/**
* alarmtimer_suspend - Suspend time callback
* @dev: unused
* @state: unused
*
* When we are going into suspend, we look through the bases
* to see which is the soonest timer to expire. We then
* set an rtc timer to fire that far into the future, which
* will wake us from suspend.
*/
static int alarmtimer_suspend(struct device *dev)
{
struct rtc_time tm;
ktime_t min, now;
unsigned long flags;
struct rtc_device *rtc;
int i;
spin_lock_irqsave(&freezer_delta_lock, flags);
min = freezer_delta;
freezer_delta = ktime_set(0, 0);
spin_unlock_irqrestore(&freezer_delta_lock, flags);
rtc = rtcdev;
/* If we have no rtcdev, just return */
if (!rtc)
return 0;
/* Find the soonest timer to expire*/
for (i = 0; i < ALARM_NUMTYPE; i++) {
struct alarm_base *base = &alarm_bases[i];
struct timerqueue_node *next;
ktime_t delta;
spin_lock_irqsave(&base->lock, flags);
next = timerqueue_getnext(&base->timerqueue);
spin_unlock_irqrestore(&base->lock, flags);
if (!next)
continue;
delta = ktime_sub(next->expires, base->gettime());
if (!min.tv64 || (delta.tv64 < min.tv64))
min = delta;
}
if (min.tv64 == 0)
return 0;
/* XXX - Should we enforce a minimum sleep time? */
WARN_ON(min.tv64 < NSEC_PER_SEC);
/* Setup an rtc timer to fire that far in the future */
rtc_timer_cancel(rtc, &rtctimer);
rtc_read_time(rtc, &tm);
now = rtc_tm_to_ktime(tm);
now = ktime_add(now, min);
rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
return 0;
}
/*
* Initialize the real-time clock device.
* In addition, various variables used to support the clock are initialized.
*/
int
rtclock_init(void)
{
uint64_t cycles;
assert(!ml_get_interrupts_enabled());
if (cpu_number() == master_cpu) {
assert(tscFreq);
rtc_set_timescale(tscFreq);
/*
* Adjust and set the exported cpu speed.
*/
cycles = rtc_export_speed(tscFreq);
/*
* Set min/max to actual.
* ACPI may update these later if speed-stepping is detected.
*/
gPEClockFrequencyInfo.cpu_frequency_min_hz = cycles;
gPEClockFrequencyInfo.cpu_frequency_max_hz = cycles;
rtc_timer_init();
clock_timebase_init();
ml_init_lock_timeout();
ml_init_delay_spin_threshold(10);
}
/* Set fixed configuration for lapic timers */
rtc_timer->config();
rtc_timer_start();
return (1);
}
