Use jz4740 timer counter for sched_clock source. This implementation will
give high resolution cputime accounting.
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@xxxxxxxxxx>
---
arch/mips/jz4740/time.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c
index 5e430ce..72b0cecb 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;
--
1.8.5.3
