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Date: Tue, 21 Feb 2012 17:39:37 -0800 From: Stephen Boyd <sboyd@...eaurora.org> To: linux-arm-msm@...r.kernel.org Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Marc Zyngier <marc.zyngier@....com>, David Brown <davidb@...eaurora.org> Subject: [PATCH] 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@...eaurora.org> Cc: Marc Zyngier <marc.zyngier@....com> Cc: David Brown <davidb@...eaurora.org> --- 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 -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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