From 63d82734aa8d4d3f11f4178bdf54cc61f0ea6559 Mon Sep 17 00:00:00 2001 From: Wai-Hong Tam Date: Tue, 8 Oct 2019 11:15:03 -0700 Subject: Trogdor: Initial board commit This is an initial commit for Trogdor. Use Cheza as a baseline. Make the change according to the schematic, e.g. * Reflect the GPIO change * Reflect the TCPC/PPC part change * Update the USB topology, e.g. no device mode support * Remove the detachable related code * Add keyboard support * Support keyboard backlight * Update the battery characteristic * Add initial support of muxing DP path * Support a single USB-A port * Change sensors from lid to base * Minor code style improvement BRANCH=None BUG=b:143616352 TEST=BOARD=trogdor make Change-Id: Ia9bb0adfcb8d347e6335fd3ae1e565b0f9d1a025 Signed-off-by: Wai-Hong Tam Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1847204 Reviewed-by: Stephen Boyd Reviewed-by: Alexandru M Stan --- power/build.mk | 1 + power/sc7180.c | 880 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 881 insertions(+) create mode 100644 power/sc7180.c (limited to 'power') diff --git a/power/build.mk b/power/build.mk index 4dfa240a99..2a22057982 100644 --- a/power/build.mk +++ b/power/build.mk @@ -17,6 +17,7 @@ power-$(CONFIG_CHIPSET_MT817X)+=mt817x.o power-$(CONFIG_CHIPSET_MT8183)+=mt8183.o power-$(CONFIG_CHIPSET_RK3288)+=rk3288.o power-$(CONFIG_CHIPSET_RK3399)+=rk3399.o +power-$(CONFIG_CHIPSET_SC7180)+=sc7180.o power-$(CONFIG_CHIPSET_SDM845)+=sdm845.o power-$(CONFIG_CHIPSET_SKYLAKE)+=skylake.o intel_x86.o power-$(CONFIG_CHIPSET_STONEY)+=stoney.o diff --git a/power/sc7180.c b/power/sc7180.c new file mode 100644 index 0000000000..21be404e2c --- /dev/null +++ b/power/sc7180.c @@ -0,0 +1,880 @@ +/* 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"); -- cgit v1.2.1