(200);
}
@@ -672,7 +672,7 @@ static int longhaul_target(struct cpufreq_policy *policy,
else
i--;
}
- longhaul_setstate(table_index);
+ longhaul_setstate(policy, table_index);
}
longhaul_index = table_index;
return 0;
@@ -998,15 +998,17 @@ static int __init longhaul_init(void)
static void __exit longhaul_exit(void)
{
+ struct cpufreq_policy *policy = cpufreq_cpu_get(0);
int i;
for (i = 0; i < numscales; i++) {
if (mults[i] == maxmult) {
- longhaul_setstate(i);
+ longhaul_setstate(policy, i);
break;
}
}
+ cpufreq_cpu_put(policy);
cpufreq_unregister_driver(&longhaul_driver);
kfree(longhaul_table);
}
diff --git a/drivers/cpufreq/loongson2_cpufreq.c b/drivers/cpufreq/loongson2_cpufreq.c
new file mode 100644
index 000000000000..84889573b566
--- /dev/null
+++ b/drivers/cpufreq/loongson2_cpufreq.c
@@ -0,0 +1,248 @@
+/*
+ * Cpufreq driver for the loongson-2 processors
+ *
+ * The 2E revision of loongson processor not support this feature.
+ *
+ * Copyright (C) 2006 - 2008 Lemote Inc. & Insititute of Computing Technology
+ * Author: Yanhua, yanh@lemote.com
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/cpufreq.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/sched.h> /* set_cpus_allowed() */
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <asm/clock.h>
+
+#include <asm/mach-loongson/loongson.h>
+
+static uint nowait;
+
+static struct clk *cpuclk;
+
+static void (*saved_cpu_wait) (void);
+
+static int loongson2_cpu_freq_notifier(struct notifier_block *nb,
+ unsigned long val, void *data);
+
+static struct notifier_block loongson2_cpufreq_notifier_block = {
+ .notifier_call = loongson2_cpu_freq_notifier
+};
+
+static int loongson2_cpu_freq_notifier(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ if (val == CPUFREQ_POSTCHANGE)
+ current_cpu_data.udelay_val = loops_per_jiffy;
+
+ return 0;
+}
+
+static unsigned int loongson2_cpufreq_get(unsigned int cpu)
+{
+ return clk_get_rate(cpuclk);
+}
+
+/*
+ * Here we notify other drivers of the proposed change and the final change.
+ */
+static int loongson2_cpufreq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int cpu = policy->cpu;
+ unsigned int newstate = 0;
+ cpumask_t cpus_allowed;
+ struct cpufreq_freqs freqs;
+ unsigned int freq;
+
+ cpus_allowed = current->cpus_allowed;
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ if (cpufreq_frequency_table_target
+ (policy, &loongson2_clockmod_table[0], target_freq, relation,
+ &newstate))
+ return -EINVAL;
+
+ freq =
+ ((cpu_clock_freq / 1000) *
+ loongson2_clockmod_table[newstate].index) / 8;
+ if (freq < policy->min || freq > policy->max)
+ return -EINVAL;
+
+ pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
+
+ freqs.old = loongson2_cpufreq_get(cpu);
+ freqs.new = freq;
+ freqs.flags = 0;
+
+ if (freqs.new == freqs.old)
+ return 0;
+
+ /* notifiers */
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+
+ /* setting the cpu frequency */
+ clk_set_rate(cpuclk, freq);
+
+ /* notifiers */
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ pr_debug("cpufreq: set frequency %u kHz\n", freq);
+
+ return 0;
+}
+
+static int loongson2_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ int i;
+ unsigned long rate;
+ int ret;
+
+ cpuclk = clk_get(NULL, "cpu_clk");
+ if (IS_ERR(cpuclk)) {
+ printk(KERN_ERR "cpufreq: couldn't get CPU clk\n");
+ return PTR_ERR(cpuclk);
+ }
+
+ rate = cpu_clock_freq / 1000;
+ if (!rate) {
+ clk_put(cpuclk);
+ return -EINVAL;
+ }
+ ret = clk_set_rate(cpuclk, rate);
+ if (ret) {
+ clk_put(cpuclk);
+ return ret;
+ }
+
+ /* clock table init */
+ for (i = 2;
+ (loongson2_clockmod_table[i].frequency != CPUFREQ_TABLE_END);
+ i++)
+ loongson2_clockmod_table[i].frequency = (rate * i) / 8;
+
+ policy->cur = loongson2_cpufreq_get(policy->cpu);
+
+ cpufreq_frequency_table_get_attr(&loongson2_clockmod_table[0],
+ policy->cpu);
+
+ return cpufreq_frequency_table_cpuinfo(policy,
+ &loongson2_clockmod_table[0]);
+}
+
+static int loongson2_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy,
+ &loongson2_clockmod_table[0]);
+}
+
+static int loongson2_cpufreq_exit(struct cpufreq_policy *policy)
+{
+ clk_put(cpuclk);
+ return 0;
+}
+
+static struct freq_attr *loongson2_table_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver loongson2_cpufreq_driver = {
+ .owner = THIS_MODULE,
+ .name = "loongson2",
+ .init = loongson2_cpufreq_cpu_init,
+ .verify = loongson2_cpufreq_verify,
+ .target = loongson2_cpufreq_target,
+ .get = loongson2_cpufreq_get,
+ .exit = loongson2_cpufreq_exit,
+ .attr = loongson2_table_attr,
+};
+
+static struct platform_device_id platform_device_ids[] = {
+ {
+ .name = "loongson2_cpufreq",
+ },
+ {}
+};
+
+MODULE_DEVICE_TABLE(platform, platform_device_ids);
+
+static struct platform_driver platform_driver = {
+ .driver = {
+ .name = "loongson2_cpufreq",
+ .owner = THIS_MODULE,
+ },
+ .id_table = platform_device_ids,
+};
+
+/*
+ * This is the simple version of Loongson-2 wait, Maybe we need do this in
+ * interrupt disabled context.
+ */
+
+static DEFINE_SPINLOCK(loongson2_wait_lock);
+
+static void loongson2_cpu_wait(void)
+{
+ unsigned long flags;
+ u32 cpu_freq;
+
+ spin_lock_irqsave(&loongson2_wait_lock, flags);
+ cpu_freq = LOONGSON_CHIPCFG0;
+ LOONGSON_CHIPCFG0 &= ~0x7; /* Put CPU into wait mode */
+ LOONGSON_CHIPCFG0 = cpu_freq; /* Restore CPU state */
+ spin_unlock_irqrestore(&loongson2_wait_lock, flags);
+}
+
+static int __init cpufreq_init(void)
+{
+ int ret;
+
+ /* Register platform stuff */
+ ret = platform_driver_register(&platform_driver);
+ if (ret)
+ return ret;
+
+ pr_info("cpufreq: Loongson-2F CPU frequency driver.\n");
+
+ cpufreq_register_notifier(&loongson2_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+
+ ret = cpufreq_register_driver(&loongson2_cpufreq_driver);
+
+ if (!ret && !nowait) {
+ saved_cpu_wait = cpu_wait;
+ cpu_wait = loongson2_cpu_wait;
+ }
+
+ return ret;
+}
+
+static void __exit cpufreq_exit(void)
+{
+ if (!nowait && saved_cpu_wait)
+ cpu_wait = saved_cpu_wait;
+ cpufreq_unregister_driver(&loongson2_cpufreq_driver);
+ cpufreq_unregister_notifier(&loongson2_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+
+ platform_driver_unregister(&platform_driver);
+}
+
+module_init(cpufreq_init);
+module_exit(cpufreq_exit);
+
+module_param(nowait, uint, 0644);
+MODULE_PARM_DESC(nowait, "Disable Loongson-2F specific wait");
+
+MODULE_AUTHOR("Yanhua <yanh@lemote.com>");
+MODULE_DESCRIPTION("cpufreq driver for Loongson2F");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/maple-cpufreq.c b/drivers/cpufreq/maple-cpufreq.c
index d4c4989823dc..cdd62915efaf 100644
--- a/drivers/cpufreq/maple-cpufreq.c
+++ b/drivers/cpufreq/maple-cpufreq.c
@@ -158,11 +158,10 @@ static int maple_cpufreq_target(struct cpufreq_policy *policy,
freqs.old = maple_cpu_freqs[maple_pmode_cur].frequency;
freqs.new = maple_cpu_freqs[newstate].frequency;
- freqs.cpu = 0;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
rc = maple_scom_switch_freq(newstate);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
mutex_unlock(&maple_switch_mutex);
diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index 9128c07bafba..0279d18a57f9 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -25,6 +25,7 @@
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
+#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <asm/smp_plat.h>
@@ -88,16 +89,12 @@ static int omap_target(struct cpufreq_policy *policy,
}
freqs.old = omap_getspeed(policy->cpu);
- freqs.cpu = policy->cpu;
if (freqs.old == freqs.new && policy->cur == freqs.new)
return ret;
/* notifiers */
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
freq = freqs.new * 1000;
ret = clk_round_rate(mpu_clk, freq);
@@ -157,10 +154,7 @@ static int omap_target(struct cpufreq_policy *policy,
done:
/* notifiers */
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return ret;
}
@@ -184,7 +178,7 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
goto fail_ck;
}
- policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);
+ policy->cur = omap_getspeed(policy->cpu);
if (!freq_table)
result = opp_init_cpufreq_table(mpu_dev, &freq_table);
@@ -203,8 +197,6 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
- policy->min = policy->cpuinfo.min_freq;
- policy->max = policy->cpuinfo.max_freq;
policy->cur = omap_getspeed(policy->cpu);
/*
@@ -252,7 +244,7 @@ static struct cpufreq_driver omap_driver = {
.attr = omap_cpufreq_attr,
};
-static int __init omap_cpufreq_init(void)
+static int omap_cpufreq_probe(struct platform_device *pdev)
{
mpu_dev = get_cpu_device(0);
if (!mpu_dev) {
@@ -280,12 +272,20 @@ static int __init omap_cpufreq_init(void)
return cpufreq_register_driver(&omap_driver);
}
-static void __exit omap_cpufreq_exit(void)
+static int omap_cpufreq_remove(struct platform_device *pdev)
{
- cpufreq_unregister_driver(&omap_driver);
+ return cpufreq_unregister_driver(&omap_driver);
}
+static struct platform_driver omap_cpufreq_platdrv = {
+ .driver = {
+ .name = "omap-cpufreq",
+ .owner = THIS_MODULE,
+ },
+ .probe = omap_cpufreq_probe,
+ .remove = omap_cpufreq_remove,
+};
+module_platform_driver(omap_cpufreq_platdrv);
+
MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
MODULE_LICENSE("GPL");
-module_init(omap_cpufreq_init);
-module_exit(omap_cpufreq_exit);
diff --git a/drivers/cpufreq/p4-clockmod.c b/drivers/cpufreq/p4-clockmod.c
index 827629c9aad7..421ef37d0bb3 100644
--- a/drivers/cpufreq/p4-clockmod.c
+++ b/drivers/cpufreq/p4-clockmod.c
@@ -58,8 +58,7 @@ static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate)
{
u32 l, h;
- if (!cpu_online(cpu) ||
- (newstate > DC_DISABLE) || (newstate == DC_RESV))
+ if ((newstate > DC_DISABLE) || (newstate == DC_RESV))
return -EINVAL;
rdmsr_on_cpu(cpu, MSR_IA32_THERM_STATUS, &l, &h);
@@ -125,10 +124,7 @@ static int cpufreq_p4_target(struct cpufreq_policy *policy,
return 0;
/* notifiers */
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* run on each logical CPU,
* see section 13.15.3 of IA32 Intel Architecture Software
@@ -138,10 +134,7 @@ static int cpufreq_p4_target(struct cpufreq_policy *policy,
cpufreq_p4_setdc(i, p4clockmod_table[newstate].index);
/* notifiers */
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index 503996a94a6a..0de00081a81e 100644
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -215,8 +215,7 @@ static int pcc_cpufreq_target(struct cpufreq_policy *policy,
(pcch_virt_addr + pcc_cpu_data->input_offset));
freqs.new = target_freq;
- freqs.cpu = cpu;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
input_buffer = 0x1 | (((target_freq * 100)
/ (ioread32(&pcch_hdr->nominal) * 1000)) << 8);
@@ -237,7 +236,7 @@ static int pcc_cpufreq_target(struct cpufreq_policy *policy,
}
iowrite16(0, &pcch_hdr->status);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
pr_debug("target: was SUCCESSFUL for cpu %d\n", cpu);
spin_unlock(&pcc_lock);
diff --git a/drivers/cpufreq/powernow-k6.c b/drivers/cpufreq/powernow-k6.c
index af23e0b9ec92..ea0222a45b7b 100644
--- a/drivers/cpufreq/powernow-k6.c
+++ b/drivers/cpufreq/powernow-k6.c
@@ -68,7 +68,8 @@ static int powernow_k6_get_cpu_multiplier(void)
*
* Tries to change the PowerNow! multiplier
*/
-static void powernow_k6_set_state(unsigned int best_i)
+static void powernow_k6_set_state(struct cpufreq_policy *policy,
+ unsigned int best_i)
{
unsigned long outvalue = 0, invalue = 0;
unsigned long msrval;
@@ -81,9 +82,8 @@ static void powernow_k6_set_state(unsigned int best_i)
freqs.old = busfreq * powernow_k6_get_cpu_multiplier();
freqs.new = busfreq * clock_ratio[best_i].index;
- freqs.cpu = 0; /* powernow-k6.c is UP only driver */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* we now need to transform best_i to the BVC format, see AMD#23446 */
@@ -98,7 +98,7 @@ static void powernow_k6_set_state(unsigned int best_i)
msrval = POWERNOW_IOPORT + 0x0;
wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return;
}
@@ -136,7 +136,7 @@ static int powernow_k6_target(struct cpufreq_policy *policy,
target_freq, relation, &newstate))
return -EINVAL;
- powernow_k6_set_state(newstate);
+ powernow_k6_set_state(policy, newstate);
return 0;
}
@@ -182,7 +182,7 @@ static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
unsigned int i;
for (i = 0; i < 8; i++) {
if (i == max_multiplier)
- powernow_k6_set_state(i);
+ powernow_k6_set_state(policy, i);
}
cpufreq_frequency_table_put_attr(policy->cpu);
return 0;
diff --git a/drivers/cpufreq/powernow-k7.c b/drivers/cpufreq/powernow-k7.c
index 334cc2f1e9f1..53888dacbe58 100644
--- a/drivers/cpufreq/powernow-k7.c
+++ b/drivers/cpufreq/powernow-k7.c
@@ -248,7 +248,7 @@ static void change_VID(int vid)
}
-static void change_speed(unsigned int index)
+static void change_speed(struct cpufreq_policy *policy, unsigned int index)
{
u8 fid, vid;
struct cpufreq_freqs freqs;
@@ -263,15 +263,13 @@ static void change_speed(unsigned int index)
fid = powernow_table[index].index & 0xFF;
vid = (powernow_table[index].index & 0xFF00) >> 8;
- freqs.cpu = 0;
-
rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
cfid = fidvidstatus.bits.CFID;
freqs.old = fsb * fid_codes[cfid] / 10;
freqs.new = powernow_table[index].frequency;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Now do the magic poking into the MSRs. */
@@ -292,7 +290,7 @@ static void change_speed(unsigned int index)
if (have_a0 == 1)
local_irq_enable();
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
}
@@ -546,7 +544,7 @@ static int powernow_target(struct cpufreq_policy *policy,
relation, &newstate))
return -EINVAL;
- change_speed(newstate);
+ change_speed(policy, newstate);
return 0;
}
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index d13a13678b5f..b828efe4b2f8 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -928,9 +928,10 @@ static int get_transition_latency(struct powernow_k8_data *data)
static int transition_frequency_fidvid(struct powernow_k8_data *data,
unsigned int index)
{
+ struct cpufreq_policy *policy;
u32 fid = 0;
u32 vid = 0;
- int res, i;
+ int res;
struct cpufreq_freqs freqs;
pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
@@ -959,10 +960,10 @@ static int transition_frequency_fidvid(struct powernow_k8_data *data,
freqs.old = find_khz_freq_from_fid(data->currfid);
freqs.new = find_khz_freq_from_fid(fid);
- for_each_cpu(i, data->available_cores) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ policy = cpufreq_cpu_get(smp_processor_id());
+ cpufreq_cpu_put(policy);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
res = transition_fid_vid(data, fid, vid);
if (res)
@@ -970,10 +971,7 @@ static int transition_frequency_fidvid(struct powernow_k8_data *data,
freqs.new = find_khz_freq_from_fid(data->currfid);
- for_each_cpu(i, data->available_cores) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return res;
}
@@ -1104,9 +1102,6 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
struct init_on_cpu init_on_cpu;
int rc;
- if (!cpu_online(pol->cpu))
- return -ENODEV;
-
smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
if (rc)
return -ENODEV;
diff --git a/drivers/cpufreq/ppc_cbe_cpufreq.c b/drivers/cpufreq/ppc_cbe_cpufreq.c
new file mode 100644
index 000000000000..e577a1dbbfcd
--- /dev/null
+++ b/drivers/cpufreq/ppc_cbe_cpufreq.c
@@ -0,0 +1,209 @@
+/*
+ * cpufreq driver for the cell processor
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/cell-regs.h>
+
+#include "ppc_cbe_cpufreq.h"
+
+static DEFINE_MUTEX(cbe_switch_mutex);
+
+
+/* the CBE supports an 8 step frequency scaling */
+static struct cpufreq_frequency_table cbe_freqs[] = {
+ {1, 0},
+ {2, 0},
+ {3, 0},
+ {4, 0},
+ {5, 0},
+ {6, 0},
+ {8, 0},
+ {10, 0},
+ {0, CPUFREQ_TABLE_END},
+};
+
+/*
+ * hardware specific functions
+ */
+
+static int set_pmode(unsigned int cpu, unsigned int slow_mode)
+{
+ int rc;
+
+ if (cbe_cpufreq_has_pmi)
+ rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode);
+ else
+ rc = cbe_cpufreq_set_pmode(cpu, slow_mode);
+
+ pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu));
+
+ return rc;
+}
+
+/*
+ * cpufreq functions
+ */
+
+static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ const u32 *max_freqp;
+ u32 max_freq;
+ int i, cur_pmode;
+ struct device_node *cpu;
+
+ cpu = of_get_cpu_node(policy->cpu, NULL);
+
+ if (!cpu)
+ return -ENODEV;
+
+ pr_debug("init cpufreq on CPU %d\n", policy->cpu);
+
+ /*
+ * Let's check we can actually get to the CELL regs
+ */
+ if (!cbe_get_cpu_pmd_regs(policy->cpu) ||
+ !cbe_get_cpu_mic_tm_regs(policy->cpu)) {
+ pr_info("invalid CBE regs pointers for cpufreq\n");
+ return -EINVAL;
+ }
+
+ max_freqp = of_get_property(cpu, "clock-frequency", NULL);
+
+ of_node_put(cpu);
+
+ if (!max_freqp)
+ return -EINVAL;
+
+ /* we need the freq in kHz */
+ max_freq = *max_freqp / 1000;
+
+ pr_debug("max clock-frequency is at %u kHz\n", max_freq);
+ pr_debug("initializing frequency table\n");
+
+ /* initialize frequency table */
+ for (i=0; cbe_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) {
+ cbe_freqs[i].frequency = max_freq / cbe_freqs[i].index;
+ pr_debug("%d: %d\n", i, cbe_freqs[i].frequency);
+ }
+
+ /* if DEBUG is enabled set_pmode() measures the latency
+ * of a transition */
+ policy->cpuinfo.transition_latency = 25000;
+
+ cur_pmode = cbe_cpufreq_get_pmode(policy->cpu);
+ pr_debug("current pmode is at %d\n",cur_pmode);
+
+ policy->cur = cbe_freqs[cur_pmode].frequency;
+
+#ifdef CONFIG_SMP
+ cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu));
+#endif
+
+ cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);
+
+ /* this ensures that policy->cpuinfo_min
+ * and policy->cpuinfo_max are set correctly */
+ return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
+}
+
+static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_put_attr(policy->cpu);
+ return 0;
+}
+
+static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, cbe_freqs);
+}
+
+static int cbe_cpufreq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ int rc;
+ struct cpufreq_freqs freqs;
+ unsigned int cbe_pmode_new;
+
+ cpufreq_frequency_table_target(policy,
+ cbe_freqs,
+ target_freq,
+ relation,
+ &cbe_pmode_new);
+
+ freqs.old = policy->cur;
+ freqs.new = cbe_freqs[cbe_pmode_new].frequency;
+
+ mutex_lock(&cbe_switch_mutex);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ pr_debug("setting frequency for cpu %d to %d kHz, " \
+ "1/%d of max frequency\n",
+ policy->cpu,
+ cbe_freqs[cbe_pmode_new].frequency,
+ cbe_freqs[cbe_pmode_new].index);
+
+ rc = set_pmode(policy->cpu, cbe_pmode_new);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+ mutex_unlock(&cbe_switch_mutex);
+
+ return rc;
+}
+
+static struct cpufreq_driver cbe_cpufreq_driver = {
+ .verify = cbe_cpufreq_verify,
+ .target = cbe_cpufreq_target,
+ .init = cbe_cpufreq_cpu_init,
+ .exit = cbe_cpufreq_cpu_exit,
+ .name = "cbe-cpufreq",
+ .owner = THIS_MODULE,
+ .flags = CPUFREQ_CONST_LOOPS,
+};
+
+/*
+ * module init and destoy
+ */
+
+static int __init cbe_cpufreq_init(void)
+{
+ if (!machine_is(cell))
+ return -ENODEV;
+
+ return cpufreq_register_driver(&cbe_cpufreq_driver);
+}
+
+static void __exit cbe_cpufreq_exit(void)
+{
+ cpufreq_unregister_driver(&cbe_cpufreq_driver);
+}
+
+module_init(cbe_cpufreq_init);
+module_exit(cbe_cpufreq_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
diff --git a/drivers/cpufreq/ppc_cbe_cpufreq.h b/drivers/cpufreq/ppc_cbe_cpufreq.h
new file mode 100644
index 000000000000..b4c00a5a6a59
--- /dev/null
+++ b/drivers/cpufreq/ppc_cbe_cpufreq.h
@@ -0,0 +1,24 @@
+/*
+ * ppc_cbe_cpufreq.h
+ *
+ * This file contains the definitions used by the cbe_cpufreq driver.
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ */
+
+#include <linux/cpufreq.h>
+#include <linux/types.h>
+
+int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode);
+int cbe_cpufreq_get_pmode(int cpu);
+
+int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode);
+
+#if defined(CONFIG_CPU_FREQ_CBE_PMI) || defined(CONFIG_CPU_FREQ_CBE_PMI_MODULE)
+extern bool cbe_cpufreq_has_pmi;
+#else
+#define cbe_cpufreq_has_pmi (0)
+#endif
diff --git a/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c b/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c
new file mode 100644
index 000000000000..84d2f2cf5ba7
--- /dev/null
+++ b/drivers/cpufreq/ppc_cbe_cpufreq_pervasive.c
@@ -0,0 +1,115 @@
+/*
+ * pervasive backend for the cbe_cpufreq driver
+ *
+ * This driver makes use of the pervasive unit to
+ * engage the desired frequency.
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <asm/machdep.h>
+#include <asm/hw_irq.h>
+#include <asm/cell-regs.h>
+
+#include "ppc_cbe_cpufreq.h"
+
+/* to write to MIC register */
+static u64 MIC_Slow_Fast_Timer_table[] = {
+ [0 ... 7] = 0x007fc00000000000ull,
+};
+
+/* more values for the MIC */
+static u64 MIC_Slow_Next_Timer_table[] = {
+ 0x0000240000000000ull,
+ 0x0000268000000000ull,
+ 0x000029C000000000ull,
+ 0x00002D0000000000ull,
+ 0x0000300000000000ull,
+ 0x0000334000000000ull,
+ 0x000039C000000000ull,
+ 0x00003FC000000000ull,
+};
+
+
+int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
+{
+ struct cbe_pmd_regs __iomem *pmd_regs;
+ struct cbe_mic_tm_regs __iomem *mic_tm_regs;
+ unsigned long flags;
+ u64 value;
+#ifdef DEBUG
+ long time;
+#endif
+
+ local_irq_save(flags);
+
+ mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
+ pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+
+#ifdef DEBUG
+ time = jiffies;
+#endif
+
+ out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
+ out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
+
+ out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
+ out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
+
+ value = in_be64(&pmd_regs->pmcr);
+ /* set bits to zero */
+ value &= 0xFFFFFFFFFFFFFFF8ull;
+ /* set bits to next pmode */
+ value |= pmode;
+
+ out_be64(&pmd_regs->pmcr, value);
+
+#ifdef DEBUG
+ /* wait until new pmode appears in status register */
+ value = in_be64(&pmd_regs->pmsr) & 0x07;
+ while (value != pmode) {
+ cpu_relax();
+ value = in_be64(&pmd_regs->pmsr) & 0x07;
+ }
+
+ time = jiffies - time;
+ time = jiffies_to_msecs(time);
+ pr_debug("had to wait %lu ms for a transition using " \
+ "pervasive unit\n", time);
+#endif
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+
+int cbe_cpufreq_get_pmode(int cpu)
+{
+ int ret;
+ struct cbe_pmd_regs __iomem *pmd_regs;
+
+ pmd_regs = cbe_get_cpu_pmd_regs(cpu);
+ ret = in_be64(&pmd_regs->pmsr) & 0x07;
+
+ return ret;
+}
+
diff --git a/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
new file mode 100644
index 000000000000..d29e8da396a0
--- /dev/null
+++ b/drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
@@ -0,0 +1,156 @@
+/*
+ * pmi backend for the cbe_cpufreq driver
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
+ *
+ * Author: Christian Krafft <krafft@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+
+#include <asm/processor.h>
+#include <asm/prom.h>
+#include <asm/pmi.h>
+#include <asm/cell-regs.h>
+
+#ifdef DEBUG
+#include <asm/time.h>
+#endif
+
+#include "ppc_cbe_cpufreq.h"
+
+static u8 pmi_slow_mode_limit[MAX_CBE];
+
+bool cbe_cpufreq_has_pmi = false;
+EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
+
+/*
+ * hardware specific functions
+ */
+
+int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode)
+{
+ int ret;
+ pmi_message_t pmi_msg;
+#ifdef DEBUG
+ long time;
+#endif
+ pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
+ pmi_msg.data1 = cbe_cpu_to_node(cpu);
+ pmi_msg.data2 = pmode;
+
+#ifdef DEBUG
+ time = jiffies;
+#endif
+ pmi_send_message(pmi_msg);
+
+#ifdef DEBUG
+ time = jiffies - time;
+ time = jiffies_to_msecs(time);
+ pr_debug("had to wait %lu ms for a transition using " \
+ "PMI\n", time);
+#endif
+ ret = pmi_msg.data2;
+ pr_debug("PMI returned slow mode %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);
+
+
+static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
+{
+ u8 node, slow_mode;
+
+ BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
+
+ node = pmi_msg.data1;
+ slow_mode = pmi_msg.data2;
+
+ pmi_slow_mode_limit[node] = slow_mode;
+
+ pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
+}
+
+static int pmi_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct cpufreq_policy *policy = data;
+ struct cpufreq_frequency_table *cbe_freqs;
+ u8 node;
+
+ /* Should this really be called for CPUFREQ_ADJUST, CPUFREQ_INCOMPATIBLE
+ * and CPUFREQ_NOTIFY policy events?)
+ */
+ if (event == CPUFREQ_START)
+ return 0;
+
+ cbe_freqs = cpufreq_frequency_get_table(policy->cpu);
+ node = cbe_cpu_to_node(policy->cpu);
+
+ pr_debug("got notified, event=%lu, node=%u\n", event, node);
+
+ if (pmi_slow_mode_limit[node] != 0) {
+ pr_debug("limiting node %d to slow mode %d\n",
+ node, pmi_slow_mode_limit[node]);
+
+ cpufreq_verify_within_limits(policy, 0,
+
+ cbe_freqs[pmi_slow_mode_limit[node]].frequency);
+ }
+
+ return 0;
+}
+
+static struct notifier_block pmi_notifier_block = {
+ .notifier_call = pmi_notifier,
+};
+
+static struct pmi_handler cbe_pmi_handler = {
+ .type = PMI_TYPE_FREQ_CHANGE,
+ .handle_pmi_message = cbe_cpufreq_handle_pmi,
+};
+
+
+
+static int __init cbe_cpufreq_pmi_init(void)
+{
+ cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
+
+ if (!cbe_cpufreq_has_pmi)
+ return -ENODEV;
+
+ cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+
+ return 0;
+}
+
+static void __exit cbe_cpufreq_pmi_exit(void)
+{
+ cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+ pmi_unregister_handler(&cbe_pmi_handler);
+}
+
+module_init(cbe_cpufreq_pmi_init);
+module_exit(cbe_cpufreq_pmi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
diff --git a/drivers/cpufreq/pxa2xx-cpufreq.c b/drivers/cpufreq/pxa2xx-cpufreq.c
new file mode 100644
index 000000000000..9e5bc8e388a0
--- /dev/null
+++ b/drivers/cpufreq/pxa2xx-cpufreq.c
@@ -0,0 +1,492 @@
+/*
+ * Copyright (C) 2002,2003 Intrinsyc Software
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * History:
+ * 31-Jul-2002 : Initial version [FB]
+ * 29-Jan-2003 : added PXA255 support [FB]
+ * 20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
+ *
+ * Note:
+ * This driver may change the memory bus clock rate, but will not do any
+ * platform specific access timing changes... for example if you have flash
+ * memory connected to CS0, you will need to register a platform specific
+ * notifier which will adjust the memory access strobes to maintain a
+ * minimum strobe width.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/err.h>
+#include <linux/regulator/consumer.h>
+#include <linux/io.h>
+
+#include <mach/pxa2xx-regs.h>
+#include <mach/smemc.h>
+
+#ifdef DEBUG
+static unsigned int freq_debug;
+module_param(freq_debug, uint, 0);
+MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
+#else
+#define freq_debug 0
+#endif
+
+static struct regulator *vcc_core;
+
+static unsigned int pxa27x_maxfreq;
+module_param(pxa27x_maxfreq, uint, 0);
+MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
+ "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
+
+typedef struct {
+ unsigned int khz;
+ unsigned int membus;
+ unsigned int cccr;
+ unsigned int div2;
+ unsigned int cclkcfg;
+ int vmin;
+ int vmax;
+} pxa_freqs_t;
+
+/* Define the refresh period in mSec for the SDRAM and the number of rows */
+#define SDRAM_TREF 64 /* standard 64ms SDRAM */
+static unsigned int sdram_rows;
+
+#define CCLKCFG_TURBO 0x1
+#define CCLKCFG_FCS 0x2
+#define CCLKCFG_HALFTURBO 0x4
+#define CCLKCFG_FASTBUS 0x8
+#define MDREFR_DB2_MASK (MDREFR_K2DB2 | MDREFR_K1DB2)
+#define MDREFR_DRI_MASK 0xFFF
+
+#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
+#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
+
+/*
+ * PXA255 definitions
+ */
+/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
+#define CCLKCFG CCLKCFG_TURBO | CCLKCFG_FCS
+
+static pxa_freqs_t pxa255_run_freqs[] =
+{
+ /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
+ { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
+ {132700, 132700, 0x123, 1, CCLKCFG, -1, -1}, /* 133, 133, 66, 66 */
+ {199100, 99500, 0x141, 0, CCLKCFG, -1, -1}, /* 199, 199, 99, 99 */
+ {265400, 132700, 0x143, 1, CCLKCFG, -1, -1}, /* 265, 265, 133, 66 */
+ {331800, 165900, 0x145, 1, CCLKCFG, -1, -1}, /* 331, 331, 166, 83 */
+ {398100, 99500, 0x161, 0, CCLKCFG, -1, -1}, /* 398, 398, 196, 99 */
+};
+
+/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
+static pxa_freqs_t pxa255_turbo_freqs[] =
+{
+ /* CPU MEMBUS CCCR DIV2 CCLKCFG run turbo PXbus SDRAM */
+ { 99500, 99500, 0x121, 1, CCLKCFG, -1, -1}, /* 99, 99, 50, 50 */
+ {199100, 99500, 0x221, 0, CCLKCFG, -1, -1}, /* 99, 199, 50, 99 */
+ {298500, 99500, 0x321, 0, CCLKCFG, -1, -1}, /* 99, 287, 50, 99 */
+ {298600, 99500, 0x1c1, 0, CCLKCFG, -1, -1}, /* 199, 287, 99, 99 */
+ {398100, 99500, 0x241, 0, CCLKCFG, -1, -1}, /* 199, 398, 99, 99 */
+};
+
+#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
+#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
+
+static struct cpufreq_frequency_table
+ pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
+static struct cpufreq_frequency_table
+ pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
+
+static unsigned int pxa255_turbo_table;
+module_param(pxa255_turbo_table, uint, 0);
+MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
+
+/*
+ * PXA270 definitions
+ *
+ * For the PXA27x:
+ * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG.
+ *
+ * A = 0 => memory controller clock from table 3-7,
+ * A = 1 => memory controller clock = system bus clock
+ * Run mode frequency = 13 MHz * L
+ * Turbo mode frequency = 13 MHz * L * N
+ * System bus frequency = 13 MHz * L / (B + 1)
+ *
+ * In CCCR:
+ * A = 1
+ * L = 16 oscillator to run mode ratio
+ * 2N = 6 2 * (turbo mode to run mode ratio)
+ *
+ * In CCLKCFG:
+ * B = 1 Fast bus mode
+ * HT = 0 Half-Turbo mode
+ * T = 1 Turbo mode
+ *
+ * For now, just support some of the combinations in table 3-7 of
+ * PXA27x Processor Family Developer's Manual to simplify frequency
+ * change sequences.
+ */
+#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L)
+#define CCLKCFG2(B, HT, T) \
+ (CCLKCFG_FCS | \
+ ((B) ? CCLKCFG_FASTBUS : 0) | \
+ ((HT) ? CCLKCFG_HALFTURBO : 0) | \
+ ((T) ? CCLKCFG_TURBO : 0))
+
+static pxa_freqs_t pxa27x_freqs[] = {
+ {104000, 104000, PXA27x_CCCR(1, 8, 2), 0, CCLKCFG2(1, 0, 1), 900000, 1705000 },
+ {156000, 104000, PXA27x_CCCR(1, 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 },
+ {208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 },
+ {312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 },
+ {416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 },
+ {520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 },
+ {624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 }
+};
+
+#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
+static struct cpufreq_frequency_table
+ pxa27x_freq_table[NUM_PXA27x_FREQS+1];
+
+extern unsigned get_clk_frequency_khz(int info);
+
+#ifdef CONFIG_REGULATOR
+
+static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
+{
+ int ret = 0;
+ int vmin, vmax;
+
+ if (!cpu_is_pxa27x())
+ return 0;
+
+ vmin = pxa_freq->vmin;
+ vmax = pxa_freq->vmax;
+ if ((vmin == -1) || (vmax == -1))
+ return 0;
+
+ ret = regulator_set_voltage(vcc_core, vmin, vmax);
+ if (ret)
+ pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n",
+ vmin, vmax);
+ return ret;
+}
+
+static __init void pxa_cpufreq_init_voltages(void)
+{
+ vcc_core = regulator_get(NULL, "vcc_core");
+ if (IS_ERR(vcc_core)) {
+ pr_info("cpufreq: Didn't find vcc_core regulator\n");
+ vcc_core = NULL;
+ } else {
+ pr_info("cpufreq: Found vcc_core regulator\n");
+ }
+}
+#else
+static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
+{
+ return 0;
+}
+
+static __init void pxa_cpufreq_init_voltages(void) { }
+#endif
+
+static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
+ pxa_freqs_t **pxa_freqs)
+{
+ if (cpu_is_pxa25x()) {
+ if (!pxa255_turbo_table) {
+ *pxa_freqs = pxa255_run_freqs;
+ *freq_table = pxa255_run_freq_table;
+ } else {
+ *pxa_freqs = pxa255_turbo_freqs;
+ *freq_table = pxa255_turbo_freq_table;
+ }
+ } else if (cpu_is_pxa27x()) {
+ *pxa_freqs = pxa27x_freqs;
+ *freq_table = pxa27x_freq_table;
+ } else {
+ BUG();
+ }
+}
+
+static void pxa27x_guess_max_freq(void)
+{
+ if (!pxa27x_maxfreq) {
+ pxa27x_maxfreq = 416000;
+ printk(KERN_INFO "PXA CPU 27x max frequency not defined "
+ "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
+ pxa27x_maxfreq);
+ } else {
+ pxa27x_maxfreq *= 1000;
+ }
+}
+
+static void init_sdram_rows(void)
+{
+ uint32_t mdcnfg = __raw_readl(MDCNFG);
+ unsigned int drac2 = 0, drac0 = 0;
+
+ if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
+ drac2 = MDCNFG_DRAC2(mdcnfg);
+
+ if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
+ drac0 = MDCNFG_DRAC0(mdcnfg);
+
+ sdram_rows = 1 << (11 + max(drac0, drac2));
+}
+
+static u32 mdrefr_dri(unsigned int freq)
+{
+ u32 interval = freq * SDRAM_TREF / sdram_rows;
+
+ return (interval - (cpu_is_pxa27x() ? 31 : 0)) / 32;
+}
+
+/* find a valid frequency point */
+static int pxa_verify_policy(struct cpufreq_policy *policy)
+{
+ struct cpufreq_frequency_table *pxa_freqs_table;
+ pxa_freqs_t *pxa_freqs;
+ int ret;
+
+ find_freq_tables(&pxa_freqs_table, &pxa_freqs);
+ ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table);
+
+ if (freq_debug)
+ pr_debug("Verified CPU policy: %dKhz min to %dKhz max\n",
+ policy->min, policy->max);
+
+ return ret;
+}
+
+static unsigned int pxa_cpufreq_get(unsigned int cpu)
+{
+ return get_clk_frequency_khz(0);
+}
+
+static int pxa_set_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct cpufreq_frequency_table *pxa_freqs_table;
+ pxa_freqs_t *pxa_freq_settings;
+ struct cpufreq_freqs freqs;
+ unsigned int idx;
+ unsigned long flags;
+ unsigned int new_freq_cpu, new_freq_mem;
+ unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
+ int ret = 0;
+
+ /* Get the current policy */
+ find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
+
+ /* Lookup the next frequency */
+ if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
+ target_freq, relation, &idx)) {
+ return -EINVAL;
+ }
+
+ new_freq_cpu = pxa_freq_settings[idx].khz;
+ new_freq_mem = pxa_freq_settings[idx].membus;
+ freqs.old = policy->cur;
+ freqs.new = new_freq_cpu;
+
+ if (freq_debug)
+ pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n",
+ freqs.new / 1000, (pxa_freq_settings[idx].div2) ?
+ (new_freq_mem / 2000) : (new_freq_mem / 1000));
+
+ if (vcc_core && freqs.new > freqs.old)
+ ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
+ if (ret)
+ return ret;
+ /*
+ * Tell everyone what we're about to do...
+ * you should add a notify client with any platform specific
+ * Vcc changing capability
+ */
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ /* Calculate the next MDREFR. If we're slowing down the SDRAM clock
+ * we need to preset the smaller DRI before the change. If we're
+ * speeding up we need to set the larger DRI value after the change.
+ */
+ preset_mdrefr = postset_mdrefr = __raw_readl(MDREFR);
+ if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) {
+ preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
+ preset_mdrefr |= mdrefr_dri(new_freq_mem);
+ }
+ postset_mdrefr =
+ (postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem);
+
+ /* If we're dividing the memory clock by two for the SDRAM clock, this
+ * must be set prior to the change. Clearing the divide must be done
+ * after the change.
+ */
+ if (pxa_freq_settings[idx].div2) {
+ preset_mdrefr |= MDREFR_DB2_MASK;
+ postset_mdrefr |= MDREFR_DB2_MASK;
+ } else {
+ postset_mdrefr &= ~MDREFR_DB2_MASK;
+ }
+
+ local_irq_save(flags);
+
+ /* Set new the CCCR and prepare CCLKCFG */
+ CCCR = pxa_freq_settings[idx].cccr;
+ cclkcfg = pxa_freq_settings[idx].cclkcfg;
+
+ asm volatile(" \n\
+ ldr r4, [%1] /* load MDREFR */ \n\
+ b 2f \n\
+ .align 5 \n\
+1: \n\
+ str %3, [%1] /* preset the MDREFR */ \n\
+ mcr p14, 0, %2, c6, c0, 0 /* set CCLKCFG[FCS] */ \n\
+ str %4, [%1] /* postset the MDREFR */ \n\
+ \n\
+ b 3f \n\
+2: b 1b \n\
+3: nop \n\
+ "
+ : "=&r" (unused)
+ : "r" (MDREFR), "r" (cclkcfg),
+ "r" (preset_mdrefr), "r" (postset_mdrefr)
+ : "r4", "r5");
+ local_irq_restore(flags);
+
+ /*
+ * Tell everyone what we've just done...
+ * you should add a notify client with any platform specific
+ * SDRAM refresh timer adjustments
+ */
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ /*
+ * Even if voltage setting fails, we don't report it, as the frequency
+ * change succeeded. The voltage reduction is not a critical failure,
+ * only power savings will suffer from this.
+ *
+ * Note: if the voltage change fails, and a return value is returned, a
+ * bug is triggered (seems a deadlock). Should anybody find out where,
+ * the "return 0" should become a "return ret".
+ */
+ if (vcc_core && freqs.new < freqs.old)
+ ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
+
+ return 0;
+}
+
+static int pxa_cpufreq_init(struct cpufreq_policy *policy)
+{
+ int i;
+ unsigned int freq;
+ struct cpufreq_frequency_table *pxa255_freq_table;
+ pxa_freqs_t *pxa255_freqs;
+
+ /* try to guess pxa27x cpu */
+ if (cpu_is_pxa27x())
+ pxa27x_guess_max_freq();
+
+ pxa_cpufreq_init_voltages();
+
+ init_sdram_rows();
+
+ /* set default policy and cpuinfo */
+ policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
+ policy->cur = get_clk_frequency_khz(0); /* current freq */
+ policy->min = policy->max = policy->cur;
+
+ /* Generate pxa25x the run cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
+ pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
+ pxa255_run_freq_table[i].index = i;
+ }
+ pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+ /* Generate pxa25x the turbo cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
+ pxa255_turbo_freq_table[i].frequency =
+ pxa255_turbo_freqs[i].khz;
+ pxa255_turbo_freq_table[i].index = i;
+ }
+ pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+ pxa255_turbo_table = !!pxa255_turbo_table;
+
+ /* Generate the pxa27x cpufreq_frequency_table struct */
+ for (i = 0; i < NUM_PXA27x_FREQS; i++) {
+ freq = pxa27x_freqs[i].khz;
+ if (freq > pxa27x_maxfreq)
+ break;
+ pxa27x_freq_table[i].frequency = freq;
+ pxa27x_freq_table[i].index = i;
+ }
+ pxa27x_freq_table[i].index = i;
+ pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+ /*
+ * Set the policy's minimum and maximum frequencies from the tables
+ * just constructed. This sets cpuinfo.mxx_freq, min and max.
+ */
+ if (cpu_is_pxa25x()) {
+ find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
+ pr_info("PXA255 cpufreq using %s frequency table\n",
+ pxa255_turbo_table ? "turbo" : "run");
+ cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table);
+ }
+ else if (cpu_is_pxa27x())
+ cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table);
+
+ printk(KERN_INFO "PXA CPU frequency change support initialized\n");
+
+ return 0;
+}
+
+static struct cpufreq_driver pxa_cpufreq_driver = {
+ .verify = pxa_verify_policy,
+ .target = pxa_set_target,
+ .init = pxa_cpufreq_init,
+ .get = pxa_cpufreq_get,
+ .name = "PXA2xx",
+};
+
+static int __init pxa_cpu_init(void)
+{
+ int ret = -ENODEV;
+ if (cpu_is_pxa25x() || cpu_is_pxa27x())
+ ret = cpufreq_register_driver(&pxa_cpufreq_driver);
+ return ret;
+}
+
+static void __exit pxa_cpu_exit(void)
+{
+ cpufreq_unregister_driver(&pxa_cpufreq_driver);
+}
+
+
+MODULE_AUTHOR("Intrinsyc Software Inc.");
+MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
+MODULE_LICENSE("GPL");
+module_init(pxa_cpu_init);
+module_exit(pxa_cpu_exit);
diff --git a/drivers/cpufreq/pxa3xx-cpufreq.c b/drivers/cpufreq/pxa3xx-cpufreq.c
new file mode 100644
index 000000000000..15d60f857ad5
--- /dev/null
+++ b/drivers/cpufreq/pxa3xx-cpufreq.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (C) 2008 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <mach/generic.h>
+#include <mach/pxa3xx-regs.h>
+
+#define HSS_104M (0)
+#define HSS_156M (1)
+#define HSS_208M (2)
+#define HSS_312M (3)
+
+#define SMCFS_78M (0)
+#define SMCFS_104M (2)
+#define SMCFS_208M (5)
+
+#define SFLFS_104M (0)
+#define SFLFS_156M (1)
+#define SFLFS_208M (2)
+#define SFLFS_312M (3)
+
+#define XSPCLK_156M (0)
+#define XSPCLK_NONE (3)
+
+#define DMCFS_26M (0)
+#define DMCFS_260M (3)
+
+struct pxa3xx_freq_info {
+ unsigned int cpufreq_mhz;
+ unsigned int core_xl : 5;
+ unsigned int core_xn : 3;
+ unsigned int hss : 2;
+ unsigned int dmcfs : 2;
+ unsigned int smcfs : 3;
+ unsigned int sflfs : 2;
+ unsigned int df_clkdiv : 3;
+
+ int vcc_core; /* in mV */
+ int vcc_sram; /* in mV */
+};
+
+#define OP(cpufreq, _xl, _xn, _hss, _dmc, _smc, _sfl, _dfi, vcore, vsram) \
+{ \
+ .cpufreq_mhz = cpufreq, \
+ .core_xl = _xl, \
+ .core_xn = _xn, \
+ .hss = HSS_##_hss##M, \
+ .dmcfs = DMCFS_##_dmc##M, \
+ .smcfs = SMCFS_##_smc##M, \
+ .sflfs = SFLFS_##_sfl##M, \
+ .df_clkdiv = _dfi, \
+ .vcc_core = vcore, \
+ .vcc_sram = vsram, \
+}
+
+static struct pxa3xx_freq_info pxa300_freqs[] = {
+ /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */
+ OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */
+ OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */
+ OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */
+ OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */
+};
+
+static struct pxa3xx_freq_info pxa320_freqs[] = {
+ /* CPU XL XN HSS DMEM SMEM SRAM DFI VCC_CORE VCC_SRAM */
+ OP(104, 8, 1, 104, 260, 78, 104, 3, 1000, 1100), /* 104MHz */
+ OP(208, 16, 1, 104, 260, 104, 156, 2, 1000, 1100), /* 208MHz */
+ OP(416, 16, 2, 156, 260, 104, 208, 2, 1100, 1200), /* 416MHz */
+ OP(624, 24, 2, 208, 260, 208, 312, 3, 1375, 1400), /* 624MHz */
+ OP(806, 31, 2, 208, 260, 208, 312, 3, 1400, 1400), /* 806MHz */
+};
+
+static unsigned int pxa3xx_freqs_num;
+static struct pxa3xx_freq_info *pxa3xx_freqs;
+static struct cpufreq_frequency_table *pxa3xx_freqs_table;
+
+static int setup_freqs_table(struct cpufreq_policy *policy,
+ struct pxa3xx_freq_info *freqs, int num)
+{
+ struct cpufreq_frequency_table *table;
+ int i;
+
+ table = kzalloc((num + 1) * sizeof(*table), GFP_KERNEL);
+ if (table == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < num; i++) {
+ table[i].index = i;
+ table[i].frequency = freqs[i].cpufreq_mhz * 1000;
+ }
+ table[num].index = i;
+ table[num].frequency = CPUFREQ_TABLE_END;
+
+ pxa3xx_freqs = freqs;
+ pxa3xx_freqs_num = num;
+ pxa3xx_freqs_table = table;
+
+ return cpufreq_frequency_table_cpuinfo(policy, table);
+}
+
+static void __update_core_freq(struct pxa3xx_freq_info *info)
+{
+ uint32_t mask = ACCR_XN_MASK | ACCR_XL_MASK;
+ uint32_t accr = ACCR;
+ uint32_t xclkcfg;
+
+ accr &= ~(ACCR_XN_MASK | ACCR_XL_MASK | ACCR_XSPCLK_MASK);
+ accr |= ACCR_XN(info->core_xn) | ACCR_XL(info->core_xl);
+
+ /* No clock until core PLL is re-locked */
+ accr |= ACCR_XSPCLK(XSPCLK_NONE);
+
+ xclkcfg = (info->core_xn == 2) ? 0x3 : 0x2; /* turbo bit */
+
+ ACCR = accr;
+ __asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg));
+
+ while ((ACSR & mask) != (accr & mask))
+ cpu_relax();
+}
+
+static void __update_bus_freq(struct pxa3xx_freq_info *info)
+{
+ uint32_t mask;
+ uint32_t accr = ACCR;
+
+ mask = ACCR_SMCFS_MASK | ACCR_SFLFS_MASK | ACCR_HSS_MASK |
+ ACCR_DMCFS_MASK;
+
+ accr &= ~mask;
+ accr |= ACCR_SMCFS(info->smcfs) | ACCR_SFLFS(info->sflfs) |
+ ACCR_HSS(info->hss) | ACCR_DMCFS(info->dmcfs);
+
+ ACCR = accr;
+
+ while ((ACSR & mask) != (accr & mask))
+ cpu_relax();
+}
+
+static int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, pxa3xx_freqs_table);
+}
+
+static unsigned int pxa3xx_cpufreq_get(unsigned int cpu)
+{
+ return pxa3xx_get_clk_frequency_khz(0);
+}
+
+static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct pxa3xx_freq_info *next;
+ struct cpufreq_freqs freqs;
+ unsigned long flags;
+ int idx;
+
+ if (policy->cpu != 0)
+ return -EINVAL;
+
+ /* Lookup the next frequency */
+ if (cpufreq_frequency_table_target(policy, pxa3xx_freqs_table,
+ target_freq, relation, &idx))
+ return -EINVAL;
+
+ next = &pxa3xx_freqs[idx];
+
+ freqs.old = policy->cur;
+ freqs.new = next->cpufreq_mhz * 1000;
+
+ pr_debug("CPU frequency from %d MHz to %d MHz%s\n",
+ freqs.old / 1000, freqs.new / 1000,
+ (freqs.old == freqs.new) ? " (skipped)" : "");
+
+ if (freqs.old == target_freq)
+ return 0;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ local_irq_save(flags);
+ __update_core_freq(next);
+ __update_bus_freq(next);
+ local_irq_restore(flags);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static int pxa3xx_cpufreq_init(struct cpufreq_policy *policy)
+{
+ int ret = -EINVAL;
+
+ /* set default policy and cpuinfo */
+ policy->cpuinfo.min_freq = 104000;
+ policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000;
+ policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
+ policy->max = pxa3xx_get_clk_frequency_khz(0);
+ policy->cur = policy->min = policy->max;
+
+ if (cpu_is_pxa300() || cpu_is_pxa310())
+ ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs));
+
+ if (cpu_is_pxa320())
+ ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa320_freqs));
+
+ if (ret) {
+ pr_err("failed to setup frequency table\n");
+ return ret;
+ }
+
+ pr_info("CPUFREQ support for PXA3xx initialized\n");
+ return 0;
+}
+
+static struct cpufreq_driver pxa3xx_cpufreq_driver = {
+ .verify = pxa3xx_cpufreq_verify,
+ .target = pxa3xx_cpufreq_set,
+ .init = pxa3xx_cpufreq_init,
+ .get = pxa3xx_cpufreq_get,
+ .name = "pxa3xx-cpufreq",
+};
+
+static int __init cpufreq_init(void)
+{
+ if (cpu_is_pxa3xx())
+ return cpufreq_register_driver(&pxa3xx_cpufreq_driver);
+
+ return 0;
+}
+module_init(cpufreq_init);
+
+static void __exit cpufreq_exit(void)
+{
+ cpufreq_unregister_driver(&pxa3xx_cpufreq_driver);
+}
+module_exit(cpufreq_exit);
+
+MODULE_DESCRIPTION("CPU frequency scaling driver for PXA3xx");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/s3c2416-cpufreq.c b/drivers/cpufreq/s3c2416-cpufreq.c
index bcc053bc02c4..4f1881eee3f1 100644
--- a/drivers/cpufreq/s3c2416-cpufreq.c
+++ b/drivers/cpufreq/s3c2416-cpufreq.c
@@ -256,7 +256,6 @@ static int s3c2416_cpufreq_set_target(struct cpufreq_policy *policy,
goto out;
}
- freqs.cpu = 0;
freqs.flags = 0;
freqs.old = s3c_freq->is_dvs ? FREQ_DVS
: clk_get_rate(s3c_freq->armclk) / 1000;
@@ -274,7 +273,7 @@ static int s3c2416_cpufreq_set_target(struct cpufreq_policy *policy,
if (!to_dvs && freqs.old == freqs.new)
goto out;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
if (to_dvs) {
pr_debug("cpufreq: enter dvs\n");
@@ -287,7 +286,7 @@ static int s3c2416_cpufreq_set_target(struct cpufreq_policy *policy,
ret = s3c2416_cpufreq_set_armdiv(s3c_freq, freqs.new);
}
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
out:
mutex_unlock(&cpufreq_lock);
diff --git a/drivers/cpufreq/s3c64xx-cpufreq.c b/drivers/cpufreq/s3c64xx-cpufreq.c
index 6f9490b3c356..27cacb524796 100644
--- a/drivers/cpufreq/s3c64xx-cpufreq.c
+++ b/drivers/cpufreq/s3c64xx-cpufreq.c
@@ -84,7 +84,6 @@ static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
if (ret != 0)
return ret;
- freqs.cpu = 0;
freqs.old = clk_get_rate(armclk) / 1000;
freqs.new = s3c64xx_freq_table[i].frequency;
freqs.flags = 0;
@@ -95,7 +94,7 @@ static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
pr_debug("Transition %d-%dkHz\n", freqs.old, freqs.new);
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
#ifdef CONFIG_REGULATOR
if (vddarm && freqs.new > freqs.old) {
@@ -117,7 +116,7 @@ static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
goto err;
}
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
#ifdef CONFIG_REGULATOR
if (vddarm && freqs.new < freqs.old) {
@@ -141,7 +140,7 @@ err_clk:
if (clk_set_rate(armclk, freqs.old * 1000) < 0)
pr_err("Failed to restore original clock rate\n");
err:
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return ret;
}
diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index a484aaea9809..5c7757073793 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -229,7 +229,6 @@ static int s5pv210_target(struct cpufreq_policy *policy,
}
freqs.new = s5pv210_freq_table[index].frequency;
- freqs.cpu = 0;
if (freqs.new == freqs.old)
goto exit;
@@ -256,7 +255,7 @@ static int s5pv210_target(struct cpufreq_policy *policy,
goto exit;
}
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Check if there need to change PLL */
if ((index == L0) || (priv_index == L0))
@@ -468,7 +467,7 @@ static int s5pv210_target(struct cpufreq_policy *policy,
}
}
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
if (freqs.new < freqs.old) {
regulator_set_voltage(int_regulator,
diff --git a/drivers/cpufreq/sa1100-cpufreq.c b/drivers/cpufreq/sa1100-cpufreq.c
new file mode 100644
index 000000000000..cff18e87ca58
--- /dev/null
+++ b/drivers/cpufreq/sa1100-cpufreq.c
@@ -0,0 +1,247 @@
+/*
+ * cpu-sa1100.c: clock scaling for the SA1100
+ *
+ * Copyright (C) 2000 2001, The Delft University of Technology
+ *
+ * Authors:
+ * - Johan Pouwelse (J.A.Pouwelse@its.tudelft.nl): initial version
+ * - Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
+ * - major rewrite for linux-2.3.99
+ * - rewritten for the more generic power management scheme in
+ * linux-2.4.5-rmk1
+ *
+ * This software has been developed while working on the LART
+ * computing board (http://www.lartmaker.nl/), which is
+ * sponsored by the Mobile Multi-media Communications
+ * (http://www.mobimedia.org/) and Ubiquitous Communications
+ * (http://www.ubicom.tudelft.nl/) projects.
+ *
+ * The authors can be reached at:
+ *
+ * Erik Mouw
+ * Information and Communication Theory Group
+ * Faculty of Information Technology and Systems
+ * Delft University of Technology
+ * P.O. Box 5031
+ * 2600 GA Delft
+ * The Netherlands
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Theory of operations
+ * ====================
+ *
+ * Clock scaling can be used to lower the power consumption of the CPU
+ * core. This will give you a somewhat longer running time.
+ *
+ * The SA-1100 has a single register to change the core clock speed:
+ *
+ * PPCR 0x90020014 PLL config
+ *
+ * However, the DRAM timings are closely related to the core clock
+ * speed, so we need to change these, too. The used registers are:
+ *
+ * MDCNFG 0xA0000000 DRAM config
+ * MDCAS0 0xA0000004 Access waveform
+ * MDCAS1 0xA0000008 Access waveform
+ * MDCAS2 0xA000000C Access waveform
+ *
+ * Care must be taken to change the DRAM parameters the correct way,
+ * because otherwise the DRAM becomes unusable and the kernel will
+ * crash.
+ *
+ * The simple solution to avoid a kernel crash is to put the actual
+ * clock change in ROM and jump to that code from the kernel. The main
+ * disadvantage is that the ROM has to be modified, which is not
+ * possible on all SA-1100 platforms. Another disadvantage is that
+ * jumping to ROM makes clock switching unnecessary complicated.
+ *
+ * The idea behind this driver is that the memory configuration can be
+ * changed while running from DRAM (even with interrupts turned on!)
+ * as long as all re-configuration steps yield a valid DRAM
+ * configuration. The advantages are clear: it will run on all SA-1100
+ * platforms, and the code is very simple.
+ *
+ * If you really want to understand what is going on in
+ * sa1100_update_dram_timings(), you'll have to read sections 8.2,
+ * 9.5.7.3, and 10.2 from the "Intel StrongARM SA-1100 Microprocessor
+ * Developers Manual" (available for free from Intel).
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/cpufreq.h>
+#include <linux/io.h>
+
+#include <asm/cputype.h>
+
+#include <mach/generic.h>
+#include <mach/hardware.h>
+
+struct sa1100_dram_regs {
+ int speed;
+ u32 mdcnfg;
+ u32 mdcas0;
+ u32 mdcas1;
+ u32 mdcas2;
+};
+
+
+static struct cpufreq_driver sa1100_driver;
+
+static struct sa1100_dram_regs sa1100_dram_settings[] = {
+ /*speed, mdcnfg, mdcas0, mdcas1, mdcas2, clock freq */
+ { 59000, 0x00dc88a3, 0xcccccccf, 0xfffffffc, 0xffffffff},/* 59.0 MHz */
+ { 73700, 0x011490a3, 0xcccccccf, 0xfffffffc, 0xffffffff},/* 73.7 MHz */
+ { 88500, 0x014e90a3, 0xcccccccf, 0xfffffffc, 0xffffffff},/* 88.5 MHz */
+ {103200, 0x01889923, 0xcccccccf, 0xfffffffc, 0xffffffff},/* 103.2 MHz */
+ {118000, 0x01c29923, 0x9999998f, 0xfffffff9, 0xffffffff},/* 118.0 MHz */
+ {132700, 0x01fb2123, 0x9999998f, 0xfffffff9, 0xffffffff},/* 132.7 MHz */
+ {147500, 0x02352123, 0x3333330f, 0xfffffff3, 0xffffffff},/* 147.5 MHz */
+ {162200, 0x026b29a3, 0x38e38e1f, 0xfff8e38e, 0xffffffff},/* 162.2 MHz */
+ {176900, 0x02a329a3, 0x71c71c1f, 0xfff1c71c, 0xffffffff},/* 176.9 MHz */
+ {191700, 0x02dd31a3, 0xe38e383f, 0xffe38e38, 0xffffffff},/* 191.7 MHz */
+ {206400, 0x03153223, 0xc71c703f, 0xffc71c71, 0xffffffff},/* 206.4 MHz */
+ {221200, 0x034fba23, 0xc71c703f, 0xffc71c71, 0xffffffff},/* 221.2 MHz */
+ {235900, 0x03853a23, 0xe1e1e07f, 0xe1e1e1e1, 0xffffffe1},/* 235.9 MHz */
+ {250700, 0x03bf3aa3, 0xc3c3c07f, 0xc3c3c3c3, 0xffffffc3},/* 250.7 MHz */
+ {265400, 0x03f7c2a3, 0xc3c3c07f, 0xc3c3c3c3, 0xffffffc3},/* 265.4 MHz */
+ {280200, 0x0431c2a3, 0x878780ff, 0x87878787, 0xffffff87},/* 280.2 MHz */
+ { 0, 0, 0, 0, 0 } /* last entry */
+};
+
+static void sa1100_update_dram_timings(int current_speed, int new_speed)
+{
+ struct sa1100_dram_regs *settings = sa1100_dram_settings;
+
+ /* find speed */
+ while (settings->speed != 0) {
+ if (new_speed == settings->speed)
+ break;
+
+ settings++;
+ }
+
+ if (settings->speed == 0) {
+ panic("%s: couldn't find dram setting for speed %d\n",
+ __func__, new_speed);
+ }
+
+ /* No risk, no fun: run with interrupts on! */
+ if (new_speed > current_speed) {
+ /* We're going FASTER, so first relax the memory
+ * timings before changing the core frequency
+ */
+
+ /* Half the memory access clock */
+ MDCNFG |= MDCNFG_CDB2;
+
+ /* The order of these statements IS important, keep 8
+ * pulses!!
+ */
+ MDCAS2 = settings->mdcas2;
+ MDCAS1 = settings->mdcas1;
+ MDCAS0 = settings->mdcas0;
+ MDCNFG = settings->mdcnfg;
+ } else {
+ /* We're going SLOWER: first decrease the core
+ * frequency and then tighten the memory settings.
+ */
+
+ /* Half the memory access clock */
+ MDCNFG |= MDCNFG_CDB2;
+
+ /* The order of these statements IS important, keep 8
+ * pulses!!
+ */
+ MDCAS0 = settings->mdcas0;
+ MDCAS1 = settings->mdcas1;
+ MDCAS2 = settings->mdcas2;
+ MDCNFG = settings->mdcnfg;
+ }
+}
+
+static int sa1100_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int cur = sa11x0_getspeed(0);
+ unsigned int new_ppcr;
+ struct cpufreq_freqs freqs;
+
+ new_ppcr = sa11x0_freq_to_ppcr(target_freq);
+ switch (relation) {
+ case CPUFREQ_RELATION_L:
+ if (sa11x0_ppcr_to_freq(new_ppcr) > policy->max)
+ new_ppcr--;
+ break;
+ case CPUFREQ_RELATION_H:
+ if ((sa11x0_ppcr_to_freq(new_ppcr) > target_freq) &&
+ (sa11x0_ppcr_to_freq(new_ppcr - 1) >= policy->min))
+ new_ppcr--;
+ break;
+ }
+
+ freqs.old = cur;
+ freqs.new = sa11x0_ppcr_to_freq(new_ppcr);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ if (freqs.new > cur)
+ sa1100_update_dram_timings(cur, freqs.new);
+
+ PPCR = new_ppcr;
+
+ if (freqs.new < cur)
+ sa1100_update_dram_timings(cur, freqs.new);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static int __init sa1100_cpu_init(struct cpufreq_policy *policy)
+{
+ if (policy->cpu != 0)
+ return -EINVAL;
+ policy->cur = policy->min = policy->max = sa11x0_getspeed(0);
+ policy->cpuinfo.min_freq = 59000;
+ policy->cpuinfo.max_freq = 287000;
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ return 0;
+}
+
+static struct cpufreq_driver sa1100_driver __refdata = {
+ .flags = CPUFREQ_STICKY,
+ .verify = sa11x0_verify_speed,
+ .target = sa1100_target,
+ .get = sa11x0_getspeed,
+ .init = sa1100_cpu_init,
+ .name = "sa1100",
+};
+
+static int __init sa1100_dram_init(void)
+{
+ if (cpu_is_sa1100())
+ return cpufreq_register_driver(&sa1100_driver);
+ else
+ return -ENODEV;
+}
+
+arch_initcall(sa1100_dram_init);
diff --git a/drivers/cpufreq/sa1110-cpufreq.c b/drivers/cpufreq/sa1110-cpufreq.c
new file mode 100644
index 000000000000..39c90b6f4286
--- /dev/null
+++ b/drivers/cpufreq/sa1110-cpufreq.c
@@ -0,0 +1,406 @@
+/*
+ * linux/arch/arm/mach-sa1100/cpu-sa1110.c
+ *
+ * Copyright (C) 2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Note: there are two erratas that apply to the SA1110 here:
+ * 7 - SDRAM auto-power-up failure (rev A0)
+ * 13 - Corruption of internal register reads/writes following
+ * SDRAM reads (rev A0, B0, B1)
+ *
+ * We ignore rev. A0 and B0 devices; I don't think they're worth supporting.
+ *
+ * The SDRAM type can be passed on the command line as cpu_sa1110.sdram=type
+ */
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <asm/cputype.h>
+#include <asm/mach-types.h>
+
+#include <mach/generic.h>
+#include <mach/hardware.h>
+
+#undef DEBUG
+
+struct sdram_params {
+ const char name[20];
+ u_char rows; /* bits */
+ u_char cas_latency; /* cycles */
+ u_char tck; /* clock cycle time (ns) */
+ u_char trcd; /* activate to r/w (ns) */
+ u_char trp; /* precharge to activate (ns) */
+ u_char twr; /* write recovery time (ns) */
+ u_short refresh; /* refresh time for array (us) */
+};
+
+struct sdram_info {
+ u_int mdcnfg;
+ u_int mdrefr;
+ u_int mdcas[3];
+};
+
+static struct sdram_params sdram_tbl[] __initdata = {
+ { /* Toshiba TC59SM716 CL2 */
+ .name = "TC59SM716-CL2",
+ .rows = 12,
+ .tck = 10,
+ .trcd = 20,
+ .trp = 20,
+ .twr = 10,
+ .refresh = 64000,
+ .cas_latency = 2,
+ }, { /* Toshiba TC59SM716 CL3 */
+ .name = "TC59SM716-CL3",
+ .rows = 12,
+ .tck = 8,
+ .trcd = 20,
+ .trp = 20,
+ .twr = 8,
+ .refresh = 64000,
+ .cas_latency = 3,
+ }, { /* Samsung K4S641632D TC75 */
+ .name = "K4S641632D",
+ .rows = 14,
+ .tck = 9,
+ .trcd = 27,
+ .trp = 20,
+ .twr = 9,
+ .refresh = 64000,
+ .cas_latency = 3,
+ }, { /* Samsung K4S281632B-1H */
+ .name = "K4S281632B-1H",
+ .rows = 12,
+ .tck = 10,
+ .trp = 20,
+ .twr = 10,
+ .refresh = 64000,
+ .cas_latency = 3,
+ }, { /* Samsung KM416S4030CT */
+ .name = "KM416S4030CT",
+ .rows = 13,
+ .tck = 8,
+ .trcd = 24, /* 3 CLKs */
+ .trp = 24, /* 3 CLKs */
+ .twr = 16, /* Trdl: 2 CLKs */
+ .refresh = 64000,
+ .cas_latency = 3,
+ }, { /* Winbond W982516AH75L CL3 */
+ .name = "W982516AH75L",
+ .rows = 16,
+ .tck = 8,
+ .trcd = 20,
+ .trp = 20,
+ .twr = 8,
+ .refresh = 64000,
+ .cas_latency = 3,
+ }, { /* Micron MT48LC8M16A2TG-75 */
+ .name = "MT48LC8M16A2TG-75",
+ .rows = 12,
+ .tck = 8,
+ .trcd = 20,
+ .trp = 20,
+ .twr = 8,
+ .refresh = 64000,
+ .cas_latency = 3,
+ },
+};
+
+static struct sdram_params sdram_params;
+
+/*
+ * Given a period in ns and frequency in khz, calculate the number of
+ * cycles of frequency in period. Note that we round up to the next
+ * cycle, even if we are only slightly over.
+ */
+static inline u_int ns_to_cycles(u_int ns, u_int khz)
+{
+ return (ns * khz + 999999) / 1000000;
+}
+
+/*
+ * Create the MDCAS register bit pattern.
+ */
+static inline void set_mdcas(u_int *mdcas, int delayed, u_int rcd)
+{
+ u_int shift;
+
+ rcd = 2 * rcd - 1;
+ shift = delayed + 1 + rcd;
+
+ mdcas[0] = (1 << rcd) - 1;
+ mdcas[0] |= 0x55555555 << shift;
+ mdcas[1] = mdcas[2] = 0x55555555 << (shift & 1);
+}
+
+static void
+sdram_calculate_timing(struct sdram_info *sd, u_int cpu_khz,
+ struct sdram_params *sdram)
+{
+ u_int mem_khz, sd_khz, trp, twr;
+
+ mem_khz = cpu_khz / 2;
+ sd_khz = mem_khz;
+
+ /*
+ * If SDCLK would invalidate the SDRAM timings,
+ * run SDCLK at half speed.
+ *
+ * CPU steppings prior to B2 must either run the memory at
+ * half speed or use delayed read latching (errata 13).
+ */
+ if ((ns_to_cycles(sdram->tck, sd_khz) > 1) ||
+ (CPU_REVISION < CPU_SA1110_B2 && sd_khz < 62000))
+ sd_khz /= 2;
+
+ sd->mdcnfg = MDCNFG & 0x007f007f;
+
+ twr = ns_to_cycles(sdram->twr, mem_khz);
+
+ /* trp should always be >1 */
+ trp = ns_to_cycles(sdram->trp, mem_khz) - 1;
+ if (trp < 1)
+ trp = 1;
+
+ sd->mdcnfg |= trp << 8;
+ sd->mdcnfg |= trp << 24;
+ sd->mdcnfg |= sdram->cas_latency << 12;
+ sd->mdcnfg |= sdram->cas_latency << 28;
+ sd->mdcnfg |= twr << 14;
+ sd->mdcnfg |= twr << 30;
+
+ sd->mdrefr = MDREFR & 0xffbffff0;
+ sd->mdrefr |= 7;
+
+ if (sd_khz != mem_khz)
+ sd->mdrefr |= MDREFR_K1DB2;
+
+ /* initial number of '1's in MDCAS + 1 */
+ set_mdcas(sd->mdcas, sd_khz >= 62000,
+ ns_to_cycles(sdram->trcd, mem_khz));
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "MDCNFG: %08x MDREFR: %08x MDCAS0: %08x MDCAS1: %08x MDCAS2: %08x\n",
+ sd->mdcnfg, sd->mdrefr, sd->mdcas[0], sd->mdcas[1],
+ sd->mdcas[2]);
+#endif
+}
+
+/*
+ * Set the SDRAM refresh rate.
+ */
+static inline void sdram_set_refresh(u_int dri)
+{
+ MDREFR = (MDREFR & 0xffff000f) | (dri << 4);
+ (void) MDREFR;
+}
+
+/*
+ * Update the refresh period. We do this such that we always refresh
+ * the SDRAMs within their permissible period. The refresh period is
+ * always a multiple of the memory clock (fixed at cpu_clock / 2).
+ *
+ * FIXME: we don't currently take account of burst accesses here,
+ * but neither do Intels DM nor Angel.
+ */
+static void
+sdram_update_refresh(u_int cpu_khz, struct sdram_params *sdram)
+{
+ u_int ns_row = (sdram->refresh * 1000) >> sdram->rows;
+ u_int dri = ns_to_cycles(ns_row, cpu_khz / 2) / 32;
+
+#ifdef DEBUG
+ mdelay(250);
+ printk(KERN_DEBUG "new dri value = %d\n", dri);
+#endif
+
+ sdram_set_refresh(dri);
+}
+
+/*
+ * Ok, set the CPU frequency.
+ */
+static int sa1110_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ struct sdram_params *sdram = &sdram_params;
+ struct cpufreq_freqs freqs;
+ struct sdram_info sd;
+ unsigned long flags;
+ unsigned int ppcr, unused;
+
+ switch (relation) {
+ case CPUFREQ_RELATION_L:
+ ppcr = sa11x0_freq_to_ppcr(target_freq);
+ if (sa11x0_ppcr_to_freq(ppcr) > policy->max)
+ ppcr--;
+ break;
+ case CPUFREQ_RELATION_H:
+ ppcr = sa11x0_freq_to_ppcr(target_freq);
+ if (ppcr && (sa11x0_ppcr_to_freq(ppcr) > target_freq) &&
+ (sa11x0_ppcr_to_freq(ppcr-1) >= policy->min))
+ ppcr--;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ freqs.old = sa11x0_getspeed(0);
+ freqs.new = sa11x0_ppcr_to_freq(ppcr);
+
+ sdram_calculate_timing(&sd, freqs.new, sdram);
+
+#if 0
+ /*
+ * These values are wrong according to the SA1110 documentation
+ * and errata, but they seem to work. Need to get a storage
+ * scope on to the SDRAM signals to work out why.
+ */
+ if (policy->max < 147500) {
+ sd.mdrefr |= MDREFR_K1DB2;
+ sd.mdcas[0] = 0xaaaaaa7f;
+ } else {
+ sd.mdrefr &= ~MDREFR_K1DB2;
+ sd.mdcas[0] = 0xaaaaaa9f;
+ }
+ sd.mdcas[1] = 0xaaaaaaaa;
+ sd.mdcas[2] = 0xaaaaaaaa;
+#endif
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ /*
+ * The clock could be going away for some time. Set the SDRAMs
+ * to refresh rapidly (every 64 memory clock cycles). To get
+ * through the whole array, we need to wait 262144 mclk cycles.
+ * We wait 20ms to be safe.
+ */
+ sdram_set_refresh(2);
+ if (!irqs_disabled())
+ msleep(20);
+ else
+ mdelay(20);
+
+ /*
+ * Reprogram the DRAM timings with interrupts disabled, and
+ * ensure that we are doing this within a complete cache line.
+ * This means that we won't access SDRAM for the duration of
+ * the programming.
+ */
+ local_irq_save(flags);
+ asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
+ udelay(10);
+ __asm__ __volatile__("\n\
+ b 2f \n\
+ .align 5 \n\
+1: str %3, [%1, #0] @ MDCNFG \n\
+ str %4, [%1, #28] @ MDREFR \n\
+ str %5, [%1, #4] @ MDCAS0 \n\
+ str %6, [%1, #8] @ MDCAS1 \n\
+ str %7, [%1, #12] @ MDCAS2 \n\
+ str %8, [%2, #0] @ PPCR \n\
+ ldr %0, [%1, #0] \n\
+ b 3f \n\
+2: b 1b \n\
+3: nop \n\
+ nop"
+ : "=&r" (unused)
+ : "r" (&MDCNFG), "r" (&PPCR), "0" (sd.mdcnfg),
+ "r" (sd.mdrefr), "r" (sd.mdcas[0]),
+ "r" (sd.mdcas[1]), "r" (sd.mdcas[2]), "r" (ppcr));
+ local_irq_restore(flags);
+
+ /*
+ * Now, return the SDRAM refresh back to normal.
+ */
+ sdram_update_refresh(freqs.new, sdram);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static int __init sa1110_cpu_init(struct cpufreq_policy *policy)
+{
+ if (policy->cpu != 0)
+ return -EINVAL;
+ policy->cur = policy->min = policy->max = sa11x0_getspeed(0);
+ policy->cpuinfo.min_freq = 59000;
+ policy->cpuinfo.max_freq = 287000;
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ return 0;
+}
+
+/* sa1110_driver needs __refdata because it must remain after init registers
+ * it with cpufreq_register_driver() */
+static struct cpufreq_driver sa1110_driver __refdata = {
+ .flags = CPUFREQ_STICKY,
+ .verify = sa11x0_verify_speed,
+ .target = sa1110_target,
+ .get = sa11x0_getspeed,
+ .init = sa1110_cpu_init,
+ .name = "sa1110",
+};
+
+static struct sdram_params *sa1110_find_sdram(const char *name)
+{
+ struct sdram_params *sdram;
+
+ for (sdram = sdram_tbl; sdram < sdram_tbl + ARRAY_SIZE(sdram_tbl);
+ sdram++)
+ if (strcmp(name, sdram->name) == 0)
+ return sdram;
+
+ return NULL;
+}
+
+static char sdram_name[16];
+
+static int __init sa1110_clk_init(void)
+{
+ struct sdram_params *sdram;
+ const char *name = sdram_name;
+
+ if (!cpu_is_sa1110())
+ return -ENODEV;
+
+ if (!name[0]) {
+ if (machine_is_assabet())
+ name = "TC59SM716-CL3";
+ if (machine_is_pt_system3())
+ name = "K4S641632D";
+ if (machine_is_h3100())
+ name = "KM416S4030CT";
+ if (machine_is_jornada720())
+ name = "K4S281632B-1H";
+ if (machine_is_nanoengine())
+ name = "MT48LC8M16A2TG-75";
+ }
+
+ sdram = sa1110_find_sdram(name);
+ if (sdram) {
+ printk(KERN_DEBUG "SDRAM: tck: %d trcd: %d trp: %d"
+ " twr: %d refresh: %d cas_latency: %d\n",
+ sdram->tck, sdram->trcd, sdram->trp,
+ sdram->twr, sdram->refresh, sdram->cas_latency);
+
+ memcpy(&sdram_params, sdram, sizeof(sdram_params));
+
+ return cpufreq_register_driver(&sa1110_driver);
+ }
+
+ return 0;
+}
+
+module_param_string(sdram, sdram_name, sizeof(sdram_name), 0);
+arch_initcall(sa1110_clk_init);
diff --git a/drivers/cpufreq/sc520_freq.c b/drivers/cpufreq/sc520_freq.c
index e42e073cd9b8..f740b134d27b 100644
--- a/drivers/cpufreq/sc520_freq.c
+++ b/drivers/cpufreq/sc520_freq.c
@@ -53,7 +53,8 @@ static unsigned int sc520_freq_get_cpu_frequency(unsigned int cpu)
}
}
-static void sc520_freq_set_cpu_state(unsigned int state)
+static void sc520_freq_set_cpu_state(struct cpufreq_policy *policy,
+ unsigned int state)
{
struct cpufreq_freqs freqs;
@@ -61,9 +62,8 @@ static void sc520_freq_set_cpu_state(unsigned int state)
freqs.old = sc520_freq_get_cpu_frequency(0);
freqs.new = sc520_freq_table[state].frequency;
- freqs.cpu = 0; /* AMD Elan is UP */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
pr_debug("attempting to set frequency to %i kHz\n",
sc520_freq_table[state].frequency);
@@ -75,7 +75,7 @@ static void sc520_freq_set_cpu_state(unsigned int state)
local_irq_enable();
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
};
static int sc520_freq_verify(struct cpufreq_policy *policy)
@@ -93,7 +93,7 @@ static int sc520_freq_target(struct cpufreq_policy *policy,
target_freq, relation, &newstate))
return -EINVAL;
- sc520_freq_set_cpu_state(newstate);
+ sc520_freq_set_cpu_state(policy, newstate);
return 0;
}
diff --git a/drivers/cpufreq/sh-cpufreq.c b/drivers/cpufreq/sh-cpufreq.c
new file mode 100644
index 000000000000..73adb64651e8
--- /dev/null
+++ b/drivers/cpufreq/sh-cpufreq.c
@@ -0,0 +1,189 @@
+/*
+ * cpufreq driver for the SuperH processors.
+ *
+ * Copyright (C) 2002 - 2012 Paul Mundt
+ * Copyright (C) 2002 M. R. Brown
+ *
+ * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
+ *
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#define pr_fmt(fmt) "cpufreq: " fmt
+
+#include <linux/types.h>
+#include <linux/cpufreq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/cpumask.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/sched.h> /* set_cpus_allowed() */
+#include <linux/clk.h>
+#include <linux/percpu.h>
+#include <linux/sh_clk.h>
+
+static DEFINE_PER_CPU(struct clk, sh_cpuclk);
+
+static unsigned int sh_cpufreq_get(unsigned int cpu)
+{
+ return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
+}
+
+/*
+ * Here we notify other drivers of the proposed change and the final change.
+ */
+static int sh_cpufreq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
+ cpumask_t cpus_allowed;
+ struct cpufreq_freqs freqs;
+ struct device *dev;
+ long freq;
+
+ cpus_allowed = current->cpus_allowed;
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ BUG_ON(smp_processor_id() != cpu);
+
+ dev = get_cpu_device(cpu);
+
+ /* Convert target_freq from kHz to Hz */
+ freq = clk_round_rate(cpuclk, target_freq * 1000);
+
+ if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
+ return -EINVAL;
+
+ dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000);
+
+ freqs.old = sh_cpufreq_get(cpu);
+ freqs.new = (freq + 500) / 1000;
+ freqs.flags = 0;
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+ clk_set_rate(cpuclk, freq);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ dev_dbg(dev, "set frequency %lu Hz\n", freq);
+
+ return 0;
+}
+
+static int sh_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
+ struct cpufreq_frequency_table *freq_table;
+
+ freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
+ if (freq_table)
+ return cpufreq_frequency_table_verify(policy, freq_table);
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
+ policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ return 0;
+}
+
+static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
+ struct cpufreq_frequency_table *freq_table;
+ struct device *dev;
+
+ dev = get_cpu_device(cpu);
+
+ cpuclk = clk_get(dev, "cpu_clk");
+ if (IS_ERR(cpuclk)) {
+ dev_err(dev, "couldn't get CPU clk\n");
+ return PTR_ERR(cpuclk);
+ }
+
+ policy->cur = sh_cpufreq_get(cpu);
+
+ freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
+ if (freq_table) {
+ int result;
+
+ result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
+ if (!result)
+ cpufreq_frequency_table_get_attr(freq_table, cpu);
+ } else {
+ dev_notice(dev, "no frequency table found, falling back "
+ "to rate rounding.\n");
+
+ policy->min = policy->cpuinfo.min_freq =
+ (clk_round_rate(cpuclk, 1) + 500) / 1000;
+ policy->max = policy->cpuinfo.max_freq =
+ (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
+ }
+
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+
+ dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
+ "Maximum %u.%03u MHz.\n",
+ policy->min / 1000, policy->min % 1000,
+ policy->max / 1000, policy->max % 1000);
+
+ return 0;
+}
+
+static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+ unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
+
+ cpufreq_frequency_table_put_attr(cpu);
+ clk_put(cpuclk);
+
+ return 0;
+}
+
+static struct freq_attr *sh_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver sh_cpufreq_driver = {
+ .owner = THIS_MODULE,
+ .name = "sh",
+ .get = sh_cpufreq_get,
+ .target = sh_cpufreq_target,
+ .verify = sh_cpufreq_verify,
+ .init = sh_cpufreq_cpu_init,
+ .exit = sh_cpufreq_cpu_exit,
+ .attr = sh_freq_attr,
+};
+
+static int __init sh_cpufreq_module_init(void)
+{
+ pr_notice("SuperH CPU frequency driver.\n");
+ return cpufreq_register_driver(&sh_cpufreq_driver);
+}
+
+static void __exit sh_cpufreq_module_exit(void)
+{
+ cpufreq_unregister_driver(&sh_cpufreq_driver);
+}
+
+module_init(sh_cpufreq_module_init);
+module_exit(sh_cpufreq_module_exit);
+
+MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
+MODULE_DESCRIPTION("cpufreq driver for SuperH");
+MODULE_LICENSE("GPL");
diff --git a/drivers/cpufreq/sparc-us2e-cpufreq.c b/drivers/cpufreq/sparc-us2e-cpufreq.c
new file mode 100644
index 000000000000..306ae462bba6
--- /dev/null
+++ b/drivers/cpufreq/sparc-us2e-cpufreq.c
@@ -0,0 +1,408 @@
+/* us2e_cpufreq.c: UltraSPARC-IIe cpu frequency support
+ *
+ * Copyright (C) 2003 David S. Miller (davem@redhat.com)
+ *
+ * Many thanks to Dominik Brodowski for fixing up the cpufreq
+ * infrastructure in order to make this driver easier to implement.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/cpufreq.h>
+#include <linux/threads.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#include <asm/asi.h>
+#include <asm/timer.h>
+
+static struct cpufreq_driver *cpufreq_us2e_driver;
+
+struct us2e_freq_percpu_info {
+ struct cpufreq_frequency_table table[6];
+};
+
+/* Indexed by cpu number. */
+static struct us2e_freq_percpu_info *us2e_freq_table;
+
+#define HBIRD_MEM_CNTL0_ADDR 0x1fe0000f010UL
+#define HBIRD_ESTAR_MODE_ADDR 0x1fe0000f080UL
+
+/* UltraSPARC-IIe has five dividers: 1, 2, 4, 6, and 8. These are controlled
+ * in the ESTAR mode control register.
+ */
+#define ESTAR_MODE_DIV_1 0x0000000000000000UL
+#define ESTAR_MODE_DIV_2 0x0000000000000001UL
+#define ESTAR_MODE_DIV_4 0x0000000000000003UL
+#define ESTAR_MODE_DIV_6 0x0000000000000002UL
+#define ESTAR_MODE_DIV_8 0x0000000000000004UL
+#define ESTAR_MODE_DIV_MASK 0x0000000000000007UL
+
+#define MCTRL0_SREFRESH_ENAB 0x0000000000010000UL
+#define MCTRL0_REFR_COUNT_MASK 0x0000000000007f00UL
+#define MCTRL0_REFR_COUNT_SHIFT 8
+#define MCTRL0_REFR_INTERVAL 7800
+#define MCTRL0_REFR_CLKS_P_CNT 64
+
+static unsigned long read_hbreg(unsigned long addr)
+{
+ unsigned long ret;
+
+ __asm__ __volatile__("ldxa [%1] %2, %0"
+ : "=&r" (ret)
+ : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
+ return ret;
+}
+
+static void write_hbreg(unsigned long addr, unsigned long val)
+{
+ __asm__ __volatile__("stxa %0, [%1] %2\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E)
+ : "memory");
+ if (addr == HBIRD_ESTAR_MODE_ADDR) {
+ /* Need to wait 16 clock cycles for the PLL to lock. */
+ udelay(1);
+ }
+}
+
+static void self_refresh_ctl(int enable)
+{
+ unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
+
+ if (enable)
+ mctrl |= MCTRL0_SREFRESH_ENAB;
+ else
+ mctrl &= ~MCTRL0_SREFRESH_ENAB;
+ write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
+ (void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
+}
+
+static void frob_mem_refresh(int cpu_slowing_down,
+ unsigned long clock_tick,
+ unsigned long old_divisor, unsigned long divisor)
+{
+ unsigned long old_refr_count, refr_count, mctrl;
+
+ refr_count = (clock_tick * MCTRL0_REFR_INTERVAL);
+ refr_count /= (MCTRL0_REFR_CLKS_P_CNT * divisor * 1000000000UL);
+
+ mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
+ old_refr_count = (mctrl & MCTRL0_REFR_COUNT_MASK)
+ >> MCTRL0_REFR_COUNT_SHIFT;
+
+ mctrl &= ~MCTRL0_REFR_COUNT_MASK;
+ mctrl |= refr_count << MCTRL0_REFR_COUNT_SHIFT;
+ write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
+ mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
+
+ if (cpu_slowing_down && !(mctrl & MCTRL0_SREFRESH_ENAB)) {
+ unsigned long usecs;
+
+ /* We have to wait for both refresh counts (old
+ * and new) to go to zero.
+ */
+ usecs = (MCTRL0_REFR_CLKS_P_CNT *
+ (refr_count + old_refr_count) *
+ 1000000UL *
+ old_divisor) / clock_tick;
+ udelay(usecs + 1UL);
+ }
+}
+
+static void us2e_transition(unsigned long estar, unsigned long new_bits,
+ unsigned long clock_tick,
+ unsigned long old_divisor, unsigned long divisor)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ estar &= ~ESTAR_MODE_DIV_MASK;
+
+ /* This is based upon the state transition diagram in the IIe manual. */
+ if (old_divisor == 2 && divisor == 1) {
+ self_refresh_ctl(0);
+ write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
+ frob_mem_refresh(0, clock_tick, old_divisor, divisor);
+ } else if (old_divisor == 1 && divisor == 2) {
+ frob_mem_refresh(1, clock_tick, old_divisor, divisor);
+ write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
+ self_refresh_ctl(1);
+ } else if (old_divisor == 1 && divisor > 2) {
+ us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
+ 1, 2);
+ us2e_transition(estar, new_bits, clock_tick,
+ 2, divisor);
+ } else if (old_divisor > 2 && divisor == 1) {
+ us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
+ old_divisor, 2);
+ us2e_transition(estar, new_bits, clock_tick,
+ 2, divisor);
+ } else if (old_divisor < divisor) {
+ frob_mem_refresh(0, clock_tick, old_divisor, divisor);
+ write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
+ } else if (old_divisor > divisor) {
+ write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
+ frob_mem_refresh(1, clock_tick, old_divisor, divisor);
+ } else {
+ BUG();
+ }
+
+ local_irq_restore(flags);
+}
+
+static unsigned long index_to_estar_mode(unsigned int index)
+{
+ switch (index) {
+ case 0:
+ return ESTAR_MODE_DIV_1;
+
+ case 1:
+ return ESTAR_MODE_DIV_2;
+
+ case 2:
+ return ESTAR_MODE_DIV_4;
+
+ case 3:
+ return ESTAR_MODE_DIV_6;
+
+ case 4:
+ return ESTAR_MODE_DIV_8;
+
+ default:
+ BUG();
+ }
+}
+
+static unsigned long index_to_divisor(unsigned int index)
+{
+ switch (index) {
+ case 0:
+ return 1;
+
+ case 1:
+ return 2;
+
+ case 2:
+ return 4;
+
+ case 3:
+ return 6;
+
+ case 4:
+ return 8;
+
+ default:
+ BUG();
+ }
+}
+
+static unsigned long estar_to_divisor(unsigned long estar)
+{
+ unsigned long ret;
+
+ switch (estar & ESTAR_MODE_DIV_MASK) {
+ case ESTAR_MODE_DIV_1:
+ ret = 1;
+ break;
+ case ESTAR_MODE_DIV_2:
+ ret = 2;
+ break;
+ case ESTAR_MODE_DIV_4:
+ ret = 4;
+ break;
+ case ESTAR_MODE_DIV_6:
+ ret = 6;
+ break;
+ case ESTAR_MODE_DIV_8:
+ ret = 8;
+ break;
+ default:
+ BUG();
+ }
+
+ return ret;
+}
+
+static unsigned int us2e_freq_get(unsigned int cpu)
+{
+ cpumask_t cpus_allowed;
+ unsigned long clock_tick, estar;
+
+ cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ clock_tick = sparc64_get_clock_tick(cpu) / 1000;
+ estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
+
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+
+ return clock_tick / estar_to_divisor(estar);
+}
+
+static void us2e_set_cpu_divider_index(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ unsigned int cpu = policy->cpu;
+ unsigned long new_bits, new_freq;
+ unsigned long clock_tick, divisor, old_divisor, estar;
+ cpumask_t cpus_allowed;
+ struct cpufreq_freqs freqs;
+
+ cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
+ new_bits = index_to_estar_mode(index);
+ divisor = index_to_divisor(index);
+ new_freq /= divisor;
+
+ estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
+
+ old_divisor = estar_to_divisor(estar);
+
+ freqs.old = clock_tick / old_divisor;
+ freqs.new = new_freq;
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ if (old_divisor != divisor)
+ us2e_transition(estar, new_bits, clock_tick * 1000,
+ old_divisor, divisor);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+}
+
+static int us2e_freq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int new_index = 0;
+
+ if (cpufreq_frequency_table_target(policy,
+ &us2e_freq_table[policy->cpu].table[0],
+ target_freq, relation, &new_index))
+ return -EINVAL;
+
+ us2e_set_cpu_divider_index(policy, new_index);
+
+ return 0;
+}
+
+static int us2e_freq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy,
+ &us2e_freq_table[policy->cpu].table[0]);
+}
+
+static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
+{
+ unsigned int cpu = policy->cpu;
+ unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
+ struct cpufreq_frequency_table *table =
+ &us2e_freq_table[cpu].table[0];
+
+ table[0].index = 0;
+ table[0].frequency = clock_tick / 1;
+ table[1].index = 1;
+ table[1].frequency = clock_tick / 2;
+ table[2].index = 2;
+ table[2].frequency = clock_tick / 4;
+ table[2].index = 3;
+ table[2].frequency = clock_tick / 6;
+ table[2].index = 4;
+ table[2].frequency = clock_tick / 8;
+ table[2].index = 5;
+ table[3].frequency = CPUFREQ_TABLE_END;
+
+ policy->cpuinfo.transition_latency = 0;
+ policy->cur = clock_tick;
+
+ return cpufreq_frequency_table_cpuinfo(policy, table);
+}
+
+static int us2e_freq_cpu_exit(struct cpufreq_policy *policy)
+{
+ if (cpufreq_us2e_driver)
+ us2e_set_cpu_divider_index(policy, 0);
+
+ return 0;
+}
+
+static int __init us2e_freq_init(void)
+{
+ unsigned long manuf, impl, ver;
+ int ret;
+
+ if (tlb_type != spitfire)
+ return -ENODEV;
+
+ __asm__("rdpr %%ver, %0" : "=r" (ver));
+ manuf = ((ver >> 48) & 0xffff);
+ impl = ((ver >> 32) & 0xffff);
+
+ if (manuf == 0x17 && impl == 0x13) {
+ struct cpufreq_driver *driver;
+
+ ret = -ENOMEM;
+ driver = kzalloc(sizeof(struct cpufreq_driver), GFP_KERNEL);
+ if (!driver)
+ goto err_out;
+
+ us2e_freq_table = kzalloc(
+ (NR_CPUS * sizeof(struct us2e_freq_percpu_info)),
+ GFP_KERNEL);
+ if (!us2e_freq_table)
+ goto err_out;
+
+ driver->init = us2e_freq_cpu_init;
+ driver->verify = us2e_freq_verify;
+ driver->target = us2e_freq_target;
+ driver->get = us2e_freq_get;
+ driver->exit = us2e_freq_cpu_exit;
+ driver->owner = THIS_MODULE,
+ strcpy(driver->name, "UltraSPARC-IIe");
+
+ cpufreq_us2e_driver = driver;
+ ret = cpufreq_register_driver(driver);
+ if (ret)
+ goto err_out;
+
+ return 0;
+
+err_out:
+ if (driver) {
+ kfree(driver);
+ cpufreq_us2e_driver = NULL;
+ }
+ kfree(us2e_freq_table);
+ us2e_freq_table = NULL;
+ return ret;
+ }
+
+ return -ENODEV;
+}
+
+static void __exit us2e_freq_exit(void)
+{
+ if (cpufreq_us2e_driver) {
+ cpufreq_unregister_driver(cpufreq_us2e_driver);
+ kfree(cpufreq_us2e_driver);
+ cpufreq_us2e_driver = NULL;
+ kfree(us2e_freq_table);
+ us2e_freq_table = NULL;
+ }
+}
+
+MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
+MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-IIe");
+MODULE_LICENSE("GPL");
+
+module_init(us2e_freq_init);
+module_exit(us2e_freq_exit);
diff --git a/drivers/cpufreq/sparc-us3-cpufreq.c b/drivers/cpufreq/sparc-us3-cpufreq.c
new file mode 100644
index 000000000000..c71ee142347a
--- /dev/null
+++ b/drivers/cpufreq/sparc-us3-cpufreq.c
@@ -0,0 +1,269 @@
+/* us3_cpufreq.c: UltraSPARC-III cpu frequency support
+ *
+ * Copyright (C) 2003 David S. Miller (davem@redhat.com)
+ *
+ * Many thanks to Dominik Brodowski for fixing up the cpufreq
+ * infrastructure in order to make this driver easier to implement.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/cpufreq.h>
+#include <linux/threads.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+
+#include <asm/head.h>
+#include <asm/timer.h>
+
+static struct cpufreq_driver *cpufreq_us3_driver;
+
+struct us3_freq_percpu_info {
+ struct cpufreq_frequency_table table[4];
+};
+
+/* Indexed by cpu number. */
+static struct us3_freq_percpu_info *us3_freq_table;
+
+/* UltraSPARC-III has three dividers: 1, 2, and 32. These are controlled
+ * in the Safari config register.
+ */
+#define SAFARI_CFG_DIV_1 0x0000000000000000UL
+#define SAFARI_CFG_DIV_2 0x0000000040000000UL
+#define SAFARI_CFG_DIV_32 0x0000000080000000UL
+#define SAFARI_CFG_DIV_MASK 0x00000000C0000000UL
+
+static unsigned long read_safari_cfg(void)
+{
+ unsigned long ret;
+
+ __asm__ __volatile__("ldxa [%%g0] %1, %0"
+ : "=&r" (ret)
+ : "i" (ASI_SAFARI_CONFIG));
+ return ret;
+}
+
+static void write_safari_cfg(unsigned long val)
+{
+ __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (val), "i" (ASI_SAFARI_CONFIG)
+ : "memory");
+}
+
+static unsigned long get_current_freq(unsigned int cpu, unsigned long safari_cfg)
+{
+ unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
+ unsigned long ret;
+
+ switch (safari_cfg & SAFARI_CFG_DIV_MASK) {
+ case SAFARI_CFG_DIV_1:
+ ret = clock_tick / 1;
+ break;
+ case SAFARI_CFG_DIV_2:
+ ret = clock_tick / 2;
+ break;
+ case SAFARI_CFG_DIV_32:
+ ret = clock_tick / 32;
+ break;
+ default:
+ BUG();
+ }
+
+ return ret;
+}
+
+static unsigned int us3_freq_get(unsigned int cpu)
+{
+ cpumask_t cpus_allowed;
+ unsigned long reg;
+ unsigned int ret;
+
+ cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ reg = read_safari_cfg();
+ ret = get_current_freq(cpu, reg);
+
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+
+ return ret;
+}
+
+static void us3_set_cpu_divider_index(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ unsigned int cpu = policy->cpu;
+ unsigned long new_bits, new_freq, reg;
+ cpumask_t cpus_allowed;
+ struct cpufreq_freqs freqs;
+
+ cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+
+ new_freq = sparc64_get_clock_tick(cpu) / 1000;
+ switch (index) {
+ case 0:
+ new_bits = SAFARI_CFG_DIV_1;
+ new_freq /= 1;
+ break;
+ case 1:
+ new_bits = SAFARI_CFG_DIV_2;
+ new_freq /= 2;
+ break;
+ case 2:
+ new_bits = SAFARI_CFG_DIV_32;
+ new_freq /= 32;
+ break;
+
+ default:
+ BUG();
+ }
+
+ reg = read_safari_cfg();
+
+ freqs.old = get_current_freq(cpu, reg);
+ freqs.new = new_freq;
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ reg &= ~SAFARI_CFG_DIV_MASK;
+ reg |= new_bits;
+ write_safari_cfg(reg);
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ set_cpus_allowed_ptr(current, &cpus_allowed);
+}
+
+static int us3_freq_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int new_index = 0;
+
+ if (cpufreq_frequency_table_target(policy,
+ &us3_freq_table[policy->cpu].table[0],
+ target_freq,
+ relation,
+ &new_index))
+ return -EINVAL;
+
+ us3_set_cpu_divider_index(policy, new_index);
+
+ return 0;
+}
+
+static int us3_freq_verify(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy,
+ &us3_freq_table[policy->cpu].table[0]);
+}
+
+static int __init us3_freq_cpu_init(struct cpufreq_policy *policy)
+{
+ unsigned int cpu = policy->cpu;
+ unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
+ struct cpufreq_frequency_table *table =
+ &us3_freq_table[cpu].table[0];
+
+ table[0].index = 0;
+ table[0].frequency = clock_tick / 1;
+ table[1].index = 1;
+ table[1].frequency = clock_tick / 2;
+ table[2].index = 2;
+ table[2].frequency = clock_tick / 32;
+ table[3].index = 0;
+ table[3].frequency = CPUFREQ_TABLE_END;
+
+ policy->cpuinfo.transition_latency = 0;
+ policy->cur = clock_tick;
+
+ return cpufreq_frequency_table_cpuinfo(policy, table);
+}
+
+static int us3_freq_cpu_exit(struct cpufreq_policy *policy)
+{
+ if (cpufreq_us3_driver)
+ us3_set_cpu_divider_index(policy, 0);
+
+ return 0;
+}
+
+static int __init us3_freq_init(void)
+{
+ unsigned long manuf, impl, ver;
+ int ret;
+
+ if (tlb_type != cheetah && tlb_type != cheetah_plus)
+ return -ENODEV;
+
+ __asm__("rdpr %%ver, %0" : "=r" (ver));
+ manuf = ((ver >> 48) & 0xffff);
+ impl = ((ver >> 32) & 0xffff);
+
+ if (manuf == CHEETAH_MANUF &&
+ (impl == CHEETAH_IMPL ||
+ impl == CHEETAH_PLUS_IMPL ||
+ impl == JAGUAR_IMPL ||
+ impl == PANTHER_IMPL)) {
+ struct cpufreq_driver *driver;
+
+ ret = -ENOMEM;
+ driver = kzalloc(sizeof(struct cpufreq_driver), GFP_KERNEL);
+ if (!driver)
+ goto err_out;
+
+ us3_freq_table = kzalloc(
+ (NR_CPUS * sizeof(struct us3_freq_percpu_info)),
+ GFP_KERNEL);
+ if (!us3_freq_table)
+ goto err_out;
+
+ driver->init = us3_freq_cpu_init;
+ driver->verify = us3_freq_verify;
+ driver->target = us3_freq_target;
+ driver->get = us3_freq_get;
+ driver->exit = us3_freq_cpu_exit;
+ driver->owner = THIS_MODULE,
+ strcpy(driver->name, "UltraSPARC-III");
+
+ cpufreq_us3_driver = driver;
+ ret = cpufreq_register_driver(driver);
+ if (ret)
+ goto err_out;
+
+ return 0;
+
+err_out:
+ if (driver) {
+ kfree(driver);
+ cpufreq_us3_driver = NULL;
+ }
+ kfree(us3_freq_table);
+ us3_freq_table = NULL;
+ return ret;
+ }
+
+ return -ENODEV;
+}
+
+static void __exit us3_freq_exit(void)
+{
+ if (cpufreq_us3_driver) {
+ cpufreq_unregister_driver(cpufreq_us3_driver);
+ kfree(cpufreq_us3_driver);
+ cpufreq_us3_driver = NULL;
+ kfree(us3_freq_table);
+ us3_freq_table = NULL;
+ }
+}
+
+MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
+MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-III");
+MODULE_LICENSE("GPL");
+
+module_init(us3_freq_init);
+module_exit(us3_freq_exit);
diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c
index 7e4d77327957..156829f4576d 100644
--- a/drivers/cpufreq/spear-cpufreq.c
+++ b/drivers/cpufreq/spear-cpufreq.c
@@ -121,7 +121,6 @@ static int spear_cpufreq_target(struct cpufreq_policy *policy,
target_freq, relation, &index))
return -EINVAL;
- freqs.cpu = policy->cpu;
freqs.old = spear_cpufreq_get(0);
newfreq = spear_cpufreq.freq_tbl[index].frequency * 1000;
@@ -158,8 +157,7 @@ static int spear_cpufreq_target(struct cpufreq_policy *policy,
freqs.new = newfreq / 1000;
freqs.new /= mult;
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
if (mult == 2)
ret = spear1340_set_cpu_rate(srcclk, newfreq);
@@ -172,8 +170,7 @@ static int spear_cpufreq_target(struct cpufreq_policy *policy,
freqs.new = clk_get_rate(spear_cpufreq.clk) / 1000;
}
- for_each_cpu(freqs.cpu, policy->cpus)
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return ret;
}
diff --git a/drivers/cpufreq/speedstep-centrino.c b/drivers/cpufreq/speedstep-centrino.c
index 3a953d519f46..618e6f417b1c 100644
--- a/drivers/cpufreq/speedstep-centrino.c
+++ b/drivers/cpufreq/speedstep-centrino.c
@@ -457,7 +457,7 @@ static int centrino_target (struct cpufreq_policy *policy,
unsigned int msr, oldmsr = 0, h = 0, cpu = policy->cpu;
struct cpufreq_freqs freqs;
int retval = 0;
- unsigned int j, k, first_cpu, tmp;
+ unsigned int j, first_cpu, tmp;
cpumask_var_t covered_cpus;
if (unlikely(!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL)))
@@ -481,10 +481,6 @@ static int centrino_target (struct cpufreq_policy *policy,
for_each_cpu(j, policy->cpus) {
int good_cpu;
- /* cpufreq holds the hotplug lock, so we are safe here */
- if (!cpu_online(j))
- continue;
-
/*
* Support for SMP systems.
* Make sure we are running on CPU that wants to change freq
@@ -522,13 +518,8 @@ static int centrino_target (struct cpufreq_policy *policy,
pr_debug("target=%dkHz old=%d new=%d msr=%04x\n",
target_freq, freqs.old, freqs.new, msr);
- for_each_cpu(k, policy->cpus) {
- if (!cpu_online(k))
- continue;
- freqs.cpu = k;
- cpufreq_notify_transition(&freqs,
+ cpufreq_notify_transition(policy, &freqs,
CPUFREQ_PRECHANGE);
- }
first_cpu = 0;
/* all but 16 LSB are reserved, treat them with care */
@@ -544,12 +535,7 @@ static int centrino_target (struct cpufreq_policy *policy,
cpumask_set_cpu(j, covered_cpus);
}
- for_each_cpu(k, policy->cpus) {
- if (!cpu_online(k))
- continue;
- freqs.cpu = k;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
if (unlikely(retval)) {
/*
@@ -565,12 +551,8 @@ static int centrino_target (struct cpufreq_policy *policy,
tmp = freqs.new;
freqs.new = freqs.old;
freqs.old = tmp;
- for_each_cpu(j, policy->cpus) {
- if (!cpu_online(j))
- continue;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
}
retval = 0;
diff --git a/drivers/cpufreq/speedstep-ich.c b/drivers/cpufreq/speedstep-ich.c
index e29b59aa68a8..e2e5aa971452 100644
--- a/drivers/cpufreq/speedstep-ich.c
+++ b/drivers/cpufreq/speedstep-ich.c
@@ -263,7 +263,6 @@ static int speedstep_target(struct cpufreq_policy *policy,
{
unsigned int newstate = 0, policy_cpu;
struct cpufreq_freqs freqs;
- int i;
if (cpufreq_frequency_table_target(policy, &speedstep_freqs[0],
target_freq, relation, &newstate))
@@ -272,7 +271,6 @@ static int speedstep_target(struct cpufreq_policy *policy,
policy_cpu = cpumask_any_and(policy->cpus, cpu_online_mask);
freqs.old = speedstep_get(policy_cpu);
freqs.new = speedstep_freqs[newstate].frequency;
- freqs.cpu = policy->cpu;
pr_debug("transiting from %u to %u kHz\n", freqs.old, freqs.new);
@@ -280,18 +278,12 @@ static int speedstep_target(struct cpufreq_policy *policy,
if (freqs.old == freqs.new)
return 0;
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
smp_call_function_single(policy_cpu, _speedstep_set_state, &newstate,
true);
- for_each_cpu(i, policy->cpus) {
- freqs.cpu = i;
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- }
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
diff --git a/drivers/cpufreq/speedstep-smi.c b/drivers/cpufreq/speedstep-smi.c
index 6a457fcaaad5..f5a6b70ee6c0 100644
--- a/drivers/cpufreq/speedstep-smi.c
+++ b/drivers/cpufreq/speedstep-smi.c
@@ -252,14 +252,13 @@ static int speedstep_target(struct cpufreq_policy *policy,
freqs.old = speedstep_freqs[speedstep_get_state()].frequency;
freqs.new = speedstep_freqs[newstate].frequency;
- freqs.cpu = 0; /* speedstep.c is UP only driver */
if (freqs.old == freqs.new)
return 0;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
speedstep_set_state(newstate);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return 0;
}
diff --git a/drivers/cpufreq/tegra-cpufreq.c b/drivers/cpufreq/tegra-cpufreq.c
new file mode 100644
index 000000000000..c74c0e130ef4
--- /dev/null
+++ b/drivers/cpufreq/tegra-cpufreq.c
@@ -0,0 +1,292 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ * Colin Cross <ccross@google.com>
+ * Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/suspend.h>
+
+/* Frequency table index must be sequential starting at 0 */
+static struct cpufreq_frequency_table freq_table[] = {
+ { 0, 216000 },
+ { 1, 312000 },
+ { 2, 456000 },
+ { 3, 608000 },
+ { 4, 760000 },
+ { 5, 816000 },
+ { 6, 912000 },
+ { 7, 1000000 },
+ { 8, CPUFREQ_TABLE_END },
+};
+
+#define NUM_CPUS 2
+
+static struct clk *cpu_clk;
+static struct clk *pll_x_clk;
+static struct clk *pll_p_clk;
+static struct clk *emc_clk;
+
+static unsigned long target_cpu_speed[NUM_CPUS];
+static DEFINE_MUTEX(tegra_cpu_lock);
+static bool is_suspended;
+
+static int tegra_verify_speed(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, freq_table);
+}
+
+static unsigned int tegra_getspeed(unsigned int cpu)
+{
+ unsigned long rate;
+
+ if (cpu >= NUM_CPUS)
+ return 0;
+
+ rate = clk_get_rate(cpu_clk) / 1000;
+ return rate;
+}
+
+static int tegra_cpu_clk_set_rate(unsigned long rate)
+{
+ int ret;
+
+ /*
+ * Take an extra reference to the main pll so it doesn't turn
+ * off when we move the cpu off of it
+ */
+ clk_prepare_enable(pll_x_clk);
+
+ ret = clk_set_parent(cpu_clk, pll_p_clk);
+ if (ret) {
+ pr_err("Failed to switch cpu to clock pll_p\n");
+ goto out;
+ }
+
+ if (rate == clk_get_rate(pll_p_clk))
+ goto out;
+
+ ret = clk_set_rate(pll_x_clk, rate);
+ if (ret) {
+ pr_err("Failed to change pll_x to %lu\n", rate);
+ goto out;
+ }
+
+ ret = clk_set_parent(cpu_clk, pll_x_clk);
+ if (ret) {
+ pr_err("Failed to switch cpu to clock pll_x\n");
+ goto out;
+ }
+
+out:
+ clk_disable_unprepare(pll_x_clk);
+ return ret;
+}
+
+static int tegra_update_cpu_speed(struct cpufreq_policy *policy,
+ unsigned long rate)
+{
+ int ret = 0;
+ struct cpufreq_freqs freqs;
+
+ freqs.old = tegra_getspeed(0);
+ freqs.new = rate;
+
+ if (freqs.old == freqs.new)
+ return ret;
+
+ /*
+ * Vote on memory bus frequency based on cpu frequency
+ * This sets the minimum frequency, display or avp may request higher
+ */
+ if (rate >= 816000)
+ clk_set_rate(emc_clk, 600000000); /* cpu 816 MHz, emc max */
+ else if (rate >= 456000)
+ clk_set_rate(emc_clk, 300000000); /* cpu 456 MHz, emc 150Mhz */
+ else
+ clk_set_rate(emc_clk, 100000000); /* emc 50Mhz */
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+#ifdef CONFIG_CPU_FREQ_DEBUG
+ printk(KERN_DEBUG "cpufreq-tegra: transition: %u --> %u\n",
+ freqs.old, freqs.new);
+#endif
+
+ ret = tegra_cpu_clk_set_rate(freqs.new * 1000);
+ if (ret) {
+ pr_err("cpu-tegra: Failed to set cpu frequency to %d kHz\n",
+ freqs.new);
+ return ret;
+ }
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static unsigned long tegra_cpu_highest_speed(void)
+{
+ unsigned long rate = 0;
+ int i;
+
+ for_each_online_cpu(i)
+ rate = max(rate, target_cpu_speed[i]);
+ return rate;
+}
+
+static int tegra_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int idx;
+ unsigned int freq;
+ int ret = 0;
+
+ mutex_lock(&tegra_cpu_lock);
+
+ if (is_suspended) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ cpufreq_frequency_table_target(policy, freq_table, target_freq,
+ relation, &idx);
+
+ freq = freq_table[idx].frequency;
+
+ target_cpu_speed[policy->cpu] = freq;
+
+ ret = tegra_update_cpu_speed(policy, tegra_cpu_highest_speed());
+
+out:
+ mutex_unlock(&tegra_cpu_lock);
+ return ret;
+}
+
+static int tegra_pm_notify(struct notifier_block *nb, unsigned long event,
+ void *dummy)
+{
+ mutex_lock(&tegra_cpu_lock);
+ if (event == PM_SUSPEND_PREPARE) {
+ struct cpufreq_policy *policy = cpufreq_cpu_get(0);
+ is_suspended = true;
+ pr_info("Tegra cpufreq suspend: setting frequency to %d kHz\n",
+ freq_table[0].frequency);
+ tegra_update_cpu_speed(policy, freq_table[0].frequency);
+ cpufreq_cpu_put(policy);
+ } else if (event == PM_POST_SUSPEND) {
+ is_suspended = false;
+ }
+ mutex_unlock(&tegra_cpu_lock);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block tegra_cpu_pm_notifier = {
+ .notifier_call = tegra_pm_notify,
+};
+
+static int tegra_cpu_init(struct cpufreq_policy *policy)
+{
+ if (policy->cpu >= NUM_CPUS)
+ return -EINVAL;
+
+ clk_prepare_enable(emc_clk);
+ clk_prepare_enable(cpu_clk);
+
+ cpufreq_frequency_table_cpuinfo(policy, freq_table);
+ cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
+ policy->cur = tegra_getspeed(policy->cpu);
+ target_cpu_speed[policy->cpu] = policy->cur;
+
+ /* FIXME: what's the actual transition time? */
+ policy->cpuinfo.transition_latency = 300 * 1000;
+
+ cpumask_copy(policy->cpus, cpu_possible_mask);
+
+ if (policy->cpu == 0)
+ register_pm_notifier(&tegra_cpu_pm_notifier);
+
+ return 0;
+}
+
+static int tegra_cpu_exit(struct cpufreq_policy *policy)
+{
+ cpufreq_frequency_table_cpuinfo(policy, freq_table);
+ clk_disable_unprepare(emc_clk);
+ return 0;
+}
+
+static struct freq_attr *tegra_cpufreq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
+static struct cpufreq_driver tegra_cpufreq_driver = {
+ .verify = tegra_verify_speed,
+ .target = tegra_target,
+ .get = tegra_getspeed,
+ .init = tegra_cpu_init,
+ .exit = tegra_cpu_exit,
+ .name = "tegra",
+ .attr = tegra_cpufreq_attr,
+};
+
+static int __init tegra_cpufreq_init(void)
+{
+ cpu_clk = clk_get_sys(NULL, "cpu");
+ if (IS_ERR(cpu_clk))
+ return PTR_ERR(cpu_clk);
+
+ pll_x_clk = clk_get_sys(NULL, "pll_x");
+ if (IS_ERR(pll_x_clk))
+ return PTR_ERR(pll_x_clk);
+
+ pll_p_clk = clk_get_sys(NULL, "pll_p_cclk");
+ if (IS_ERR(pll_p_clk))
+ return PTR_ERR(pll_p_clk);
+
+ emc_clk = clk_get_sys("cpu", "emc");
+ if (IS_ERR(emc_clk)) {
+ clk_put(cpu_clk);
+ return PTR_ERR(emc_clk);
+ }
+
+ return cpufreq_register_driver(&tegra_cpufreq_driver);
+}
+
+static void __exit tegra_cpufreq_exit(void)
+{
+ cpufreq_unregister_driver(&tegra_cpufreq_driver);
+ clk_put(emc_clk);
+ clk_put(cpu_clk);
+}
+
+
+MODULE_AUTHOR("Colin Cross <ccross@android.com>");
+MODULE_DESCRIPTION("cpufreq driver for Nvidia Tegra2");
+MODULE_LICENSE("GPL");
+module_init(tegra_cpufreq_init);
+module_exit(tegra_cpufreq_exit);
diff --git a/drivers/cpufreq/unicore2-cpufreq.c b/drivers/cpufreq/unicore2-cpufreq.c
new file mode 100644
index 000000000000..12fc904d7dab
--- /dev/null
+++ b/drivers/cpufreq/unicore2-cpufreq.c
@@ -0,0 +1,92 @@
+/*
+ * clock scaling for the UniCore-II
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ * Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+
+#include <mach/hardware.h>
+
+static struct cpufreq_driver ucv2_driver;
+
+/* make sure that only the "userspace" governor is run
+ * -- anything else wouldn't make sense on this platform, anyway.
+ */
+int ucv2_verify_speed(struct cpufreq_policy *policy)
+{
+ if (policy->cpu)
+ return -EINVAL;
+
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
+
+ return 0;
+}
+
+static unsigned int ucv2_getspeed(unsigned int cpu)
+{
+ struct clk *mclk = clk_get(NULL, "MAIN_CLK");
+
+ if (cpu)
+ return 0;
+ return clk_get_rate(mclk)/1000;
+}
+
+static int ucv2_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int cur = ucv2_getspeed(0);
+ struct cpufreq_freqs freqs;
+ struct clk *mclk = clk_get(NULL, "MAIN_CLK");
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+ if (!clk_set_rate(mclk, target_freq * 1000)) {
+ freqs.old = cur;
+ freqs.new = target_freq;
+ }
+
+ cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+static int __init ucv2_cpu_init(struct cpufreq_policy *policy)
+{
+ if (policy->cpu != 0)
+ return -EINVAL;
+ policy->cur = ucv2_getspeed(0);
+ policy->min = policy->cpuinfo.min_freq = 250000;
+ policy->max = policy->cpuinfo.max_freq = 1000000;
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ return 0;
+}
+
+static struct cpufreq_driver ucv2_driver = {
+ .flags = CPUFREQ_STICKY,
+ .verify = ucv2_verify_speed,
+ .target = ucv2_target,
+ .get = ucv2_getspeed,
+ .init = ucv2_cpu_init,
+ .name = "UniCore-II",
+};
+
+static int __init ucv2_cpufreq_init(void)
+{
+ return cpufreq_register_driver(&ucv2_driver);
+}
+
+arch_initcall(ucv2_cpufreq_init);