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| author | Xinyu Chen <xinyu.chen@freescale.com> | 2010-03-24 10:18:23 +0800 |
|---|---|---|
| committer | Xinyu Chen <xinyu.chen@freescale.com> | 2010-03-26 09:48:18 +0800 |
| commit | c68afebba8ce224668788a77dedde660abfad830 (patch) | |
| tree | 37fe10861402be9ca6804c7351bd3b0b2033c5b8 | |
| parent | 1b07ae665ef8afc6e3450398fd9fbb0a81395c69 (diff) | |
ENGR00121913 Add sched_clock support to i.mx platform
Add sched_clock() implement for i.mx platform to support nanosecond
resolution time for sched clock used by scheduler.
This case is found by running Android's CTS case: android.os.cts.DebugTest,
which tests the clock_gettime with CLOCK_THREAD_CPUTIME_ID clock,
and needs nanosecond resolution sched clock.
It returns 0 before timer initialize, return GPT counter after that.
Signed-off-by: Xinyu Chen <xinyu.chen@freescale.com>
| -rw-r--r-- | arch/arm/plat-mxc/time.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/time.c b/arch/arm/plat-mxc/time.c index fbf86e42c3f..c958688ba24 100644 --- a/arch/arm/plat-mxc/time.c +++ b/arch/arm/plat-mxc/time.c @@ -116,6 +116,18 @@ static struct clocksource clocksource_mxc = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +unsigned long long sched_clock(void) +{ + unsigned long long ret; + + if (!timer_base) + return 0; + + ret = (unsigned long long)clocksource_mxc.read(&clocksource_mxc); + ret = (ret * clocksource_mxc.mult_orig) >> clocksource_mxc.shift; + return ret; +} + static int __init mxc_clocksource_init(struct clk *timer_clk) { unsigned int c = clk_get_rate(timer_clk); |