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| author | Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> | 2015-03-07 10:30:31 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:31 +0200 |
| commit | 944081ac53c38f7f2b86165553bf9d4aa9fd5d97 (patch) | |
| tree | c2104c040f6b30926de7792aa5e0263ad1d55c18 /arch/mips/jz4740 | |
| parent | a6071af914caec91d97d9db42a1bb0e9d6ad6890 (diff) | |
| download | blackbird-op-linux-944081ac53c38f7f2b86165553bf9d4aa9fd5d97.tar.gz blackbird-op-linux-944081ac53c38f7f2b86165553bf9d4aa9fd5d97.zip | |
MIPS: jz4740: Implement read_sched_clock
Use jz4740 timer counter for sched_clock source. This implementation will
give high resolution cputime accounting.
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: macro@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9485/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/jz4740')
| -rw-r--r-- | arch/mips/jz4740/time.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c index 5e430ce9ac7e..72b0cecbc17c 100644 --- a/arch/mips/jz4740/time.c +++ b/arch/mips/jz4740/time.c @@ -18,6 +18,7 @@ #include <linux/time.h> #include <linux/clockchips.h> +#include <linux/sched_clock.h> #include <asm/mach-jz4740/irq.h> #include <asm/mach-jz4740/timer.h> @@ -43,6 +44,11 @@ static struct clocksource jz4740_clocksource = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +static u64 notrace jz4740_read_sched_clock(void) +{ + return jz4740_timer_get_count(TIMER_CLOCKSOURCE); +} + static irqreturn_t jz4740_clockevent_irq(int irq, void *devid) { struct clock_event_device *cd = devid; @@ -126,6 +132,8 @@ void __init plat_time_init(void) if (ret) printk(KERN_ERR "Failed to register clocksource: %d\n", ret); + sched_clock_register(jz4740_read_sched_clock, 16, clk_rate); + setup_irq(JZ4740_IRQ_TCU0, &timer_irqaction); ctrl = JZ_TIMER_CTRL_PRESCALE_16 | JZ_TIMER_CTRL_SRC_EXT; |
