static enum power_state power_wait_s5_rtc_reset(void)
{
static int s5_exit_tries;
/* Wait for S5 exit and then attempt RTC reset */
while ((power_get_signals() & IN_PCH_SLP_S4_DEASSERTED) == 0) {
/* Handle RSMRST passthru event while waiting */
handle_rsmrst(POWER_S5);
if (task_wait_event(SECOND*4) == TASK_EVENT_TIMER) {
CPRINTS("timeout waiting for S5 exit");
chipset_force_g3();
/* Assert RTCRST# and retry 5 times */
board_rtc_reset();
if (++s5_exit_tries > 4) {
s5_exit_tries = 0;
return POWER_G3; /* Stay off */
}
udelay(10 * MSEC);
return POWER_G3S5; /* Power up again */
}
}
s5_exit_tries = 0;
return POWER_S5S3; /* Power up to next state */
}
/**
* 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");
}
enum power_state power_chipset_init(void)
{
/*
* If we're switching between images without rebooting, see if the x86
* is already powered on; if so, leave it there instead of cycling
* through G3.
*/
if (system_jumped_to_this_image()) {
if ((power_get_signals() & IN_ALL_S0) == IN_ALL_S0) {
/* Disable idle task deep sleep when in S0. */
disable_sleep(SLEEP_MASK_AP_RUN);
CPRINTS("already in S0");
return POWER_S0;
} else {
/* Force all signals to their G3 states */
CPRINTS("forcing G3");
gpio_set_level(GPIO_PCH_PWROK, 0);
gpio_set_level(GPIO_SYS_PWROK, 0);
gpio_set_level(GPIO_PP1050_EN, 0);
gpio_set_level(GPIO_PP1200_EN, 0);
gpio_set_level(GPIO_PP1800_EN, 0);
gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0);
gpio_set_level(GPIO_PP5000_USB_EN, 0);
gpio_set_level(GPIO_PP5000_EN, 0);
gpio_set_level(GPIO_PCH_DPWROK, 0);
gpio_set_level(GPIO_PP3300_DSW_EN, 0);
wireless_set_state(WIRELESS_OFF);
}
}
return POWER_G3;
}
/**
* Check if there has been a power-on event
*
* This checks all power-on event signals and returns non-zero if any have been
* triggered (with debounce taken into account).
*
* @return non-zero if there has been a power-on event, 0 if not.
*/
static int check_for_power_on_event(void)
{
int ap_off_flag;
ap_off_flag = system_get_reset_flags() & RESET_FLAG_AP_OFF;
system_clear_reset_flags(RESET_FLAG_AP_OFF);
/* check if system is already ON */
if (power_get_signals() & IN_POWER_GOOD) {
if (ap_off_flag) {
CPRINTS(
"system is on, but "
"RESET_FLAG_AP_OFF is on");
return 0;
} else {
CPRINTS(
"system is on, thus clear "
"auto_power_on");
/* no need to arrange another power on */
auto_power_on = 0;
return 1;
}
}
/* power on requested at EC startup for recovery */
if (auto_power_on) {
auto_power_on = 0;
return 2;
}
/* Check lid open */
if (lid_opened) {
lid_opened = 0;
return 3;
}
/* check for power button press */
if (power_button_is_pressed())
return 4;
if (power_request == POWER_REQ_ON) {
power_request = POWER_REQ_NONE;
return 5;
}
return 0;
}
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_chipset_init(void)
{
/*
* If we're switching between images without rebooting, see if the x86
* is already powered on; if so, leave it there instead of cycling
* through G3.
*/
if (system_jumped_to_this_image()) {
if ((power_get_signals() & IN_ALL_S0) == IN_ALL_S0) {
/* Disable idle task deep sleep when in S0. */
disable_sleep(SLEEP_MASK_AP_RUN);
CPRINTS("already in S0");
return POWER_S0;
} else {
/* Force all signals to their G3 states */
chipset_force_g3();
}
}
return POWER_G3;
}
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;
}
enum power_state power_handle_state(enum power_state state)
{
switch (state) {
case POWER_G3:
break;
case POWER_S5:
if (gpio_get_level(GPIO_PCH_SLP_S5_L) == 1)
return POWER_S5S3; /* Power up to next state */
break;
case POWER_S3:
/* Check for state transitions */
if (!power_has_signals(IN_PGOOD_S3)) {
/* Required rail went away */
chipset_force_shutdown();
return POWER_S3S5;
} else if (gpio_get_level(GPIO_PCH_SLP_S3_L) == 1) {
/* Power up to next state */
return POWER_S3S0;
} else if (gpio_get_level(GPIO_PCH_SLP_S5_L) == 0) {
/* Power down to next state */
return POWER_S3S5;
}
break;
case POWER_S0:
if (!power_has_signals(IN_PGOOD_S0)) {
/* Required rail went away */
chipset_force_shutdown();
return POWER_S0S3;
} else if (gpio_get_level(GPIO_PCH_SLP_S3_L) == 0) {
/* Power down to next state */
return POWER_S0S3;
}
break;
case POWER_G3S5:
/* Enable 3.3V DSW */
gpio_set_level(GPIO_PP3300_DSW_EN, 1);
/*
* Wait 10ms after +3VALW good, since that powers VccDSW and
* VccSUS.
*/
msleep(10);
/* Enable PP5000 (5V) rail as 1.05V and 1.2V rails need 5V
* rail to regulate properly. */
gpio_set_level(GPIO_PP5000_EN, 1);
/* Wait for PP1050/PP1200 PGOOD to go LOW to
* indicate that PP5000 is stable */
while ((power_get_signals() & IN_PGOOD_PP5000) != 0) {
if (task_wait_event(SECOND) == TASK_EVENT_TIMER) {
CPRINTS("timeout waiting for PP5000");
gpio_set_level(GPIO_PP5000_EN, 0);
chipset_force_shutdown();
return POWER_G3;
}
}
/* Turn on 3.3V DSW gated rail for core regulator */
gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 1);
/* Assert DPWROK */
gpio_set_level(GPIO_PCH_DPWROK, 1);
/* Enable PP1050 rail. */
gpio_set_level(GPIO_PP1050_EN, 1);
/* Wait for 1.05V to come up and CPU to notice */
if (power_wait_signals(IN_PGOOD_PP1050 |
IN_PCH_SLP_SUS_DEASSERTED)) {
gpio_set_level(GPIO_PP1050_EN, 0);
gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0);
gpio_set_level(GPIO_PP5000_EN, 0);
chipset_force_shutdown();
return POWER_G3;
}
/* Wait 5ms for SUSCLK to stabilize */
msleep(5);
/* Call hook to indicate out of G3 state */
hook_notify(HOOK_CHIPSET_PRE_INIT);
return POWER_S5;
case POWER_S5S3:
/* Turn on power to RAM */
gpio_set_level(GPIO_PP1800_EN, 1);
gpio_set_level(GPIO_PP1200_EN, 1);
if (power_wait_signals(IN_PGOOD_S3)) {
gpio_set_level(GPIO_PP1800_EN, 0);
gpio_set_level(GPIO_PP1200_EN, 0);
chipset_force_shutdown();
return POWER_S5;
}
/*
* Take lightbar out of reset, now that +5VALW is
* available and we won't leak +3VALW through the reset
* line.
*/
gpio_set_level(GPIO_LIGHTBAR_RESET_L, 1);
/*
* Enable touchpad power so it can wake the system from
* suspend.
*/
gpio_set_level(GPIO_ENABLE_TOUCHPAD, 1);
/* Turn on USB power rail. */
gpio_set_level(GPIO_PP5000_USB_EN, 1);
/* Call hooks now that rails are up */
hook_notify(HOOK_CHIPSET_STARTUP);
return POWER_S3;
case POWER_S3S0:
/* Wait 20ms before allowing VCCST_PGOOD to rise. */
msleep(20);
/* Enable wireless. */
wireless_set_state(WIRELESS_ON);
/* Make sure the touchscreen is on, too. */
gpio_set_level(GPIO_TOUCHSCREEN_RESET_L, 1);
/* Wait for non-core power rails good */
if (power_wait_signals(IN_PGOOD_S0)) {
chipset_force_shutdown();
wireless_set_state(WIRELESS_OFF);
return POWER_S3;
}
/* Call hooks now that rails are up */
hook_notify(HOOK_CHIPSET_RESUME);
/*
* Disable idle task deep sleep. This means that the low
* power idle task will not go into deep sleep while in S0.
*/
disable_sleep(SLEEP_MASK_AP_RUN);
/* Wait 99ms after all voltages good */
msleep(99);
/*
* Throttle CPU if necessary. This should only be asserted
* when +VCCP is powered (it is by now).
*/
gpio_set_level(GPIO_CPU_PROCHOT, throttle_cpu);
/* Set PCH_PWROK */
gpio_set_level(GPIO_PCH_PWROK, 1);
gpio_set_level(GPIO_SYS_PWROK, 1);
return POWER_S0;
case POWER_S0S3:
/* Call hooks before we remove power rails */
hook_notify(HOOK_CHIPSET_SUSPEND);
/* Clear PCH_PWROK */
gpio_set_level(GPIO_SYS_PWROK, 0);
gpio_set_level(GPIO_PCH_PWROK, 0);
/* Wait 40ns */
udelay(1);
/* Suspend wireless */
wireless_set_state(WIRELESS_SUSPEND);
/*
* Enable idle task deep sleep. Allow the low power idle task
* to go into deep sleep in S3 or lower.
*/
enable_sleep(SLEEP_MASK_AP_RUN);
/*
* Deassert prochot since CPU is off and we're about to drop
* +VCCP.
*/
gpio_set_level(GPIO_CPU_PROCHOT, 0);
return POWER_S3;
case POWER_S3S5:
/* Call hooks before we remove power rails */
hook_notify(HOOK_CHIPSET_SHUTDOWN);
/* Disable wireless */
wireless_set_state(WIRELESS_OFF);
/* Disable peripheral power */
gpio_set_level(GPIO_ENABLE_TOUCHPAD, 0);
gpio_set_level(GPIO_PP5000_USB_EN, 0);
/* Turn off power to RAM */
gpio_set_level(GPIO_PP1800_EN, 0);
gpio_set_level(GPIO_PP1200_EN, 0);
/*
* Put touchscreen and lightbar in reset, so we won't
* leak +3VALW through the reset line to chips powered
* by +5VALW.
*
* (Note that we're no longer powering down +5VALW due
* to crosbug.com/p/16600, but to minimize side effects
* of that change we'll still reset these components in
* S5.)
*/
gpio_set_level(GPIO_TOUCHSCREEN_RESET_L, 0);
gpio_set_level(GPIO_LIGHTBAR_RESET_L, 0);
return pause_in_s5 ? POWER_S5 : POWER_S5G3;
case POWER_S5G3:
/* Deassert DPWROK */
gpio_set_level(GPIO_PCH_DPWROK, 0);
/* Turn off power rails enabled in S5 */
gpio_set_level(GPIO_PP1050_EN, 0);
gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0);
gpio_set_level(GPIO_PP5000_EN, 0);
/* Disable 3.3V DSW */
gpio_set_level(GPIO_PP3300_DSW_EN, 0);
return POWER_G3;
}
return state;
}