*
* This file contains the ARM-specific time handling details:
* reading the RTC at bootup, etc...
- *
- * 1994-07-02 Alan Modra
- * fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
- * 1998-12-20 Updated NTP code according to technical memorandum Jan '96
- * "A Kernel Model for Precision Timekeeping" by Dave Mills
*/
#include <linux/module.h>
#include <linux/kernel.h>
EXPORT_SYMBOL(profile_pc);
#endif
-/*
- * hook for setting the RTC's idea of the current time.
- */
-int (*set_rtc)(void);
-
-#ifndef CONFIG_GENERIC_TIME
-static unsigned long dummy_gettimeoffset(void)
-{
- return 0;
-}
-#endif
-
-static unsigned long next_rtc_update;
-
-/*
- * If we have an externally synchronized linux clock, then update
- * CMOS clock accordingly every ~11 minutes. set_rtc() has to be
- * called as close as possible to 500 ms before the new second
- * starts.
- */
-static inline void do_set_rtc(void)
-{
- if (!ntp_synced() || set_rtc == NULL)
- return;
-
- if (next_rtc_update &&
- time_before((unsigned long)xtime.tv_sec, next_rtc_update))
- return;
-
- if (xtime.tv_nsec < 500000000 - ((unsigned) tick_nsec >> 1) &&
- xtime.tv_nsec >= 500000000 + ((unsigned) tick_nsec >> 1))
- return;
-
- if (set_rtc())
- /*
- * rtc update failed. Try again in 60s
- */
- next_rtc_update = xtime.tv_sec + 60;
- else
- next_rtc_update = xtime.tv_sec + 660;
-}
-
-#ifdef CONFIG_LEDS
-
-static void dummy_leds_event(led_event_t evt)
-{
-}
-
-void (*leds_event)(led_event_t) = dummy_leds_event;
-
-struct leds_evt_name {
- const char name[8];
- int on;
- int off;
-};
-
-static const struct leds_evt_name evt_names[] = {
- { "amber", led_amber_on, led_amber_off },
- { "blue", led_blue_on, led_blue_off },
- { "green", led_green_on, led_green_off },
- { "red", led_red_on, led_red_off },
-};
-
-static ssize_t leds_store(struct sys_device *dev,
- struct sysdev_attribute *attr,
- const char *buf, size_t size)
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+u32 arch_gettimeoffset(void)
{
- int ret = -EINVAL, len = strcspn(buf, " ");
-
- if (len > 0 && buf[len] == '\0')
- len--;
-
- if (strncmp(buf, "claim", len) == 0) {
- leds_event(led_claim);
- ret = size;
- } else if (strncmp(buf, "release", len) == 0) {
- leds_event(led_release);
- ret = size;
- } else {
- int i;
-
- for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
- if (strlen(evt_names[i].name) != len ||
- strncmp(buf, evt_names[i].name, len) != 0)
- continue;
- if (strncmp(buf+len, " on", 3) == 0) {
- leds_event(evt_names[i].on);
- ret = size;
- } else if (strncmp(buf+len, " off", 4) == 0) {
- leds_event(evt_names[i].off);
- ret = size;
- }
- break;
- }
- }
- return ret;
-}
-
-static SYSDEV_ATTR(event, 0200, NULL, leds_store);
-
-static int leds_suspend(struct sys_device *dev, pm_message_t state)
-{
- leds_event(led_stop);
- return 0;
-}
-
-static int leds_resume(struct sys_device *dev)
-{
- leds_event(led_start);
- return 0;
-}
+ if (system_timer->offset != NULL)
+ return system_timer->offset() * 1000;
-static int leds_shutdown(struct sys_device *dev)
-{
- leds_event(led_halted);
return 0;
}
-
-static struct sysdev_class leds_sysclass = {
- .name = "leds",
- .shutdown = leds_shutdown,
- .suspend = leds_suspend,
- .resume = leds_resume,
-};
-
-static struct sys_device leds_device = {
- .id = 0,
- .cls = &leds_sysclass,
-};
-
-static int __init leds_init(void)
-{
- int ret;
- ret = sysdev_class_register(&leds_sysclass);
- if (ret == 0)
- ret = sysdev_register(&leds_device);
- if (ret == 0)
- ret = sysdev_create_file(&leds_device, &attr_event);
- return ret;
-}
-
-device_initcall(leds_init);
-
-EXPORT_SYMBOL(leds_event);
-#endif
+#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
#ifdef CONFIG_LEDS_TIMER
static inline void do_leds(void)
#define do_leds()
#endif
-#ifndef CONFIG_GENERIC_TIME
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
-
- do {
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = system_timer->offset();
- sec = xtime.tv_sec;
- usec += xtime.tv_nsec / 1000;
- } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- /* usec may have gone up a lot: be safe */
- while (usec >= 1000000) {
- usec -= 1000000;
- sec++;
- }
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
-int do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- write_seqlock_irq(&xtime_lock);
- /*
- * This is revolting. We need to set "xtime" correctly. However, the
- * value in this location is the value at the most recent update of
- * wall time. Discover what correction gettimeofday() would have
- * done, and then undo it!
- */
- nsec -= system_timer->offset() * NSEC_PER_USEC;
-
- 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);
-
- 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
- * @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);
#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
{
profile_tick(CPU_PROFILING);
do_leds();
- do_set_rtc();
write_seqlock(&xtime_lock);
do_timer(1);
write_sequnlock(&xtime_lock);
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_HAVE_SCHED_CLOCK
sched_clock_postinit();
projects / firefly-linux-kernel-4.4.55.git / blobdiff