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authorJaecheol Lee <jc.lee@samsung.com>2011-03-09 08:22:31 +0900
committerKukjin Kim <kgene.kim@samsung.com>2011-03-12 10:18:34 +0900
commit30fe76437bc2463b25e9a64ff1b28f293e3f3413 (patch)
treed15667b6f73d37003c50af93a1076e0c9f4b6ac6 /arch/arm/mach-exynos4
parent1663895cb434b586d022d6414f03316469cf284d (diff)
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ARM: EXYNOS4: Update HRT for supporting PM
This patch updates HRT driver for supporting PM. The resume function of PWM4 timer which is used clocksource is needed when kernel is resuming for restarting. Signed-off-by: Jaecheol Lee <jc.lee@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/mach-exynos4')
-rw-r--r--arch/arm/mach-exynos4/time.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos4/time.c b/arch/arm/mach-exynos4/time.c
index e30ac7043095..86b9fa0d3639 100644
--- a/arch/arm/mach-exynos4/time.c
+++ b/arch/arm/mach-exynos4/time.c
@@ -206,12 +206,28 @@ static cycle_t exynos4_pwm4_read(struct clocksource *cs)
return (cycle_t) ~__raw_readl(S3C_TIMERREG(0x40));
}
+static void exynos4_pwm4_resume(struct clocksource *cs)
+{
+ unsigned long pclk;
+
+ pclk = clk_get_rate(timerclk);
+
+ clk_set_rate(tdiv4, pclk / 2);
+ clk_set_parent(tin4, tdiv4);
+
+ exynos4_pwm_init(4, ~0);
+ exynos4_pwm_start(4, 1);
+}
+
struct clocksource pwm_clocksource = {
.name = "pwm_timer4",
.rating = 250,
.read = exynos4_pwm4_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS ,
+#ifdef CONFIG_PM
+ .resume = exynos4_pwm4_resume,
+#endif
};
static void __init exynos4_clocksource_init(void)