1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 3 #include <device/mmio.h> 4 #include <assert.h> 5 #include <bootstate.h> 6 #include <console/console.h> 7 #include <ec/google/chromeec/ec.h> 8 #include <elog.h> 9 #include <reset.h> 10 #include <symbols.h> 11 12 #include "chromeos.h" 13 14 #define WATCHDOG_TOMBSTONE_MAGIC 0x9d2f41a7 15 elog_handle_watchdog_tombstone(void * unused)16static void elog_handle_watchdog_tombstone(void *unused) 17 { 18 bool flag = false; 19 20 if (CONFIG(CHROMEOS_USE_EC_WATCHDOG_FLAG)) 21 flag |= google_chromeec_get_ap_watchdog_flag(); 22 23 flag |= reset_watchdog_tombstone(); 24 25 if (flag) 26 elog_add_event(ELOG_TYPE_ASYNC_HW_TIMER_EXPIRED); 27 } 28 29 BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_ENTRY, 30 elog_handle_watchdog_tombstone, NULL); 31 reset_watchdog_tombstone(void)32bool reset_watchdog_tombstone(void) 33 { 34 if (!REGION_SIZE(watchdog_tombstone)) 35 return false; 36 37 bool flag = (read32(_watchdog_tombstone) == WATCHDOG_TOMBSTONE_MAGIC); 38 write32(_watchdog_tombstone, 0); 39 return flag; 40 } 41 mark_watchdog_tombstone(void)42void mark_watchdog_tombstone(void) 43 { 44 assert(REGION_SIZE(watchdog_tombstone)); 45 write32(_watchdog_tombstone, WATCHDOG_TOMBSTONE_MAGIC); 46 } 47 reboot_from_watchdog(void)48void reboot_from_watchdog(void) 49 { 50 printk(BIOS_INFO, "Last reset was watchdog, reboot again to reset TPM!\n"); 51 mark_watchdog_tombstone(); 52 board_reset(); 53 } 54