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 
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 
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 
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 
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 
66 UCLASS_DRIVER(wdt) = {
67 	.id		= UCLASS_WDT,
68 	.name		= "wdt",
69 };
70