summaryrefslogtreecommitdiff
path: root/arch/arm/mach-u300/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-u300/timer.c')
-rw-r--r--arch/arm/mach-u300/timer.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index 26d26f5100fe..3fc4472719be 100644
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -15,6 +15,8 @@
#include <linux/clocksource.h>
#include <linux/types.h>
#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
#include <mach/hardware.h>
@@ -23,7 +25,8 @@
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
-#include "clock.h"
+/* Be able to sleep for atleast 4 seconds (usually more) */
+#define APPTIMER_MIN_RANGE 4
/*
* APP side special timer registers
@@ -307,8 +310,6 @@ static struct clock_event_device clockevent_u300_1mhz = {
.name = "GPT1",
.rating = 300, /* Reasonably fast and accurate clock event */
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
- .shift = 22,
.set_next_event = u300_set_next_event,
.set_mode = u300_set_mode,
};
@@ -341,8 +342,6 @@ static struct clocksource clocksource_u300_1mhz = {
.rating = 300, /* Reasonably fast and accurate clock source */
.read = u300_get_cycles,
.mask = CLOCKSOURCE_MASK(32), /* 32 bits */
- /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
- .shift = 22,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -367,7 +366,15 @@ unsigned long long notrace sched_clock(void)
*/
static void __init u300_timer_init(void)
{
- u300_enable_timer_clock();
+ struct clk *clk;
+ unsigned long rate;
+
+ /* Clock the interrupt controller */
+ clk = clk_get_sys("apptimer", NULL);
+ BUG_ON(IS_ERR(clk));
+ clk_enable(clk);
+ rate = clk_get_rate(clk);
+
/*
* Disable the "OS" and "DD" timers - these are designed for Symbian!
* Example usage in cnh1601578 cpu subsystem pd_timer_app.c
@@ -405,15 +412,14 @@ static void __init u300_timer_init(void)
writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE,
U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT2);
- /* This is a pure microsecond clock source */
- clocksource_u300_1mhz.mult =
- clocksource_khz2mult(1000, clocksource_u300_1mhz.shift);
+ clocksource_calc_mult_shift(&clocksource_u300_1mhz,
+ rate, APPTIMER_MIN_RANGE);
if (clocksource_register(&clocksource_u300_1mhz))
printk(KERN_ERR "timer: failed to initialize clock "
"source %s\n", clocksource_u300_1mhz.name);
- clockevent_u300_1mhz.mult =
- div_sc(1000000, NSEC_PER_SEC, clockevent_u300_1mhz.shift);
+ clockevents_calc_mult_shift(&clockevent_u300_1mhz,
+ rate, APPTIMER_MIN_RANGE);
/* 32bit counter, so 32bits delta is max */
clockevent_u300_1mhz.max_delta_ns =
clockevent_delta2ns(0xffffffff, &clockevent_u300_1mhz);