1 /* 2 * Device manager 3 * 4 * Copyright (c) 2013 Google, Inc 5 * 6 * (C) Copyright 2012 7 * Pavel Herrmann <morpheus.ibis@gmail.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <fdtdec.h> 14 #include <fdt_support.h> 15 #include <malloc.h> 16 #include <dm/device.h> 17 #include <dm/device-internal.h> 18 #include <dm/lists.h> 19 #include <dm/pinctrl.h> 20 #include <dm/platdata.h> 21 #include <dm/uclass.h> 22 #include <dm/uclass-internal.h> 23 #include <dm/util.h> 24 #include <linux/err.h> 25 #include <linux/list.h> 26 27 DECLARE_GLOBAL_DATA_PTR; 28 29 int device_bind(struct udevice *parent, const struct driver *drv, 30 const char *name, void *platdata, int of_offset, 31 struct udevice **devp) 32 { 33 struct udevice *dev; 34 struct uclass *uc; 35 int size, ret = 0; 36 37 if (devp) 38 *devp = NULL; 39 if (!name) 40 return -EINVAL; 41 42 ret = uclass_get(drv->id, &uc); 43 if (ret) { 44 debug("Missing uclass for driver %s\n", drv->name); 45 return ret; 46 } 47 48 dev = calloc(1, sizeof(struct udevice)); 49 if (!dev) 50 return -ENOMEM; 51 52 INIT_LIST_HEAD(&dev->sibling_node); 53 INIT_LIST_HEAD(&dev->child_head); 54 INIT_LIST_HEAD(&dev->uclass_node); 55 #ifdef CONFIG_DEVRES 56 INIT_LIST_HEAD(&dev->devres_head); 57 #endif 58 dev->platdata = platdata; 59 dev->name = name; 60 dev->of_offset = of_offset; 61 dev->parent = parent; 62 dev->driver = drv; 63 dev->uclass = uc; 64 65 dev->seq = -1; 66 dev->req_seq = -1; 67 if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) { 68 /* 69 * Some devices, such as a SPI bus, I2C bus and serial ports 70 * are numbered using aliases. 71 * 72 * This is just a 'requested' sequence, and will be 73 * resolved (and ->seq updated) when the device is probed. 74 */ 75 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) { 76 if (uc->uc_drv->name && of_offset != -1) { 77 fdtdec_get_alias_seq(gd->fdt_blob, 78 uc->uc_drv->name, of_offset, 79 &dev->req_seq); 80 } 81 } 82 } 83 84 if (!dev->platdata && drv->platdata_auto_alloc_size) { 85 dev->flags |= DM_FLAG_ALLOC_PDATA; 86 dev->platdata = calloc(1, drv->platdata_auto_alloc_size); 87 if (!dev->platdata) { 88 ret = -ENOMEM; 89 goto fail_alloc1; 90 } 91 } 92 93 size = uc->uc_drv->per_device_platdata_auto_alloc_size; 94 if (size) { 95 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA; 96 dev->uclass_platdata = calloc(1, size); 97 if (!dev->uclass_platdata) { 98 ret = -ENOMEM; 99 goto fail_alloc2; 100 } 101 } 102 103 if (parent) { 104 size = parent->driver->per_child_platdata_auto_alloc_size; 105 if (!size) { 106 size = parent->uclass->uc_drv-> 107 per_child_platdata_auto_alloc_size; 108 } 109 if (size) { 110 dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA; 111 dev->parent_platdata = calloc(1, size); 112 if (!dev->parent_platdata) { 113 ret = -ENOMEM; 114 goto fail_alloc3; 115 } 116 } 117 } 118 119 /* put dev into parent's successor list */ 120 if (parent) 121 list_add_tail(&dev->sibling_node, &parent->child_head); 122 123 ret = uclass_bind_device(dev); 124 if (ret) 125 goto fail_uclass_bind; 126 127 /* if we fail to bind we remove device from successors and free it */ 128 if (drv->bind) { 129 ret = drv->bind(dev); 130 if (ret) 131 goto fail_bind; 132 } 133 if (parent && parent->driver->child_post_bind) { 134 ret = parent->driver->child_post_bind(dev); 135 if (ret) 136 goto fail_child_post_bind; 137 } 138 if (uc->uc_drv->post_bind) { 139 ret = uc->uc_drv->post_bind(dev); 140 if (ret) 141 goto fail_uclass_post_bind; 142 } 143 144 if (parent) 145 dm_dbg("Bound device %s to %s\n", dev->name, parent->name); 146 if (devp) 147 *devp = dev; 148 149 dev->flags |= DM_FLAG_BOUND; 150 151 return 0; 152 153 fail_uclass_post_bind: 154 /* There is no child unbind() method, so no clean-up required */ 155 fail_child_post_bind: 156 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) { 157 if (drv->unbind && drv->unbind(dev)) { 158 dm_warn("unbind() method failed on dev '%s' on error path\n", 159 dev->name); 160 } 161 } 162 163 fail_bind: 164 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) { 165 if (uclass_unbind_device(dev)) { 166 dm_warn("Failed to unbind dev '%s' on error path\n", 167 dev->name); 168 } 169 } 170 fail_uclass_bind: 171 if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) { 172 list_del(&dev->sibling_node); 173 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) { 174 free(dev->parent_platdata); 175 dev->parent_platdata = NULL; 176 } 177 } 178 fail_alloc3: 179 if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) { 180 free(dev->uclass_platdata); 181 dev->uclass_platdata = NULL; 182 } 183 fail_alloc2: 184 if (dev->flags & DM_FLAG_ALLOC_PDATA) { 185 free(dev->platdata); 186 dev->platdata = NULL; 187 } 188 fail_alloc1: 189 devres_release_all(dev); 190 191 free(dev); 192 193 return ret; 194 } 195 196 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only, 197 const struct driver_info *info, struct udevice **devp) 198 { 199 struct driver *drv; 200 201 drv = lists_driver_lookup_name(info->name); 202 if (!drv) 203 return -ENOENT; 204 if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC)) 205 return -EPERM; 206 207 return device_bind(parent, drv, info->name, (void *)info->platdata, 208 -1, devp); 209 } 210 211 static void *alloc_priv(int size, uint flags) 212 { 213 void *priv; 214 215 if (flags & DM_FLAG_ALLOC_PRIV_DMA) { 216 priv = memalign(ARCH_DMA_MINALIGN, size); 217 if (priv) 218 memset(priv, '\0', size); 219 } else { 220 priv = calloc(1, size); 221 } 222 223 return priv; 224 } 225 226 int device_probe(struct udevice *dev) 227 { 228 const struct driver *drv; 229 int size = 0; 230 int ret; 231 int seq; 232 233 if (!dev) 234 return -EINVAL; 235 236 if (dev->flags & DM_FLAG_ACTIVATED) 237 return 0; 238 239 drv = dev->driver; 240 assert(drv); 241 242 /* Allocate private data if requested and not reentered */ 243 if (drv->priv_auto_alloc_size && !dev->priv) { 244 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags); 245 if (!dev->priv) { 246 ret = -ENOMEM; 247 goto fail; 248 } 249 } 250 /* Allocate private data if requested and not reentered */ 251 size = dev->uclass->uc_drv->per_device_auto_alloc_size; 252 if (size && !dev->uclass_priv) { 253 dev->uclass_priv = calloc(1, size); 254 if (!dev->uclass_priv) { 255 ret = -ENOMEM; 256 goto fail; 257 } 258 } 259 260 /* Ensure all parents are probed */ 261 if (dev->parent) { 262 size = dev->parent->driver->per_child_auto_alloc_size; 263 if (!size) { 264 size = dev->parent->uclass->uc_drv-> 265 per_child_auto_alloc_size; 266 } 267 if (size && !dev->parent_priv) { 268 dev->parent_priv = alloc_priv(size, drv->flags); 269 if (!dev->parent_priv) { 270 ret = -ENOMEM; 271 goto fail; 272 } 273 } 274 275 ret = device_probe(dev->parent); 276 if (ret) 277 goto fail; 278 279 /* 280 * The device might have already been probed during 281 * the call to device_probe() on its parent device 282 * (e.g. PCI bridge devices). Test the flags again 283 * so that we don't mess up the device. 284 */ 285 if (dev->flags & DM_FLAG_ACTIVATED) 286 return 0; 287 } 288 289 seq = uclass_resolve_seq(dev); 290 if (seq < 0) { 291 ret = seq; 292 goto fail; 293 } 294 dev->seq = seq; 295 296 dev->flags |= DM_FLAG_ACTIVATED; 297 298 /* 299 * Process pinctrl for everything except the root device, and 300 * continue regardless of the result of pinctrl. Don't process pinctrl 301 * settings for pinctrl devices since the device may not yet be 302 * probed. 303 */ 304 if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL) 305 pinctrl_select_state(dev, "default"); 306 307 ret = uclass_pre_probe_device(dev); 308 if (ret) 309 goto fail; 310 311 if (dev->parent && dev->parent->driver->child_pre_probe) { 312 ret = dev->parent->driver->child_pre_probe(dev); 313 if (ret) 314 goto fail; 315 } 316 317 if (drv->ofdata_to_platdata && dev->of_offset >= 0) { 318 ret = drv->ofdata_to_platdata(dev); 319 if (ret) 320 goto fail; 321 } 322 323 if (drv->probe) { 324 ret = drv->probe(dev); 325 if (ret) { 326 dev->flags &= ~DM_FLAG_ACTIVATED; 327 goto fail; 328 } 329 } 330 331 ret = uclass_post_probe_device(dev); 332 if (ret) 333 goto fail_uclass; 334 335 return 0; 336 fail_uclass: 337 if (device_remove(dev)) { 338 dm_warn("%s: Device '%s' failed to remove on error path\n", 339 __func__, dev->name); 340 } 341 fail: 342 dev->flags &= ~DM_FLAG_ACTIVATED; 343 344 dev->seq = -1; 345 device_free(dev); 346 347 return ret; 348 } 349 350 void *dev_get_platdata(struct udevice *dev) 351 { 352 if (!dev) { 353 dm_warn("%s: null device\n", __func__); 354 return NULL; 355 } 356 357 return dev->platdata; 358 } 359 360 void *dev_get_parent_platdata(struct udevice *dev) 361 { 362 if (!dev) { 363 dm_warn("%s: null device\n", __func__); 364 return NULL; 365 } 366 367 return dev->parent_platdata; 368 } 369 370 void *dev_get_uclass_platdata(struct udevice *dev) 371 { 372 if (!dev) { 373 dm_warn("%s: null device\n", __func__); 374 return NULL; 375 } 376 377 return dev->uclass_platdata; 378 } 379 380 void *dev_get_priv(struct udevice *dev) 381 { 382 if (!dev) { 383 dm_warn("%s: null device\n", __func__); 384 return NULL; 385 } 386 387 return dev->priv; 388 } 389 390 void *dev_get_uclass_priv(struct udevice *dev) 391 { 392 if (!dev) { 393 dm_warn("%s: null device\n", __func__); 394 return NULL; 395 } 396 397 return dev->uclass_priv; 398 } 399 400 void *dev_get_parent_priv(struct udevice *dev) 401 { 402 if (!dev) { 403 dm_warn("%s: null device\n", __func__); 404 return NULL; 405 } 406 407 return dev->parent_priv; 408 } 409 410 static int device_get_device_tail(struct udevice *dev, int ret, 411 struct udevice **devp) 412 { 413 if (ret) 414 return ret; 415 416 ret = device_probe(dev); 417 if (ret) 418 return ret; 419 420 *devp = dev; 421 422 return 0; 423 } 424 425 int device_get_child(struct udevice *parent, int index, struct udevice **devp) 426 { 427 struct udevice *dev; 428 429 list_for_each_entry(dev, &parent->child_head, sibling_node) { 430 if (!index--) 431 return device_get_device_tail(dev, 0, devp); 432 } 433 434 return -ENODEV; 435 } 436 437 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq, 438 bool find_req_seq, struct udevice **devp) 439 { 440 struct udevice *dev; 441 442 *devp = NULL; 443 if (seq_or_req_seq == -1) 444 return -ENODEV; 445 446 list_for_each_entry(dev, &parent->child_head, sibling_node) { 447 if ((find_req_seq ? dev->req_seq : dev->seq) == 448 seq_or_req_seq) { 449 *devp = dev; 450 return 0; 451 } 452 } 453 454 return -ENODEV; 455 } 456 457 int device_get_child_by_seq(struct udevice *parent, int seq, 458 struct udevice **devp) 459 { 460 struct udevice *dev; 461 int ret; 462 463 *devp = NULL; 464 ret = device_find_child_by_seq(parent, seq, false, &dev); 465 if (ret == -ENODEV) { 466 /* 467 * We didn't find it in probed devices. See if there is one 468 * that will request this seq if probed. 469 */ 470 ret = device_find_child_by_seq(parent, seq, true, &dev); 471 } 472 return device_get_device_tail(dev, ret, devp); 473 } 474 475 int device_find_child_by_of_offset(struct udevice *parent, int of_offset, 476 struct udevice **devp) 477 { 478 struct udevice *dev; 479 480 *devp = NULL; 481 482 list_for_each_entry(dev, &parent->child_head, sibling_node) { 483 if (dev->of_offset == of_offset) { 484 *devp = dev; 485 return 0; 486 } 487 } 488 489 return -ENODEV; 490 } 491 492 int device_get_child_by_of_offset(struct udevice *parent, int node, 493 struct udevice **devp) 494 { 495 struct udevice *dev; 496 int ret; 497 498 *devp = NULL; 499 ret = device_find_child_by_of_offset(parent, node, &dev); 500 return device_get_device_tail(dev, ret, devp); 501 } 502 503 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent, 504 int of_offset) 505 { 506 struct udevice *dev, *found; 507 508 if (parent->of_offset == of_offset) 509 return parent; 510 511 list_for_each_entry(dev, &parent->child_head, sibling_node) { 512 found = _device_find_global_by_of_offset(dev, of_offset); 513 if (found) 514 return found; 515 } 516 517 return NULL; 518 } 519 520 int device_get_global_by_of_offset(int of_offset, struct udevice **devp) 521 { 522 struct udevice *dev; 523 524 dev = _device_find_global_by_of_offset(gd->dm_root, of_offset); 525 return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp); 526 } 527 528 int device_find_first_child(struct udevice *parent, struct udevice **devp) 529 { 530 if (list_empty(&parent->child_head)) { 531 *devp = NULL; 532 } else { 533 *devp = list_first_entry(&parent->child_head, struct udevice, 534 sibling_node); 535 } 536 537 return 0; 538 } 539 540 int device_find_next_child(struct udevice **devp) 541 { 542 struct udevice *dev = *devp; 543 struct udevice *parent = dev->parent; 544 545 if (list_is_last(&dev->sibling_node, &parent->child_head)) { 546 *devp = NULL; 547 } else { 548 *devp = list_entry(dev->sibling_node.next, struct udevice, 549 sibling_node); 550 } 551 552 return 0; 553 } 554 555 struct udevice *dev_get_parent(struct udevice *child) 556 { 557 return child->parent; 558 } 559 560 ulong dev_get_driver_data(struct udevice *dev) 561 { 562 return dev->driver_data; 563 } 564 565 const void *dev_get_driver_ops(struct udevice *dev) 566 { 567 if (!dev || !dev->driver->ops) 568 return NULL; 569 570 return dev->driver->ops; 571 } 572 573 enum uclass_id device_get_uclass_id(struct udevice *dev) 574 { 575 return dev->uclass->uc_drv->id; 576 } 577 578 const char *dev_get_uclass_name(struct udevice *dev) 579 { 580 if (!dev) 581 return NULL; 582 583 return dev->uclass->uc_drv->name; 584 } 585 586 fdt_addr_t dev_get_addr_index(struct udevice *dev, int index) 587 { 588 #if CONFIG_IS_ENABLED(OF_CONTROL) 589 fdt_addr_t addr; 590 591 if (CONFIG_IS_ENABLED(OF_TRANSLATE)) { 592 const fdt32_t *reg; 593 int len = 0; 594 int na, ns; 595 596 na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset); 597 if (na < 1) { 598 debug("bad #address-cells\n"); 599 return FDT_ADDR_T_NONE; 600 } 601 602 ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset); 603 if (ns < 0) { 604 debug("bad #size-cells\n"); 605 return FDT_ADDR_T_NONE; 606 } 607 608 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len); 609 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) { 610 debug("Req index out of range\n"); 611 return FDT_ADDR_T_NONE; 612 } 613 614 reg += index * (na + ns); 615 616 /* 617 * Use the full-fledged translate function for complex 618 * bus setups. 619 */ 620 addr = fdt_translate_address((void *)gd->fdt_blob, 621 dev->of_offset, reg); 622 } else { 623 /* 624 * Use the "simple" translate function for less complex 625 * bus setups. 626 */ 627 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob, 628 dev->parent->of_offset, 629 dev->of_offset, "reg", 630 index, NULL); 631 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) { 632 if (device_get_uclass_id(dev->parent) == 633 UCLASS_SIMPLE_BUS) 634 addr = simple_bus_translate(dev->parent, addr); 635 } 636 } 637 638 /* 639 * Some platforms need a special address translation. Those 640 * platforms (e.g. mvebu in SPL) can configure a translation 641 * offset in the DM by calling dm_set_translation_offset() that 642 * will get added to all addresses returned by dev_get_addr(). 643 */ 644 addr += dm_get_translation_offset(); 645 646 return addr; 647 #else 648 return FDT_ADDR_T_NONE; 649 #endif 650 } 651 652 fdt_addr_t dev_get_addr(struct udevice *dev) 653 { 654 return dev_get_addr_index(dev, 0); 655 } 656 657 bool device_has_children(struct udevice *dev) 658 { 659 return !list_empty(&dev->child_head); 660 } 661 662 bool device_has_active_children(struct udevice *dev) 663 { 664 struct udevice *child; 665 666 for (device_find_first_child(dev, &child); 667 child; 668 device_find_next_child(&child)) { 669 if (device_active(child)) 670 return true; 671 } 672 673 return false; 674 } 675 676 bool device_is_last_sibling(struct udevice *dev) 677 { 678 struct udevice *parent = dev->parent; 679 680 if (!parent) 681 return false; 682 return list_is_last(&dev->sibling_node, &parent->child_head); 683 } 684 685 int device_set_name(struct udevice *dev, const char *name) 686 { 687 name = strdup(name); 688 if (!name) 689 return -ENOMEM; 690 dev->name = name; 691 692 return 0; 693 } 694