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clocksource: samsung_pwm_timer: Do not use clocksource_mmio 

In case of Samsung PWM timer, clocksource MMIO can not be used, because
custom suspend/resume callbacks are required.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Tomasz Figa 2013-06-17 00:13:06 +02:00
parent 61d7e2056e
commit 6792e636d5
2 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/clocksource/Kconfig
View File

@ -99,7 +99,6 @@ config CLKSRC_EXYNOS_MCT
config CLKSRC_SAMSUNG_PWM
bool
select CLKSRC_MMIO
help
This is a new clocksource driver for the PWM timer found in
Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver

19
drivers/clocksource/samsung_pwm_timer.c
View File

@ -298,6 +298,18 @@ static void __init samsung_clockevent_init(void)
}
}
static cycle_t samsung_clocksource_read(struct clocksource *c)
{
return ~readl_relaxed(pwm.source_reg);
}
static struct clocksource samsung_clocksource = {
.name = "samsung_clocksource_timer",
.rating = 250,
.read = samsung_clocksource_read,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
/*
* Override the global weak sched_clock symbol with this
* local implementation which uses the clocksource to get some
@ -307,7 +319,7 @@ static void __init samsung_clockevent_init(void)
*/
static u32 notrace samsung_read_sched_clock(void)
{
return ~__raw_readl(pwm.source_reg);
return samsung_clocksource_read(NULL);
}
static void __init samsung_clocksource_init(void)
@ -334,9 +346,8 @@ static void __init samsung_clocksource_init(void)
setup_sched_clock(samsung_read_sched_clock,
pwm.variant.bits, clock_rate);
ret = clocksource_mmio_init(pwm.source_reg, "samsung_clocksource_timer",
clock_rate, 250, pwm.variant.bits,
clocksource_mmio_readl_down);
samsung_clocksource.mask = CLOCKSOURCE_MASK(pwm.variant.bits);
ret = clocksource_register_hz(&samsung_clocksource, clock_rate);
if (ret)
panic("samsung_clocksource_timer: can't register clocksource\n");
}