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[u-boot] / drivers / core / root.c
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 fdt_addr_t dm_get_translation_offset(void)
45 {
46         struct udevice *root = dm_root();
47         struct root_priv *priv = dev_get_priv(root);
48
49         return priv->translation_offset;
50 }
51
52 void dm_set_translation_offset(fdt_addr_t offs)
53 {
54         struct udevice *root = dm_root();
55         struct root_priv *priv = dev_get_priv(root);
56
57         priv->translation_offset = offs;
58 }
59
60 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
61 void fix_drivers(void)
62 {
63         struct driver *drv =
64                 ll_entry_start(struct driver, driver);
65         const int n_ents = ll_entry_count(struct driver, driver);
66         struct driver *entry;
67
68         for (entry = drv; entry != drv + n_ents; entry++) {
69                 if (entry->of_match)
70                         entry->of_match = (const struct udevice_id *)
71                                 ((u32)entry->of_match + gd->reloc_off);
72                 if (entry->bind)
73                         entry->bind += gd->reloc_off;
74                 if (entry->probe)
75                         entry->probe += gd->reloc_off;
76                 if (entry->remove)
77                         entry->remove += gd->reloc_off;
78                 if (entry->unbind)
79                         entry->unbind += gd->reloc_off;
80                 if (entry->ofdata_to_platdata)
81                         entry->ofdata_to_platdata += gd->reloc_off;
82                 if (entry->child_post_bind)
83                         entry->child_post_bind += gd->reloc_off;
84                 if (entry->child_pre_probe)
85                         entry->child_pre_probe += gd->reloc_off;
86                 if (entry->child_post_remove)
87                         entry->child_post_remove += gd->reloc_off;
88                 /* OPS are fixed in every uclass post_probe function */
89                 if (entry->ops)
90                         entry->ops += gd->reloc_off;
91         }
92 }
93
94 void fix_uclass(void)
95 {
96         struct uclass_driver *uclass =
97                 ll_entry_start(struct uclass_driver, uclass);
98         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
99         struct uclass_driver *entry;
100
101         for (entry = uclass; entry != uclass + n_ents; entry++) {
102                 if (entry->post_bind)
103                         entry->post_bind += gd->reloc_off;
104                 if (entry->pre_unbind)
105                         entry->pre_unbind += gd->reloc_off;
106                 if (entry->pre_probe)
107                         entry->pre_probe += gd->reloc_off;
108                 if (entry->post_probe)
109                         entry->post_probe += gd->reloc_off;
110                 if (entry->pre_remove)
111                         entry->pre_remove += gd->reloc_off;
112                 if (entry->child_post_bind)
113                         entry->child_post_bind += gd->reloc_off;
114                 if (entry->child_pre_probe)
115                         entry->child_pre_probe += gd->reloc_off;
116                 if (entry->init)
117                         entry->init += gd->reloc_off;
118                 if (entry->destroy)
119                         entry->destroy += gd->reloc_off;
120                 /* FIXME maybe also need to fix these ops */
121                 if (entry->ops)
122                         entry->ops += gd->reloc_off;
123         }
124 }
125
126 void fix_devices(void)
127 {
128         struct driver_info *dev =
129                 ll_entry_start(struct driver_info, driver_info);
130         const int n_ents = ll_entry_count(struct driver_info, driver_info);
131         struct driver_info *entry;
132
133         for (entry = dev; entry != dev + n_ents; entry++) {
134                 if (entry->platdata)
135                         entry->platdata += gd->reloc_off;
136         }
137 }
138
139 #endif
140
141 int dm_init(void)
142 {
143         int ret;
144
145         if (gd->dm_root) {
146                 dm_warn("Virtual root driver already exists!\n");
147                 return -EINVAL;
148         }
149         INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
150
151 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
152         fix_drivers();
153         fix_uclass();
154         fix_devices();
155 #endif
156
157         ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
158         if (ret)
159                 return ret;
160 #if CONFIG_IS_ENABLED(OF_CONTROL)
161         DM_ROOT_NON_CONST->of_offset = 0;
162 #endif
163         ret = device_probe(DM_ROOT_NON_CONST);
164         if (ret)
165                 return ret;
166
167         return 0;
168 }
169
170 int dm_uninit(void)
171 {
172         device_remove(dm_root());
173         device_unbind(dm_root());
174
175         return 0;
176 }
177
178 int dm_scan_platdata(bool pre_reloc_only)
179 {
180         int ret;
181
182         ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
183         if (ret == -ENOENT) {
184                 dm_warn("Some drivers were not found\n");
185                 ret = 0;
186         }
187
188         return ret;
189 }
190
191 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
192 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
193                      bool pre_reloc_only)
194 {
195         int ret = 0, err;
196
197         for (offset = fdt_first_subnode(blob, offset);
198              offset > 0;
199              offset = fdt_next_subnode(blob, offset)) {
200                 if (pre_reloc_only &&
201                     !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
202                         continue;
203                 if (!fdtdec_get_is_enabled(blob, offset)) {
204                         dm_dbg("   - ignoring disabled device\n");
205                         continue;
206                 }
207                 err = lists_bind_fdt(parent, blob, offset, NULL);
208                 if (err && !ret) {
209                         ret = err;
210                         debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
211                               ret);
212                 }
213         }
214
215         if (ret)
216                 dm_warn("Some drivers failed to bind\n");
217
218         return ret;
219 }
220
221 int dm_scan_fdt_dev(struct udevice *dev)
222 {
223         if (dev->of_offset == -1)
224                 return 0;
225
226         return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
227                                 gd->flags & GD_FLG_RELOC ? false : true);
228 }
229
230 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
231 {
232         return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
233 }
234 #endif
235
236 __weak int dm_scan_other(bool pre_reloc_only)
237 {
238         return 0;
239 }
240
241 int dm_init_and_scan(bool pre_reloc_only)
242 {
243         int ret;
244
245         ret = dm_init();
246         if (ret) {
247                 debug("dm_init() failed: %d\n", ret);
248                 return ret;
249         }
250         ret = dm_scan_platdata(pre_reloc_only);
251         if (ret) {
252                 debug("dm_scan_platdata() failed: %d\n", ret);
253                 return ret;
254         }
255
256         if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
257                 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
258                 if (ret) {
259                         debug("dm_scan_fdt() failed: %d\n", ret);
260                         return ret;
261                 }
262         }
263
264         ret = dm_scan_other(pre_reloc_only);
265         if (ret)
266                 return ret;
267
268         return 0;
269 }
270
271 /* This is the root driver - all drivers are children of this */
272 U_BOOT_DRIVER(root_driver) = {
273         .name   = "root_driver",
274         .id     = UCLASS_ROOT,
275         .priv_auto_alloc_size = sizeof(struct root_priv),
276 };
277
278 /* This is the root uclass */
279 UCLASS_DRIVER(root) = {
280         .name   = "root",
281         .id     = UCLASS_ROOT,
282 };