| /* Copyright 2019 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* |
| * SC7180 SoC power sequencing module for Chrome EC |
| * |
| * This implements the following features: |
| * |
| * - Cold reset powers on the AP |
| * |
| * When powered off: |
| * - Press power button turns on the AP |
| * - Hold power button turns on the AP, and then 8s later turns it off and |
| * leaves it off until pwron is released and pressed again |
| * - Lid open turns on the AP |
| * |
| * When powered on: |
| * - Holding power button for 8s powers off the AP |
| * - Pressing and releasing pwron within that 8s is ignored |
| * - If POWER_GOOD is dropped by the AP, then we power the AP off |
| */ |
| |
| #include "charge_state.h" |
| #include "chipset.h" |
| #include "common.h" |
| #include "gpio.h" |
| #include "hooks.h" |
| #include "lid_switch.h" |
| #include "power.h" |
| #include "power_button.h" |
| #include "system.h" |
| #include "task.h" |
| #include "util.h" |
| |
| #define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args) |
| |
| /* Masks for power signals */ |
| #define IN_POWER_GOOD POWER_SIGNAL_MASK(SC7180_POWER_GOOD) |
| #define IN_AP_RST_ASSERTED POWER_SIGNAL_MASK(SC7180_AP_RST_ASSERTED) |
| |
| |
| /* Long power key press to force shutdown */ |
| #define DELAY_FORCE_SHUTDOWN (8 * SECOND) |
| |
| /* |
| * If the power button is pressed to turn on, then held for this long, we |
| * power off. |
| * |
| * Normal case: User releases power button and chipset_task() goes |
| * into the inner loop, waiting for next event to occur (power button |
| * press or POWER_GOOD == 0). |
| */ |
| #define DELAY_SHUTDOWN_ON_POWER_HOLD (8 * SECOND) |
| |
| /* |
| * After trigger PMIC power sequence, how long it triggers AP to turn on |
| * or off. Observed that the worst case is ~150ms. Pick a safe vale. |
| */ |
| #define PMIC_POWER_AP_RESPONSE_TIMEOUT (350 * MSEC) |
| |
| /* |
| * After force off the switch cap, how long the PMIC/AP totally off. |
| * Observed that the worst case is 2s. Pick a safe vale. |
| */ |
| #define FORCE_OFF_RESPONSE_TIMEOUT (4 * SECOND) |
| |
| /* Wait for polling the AP on signal */ |
| #define PMIC_POWER_AP_WAIT (1 * MSEC) |
| |
| /* The length of an issued low pulse to the PM845_RESIN_L signal */ |
| #define PMIC_RESIN_PULSE_LENGTH (20 * MSEC) |
| |
| /* The timeout of the check if the system can boot AP */ |
| #define CAN_BOOT_AP_CHECK_TIMEOUT (500 * MSEC) |
| |
| /* Wait for polling if the system can boot AP */ |
| #define CAN_BOOT_AP_CHECK_WAIT (100 * MSEC) |
| |
| /* The timeout of the check if the switchcap outputs good voltage */ |
| #define SWITCHCAP_PG_CHECK_TIMEOUT (50 * MSEC) |
| |
| /* Wait for polling if the switchcap outputs good voltage */ |
| #define SWITCHCAP_PG_CHECK_WAIT (5 * MSEC) |
| |
| /* Delay between power-on the system and power-on the PMIC */ |
| #define SYSTEM_POWER_ON_DELAY (10 * MSEC) |
| |
| /* TODO(crosbug.com/p/25047): move to HOOK_POWER_BUTTON_CHANGE */ |
| /* 1 if the power button was pressed last time we checked */ |
| static char power_button_was_pressed; |
| |
| /* 1 if lid-open event has been detected */ |
| static char lid_opened; |
| |
| /* 1 if AP_RST_L and PS_HOLD is overdriven by EC */ |
| static char ap_rst_overdriven; |
| |
| /* Time where we will power off, if power button still held down */ |
| static timestamp_t power_off_deadline; |
| |
| /* Force AP power on (used for recovery keypress) */ |
| static int auto_power_on; |
| |
| enum power_request_t { |
| POWER_REQ_NONE, |
| POWER_REQ_OFF, |
| POWER_REQ_ON, |
| POWER_REQ_RESET, |
| |
| POWER_REQ_COUNT, |
| }; |
| |
| static enum power_request_t power_request; |
| |
| /** |
| * Return values for check_for_power_off_event(). |
| */ |
| enum power_off_event_t { |
| POWER_OFF_CANCEL, |
| POWER_OFF_BY_POWER_BUTTON_PRESSED, |
| POWER_OFF_BY_LONG_PRESS, |
| POWER_OFF_BY_POWER_GOOD_LOST, |
| POWER_OFF_BY_POWER_REQ_OFF, |
| POWER_OFF_BY_POWER_REQ_RESET, |
| |
| POWER_OFF_EVENT_COUNT, |
| }; |
| |
| /** |
| * Return values for check_for_power_on_event(). |
| */ |
| enum power_on_event_t { |
| POWER_ON_CANCEL, |
| POWER_ON_BY_IN_POWER_GOOD, |
| POWER_ON_BY_AUTO_POWER_ON, |
| POWER_ON_BY_LID_OPEN, |
| POWER_ON_BY_POWER_BUTTON_PRESSED, |
| POWER_ON_BY_POWER_REQ_ON, |
| POWER_ON_BY_POWER_REQ_RESET, |
| |
| POWER_ON_EVENT_COUNT, |
| }; |
| |
| /* Issue a request to initiate a reset sequence */ |
| static void request_cold_reset(void) |
| { |
| power_request = POWER_REQ_RESET; |
| task_wake(TASK_ID_CHIPSET); |
| } |
| |
| /* AP-requested reset GPIO interrupt handlers */ |
| static void chipset_reset_request_handler(void) |
| { |
| CPRINTS("AP wants reset"); |
| chipset_reset(CHIPSET_RESET_AP_REQ); |
| } |
| DECLARE_DEFERRED(chipset_reset_request_handler); |
| |
| void chipset_reset_request_interrupt(enum gpio_signal signal) |
| { |
| hook_call_deferred(&chipset_reset_request_handler_data, 0); |
| } |
| |
| void chipset_warm_reset_interrupt(enum gpio_signal signal) |
| { |
| /* |
| * The warm_reset signal is pulled-up by a rail from PMIC. If the |
| * warm_reset drops, it means: |
| * * Servo or Cr50 holds the signal, or |
| * * its pull-up rail POWER_GOOD drops. |
| */ |
| if (!gpio_get_level(GPIO_WARM_RESET_L)) { |
| if (gpio_get_level(GPIO_POWER_GOOD)) { |
| /* |
| * Servo or Cr50 holds the WARM_RESET_L signal. |
| * |
| * Overdrive AP_RST_L to hold AP. Overdrive PS_HOLD to |
| * emulate AP being up to trick the PMIC into thinking |
| * there’s nothing weird going on. |
| */ |
| ap_rst_overdriven = 1; |
| gpio_set_flags(GPIO_PS_HOLD, GPIO_INT_BOTH | |
| GPIO_SEL_1P8V | GPIO_OUT_HIGH); |
| gpio_set_flags(GPIO_AP_RST_L, GPIO_INT_BOTH | |
| GPIO_SEL_1P8V | GPIO_OUT_LOW); |
| } else { |
| /* |
| * The pull-up rail POWER_GOOD drops. |
| * |
| * High-Z both AP_RST_L and PS_HOLD to restore their |
| * states. |
| */ |
| gpio_set_flags(GPIO_AP_RST_L, GPIO_INT_BOTH | |
| GPIO_SEL_1P8V); |
| gpio_set_flags(GPIO_PS_HOLD, GPIO_INT_BOTH | |
| GPIO_SEL_1P8V); |
| ap_rst_overdriven = 0; |
| } |
| } else { |
| if (ap_rst_overdriven) { |
| /* |
| * Servo or Cr50 releases the WARM_RESET_L signal. |
| * |
| * Cold reset the PMIC, doing S0->S5->S0 transition, |
| * by issuing a request to initiate a reset sequence, |
| * to recover the system. The transition to S5 makes |
| * POWER_GOOD drop that triggers an interrupt to |
| * high-Z both AP_RST_L and PS_HOLD. |
| */ |
| request_cold_reset(); |
| } |
| /* If not overdriven, just a normal power-up, do nothing. */ |
| } |
| |
| power_signal_interrupt(signal); |
| } |
| |
| static void sc7180_lid_event(void) |
| { |
| /* Power task only cares about lid-open events */ |
| if (!lid_is_open()) |
| return; |
| |
| lid_opened = 1; |
| task_wake(TASK_ID_CHIPSET); |
| } |
| DECLARE_HOOK(HOOK_LID_CHANGE, sc7180_lid_event, HOOK_PRIO_DEFAULT); |
| |
| static void sc7180_powerbtn_changed(void) |
| { |
| task_wake(TASK_ID_CHIPSET); |
| } |
| DECLARE_HOOK(HOOK_POWER_BUTTON_CHANGE, sc7180_powerbtn_changed, |
| HOOK_PRIO_DEFAULT); |
| |
| /** |
| * Wait the switchcap GPIO0 PVC_PG signal asserted. |
| * |
| * When the output voltage is over the threshold PVC_PG_ADJ, |
| * the PVC_PG is asserted. |
| * |
| * PVG_PG_ADJ is configured to 3.0V. |
| * GPIO0 is configured as PVC_PG. |
| * |
| * @param enable 1 to wait the PMIC/AP on. |
| 0 to wait the PMIC/AP off. |
| */ |
| static void wait_switchcap_power_good(int enable) |
| { |
| timestamp_t poll_deadline; |
| |
| poll_deadline = get_time(); |
| poll_deadline.val += SWITCHCAP_PG_CHECK_TIMEOUT; |
| while (enable != gpio_get_level(GPIO_DA9313_GPIO0) && |
| get_time().val < poll_deadline.val) { |
| usleep(SWITCHCAP_PG_CHECK_WAIT); |
| } |
| |
| /* |
| * Check the timeout case. Just show a message. More check later |
| * will switch the power state. |
| */ |
| if (enable != gpio_get_level(GPIO_DA9313_GPIO0)) { |
| if (enable) |
| CPRINTS("SWITCHCAP NO POWER GOOD!"); |
| else |
| CPRINTS("SWITCHCAP STILL POWER GOOD!"); |
| } |
| |
| } |
| |
| /** |
| * Get the state of the system power signals. |
| * |
| * @return 1 if the system is powered, 0 if not |
| */ |
| static int is_system_powered(void) |
| { |
| return gpio_get_level(GPIO_SWITCHCAP_ON); |
| } |
| |
| /** |
| * Get the PMIC/AP power signal. |
| * |
| * We treat the PMIC chips and the AP as a whole here. Don't deal with |
| * the individual chip. |
| * |
| * @return 1 if the PMIC/AP is powered, 0 if not |
| */ |
| static int is_pmic_pwron(void) |
| { |
| /* Use POWER_GOOD to indicate PMIC/AP is on/off */ |
| return gpio_get_level(GPIO_POWER_GOOD); |
| } |
| |
| /** |
| * Wait the PMIC/AP power-on state. |
| * |
| * @param enable 1 to wait the PMIC/AP on. |
| 0 to wait the PMIC/AP off. |
| * @param timeout Number of microsecond of timeout. |
| */ |
| static void wait_pmic_pwron(int enable, unsigned int timeout) |
| { |
| timestamp_t poll_deadline; |
| |
| /* Check the AP power status */ |
| if (enable == is_pmic_pwron()) |
| return; |
| |
| poll_deadline = get_time(); |
| poll_deadline.val += timeout; |
| while (enable != is_pmic_pwron() && |
| get_time().val < poll_deadline.val) { |
| usleep(PMIC_POWER_AP_WAIT); |
| } |
| |
| /* Check the timeout case */ |
| if (enable != is_pmic_pwron()) { |
| if (enable) |
| CPRINTS("AP POWER NOT READY!"); |
| else |
| CPRINTS("AP POWER STILL UP!"); |
| } |
| } |
| |
| /** |
| * Set the state of the system power signals. |
| * |
| * The system power signals are the enable pins of SwitchCap and VBOB. |
| * They control the power of the set of PMIC chips and the AP. |
| * |
| * @param enable 1 to enable or 0 to disable |
| */ |
| static void set_system_power(int enable) |
| { |
| CPRINTS("%s(%d)", __func__, enable); |
| gpio_set_level(GPIO_SWITCHCAP_ON, enable); |
| wait_switchcap_power_good(enable); |
| /* TODO: VBOB_EN GPIO is NC, just a backup. Remove it later. */ |
| gpio_set_level(GPIO_VBOB_EN, enable); |
| if (enable) { |
| usleep(SYSTEM_POWER_ON_DELAY); |
| } else { |
| /* Ensure POWER_GOOD drop to low if it is a forced shutdown */ |
| wait_pmic_pwron(0, FORCE_OFF_RESPONSE_TIMEOUT); |
| } |
| } |
| |
| /** |
| * Set the PMIC/AP power-on state. |
| * |
| * It triggers the PMIC/AP power-on and power-off sequence. |
| * |
| * @param enable 1 to power the PMIC/AP on. |
| 0 to power the PMIC/AP off. |
| */ |
| static void set_pmic_pwron(int enable) |
| { |
| CPRINTS("%s(%d)", __func__, enable); |
| |
| /* Check the PMIC/AP power state */ |
| if (enable == is_pmic_pwron()) |
| return; |
| |
| /* |
| * Power-on sequence: |
| * 1. Hold down PMIC_KPD_PWR_ODL, which is a power-on trigger |
| * 2. PMIC supplies power to POWER_GOOD |
| * 3. Release PMIC_KPD_PWR_ODL |
| * |
| * Power-off sequence: |
| * 1. Hold down PMIC_KPD_PWR_ODL and PM845_RESIN_L, which is a power-off |
| * trigger (requiring reprogramming PMIC registers to make |
| * PMIC_KPD_PWR_ODL + PM845_RESIN_L as a shutdown trigger) |
| * 2. PMIC stops supplying power to POWER_GOOD (requiring |
| * reprogramming PMIC to set the stage-1 and stage-2 reset timers to |
| * 0 such that the pull down happens just after the deboucing time |
| * of the trigger, like 2ms) |
| * 3. Release PMIC_KPD_PWR_ODL and PM845_RESIN_L |
| * |
| * If the above PMIC registers not programmed or programmed wrong, it |
| * falls back to the next functions, which cuts off the system power. |
| */ |
| |
| gpio_set_level(GPIO_PMIC_KPD_PWR_ODL, 0); |
| if (!enable) |
| gpio_set_level(GPIO_PM845_RESIN_L, 0); |
| wait_pmic_pwron(enable, PMIC_POWER_AP_RESPONSE_TIMEOUT); |
| gpio_set_level(GPIO_PMIC_KPD_PWR_ODL, 1); |
| if (!enable) |
| gpio_set_level(GPIO_PM845_RESIN_L, 1); |
| } |
| |
| enum power_state power_chipset_init(void) |
| { |
| int init_power_state; |
| uint32_t reset_flags = system_get_reset_flags(); |
| |
| /* Enable interrupts */ |
| gpio_enable_interrupt(GPIO_AP_RST_REQ); |
| gpio_enable_interrupt(GPIO_WARM_RESET_L); |
| gpio_enable_interrupt(GPIO_POWER_GOOD); |
| |
| /* |
| * Force the AP shutdown unless we are doing SYSJUMP. Otherwise, |
| * the AP could stay in strange state. |
| */ |
| if (!(reset_flags & EC_RESET_FLAG_SYSJUMP)) { |
| CPRINTS("not sysjump; forcing system shutdown"); |
| set_system_power(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) { |
| CPRINTS("SOC ON"); |
| init_power_state = POWER_S0; |
| } else { |
| CPRINTS("SOC OFF"); |
| init_power_state = POWER_G3; |
| } |
| } |
| |
| /* Leave power off only if requested by reset flags */ |
| if (!(reset_flags & EC_RESET_FLAG_AP_OFF) && |
| !(reset_flags & EC_RESET_FLAG_SYSJUMP)) { |
| CPRINTS("auto_power_on set due to reset_flag 0x%x", |
| system_get_reset_flags()); |
| auto_power_on = 1; |
| } |
| |
| if (battery_is_present() == BP_YES) { |
| /* |
| * (crosbug.com/p/28289): Wait battery stable. |
| * Some batteries use clock stretching feature, which requires |
| * more time to be stable. |
| */ |
| battery_wait_for_stable(); |
| } |
| |
| return init_power_state; |
| } |
| |
| /*****************************************************************************/ |
| |
| /** |
| * Power off the AP |
| */ |
| static void power_off(void) |
| { |
| /* Check the power off status */ |
| if (!is_system_powered()) |
| return; |
| |
| /* Call hooks before we drop power rails */ |
| hook_notify(HOOK_CHIPSET_SHUTDOWN); |
| |
| /* Do a graceful way to shutdown PMIC/AP first */ |
| set_pmic_pwron(0); |
| |
| /* Disable signal interrupts, as they are floating when switchcap off */ |
| power_signal_disable_interrupt(GPIO_AP_RST_L); |
| power_signal_disable_interrupt(GPIO_PMIC_FAULT_L); |
| |
| /* Force to switch off all rails */ |
| set_system_power(0); |
| |
| /* Turn off the 3.3V and 5V rails. */ |
| gpio_set_level(GPIO_EN_PP3300_A, 0); |
| #ifdef CONFIG_POWER_PP5000_CONTROL |
| power_5v_enable(task_get_current(), 0); |
| #else /* !defined(CONFIG_POWER_PP5000_CONTROL) */ |
| gpio_set_level(GPIO_EN_PP5000, 0); |
| #endif /* defined(CONFIG_POWER_PP5000_CONTROL) */ |
| |
| lid_opened = 0; |
| enable_sleep(SLEEP_MASK_AP_RUN); |
| CPRINTS("power shutdown complete"); |
| } |
| |
| /** |
| * Check if the power is enough to boot the AP. |
| */ |
| static int power_is_enough(void) |
| { |
| timestamp_t poll_deadline; |
| |
| /* If powered by adapter only, wait a while for PD negoiation. */ |
| poll_deadline = get_time(); |
| poll_deadline.val += CAN_BOOT_AP_CHECK_TIMEOUT; |
| |
| /* |
| * Wait for PD negotiation. If a system with drained battery, don't |
| * waste the time and exit the loop. |
| */ |
| while (!system_can_boot_ap() && !charge_want_shutdown() && |
| get_time().val < poll_deadline.val) { |
| usleep(CAN_BOOT_AP_CHECK_WAIT); |
| } |
| |
| return system_can_boot_ap() && !charge_want_shutdown(); |
| } |
| |
| /** |
| * Power on the AP |
| */ |
| static void power_on(void) |
| { |
| /* |
| * If no enough power, return and the state machine will transition |
| * back to S5. |
| */ |
| if (!power_is_enough()) |
| return; |
| |
| /* |
| * When power_on() is called, we are at S5S3. Initialize components |
| * to ready state before AP is up. |
| */ |
| hook_notify(HOOK_CHIPSET_PRE_INIT); |
| |
| /* Enable the 3.3V and 5V rail. */ |
| gpio_set_level(GPIO_EN_PP3300_A, 1); |
| #ifdef CONFIG_POWER_PP5000_CONTROL |
| power_5v_enable(task_get_current(), 1); |
| #else /* !defined(CONFIG_POWER_PP5000_CONTROL) */ |
| gpio_set_level(GPIO_EN_PP5000, 1); |
| #endif /* defined(CONFIG_POWER_PP5000_CONTROL) */ |
| |
| set_system_power(1); |
| |
| /* Enable signal interrupts */ |
| power_signal_enable_interrupt(GPIO_AP_RST_L); |
| power_signal_enable_interrupt(GPIO_PMIC_FAULT_L); |
| |
| set_pmic_pwron(1); |
| |
| disable_sleep(SLEEP_MASK_AP_RUN); |
| |
| CPRINTS("AP running ..."); |
| } |
| |
| /** |
| * 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 uint8_t check_for_power_on_event(void) |
| { |
| int ap_off_flag; |
| |
| ap_off_flag = system_get_reset_flags() & EC_RESET_FLAG_AP_OFF; |
| system_clear_reset_flags(EC_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 EC_RESET_FLAG_AP_OFF is on"); |
| return POWER_ON_CANCEL; |
| } |
| CPRINTS("system is on, thus clear auto_power_on"); |
| /* no need to arrange another power on */ |
| auto_power_on = 0; |
| return POWER_ON_BY_IN_POWER_GOOD; |
| } |
| if (ap_off_flag) { |
| CPRINTS("EC_RESET_FLAG_AP_OFF is on"); |
| power_off(); |
| return POWER_ON_CANCEL; |
| } |
| |
| CPRINTS("POWER_GOOD is not asserted"); |
| |
| /* power on requested at EC startup for recovery */ |
| if (auto_power_on) { |
| auto_power_on = 0; |
| return POWER_ON_BY_AUTO_POWER_ON; |
| } |
| |
| /* Check lid open */ |
| if (lid_opened) { |
| lid_opened = 0; |
| return POWER_ON_BY_LID_OPEN; |
| } |
| |
| /* check for power button press */ |
| if (power_button_is_pressed()) |
| return POWER_ON_BY_POWER_BUTTON_PRESSED; |
| |
| if (power_request == POWER_REQ_ON) { |
| power_request = POWER_REQ_NONE; |
| return POWER_ON_BY_POWER_REQ_ON; |
| } |
| |
| if (power_request == POWER_REQ_RESET) { |
| power_request = POWER_REQ_NONE; |
| return POWER_ON_BY_POWER_REQ_RESET; |
| } |
| |
| return POWER_OFF_CANCEL; |
| } |
| |
| /** |
| * Check for some event triggering the shutdown. |
| * |
| * It can be either a long power button press or a shutdown triggered from the |
| * AP and detected by reading POWER_GOOD. |
| * |
| * @return non-zero if a shutdown should happen, 0 if not |
| */ |
| static uint8_t check_for_power_off_event(void) |
| { |
| timestamp_t now; |
| int pressed = 0; |
| |
| /* |
| * Check for power button press. |
| */ |
| if (power_button_is_pressed()) { |
| pressed = POWER_OFF_BY_POWER_BUTTON_PRESSED; |
| } else if (power_request == POWER_REQ_OFF) { |
| power_request = POWER_REQ_NONE; |
| return POWER_OFF_BY_POWER_REQ_OFF; |
| } else if (power_request == POWER_REQ_RESET) { |
| /* |
| * The power_request flag will be cleared later |
| * in check_for_power_on_event() in S5. |
| */ |
| return POWER_OFF_BY_POWER_REQ_RESET; |
| } |
| |
| now = get_time(); |
| if (pressed) { |
| if (!power_button_was_pressed) { |
| power_off_deadline.val = now.val + DELAY_FORCE_SHUTDOWN; |
| CPRINTS("power waiting for long press %u", |
| power_off_deadline.le.lo); |
| /* Ensure we will wake up to check the power key */ |
| timer_arm(power_off_deadline, TASK_ID_CHIPSET); |
| } else if (timestamp_expired(power_off_deadline, &now)) { |
| power_off_deadline.val = 0; |
| CPRINTS("power off after long press now=%u, %u", |
| now.le.lo, power_off_deadline.le.lo); |
| return POWER_OFF_BY_LONG_PRESS; |
| } |
| } else if (power_button_was_pressed) { |
| CPRINTS("power off cancel"); |
| timer_cancel(TASK_ID_CHIPSET); |
| } |
| |
| power_button_was_pressed = pressed; |
| |
| /* POWER_GOOD released by AP : shutdown immediately */ |
| if (!power_has_signals(IN_POWER_GOOD)) { |
| if (power_button_was_pressed) |
| timer_cancel(TASK_ID_CHIPSET); |
| |
| CPRINTS("POWER_GOOD is lost"); |
| return POWER_OFF_BY_POWER_GOOD_LOST; |
| } |
| |
| return POWER_OFF_CANCEL; |
| } |
| |
| /*****************************************************************************/ |
| /* Chipset interface */ |
| |
| void chipset_force_shutdown(enum chipset_shutdown_reason reason) |
| { |
| CPRINTS("%s(%d)", __func__, reason); |
| report_ap_reset(reason); |
| |
| /* Issue a request to initiate a power-off sequence */ |
| power_request = POWER_REQ_OFF; |
| task_wake(TASK_ID_CHIPSET); |
| } |
| |
| void chipset_reset(enum chipset_reset_reason reason) |
| { |
| int rv; |
| |
| CPRINTS("%s(%d)", __func__, reason); |
| report_ap_reset(reason); |
| |
| /* The host command is used to hard reset AP. Check b/119261783 */ |
| if (reason == CHIPSET_RESET_HOST_CMD) { |
| request_cold_reset(); |
| return; |
| } |
| |
| /* |
| * Warm reset sequence: |
| * 1. Issue a low pulse to PM845_RESIN_L, which triggers PMIC |
| * to do a warm reset (requiring reprogramming PMIC registers |
| * to make PM845_RESIN_L as a warm reset trigger). |
| * 2. PMIC then issues a low pulse to AP_RST_L to reset AP. |
| * EC monitors the signal to see any low pulse. |
| * 2.1. If a low pulse found, done. |
| * 2.2. If a low pulse not found (the above PMIC registers |
| * not programmed or programmed wrong), issue a request |
| * to initiate a cold reset power sequence. |
| */ |
| |
| gpio_set_level(GPIO_PM845_RESIN_L, 0); |
| usleep(PMIC_RESIN_PULSE_LENGTH); |
| gpio_set_level(GPIO_PM845_RESIN_L, 1); |
| |
| rv = power_wait_signals_timeout(IN_AP_RST_ASSERTED, |
| PMIC_POWER_AP_RESPONSE_TIMEOUT); |
| /* Exception case: PMIC not work as expected, request a cold reset */ |
| if (rv != EC_SUCCESS) |
| request_cold_reset(); |
| } |
| |
| /** |
| * Power handler for steady states |
| * |
| * @param state Current power state |
| * @return Updated power state |
| */ |
| enum power_state power_handle_state(enum power_state state) |
| { |
| uint8_t value; |
| static uint8_t boot_from_g3, shutdown_from_s0; |
| |
| 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; |
| } |
| break; |
| |
| case POWER_S5S3: |
| /* |
| * Wait for power button release before actually boot AP. |
| * It may be a long-hold power button with volume buttons |
| * to trigger the recovery button. We don't want AP up |
| * during the long-hold. |
| */ |
| power_button_wait_for_release(-1); |
| |
| power_on(); |
| if (power_wait_signals(IN_POWER_GOOD) != EC_SUCCESS) { |
| CPRINTS("POWER_GOOD not seen in time"); |
| set_system_power(0); |
| return POWER_S5; |
| } |
| |
| CPRINTS("POWER_GOOD seen"); |
| /* Call hooks now that AP is running */ |
| hook_notify(HOOK_CHIPSET_STARTUP); |
| return POWER_S3; |
| |
| case POWER_S3: |
| if (shutdown_from_s0) { |
| value = shutdown_from_s0; |
| shutdown_from_s0 = 0; |
| } else { |
| value = check_for_power_off_event(); |
| } |
| |
| if (value) { |
| CPRINTS("power off %d", value); |
| return POWER_S3S5; |
| } |
| /* Go to S3S0 directly, as don't know if it is in suspend */ |
| return POWER_S3S0; |
| |
| case POWER_S3S0: |
| hook_notify(HOOK_CHIPSET_RESUME); |
| return POWER_S0; |
| |
| case POWER_S0: |
| shutdown_from_s0 = check_for_power_off_event(); |
| if (shutdown_from_s0) |
| return POWER_S0S3; |
| break; |
| |
| case POWER_S0S3: |
| /* |
| * If the power button is pressing, we need cancel the long |
| * press timer, otherwise EC will crash. |
| */ |
| if (power_button_was_pressed) |
| timer_cancel(TASK_ID_CHIPSET); |
| |
| /* 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_off(); |
| /* |
| * Wait forever for the release of the power button; otherwise, |
| * this power button press will then trigger a power-on in S5. |
| */ |
| power_button_wait_for_release(-1); |
| power_button_was_pressed = 0; |
| return POWER_S5; |
| |
| case POWER_S5G3: |
| return POWER_G3; |
| } |
| |
| return state; |
| } |
| |
| /*****************************************************************************/ |
| /* Console debug command */ |
| |
| static const char *power_req_name[POWER_REQ_COUNT] = { |
| "none", |
| "off", |
| "on", |
| }; |
| |
| /* Power states that we can report */ |
| enum power_state_t { |
| PSTATE_UNKNOWN, |
| PSTATE_OFF, |
| PSTATE_ON, |
| PSTATE_COUNT, |
| }; |
| |
| static const char * const state_name[] = { |
| "unknown", |
| "off", |
| "on", |
| }; |
| |
| static int command_power(int argc, char **argv) |
| { |
| int v; |
| |
| if (argc < 2) { |
| enum power_state_t state; |
| |
| state = PSTATE_UNKNOWN; |
| if (chipset_in_state(CHIPSET_STATE_ANY_OFF)) |
| state = PSTATE_OFF; |
| if (chipset_in_state(CHIPSET_STATE_ON)) |
| state = PSTATE_ON; |
| ccprintf("%s\n", state_name[state]); |
| |
| return EC_SUCCESS; |
| } |
| |
| if (!parse_bool(argv[1], &v)) |
| return EC_ERROR_PARAM1; |
| |
| power_request = v ? POWER_REQ_ON : POWER_REQ_OFF; |
| ccprintf("Requesting power %s\n", power_req_name[power_request]); |
| task_wake(TASK_ID_CHIPSET); |
| |
| return EC_SUCCESS; |
| } |
| DECLARE_CONSOLE_COMMAND(power, command_power, |
| "on/off", |
| "Turn AP power on/off"); |