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Diffstat (limited to 'arch/microblaze/kernel/timer.c')
-rw-r--r--arch/microblaze/kernel/timer.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index ed61b2f17719..b1380ae93ae1 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -28,6 +28,7 @@
#include <asm/prom.h>
#include <asm/irq.h>
#include <asm/system.h>
+#include <linux/cnt32_to_63.h>
#ifdef CONFIG_SELFMOD_TIMER
#include <asm/selfmod.h>
@@ -135,7 +136,7 @@ static void microblaze_timer_set_mode(enum clock_event_mode mode,
static struct clock_event_device clockevent_microblaze_timer = {
.name = "microblaze_clockevent",
.features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
- .shift = 24,
+ .shift = 8,
.rating = 300,
.set_next_event = microblaze_timer_set_next_event,
.set_mode = microblaze_timer_set_mode,
@@ -195,7 +196,7 @@ static cycle_t microblaze_cc_read(const struct cyclecounter *cc)
static struct cyclecounter microblaze_cc = {
.read = microblaze_cc_read,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 24,
+ .shift = 8,
};
int __init init_microblaze_timecounter(void)
@@ -213,7 +214,7 @@ static struct clocksource clocksource_microblaze = {
.rating = 300,
.read = microblaze_read,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 24, /* I can shift it */
+ .shift = 8, /* I can shift it */
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -235,6 +236,12 @@ static int __init microblaze_clocksource_init(void)
return 0;
}
+/*
+ * We have to protect accesses before timer initialization
+ * and return 0 for sched_clock function below.
+ */
+static int timer_initialized;
+
void __init time_init(void)
{
u32 irq, i = 0;
@@ -289,4 +296,15 @@ void __init time_init(void)
#endif
microblaze_clocksource_init();
microblaze_clockevent_init();
+ timer_initialized = 1;
+}
+
+unsigned long long notrace sched_clock(void)
+{
+ if (timer_initialized) {
+ struct clocksource *cs = &clocksource_microblaze;
+ cycle_t cyc = cnt32_to_63(cs->read(NULL));
+ return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+ }
+ return 0;
}