static enum power_state power_wait_s5_rtc_reset(void) { static int s5_exit_tries; /* Wait for S5 exit and then attempt RTC reset */ while ((power_get_signals() & IN_PCH_SLP_S4_DEASSERTED) == 0) { /* Handle RSMRST passthru event while waiting */ handle_rsmrst(POWER_S5); if (task_wait_event(SECOND*4) == TASK_EVENT_TIMER) { CPRINTS("timeout waiting for S5 exit"); chipset_force_g3(); /* Assert RTCRST# and retry 5 times */ board_rtc_reset(); if (++s5_exit_tries > 4) { s5_exit_tries = 0; return POWER_G3; /* Stay off */ } udelay(10 * MSEC); return POWER_G3S5; /* Power up again */ } } s5_exit_tries = 0; return POWER_S5S3; /* Power up to next state */ }
/** * Power off the AP */ static void power_off(void) { unsigned int power_off_timeout = 100; /* ms */ /* Call hooks before we drop power rails */ hook_notify(HOOK_CHIPSET_SHUTDOWN); /* switch off all rails */ chipset_turn_off_power_rails(); /* Change SUSPEND_L and EC_INT pin to high-Z to reduce power draw. */ gpio_set_flags(GPIO_SUSPEND_L, GPIO_INPUT); gpio_set_flags(GPIO_EC_INT_L, GPIO_INPUT); /* Wait till we actually turn off to not mess up the state machine. */ while (power_get_signals() & IN_POWER_GOOD) { msleep(1); power_off_timeout--; ASSERT(power_off_timeout); } lid_opened = 0; enable_sleep(SLEEP_MASK_AP_RUN); powerled_set_state(POWERLED_STATE_OFF); CPRINTS("power shutdown complete"); }
enum power_state power_chipset_init(void) { /* * If we're switching between images without rebooting, see if the x86 * is already powered on; if so, leave it there instead of cycling * through G3. */ if (system_jumped_to_this_image()) { if ((power_get_signals() & IN_ALL_S0) == IN_ALL_S0) { /* Disable idle task deep sleep when in S0. */ disable_sleep(SLEEP_MASK_AP_RUN); CPRINTS("already in S0"); return POWER_S0; } else { /* Force all signals to their G3 states */ CPRINTS("forcing G3"); gpio_set_level(GPIO_PCH_PWROK, 0); gpio_set_level(GPIO_SYS_PWROK, 0); gpio_set_level(GPIO_PP1050_EN, 0); gpio_set_level(GPIO_PP1200_EN, 0); gpio_set_level(GPIO_PP1800_EN, 0); gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0); gpio_set_level(GPIO_PP5000_USB_EN, 0); gpio_set_level(GPIO_PP5000_EN, 0); gpio_set_level(GPIO_PCH_DPWROK, 0); gpio_set_level(GPIO_PP3300_DSW_EN, 0); wireless_set_state(WIRELESS_OFF); } } return POWER_G3; }
/** * 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_POWER_GOOD) { 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; }
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 RK 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_POWER_GOOD) init_power_state = POWER_S0; else init_power_state = POWER_G3; } /* 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; }
enum power_state power_chipset_init(void) { /* * If we're switching between images without rebooting, see if the x86 * is already powered on; if so, leave it there instead of cycling * through G3. */ if (system_jumped_to_this_image()) { if ((power_get_signals() & IN_ALL_S0) == IN_ALL_S0) { /* Disable idle task deep sleep when in S0. */ disable_sleep(SLEEP_MASK_AP_RUN); CPRINTS("already in S0"); return POWER_S0; } else { /* Force all signals to their G3 states */ chipset_force_g3(); } } return POWER_G3; }
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: hook_notify(HOOK_CHIPSET_PRE_INIT); power_on(); disable_sleep(SLEEP_MASK_AP_RUN); powerled_set_state(POWERLED_STATE_ON); if (power_wait_signals(IN_POWER_GOOD) == EC_SUCCESS) { CPRINTS("POWER_GOOD seen"); if (power_button_wait_for_release( DELAY_SHUTDOWN_ON_POWER_HOLD) == EC_SUCCESS) { power_button_was_pressed = 0; set_pmic_pwron(0); /* setup misc gpio for S3/S0 functionality */ gpio_set_flags(GPIO_SUSPEND_L, GPIO_INPUT | GPIO_INT_BOTH | GPIO_PULL_DOWN); gpio_set_flags(GPIO_EC_INT_L, GPIO_OUTPUT | GPIO_OUT_HIGH); /* Call hooks now that AP is running */ hook_notify(HOOK_CHIPSET_STARTUP); 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("POWER_GOOD not seen in time"); } chipset_turn_off_power_rails(); return POWER_S5; case POWER_S3: if (!(power_get_signals() & IN_POWER_GOOD)) return POWER_S3S5; else if (!(power_get_signals() & IN_SUSPEND)) return POWER_S3S0; return state; case POWER_S3S0: 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); return POWER_S3; case POWER_S3S5: power_button_wait_for_release(-1); power_button_was_pressed = 0; return POWER_S5; case POWER_S5G3: return POWER_G3; } return state; }
enum power_state power_handle_state(enum power_state state) { switch (state) { case POWER_G3: break; case POWER_S5: if (gpio_get_level(GPIO_PCH_SLP_S5_L) == 1) return POWER_S5S3; /* Power up to next state */ break; case POWER_S3: /* Check for state transitions */ if (!power_has_signals(IN_PGOOD_S3)) { /* Required rail went away */ chipset_force_shutdown(); return POWER_S3S5; } else if (gpio_get_level(GPIO_PCH_SLP_S3_L) == 1) { /* Power up to next state */ return POWER_S3S0; } else if (gpio_get_level(GPIO_PCH_SLP_S5_L) == 0) { /* Power down to next state */ return POWER_S3S5; } break; case POWER_S0: if (!power_has_signals(IN_PGOOD_S0)) { /* Required rail went away */ chipset_force_shutdown(); return POWER_S0S3; } else if (gpio_get_level(GPIO_PCH_SLP_S3_L) == 0) { /* Power down to next state */ return POWER_S0S3; } break; case POWER_G3S5: /* Enable 3.3V DSW */ gpio_set_level(GPIO_PP3300_DSW_EN, 1); /* * Wait 10ms after +3VALW good, since that powers VccDSW and * VccSUS. */ msleep(10); /* Enable PP5000 (5V) rail as 1.05V and 1.2V rails need 5V * rail to regulate properly. */ gpio_set_level(GPIO_PP5000_EN, 1); /* Wait for PP1050/PP1200 PGOOD to go LOW to * indicate that PP5000 is stable */ while ((power_get_signals() & IN_PGOOD_PP5000) != 0) { if (task_wait_event(SECOND) == TASK_EVENT_TIMER) { CPRINTS("timeout waiting for PP5000"); gpio_set_level(GPIO_PP5000_EN, 0); chipset_force_shutdown(); return POWER_G3; } } /* Turn on 3.3V DSW gated rail for core regulator */ gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 1); /* Assert DPWROK */ gpio_set_level(GPIO_PCH_DPWROK, 1); /* Enable PP1050 rail. */ gpio_set_level(GPIO_PP1050_EN, 1); /* Wait for 1.05V to come up and CPU to notice */ if (power_wait_signals(IN_PGOOD_PP1050 | IN_PCH_SLP_SUS_DEASSERTED)) { gpio_set_level(GPIO_PP1050_EN, 0); gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0); gpio_set_level(GPIO_PP5000_EN, 0); chipset_force_shutdown(); return POWER_G3; } /* Wait 5ms for SUSCLK to stabilize */ msleep(5); /* Call hook to indicate out of G3 state */ hook_notify(HOOK_CHIPSET_PRE_INIT); return POWER_S5; case POWER_S5S3: /* Turn on power to RAM */ gpio_set_level(GPIO_PP1800_EN, 1); gpio_set_level(GPIO_PP1200_EN, 1); if (power_wait_signals(IN_PGOOD_S3)) { gpio_set_level(GPIO_PP1800_EN, 0); gpio_set_level(GPIO_PP1200_EN, 0); chipset_force_shutdown(); return POWER_S5; } /* * Take lightbar out of reset, now that +5VALW is * available and we won't leak +3VALW through the reset * line. */ gpio_set_level(GPIO_LIGHTBAR_RESET_L, 1); /* * Enable touchpad power so it can wake the system from * suspend. */ gpio_set_level(GPIO_ENABLE_TOUCHPAD, 1); /* Turn on USB power rail. */ gpio_set_level(GPIO_PP5000_USB_EN, 1); /* Call hooks now that rails are up */ hook_notify(HOOK_CHIPSET_STARTUP); return POWER_S3; case POWER_S3S0: /* Wait 20ms before allowing VCCST_PGOOD to rise. */ msleep(20); /* Enable wireless. */ wireless_set_state(WIRELESS_ON); /* Make sure the touchscreen is on, too. */ gpio_set_level(GPIO_TOUCHSCREEN_RESET_L, 1); /* Wait for non-core power rails good */ if (power_wait_signals(IN_PGOOD_S0)) { chipset_force_shutdown(); wireless_set_state(WIRELESS_OFF); return POWER_S3; } /* Call hooks now that rails are up */ hook_notify(HOOK_CHIPSET_RESUME); /* * Disable idle task deep sleep. This means that the low * power idle task will not go into deep sleep while in S0. */ disable_sleep(SLEEP_MASK_AP_RUN); /* Wait 99ms after all voltages good */ msleep(99); /* * Throttle CPU if necessary. This should only be asserted * when +VCCP is powered (it is by now). */ gpio_set_level(GPIO_CPU_PROCHOT, throttle_cpu); /* Set PCH_PWROK */ gpio_set_level(GPIO_PCH_PWROK, 1); gpio_set_level(GPIO_SYS_PWROK, 1); return POWER_S0; case POWER_S0S3: /* Call hooks before we remove power rails */ hook_notify(HOOK_CHIPSET_SUSPEND); /* Clear PCH_PWROK */ gpio_set_level(GPIO_SYS_PWROK, 0); gpio_set_level(GPIO_PCH_PWROK, 0); /* Wait 40ns */ udelay(1); /* Suspend wireless */ wireless_set_state(WIRELESS_SUSPEND); /* * Enable idle task deep sleep. Allow the low power idle task * to go into deep sleep in S3 or lower. */ enable_sleep(SLEEP_MASK_AP_RUN); /* * Deassert prochot since CPU is off and we're about to drop * +VCCP. */ gpio_set_level(GPIO_CPU_PROCHOT, 0); return POWER_S3; case POWER_S3S5: /* Call hooks before we remove power rails */ hook_notify(HOOK_CHIPSET_SHUTDOWN); /* Disable wireless */ wireless_set_state(WIRELESS_OFF); /* Disable peripheral power */ gpio_set_level(GPIO_ENABLE_TOUCHPAD, 0); gpio_set_level(GPIO_PP5000_USB_EN, 0); /* Turn off power to RAM */ gpio_set_level(GPIO_PP1800_EN, 0); gpio_set_level(GPIO_PP1200_EN, 0); /* * Put touchscreen and lightbar in reset, so we won't * leak +3VALW through the reset line to chips powered * by +5VALW. * * (Note that we're no longer powering down +5VALW due * to crosbug.com/p/16600, but to minimize side effects * of that change we'll still reset these components in * S5.) */ gpio_set_level(GPIO_TOUCHSCREEN_RESET_L, 0); gpio_set_level(GPIO_LIGHTBAR_RESET_L, 0); return pause_in_s5 ? POWER_S5 : POWER_S5G3; case POWER_S5G3: /* Deassert DPWROK */ gpio_set_level(GPIO_PCH_DPWROK, 0); /* Turn off power rails enabled in S5 */ gpio_set_level(GPIO_PP1050_EN, 0); gpio_set_level(GPIO_PP3300_DSW_GATED_EN, 0); gpio_set_level(GPIO_PP5000_EN, 0); /* Disable 3.3V DSW */ gpio_set_level(GPIO_PP3300_DSW_EN, 0); return POWER_G3; } return state; }