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| author | Stephen Boyd <sboyd@codeaurora.org> | 2012-02-22 01:39:37 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2012-02-24 17:42:21 +0000 |
| commit | f8e56c42e4e3527f629682ca123f881c1bea8500 (patch) | |
| tree | 8a7dabb091612b50de7641d607dd0eca378d8f49 /arch/arm/mach-msm/timer.c | |
| parent | 6905a65879b51d326396e63dfea40861a30bc17f (diff) | |
| download | lwn-f8e56c42e4e3527f629682ca123f881c1bea8500.tar.gz lwn-f8e56c42e4e3527f629682ca123f881c1bea8500.zip | |
msm: timer: Support sched_clock()
Now that sched_clock is mandatory on ARM it's simple to add
sched_clock support to the MSM timer code. Add it so that we get
more accurate sched_clock output than the jiffies based version
that's provided by default.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm/mach-msm/timer.c')
| -rw-r--r-- | arch/arm/mach-msm/timer.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c index 11d0d8f2656c..61983daa7bba 100644 --- a/arch/arm/mach-msm/timer.c +++ b/arch/arm/mach-msm/timer.c @@ -24,6 +24,7 @@ #include <asm/mach/time.h> #include <asm/hardware/gic.h> #include <asm/localtimer.h> +#include <asm/sched_clock.h> #include <mach/msm_iomap.h> #include <mach/cpu.h> @@ -105,12 +106,12 @@ static union { static void __iomem *source_base; -static cycle_t msm_read_timer_count(struct clocksource *cs) +static notrace cycle_t msm_read_timer_count(struct clocksource *cs) { return readl_relaxed(source_base + TIMER_COUNT_VAL); } -static cycle_t msm_read_timer_count_shift(struct clocksource *cs) +static notrace cycle_t msm_read_timer_count_shift(struct clocksource *cs) { /* * Shift timer count down by a constant due to unreliable lower bits @@ -127,6 +128,11 @@ static struct clocksource msm_clocksource = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +static notrace u32 msm_sched_clock_read(void) +{ + return msm_clocksource.read(&msm_clocksource); +} + static void __init msm_timer_init(void) { struct clock_event_device *ce = &msm_clockevent; @@ -189,6 +195,8 @@ err: res = clocksource_register_hz(cs, dgt_hz); if (res) pr_err("clocksource_register failed\n"); + setup_sched_clock(msm_sched_clock_read, + cpu_is_msm7x01() ? 32 - MSM_DGT_SHIFT : 32, dgt_hz); } #ifdef CONFIG_LOCAL_TIMERS |