[PATCH v2 3/3] ARM: twd_smp: add clock api support
Rob Herring
robherring2 at gmail.com
Sat Oct 2 10:34:46 EDT 2010
From: Rob Herring <rob.herring at smooth-stone.com>
The private timer freq is currently dynamically detected
using jiffies count to determine the rate. This method adds
a delay to boot-up, so use the clock api instead to get the
clock rate.
Signed-off-by: Rob Herring <rob.herring at smooth-stone.com>
---
arch/arm/include/asm/smp_twd.h | 1 +
arch/arm/kernel/smp_twd.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h
index 634f357..99383d5 100644
--- a/arch/arm/include/asm/smp_twd.h
+++ b/arch/arm/include/asm/smp_twd.h
@@ -25,5 +25,6 @@ extern void __iomem *twd_base;
void twd_timer_stop(void);
int twd_timer_ack(void);
void twd_timer_setup(struct clock_event_device *);
+void twd_timer_init(void __iomem *base);
#endif
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 35882fb..be0983c 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -8,6 +8,8 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+#include <linux/clk.h>
+#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
@@ -151,6 +153,15 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clockevents_register_device(clk);
}
+void __init twd_timer_init(void __iomem *base)
+{
+ struct clk *clk = clk_get_sys("smp_twd", NULL);
+ if (!IS_ERR(clk))
+ twd_timer_rate = clk_get_rate(clk);
+
+ twd_base = base;
+}
+
#ifdef CONFIG_HOTPLUG_CPU
/*
* take a local timer down
--
1.7.0.4
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