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>
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@ -14,6 +14,7 @@
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/sched_clock.h>
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#include <asm/time.h>
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#include <asm/txx9tmr.h>
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@ -46,6 +47,11 @@ static struct txx9_clocksource txx9_clocksource = {
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},
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};
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static u64 notrace txx9_read_sched_clock(void)
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{
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return __raw_readl(&txx9_clocksource.tmrptr->trr);
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}
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void __init txx9_clocksource_init(unsigned long baseaddr,
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unsigned int imbusclk)
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{
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@ -61,6 +67,9 @@ void __init txx9_clocksource_init(unsigned long baseaddr,
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__raw_writel(1 << TXX9_CLOCKSOURCE_BITS, &tmrptr->cpra);
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__raw_writel(TCR_BASE | TXx9_TMTCR_TCE, &tmrptr->tcr);
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txx9_clocksource.tmrptr = tmrptr;
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sched_clock_register(txx9_read_sched_clock, TXX9_CLOCKSOURCE_BITS,
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TIMER_CLK(imbusclk));
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}
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struct txx9_clock_event_device {
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