From a6071af914caec91d97d9db42a1bb0e9d6ad6890 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Sat, 7 Mar 2015 10:30:30 -0800 Subject: [PATCH] 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 Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9484/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/cevt-txx9.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/mips/kernel/cevt-txx9.c b/arch/mips/kernel/cevt-txx9.c index 2ae0846..7239324 100644 --- a/arch/mips/kernel/cevt-txx9.c +++ b/arch/mips/kernel/cevt-txx9.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -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 { -- 2.7.4