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Diffstat (limited to 'arch/sh/kernel/time_32.c')
-rw-r--r--arch/sh/kernel/time_32.c71
1 files changed, 18 insertions, 53 deletions
diff --git a/arch/sh/kernel/time_32.c b/arch/sh/kernel/time_32.c
index 8457f83242c5..c34e1e0f9b02 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;
@@ -112,7 +104,6 @@ int do_settimeofday(struct timespec *tv)
EXPORT_SYMBOL(do_settimeofday);
#endif /* !CONFIG_GENERIC_TIME */
-#ifndef CONFIG_GENERIC_CLOCKEVENTS
/* last time the RTC clock got updated */
static long last_rtc_update;
@@ -156,7 +147,6 @@ void handle_timer_tick(void)
update_process_times(user_mode(get_irq_regs()));
#endif
}
-#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
#ifdef CONFIG_PM
int timer_suspend(struct sys_device *dev, pm_message_t state)
@@ -189,7 +179,12 @@ static struct sysdev_class timer_sysclass = {
static int __init timer_init_sysfs(void)
{
- int ret = sysdev_class_register(&timer_sysclass);
+ int ret;
+
+ if (!sys_timer)
+ return 0;
+
+ ret = sysdev_class_register(&timer_sysclass);
if (ret != 0)
return ret;
@@ -200,42 +195,21 @@ 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
@@ -259,17 +233,8 @@ void __init time_init(void)
* initialized for us.
*/
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);
+ if (unlikely(!sys_timer))
+ panic("System timer missing.\n");
+ printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
}