diff options
Diffstat (limited to 'power/tegra.c')
| -rw-r--r-- | power/tegra.c | 586 |
1 files changed, 0 insertions, 586 deletions
diff --git a/power/tegra.c b/power/tegra.c deleted file mode 100644 index 8f6ba9e4b1..0000000000 --- a/power/tegra.c +++ /dev/null @@ -1,586 +0,0 @@ -/* Copyright (c) 2013 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. - */ - -/* - * TEGRA SoC power sequencing module for Chrome EC - * - * This implements the following features: - * - * - Cold reset powers on the AP - * - * When powered off: - * - Press pwron turns on the AP - * - Hold pwron turns on the AP, and then 9s later turns it off and leaves - * it off until pwron is released and pressed again - * - * When powered on: - * - The PMIC PWRON signal is released <= 1 second after the power button is - * released - * - Holding pwron for 10.2s powers off the AP - * - Pressing and releasing pwron within that 10.2s is ignored - * - If XPSHOLD is dropped by the AP, then we power the AP off - * - If SUSPEND_L goes low, enter suspend mode. - * - */ - -#include "battery.h" -#include "charge_state.h" -#include "chipset.h" /* This module implements chipset functions too */ -#include "clock.h" -#include "common.h" -#include "console.h" -#include "gpio.h" -#include "hooks.h" -#include "lid_switch.h" -#include "keyboard_scan.h" -#include "power.h" -#include "power_button.h" -#include "power_led.h" -#include "system.h" -#include "task.h" -#include "timer.h" -#include "util.h" - -/* Console output macros */ -#define CPUTS(outstr) cputs(CC_CHIPSET, outstr) -#define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args) - -/* masks for power signals */ -#define IN_XPSHOLD POWER_SIGNAL_MASK(TEGRA_XPSHOLD) -#define IN_SUSPEND POWER_SIGNAL_MASK(TEGRA_SUSPEND_ASSERTED) - -/* Long power key press to force shutdown */ -#define DELAY_FORCE_SHUTDOWN (10200 * MSEC) /* 10.2 seconds */ - -/* - * The minimum time to assert the PMIC PWRON pin is 20ms. - * Give it longer to ensure the PMIC doesn't lose it. - */ -#define PMIC_PWRON_DEBOUNCE_TIME (20 * MSEC * 3) - -/* - * The minimum time to assert the PMIC THERM pin is 32us. However, - * it needs to be extended to about 50ms to let the 5V rail - * dissipate fully. - */ -#define PMIC_THERM_HOLD_TIME (50 * MSEC) - -/* - * If the power key 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 XPSHOLD == 0). - */ -#define DELAY_SHUTDOWN_ON_POWER_HOLD (10200 * MSEC) /* 10.2 seconds */ - -/* - * The hold time for pulling down the PMIC_WARM_RESET_L pin so that - * the AP can entery the recovery mode (flash SPI flash from USB). - */ -#define PMIC_WARM_RESET_L_HOLD_TIME (4 * MSEC) - -/* - * The first time the PMIC sees power (AC or battery) it needs 200ms (+/-12% - * oscillator tolerance) for the RTC startup. In addition there is a startup - * time of approx. 0.5msec until V2_5 regulator starts up. */ -#define PMIC_RTC_STARTUP (225 * 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; - -/* 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_COUNT, -}; - -static enum power_request_t power_request; - - -/* Forward declaration */ -static void chipset_turn_off_power_rails(void); - - -/** - * Set the AP RESET signal. - * - * This function is for backward-compatibility. - * - * AP_RESET_L (PB3) is stuffed before rev <= 2.0 and connected to PMIC RESET. - * After rev >= 2.2, this is removed. This should not effected the new board. - * - * @param asserted Assert (=1) or deassert (=0) the signal. This is the - * logical level of the pin, not the physical level. - */ -static void set_ap_reset(int asserted) -{ - /* Signal is active-low */ - gpio_set_level(GPIO_AP_RESET_L, asserted ? 0 : 1); -} - -/** - * Set the PMIC PWRON signal. - * - * Note that asserting requires holding for PMIC_PWRON_DEBOUNCE_TIME. - * - * @param asserted Assert (=1) or deassert (=0) the signal. This is the - * logical level of the pin, not the physical level. - */ -static void set_pmic_pwron(int asserted) -{ - /* Signal is active-low */ - gpio_set_level(GPIO_PMIC_PWRON_L, asserted ? 0 : 1); -} - -/** - * Set the PMIC THERM to force shutdown the AP. - * - * @param asserted Assert (=1) or deassert (=0) the signal. This is the - * logical level of the pin, not the physical level. - */ -static void set_pmic_therm(int asserted) -{ - /* Signal is active-low */ - gpio_set_level(GPIO_PMIC_THERM_L, asserted ? 0 : 1); -} - -/** - * 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 XPSHOLD. - * - * @return non-zero if a shutdown should happen, 0 if not - */ -static int check_for_power_off_event(void) -{ - timestamp_t now; - int pressed = 0; - - /* - * Check for power button press. - */ - if (power_button_is_pressed()) { - pressed = 1; - } else if (power_request == POWER_REQ_OFF) { - power_request = POWER_REQ_NONE; - return 4; /* return non-zero for shutdown */ - } - - now = get_time(); - if (pressed) { -#ifndef CONFIG_PMIC_FW_LONG_PRESS_TIMER - /* - * Only assert PMIC_PWRON if PMIC supports long-press - * power off. - */ - set_pmic_pwron(1); - usleep(PMIC_PWRON_DEBOUNCE_TIME); -#endif - - 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); -#ifdef CONFIG_PMIC_FW_LONG_PRESS_TIMER - /* Ensure we will wake up to check the power key */ - timer_arm(power_off_deadline, TASK_ID_CHIPSET); -#endif - } 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 2; - } - } else if (power_button_was_pressed) { - CPRINTS("power off cancel"); - set_pmic_pwron(0); -#ifdef CONFIG_PMIC_FW_LONG_PRESS_TIMER - timer_cancel(TASK_ID_CHIPSET); -#endif - } - - power_button_was_pressed = pressed; - - /* XPSHOLD released by AP : shutdown immediately */ - if (!power_has_signals(IN_XPSHOLD)) - return 3; - - return 0; -} - -#ifndef CONFIG_POWER_IGNORE_LID_OPEN -static void tegra_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, tegra_lid_event, HOOK_PRIO_DEFAULT); -#endif /* !CONFIG_POWER_IGNORE_LID_OPEN */ - -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 Tegra 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_XPSHOLD) { - init_power_state = POWER_S0; - disable_sleep(SLEEP_MASK_AP_RUN); - } else { - init_power_state = POWER_G3; - enable_sleep(SLEEP_MASK_AP_RUN); - } - } - - /* 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; -} - -/*****************************************************************************/ -/* Chipset interface */ - -static void chipset_turn_off_power_rails(void) -{ - /* Release the power button, if it was asserted */ - set_pmic_pwron(0); - - /* Assert AP reset to shutdown immediately */ - set_pmic_therm(1); - usleep(PMIC_THERM_HOLD_TIME); - set_pmic_therm(0); - - /* Hold the reset pin so that the AP stays in off mode (rev <= 2.0) */ - set_ap_reset(1); -} - -void chipset_force_shutdown(void) -{ - chipset_turn_off_power_rails(); - - /* clean-up internal variable */ - power_request = POWER_REQ_NONE; -} - -/*****************************************************************************/ - -/** - * 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_XPSHOLD) { - 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; -} - -/** - * Power on the AP - */ -static void power_on(void) -{ - uint64_t t; - - /* Set pull-up and enable interrupt */ - gpio_set_flags(power_signal_list[TEGRA_SUSPEND_ASSERTED].gpio, - GPIO_INPUT | GPIO_PULL_UP | GPIO_INT_BOTH); - - /* Make sure we de-assert the PMI_THERM_L and AP_RESET_L pin. */ - set_pmic_therm(0); - set_ap_reset(0); - - /* - * Before we push PMIC power button, wait for the PMI RTC ready, which - * takes PMIC_RTC_STARTUP from the AC/battery is plugged in. - */ - t = get_time().val; - if (t < PMIC_RTC_STARTUP) { - uint32_t wait = PMIC_RTC_STARTUP - t; - CPRINTS("wait for %dms for PMIC RTC start-up", - wait / MSEC); - usleep(wait); - } - - /* - * When power_on() is called, we are at S5S3. Initialize components - * to ready state before AP is up. - */ - hook_notify(HOOK_CHIPSET_PRE_INIT); - - /* Push the power button */ - set_pmic_pwron(1); - usleep(PMIC_PWRON_DEBOUNCE_TIME); - - disable_sleep(SLEEP_MASK_AP_RUN); - powerled_set_state(POWERLED_STATE_ON); - - /* Call hooks now that AP is running */ - hook_notify(HOOK_CHIPSET_STARTUP); - - CPRINTS("AP running ..."); -} - -/** - * Wait for the power button to be released - * - * @param timeout_us Timeout in microseconds, or -1 to wait forever - * @return EC_SUCCESS if ok, or - * EC_ERROR_TIMEOUT if power button failed to release - */ -static int wait_for_power_button_release(unsigned int timeout_us) -{ - timestamp_t deadline; - timestamp_t now = get_time(); - - deadline.val = now.val + timeout_us; - - while (power_button_is_pressed()) { - now = get_time(); - if (timeout_us < 0) { - task_wait_event(-1); - } else if (timestamp_expired(deadline, &now) || - (task_wait_event(deadline.val - now.val) == - TASK_EVENT_TIMER)) { - CPRINTS("power button not released in time"); - return EC_ERROR_TIMEOUT; - } - } - - CPRINTS("power button released"); - power_button_was_pressed = 0; - return EC_SUCCESS; -} - -/** - * 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 pin to high-Z to reduce power draw. */ - gpio_set_flags(power_signal_list[TEGRA_SUSPEND_ASSERTED].gpio, - GPIO_INPUT); - - lid_opened = 0; - powerled_set_state(POWERLED_STATE_OFF); - CPRINTS("power shutdown complete"); -} - -void chipset_reset(int is_cold) -{ - if (is_cold) { - CPRINTS("EC triggered cold reboot"); - power_off(); - /* After XPSHOLD is dropped off, the system will be on again */ - power_request = POWER_REQ_ON; - } else { - CPRINTS("EC triggered warm reboot"); - CPRINTS("assert GPIO_PMIC_WARM_RESET_L for %d ms", - PMIC_WARM_RESET_L_HOLD_TIME / MSEC); - gpio_set_level(GPIO_PMIC_WARM_RESET_L, 0); - usleep(PMIC_WARM_RESET_L_HOLD_TIME); - gpio_set_level(GPIO_PMIC_WARM_RESET_L, 1); - } -} - -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: - power_on(); - if (power_wait_signals(IN_XPSHOLD) == EC_SUCCESS) { - CPRINTS("XPSHOLD seen"); - if (wait_for_power_button_release( - DELAY_SHUTDOWN_ON_POWER_HOLD) == - EC_SUCCESS) { - set_pmic_pwron(0); - 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("XPSHOLD not seen in time"); - } - set_pmic_pwron(0); - return POWER_S5; - - case POWER_S3: - if (!(power_get_signals() & IN_XPSHOLD)) - return POWER_S3S5; - else if (!(power_get_signals() & IN_SUSPEND)) - return POWER_S3S0; - return state; - - case POWER_S3S0: - disable_sleep(SLEEP_MASK_AP_RUN); - 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); - enable_sleep(SLEEP_MASK_AP_RUN); - return POWER_S3; - - case POWER_S3S5: - wait_for_power_button_release(-1); - return POWER_S5; - - case POWER_S5G3: - return POWER_G3; - } - - return state; -} - -static void powerbtn_tegra_changed(void) -{ - task_wake(TASK_ID_CHIPSET); -} -DECLARE_HOOK(HOOK_POWER_BUTTON_CHANGE, powerbtn_tegra_changed, - HOOK_PRIO_DEFAULT); |