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 int sandbox_warm_sysreset_get_last(struct udevice *dev)
40 {
41 	return SYSRESET_WARM;
42 }
43 
44 static int sandbox_sysreset_request(struct udevice *dev, enum sysreset_t type)
45 {
46 	struct sandbox_state *state = state_get_current();
47 
48 	/*
49 	 * If we have a device tree, the device we created from platform data
50 	 * (see the U_BOOT_DEVICE() declaration below) should not do anything.
51 	 * If we are that device, return an error.
52 	 */
53 	if (state->fdt_fname && !dev_of_valid(dev))
54 		return -ENODEV;
55 
56 	switch (type) {
57 	case SYSRESET_COLD:
58 		state->last_sysreset = type;
59 		break;
60 	case SYSRESET_POWER:
61 		state->last_sysreset = type;
62 		if (!state->sysreset_allowed[type])
63 			return -EACCES;
64 		sandbox_exit();
65 		break;
66 	case SYSRESET_POWER_OFF:
67 		if (!state->sysreset_allowed[type])
68 			return -EACCES;
69 	default:
70 		return -ENOSYS;
71 	}
72 	if (!state->sysreset_allowed[type])
73 		return -EACCES;
74 
75 	return -EINPROGRESS;
76 }
77 
78 int sandbox_sysreset_get_status(struct udevice *dev, char *buf, int size)
79 {
80 	strlcpy(buf, "Reset Status: COLD", size);
81 
82 	return 0;
83 }
84 
85 int sandbox_sysreset_get_last(struct udevice *dev)
86 {
87 	struct sandbox_state *state = state_get_current();
88 
89 	/*
90 	 * The first phase is a power reset, after that we assume we don't
91 	 * know.
92 	 */
93 	return state->jumped_fname ? SYSRESET_WARM : SYSRESET_POWER;
94 }
95 
96 static struct sysreset_ops sandbox_sysreset_ops = {
97 	.request	= sandbox_sysreset_request,
98 	.get_status	= sandbox_sysreset_get_status,
99 	.get_last	= sandbox_sysreset_get_last,
100 };
101 
102 static const struct udevice_id sandbox_sysreset_ids[] = {
103 	{ .compatible = "sandbox,reset" },
104 	{ }
105 };
106 
107 U_BOOT_DRIVER(sysreset_sandbox) = {
108 	.name		= "sysreset_sandbox",
109 	.id		= UCLASS_SYSRESET,
110 	.of_match	= sandbox_sysreset_ids,
111 	.ops		= &sandbox_sysreset_ops,
112 };
113 
114 static struct sysreset_ops sandbox_warm_sysreset_ops = {
115 	.request	= sandbox_warm_sysreset_request,
116 	.get_status	= sandbox_warm_sysreset_get_status,
117 	.get_last	= sandbox_warm_sysreset_get_last,
118 };
119 
120 static const struct udevice_id sandbox_warm_sysreset_ids[] = {
121 	{ .compatible = "sandbox,warm-reset" },
122 	{ }
123 };
124 
125 U_BOOT_DRIVER(warm_sysreset_sandbox) = {
126 	.name		= "warm_sysreset_sandbox",
127 	.id		= UCLASS_SYSRESET,
128 	.of_match	= sandbox_warm_sysreset_ids,
129 	.ops		= &sandbox_warm_sysreset_ops,
130 };
131 
132 /* This is here in case we don't have a device tree */
133 U_BOOT_DEVICE(sysreset_sandbox_non_fdt) = {
134 	.name = "sysreset_sandbox",
135 };
136