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Commit 944081ac authored by Deng-Cheng Zhu's avatar Deng-Cheng Zhu Committed by Ralf Baechle
Browse files

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: default avatarDeng-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: default avatarRalf Baechle <ralf@linux-mips.org>
parent a6071af9

arch/mips/jz4740/time.c

+8 −0
Original line number Diff line number Diff line
@@ -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;