1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016, NVIDIA CORPORATION.
4 */
5
6 #include <dm.h>
7 #include <log.h>
8 #include <malloc.h>
9 #include <reset-uclass.h>
10 #include <asm/io.h>
11 #include <asm/reset.h>
12
13 #define SANDBOX_RESET_SIGNALS 101
14
15 struct sandbox_reset_signal {
16 bool asserted;
17 bool requested;
18 };
19
20 struct sandbox_reset {
21 struct sandbox_reset_signal signals[SANDBOX_RESET_SIGNALS];
22 };
23
sandbox_reset_request(struct reset_ctl * reset_ctl)24 static int sandbox_reset_request(struct reset_ctl *reset_ctl)
25 {
26 struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
27
28 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
29
30 if (reset_ctl->id >= SANDBOX_RESET_SIGNALS)
31 return -EINVAL;
32
33 sbr->signals[reset_ctl->id].requested = true;
34 return 0;
35 }
36
sandbox_reset_free(struct reset_ctl * reset_ctl)37 static int sandbox_reset_free(struct reset_ctl *reset_ctl)
38 {
39 struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
40
41 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
42
43 sbr->signals[reset_ctl->id].requested = false;
44 return 0;
45 }
46
sandbox_reset_assert(struct reset_ctl * reset_ctl)47 static int sandbox_reset_assert(struct reset_ctl *reset_ctl)
48 {
49 struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
50
51 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
52
53 sbr->signals[reset_ctl->id].asserted = true;
54
55 return 0;
56 }
57
sandbox_reset_deassert(struct reset_ctl * reset_ctl)58 static int sandbox_reset_deassert(struct reset_ctl *reset_ctl)
59 {
60 struct sandbox_reset *sbr = dev_get_priv(reset_ctl->dev);
61
62 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
63
64 sbr->signals[reset_ctl->id].asserted = false;
65
66 return 0;
67 }
68
sandbox_reset_bind(struct udevice * dev)69 static int sandbox_reset_bind(struct udevice *dev)
70 {
71 debug("%s(dev=%p)\n", __func__, dev);
72
73 return 0;
74 }
75
sandbox_reset_probe(struct udevice * dev)76 static int sandbox_reset_probe(struct udevice *dev)
77 {
78 debug("%s(dev=%p)\n", __func__, dev);
79
80 return 0;
81 }
82
83 static const struct udevice_id sandbox_reset_ids[] = {
84 { .compatible = "sandbox,reset-ctl" },
85 { }
86 };
87
88 struct reset_ops sandbox_reset_reset_ops = {
89 .request = sandbox_reset_request,
90 .rfree = sandbox_reset_free,
91 .rst_assert = sandbox_reset_assert,
92 .rst_deassert = sandbox_reset_deassert,
93 };
94
95 U_BOOT_DRIVER(sandbox_reset) = {
96 .name = "sandbox_reset",
97 .id = UCLASS_RESET,
98 .of_match = sandbox_reset_ids,
99 .bind = sandbox_reset_bind,
100 .probe = sandbox_reset_probe,
101 .priv_auto = sizeof(struct sandbox_reset),
102 .ops = &sandbox_reset_reset_ops,
103 };
104
sandbox_reset_query(struct udevice * dev,unsigned long id)105 int sandbox_reset_query(struct udevice *dev, unsigned long id)
106 {
107 struct sandbox_reset *sbr = dev_get_priv(dev);
108
109 debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
110
111 if (id >= SANDBOX_RESET_SIGNALS)
112 return -EINVAL;
113
114 return sbr->signals[id].asserted;
115 }
116
sandbox_reset_is_requested(struct udevice * dev,unsigned long id)117 int sandbox_reset_is_requested(struct udevice *dev, unsigned long id)
118 {
119 struct sandbox_reset *sbr = dev_get_priv(dev);
120
121 debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
122
123 if (id >= SANDBOX_RESET_SIGNALS)
124 return -EINVAL;
125
126 return sbr->signals[id].requested;
127 }
128