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 <asm/state.h>
10 #include <wdt.h>
11 
12 DECLARE_GLOBAL_DATA_PTR;
13 
14 static int sandbox_wdt_start(struct udevice *dev, u64 timeout, ulong flags)
15 {
16 	struct sandbox_state *state = state_get_current();
17 
18 	state->wdt.counter = timeout;
19 	state->wdt.running = true;
20 
21 	return 0;
22 }
23 
24 static int sandbox_wdt_stop(struct udevice *dev)
25 {
26 	struct sandbox_state *state = state_get_current();
27 
28 	state->wdt.running = false;
29 
30 	return 0;
31 }
32 
33 static int sandbox_wdt_reset(struct udevice *dev)
34 {
35 	struct sandbox_state *state = state_get_current();
36 
37 	state->wdt.reset_count++;
38 
39 	return 0;
40 }
41 
42 static int sandbox_wdt_expire_now(struct udevice *dev, ulong flags)
43 {
44 	sandbox_wdt_start(dev, 1, flags);
45 
46 	return 0;
47 }
48 
49 static int sandbox_wdt_probe(struct udevice *dev)
50 {
51 	struct sandbox_state *state = state_get_current();
52 
53 	memset(&state->wdt, 0, sizeof(state->wdt));
54 
55 	return 0;
56 }
57 
58 static const struct wdt_ops sandbox_wdt_ops = {
59 	.start = sandbox_wdt_start,
60 	.reset = sandbox_wdt_reset,
61 	.stop = sandbox_wdt_stop,
62 	.expire_now = sandbox_wdt_expire_now,
63 };
64 
65 static const struct udevice_id sandbox_wdt_ids[] = {
66 	{ .compatible = "sandbox,wdt" },
67 	{}
68 };
69 
70 U_BOOT_DRIVER(wdt_sandbox) = {
71 	.name = "wdt_sandbox",
72 	.id = UCLASS_WDT,
73 	.of_match = sandbox_wdt_ids,
74 	.ops = &sandbox_wdt_ops,
75 	.probe = sandbox_wdt_probe,
76 };
77