1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2017 Google, Inc
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <errno.h>
9 #include <wdt.h>
10 #include <dm/device-internal.h>
11 #include <dm/lists.h>
12
wdt_start(struct udevice * dev,u64 timeout_ms,ulong flags)13 int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
14 {
15 const struct wdt_ops *ops = device_get_ops(dev);
16
17 if (!ops->start)
18 return -ENOSYS;
19
20 return ops->start(dev, timeout_ms, flags);
21 }
22
wdt_stop(struct udevice * dev)23 int wdt_stop(struct udevice *dev)
24 {
25 const struct wdt_ops *ops = device_get_ops(dev);
26
27 if (!ops->stop)
28 return -ENOSYS;
29
30 return ops->stop(dev);
31 }
32
wdt_reset(struct udevice * dev)33 int wdt_reset(struct udevice *dev)
34 {
35 const struct wdt_ops *ops = device_get_ops(dev);
36
37 if (!ops->reset)
38 return -ENOSYS;
39
40 return ops->reset(dev);
41 }
42
wdt_expire_now(struct udevice * dev,ulong flags)43 int wdt_expire_now(struct udevice *dev, ulong flags)
44 {
45 int ret = 0;
46 const struct wdt_ops *ops;
47
48 debug("WDT Resetting: %lu\n", flags);
49 ops = device_get_ops(dev);
50 if (ops->expire_now) {
51 return ops->expire_now(dev, flags);
52 } else {
53 if (!ops->start)
54 return -ENOSYS;
55
56 ret = ops->start(dev, 1, flags);
57 if (ret < 0)
58 return ret;
59
60 hang();
61 }
62
63 return ret;
64 }
65
wdt_post_bind(struct udevice * dev)66 static int wdt_post_bind(struct udevice *dev)
67 {
68 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
69 struct wdt_ops *ops = (struct wdt_ops *)device_get_ops(dev);
70 static int reloc_done;
71
72 if (!reloc_done) {
73 if (ops->start)
74 ops->start += gd->reloc_off;
75 if (ops->stop)
76 ops->stop += gd->reloc_off;
77 if (ops->reset)
78 ops->reset += gd->reloc_off;
79 if (ops->expire_now)
80 ops->expire_now += gd->reloc_off;
81
82 reloc_done++;
83 }
84 #endif
85 return 0;
86 }
87
88 UCLASS_DRIVER(wdt) = {
89 .id = UCLASS_WDT,
90 .name = "watchdog",
91 .flags = DM_UC_FLAG_SEQ_ALIAS,
92 .post_bind = wdt_post_bind,
93 };
94