ARM: OMAP: Timer32K: Move 32k-based sched_clock() to common code

[linux-2.6-omap-h63xx.git] / arch / arm / plat-omap / common.c

diff --git a/arch/arm/plat-omap/common.c b/arch/arm/plat-omap/common.c
index 4f0f9c4e938ee7fbb2937c4fb4841de6de8acbcc..7f1cae16cfad66a95808690e434c6a10ef0a921f 100644 (file)
--- a/arch/arm/plat-omap/common.c
+++ b/arch/arm/plat-omap/common.c
@@ -193,6 +193,23 @@ static struct clocksource clocksource_32k = {
        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+/*
+ * Rounds down to nearest nsec.
+ */
+unsigned long long omap_32k_ticks_to_nsecs(unsigned long ticks_32k)
+{
+       return cyc2ns(&clocksource_32k, ticks_32k);
+}
+
+/*
+ * Returns current time from boot in nsecs. It's OK for this to wrap
+ * around for now, as it's just a relative time stamp.
+ */
+unsigned long long sched_clock(void)
+{
+       return omap_32k_ticks_to_nsecs(omap_32k_read());
+}
+
 static int __init omap_init_clocksource_32k(void)
 {
        static char err[] __initdata = KERN_ERR