ARM: mxs: Setup scheduler clock

Setup scheduler clock on ARM MXS platforms with a 32-bit timrot
such as i.MX28. This allows the scheduler to use sub-jiffy resolution.

The corresponding change for 16-bit v1 timrots is not possible
at the moment due to rounding issues with clock values wrapping
faster than once per several seconds in the common ARM platform code.

Signed-off-by: Stanislav Meduna <stano@meduna.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c
index 7c3792613392..856f4c796061 100644
--- a/arch/arm/mach-mxs/timer.c
+++ b/arch/arm/mach-mxs/timer.c
@@ -29,6 +29,7 @@
 #include <linux/of_irq.h>
 
 #include <asm/mach/time.h>
+#include <asm/sched_clock.h>
 #include <mach/mxs.h>
 #include <mach/common.h>
 
@@ -233,15 +234,22 @@ static struct clocksource clocksource_mxs = {
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+static u32 notrace mxs_read_sched_clock_v2(void)
+{
+        return ~readl_relaxed(mxs_timrot_base + HW_TIMROT_RUNNING_COUNTn(1));
+}
+
 static int __init mxs_clocksource_init(struct clk *timer_clk)
 {
         unsigned int c = clk_get_rate(timer_clk);
 
         if (timrot_is_v1())
                 clocksource_register_hz(&clocksource_mxs, c);
-        else
+        else {
                 clocksource_mmio_init(mxs_timrot_base + HW_TIMROT_RUNNING_COUNTn(1),
                         "mxs_timer", c, 200, 32, clocksource_mmio_readl_down);
+                setup_sched_clock(mxs_read_sched_clock_v2, 32, c);
+        }
 
         return 0;
 }