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 <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>
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@ -12,6 +12,7 @@
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* GNU General Public License for more details.
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* GNU General Public License for more details.
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*/
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*/
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#include <linux/clocksource.h>
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#include <linux/clocksource.h>
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#include <linux/sched_clock.h>
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#include <asm/addrspace.h>
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#include <asm/addrspace.h>
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#include <asm/io.h>
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#include <asm/io.h>
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@ -37,6 +38,11 @@ struct clocksource bcm1480_clocksource = {
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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};
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static u64 notrace sb1480_read_sched_clock(void)
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{
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return __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));
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}
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void __init sb1480_clocksource_init(void)
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void __init sb1480_clocksource_init(void)
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{
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{
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struct clocksource *cs = &bcm1480_clocksource;
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struct clocksource *cs = &bcm1480_clocksource;
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@ -46,4 +52,6 @@ void __init sb1480_clocksource_init(void)
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plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
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plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
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zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
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zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);
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clocksource_register_hz(cs, zbbus);
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clocksource_register_hz(cs, zbbus);
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sched_clock_register(sb1480_read_sched_clock, 64, zbbus);
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}
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}
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