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1 | /* | |
2 | * Copyright (c) 2013 Google, Inc | |
3 | * | |
4 | * (C) Copyright 2012 | |
5 | * Pavel Herrmann <morpheus.ibis@gmail.com> | |
6 | * | |
7 | * SPDX-License-Identifier: GPL-2.0+ | |
8 | */ | |
9 | ||
10 | #include <common.h> | |
11 | #include <errno.h> | |
12 | #include <fdtdec.h> | |
13 | #include <malloc.h> | |
14 | #include <libfdt.h> | |
15 | #include <dm/device.h> | |
16 | #include <dm/device-internal.h> | |
17 | #include <dm/lists.h> | |
18 | #include <dm/platdata.h> | |
19 | #include <dm/root.h> | |
20 | #include <dm/uclass.h> | |
21 | #include <dm/util.h> | |
22 | #include <linux/list.h> | |
23 | ||
24 | DECLARE_GLOBAL_DATA_PTR; | |
25 | ||
26 | struct root_priv { | |
27 | fdt_addr_t translation_offset; /* optional translation offset */ | |
28 | }; | |
29 | ||
30 | static const struct driver_info root_info = { | |
31 | .name = "root_driver", | |
32 | }; | |
33 | ||
34 | struct udevice *dm_root(void) | |
35 | { | |
36 | if (!gd->dm_root) { | |
37 | dm_warn("Virtual root driver does not exist!\n"); | |
38 | return NULL; | |
39 | } | |
40 | ||
41 | return gd->dm_root; | |
42 | } | |
43 | ||
44 | void dm_fixup_for_gd_move(struct global_data *new_gd) | |
45 | { | |
46 | /* The sentinel node has moved, so update things that point to it */ | |
47 | new_gd->uclass_root.next->prev = &new_gd->uclass_root; | |
48 | new_gd->uclass_root.prev->next = &new_gd->uclass_root; | |
49 | } | |
50 | ||
51 | fdt_addr_t dm_get_translation_offset(void) | |
52 | { | |
53 | struct udevice *root = dm_root(); | |
54 | struct root_priv *priv = dev_get_priv(root); | |
55 | ||
56 | return priv->translation_offset; | |
57 | } | |
58 | ||
59 | void dm_set_translation_offset(fdt_addr_t offs) | |
60 | { | |
61 | struct udevice *root = dm_root(); | |
62 | struct root_priv *priv = dev_get_priv(root); | |
63 | ||
64 | priv->translation_offset = offs; | |
65 | } | |
66 | ||
67 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) | |
68 | void fix_drivers(void) | |
69 | { | |
70 | struct driver *drv = | |
71 | ll_entry_start(struct driver, driver); | |
72 | const int n_ents = ll_entry_count(struct driver, driver); | |
73 | struct driver *entry; | |
74 | ||
75 | for (entry = drv; entry != drv + n_ents; entry++) { | |
76 | if (entry->of_match) | |
77 | entry->of_match = (const struct udevice_id *) | |
78 | ((u32)entry->of_match + gd->reloc_off); | |
79 | if (entry->bind) | |
80 | entry->bind += gd->reloc_off; | |
81 | if (entry->probe) | |
82 | entry->probe += gd->reloc_off; | |
83 | if (entry->remove) | |
84 | entry->remove += gd->reloc_off; | |
85 | if (entry->unbind) | |
86 | entry->unbind += gd->reloc_off; | |
87 | if (entry->ofdata_to_platdata) | |
88 | entry->ofdata_to_platdata += gd->reloc_off; | |
89 | if (entry->child_post_bind) | |
90 | entry->child_post_bind += gd->reloc_off; | |
91 | if (entry->child_pre_probe) | |
92 | entry->child_pre_probe += gd->reloc_off; | |
93 | if (entry->child_post_remove) | |
94 | entry->child_post_remove += gd->reloc_off; | |
95 | /* OPS are fixed in every uclass post_probe function */ | |
96 | if (entry->ops) | |
97 | entry->ops += gd->reloc_off; | |
98 | } | |
99 | } | |
100 | ||
101 | void fix_uclass(void) | |
102 | { | |
103 | struct uclass_driver *uclass = | |
104 | ll_entry_start(struct uclass_driver, uclass); | |
105 | const int n_ents = ll_entry_count(struct uclass_driver, uclass); | |
106 | struct uclass_driver *entry; | |
107 | ||
108 | for (entry = uclass; entry != uclass + n_ents; entry++) { | |
109 | if (entry->post_bind) | |
110 | entry->post_bind += gd->reloc_off; | |
111 | if (entry->pre_unbind) | |
112 | entry->pre_unbind += gd->reloc_off; | |
113 | if (entry->pre_probe) | |
114 | entry->pre_probe += gd->reloc_off; | |
115 | if (entry->post_probe) | |
116 | entry->post_probe += gd->reloc_off; | |
117 | if (entry->pre_remove) | |
118 | entry->pre_remove += gd->reloc_off; | |
119 | if (entry->child_post_bind) | |
120 | entry->child_post_bind += gd->reloc_off; | |
121 | if (entry->child_pre_probe) | |
122 | entry->child_pre_probe += gd->reloc_off; | |
123 | if (entry->init) | |
124 | entry->init += gd->reloc_off; | |
125 | if (entry->destroy) | |
126 | entry->destroy += gd->reloc_off; | |
127 | /* FIXME maybe also need to fix these ops */ | |
128 | if (entry->ops) | |
129 | entry->ops += gd->reloc_off; | |
130 | } | |
131 | } | |
132 | ||
133 | void fix_devices(void) | |
134 | { | |
135 | struct driver_info *dev = | |
136 | ll_entry_start(struct driver_info, driver_info); | |
137 | const int n_ents = ll_entry_count(struct driver_info, driver_info); | |
138 | struct driver_info *entry; | |
139 | ||
140 | for (entry = dev; entry != dev + n_ents; entry++) { | |
141 | if (entry->platdata) | |
142 | entry->platdata += gd->reloc_off; | |
143 | } | |
144 | } | |
145 | ||
146 | #endif | |
147 | ||
148 | int dm_init(void) | |
149 | { | |
150 | int ret; | |
151 | ||
152 | if (gd->dm_root) { | |
153 | dm_warn("Virtual root driver already exists!\n"); | |
154 | return -EINVAL; | |
155 | } | |
156 | INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST); | |
157 | ||
158 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) | |
159 | fix_drivers(); | |
160 | fix_uclass(); | |
161 | fix_devices(); | |
162 | #endif | |
163 | ||
164 | ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST); | |
165 | if (ret) | |
166 | return ret; | |
167 | #if CONFIG_IS_ENABLED(OF_CONTROL) | |
168 | DM_ROOT_NON_CONST->of_offset = 0; | |
169 | #endif | |
170 | ret = device_probe(DM_ROOT_NON_CONST); | |
171 | if (ret) | |
172 | return ret; | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | int dm_uninit(void) | |
178 | { | |
179 | device_remove(dm_root()); | |
180 | device_unbind(dm_root()); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | int dm_scan_platdata(bool pre_reloc_only) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); | |
190 | if (ret == -ENOENT) { | |
191 | dm_warn("Some drivers were not found\n"); | |
192 | ret = 0; | |
193 | } | |
194 | ||
195 | return ret; | |
196 | } | |
197 | ||
198 | #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) | |
199 | int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset, | |
200 | bool pre_reloc_only) | |
201 | { | |
202 | int ret = 0, err; | |
203 | ||
204 | for (offset = fdt_first_subnode(blob, offset); | |
205 | offset > 0; | |
206 | offset = fdt_next_subnode(blob, offset)) { | |
207 | if (pre_reloc_only && | |
208 | !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL)) | |
209 | continue; | |
210 | if (!fdtdec_get_is_enabled(blob, offset)) { | |
211 | dm_dbg(" - ignoring disabled device\n"); | |
212 | continue; | |
213 | } | |
214 | err = lists_bind_fdt(parent, blob, offset, NULL); | |
215 | if (err && !ret) { | |
216 | ret = err; | |
217 | debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL), | |
218 | ret); | |
219 | } | |
220 | } | |
221 | ||
222 | if (ret) | |
223 | dm_warn("Some drivers failed to bind\n"); | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | int dm_scan_fdt_dev(struct udevice *dev) | |
229 | { | |
230 | if (dev_of_offset(dev) == -1) | |
231 | return 0; | |
232 | ||
233 | return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev), | |
234 | gd->flags & GD_FLG_RELOC ? false : true); | |
235 | } | |
236 | ||
237 | int dm_scan_fdt(const void *blob, bool pre_reloc_only) | |
238 | { | |
239 | return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); | |
240 | } | |
241 | #endif | |
242 | ||
243 | __weak int dm_scan_other(bool pre_reloc_only) | |
244 | { | |
245 | return 0; | |
246 | } | |
247 | ||
248 | int dm_init_and_scan(bool pre_reloc_only) | |
249 | { | |
250 | int ret; | |
251 | ||
252 | ret = dm_init(); | |
253 | if (ret) { | |
254 | debug("dm_init() failed: %d\n", ret); | |
255 | return ret; | |
256 | } | |
257 | ret = dm_scan_platdata(pre_reloc_only); | |
258 | if (ret) { | |
259 | debug("dm_scan_platdata() failed: %d\n", ret); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) { | |
264 | ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); | |
265 | if (ret) { | |
266 | debug("dm_scan_fdt() failed: %d\n", ret); | |
267 | return ret; | |
268 | } | |
269 | } | |
270 | ||
271 | ret = dm_scan_other(pre_reloc_only); | |
272 | if (ret) | |
273 | return ret; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | /* This is the root driver - all drivers are children of this */ | |
279 | U_BOOT_DRIVER(root_driver) = { | |
280 | .name = "root_driver", | |
281 | .id = UCLASS_ROOT, | |
282 | .priv_auto_alloc_size = sizeof(struct root_priv), | |
283 | }; | |
284 | ||
285 | /* This is the root uclass */ | |
286 | UCLASS_DRIVER(root) = { | |
287 | .name = "root", | |
288 | .id = UCLASS_ROOT, | |
289 | }; |