* 1998-12-20 Updated NTP code according to technical memorandum Jan '96
* "A Kernel Model for Precision Timekeeping" by Dave Mills
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/profile.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
+#include <linux/irq.h>
+
+#include <linux/mc146818rtc.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 */
DEFINE_SPINLOCK(rtc_lock);
*/
int (*set_rtc)(void);
+#ifndef CONFIG_GENERIC_TIME
static unsigned long dummy_gettimeoffset(void)
{
return 0;
}
+#endif
/*
* Scheduler clock - returns current time in nanosec units.
return (unsigned long long)jiffies * (1000000000 / HZ);
}
+/*
+ * An implementation of printk_clock() independent from
+ * sched_clock(). This avoids non-bootable kernels when
+ * printk_clock is enabled.
+ */
+unsigned long long printk_clock(void)
+{
+ return (unsigned long long)(jiffies - INITIAL_JIFFIES) *
+ (1000000000 / HZ);
+}
+
static unsigned long next_rtc_update;
/*
*/
static inline void do_set_rtc(void)
{
- if (time_status & STA_UNSYNC || set_rtc == NULL)
+ if (!ntp_synced() || set_rtc == NULL)
return;
if (next_rtc_update &&
#ifdef CONFIG_LEDS_TIMER
static inline void do_leds(void)
{
- static unsigned int count = 50;
+ static unsigned int count = HZ/2;
if (--count == 0) {
- count = 50;
+ count = HZ/2;
leds_event(led_timer);
}
}
#define do_leds()
#endif
+#ifndef CONFIG_GENERIC_TIME
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
- unsigned long usec, sec, lost;
+ unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = system_timer->offset();
-
- lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * USECS_PER_JIFFY;
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
* done, and then undo it!
*/
nsec -= system_timer->offset() * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
set_normalized_timespec(&xtime, sec, nsec);
set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
- time_adjust = 0; /* stop active adjtime() */
- time_status |= STA_UNSYNC;
- time_maxerror = NTP_PHASE_LIMIT;
- time_esterror = NTP_PHASE_LIMIT;
+ ntp_clear();
write_sequnlock_irq(&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
+#endif /* !CONFIG_GENERIC_TIME */
/**
* save_time_delta - Save the offset between system time and RTC time
/*
* Kernel system timer support.
*/
-void timer_tick(struct pt_regs *regs)
+void timer_tick(void)
{
- profile_tick(CPU_PROFILING, regs);
+ profile_tick(CPU_PROFILING);
do_leds();
do_set_rtc();
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
- update_process_times(user_mode(regs));
+ update_process_times(user_mode(get_irq_regs()));
#endif
}
.resume = timer_resume,
};
+#ifdef CONFIG_NO_IDLE_HZ
+static int timer_dyn_tick_enable(void)
+{
+ struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
+ unsigned long flags;
+ int ret = -ENODEV;
+
+ if (dyn_tick) {
+ spin_lock_irqsave(&dyn_tick->lock, flags);
+ ret = 0;
+ if (!(dyn_tick->state & DYN_TICK_ENABLED)) {
+ ret = dyn_tick->enable();
+
+ if (ret == 0)
+ dyn_tick->state |= DYN_TICK_ENABLED;
+ }
+ spin_unlock_irqrestore(&dyn_tick->lock, flags);
+ }
+
+ return ret;
+}
+
+static int timer_dyn_tick_disable(void)
+{
+ struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
+ unsigned long flags;
+ int ret = -ENODEV;
+
+ if (dyn_tick) {
+ spin_lock_irqsave(&dyn_tick->lock, flags);
+ ret = 0;
+ if (dyn_tick->state & DYN_TICK_ENABLED) {
+ ret = dyn_tick->disable();
+
+ if (ret == 0)
+ dyn_tick->state &= ~DYN_TICK_ENABLED;
+ }
+ spin_unlock_irqrestore(&dyn_tick->lock, flags);
+ }
+
+ return ret;
+}
+
+/*
+ * Reprogram the system timer for at least the calculated time interval.
+ * This function should be called from the idle thread with IRQs disabled,
+ * immediately before sleeping.
+ */
+void timer_dyn_reprogram(void)
+{
+ struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
+ unsigned long next, seq, flags;
+
+ if (!dyn_tick)
+ return;
+
+ spin_lock_irqsave(&dyn_tick->lock, flags);
+ if (dyn_tick->state & DYN_TICK_ENABLED) {
+ next = next_timer_interrupt();
+ do {
+ seq = read_seqbegin(&xtime_lock);
+ dyn_tick->reprogram(next - jiffies);
+ } while (read_seqretry(&xtime_lock, seq));
+ }
+ spin_unlock_irqrestore(&dyn_tick->lock, flags);
+}
+
+static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)
+{
+ return sprintf(buf, "%i\n",
+ (system_timer->dyn_tick->state & DYN_TICK_ENABLED) >> 1);
+}
+
+static ssize_t timer_set_dyn_tick(struct sys_device *dev, const char *buf,
+ size_t count)
+{
+ unsigned int enable = simple_strtoul(buf, NULL, 2);
+
+ if (enable)
+ timer_dyn_tick_enable();
+ else
+ timer_dyn_tick_disable();
+
+ return count;
+}
+static SYSDEV_ATTR(dyn_tick, 0644, timer_show_dyn_tick, timer_set_dyn_tick);
+
+/*
+ * dyntick=enable|disable
+ */
+static char dyntick_str[4] __initdata = "";
+
+static int __init dyntick_setup(char *str)
+{
+ if (str)
+ strlcpy(dyntick_str, str, sizeof(dyntick_str));
+ return 1;
+}
+
+__setup("dyntick=", dyntick_setup);
+#endif
+
static int __init timer_init_sysfs(void)
{
int ret = sysdev_class_register(&timer_sysclass);
system_timer->dev.cls = &timer_sysclass;
ret = sysdev_register(&system_timer->dev);
}
+
+#ifdef CONFIG_NO_IDLE_HZ
+ if (ret == 0 && system_timer->dyn_tick) {
+ ret = sysdev_create_file(&system_timer->dev, &attr_dyn_tick);
+
+ /*
+ * Turn on dynamic tick after calibrate delay
+ * for correct bogomips
+ */
+ if (ret == 0 && dyntick_str[0] == 'e')
+ ret = timer_dyn_tick_enable();
+ }
+#endif
+
return ret;
}
void __init time_init(void)
{
+#ifndef CONFIG_GENERIC_TIME
if (system_timer->offset == NULL)
system_timer->offset = dummy_gettimeoffset;
+#endif
system_timer->init();
+
+#ifdef CONFIG_NO_IDLE_HZ
+ if (system_timer->dyn_tick)
+ system_timer->dyn_tick->lock = SPIN_LOCK_UNLOCKED;
+#endif
}
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