#include <linux/errno.h>
#include <linux/profile.h>
#include <linux/sysdev.h>
+#include <linux/timer.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/leds.h>
+#include <asm/thread_info.h>
+#include <asm/mach/time.h>
u64 jiffies_64 = INITIAL_JIFFIES;
EXPORT_SYMBOL(jiffies_64);
+/*
+ * Our system timer.
+ */
+struct sys_timer *system_timer;
+
extern unsigned long wall_jiffies;
/* this needs a better home */
-spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_SPINLOCK(rtc_lock);
#ifdef CONFIG_SA1100_RTC_MODULE
EXPORT_SYMBOL(rtc_lock);
/* change this if you have some constant time drift */
#define USECS_PER_JIFFY (1000000/HZ)
-static int dummy_set_rtc(void)
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
{
- return 0;
+ unsigned long fp, pc = instruction_pointer(regs);
+
+ if (in_lock_functions(pc)) {
+ fp = regs->ARM_fp;
+ pc = pc_pointer(((unsigned long *)fp)[-1]);
+ }
+
+ return pc;
}
+EXPORT_SYMBOL(profile_pc);
+#endif
/*
* hook for setting the RTC's idea of the current time.
*/
-int (*set_rtc)(void) = dummy_set_rtc;
+int (*set_rtc)(void);
static unsigned long dummy_gettimeoffset(void)
{
return 0;
}
-/*
- * hook for getting the time offset. Note that it is
- * always called with interrupts disabled.
- */
-unsigned long (*gettimeoffset)(void) = dummy_gettimeoffset;
-
/*
* Scheduler clock - returns current time in nanosec units.
* This is the default implementation. Sub-architecture
return (unsigned long long)jiffies * (1000000000 / HZ);
}
-/*
- * Handle kernel profile stuff...
- */
-static inline void do_profile(struct pt_regs *regs)
-{
-
- profile_hook(regs);
-
- if (!user_mode(regs) &&
- prof_buffer &&
- current->pid) {
- unsigned long pc = instruction_pointer(regs);
- extern int _stext;
-
- pc -= (unsigned long)&_stext;
-
- pc >>= prof_shift;
-
- if (pc >= prof_len)
- pc = prof_len - 1;
-
- prof_buffer[pc] += 1;
- }
-}
-
static unsigned long next_rtc_update;
/*
#endif
#ifdef CONFIG_LEDS_TIMER
-static void do_leds(void)
+static inline void do_leds(void)
{
static unsigned int count = 50;
}
}
#else
-#define do_leds()
+#define do_leds()
#endif
void do_gettimeofday(struct timeval *tv)
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = gettimeoffset();
+ usec = system_timer->offset();
lost = jiffies - wall_jiffies;
if (lost)
* wall time. Discover what correction gettimeofday() would have
* done, and then undo it!
*/
- nsec -= gettimeoffset() * NSEC_PER_USEC;
+ nsec -= system_timer->offset() * NSEC_PER_USEC;
nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
EXPORT_SYMBOL(do_settimeofday);
-static struct irqaction timer_irq = {
- .name = "timer",
- .flags = SA_INTERRUPT,
-};
+/**
+ * save_time_delta - Save the offset between system time and RTC time
+ * @delta: pointer to timespec to store delta
+ * @rtc: pointer to timespec for current RTC time
+ *
+ * Return a delta between the system time and the RTC time, such
+ * that system time can be restored later with restore_time_delta()
+ */
+void save_time_delta(struct timespec *delta, struct timespec *rtc)
+{
+ set_normalized_timespec(delta,
+ xtime.tv_sec - rtc->tv_sec,
+ xtime.tv_nsec - rtc->tv_nsec);
+}
+EXPORT_SYMBOL(save_time_delta);
+
+/**
+ * restore_time_delta - Restore the current system time
+ * @delta: delta returned by save_time_delta()
+ * @rtc: pointer to timespec for current RTC time
+ */
+void restore_time_delta(struct timespec *delta, struct timespec *rtc)
+{
+ struct timespec ts;
+
+ set_normalized_timespec(&ts,
+ delta->tv_sec + rtc->tv_sec,
+ delta->tv_nsec + rtc->tv_nsec);
+
+ do_settimeofday(&ts);
+}
+EXPORT_SYMBOL(restore_time_delta);
/*
- * Include architecture specific code
+ * Kernel system timer support.
*/
-#include <asm/arch/time.h>
+void timer_tick(struct pt_regs *regs)
+{
+ profile_tick(CPU_PROFILING, regs);
+ do_leds();
+ do_set_rtc();
+ do_timer(regs);
+#ifndef CONFIG_SMP
+ update_process_times(user_mode(regs));
+#endif
+}
+
+#ifdef CONFIG_PM
+static int timer_suspend(struct sys_device *dev, u32 state)
+{
+ struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
+
+ if (timer->suspend != NULL)
+ timer->suspend();
+
+ return 0;
+}
+
+static int timer_resume(struct sys_device *dev)
+{
+ struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
+
+ if (timer->resume != NULL)
+ timer->resume();
+
+ return 0;
+}
+#else
+#define timer_suspend NULL
+#define timer_resume NULL
+#endif
+
+static struct sysdev_class timer_sysclass = {
+ set_kset_name("timer"),
+ .suspend = timer_suspend,
+ .resume = timer_resume,
+};
+
+static int __init timer_init_sysfs(void)
+{
+ int ret = sysdev_class_register(&timer_sysclass);
+ if (ret == 0) {
+ system_timer->dev.cls = &timer_sysclass;
+ ret = sysdev_register(&system_timer->dev);
+ }
+ return ret;
+}
+
+device_initcall(timer_init_sysfs);
+
+void __init time_init(void)
+{
+ if (system_timer->offset == NULL)
+ system_timer->offset = dummy_gettimeoffset;
+ system_timer->init();
+}
+