/**
* Power off the AP
*/
static void power_off(void)
{
unsigned int power_off_timeout = 100; /* ms */
/* Call hooks before we drop power rails */
hook_notify(HOOK_CHIPSET_SHUTDOWN);
/* switch off all rails */
chipset_turn_off_power_rails();
/* Change SUSPEND_L and EC_INT pin to high-Z to reduce power draw. */
gpio_set_flags(GPIO_SUSPEND_L, GPIO_INPUT);
gpio_set_flags(GPIO_EC_INT_L, GPIO_INPUT);
/* Wait till we actually turn off to not mess up the state machine. */
while (power_get_signals() & IN_POWER_GOOD) {
msleep(1);
power_off_timeout--;
ASSERT(power_off_timeout);
}
lid_opened = 0;
enable_sleep(SLEEP_MASK_AP_RUN);
powerled_set_state(POWERLED_STATE_OFF);
CPRINTS("power shutdown complete");
}
void chipset_force_shutdown(void)
{
chipset_turn_off_power_rails();
/* clean-up internal variable */
power_request = POWER_REQ_NONE;
}
/**
* Power off the AP
*/
static void power_off(void)
{
/* Call hooks before we drop power rails */
hook_notify(HOOK_CHIPSET_SHUTDOWN);
/* switch off all rails */
chipset_turn_off_power_rails();
/* Change SUSPEND_L and EC_INT pin to high-Z to reduce power draw. */
gpio_set_flags(GPIO_SUSPEND_L, GPIO_INPUT);
gpio_set_flags(GPIO_EC_INT, GPIO_INPUT);
lid_opened = 0;
enable_sleep(SLEEP_MASK_AP_RUN);
powerled_set_state(POWERLED_STATE_OFF);
CPRINTS("power shutdown complete");
}
enum power_state power_chipset_init(void)
{
int init_power_state;
uint32_t reset_flags = system_get_reset_flags();
/*
* Force the AP shutdown unless we are doing SYSJUMP. Otherwise,
* the AP could stay in strange state.
*/
if (!(reset_flags & RESET_FLAG_SYSJUMP)) {
CPRINTS("not sysjump; forcing AP shutdown");
chipset_turn_off_power_rails();
/*
* The warm reset triggers AP into the RK recovery mode (
* flash SPI from USB).
*/
chipset_reset(0);
init_power_state = POWER_G3;
} else {
/* In the SYSJUMP case, we check if the AP is on */
if (power_get_signals() & IN_POWER_GOOD)
init_power_state = POWER_S0;
else
init_power_state = POWER_G3;
}
/* Leave power off only if requested by reset flags */
if (!(reset_flags & RESET_FLAG_AP_OFF) &&
!(reset_flags & RESET_FLAG_SYSJUMP)) {
CPRINTS("auto_power_on set due to reset_flag 0x%x",
system_get_reset_flags());
auto_power_on = 1;
}
/*
* Some batteries use clock stretching feature, which requires
* more time to be stable. See http://crosbug.com/p/28289
*/
battery_wait_for_stable();
return init_power_state;
}
enum power_state power_handle_state(enum power_state state)
{
int value;
static int boot_from_g3;
switch (state) {
case POWER_G3:
boot_from_g3 = check_for_power_on_event();
if (boot_from_g3)
return POWER_G3S5;
break;
case POWER_G3S5:
return POWER_S5;
case POWER_S5:
if (boot_from_g3) {
value = boot_from_g3;
boot_from_g3 = 0;
} else {
value = check_for_power_on_event();
}
if (value) {
CPRINTS("power on %d", value);
return POWER_S5S3;
}
return state;
case POWER_S5S3:
hook_notify(HOOK_CHIPSET_PRE_INIT);
power_on();
disable_sleep(SLEEP_MASK_AP_RUN);
powerled_set_state(POWERLED_STATE_ON);
if (power_wait_signals(IN_POWER_GOOD) == EC_SUCCESS) {
CPRINTS("POWER_GOOD seen");
if (power_button_wait_for_release(
DELAY_SHUTDOWN_ON_POWER_HOLD) ==
EC_SUCCESS) {
power_button_was_pressed = 0;
set_pmic_pwron(0);
/* setup misc gpio for S3/S0 functionality */
gpio_set_flags(GPIO_SUSPEND_L, GPIO_INPUT
| GPIO_INT_BOTH | GPIO_PULL_DOWN);
gpio_set_flags(GPIO_EC_INT_L, GPIO_OUTPUT
| GPIO_OUT_HIGH);
/* Call hooks now that AP is running */
hook_notify(HOOK_CHIPSET_STARTUP);
return POWER_S3;
} else {
CPRINTS("long-press button, shutdown");
power_off();
/*
* Since the AP may be up already, return S0S3
* state to go through the suspend hook.
*/
return POWER_S0S3;
}
} else {
CPRINTS("POWER_GOOD not seen in time");
}
chipset_turn_off_power_rails();
return POWER_S5;
case POWER_S3:
if (!(power_get_signals() & IN_POWER_GOOD))
return POWER_S3S5;
else if (!(power_get_signals() & IN_SUSPEND))
return POWER_S3S0;
return state;
case POWER_S3S0:
powerled_set_state(POWERLED_STATE_ON);
hook_notify(HOOK_CHIPSET_RESUME);
return POWER_S0;
case POWER_S0:
value = check_for_power_off_event();
if (value) {
CPRINTS("power off %d", value);
power_off();
return POWER_S0S3;
} else if (power_get_signals() & IN_SUSPEND)
return POWER_S0S3;
return state;
case POWER_S0S3:
if (lid_is_open())
powerled_set_state(POWERLED_STATE_SUSPEND);
else
powerled_set_state(POWERLED_STATE_OFF);
/* Call hooks here since we don't know it prior to AP suspend */
hook_notify(HOOK_CHIPSET_SUSPEND);
return POWER_S3;
case POWER_S3S5:
power_button_wait_for_release(-1);
power_button_was_pressed = 0;
return POWER_S5;
case POWER_S5G3:
return POWER_G3;
}
return state;
}
