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 <malloc.h> 13 #include <dm/device.h> 14 #include <dm/device-internal.h> 15 #include <dm/lists.h> 16 #include <dm/uclass.h> 17 #include <dm/uclass-internal.h> 18 #include <dm/util.h> 19 20 DECLARE_GLOBAL_DATA_PTR; 21 22 struct uclass *uclass_find(enum uclass_id key) 23 { 24 struct uclass *uc; 25 26 if (!gd->dm_root) 27 return NULL; 28 /* 29 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found 30 * node to the start of the list, or creating a linear array mapping 31 * id to node. 32 */ 33 list_for_each_entry(uc, &gd->uclass_root, sibling_node) { 34 if (uc->uc_drv->id == key) 35 return uc; 36 } 37 38 return NULL; 39 } 40 41 /** 42 * uclass_add() - Create new uclass in list 43 * @id: Id number to create 44 * @ucp: Returns pointer to uclass, or NULL on error 45 * @return 0 on success, -ve on error 46 * 47 * The new uclass is added to the list. There must be only one uclass for 48 * each id. 49 */ 50 static int uclass_add(enum uclass_id id, struct uclass **ucp) 51 { 52 struct uclass_driver *uc_drv; 53 struct uclass *uc; 54 int ret; 55 56 *ucp = NULL; 57 uc_drv = lists_uclass_lookup(id); 58 if (!uc_drv) { 59 dm_warn("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n", 60 id); 61 return -ENOENT; 62 } 63 uc = calloc(1, sizeof(*uc)); 64 if (!uc) 65 return -ENOMEM; 66 if (uc_drv->priv_auto_alloc_size) { 67 uc->priv = calloc(1, uc_drv->priv_auto_alloc_size); 68 if (!uc->priv) { 69 ret = -ENOMEM; 70 goto fail_mem; 71 } 72 } 73 uc->uc_drv = uc_drv; 74 INIT_LIST_HEAD(&uc->sibling_node); 75 INIT_LIST_HEAD(&uc->dev_head); 76 list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST); 77 78 if (uc_drv->init) { 79 ret = uc_drv->init(uc); 80 if (ret) 81 goto fail; 82 } 83 84 *ucp = uc; 85 86 return 0; 87 fail: 88 if (uc_drv->priv_auto_alloc_size) { 89 free(uc->priv); 90 uc->priv = NULL; 91 } 92 list_del(&uc->sibling_node); 93 fail_mem: 94 free(uc); 95 96 return ret; 97 } 98 99 int uclass_destroy(struct uclass *uc) 100 { 101 struct uclass_driver *uc_drv; 102 struct udevice *dev, *tmp; 103 int ret; 104 105 list_for_each_entry_safe(dev, tmp, &uc->dev_head, uclass_node) { 106 ret = device_remove(dev); 107 if (ret) 108 return ret; 109 ret = device_unbind(dev); 110 if (ret) 111 return ret; 112 } 113 114 uc_drv = uc->uc_drv; 115 if (uc_drv->destroy) 116 uc_drv->destroy(uc); 117 list_del(&uc->sibling_node); 118 if (uc_drv->priv_auto_alloc_size) 119 free(uc->priv); 120 free(uc); 121 122 return 0; 123 } 124 125 int uclass_get(enum uclass_id id, struct uclass **ucp) 126 { 127 struct uclass *uc; 128 129 *ucp = NULL; 130 uc = uclass_find(id); 131 if (!uc) 132 return uclass_add(id, ucp); 133 *ucp = uc; 134 135 return 0; 136 } 137 138 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp) 139 { 140 struct uclass *uc; 141 struct udevice *dev; 142 int ret; 143 144 *devp = NULL; 145 ret = uclass_get(id, &uc); 146 if (ret) 147 return ret; 148 149 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 150 if (!index--) { 151 *devp = dev; 152 return 0; 153 } 154 } 155 156 return -ENODEV; 157 } 158 159 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq, 160 bool find_req_seq, struct udevice **devp) 161 { 162 struct uclass *uc; 163 struct udevice *dev; 164 int ret; 165 166 *devp = NULL; 167 debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq); 168 if (seq_or_req_seq == -1) 169 return -ENODEV; 170 ret = uclass_get(id, &uc); 171 if (ret) 172 return ret; 173 174 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 175 debug(" - %d %d\n", dev->req_seq, dev->seq); 176 if ((find_req_seq ? dev->req_seq : dev->seq) == 177 seq_or_req_seq) { 178 *devp = dev; 179 debug(" - found\n"); 180 return 0; 181 } 182 } 183 debug(" - not found\n"); 184 185 return -ENODEV; 186 } 187 188 static int uclass_find_device_by_of_offset(enum uclass_id id, int node, 189 struct udevice **devp) 190 { 191 struct uclass *uc; 192 struct udevice *dev; 193 int ret; 194 195 *devp = NULL; 196 if (node < 0) 197 return -ENODEV; 198 ret = uclass_get(id, &uc); 199 if (ret) 200 return ret; 201 202 list_for_each_entry(dev, &uc->dev_head, uclass_node) { 203 if (dev->of_offset == node) { 204 *devp = dev; 205 return 0; 206 } 207 } 208 209 return -ENODEV; 210 } 211 212 /** 213 * uclass_get_device_tail() - handle the end of a get_device call 214 * 215 * This handles returning an error or probing a device as needed. 216 * 217 * @dev: Device that needs to be probed 218 * @ret: Error to return. If non-zero then the device is not probed 219 * @devp: Returns the value of 'dev' if there is no error 220 * @return ret, if non-zero, else the result of the device_probe() call 221 */ 222 static int uclass_get_device_tail(struct udevice *dev, int ret, 223 struct udevice **devp) 224 { 225 if (ret) 226 return ret; 227 228 ret = device_probe(dev); 229 if (ret) 230 return ret; 231 232 *devp = dev; 233 234 return 0; 235 } 236 237 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp) 238 { 239 struct udevice *dev; 240 int ret; 241 242 *devp = NULL; 243 ret = uclass_find_device(id, index, &dev); 244 return uclass_get_device_tail(dev, ret, devp); 245 } 246 247 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp) 248 { 249 struct udevice *dev; 250 int ret; 251 252 *devp = NULL; 253 ret = uclass_find_device_by_seq(id, seq, false, &dev); 254 if (ret == -ENODEV) { 255 /* 256 * We didn't find it in probed devices. See if there is one 257 * that will request this seq if probed. 258 */ 259 ret = uclass_find_device_by_seq(id, seq, true, &dev); 260 } 261 return uclass_get_device_tail(dev, ret, devp); 262 } 263 264 int uclass_get_device_by_of_offset(enum uclass_id id, int node, 265 struct udevice **devp) 266 { 267 struct udevice *dev; 268 int ret; 269 270 *devp = NULL; 271 ret = uclass_find_device_by_of_offset(id, node, &dev); 272 return uclass_get_device_tail(dev, ret, devp); 273 } 274 275 int uclass_first_device(enum uclass_id id, struct udevice **devp) 276 { 277 struct uclass *uc; 278 struct udevice *dev; 279 int ret; 280 281 *devp = NULL; 282 ret = uclass_get(id, &uc); 283 if (ret) 284 return ret; 285 if (list_empty(&uc->dev_head)) 286 return 0; 287 288 dev = list_first_entry(&uc->dev_head, struct udevice, uclass_node); 289 ret = device_probe(dev); 290 if (ret) 291 return ret; 292 *devp = dev; 293 294 return 0; 295 } 296 297 int uclass_next_device(struct udevice **devp) 298 { 299 struct udevice *dev = *devp; 300 int ret; 301 302 *devp = NULL; 303 if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head)) 304 return 0; 305 306 dev = list_entry(dev->uclass_node.next, struct udevice, 307 uclass_node); 308 ret = device_probe(dev); 309 if (ret) 310 return ret; 311 *devp = dev; 312 313 return 0; 314 } 315 316 int uclass_bind_device(struct udevice *dev) 317 { 318 struct uclass *uc; 319 int ret; 320 321 uc = dev->uclass; 322 323 list_add_tail(&dev->uclass_node, &uc->dev_head); 324 325 if (uc->uc_drv->post_bind) { 326 ret = uc->uc_drv->post_bind(dev); 327 if (ret) { 328 list_del(&dev->uclass_node); 329 return ret; 330 } 331 } 332 333 return 0; 334 } 335 336 int uclass_unbind_device(struct udevice *dev) 337 { 338 struct uclass *uc; 339 int ret; 340 341 uc = dev->uclass; 342 if (uc->uc_drv->pre_unbind) { 343 ret = uc->uc_drv->pre_unbind(dev); 344 if (ret) 345 return ret; 346 } 347 348 list_del(&dev->uclass_node); 349 return 0; 350 } 351 352 int uclass_resolve_seq(struct udevice *dev) 353 { 354 struct udevice *dup; 355 int seq; 356 int ret; 357 358 assert(dev->seq == -1); 359 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq, 360 false, &dup); 361 if (!ret) { 362 dm_warn("Device '%s': seq %d is in use by '%s'\n", 363 dev->name, dev->req_seq, dup->name); 364 } else if (ret == -ENODEV) { 365 /* Our requested sequence number is available */ 366 if (dev->req_seq != -1) 367 return dev->req_seq; 368 } else { 369 return ret; 370 } 371 372 for (seq = 0; seq < DM_MAX_SEQ; seq++) { 373 ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq, 374 false, &dup); 375 if (ret == -ENODEV) 376 break; 377 if (ret) 378 return ret; 379 } 380 return seq; 381 } 382 383 int uclass_post_probe_device(struct udevice *dev) 384 { 385 struct uclass_driver *uc_drv = dev->uclass->uc_drv; 386 387 if (uc_drv->post_probe) 388 return uc_drv->post_probe(dev); 389 390 return 0; 391 } 392 393 int uclass_pre_remove_device(struct udevice *dev) 394 { 395 struct uclass_driver *uc_drv; 396 struct uclass *uc; 397 int ret; 398 399 uc = dev->uclass; 400 uc_drv = uc->uc_drv; 401 if (uc->uc_drv->pre_remove) { 402 ret = uc->uc_drv->pre_remove(dev); 403 if (ret) 404 return ret; 405 } 406 if (uc_drv->per_device_auto_alloc_size) { 407 free(dev->uclass_priv); 408 dev->uclass_priv = NULL; 409 } 410 dev->seq = -1; 411 412 return 0; 413 } 414