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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 };