ARM: 5704/1: U300 sched_clock implementation v2

[pandora-kernel.git] / arch / arm / mach-u300 / timer.c

diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index cce5320..26d26f5 100644 (file)
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -346,6 +346,21 @@ static struct clocksource clocksource_u300_1mhz = {
        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+/*
+ * Override the global weak sched_clock symbol with this
+ * local implementation which uses the clocksource to get some
+ * better resolution when scheduling the kernel. We accept that
+ * this wraps around for now, since it is just a relative time
+ * stamp. (Inspired by OMAP implementation.)
+ */
+unsigned long long notrace sched_clock(void)
+{
+       return clocksource_cyc2ns(clocksource_u300_1mhz.read(
+                                 &clocksource_u300_1mhz),
+                                 clocksource_u300_1mhz.mult,
+                                 clocksource_u300_1mhz.shift);
+}
+
 
 /*
  * This sets up the system timers, clock source and clock event.