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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 static const struct driver_info root_info = {
27         .name           = "root_driver",
28 };
29
30 struct udevice *dm_root(void)
31 {
32         if (!gd->dm_root) {
33                 dm_warn("Virtual root driver does not exist!\n");
34                 return NULL;
35         }
36
37         return gd->dm_root;
38 }
39
40 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
41 void fix_drivers(void)
42 {
43         struct driver *drv =
44                 ll_entry_start(struct driver, driver);
45         const int n_ents = ll_entry_count(struct driver, driver);
46         struct driver *entry;
47
48         for (entry = drv; entry != drv + n_ents; entry++) {
49                 if (entry->of_match)
50                         entry->of_match = (const struct udevice_id *)
51                                 ((u32)entry->of_match + gd->reloc_off);
52                 if (entry->bind)
53                         entry->bind += gd->reloc_off;
54                 if (entry->probe)
55                         entry->probe += gd->reloc_off;
56                 if (entry->remove)
57                         entry->remove += gd->reloc_off;
58                 if (entry->unbind)
59                         entry->unbind += gd->reloc_off;
60                 if (entry->ofdata_to_platdata)
61                         entry->ofdata_to_platdata += gd->reloc_off;
62                 if (entry->child_pre_probe)
63                         entry->child_pre_probe += gd->reloc_off;
64                 if (entry->child_post_remove)
65                         entry->child_post_remove += gd->reloc_off;
66                 /* OPS are fixed in every uclass post_probe function */
67                 if (entry->ops)
68                         entry->ops += gd->reloc_off;
69         }
70 }
71
72 void fix_uclass(void)
73 {
74         struct uclass_driver *uclass =
75                 ll_entry_start(struct uclass_driver, uclass);
76         const int n_ents = ll_entry_count(struct uclass_driver, uclass);
77         struct uclass_driver *entry;
78
79         for (entry = uclass; entry != uclass + n_ents; entry++) {
80                 if (entry->post_bind)
81                         entry->post_bind += gd->reloc_off;
82                 if (entry->pre_unbind)
83                         entry->pre_unbind += gd->reloc_off;
84                 if (entry->post_probe)
85                         entry->post_probe += gd->reloc_off;
86                 if (entry->pre_remove)
87                         entry->pre_remove += gd->reloc_off;
88                 if (entry->init)
89                         entry->init += gd->reloc_off;
90                 if (entry->destroy)
91                         entry->destroy += gd->reloc_off;
92                 /* FIXME maybe also need to fix these ops */
93                 if (entry->ops)
94                         entry->ops += gd->reloc_off;
95         }
96 }
97 #endif
98
99 int dm_init(void)
100 {
101         int ret;
102
103         if (gd->dm_root) {
104                 dm_warn("Virtual root driver already exists!\n");
105                 return -EINVAL;
106         }
107         INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
108
109 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
110         fix_drivers();
111         fix_uclass();
112 #endif
113
114         ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
115         if (ret)
116                 return ret;
117 #if CONFIG_IS_ENABLED(OF_CONTROL)
118         DM_ROOT_NON_CONST->of_offset = 0;
119 #endif
120         ret = device_probe(DM_ROOT_NON_CONST);
121         if (ret)
122                 return ret;
123
124         return 0;
125 }
126
127 int dm_uninit(void)
128 {
129         device_remove(dm_root());
130         device_unbind(dm_root());
131
132         return 0;
133 }
134
135 int dm_scan_platdata(bool pre_reloc_only)
136 {
137         int ret;
138
139         ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
140         if (ret == -ENOENT) {
141                 dm_warn("Some drivers were not found\n");
142                 ret = 0;
143         }
144
145         return ret;
146 }
147
148 #if CONFIG_IS_ENABLED(OF_CONTROL)
149 int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
150                      bool pre_reloc_only)
151 {
152         int ret = 0, err;
153
154         for (offset = fdt_first_subnode(blob, offset);
155              offset > 0;
156              offset = fdt_next_subnode(blob, offset)) {
157                 if (pre_reloc_only &&
158                     !fdt_getprop(blob, offset, "u-boot,dm-pre-reloc", NULL))
159                         continue;
160                 if (!fdtdec_get_is_enabled(blob, offset)) {
161                         dm_dbg("   - ignoring disabled device\n");
162                         continue;
163                 }
164                 err = lists_bind_fdt(parent, blob, offset, NULL);
165                 if (err && !ret) {
166                         ret = err;
167                         debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
168                               ret);
169                 }
170         }
171
172         if (ret)
173                 dm_warn("Some drivers failed to bind\n");
174
175         return ret;
176 }
177
178 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
179 {
180         return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
181 }
182 #endif
183
184 __weak int dm_scan_other(bool pre_reloc_only)
185 {
186         return 0;
187 }
188
189 int dm_init_and_scan(bool pre_reloc_only)
190 {
191         int ret;
192
193         ret = dm_init();
194         if (ret) {
195                 debug("dm_init() failed: %d\n", ret);
196                 return ret;
197         }
198         ret = dm_scan_platdata(pre_reloc_only);
199         if (ret) {
200                 debug("dm_scan_platdata() failed: %d\n", ret);
201                 return ret;
202         }
203
204         if (CONFIG_IS_ENABLED(OF_CONTROL)) {
205                 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
206                 if (ret) {
207                         debug("dm_scan_fdt() failed: %d\n", ret);
208                         return ret;
209                 }
210         }
211
212         ret = dm_scan_other(pre_reloc_only);
213         if (ret)
214                 return ret;
215
216         return 0;
217 }
218
219 /* This is the root driver - all drivers are children of this */
220 U_BOOT_DRIVER(root_driver) = {
221         .name   = "root_driver",
222         .id     = UCLASS_ROOT,
223 };
224
225 /* This is the root uclass */
226 UCLASS_DRIVER(root) = {
227         .name   = "root",
228         .id     = UCLASS_ROOT,
229 };