1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2015 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <sysreset.h>
11 #include <asm/state.h>
12 #include <asm/test.h>
13 
14 static int sandbox_warm_sysreset_request(struct udevice *dev,
15 					 enum sysreset_t type)
16 {
17 	struct sandbox_state *state = state_get_current();
18 
19 	switch (type) {
20 	case SYSRESET_WARM:
21 		state->last_sysreset = type;
22 		break;
23 	default:
24 		return -ENOSYS;
25 	}
26 	if (!state->sysreset_allowed[type])
27 		return -EACCES;
28 
29 	return -EINPROGRESS;
30 }
31 
32 int sandbox_warm_sysreset_get_status(struct udevice *dev, char *buf, int size)
33 {
34 	strlcpy(buf, "Reset Status: WARM", size);
35 
36 	return 0;
37 }
38 
39 static int sandbox_sysreset_request(struct udevice *dev, enum sysreset_t type)
40 {
41 	struct sandbox_state *state = state_get_current();
42 
43 	/*
44 	 * If we have a device tree, the device we created from platform data
45 	 * (see the U_BOOT_DEVICE() declaration below) should not do anything.
46 	 * If we are that device, return an error.
47 	 */
48 	if (state->fdt_fname && !dev_of_valid(dev))
49 		return -ENODEV;
50 
51 	switch (type) {
52 	case SYSRESET_COLD:
53 		state->last_sysreset = type;
54 		break;
55 	case SYSRESET_POWER:
56 		state->last_sysreset = type;
57 		if (!state->sysreset_allowed[type])
58 			return -EACCES;
59 		sandbox_exit();
60 		break;
61 	default:
62 		return -ENOSYS;
63 	}
64 	if (!state->sysreset_allowed[type])
65 		return -EACCES;
66 
67 	return -EINPROGRESS;
68 }
69 
70 int sandbox_sysreset_get_status(struct udevice *dev, char *buf, int size)
71 {
72 	strlcpy(buf, "Reset Status: COLD", size);
73 
74 	return 0;
75 }
76 
77 static struct sysreset_ops sandbox_sysreset_ops = {
78 	.request	= sandbox_sysreset_request,
79 	.get_status	= sandbox_sysreset_get_status,
80 };
81 
82 static const struct udevice_id sandbox_sysreset_ids[] = {
83 	{ .compatible = "sandbox,reset" },
84 	{ }
85 };
86 
87 U_BOOT_DRIVER(sysreset_sandbox) = {
88 	.name		= "sysreset_sandbox",
89 	.id		= UCLASS_SYSRESET,
90 	.of_match	= sandbox_sysreset_ids,
91 	.ops		= &sandbox_sysreset_ops,
92 };
93 
94 static struct sysreset_ops sandbox_warm_sysreset_ops = {
95 	.request	= sandbox_warm_sysreset_request,
96 	.get_status	= sandbox_warm_sysreset_get_status,
97 };
98 
99 static const struct udevice_id sandbox_warm_sysreset_ids[] = {
100 	{ .compatible = "sandbox,warm-reset" },
101 	{ }
102 };
103 
104 U_BOOT_DRIVER(warm_sysreset_sandbox) = {
105 	.name		= "warm_sysreset_sandbox",
106 	.id		= UCLASS_SYSRESET,
107 	.of_match	= sandbox_warm_sysreset_ids,
108 	.ops		= &sandbox_warm_sysreset_ops,
109 };
110 
111 /* This is here in case we don't have a device tree */
112 U_BOOT_DEVICE(sysreset_sandbox_non_fdt) = {
113 	.name = "sysreset_sandbox",
114 };
115