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Commit 27acdea8 authored by Deng-Cheng Zhu's avatar Deng-Cheng Zhu Committed by Ralf Baechle
Browse files

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: default avatarDeng-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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 788049e2

arch/mips/kernel/csrc-bcm1480.c

+8 −0
Original line number Diff line number Diff line
@@ -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);

}