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MIPS: csrc-sb1250: Implement read_sched_clock

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Use sb1250 hpt 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/9488/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2015-03-07 10:30:34 -08:00 committed by Ralf Baechle
parent 0dc886aba2
commit 262f1c9291
1 changed files with 8 additions and 0 deletions
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8
arch/mips/kernel/csrc-sb1250.c
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@ -12,6 +12,7 @@
* GNU General Public License for more details.
*/
#include <linux/clocksource.h>
#include <linux/sched_clock.h>
#include <asm/addrspace.h>
#include <asm/io.h>
@ -53,6 +54,11 @@ struct clocksource bcm1250_clocksource = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static u64 notrace sb1250_read_sched_clock(void)
{
return sb1250_hpt_get_cycles();
}
void __init sb1250_clocksource_init(void)
{
struct clocksource *cs = &bcm1250_clocksource;
@ -69,4 +75,6 @@ void __init sb1250_clocksource_init(void)
R_SCD_TIMER_CFG)));
clocksource_register_hz(cs, V_SCD_TIMER_FREQ);
sched_clock_register(sb1250_read_sched_clock, 23, V_SCD_TIMER_FREQ);
}