From f8e56c42e4e3527f629682ca123f881c1bea8500 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Wed, 22 Feb 2012 01:39:37 +0000 Subject: 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 Acked-by: David Brown Signed-off-by: Marc Zyngier --- arch/arm/mach-msm/timer.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'arch/arm/mach-msm') 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 #include #include +#include #include #include @@ -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 -- cgit v1.2.3