[PATCH v3 6/7] ARM: smp_twd: add clock api support
Rob Herring
robherring2 at gmail.com
Tue Mar 8 18:34:36 EST 2011
From: Rob Herring <rob.herring at calxeda.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 calxeda.com>
---
v3: Save struct clk pointer for later use (cpufreq).
arch/arm/include/asm/smp_twd.h | 1 +
arch/arm/kernel/smp_twd.c | 14 ++++++++++++++
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h
index fed9981..6b0f591 100644
--- a/arch/arm/include/asm/smp_twd.h
+++ b/arch/arm/include/asm/smp_twd.h
@@ -24,5 +24,6 @@ extern void __iomem *twd_base;
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 60636f4..cce1171 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>
@@ -24,6 +26,7 @@
/* set up by the platform code */
void __iomem *twd_base;
+static struct clk *twd_clk;
static unsigned long twd_timer_rate;
static void twd_set_mode(enum clock_event_mode mode,
@@ -142,3 +145,14 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clockevents_register_device(clk);
}
+
+void __init twd_timer_init(void __iomem *base)
+{
+ twd_clk = clk_get_sys("smp_twd", NULL);
+ if (!IS_ERR(twd_clk))
+ twd_timer_rate = clk_get_rate(twd_clk);
+ else
+ twd_clk = NULL;
+
+ twd_base = base;
+}
--
1.7.1
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