today the timer rate is hardcoded to 6MHz which is wrong the PIT rate is MCK / 16
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
arch/arm/mach-at91/at91sam926x_time.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 7411ad8..7425e0a 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -34,6 +34,7 @@
#include <mach/at91_rstc.h>
#include <mach/io.h>
#include <io.h>
+#include <linux/clk.h>
uint64_t at91sam9_clocksource_read(void)
{
@@ -48,16 +49,20 @@ static struct clocksource cs = {
static int clocksource_init (void)
{
+ u32 pit_rate;
+
/*
* Enable PITC Clock
* The clock is already enabled for system controller in boot
*/
at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_SYS);
+ pit_rate = clk_get_rate(clk_get(NULL, "mck")) / 16;
+
/* Enable PITC */
at91_sys_write(AT91_PIT_MR, 0xfffff | AT91_PIT_PITEN);
- cs.mult = clocksource_hz2mult(1000000 * 6, cs.shift);
+ cs.mult = clocksource_hz2mult(pit_rate, cs.shift);
init_clock(&cs);
--
1.7.10.4
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