From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 1/4] at91: fix timer rate
Date: Fri, 23 Nov 2012 16:55:01 +0100 [thread overview]
Message-ID: <1353686104-31295-1-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <20121123155224.GV8327@game.jcrosoft.org>
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@jcrosoft.com>
---
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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next prev parent reply other threads:[~2012-11-23 15:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-23 15:52 [PATCH 0/4] at91: some fixes Jean-Christophe PLAGNIOL-VILLARD
2012-11-23 15:55 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-11-23 15:55 ` [PATCH 2/4] atmel_nand: fix pmecc timeout Jean-Christophe PLAGNIOL-VILLARD
2012-11-23 15:55 ` [PATCH 3/4] at91: clock: check overclock for sam9260/9261/9263/9rl Jean-Christophe PLAGNIOL-VILLARD
2012-11-23 15:55 ` [PATCH 4/4] Revert "mtd: atmel_nand: optimize read/write buffer functions" Jean-Christophe PLAGNIOL-VILLARD
2012-11-24 3:42 ` 张忠山
2012-11-24 8:45 ` Jean-Christophe PLAGNIOL-VILLARD
2012-11-25 8:11 ` 张忠山
2012-11-25 19:32 ` Jean-Christophe PLAGNIOL-VILLARD
2012-11-26 2:17 ` 张忠山
2012-11-26 7:31 ` [PATCH 0/4] at91: some fixes Sascha Hauer
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