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clocksource: qcom: Implement read_current_timer for udelay 

Setup the same timer used as the clocksource to be used as the
read_current_timer implementation. This allows us to support a
stable udelay implementation on MSMs where it's possible for the
CPUs to scale speeds independently of one another.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Stephen Boyd 2014-05-13 16:01:00 -07:00 committed by Daniel Lezcano
parent 3f04e3d3eb
commit 013be5adf5
1 changed files with 13 additions and 0 deletions
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13
drivers/clocksource/qcom-timer.c
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@ -26,6 +26,8 @@
#include <linux/of_irq.h>
#include <linux/sched_clock.h>
#include <asm/delay.h>
#define TIMER_MATCH_VAL 0x0000
#define TIMER_COUNT_VAL 0x0004
#define TIMER_ENABLE 0x0008
@ -179,6 +181,15 @@ static u64 notrace msm_sched_clock_read(void)
return msm_clocksource.read(&msm_clocksource);
}
static unsigned long msm_read_current_timer(void)
{
return msm_clocksource.read(&msm_clocksource);
}
static struct delay_timer msm_delay_timer = {
.read_current_timer = msm_read_current_timer,
};
static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,
bool percpu)
{
@ -217,6 +228,8 @@ static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,
if (res)
pr_err("clocksource_register failed\n");
sched_clock_register(msm_sched_clock_read, sched_bits, dgt_hz);
msm_delay_timer.freq = dgt_hz;
register_current_timer_delay(&msm_delay_timer);
}
#ifdef CONFIG_ARCH_QCOM