| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <device/mmio.h> |
| #include <assert.h> |
| #include <bootstate.h> |
| #include <console/console.h> |
| #include <ec/google/chromeec/ec.h> |
| #include <elog.h> |
| #include <reset.h> |
| #include <symbols.h> |
| |
| #include "chromeos.h" |
| |
| #define WATCHDOG_TOMBSTONE_MAGIC 0x9d2f41a7 |
| |
| static void elog_handle_watchdog_tombstone(void *unused) |
| { |
| bool flag = false; |
| |
| if (CONFIG(CHROMEOS_USE_EC_WATCHDOG_FLAG)) |
| flag |= google_chromeec_get_ap_watchdog_flag(); |
| |
| flag |= reset_watchdog_tombstone(); |
| |
| if (flag) |
| elog_add_event(ELOG_TYPE_ASYNC_HW_TIMER_EXPIRED); |
| } |
| |
| BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_ENTRY, |
| elog_handle_watchdog_tombstone, NULL); |
| |
| bool reset_watchdog_tombstone(void) |
| { |
| if (!REGION_SIZE(watchdog_tombstone)) |
| return false; |
| |
| bool flag = (read32(_watchdog_tombstone) == WATCHDOG_TOMBSTONE_MAGIC); |
| write32(_watchdog_tombstone, 0); |
| return flag; |
| } |
| |
| void mark_watchdog_tombstone(void) |
| { |
| assert(REGION_SIZE(watchdog_tombstone)); |
| write32(_watchdog_tombstone, WATCHDOG_TOMBSTONE_MAGIC); |
| } |
| |
| void reboot_from_watchdog(void) |
| { |
| printk(BIOS_INFO, "Last reset was watchdog, reboot again to reset TPM!\n"); |
| mark_watchdog_tombstone(); |
| board_reset(); |
| } |