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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-01-06 22:33:32 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-01-06 22:33:32 +0000
commit404a02cbd2ae8bf256a2fa1169bdfe86bb5ebb34 (patch)
tree99119edc53fdca73ed7586829b8ee736e09440b3 /arch/arm/mach-davinci/time.c
parent28cdac6690cb113856293bf79b40de33dbd8f974 (diff)
parent1051b9f0f9eab8091fe3bf98320741adf36b4cfa (diff)
Merge branch 'devel-stable' into devel
Conflicts: arch/arm/mach-pxa/clock.c arch/arm/mach-pxa/clock.h
Diffstat (limited to 'arch/arm/mach-davinci/time.c')
-rw-r--r--arch/arm/mach-davinci/time.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index c1486716de7..e1969ce904d 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c
@@ -272,14 +272,35 @@ static cycle_t read_cycles(struct clocksource *cs)
return (cycles_t)timer32_read(t);
}
+/*
+ * Kernel assumes that sched_clock can be called early but may not have
+ * things ready yet.
+ */
+static cycle_t read_dummy(struct clocksource *cs)
+{
+ return 0;
+}
+
+
static struct clocksource clocksource_davinci = {
.rating = 300,
- .read = read_cycles,
+ .read = read_dummy,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/*
+ * Overwrite weak default sched_clock with something more precise
+ */
+unsigned long long notrace sched_clock(void)
+{
+ const cycle_t cyc = clocksource_davinci.read(&clocksource_davinci);
+
+ return clocksource_cyc2ns(cyc, clocksource_davinci.mult,
+ clocksource_davinci.shift);
+}
+
+/*
* clockevent
*/
static int davinci_set_next_event(unsigned long cycles,
@@ -376,6 +397,7 @@ static void __init davinci_timer_init(void)
davinci_clock_tick_rate = clk_get_rate(timer_clk);
/* setup clocksource */
+ clocksource_davinci.read = read_cycles;
clocksource_davinci.name = id_to_name[clocksource_id];
if (clocksource_register_hz(&clocksource_davinci,
davinci_clock_tick_rate))