[PATCH] msm: timer: Support sched_clock()
From: Stephen Boyd <hidden>
Date: 2012-02-22 01:39:43
Also in:
linux-arm-msm, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> Cc: Marc Zyngier <redacted> Cc: David Brown <redacted> --- This is based on Marc's mandatory sched_clock patch series located at git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git sched_clock-v3.3-rc3 arch/arm/mach-msm/timer.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 11d0d8f..61983da 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
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