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Commit a6071af9 authored by Deng-Cheng Zhu's avatar Deng-Cheng Zhu Committed by Ralf Baechle
Browse files

MIPS: cevt-txx9: Implement read_sched_clock 



Use txx9 up-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/9484/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent c41cef36

arch/mips/kernel/cevt-txx9.c

+9 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/sched_clock.h>

#include <asm/time.h>

#include <asm/txx9tmr.h>
@@ -46,6 +47,11 @@ static struct txx9_clocksource txx9_clocksource = { 
	},

};



static u64 notrace txx9_read_sched_clock(void)

{

	return __raw_readl(&txx9_clocksource.tmrptr->trr);

}



void __init txx9_clocksource_init(unsigned long baseaddr,

				  unsigned int imbusclk)

{
@@ -61,6 +67,9 @@ void __init txx9_clocksource_init(unsigned long baseaddr, 
	__raw_writel(1 << TXX9_CLOCKSOURCE_BITS, &tmrptr->cpra);

	__raw_writel(TCR_BASE | TXx9_TMTCR_TCE, &tmrptr->tcr);

	txx9_clocksource.tmrptr = tmrptr;



	sched_clock_register(txx9_read_sched_clock, TXX9_CLOCKSOURCE_BITS,

			     TIMER_CLK(imbusclk));

}



struct txx9_clock_event_device {