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 <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1847204
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Alexandru M Stan <amstan@chromium.org>

2 files changed, 881 insertions, 0 deletions

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");