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