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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: 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/9484/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2015-03-07 10:30:30 -08:00 committed by Ralf Baechle
parent c41cef3653
commit a6071af914
1 changed files with 9 additions and 0 deletions
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9
arch/mips/kernel/cevt-txx9.c
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@ -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 {