Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[pandora-kernel.git] / arch / arm / plat-omap / common.c

diff --git a/arch/arm/plat-omap/common.c b/arch/arm/plat-omap/common.c
index bf1eaf3..dddc027 100644 (file)
--- a/arch/arm/plat-omap/common.c
+++ b/arch/arm/plat-omap/common.c
@@ -172,6 +172,32 @@ unsigned long long sched_clock(void)
                                  clocksource_32k.mult, clocksource_32k.shift);
 }
 
+/**
+ * read_persistent_clock -  Return time from a persistent clock.
+ *
+ * Reads the time from a source which isn't disabled during PM, the
+ * 32k sync timer.  Convert the cycles elapsed since last read into
+ * nsecs and adds to a monotonically increasing timespec.
+ */
+static struct timespec persistent_ts;
+static cycles_t cycles, last_cycles;
+void read_persistent_clock(struct timespec *ts)
+{
+       unsigned long long nsecs;
+       cycles_t delta;
+       struct timespec *tsp = &persistent_ts;
+
+       last_cycles = cycles;
+       cycles = clocksource_32k.read(&clocksource_32k);
+       delta = cycles - last_cycles;
+
+       nsecs = clocksource_cyc2ns(delta,
+                                  clocksource_32k.mult, clocksource_32k.shift);
+
+       timespec_add_ns(tsp, nsecs);
+       *ts = *tsp;
+}
+
 static int __init omap_init_clocksource_32k(void)
 {
        static char err[] __initdata = KERN_ERR