drivers/core/device.c

   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         if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
 336                 pinctrl_select_state(dev, "default");
 337
 338         return 0;
 339 fail_uclass:
 340         if (device_remove(dev)) {
 341                 dm_warn("%s: Device '%s' failed to remove on error path\n",
 342                         __func__, dev->name);
 343         }
 344 fail:
 345         dev->flags &= ~DM_FLAG_ACTIVATED;
 346
 347         dev->seq = -1;
 348         device_free(dev);
 349
 350         return ret;
 351 }
 352
 353 void *dev_get_platdata(struct udevice *dev)
 354 {
 355         if (!dev) {
 356                 dm_warn("%s: null device\n", __func__);
 357                 return NULL;
 358         }
 359
 360         return dev->platdata;
 361 }
 362
 363 void *dev_get_parent_platdata(struct udevice *dev)
 364 {
 365         if (!dev) {
 366                 dm_warn("%s: null device\n", __func__);
 367                 return NULL;
 368         }
 369
 370         return dev->parent_platdata;
 371 }
 372
 373 void *dev_get_uclass_platdata(struct udevice *dev)
 374 {
 375         if (!dev) {
 376                 dm_warn("%s: null device\n", __func__);
 377                 return NULL;
 378         }
 379
 380         return dev->uclass_platdata;
 381 }
 382
 383 void *dev_get_priv(struct udevice *dev)
 384 {
 385         if (!dev) {
 386                 dm_warn("%s: null device\n", __func__);
 387                 return NULL;
 388         }
 389
 390         return dev->priv;
 391 }
 392
 393 void *dev_get_uclass_priv(struct udevice *dev)
 394 {
 395         if (!dev) {
 396                 dm_warn("%s: null device\n", __func__);
 397                 return NULL;
 398         }
 399
 400         return dev->uclass_priv;
 401 }
 402
 403 void *dev_get_parent_priv(struct udevice *dev)
 404 {
 405         if (!dev) {
 406                 dm_warn("%s: null device\n", __func__);
 407                 return NULL;
 408         }
 409
 410         return dev->parent_priv;
 411 }
 412
 413 static int device_get_device_tail(struct udevice *dev, int ret,
 414                                   struct udevice **devp)
 415 {
 416         if (ret)
 417                 return ret;
 418
 419         ret = device_probe(dev);
 420         if (ret)
 421                 return ret;
 422
 423         *devp = dev;
 424
 425         return 0;
 426 }
 427
 428 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
 429 {
 430         struct udevice *dev;
 431
 432         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 433                 if (!index--)
 434                         return device_get_device_tail(dev, 0, devp);
 435         }
 436
 437         return -ENODEV;
 438 }
 439
 440 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
 441                              bool find_req_seq, struct udevice **devp)
 442 {
 443         struct udevice *dev;
 444
 445         *devp = NULL;
 446         if (seq_or_req_seq == -1)
 447                 return -ENODEV;
 448
 449         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 450                 if ((find_req_seq ? dev->req_seq : dev->seq) ==
 451                                 seq_or_req_seq) {
 452                         *devp = dev;
 453                         return 0;
 454                 }
 455         }
 456
 457         return -ENODEV;
 458 }
 459
 460 int device_get_child_by_seq(struct udevice *parent, int seq,
 461                             struct udevice **devp)
 462 {
 463         struct udevice *dev;
 464         int ret;
 465
 466         *devp = NULL;
 467         ret = device_find_child_by_seq(parent, seq, false, &dev);
 468         if (ret == -ENODEV) {
 469                 /*
 470                  * We didn't find it in probed devices. See if there is one
 471                  * that will request this seq if probed.
 472                  */
 473                 ret = device_find_child_by_seq(parent, seq, true, &dev);
 474         }
 475         return device_get_device_tail(dev, ret, devp);
 476 }
 477
 478 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
 479                                    struct udevice **devp)
 480 {
 481         struct udevice *dev;
 482
 483         *devp = NULL;
 484
 485         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 486                 if (dev->of_offset == of_offset) {
 487                         *devp = dev;
 488                         return 0;
 489                 }
 490         }
 491
 492         return -ENODEV;
 493 }
 494
 495 int device_get_child_by_of_offset(struct udevice *parent, int node,
 496                                   struct udevice **devp)
 497 {
 498         struct udevice *dev;
 499         int ret;
 500
 501         *devp = NULL;
 502         ret = device_find_child_by_of_offset(parent, node, &dev);
 503         return device_get_device_tail(dev, ret, devp);
 504 }
 505
 506 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
 507                                                         int of_offset)
 508 {
 509         struct udevice *dev, *found;
 510
 511         if (parent->of_offset == of_offset)
 512                 return parent;
 513
 514         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 515                 found = _device_find_global_by_of_offset(dev, of_offset);
 516                 if (found)
 517                         return found;
 518         }
 519
 520         return NULL;
 521 }
 522
 523 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
 524 {
 525         struct udevice *dev;
 526
 527         dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
 528         return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
 529 }
 530
 531 int device_find_first_child(struct udevice *parent, struct udevice **devp)
 532 {
 533         if (list_empty(&parent->child_head)) {
 534                 *devp = NULL;
 535         } else {
 536                 *devp = list_first_entry(&parent->child_head, struct udevice,
 537                                          sibling_node);
 538         }
 539
 540         return 0;
 541 }
 542
 543 int device_find_next_child(struct udevice **devp)
 544 {
 545         struct udevice *dev = *devp;
 546         struct udevice *parent = dev->parent;
 547
 548         if (list_is_last(&dev->sibling_node, &parent->child_head)) {
 549                 *devp = NULL;
 550         } else {
 551                 *devp = list_entry(dev->sibling_node.next, struct udevice,
 552                                    sibling_node);
 553         }
 554
 555         return 0;
 556 }
 557
 558 struct udevice *dev_get_parent(struct udevice *child)
 559 {
 560         return child->parent;
 561 }
 562
 563 ulong dev_get_driver_data(struct udevice *dev)
 564 {
 565         return dev->driver_data;
 566 }
 567
 568 const void *dev_get_driver_ops(struct udevice *dev)
 569 {
 570         if (!dev || !dev->driver->ops)
 571                 return NULL;
 572
 573         return dev->driver->ops;
 574 }
 575
 576 enum uclass_id device_get_uclass_id(struct udevice *dev)
 577 {
 578         return dev->uclass->uc_drv->id;
 579 }
 580
 581 const char *dev_get_uclass_name(struct udevice *dev)
 582 {
 583         if (!dev)
 584                 return NULL;
 585
 586         return dev->uclass->uc_drv->name;
 587 }
 588
 589 fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
 590 {
 591 #if CONFIG_IS_ENABLED(OF_CONTROL)
 592         fdt_addr_t addr;
 593
 594         if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
 595                 const fdt32_t *reg;
 596                 int len = 0;
 597                 int na, ns;
 598
 599                 na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
 600                 if (na < 1) {
 601                         debug("bad #address-cells\n");
 602                         return FDT_ADDR_T_NONE;
 603                 }
 604
 605                 ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
 606                 if (ns < 0) {
 607                         debug("bad #size-cells\n");
 608                         return FDT_ADDR_T_NONE;
 609                 }
 610
 611                 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
 612                 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
 613                         debug("Req index out of range\n");
 614                         return FDT_ADDR_T_NONE;
 615                 }
 616
 617                 reg += index * (na + ns);
 618
 619                 /*
 620                  * Use the full-fledged translate function for complex
 621                  * bus setups.
 622                  */
 623                 addr = fdt_translate_address((void *)gd->fdt_blob,
 624                                              dev->of_offset, reg);
 625         } else {
 626                 /*
 627                  * Use the "simple" translate function for less complex
 628                  * bus setups.
 629                  */
 630                 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
 631                                                         dev->parent->of_offset,
 632                                                         dev->of_offset, "reg",
 633                                                         index, NULL);
 634                 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
 635                         if (device_get_uclass_id(dev->parent) ==
 636                             UCLASS_SIMPLE_BUS)
 637                                 addr = simple_bus_translate(dev->parent, addr);
 638                 }
 639         }
 640
 641         /*
 642          * Some platforms need a special address translation. Those
 643          * platforms (e.g. mvebu in SPL) can configure a translation
 644          * offset in the DM by calling dm_set_translation_offset() that
 645          * will get added to all addresses returned by dev_get_addr().
 646          */
 647         addr += dm_get_translation_offset();
 648
 649         return addr;
 650 #else
 651         return FDT_ADDR_T_NONE;
 652 #endif
 653 }
 654
 655 fdt_addr_t dev_get_addr_name(struct udevice *dev, const char *name)
 656 {
 657 #if CONFIG_IS_ENABLED(OF_CONTROL)
 658         int index;
 659
 660         index = fdt_find_string(gd->fdt_blob, dev->parent->of_offset,
 661                                 "reg-names", name);
 662         if (index < 0)
 663                 return index;
 664
 665         return dev_get_addr_index(dev, index);
 666 #else
 667         return FDT_ADDR_T_NONE;
 668 #endif
 669 }
 670
 671 fdt_addr_t dev_get_addr(struct udevice *dev)
 672 {
 673         return dev_get_addr_index(dev, 0);
 674 }
 675
 676 bool device_has_children(struct udevice *dev)
 677 {
 678         return !list_empty(&dev->child_head);
 679 }
 680
 681 bool device_has_active_children(struct udevice *dev)
 682 {
 683         struct udevice *child;
 684
 685         for (device_find_first_child(dev, &child);
 686              child;
 687              device_find_next_child(&child)) {
 688                 if (device_active(child))
 689                         return true;
 690         }
 691
 692         return false;
 693 }
 694
 695 bool device_is_last_sibling(struct udevice *dev)
 696 {
 697         struct udevice *parent = dev->parent;
 698
 699         if (!parent)
 700                 return false;
 701         return list_is_last(&dev->sibling_node, &parent->child_head);
 702 }
 703
 704 int device_set_name(struct udevice *dev, const char *name)
 705 {
 706         name = strdup(name);
 707         if (!name)
 708                 return -ENOMEM;
 709         dev->name = name;
 710
 711         return 0;
 712 }