| # Copyright (c) 2014 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. |
| import time |
| |
| import cros_ec_power |
| |
| |
| class crosEcSoftrecPower(cros_ec_power.CrosECPower): |
| |
| """Driver for power_state that uses the EC to trigger recovery. |
| |
| A number of boards (generally, the ARM based boards and some x86 |
| based board) require using the EC to trigger recovery mode. |
| """ |
| |
| _HOSTEVENT_RECOVERY_CMD = dict(rec_on='hostevent set 0x4000', |
| rec_off='hostevent clear 0x4000', |
| rec_off_clearb='hostevent clearb 0x4000', |
| fastboot='hostevent set 0x1000000') |
| # Time in seconds to allow the EC to pick up the recovery |
| # host event. |
| _RECOVERY_DETECTION_DELAY = 1 |
| |
| def _power_on_ap(self): |
| """Power on the AP after initializing recovery state.""" |
| self._interface.power_short_press() |
| |
| def _power_on_bytype(self, rec_mode, rec_type='rec_on'): |
| if rec_mode == self.REC_ON: |
| # Hold warm reset so the AP doesn't boot when EC reboots. |
| self._interface.set('warm_reset', 'on') |
| # Reset the EC to force it back into RO code; this clears |
| # the EC_IN_RW signal, so the system CPU will trust the |
| # upcoming recovery mode request. |
| self._cold_reset() |
| # Restart the EC, but leave the system CPU off... |
| self._interface.set('ec_uart_regexp', 'None') |
| self._interface.set('ec_uart_cmd', 'reboot ap-off') |
| time.sleep(self._reset_recovery_time) |
| # Now the EC keeps the AP off. Release warm reset before powering |
| # on the AP. |
| self._interface.set('warm_reset', 'off') |
| else: |
| # Need to clear the flag in secondary (B) copy of the host events if |
| # we're in non-recovery mode. |
| self._interface.set('ec_uart_cmd', |
| self._HOSTEVENT_RECOVERY_CMD['rec_off_clearb']) |
| |
| # Tell the EC to tell the CPU we're in recovery mode or non-recovery mode. |
| self._interface.set('ec_uart_cmd', self._HOSTEVENT_RECOVERY_CMD[rec_type]) |
| time.sleep(self._RECOVERY_DETECTION_DELAY) |
| self._power_on_ap() |
| |
| def _power_on(self, rec_mode): |
| if rec_mode == self.REC_ON: |
| rec_type='rec_on' |
| else: |
| rec_type='rec_off' |
| |
| self._power_on_bytype(rec_mode, rec_type) |
| |
| def _power_on_fastboot(self): |
| self._power_on_bytype(self.REC_ON, rec_type='fastboot') |
