/**
* @brief Place system timer into idle state.
*
* Re-program the timer to enter into the idle state for the given number of
* sys ticks, counted from the previous sys tick. The timer will fire in the
* number of sys ticks supplied or the maximum number of sys ticks (converted
* to RTC ticks) that can be programmed into the hardware.
*
* This will only be called from idle context, with IRQs disabled.
*
* A value of -1 will result in the maximum number of sys ticks.
*
* Example 1: Idle sleep is entered:
*
* sys tick timeline: (1) (2) (3) (4) (5) (6)
* rtc tick timeline : 0----100----200----300----400----500----600
* ******************
* 150
*
* a) The last sys tick was announced at 100
* b) The idle context enters sleep at 150, between sys tick 1 and 2, with
* sys_ticks = 3.
* c) The RTC is programmed to fire at sys tick 1 + 3 = 4 (RTC tick 400)
*
* @return N/A
*/
void _timer_idle_enter(s32_t sys_ticks)
{
#ifdef CONFIG_TICKLESS_KERNEL
if (sys_ticks != K_FOREVER) {
/* Need to reprograme timer if current program is smaller*/
if (sys_ticks > expected_sys_ticks) {
_set_time(sys_ticks);
}
} else {
expected_sys_ticks = 0;
/* Set time to largest possile RTC Tick*/
_set_time(_get_max_clock_time());
}
#else
/* Restrict ticks to max supported by RTC without risking overflow*/
if ((sys_ticks < 0) ||
(sys_ticks > (RTC_HALF / sys_clock_hw_cycles_per_tick))) {
sys_ticks = RTC_HALF / sys_clock_hw_cycles_per_tick;
}
expected_sys_ticks = sys_ticks;
/* If ticks is 0, the RTC interrupt handler will be set pending
* immediately, meaning that we will not go to sleep.
*/
rtc_compare_set(rtc_past + (sys_ticks * sys_clock_hw_cycles_per_tick));
#endif
}
/**
*
* @brief Place the system timer into idle state
*
* Re-program the timer to enter into the idle state for the given number of
* ticks. It is set to a "one shot" mode where it will fire in the number of
* ticks supplied or the maximum number of ticks that can be programmed into
* hardware. A value of -1 will result in the maximum number of ticks.
*
* @return N/A
*/
void _timer_idle_enter(s32_t ticks /* system ticks */
)
{
#ifdef CONFIG_TICKLESS_KERNEL
if (ticks != K_FOREVER) {
/* Need to reprogram only if current program is smaller */
if (ticks > idle_original_ticks) {
_set_time(ticks);
}
} else {
sysTickStop();
idle_original_ticks = 0;
}
idle_mode = IDLE_TICKLESS;
#else
sysTickStop();
/*
* We're being asked to have the timer fire in "ticks" from now. To
* maintain accuracy we must account for the remaining time left in the
* timer. So we read the count out of it and add it to the requested
* time out
*/
idle_original_count = sysTickCurrentGet() - timer_idle_skew;
if ((ticks == -1) || (ticks > max_system_ticks)) {
/*
* We've been asked to fire the timer so far in the future that
* the required count value would not fit in the 24-bit reload
* register.
* Instead, we program for the maximum programmable interval
* minus one system tick to prevent overflow when the left over
* count read earlier is added.
*/
idle_original_count += max_load_value - default_load_value;
idle_original_ticks = max_system_ticks - 1;
} else {
/*
* leave one tick of buffer to have to time react when coming
* back
*/
idle_original_ticks = ticks - 1;
idle_original_count += idle_original_ticks * default_load_value;
}
/*
* Set timer to virtual "one shot" mode - sysTick does not have multiple
* modes, so the reload value is simply changed.
*/
timer_mode = TIMER_MODE_ONE_SHOT;
idle_mode = IDLE_TICKLESS;
sysTickReloadSet(idle_original_count);
sysTickStart();
#endif
}
gboolean
gsd_datetime_mechanism_set_time (GsdDatetimeMechanism *mechanism,
gint64 seconds_since_epoch,
DBusGMethodInvocation *context)
{
struct timeval tv;
reset_killtimer ();
g_debug ("SetTime(%" G_GINT64_FORMAT ") called", seconds_since_epoch);
tv.tv_sec = (time_t) seconds_since_epoch;
tv.tv_usec = 0;
return _set_time (mechanism, &tv, context);
}
gboolean
gnome_clock_applet_mechanism_set_time (GnomeClockAppletMechanism *mechanism,
gint64 seconds_since_epoch,
DBusGMethodInvocation *context)
{
struct timeval tv;
reset_killtimer ();
g_debug ("SetTime(%lld) called", seconds_since_epoch);
tv.tv_sec = (time_t) seconds_since_epoch;
tv.tv_usec = 0;
return _set_time (mechanism, &tv, context);
}
void _timer_idle_enter(s32_t ticks)
{
#ifdef CONFIG_TICKLESS_KERNEL
if (ticks != K_FOREVER) {
/* Need to reprogram only if current program is smaller */
if (ticks > programmed_ticks) {
_set_time(ticks);
}
} else {
programmed_ticks = 0;
timer0_control_register_set(timer0_control_register_get() &
~_ARC_V2_TMR_CTRL_IE);
}
#else
u32_t status;
if ((ticks == K_FOREVER) || (ticks > max_system_ticks)) {
/*
* The number of cycles until the timer must fire next might not fit
* in the 32-bit counter register. To work around this, program
* the counter to fire in the maximum number of ticks.
*/
ticks = max_system_ticks;
}
programmed_ticks = ticks;
programmed_limit = (programmed_ticks * cycles_per_tick) - 1;
timer0_limit_register_set(programmed_limit);
/*
* If Timer0's IP bit is set, then it is known that we have straddled
* a tick boundary while entering tickless idle.
*/
status = timer0_control_register_get();
if (status & _ARC_V2_TMR_CTRL_IP) {
straddled_tick_on_idle_enter = 1;
}
__ASSERT_EVAL({},
u32_t timer_count = timer0_count_register_get(),
timer_count <= programmed_limit,
"timer_count: %d, limit %d\n", timer_count, programmed_limit);
#endif
}
/**
*
* @brief Handling of tickless idle when interrupted
*
* The function will be called by _sys_power_save_idle_exit(), called from
* _arch_isr_direct_pm() for 'direct' interrupts, or from _isr_wrapper for
* regular ones, which is called on every IRQ handler if the device was
* idle, and optionally called when a 'direct' IRQ handler executes if the
* device was idle.
*
* Example 1: Idle sleep is interrupted before time:
*
* sys tick timeline: (1) (2) (3) (4) (5) (6)
* rtc tick timeline : 0----100----200----300----400----500----600
* **************!***
* 150 350
*
* Assume that _timer_idle_enter() is called at 150 (1) to sleep for 3
* sys ticks. The last sys tick was announced at 100.
*
* On wakeup (non-RTC IRQ at 350):
*
* a) Notify how many sys ticks have passed, i.e., 350 - 150 / 100 = 2.
* b) Schedule next sys tick at 400.
*
*/
void _timer_idle_exit(void)
{
#ifdef CONFIG_TICKLESS_KERNEL
if (!expected_sys_ticks && _sys_clock_always_on) {
_set_time(_get_max_clock_time());
}
#else
/* Clear the event flag and interrupt in case we woke up on the RTC
* interrupt. No need to run the RTC ISR since everything that needs
* to run in the ISR will be done in this call.
*/
RTC_CC_EVENT = 0;
NVIC_ClearPendingIRQ(NRF5_IRQ_RTC1_IRQn);
rtc_announce_set_next();
/* After exiting idle, the kernel no longer expects more than one sys
* ticks to have passed when _sys_clock_tick_announce() is called.
*/
expected_sys_ticks = 1;
#endif
}
gboolean
gsd_datetime_mechanism_adjust_time (GsdDatetimeMechanism *mechanism,
gint64 seconds_to_add,
DBusGMethodInvocation *context)
{
struct timeval tv;
reset_killtimer ();
g_debug ("AdjustTime(%" G_GINT64_FORMAT " ) called", seconds_to_add);
if (gettimeofday (&tv, NULL) != 0) {
GError *error;
error = g_error_new (GSD_DATETIME_MECHANISM_ERROR,
GSD_DATETIME_MECHANISM_ERROR_GENERAL,
"Error calling gettimeofday(): %s", strerror (errno));
dbus_g_method_return_error (context, error);
g_error_free (error);
return FALSE;
}
tv.tv_sec += (time_t) seconds_to_add;
return _set_time (mechanism, &tv, context);
}
gboolean
gnome_clock_applet_mechanism_adjust_time (GnomeClockAppletMechanism *mechanism,
gint64 seconds_to_add,
DBusGMethodInvocation *context)
{
struct timeval tv;
reset_killtimer ();
g_debug ("AdjustTime(%lld) called", seconds_to_add);
if (gettimeofday (&tv, NULL) != 0) {
GError *error;
error = g_error_new (GNOME_CLOCK_APPLET_MECHANISM_ERROR,
GNOME_CLOCK_APPLET_MECHANISM_ERROR_GENERAL,
"Error calling gettimeofday(): %s", strerror (errno));
dbus_g_method_return_error (context, error);
g_error_free (error);
return FALSE;
}
tv.tv_sec += (time_t) seconds_to_add;
return _set_time (mechanism, &tv, context);
}
