1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2017 Intel Corporation
4 */
5 #include <common.h>
6 #include <watchdog.h>
7 #include <asm/scu.h>
8
9 /* Hardware timeout in seconds */
10 #define WDT_PRETIMEOUT 15
11 #define WDT_TIMEOUT_MIN (1 + WDT_PRETIMEOUT)
12 #define WDT_TIMEOUT_MAX 170
13 #define WDT_DEFAULT_TIMEOUT 90
14
15 #ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS
16 #define WATCHDOG_HEARTBEAT 60000
17 #else
18 #define WATCHDOG_HEARTBEAT CONFIG_WATCHDOG_TIMEOUT_MSECS
19 #endif
20
21 enum {
22 SCU_WATCHDOG_START = 0,
23 SCU_WATCHDOG_STOP = 1,
24 SCU_WATCHDOG_KEEPALIVE = 2,
25 SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT = 3,
26 };
27
hw_watchdog_reset(void)28 void hw_watchdog_reset(void)
29 {
30 static unsigned long last;
31 unsigned long now;
32
33 if (gd->timer)
34 now = timer_get_us();
35 else
36 now = rdtsc() / 1000;
37
38 /* Do not flood SCU */
39 if (last > now)
40 last = 0;
41
42 if (unlikely((now - last) > (WDT_PRETIMEOUT / 2) * 1000000)) {
43 last = now;
44 scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
45 }
46 }
47
hw_watchdog_disable(void)48 int hw_watchdog_disable(void)
49 {
50 return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
51 }
52
hw_watchdog_init(void)53 void hw_watchdog_init(void)
54 {
55 u32 timeout = WATCHDOG_HEARTBEAT / 1000;
56 int in_size;
57 struct ipc_wd_start {
58 u32 pretimeout;
59 u32 timeout;
60 } ipc_wd_start = { timeout - WDT_PRETIMEOUT, timeout };
61
62 /*
63 * SCU expects the input size for watchdog IPC
64 * to be based on 4 bytes
65 */
66 in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
67
68 scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
69 (u32 *)&ipc_wd_start, in_size, NULL, 0);
70 }
71