diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/950-0046-Add-cpufreq-driver.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/950-0046-Add-cpufreq-driver.patch | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/target/linux/brcm2708/patches-4.9/950-0046-Add-cpufreq-driver.patch b/target/linux/brcm2708/patches-4.9/950-0046-Add-cpufreq-driver.patch deleted file mode 100644 index 7c5691c120..0000000000 --- a/target/linux/brcm2708/patches-4.9/950-0046-Add-cpufreq-driver.patch +++ /dev/null @@ -1,262 +0,0 @@ -From 7d4719c360b755637c2e68f9855be282cd0065b6 Mon Sep 17 00:00:00 2001 -From: popcornmix <popcornmix@gmail.com> -Date: Wed, 3 Jul 2013 00:49:20 +0100 -Subject: [PATCH] Add cpufreq driver - -Signed-off-by: popcornmix <popcornmix@gmail.com> ---- - drivers/cpufreq/Kconfig.arm | 9 ++ - drivers/cpufreq/Makefile | 1 + - drivers/cpufreq/bcm2835-cpufreq.c | 218 ++++++++++++++++++++++++++++++++++++++ - 3 files changed, 228 insertions(+) - create mode 100644 drivers/cpufreq/bcm2835-cpufreq.c - ---- a/drivers/cpufreq/Kconfig.arm -+++ b/drivers/cpufreq/Kconfig.arm -@@ -220,6 +220,15 @@ config ARM_STI_CPUFREQ - this config option if you wish to add CPUFreq support for STi based - SoCs. - -+config ARM_BCM2835_CPUFREQ -+ depends on RASPBERRYPI_FIRMWARE -+ bool "BCM2835 Driver" -+ default y -+ help -+ This adds the CPUFreq driver for BCM2835 -+ -+ If in doubt, say N. -+ - config ARM_TEGRA20_CPUFREQ - bool "Tegra20 CPUFreq support" - depends on ARCH_TEGRA ---- a/drivers/cpufreq/Makefile -+++ b/drivers/cpufreq/Makefile -@@ -75,6 +75,7 @@ obj-$(CONFIG_ARM_SA1110_CPUFREQ) += sa11 - obj-$(CONFIG_ARM_SCPI_CPUFREQ) += scpi-cpufreq.o - obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o - obj-$(CONFIG_ARM_STI_CPUFREQ) += sti-cpufreq.o -+obj-$(CONFIG_ARM_BCM2835_CPUFREQ) += bcm2835-cpufreq.o - obj-$(CONFIG_ARM_TEGRA20_CPUFREQ) += tegra20-cpufreq.o - obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o - obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o ---- /dev/null -+++ b/drivers/cpufreq/bcm2835-cpufreq.c -@@ -0,0 +1,218 @@ -+/***************************************************************************** -+* Copyright 2011 Broadcom Corporation. All rights reserved. -+* -+* Unless you and Broadcom execute a separate written software license -+* agreement governing use of this software, this software is licensed to you -+* under the terms of the GNU General Public License version 2, available at -+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL"). -+* -+* Notwithstanding the above, under no circumstances may you combine this -+* software in any way with any other Broadcom software provided under a -+* license other than the GPL, without Broadcom's express prior written -+* consent. -+*****************************************************************************/ -+ -+/***************************************************************************** -+* FILENAME: bcm2835-cpufreq.h -+* DESCRIPTION: This driver dynamically manages the CPU Frequency of the ARM -+* processor. Messages are sent to Videocore either setting or requesting the -+* frequency of the ARM in order to match an appropiate frequency to the current -+* usage of the processor. The policy which selects the frequency to use is -+* defined in the kernel .config file, but can be changed during runtime. -+*****************************************************************************/ -+ -+/* ---------- INCLUDES ---------- */ -+#include <linux/kernel.h> -+#include <linux/init.h> -+#include <linux/module.h> -+#include <linux/cpufreq.h> -+#include <soc/bcm2835/raspberrypi-firmware.h> -+ -+/* ---------- DEFINES ---------- */ -+/*#define CPUFREQ_DEBUG_ENABLE*/ /* enable debugging */ -+#define MODULE_NAME "bcm2835-cpufreq" -+ -+#define VCMSG_ID_ARM_CLOCK 0x000000003 /* Clock/Voltage ID's */ -+ -+/* debug printk macros */ -+#ifdef CPUFREQ_DEBUG_ENABLE -+#define print_debug(fmt,...) pr_debug("%s:%s:%d: "fmt, MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__) -+#else -+#define print_debug(fmt,...) -+#endif -+#define print_err(fmt,...) pr_err("%s:%s:%d: "fmt, MODULE_NAME, __func__,__LINE__, ##__VA_ARGS__) -+#define print_info(fmt,...) pr_info("%s: "fmt, MODULE_NAME, ##__VA_ARGS__) -+ -+/* ---------- GLOBALS ---------- */ -+static struct cpufreq_driver bcm2835_cpufreq_driver; /* the cpufreq driver global */ -+static unsigned int min_frequency, max_frequency; -+static struct cpufreq_frequency_table bcm2835_freq_table[3]; -+ -+/* -+ =============================================== -+ clk_rate either gets or sets the clock rates. -+ =============================================== -+*/ -+ -+static int bcm2835_cpufreq_clock_property(u32 tag, u32 id, u32 *val) -+{ -+ struct rpi_firmware *fw = rpi_firmware_get(NULL); -+ struct { -+ u32 id; -+ u32 val; -+ } packet; -+ int ret; -+ -+ packet.id = id; -+ packet.val = *val; -+ ret = rpi_firmware_property(fw, tag, &packet, sizeof(packet)); -+ if (ret) -+ return ret; -+ -+ *val = packet.val; -+ -+ return 0; -+} -+ -+static uint32_t bcm2835_cpufreq_set_clock(int cur_rate, int arm_rate) -+{ -+ u32 rate = arm_rate * 1000; -+ int ret; -+ -+ ret = bcm2835_cpufreq_clock_property(RPI_FIRMWARE_SET_CLOCK_RATE, VCMSG_ID_ARM_CLOCK, &rate); -+ if (ret) { -+ print_err("Failed to set clock: %d (%d)\n", arm_rate, ret); -+ return 0; -+ } -+ -+ rate /= 1000; -+ print_debug("Setting new frequency = %d -> %d (actual %d)\n", cur_rate, arm_rate, rate); -+ -+ return rate; -+} -+ -+static uint32_t bcm2835_cpufreq_get_clock(int tag) -+{ -+ u32 rate; -+ int ret; -+ -+ ret = bcm2835_cpufreq_clock_property(tag, VCMSG_ID_ARM_CLOCK, &rate); -+ if (ret) { -+ print_err("Failed to get clock (%d)\n", ret); -+ return 0; -+ } -+ -+ rate /= 1000; -+ print_debug("%s frequency = %u\n", -+ tag == RPI_FIRMWARE_GET_CLOCK_RATE ? "Current": -+ tag == RPI_FIRMWARE_GET_MIN_CLOCK_RATE ? "Min": -+ tag == RPI_FIRMWARE_GET_MAX_CLOCK_RATE ? "Max": -+ "Unexpected", rate); -+ -+ return rate; -+} -+ -+/* -+ ==================================================== -+ Module Initialisation registers the cpufreq driver -+ ==================================================== -+*/ -+static int __init bcm2835_cpufreq_module_init(void) -+{ -+ print_debug("IN\n"); -+ return cpufreq_register_driver(&bcm2835_cpufreq_driver); -+} -+ -+/* -+ ============= -+ Module exit -+ ============= -+*/ -+static void __exit bcm2835_cpufreq_module_exit(void) -+{ -+ print_debug("IN\n"); -+ cpufreq_unregister_driver(&bcm2835_cpufreq_driver); -+ return; -+} -+ -+/* -+ ============================================================== -+ Initialisation function sets up the CPU policy for first use -+ ============================================================== -+*/ -+static int bcm2835_cpufreq_driver_init(struct cpufreq_policy *policy) -+{ -+ /* measured value of how long it takes to change frequency */ -+ const unsigned int transition_latency = 355000; /* ns */ -+ -+ if (!rpi_firmware_get(NULL)) { -+ print_err("Firmware is not available\n"); -+ return -ENODEV; -+ } -+ -+ /* now find out what the maximum and minimum frequencies are */ -+ min_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MIN_CLOCK_RATE); -+ max_frequency = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_MAX_CLOCK_RATE); -+ -+ if (min_frequency == max_frequency) { -+ bcm2835_freq_table[0].frequency = min_frequency; -+ bcm2835_freq_table[1].frequency = CPUFREQ_TABLE_END; -+ } else { -+ bcm2835_freq_table[0].frequency = min_frequency; -+ bcm2835_freq_table[1].frequency = max_frequency; -+ bcm2835_freq_table[2].frequency = CPUFREQ_TABLE_END; -+ } -+ -+ print_info("min=%d max=%d\n", min_frequency, max_frequency); -+ return cpufreq_generic_init(policy, bcm2835_freq_table, transition_latency); -+} -+ -+/* -+ ===================================================================== -+ Target index function chooses the requested frequency from the table -+ ===================================================================== -+*/ -+ -+static int bcm2835_cpufreq_driver_target_index(struct cpufreq_policy *policy, unsigned int state) -+{ -+ unsigned int target_freq = state == 0 ? min_frequency : max_frequency; -+ unsigned int cur = bcm2835_cpufreq_set_clock(policy->cur, target_freq); -+ -+ if (!cur) -+ { -+ print_err("Error occurred setting a new frequency (%d)\n", target_freq); -+ return -EINVAL; -+ } -+ print_debug("%s: %i: freq %d->%d\n", policy->governor->name, state, policy->cur, cur); -+ return 0; -+} -+ -+/* -+ ====================================================== -+ Get function returns the current frequency from table -+ ====================================================== -+*/ -+ -+static unsigned int bcm2835_cpufreq_driver_get(unsigned int cpu) -+{ -+ unsigned int actual_rate = bcm2835_cpufreq_get_clock(RPI_FIRMWARE_GET_CLOCK_RATE); -+ print_debug("cpu%d: freq=%d\n", cpu, actual_rate); -+ return actual_rate <= min_frequency ? min_frequency : max_frequency; -+} -+ -+/* the CPUFreq driver */ -+static struct cpufreq_driver bcm2835_cpufreq_driver = { -+ .name = "BCM2835 CPUFreq", -+ .init = bcm2835_cpufreq_driver_init, -+ .verify = cpufreq_generic_frequency_table_verify, -+ .target_index = bcm2835_cpufreq_driver_target_index, -+ .get = bcm2835_cpufreq_driver_get, -+ .attr = cpufreq_generic_attr, -+}; -+ -+MODULE_AUTHOR("Dorian Peake and Dom Cobley"); -+MODULE_DESCRIPTION("CPU frequency driver for BCM2835 chip"); -+MODULE_LICENSE("GPL"); -+ -+module_init(bcm2835_cpufreq_module_init); -+module_exit(bcm2835_cpufreq_module_exit); |