Provide a high-resolution sched_clock() based on the C0 counter using
the generic sched_clock infrastructure.
Signed-off-by: Rabin Vincent <rabin.vincent@xxxxxxxx>
---
arch/mips/Kconfig | 1 +
arch/mips/kernel/csrc-r4k.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f43aa53..8068259 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -924,6 +924,7 @@ config CSRC_IOASIC
bool
config CSRC_R4K
+ select GENERIC_SCHED_CLOCK
bool
config CSRC_GIC
diff --git a/arch/mips/kernel/csrc-r4k.c b/arch/mips/kernel/csrc-r4k.c
index decd1fa..318fec6 100644
--- a/arch/mips/kernel/csrc-r4k.c
+++ b/arch/mips/kernel/csrc-r4k.c
@@ -6,6 +6,7 @@
* Copyright (C) 2007 by Ralf Baechle
*/
#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
#include <linux/init.h>
#include <asm/time.h>
@@ -22,6 +23,11 @@ static struct clocksource clocksource_mips = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
+static u64 c0_hpt_read_sched_clock(void)
+{
+ return read_c0_count();
+}
+
int __init init_r4k_clocksource(void)
{
if (!cpu_has_counter || !mips_hpt_frequency)
@@ -31,6 +37,7 @@ int __init init_r4k_clocksource(void)
clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
+ sched_clock_register(c0_hpt_read_sched_clock, 32, mips_hpt_frequency);
return 0;
}
--
1.7.10.4
