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