diff options
Diffstat (limited to 'zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c')
| -rw-r--r-- | zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c | 205 |
1 files changed, 142 insertions, 63 deletions
diff --git a/zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c b/zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c index 2f38c36684..48cab7f6e7 100644 --- a/zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c +++ b/zephyr/subsys/ap_pwrseq/x86_non_dsx_common_pwrseq_sm_handler.c @@ -1,25 +1,42 @@ -/* Copyright 2022 The Chromium OS Authors. All rights reserved. +/* Copyright 2022 The ChromiumOS Authors * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ +#include <atomic.h> #include <zephyr/init.h> #include <x86_non_dsx_common_pwrseq_sm_handler.h> -static K_KERNEL_STACK_DEFINE(pwrseq_thread_stack, - CONFIG_AP_PWRSEQ_STACK_SIZE); +static K_KERNEL_STACK_DEFINE(pwrseq_thread_stack, CONFIG_AP_PWRSEQ_STACK_SIZE); static struct k_thread pwrseq_thread_data; -static struct pwrseq_context pwrseq_ctx; +static struct pwrseq_context pwrseq_ctx = { + .power_state = SYS_POWER_STATE_UNINIT, +}; +static struct k_sem pwrseq_sem; + +static void s5_inactive_timer_handler(struct k_timer *timer); /* S5 inactive timer*/ -K_TIMER_DEFINE(s5_inactive_timer, NULL, NULL); +K_TIMER_DEFINE(s5_inactive_timer, s5_inactive_timer_handler, NULL); +/* + * Flags, may be set/cleared from other threads. + */ +enum { + S5_INACTIVE_TIMER_RUNNING, + START_FROM_G3, + FLAGS_MAX, +}; +static ATOMIC_DEFINE(flags, FLAGS_MAX); +/* Delay in ms when starting from G3 */ +static uint32_t start_from_g3_delay_ms; LOG_MODULE_REGISTER(ap_pwrseq, CONFIG_AP_PWRSEQ_LOG_LEVEL); /** * @brief power_state names for debug */ -static const char * const pwrsm_dbg[] = { +static const char *const pwrsm_dbg[] = { + [SYS_POWER_STATE_UNINIT] = "Unknown", [SYS_POWER_STATE_G3] = "G3", [SYS_POWER_STATE_S5] = "S5", [SYS_POWER_STATE_S4] = "S4", @@ -48,17 +65,17 @@ static const char * const pwrsm_dbg[] = { */ static inline bool signals_valid(power_signal_mask_t signals) { -#if defined(CONFIG_PLATFORM_EC_ESPI_VW_SLP_S3) +#if defined(CONFIG_PLATFORM_EC_HOST_INTERFACE_ESPI_VW_SLP_S3) if ((signals & POWER_SIGNAL_MASK(PWR_SLP_S3)) && power_signal_get(PWR_SLP_S3) < 0) return false; #endif -#if defined(CONFIG_PLATFORM_EC_ESPI_VW_SLP_S4) +#if defined(CONFIG_PLATFORM_EC_HOST_INTERFACE_ESPI_VW_SLP_S4) if ((signals & POWER_SIGNAL_MASK(PWR_SLP_S4)) && power_signal_get(PWR_SLP_S4) < 0) return false; #endif -#if defined(CONFIG_PLATFORM_EC_ESPI_VW_SLP_S5) +#if defined(CONFIG_PLATFORM_EC_HOST_INTERFACE_ESPI_VW_SLP_S5) if ((signals & POWER_SIGNAL_MASK(PWR_SLP_S5)) && power_signal_get(PWR_SLP_S5) < 0) return false; @@ -81,7 +98,7 @@ enum power_states_ndsx pwr_sm_get_state(void) return pwrseq_ctx.power_state; } -const char * const pwr_sm_get_state_name(enum power_states_ndsx state) +const char *const pwr_sm_get_state_name(enum power_states_ndsx state) { return pwrsm_dbg[state]; } @@ -95,14 +112,34 @@ void pwr_sm_set_state(enum power_states_ndsx new_state) pwrseq_ctx.power_state = new_state; } -void request_exit_hardoff(bool should_exit) +void ap_pwrseq_wake(void) { - pwrseq_ctx.want_g3_exit = should_exit; + k_sem_give(&pwrseq_sem); } -static bool chipset_is_exit_hardoff(void) +/* + * Set a flag to enable starting the AP once it is in G3. + * This is called from ap_power_exit_hardoff() which checks + * to ensure that the AP is in S5 or G3 state before calling + * this function. + * It can also be called via a hostcmd, which allows the flag + * to be set in any AP state. + */ +void request_start_from_g3(void) { - return pwrseq_ctx.want_g3_exit; + LOG_INF("Request start from G3"); + atomic_set_bit(flags, START_FROM_G3); + /* + * If in S5, restart the timer to give the CPU more time + * to respond to a power button press (which is presumably + * why we are being called). This avoids having the S5 + * inactivity timer expiring before the AP can process + * the power button press and start up. + */ + if (pwr_sm_get_state() == SYS_POWER_STATE_S5) { + atomic_clear_bit(flags, S5_INACTIVE_TIMER_RUNNING); + } + ap_pwrseq_wake(); } void ap_power_force_shutdown(enum ap_power_shutdown_reason reason) @@ -110,6 +147,11 @@ void ap_power_force_shutdown(enum ap_power_shutdown_reason reason) board_ap_power_force_shutdown(); } +static void s5_inactive_timer_handler(struct k_timer *timer) +{ + ap_pwrseq_wake(); +} + static void shutdown_and_notify(enum ap_power_shutdown_reason reason) { ap_power_force_shutdown(reason); @@ -117,9 +159,9 @@ static void shutdown_and_notify(enum ap_power_shutdown_reason reason) ap_power_ev_send_callbacks(AP_POWER_SHUTDOWN_COMPLETE); } -void set_reboot_ap_at_g3_delay_seconds(uint32_t d_time) +void set_start_from_g3_delay_seconds(uint32_t d_time) { - pwrseq_ctx.reboot_ap_at_g3_delay_ms = d_time * MSEC; + start_from_g3_delay_ms = d_time * MSEC; } void apshutdown(void) @@ -190,15 +232,16 @@ static int common_pwr_sm_run(int state) { switch (state) { case SYS_POWER_STATE_G3: - if (chipset_is_exit_hardoff()) { - request_exit_hardoff(false); - /* - * G3->S0 transition should happen only after the - * user specified delay. Hence, wait until the - * user specified delay times out. - */ - k_msleep(pwrseq_ctx.reboot_ap_at_g3_delay_ms); - pwrseq_ctx.reboot_ap_at_g3_delay_ms = 0; + /* + * If the START_FROM_G3 flag is set, begin starting + * the AP. There may be a delay set, so only start + * after that delay. + */ + if (atomic_test_and_clear_bit(flags, START_FROM_G3)) { + LOG_INF("Starting from G3, delay %d ms", + start_from_g3_delay_ms); + k_msleep(start_from_g3_delay_ms); + start_from_g3_delay_ms = 0; return SYS_POWER_STATE_G3S5; } @@ -207,7 +250,7 @@ static int common_pwr_sm_run(int state) case SYS_POWER_STATE_G3S5: if ((power_get_signals() & PWRSEQ_G3S5_UP_SIGNAL) == - PWRSEQ_G3S5_UP_VALUE) + PWRSEQ_G3S5_UP_VALUE) return SYS_POWER_STATE_S5; else return SYS_POWER_STATE_S5G3; @@ -215,29 +258,56 @@ static int common_pwr_sm_run(int state) case SYS_POWER_STATE_S5: /* In S5 make sure no more signal lost */ /* If A-rails are stable then move to higher state */ - if (board_ap_power_check_power_rails_enabled() - && rsmrst_power_is_good()) { + if (board_ap_power_check_power_rails_enabled() && + rsmrst_power_is_good()) { /* rsmrst is intact */ rsmrst_pass_thru_handler(); if (signals_valid_and_off(IN_PCH_SLP_S5)) { k_timer_stop(&s5_inactive_timer); + /* Clear the timer running flag */ + atomic_clear_bit(flags, + S5_INACTIVE_TIMER_RUNNING); + /* Clear any request to exit hard-off */ + atomic_clear_bit(flags, START_FROM_G3); + LOG_INF("Clearing request to exit G3"); return SYS_POWER_STATE_S5S4; } } - /* S5 inactivity timeout, go to S5G3 */ + /* + * S5 state has an inactivity timer, so moving + * to S5G3 (where the power rails are turned off) is + * delayed for some time, usually ~10 seconds or so. + * The purpose of this delay is: + * - to handle AP initiated cold boot, where the AP + * will go to S5 for a short time and then restart. + * - give time for the power button to be pressed, + * which may set the START_FROM_G3 flag. + */ if (AP_PWRSEQ_DT_VALUE(s5_inactivity_timeout) == 0) return SYS_POWER_STATE_S5G3; else if (AP_PWRSEQ_DT_VALUE(s5_inactivity_timeout) > 0) { - if (k_timer_status_get(&s5_inactive_timer) > 0) + /* + * Test and set timer running flag. + * If it was 0, then the timer wasn't running + * and it is started (and the flag is set), + * otherwise it is already set, so no change. + */ + if (!atomic_test_and_set_bit( + flags, S5_INACTIVE_TIMER_RUNNING)) { + /* + * Timer is not started, or needs + * restarting. + */ + k_timer_start(&s5_inactive_timer, + K_SECONDS(AP_PWRSEQ_DT_VALUE( + s5_inactivity_timeout)), + K_NO_WAIT); + } else if (k_timer_status_get(&s5_inactive_timer) > 0) { /* Timer is expired */ + atomic_clear_bit(flags, + S5_INACTIVE_TIMER_RUNNING); return SYS_POWER_STATE_S5G3; - else if (k_timer_remaining_get( - &s5_inactive_timer) == 0) - /* Timer is not started or stopped */ - k_timer_start(&s5_inactive_timer, - K_SECONDS(AP_PWRSEQ_DT_VALUE( - s5_inactivity_timeout)), - K_NO_WAIT); + } } break; @@ -318,7 +388,7 @@ static int common_pwr_sm_run(int state) case SYS_POWER_STATE_S0ix: /* System in S0 only if SLP_S0 and SLP_S3 are de-asserted */ if (power_signals_off(IN_PCH_SLP_S0) && - signals_valid_and_off(IN_PCH_SLP_S3)) { + signals_valid_and_off(IN_PCH_SLP_S3)) { /* TODO: Make sure ap reset handling is done * before leaving S0ix. */ @@ -334,6 +404,7 @@ static int common_pwr_sm_run(int state) * HC already set sleep suspend state. */ ap_power_sleep_notify_transition(AP_POWER_SLEEP_SUSPEND); + ap_power_ev_send_callbacks(AP_POWER_S0IX_SUSPEND); /* * Enable idle task deep sleep. Allow the low power idle task @@ -354,9 +425,11 @@ static int common_pwr_sm_run(int state) */ disable_sleep(SLEEP_MASK_AP_RUN); + ap_power_ev_send_callbacks(AP_POWER_S0IX_RESUME #if CONFIG_PLATFORM_EC_CHIPSET_RESUME_INIT_HOOK - ap_power_ev_send_callbacks(AP_POWER_RESUME_INIT); + | AP_POWER_RESUME_INIT #endif + ); return SYS_POWER_STATE_S0; @@ -370,19 +443,19 @@ static int common_pwr_sm_run(int state) return SYS_POWER_STATE_S0S3; #if CONFIG_AP_PWRSEQ_S0IX - /* - * SLP_S0 may assert in system idle scenario without a kernel - * freeze call. This may cause interrupt storm since there is - * no freeze/unfreeze of threads/process in the idle scenario. - * Ignore the SLP_S0 assertions in idle scenario by checking - * the host sleep state. - */ + /* + * SLP_S0 may assert in system idle scenario without a + * kernel freeze call. This may cause interrupt storm + * since there is no freeze/unfreeze of threads/process + * in the idle scenario. Ignore the SLP_S0 assertions in + * idle scenario by checking the host sleep state. + */ } else if (ap_power_sleep_get_notify() == - AP_POWER_SLEEP_SUSPEND && - power_signals_on(IN_PCH_SLP_S0)) { + AP_POWER_SLEEP_SUSPEND && + power_signals_on(IN_PCH_SLP_S0)) { return SYS_POWER_STATE_S0S0ix; } else if (ap_power_sleep_get_notify() == - AP_POWER_SLEEP_RESUME) { + AP_POWER_SLEEP_RESUME) { ap_power_sleep_notify_transition(AP_POWER_SLEEP_RESUME); #endif /* CONFIG_AP_PWRSEQ_S0IX */ } @@ -464,12 +537,16 @@ static void pwr_seq_set_initial_state(void) static void pwrseq_loop_thread(void *p1, void *p2, void *p3) { - int32_t t_wait_ms = 10; enum power_states_ndsx curr_state, new_state; power_signal_mask_t this_in_signals; power_signal_mask_t last_in_signals = 0; enum power_states_ndsx last_state = -1; + /* + * Let clients know that the AP power state is now + * initialized and ready. + */ + ap_power_ev_send_callbacks(AP_POWER_INITIALIZED); while (1) { curr_state = pwr_sm_get_state(); @@ -482,9 +559,8 @@ static void pwrseq_loop_thread(void *p1, void *p2, void *p3) this_in_signals = power_get_signals(); if (this_in_signals != last_in_signals || - curr_state != last_state) { - LOG_INF("power state %d = %s, in 0x%04x", - curr_state, + curr_state != last_state) { + LOG_INF("power state %d = %s, in 0x%04x", curr_state, pwr_sm_get_state_name(curr_state), this_in_signals); last_in_signals = this_in_signals; @@ -506,22 +582,24 @@ static void pwrseq_loop_thread(void *p1, void *p2, void *p3) if (curr_state != new_state) { pwr_sm_set_state(new_state); ap_power_set_active_wake_mask(); + } else { + /* + * No state transition, we can go to sleep and wait + * for any event to wake us up. + */ + k_sem_take(&pwrseq_sem, K_FOREVER); } - - k_msleep(t_wait_ms); } } static inline void create_pwrseq_thread(void) { - k_thread_create(&pwrseq_thread_data, - pwrseq_thread_stack, + k_thread_create(&pwrseq_thread_data, pwrseq_thread_stack, K_KERNEL_STACK_SIZEOF(pwrseq_thread_stack), - (k_thread_entry_t)pwrseq_loop_thread, - NULL, NULL, NULL, + (k_thread_entry_t)pwrseq_loop_thread, NULL, NULL, NULL, CONFIG_AP_PWRSEQ_THREAD_PRIORITY, 0, - IS_ENABLED(CONFIG_AP_PWRSEQ_AUTOSTART) ? K_NO_WAIT - : K_FOREVER); + IS_ENABLED(CONFIG_AP_PWRSEQ_AUTOSTART) ? K_NO_WAIT : + K_FOREVER); k_thread_name_set(&pwrseq_thread_data, "pwrseq_task"); } @@ -535,7 +613,7 @@ void ap_pwrseq_task_start(void) static void init_pwr_seq_state(void) { - request_exit_hardoff(false); + atomic_clear_bit(flags, START_FROM_G3); /* * The state of the CPU needs to be determined now * so that init routines can check the state of @@ -549,6 +627,7 @@ static int pwrseq_init(const struct device *dev) { LOG_INF("Pwrseq Init"); + k_sem_init(&pwrseq_sem, 0, 1); /* Initialize signal handlers */ power_signal_init(); LOG_DBG("Init pwr seq state"); @@ -559,7 +638,7 @@ static int pwrseq_init(const struct device *dev) } /* - * The initialisation must occur after system I/O initialisation that + * The initialization must occur after system I/O initialization that * the signals depend upon, such as GPIO, ADC etc. */ SYS_INIT(pwrseq_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY); |