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 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 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 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 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) 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 } 104 105 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 } 136 137 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 151 152 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 } 185 186 int dm_uninit(void) 187 { 188 device_remove(dm_root(), DM_REMOVE_NORMAL); 189 device_unbind(dm_root()); 190 gd->dm_root = NULL; 191 192 return 0; 193 } 194 195 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 196 int dm_remove_devices_flags(uint flags) 197 { 198 device_remove(dm_root(), flags); 199 200 return 0; 201 } 202 #endif 203 204 int dm_scan_platdata(bool pre_reloc_only) 205 { 206 int ret; 207 208 ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only); 209 if (ret == -ENOENT) { 210 dm_warn("Some drivers were not found\n"); 211 ret = 0; 212 } 213 214 return ret; 215 } 216 217 #if CONFIG_IS_ENABLED(OF_LIVE) 218 static int dm_scan_fdt_live(struct udevice *parent, 219 const struct device_node *node_parent, 220 bool pre_reloc_only) 221 { 222 struct device_node *np; 223 int ret = 0, err; 224 225 for (np = node_parent->child; np; np = np->sibling) { 226 /* "chosen" node isn't a device itself but may contain some: */ 227 if (!strcmp(np->name, "chosen")) { 228 pr_debug("parsing subnodes of \"chosen\"\n"); 229 230 err = dm_scan_fdt_live(parent, np, pre_reloc_only); 231 if (err && !ret) 232 ret = err; 233 continue; 234 } 235 236 if (!of_device_is_available(np)) { 237 pr_debug(" - ignoring disabled device\n"); 238 continue; 239 } 240 err = lists_bind_fdt(parent, np_to_ofnode(np), NULL, 241 pre_reloc_only); 242 if (err && !ret) { 243 ret = err; 244 debug("%s: ret=%d\n", np->name, ret); 245 } 246 } 247 248 if (ret) 249 dm_warn("Some drivers failed to bind\n"); 250 251 return ret; 252 } 253 #endif /* CONFIG_IS_ENABLED(OF_LIVE) */ 254 255 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) 256 /** 257 * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node 258 * 259 * This scans the subnodes of a device tree node and and creates a driver 260 * for each one. 261 * 262 * @parent: Parent device for the devices that will be created 263 * @blob: Pointer to device tree blob 264 * @offset: Offset of node to scan 265 * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC 266 * flag. If false bind all drivers. 267 * @return 0 if OK, -ve on error 268 */ 269 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 270 int offset, bool pre_reloc_only) 271 { 272 int ret = 0, err; 273 274 for (offset = fdt_first_subnode(blob, offset); 275 offset > 0; 276 offset = fdt_next_subnode(blob, offset)) { 277 const char *node_name = fdt_get_name(blob, offset, NULL); 278 279 /* 280 * The "chosen" and "firmware" nodes aren't devices 281 * themselves but may contain some: 282 */ 283 if (!strcmp(node_name, "chosen") || 284 !strcmp(node_name, "firmware")) { 285 pr_debug("parsing subnodes of \"%s\"\n", node_name); 286 287 err = dm_scan_fdt_node(parent, blob, offset, 288 pre_reloc_only); 289 if (err && !ret) 290 ret = err; 291 continue; 292 } 293 294 if (!fdtdec_get_is_enabled(blob, offset)) { 295 pr_debug(" - ignoring disabled device\n"); 296 continue; 297 } 298 err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL, 299 pre_reloc_only); 300 if (err && !ret) { 301 ret = err; 302 debug("%s: ret=%d\n", node_name, ret); 303 } 304 } 305 306 if (ret) 307 dm_warn("Some drivers failed to bind\n"); 308 309 return ret; 310 } 311 312 int dm_scan_fdt_dev(struct udevice *dev) 313 { 314 if (!dev_of_valid(dev)) 315 return 0; 316 317 #if CONFIG_IS_ENABLED(OF_LIVE) 318 if (of_live_active()) 319 return dm_scan_fdt_live(dev, dev_np(dev), 320 gd->flags & GD_FLG_RELOC ? false : true); 321 else 322 #endif 323 return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev), 324 gd->flags & GD_FLG_RELOC ? false : true); 325 } 326 327 int dm_scan_fdt(const void *blob, bool pre_reloc_only) 328 { 329 #if CONFIG_IS_ENABLED(OF_LIVE) 330 if (of_live_active()) 331 return dm_scan_fdt_live(gd->dm_root, gd->of_root, 332 pre_reloc_only); 333 else 334 #endif 335 return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only); 336 } 337 #else 338 static int dm_scan_fdt_node(struct udevice *parent, const void *blob, 339 int offset, bool pre_reloc_only) 340 { 341 return 0; 342 } 343 #endif 344 345 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only) 346 { 347 ofnode node; 348 349 node = ofnode_path(path); 350 if (!ofnode_valid(node)) 351 return 0; 352 353 #if CONFIG_IS_ENABLED(OF_LIVE) 354 if (of_live_active()) 355 return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only); 356 #endif 357 return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset, 358 pre_reloc_only); 359 } 360 361 int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only) 362 { 363 int ret; 364 365 ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only); 366 if (ret) { 367 debug("dm_scan_fdt() failed: %d\n", ret); 368 return ret; 369 } 370 371 ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only); 372 if (ret) { 373 debug("scan for /clocks failed: %d\n", ret); 374 return ret; 375 } 376 377 ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only); 378 if (ret) 379 debug("scan for /firmware failed: %d\n", ret); 380 381 return ret; 382 } 383 384 __weak int dm_scan_other(bool pre_reloc_only) 385 { 386 return 0; 387 } 388 389 int dm_init_and_scan(bool pre_reloc_only) 390 { 391 int ret; 392 393 ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE)); 394 if (ret) { 395 debug("dm_init() failed: %d\n", ret); 396 return ret; 397 } 398 ret = dm_scan_platdata(pre_reloc_only); 399 if (ret) { 400 debug("dm_scan_platdata() failed: %d\n", ret); 401 return ret; 402 } 403 404 if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) { 405 ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only); 406 if (ret) { 407 debug("dm_extended_scan_dt() failed: %d\n", ret); 408 return ret; 409 } 410 } 411 412 ret = dm_scan_other(pre_reloc_only); 413 if (ret) 414 return ret; 415 416 return 0; 417 } 418 419 /* This is the root driver - all drivers are children of this */ 420 U_BOOT_DRIVER(root_driver) = { 421 .name = "root_driver", 422 .id = UCLASS_ROOT, 423 .priv_auto_alloc_size = sizeof(struct root_priv), 424 }; 425 426 /* This is the root uclass */ 427 UCLASS_DRIVER(root) = { 428 .name = "root", 429 .id = UCLASS_ROOT, 430 }; 431