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| author | Jonathan Austin <Jonathan.Austin@arm.com> | 2012-09-21 18:51:44 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-26 22:57:52 +0100 |
| commit | 56942fec06efa0e17df0f4c3b438332c923b9014 (patch) | |
| tree | 89b604c987b7f6a0eaaa16af7a9d8f45711349a7 /arch/arm/include | |
| parent | a1b2dde70419ae947fd7c9c8fcad7da005dc600e (diff) | |
| download | linux-stable-56942fec06efa0e17df0f4c3b438332c923b9014.tar.gz linux-stable-56942fec06efa0e17df0f4c3b438332c923b9014.tar.bz2 linux-stable-56942fec06efa0e17df0f4c3b438332c923b9014.zip | |
ARM: 7538/1: delay: add registration mechanism for delay timer sources
The current timer-based delay loop relies on the architected timer to
initiate the switch away from the polling-based implementation. This is
unfortunate for platforms without the architected timers but with a
suitable delay source (that is, constant frequency, always powered-up
and ticking as long as the CPUs are online).
This patch introduces a registration mechanism for the delay timer
(which provides an unconditional read_current_timer implementation) and
updates the architected timer code to use the new interface.
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/arch_timer.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/delay.h | 9 | ||||
| -rw-r--r-- | arch/arm/include/asm/timex.h | 6 |
3 files changed, 9 insertions, 7 deletions
diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h index ad9b155c8262..d40229d9a1c9 100644 --- a/arch/arm/include/asm/arch_timer.h +++ b/arch/arm/include/asm/arch_timer.h @@ -5,7 +5,6 @@ #include <linux/clocksource.h> #ifdef CONFIG_ARM_ARCH_TIMER -#define ARCH_HAS_READ_CURRENT_TIMER int arch_timer_of_register(void); int arch_timer_sched_clock_init(void); struct timecounter *arch_timer_get_timecounter(void); diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h index dc6145120de3..ab98fdd083bd 100644 --- a/arch/arm/include/asm/delay.h +++ b/arch/arm/include/asm/delay.h @@ -15,6 +15,11 @@ #ifndef __ASSEMBLY__ +struct delay_timer { + unsigned long (*read_current_timer)(void); + unsigned long freq; +}; + extern struct arm_delay_ops { void (*delay)(unsigned long); void (*const_udelay)(unsigned long); @@ -56,6 +61,10 @@ extern void __loop_delay(unsigned long loops); extern void __loop_udelay(unsigned long usecs); extern void __loop_const_udelay(unsigned long); +/* Delay-loop timer registration. */ +#define ARCH_HAS_READ_CURRENT_TIMER +extern void register_current_timer_delay(const struct delay_timer *timer); + #endif /* __ASSEMBLY__ */ #endif /* defined(_ARM_DELAY_H) */ diff --git a/arch/arm/include/asm/timex.h b/arch/arm/include/asm/timex.h index ce119442277c..9acc135dad94 100644 --- a/arch/arm/include/asm/timex.h +++ b/arch/arm/include/asm/timex.h @@ -12,15 +12,9 @@ #ifndef _ASMARM_TIMEX_H #define _ASMARM_TIMEX_H -#include <asm/arch_timer.h> #include <mach/timex.h> typedef unsigned long cycles_t; - -#ifdef ARCH_HAS_READ_CURRENT_TIMER #define get_cycles() ({ cycles_t c; read_current_timer(&c) ? 0 : c; }) -#else -#define get_cycles() (0) -#endif #endif |