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()); 190 191 return 0; 192 } 193 194 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 195 int dm_remove_devices_flags(uint flags) 196 { 197 device_remove(dm_root(), flags); 198 199 return 0; 200 } 201 #endif 202 203 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) 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 */ 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 } 299 300 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 } 314 315 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 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 332 333 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 } 362 363 __weak int dm_scan_other(bool pre_reloc_only) 364 { 365 return 0; 366 } 367 368 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