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MIPS: csrc-bcm1480: Implement read_sched_clock

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Use the ZBbus cycle 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/9480/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2015-03-07 10:30:26 -08:00 committed by Ralf Baechle
parent 788049e2d5
commit 27acdea8fe
1 changed files with 8 additions and 0 deletions
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8
arch/mips/kernel/csrc-bcm1480.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>
@ -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);
}