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MIPS: csrc-ioasic: Implement read_sched_clock 

Use DEC I/O ASIC's free-running counter for sched_clock source. This
implementation will give high resolution cputime accounting.

Acked-by: Maciej W. Rozycki <macro@linux-mips.org>
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/9482/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2015-03-07 10:30:28 -08:00 committed by Ralf Baechle
parent 317adb12e5
commit 7cb24b7003
1 changed files with 9 additions and 0 deletions
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9
arch/mips/kernel/csrc-ioasic.c
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@ -14,6 +14,7 @@
* GNU General Public License for more details.
*/
#include <linux/clocksource.h>
#include <linux/sched_clock.h>
#include <linux/init.h>
#include <asm/ds1287.h>
@ -33,6 +34,11 @@ static struct clocksource clocksource_dec = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static u64 notrace dec_ioasic_read_sched_clock(void)
{
return ioasic_read(IO_REG_FCTR);
}
int __init dec_ioasic_clocksource_init(void)
{
unsigned int freq;
@ -61,5 +67,8 @@ int __init dec_ioasic_clocksource_init(void)
clocksource_dec.rating = 200 + freq / 10000000;
clocksource_register_hz(&clocksource_dec, freq);
sched_clock_register(dec_ioasic_read_sched_clock, 32, freq);
return 0;
}