1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2017 Intel Corporation
9 /* Hardware timeout in seconds */
10 #define WDT_PRETIMEOUT 15
11 #define WDT_TIMEOUT_MIN (1 + WDT_PRETIMEOUT)
12 #define WDT_TIMEOUT_MAX 170
15 * Note, firmware chooses 90 seconds as a default timeout for watchdog on
16 * Intel Tangier SoC. It means that without handling it in the running code
17 * the reboot will happen.
20 #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
21 #define WATCHDOG_HEARTBEAT 60000
23 #define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS
27 SCU_WATCHDOG_START = 0,
28 SCU_WATCHDOG_STOP = 1,
29 SCU_WATCHDOG_KEEPALIVE = 2,
30 SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
33 void hw_watchdog_reset(void)
35 static unsigned long last;
43 /* Do not flood SCU */
47 if (unlikely((now - last) > (WDT_PRETIMEOUT / 2) * 1000000)) {
49 scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
53 int hw_watchdog_disable(void)
55 return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
58 void hw_watchdog_init(void)
60 u32 timeout = WATCHDOG_HEARTBEAT / 1000;
65 } ipc_wd_start = { timeout - WDT_PRETIMEOUT, timeout };
68 * SCU expects the input size for watchdog IPC
69 * to be based on 4 bytes
71 in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
73 scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
74 (u32 *)&ipc_wd_start, in_size, NULL, 0);