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authorMagnus Damm <damm@igel.co.jp>2009-01-22 09:55:31 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-01-29 16:44:17 +0900
commit955c0778723501cc16fec40501cd54b7e72d3e74 (patch)
tree5e97004d7d5e3cb990e385beb045664e26f20a48 /arch/sh/kernel/time_32.c
parentdc66ff6220f0a6c938df41add526d645852d9a75 (diff)
sh: rework clocksource and sched_clock
Rework and simplify the sched_clock and clocksource code. Instead of registering the clocksource in a shared file we move it into the tmu driver. Also, add code to handle sched_clock in the case of no clocksource. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/time_32.c')
-rw-r--r--arch/sh/kernel/time_32.c59
1 files changed, 9 insertions, 50 deletions
diff --git a/arch/sh/kernel/time_32.c b/arch/sh/kernel/time_32.c
index 8457f83242c..ca22eef669a 100644
--- a/arch/sh/kernel/time_32.c
+++ b/arch/sh/kernel/time_32.c
@@ -41,14 +41,6 @@ static int null_rtc_set_time(const time_t secs)
return 0;
}
-/*
- * Null high precision timer functions for systems lacking one.
- */
-static cycle_t null_hpt_read(void)
-{
- return 0;
-}
-
void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
@@ -200,42 +192,21 @@ device_initcall(timer_init_sysfs);
void (*board_time_init)(void);
-/*
- * Shamelessly based on the MIPS and Sparc64 work.
- */
-static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
-unsigned long sh_hpt_frequency = 0;
-
-#define NSEC_PER_CYC_SHIFT 10
-
-static struct clocksource clocksource_sh = {
+struct clocksource clocksource_sh = {
.name = "SuperH",
- .rating = 200,
- .mask = CLOCKSOURCE_MASK(32),
- .read = null_hpt_read,
- .shift = 16,
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
-static void __init init_sh_clocksource(void)
-{
- if (!sh_hpt_frequency || clocksource_sh.read == null_hpt_read)
- return;
-
- clocksource_sh.mult = clocksource_hz2mult(sh_hpt_frequency,
- clocksource_sh.shift);
-
- timer_ticks_per_nsec_quotient =
- clocksource_hz2mult(sh_hpt_frequency, NSEC_PER_CYC_SHIFT);
-
- clocksource_register(&clocksource_sh);
-}
-
#ifdef CONFIG_GENERIC_TIME
unsigned long long sched_clock(void)
{
- unsigned long long ticks = clocksource_sh.read();
- return (ticks * timer_ticks_per_nsec_quotient) >> NSEC_PER_CYC_SHIFT;
+ unsigned long long cycles;
+
+ /* jiffies based sched_clock if no clocksource is installed */
+ if (!clocksource_sh.rating)
+ return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
+
+ cycles = clocksource_sh.read();
+ return cyc2ns(&clocksource_sh, cycles);
}
#endif
@@ -260,16 +231,4 @@ void __init time_init(void)
*/
sys_timer = get_sys_timer();
printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
-
-
- if (sys_timer->ops->read)
- clocksource_sh.read = sys_timer->ops->read;
-
- init_sh_clocksource();
-
- if (sh_hpt_frequency)
- printk("Using %lu.%03lu MHz high precision timer.\n",
- ((sh_hpt_frequency + 500) / 1000) / 1000,
- ((sh_hpt_frequency + 500) / 1000) % 1000);
-
}