1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2013 Google, Inc
4 *
5 * (C) Copyright 2012
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 */
8
9 #include <common.h>
10 #include <errno.h>
11 #include <fdtdec.h>
12 #include <malloc.h>
13 #include <linux/libfdt.h>
14 #include <dm/device.h>
15 #include <dm/device-internal.h>
16 #include <dm/lists.h>
17 #include <dm/of.h>
18 #include <dm/of_access.h>
19 #include <dm/platdata.h>
20 #include <dm/read.h>
21 #include <dm/root.h>
22 #include <dm/uclass.h>
23 #include <dm/util.h>
24 #include <linux/list.h>
25
26 DECLARE_GLOBAL_DATA_PTR;
27
28 struct root_priv {
29 fdt_addr_t translation_offset; /* optional translation offset */
30 };
31
32 static const struct driver_info root_info = {
33 .name = "root_driver",
34 };
35
dm_root(void)36 struct udevice *dm_root(void)
37 {
38 if (!gd->dm_root) {
39 dm_warn("Virtual root driver does not exist!\n");
40 return NULL;
41 }
42
43 return gd->dm_root;
44 }
45
dm_fixup_for_gd_move(struct global_data * new_gd)46 void dm_fixup_for_gd_move(struct global_data *new_gd)
47 {
48 /* The sentinel node has moved, so update things that point to it */
49 if (gd->dm_root) {
50 new_gd->uclass_root.next->prev = &new_gd->uclass_root;
51 new_gd->uclass_root.prev->next = &new_gd->uclass_root;
52 }
53 }
54
dm_get_translation_offset(void)55 fdt_addr_t dm_get_translation_offset(void)
56 {
57 struct udevice *root = dm_root();
58 struct root_priv *priv = dev_get_priv(root);
59
60 return priv->translation_offset;
61 }
62
dm_set_translation_offset(fdt_addr_t offs)63 void dm_set_translation_offset(fdt_addr_t offs)
64 {
65 struct udevice *root = dm_root();
66 struct root_priv *priv = dev_get_priv(root);
67
68 priv->translation_offset = offs;
69 }
70
71 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
fix_drivers(void)72 void fix_drivers(void)
73 {
74 struct driver *drv =
75 ll_entry_start(struct driver, driver);
76 const int n_ents = ll_entry_count(struct driver, driver);
77 struct driver *entry;
78
79 for (entry = drv; entry != drv + n_ents; entry++) {
80 if (entry->of_match)
81 entry->of_match = (const struct udevice_id *)
82 ((u32)entry->of_match + gd->reloc_off);
83 if (entry->bind)
84 entry->bind += gd->reloc_off;
85 if (entry->probe)
86 entry->probe += gd->reloc_off;
87 if (entry->remove)
88 entry->remove += gd->reloc_off;
89 if (entry->unbind)
90 entry->unbind += gd->reloc_off;
91 if (entry->ofdata_to_platdata)
92 entry->ofdata_to_platdata += gd->reloc_off;
93 if (entry->child_post_bind)
94 entry->child_post_bind += gd->reloc_off;
95 if (entry->child_pre_probe)
96 entry->child_pre_probe += gd->reloc_off;
97 if (entry->child_post_remove)
98 entry->child_post_remove += gd->reloc_off;
99 /* OPS are fixed in every uclass post_probe function */
100 if (entry->ops)
101 entry->ops += gd->reloc_off;
102 }
103 }
104
fix_uclass(void)105 void fix_uclass(void)
106 {
107 struct uclass_driver *uclass =
108 ll_entry_start(struct uclass_driver, uclass);
109 const int n_ents = ll_entry_count(struct uclass_driver, uclass);
110 struct uclass_driver *entry;
111
112 for (entry = uclass; entry != uclass + n_ents; entry++) {
113 if (entry->post_bind)
114 entry->post_bind += gd->reloc_off;
115 if (entry->pre_unbind)
116 entry->pre_unbind += gd->reloc_off;
117 if (entry->pre_probe)
118 entry->pre_probe += gd->reloc_off;
119 if (entry->post_probe)
120 entry->post_probe += gd->reloc_off;
121 if (entry->pre_remove)
122 entry->pre_remove += gd->reloc_off;
123 if (entry->child_post_bind)
124 entry->child_post_bind += gd->reloc_off;
125 if (entry->child_pre_probe)
126 entry->child_pre_probe += gd->reloc_off;
127 if (entry->init)
128 entry->init += gd->reloc_off;
129 if (entry->destroy)
130 entry->destroy += gd->reloc_off;
131 /* FIXME maybe also need to fix these ops */
132 if (entry->ops)
133 entry->ops += gd->reloc_off;
134 }
135 }
136
fix_devices(void)137 void fix_devices(void)
138 {
139 struct driver_info *dev =
140 ll_entry_start(struct driver_info, driver_info);
141 const int n_ents = ll_entry_count(struct driver_info, driver_info);
142 struct driver_info *entry;
143
144 for (entry = dev; entry != dev + n_ents; entry++) {
145 if (entry->platdata)
146 entry->platdata += gd->reloc_off;
147 }
148 }
149
150 #endif
151
dm_init(bool of_live)152 int dm_init(bool of_live)
153 {
154 int ret;
155
156 if (gd->dm_root) {
157 dm_warn("Virtual root driver already exists!\n");
158 return -EINVAL;
159 }
160 INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
161
162 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
163 fix_drivers();
164 fix_uclass();
165 fix_devices();
166 #endif
167
168 ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
169 if (ret)
170 return ret;
171 #if CONFIG_IS_ENABLED(OF_CONTROL)
172 # if CONFIG_IS_ENABLED(OF_LIVE)
173 if (of_live)
174 DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
175 else
176 #endif
177 DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
178 #endif
179 ret = device_probe(DM_ROOT_NON_CONST);
180 if (ret)
181 return ret;
182
183 return 0;
184 }
185
dm_uninit(void)186 int dm_uninit(void)
187 {
188 device_remove(dm_root(), DM_REMOVE_NORMAL);
189 device_unbind(dm_root());
190
191 return 0;
192 }
193
194 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
dm_remove_devices_flags(uint flags)195 int dm_remove_devices_flags(uint flags)
196 {
197 device_remove(dm_root(), flags);
198
199 return 0;
200 }
201 #endif
202
dm_scan_platdata(bool pre_reloc_only)203 int dm_scan_platdata(bool pre_reloc_only)
204 {
205 int ret;
206
207 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
208 if (ret == -ENOENT) {
209 dm_warn("Some drivers were not found\n");
210 ret = 0;
211 }
212
213 return ret;
214 }
215
216 #if CONFIG_IS_ENABLED(OF_LIVE)
dm_scan_fdt_live(struct udevice * parent,const struct device_node * node_parent,bool pre_reloc_only)217 static int dm_scan_fdt_live(struct udevice *parent,
218 const struct device_node *node_parent,
219 bool pre_reloc_only)
220 {
221 struct device_node *np;
222 int ret = 0, err;
223
224 for (np = node_parent->child; np; np = np->sibling) {
225 if (pre_reloc_only &&
226 !of_find_property(np, "u-boot,dm-pre-reloc", NULL))
227 continue;
228 if (!of_device_is_available(np)) {
229 pr_debug(" - ignoring disabled device\n");
230 continue;
231 }
232 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL);
233 if (err && !ret) {
234 ret = err;
235 debug("%s: ret=%d\n", np->name, ret);
236 }
237 }
238
239 if (ret)
240 dm_warn("Some drivers failed to bind\n");
241
242 return ret;
243 }
244 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */
245
246 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
247 /**
248 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
249 *
250 * This scans the subnodes of a device tree node and and creates a driver
251 * for each one.
252 *
253 * @parent: Parent device for the devices that will be created
254 * @blob: Pointer to device tree blob
255 * @offset: Offset of node to scan
256 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
257 * flag. If false bind all drivers.
258 * @return 0 if OK, -ve on error
259 */
dm_scan_fdt_node(struct udevice * parent,const void * blob,int offset,bool pre_reloc_only)260 static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
261 int offset, bool pre_reloc_only)
262 {
263 int ret = 0, err;
264
265 for (offset = fdt_first_subnode(blob, offset);
266 offset > 0;
267 offset = fdt_next_subnode(blob, offset)) {
268 /* "chosen" node isn't a device itself but may contain some: */
269 if (!strcmp(fdt_get_name(blob, offset, NULL), "chosen")) {
270 pr_debug("parsing subnodes of \"chosen\"\n");
271
272 err = dm_scan_fdt_node(parent, blob, offset,
273 pre_reloc_only);
274 if (err && !ret)
275 ret = err;
276 continue;
277 }
278
279 if (pre_reloc_only &&
280 !dm_fdt_pre_reloc(blob, offset))
281 continue;
282 if (!fdtdec_get_is_enabled(blob, offset)) {
283 pr_debug(" - ignoring disabled device\n");
284 continue;
285 }
286 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
287 if (err && !ret) {
288 ret = err;
289 debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
290 ret);
291 }
292 }
293
294 if (ret)
295 dm_warn("Some drivers failed to bind\n");
296
297 return ret;
298 }
299
dm_scan_fdt_dev(struct udevice * dev)300 int dm_scan_fdt_dev(struct udevice *dev)
301 {
302 if (!dev_of_valid(dev))
303 return 0;
304
305 #if CONFIG_IS_ENABLED(OF_LIVE)
306 if (of_live_active())
307 return dm_scan_fdt_live(dev, dev_np(dev),
308 gd->flags & GD_FLG_RELOC ? false : true);
309 else
310 #endif
311 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
312 gd->flags & GD_FLG_RELOC ? false : true);
313 }
314
dm_scan_fdt(const void * blob,bool pre_reloc_only)315 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
316 {
317 #if CONFIG_IS_ENABLED(OF_LIVE)
318 if (of_live_active())
319 return dm_scan_fdt_live(gd->dm_root, gd->of_root,
320 pre_reloc_only);
321 else
322 #endif
323 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
324 }
325 #else
dm_scan_fdt_node(struct udevice * parent,const void * blob,int offset,bool pre_reloc_only)326 static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
327 int offset, bool pre_reloc_only)
328 {
329 return 0;
330 }
331 #endif
332
dm_extended_scan_fdt(const void * blob,bool pre_reloc_only)333 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
334 {
335 int ret;
336 ofnode node;
337
338 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
339 if (ret) {
340 debug("dm_scan_fdt() failed: %d\n", ret);
341 return ret;
342 }
343
344 /* bind fixed-clock */
345 node = ofnode_path("/clocks");
346 /* if no DT "clocks" node, no need to go further */
347 if (!ofnode_valid(node))
348 return ret;
349
350 #if CONFIG_IS_ENABLED(OF_LIVE)
351 if (of_live_active())
352 ret = dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
353 else
354 #endif
355 ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
356 pre_reloc_only);
357 if (ret)
358 debug("dm_scan_fdt_node() failed: %d\n", ret);
359
360 return ret;
361 }
362
dm_scan_other(bool pre_reloc_only)363 __weak int dm_scan_other(bool pre_reloc_only)
364 {
365 return 0;
366 }
367
dm_init_and_scan(bool pre_reloc_only)368 int dm_init_and_scan(bool pre_reloc_only)
369 {
370 int ret;
371
372 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
373 if (ret) {
374 debug("dm_init() failed: %d\n", ret);
375 return ret;
376 }
377 ret = dm_scan_platdata(pre_reloc_only);
378 if (ret) {
379 debug("dm_scan_platdata() failed: %d\n", ret);
380 return ret;
381 }
382
383 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
384 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
385 if (ret) {
386 debug("dm_extended_scan_dt() failed: %d\n", ret);
387 return ret;
388 }
389 }
390
391 ret = dm_scan_other(pre_reloc_only);
392 if (ret)
393 return ret;
394
395 return 0;
396 }
397
398 /* This is the root driver - all drivers are children of this */
399 U_BOOT_DRIVER(root_driver) = {
400 .name = "root_driver",
401 .id = UCLASS_ROOT,
402 .priv_auto_alloc_size = sizeof(struct root_priv),
403 };
404
405 /* This is the root uclass */
406 UCLASS_DRIVER(root) = {
407 .name = "root",
408 .id = UCLASS_ROOT,
409 };
410