aboutsummaryrefslogtreecommitdiff
path: root/drivers/reset/reset-uclass.c
blob: 05879c6ada6041d2e8bbb7572464011430698ff6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
 * Copyright (c) 2016, NVIDIA CORPORATION.
 *
 * SPDX-License-Identifier: GPL-2.0
 */

#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <reset.h>
#include <reset-uclass.h>

static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
{
	return (struct reset_ops *)dev->driver->ops;
}

static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
				  struct ofnode_phandle_args *args)
{
	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);

	if (args->args_count != 1) {
		debug("Invaild args_count: %d\n", args->args_count);
		return -EINVAL;
	}

	reset_ctl->id = args->args[0];

	return 0;
}

int reset_get_by_index(struct udevice *dev, int index,
		       struct reset_ctl *reset_ctl)
{
	struct ofnode_phandle_args args;
	int ret;
	struct udevice *dev_reset;
	struct reset_ops *ops;

	debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index,
	      reset_ctl);
	reset_ctl->dev = NULL;

	ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
					  index, &args);
	if (ret) {
		debug("%s: fdtdec_parse_phandle_with_args() failed: %d\n",
		      __func__, ret);
		return ret;
	}

	ret = uclass_get_device_by_ofnode(UCLASS_RESET, args.node,
					  &dev_reset);
	if (ret) {
		debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
		      __func__, ret);
		debug("%s %d\n", ofnode_get_name(args.node), args.args[0]);
		return ret;
	}
	ops = reset_dev_ops(dev_reset);

	reset_ctl->dev = dev_reset;
	if (ops->of_xlate)
		ret = ops->of_xlate(reset_ctl, &args);
	else
		ret = reset_of_xlate_default(reset_ctl, &args);
	if (ret) {
		debug("of_xlate() failed: %d\n", ret);
		return ret;
	}

	ret = ops->request(reset_ctl);
	if (ret) {
		debug("ops->request() failed: %d\n", ret);
		return ret;
	}

	return 0;
}

int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
{
	int i, ret, err, count;
	
	bulk->count = 0;

	count = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
	if (count < 1)
		return count;

	bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
				    GFP_KERNEL);
	if (!bulk->resets)
		return -ENOMEM;

	for (i = 0; i < count; i++) {
		ret = reset_get_by_index(dev, i, &bulk->resets[i]);
		if (ret < 0)
			goto bulk_get_err;

		++bulk->count;
	}

	return 0;

bulk_get_err:
	err = reset_release_all(bulk->resets, bulk->count);
	if (err)
		debug("%s: could release all resets for %p\n",
		      __func__, dev);

	return ret;
}

int reset_get_by_name(struct udevice *dev, const char *name,
		     struct reset_ctl *reset_ctl)
{
	int index;

	debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
	      reset_ctl);
	reset_ctl->dev = NULL;

	index = dev_read_stringlist_search(dev, "reset-names", name);
	if (index < 0) {
		debug("fdt_stringlist_search() failed: %d\n", index);
		return index;
	}

	return reset_get_by_index(dev, index, reset_ctl);
}

int reset_request(struct reset_ctl *reset_ctl)
{
	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);

	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);

	return ops->request(reset_ctl);
}

int reset_free(struct reset_ctl *reset_ctl)
{
	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);

	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);

	return ops->free(reset_ctl);
}

int reset_assert(struct reset_ctl *reset_ctl)
{
	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);

	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);

	return ops->rst_assert(reset_ctl);
}

int reset_assert_bulk(struct reset_ctl_bulk *bulk)
{
	int i, ret;

	for (i = 0; i < bulk->count; i++) {
		ret = reset_assert(&bulk->resets[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

int reset_deassert(struct reset_ctl *reset_ctl)
{
	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);

	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);

	return ops->rst_deassert(reset_ctl);
}

int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
{
	int i, ret;

	for (i = 0; i < bulk->count; i++) {
		ret = reset_deassert(&bulk->resets[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

int reset_release_all(struct reset_ctl *reset_ctl, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);

		/* check if reset has been previously requested */
		if (!reset_ctl[i].dev)
			continue;

		ret = reset_assert(&reset_ctl[i]);
		if (ret)
			return ret;

		ret = reset_free(&reset_ctl[i]);
		if (ret)
			return ret;
	}

	return 0;
}

UCLASS_DRIVER(reset) = {
	.id		= UCLASS_RESET,
	.name		= "reset",
};