summaryrefslogtreecommitdiff
path: root/drivers/core/device-remove.c
blob: efdb0f29058f641837d936389563ceb47543d980 (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
223
224
225
226
227
228
// SPDX-License-Identifier: GPL-2.0+
/*
 * Device manager
 *
 * Copyright (c) 2014 Google, Inc
 *
 * (C) Copyright 2012
 * Pavel Herrmann <morpheus.ibis@gmail.com>
 */

#include <common.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
#include <power-domain.h>

int device_chld_unbind(struct udevice *dev, struct driver *drv)
{
	struct udevice *pos, *n;
	int ret, saved_ret = 0;

	assert(dev);

	list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
		if (drv && (pos->driver != drv))
			continue;

		ret = device_unbind(pos);
		if (ret && !saved_ret) {
			log_warning("device '%s' failed to unbind\n",
				    pos->name);
			saved_ret = ret;
		}
	}

	return log_ret(saved_ret);
}

int device_chld_remove(struct udevice *dev, struct driver *drv,
		       uint flags)
{
	struct udevice *pos, *n;
	int ret;

	assert(dev);

	list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
		if (drv && (pos->driver != drv))
			continue;

		ret = device_remove(pos, flags);
		if (ret)
			return ret;
	}

	return 0;
}

int device_unbind(struct udevice *dev)
{
	const struct driver *drv;
	int ret;

	if (!dev)
		return log_msg_ret("dev", -EINVAL);

	if (dev->flags & DM_FLAG_ACTIVATED)
		return log_msg_ret("active", -EINVAL);

	if (!(dev->flags & DM_FLAG_BOUND))
		return log_msg_ret("not-bound", -EINVAL);

	drv = dev->driver;
	assert(drv);

	if (drv->unbind) {
		ret = drv->unbind(dev);
		if (ret)
			return log_msg_ret("unbind", ret);
	}

	ret = device_chld_unbind(dev, NULL);
	if (ret)
		return log_msg_ret("child unbind", ret);

	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
		free(dev->platdata);
		dev->platdata = NULL;
	}
	if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
		free(dev->uclass_platdata);
		dev->uclass_platdata = NULL;
	}
	if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
		free(dev->parent_platdata);
		dev->parent_platdata = NULL;
	}
	ret = uclass_unbind_device(dev);
	if (ret)
		return log_msg_ret("uc", ret);

	if (dev->parent)
		list_del(&dev->sibling_node);

	devres_release_all(dev);

	if (dev->flags & DM_FLAG_NAME_ALLOCED)
		free((char *)dev->name);
	free(dev);

	return 0;
}

/**
 * device_free() - Free memory buffers allocated by a device
 * @dev:	Device that is to be started
 */
void device_free(struct udevice *dev)
{
	int size;

	if (dev->driver->priv_auto_alloc_size) {
		free(dev->priv);
		dev->priv = NULL;
	}
	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
	if (size) {
		free(dev->uclass_priv);
		dev->uclass_priv = NULL;
	}
	if (dev->parent) {
		size = dev->parent->driver->per_child_auto_alloc_size;
		if (!size) {
			size = dev->parent->uclass->uc_drv->
					per_child_auto_alloc_size;
		}
		if (size) {
			free(dev->parent_priv);
			dev->parent_priv = NULL;
		}
	}
	dev->flags &= ~DM_FLAG_PLATDATA_VALID;

	devres_release_probe(dev);
}

static bool flags_remove(uint flags, uint drv_flags)
{
	if ((flags & DM_REMOVE_NORMAL) ||
	    (flags & (drv_flags & (DM_FLAG_ACTIVE_DMA | DM_FLAG_OS_PREPARE))))
		return true;

	return false;
}

int device_remove(struct udevice *dev, uint flags)
{
	const struct driver *drv;
	int ret;

	if (!dev)
		return -EINVAL;

	if (!(dev->flags & DM_FLAG_ACTIVATED))
		return 0;

	drv = dev->driver;
	assert(drv);

	ret = uclass_pre_remove_device(dev);
	if (ret)
		return ret;

	ret = device_chld_remove(dev, NULL, flags);
	if (ret)
		goto err;

	/*
	 * Remove the device if called with the "normal" remove flag set,
	 * or if the remove flag matches any of the drivers remove flags
	 */
	if (drv->remove && flags_remove(flags, drv->flags)) {
		ret = drv->remove(dev);
		if (ret)
			goto err_remove;
	}

	if (dev->parent && dev->parent->driver->child_post_remove) {
		ret = dev->parent->driver->child_post_remove(dev);
		if (ret) {
			dm_warn("%s: Device '%s' failed child_post_remove()",
				__func__, dev->name);
		}
	}

	if (!(flags & DM_REMOVE_NO_PD) &&
	    !(drv->flags &
	      (DM_FLAG_DEFAULT_PD_CTRL_OFF | DM_FLAG_REMOVE_WITH_PD_ON)) &&
	    dev != gd->cur_serial_dev)
		dev_power_domain_off(dev);

	if (flags_remove(flags, drv->flags)) {
		device_free(dev);

		dev->seq = -1;
		dev->flags &= ~DM_FLAG_ACTIVATED;
	}

	return ret;

err_remove:
	/* We can't put the children back */
	dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
		__func__, dev->name);
err:
	ret = uclass_post_probe_device(dev);
	if (ret) {
		dm_warn("%s: Device '%s' failed to post_probe on error path\n",
			__func__, dev->name);
	}

	return ret;
}