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authorDeng-Cheng Zhu <dengcheng.zhu@imgtec.com>2015-03-07 10:30:31 -0800
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 17:21:31 +0200
commit944081ac53c38f7f2b86165553bf9d4aa9fd5d97 (patch)
treec2104c040f6b30926de7792aa5e0263ad1d55c18 /arch/mips/jz4740
parenta6071af914caec91d97d9db42a1bb0e9d6ad6890 (diff)
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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.c8
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;