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>

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 11d0d8f..61983da 100644 (file)
--- 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