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| author | Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> | 2015-03-07 10:30:30 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:30 +0200 |
| commit | a6071af914caec91d97d9db42a1bb0e9d6ad6890 (patch) | |
| tree | 59a5fab286287203328d6b19372e9aac7332145a /arch/mips/kernel | |
| parent | c41cef36530a4b4afa79981e8f1a31f49b871a90 (diff) | |
| download | op-kernel-dev-a6071af914caec91d97d9db42a1bb0e9d6ad6890.zip op-kernel-dev-a6071af914caec91d97d9db42a1bb0e9d6ad6890.tar.gz | |
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>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/cevt-txx9.c | 9 |
1 files changed, 9 insertions, 0 deletions
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 <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 { |
