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);
 }