From 27acdea8fefeb6bec6f5af771df233c83aeac683 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Sat, 7 Mar 2015 10:30:26 -0800 Subject: MIPS: csrc-bcm1480: Implement read_sched_clock Use the ZBbus cycle 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/9480/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/csrc-bcm1480.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/mips/kernel') diff --git a/arch/mips/kernel/csrc-bcm1480.c b/arch/mips/kernel/csrc-bcm1480.c index 0a20a0f694a5..7f65b53d1b24 100644 --- a/arch/mips/kernel/csrc-bcm1480.c +++ b/arch/mips/kernel/csrc-bcm1480.c @@ -12,6 +12,7 @@ * GNU General Public License for more details. */ #include +#include #include #include @@ -37,6 +38,11 @@ struct clocksource bcm1480_clocksource = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +static u64 notrace sb1480_read_sched_clock(void) +{ + return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT)); +} + void __init sb1480_clocksource_init(void) { struct clocksource *cs = &bcm1480_clocksource; @@ -46,4 +52,6 @@ void __init sb1480_clocksource_init(void) plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG))); zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000); clocksource_register_hz(cs, zbbus); + + sched_clock_register(sb1480_read_sched_clock, 64, zbbus); } -- cgit v1.2.3-59-g8ed1b