disk/part.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <env.h>
  10 #include <errno.h>
  11 #include <ide.h>
  12 #include <malloc.h>
  13 #include <part.h>
  14 #include <ubifs_uboot.h>
  15
  16 #undef  PART_DEBUG
  17
  18 #ifdef  PART_DEBUG
  19 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  20 #else
  21 #define PRINTF(fmt,args...)
  22 #endif
  23
  24 /* Check all partition types */
  25 #define PART_TYPE_ALL           -1
  26
  27 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
  28 {
  29         struct part_driver *drv =
  30                 ll_entry_start(struct part_driver, part_driver);
  31         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  32         struct part_driver *entry;
  33
  34         if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
  35                 for (entry = drv; entry != drv + n_ents; entry++) {
  36                         int ret;
  37
  38                         ret = entry->test(dev_desc);
  39                         if (!ret) {
  40                                 dev_desc->part_type = entry->part_type;
  41                                 return entry;
  42                         }
  43                 }
  44         } else {
  45                 for (entry = drv; entry != drv + n_ents; entry++) {
  46                         if (dev_desc->part_type == entry->part_type)
  47                                 return entry;
  48                 }
  49         }
  50
  51         /* Not found */
  52         return NULL;
  53 }
  54
  55 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  56 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  57 {
  58         struct blk_desc *dev_desc;
  59         int ret;
  60
  61         dev_desc = blk_get_devnum_by_typename(ifname, dev);
  62         if (!dev_desc) {
  63                 debug("%s: No device for iface '%s', dev %d\n", __func__,
  64                       ifname, dev);
  65                 return NULL;
  66         }
  67         ret = blk_dselect_hwpart(dev_desc, hwpart);
  68         if (ret) {
  69                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
  70                       ret);
  71                 return NULL;
  72         }
  73
  74         return dev_desc;
  75 }
  76
  77 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  78 {
  79         return get_dev_hwpart(ifname, dev, 0);
  80 }
  81 #else
  82 struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  83 {
  84         return NULL;
  85 }
  86
  87 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  88 {
  89         return NULL;
  90 }
  91 #endif
  92
  93 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  94
  95 /* ------------------------------------------------------------------------- */
  96 /*
  97  * reports device info to the user
  98  */
  99
 100 #ifdef CONFIG_LBA48
 101 typedef uint64_t lba512_t;
 102 #else
 103 typedef lbaint_t lba512_t;
 104 #endif
 105
 106 /*
 107  * Overflowless variant of (block_count * mul_by / 2**right_shift)
 108  * when 2**right_shift > mul_by
 109  */
 110 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
 111                               int right_shift)
 112 {
 113         lba512_t bc_quot, bc_rem;
 114
 115         /* x * m / d == x / d * m + (x % d) * m / d */
 116         bc_quot = block_count >> right_shift;
 117         bc_rem  = block_count - (bc_quot << right_shift);
 118         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
 119 }
 120
 121 void dev_print (struct blk_desc *dev_desc)
 122 {
 123         lba512_t lba512; /* number of blocks if 512bytes block size */
 124
 125         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 126                 puts ("not available\n");
 127                 return;
 128         }
 129
 130         switch (dev_desc->if_type) {
 131         case IF_TYPE_SCSI:
 132                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
 133                         dev_desc->target,dev_desc->lun,
 134                         dev_desc->vendor,
 135                         dev_desc->product,
 136                         dev_desc->revision);
 137                 break;
 138         case IF_TYPE_ATAPI:
 139         case IF_TYPE_IDE:
 140         case IF_TYPE_SATA:
 141                 printf ("Model: %s Firm: %s Ser#: %s\n",
 142                         dev_desc->vendor,
 143                         dev_desc->revision,
 144                         dev_desc->product);
 145                 break;
 146         case IF_TYPE_SD:
 147         case IF_TYPE_MMC:
 148         case IF_TYPE_USB:
 149         case IF_TYPE_NVME:
 150                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 151                         dev_desc->vendor,
 152                         dev_desc->revision,
 153                         dev_desc->product);
 154                 break;
 155         case IF_TYPE_VIRTIO:
 156                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
 157                 break;
 158         case IF_TYPE_DOC:
 159                 puts("device type DOC\n");
 160                 return;
 161         case IF_TYPE_UNKNOWN:
 162                 puts("device type unknown\n");
 163                 return;
 164         default:
 165                 printf("Unhandled device type: %i\n", dev_desc->if_type);
 166                 return;
 167         }
 168         puts ("            Type: ");
 169         if (dev_desc->removable)
 170                 puts ("Removable ");
 171         switch (dev_desc->type & 0x1F) {
 172         case DEV_TYPE_HARDDISK:
 173                 puts ("Hard Disk");
 174                 break;
 175         case DEV_TYPE_CDROM:
 176                 puts ("CD ROM");
 177                 break;
 178         case DEV_TYPE_OPDISK:
 179                 puts ("Optical Device");
 180                 break;
 181         case DEV_TYPE_TAPE:
 182                 puts ("Tape");
 183                 break;
 184         default:
 185                 printf ("# %02X #", dev_desc->type & 0x1F);
 186                 break;
 187         }
 188         puts ("\n");
 189         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
 190                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 191                 lbaint_t lba;
 192
 193                 lba = dev_desc->lba;
 194
 195                 lba512 = (lba * (dev_desc->blksz/512));
 196                 /* round to 1 digit */
 197                 /* 2048 = (1024 * 1024) / 512 MB */
 198                 mb = lba512_muldiv(lba512, 10, 11);
 199
 200                 mb_quot = mb / 10;
 201                 mb_rem  = mb - (10 * mb_quot);
 202
 203                 gb = mb / 1024;
 204                 gb_quot = gb / 10;
 205                 gb_rem  = gb - (10 * gb_quot);
 206 #ifdef CONFIG_LBA48
 207                 if (dev_desc->lba48)
 208                         printf ("            Supports 48-bit addressing\n");
 209 #endif
 210 #if defined(CONFIG_SYS_64BIT_LBA)
 211                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 212                         mb_quot, mb_rem,
 213                         gb_quot, gb_rem,
 214                         lba,
 215                         dev_desc->blksz);
 216 #else
 217                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 218                         mb_quot, mb_rem,
 219                         gb_quot, gb_rem,
 220                         (ulong)lba,
 221                         dev_desc->blksz);
 222 #endif
 223         } else {
 224                 puts ("            Capacity: not available\n");
 225         }
 226 }
 227 #endif
 228
 229 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 230
 231 void part_init(struct blk_desc *dev_desc)
 232 {
 233         struct part_driver *drv =
 234                 ll_entry_start(struct part_driver, part_driver);
 235         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 236         struct part_driver *entry;
 237
 238         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
 239
 240         dev_desc->part_type = PART_TYPE_UNKNOWN;
 241         for (entry = drv; entry != drv + n_ents; entry++) {
 242                 int ret;
 243
 244                 ret = entry->test(dev_desc);
 245                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 246                 if (!ret) {
 247                         dev_desc->part_type = entry->part_type;
 248                         break;
 249                 }
 250         }
 251 }
 252
 253 static void print_part_header(const char *type, struct blk_desc *dev_desc)
 254 {
 255 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 256         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 257         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 258         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 259         CONFIG_IS_ENABLED(EFI_PARTITION)
 260         puts ("\nPartition Map for ");
 261         switch (dev_desc->if_type) {
 262         case IF_TYPE_IDE:
 263                 puts ("IDE");
 264                 break;
 265         case IF_TYPE_SATA:
 266                 puts ("SATA");
 267                 break;
 268         case IF_TYPE_SCSI:
 269                 puts ("SCSI");
 270                 break;
 271         case IF_TYPE_ATAPI:
 272                 puts ("ATAPI");
 273                 break;
 274         case IF_TYPE_USB:
 275                 puts ("USB");
 276                 break;
 277         case IF_TYPE_DOC:
 278                 puts ("DOC");
 279                 break;
 280         case IF_TYPE_MMC:
 281                 puts ("MMC");
 282                 break;
 283         case IF_TYPE_HOST:
 284                 puts ("HOST");
 285                 break;
 286         case IF_TYPE_NVME:
 287                 puts ("NVMe");
 288                 break;
 289         case IF_TYPE_VIRTIO:
 290                 puts("VirtIO");
 291                 break;
 292         default:
 293                 puts ("UNKNOWN");
 294                 break;
 295         }
 296         printf (" device %d  --   Partition Type: %s\n\n",
 297                         dev_desc->devnum, type);
 298 #endif /* any CONFIG_..._PARTITION */
 299 }
 300
 301 void part_print(struct blk_desc *dev_desc)
 302 {
 303         struct part_driver *drv;
 304
 305         drv = part_driver_lookup_type(dev_desc);
 306         if (!drv) {
 307                 printf("## Unknown partition table type %x\n",
 308                        dev_desc->part_type);
 309                 return;
 310         }
 311
 312         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 313         print_part_header(drv->name, dev_desc);
 314         if (drv->print)
 315                 drv->print(dev_desc);
 316 }
 317
 318 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 319
 320 int part_get_info(struct blk_desc *dev_desc, int part,
 321                        struct disk_partition *info)
 322 {
 323 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 324         struct part_driver *drv;
 325
 326 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 327         /* The common case is no UUID support */
 328         info->uuid[0] = 0;
 329 #endif
 330 #ifdef CONFIG_PARTITION_TYPE_GUID
 331         info->type_guid[0] = 0;
 332 #endif
 333
 334         drv = part_driver_lookup_type(dev_desc);
 335         if (!drv) {
 336                 debug("## Unknown partition table type %x\n",
 337                       dev_desc->part_type);
 338                 return -EPROTONOSUPPORT;
 339         }
 340         if (!drv->get_info) {
 341                 PRINTF("## Driver %s does not have the get_info() method\n",
 342                        drv->name);
 343                 return -ENOSYS;
 344         }
 345         if (drv->get_info(dev_desc, part, info) == 0) {
 346                 PRINTF("## Valid %s partition found ##\n", drv->name);
 347                 return 0;
 348         }
 349 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 350
 351         return -1;
 352 }
 353
 354 int part_get_info_whole_disk(struct blk_desc *dev_desc,
 355                              struct disk_partition *info)
 356 {
 357         info->start = 0;
 358         info->size = dev_desc->lba;
 359         info->blksz = dev_desc->blksz;
 360         info->bootable = 0;
 361         strcpy((char *)info->type, BOOT_PART_TYPE);
 362         strcpy((char *)info->name, "Whole Disk");
 363 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 364         info->uuid[0] = 0;
 365 #endif
 366 #ifdef CONFIG_PARTITION_TYPE_GUID
 367         info->type_guid[0] = 0;
 368 #endif
 369
 370         return 0;
 371 }
 372
 373 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 374                           struct blk_desc **dev_desc)
 375 {
 376         char *ep;
 377         char *dup_str = NULL;
 378         const char *dev_str, *hwpart_str;
 379         int dev, hwpart;
 380
 381         hwpart_str = strchr(dev_hwpart_str, '.');
 382         if (hwpart_str) {
 383                 dup_str = strdup(dev_hwpart_str);
 384                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 385                 dev_str = dup_str;
 386                 hwpart_str++;
 387         } else {
 388                 dev_str = dev_hwpart_str;
 389                 hwpart = 0;
 390         }
 391
 392         dev = simple_strtoul(dev_str, &ep, 16);
 393         if (*ep) {
 394                 printf("** Bad device specification %s %s **\n",
 395                        ifname, dev_str);
 396                 dev = -EINVAL;
 397                 goto cleanup;
 398         }
 399
 400         if (hwpart_str) {
 401                 hwpart = simple_strtoul(hwpart_str, &ep, 16);
 402                 if (*ep) {
 403                         printf("** Bad HW partition specification %s %s **\n",
 404                             ifname, hwpart_str);
 405                         dev = -EINVAL;
 406                         goto cleanup;
 407                 }
 408         }
 409
 410         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
 411         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
 412                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 413                 dev = -ENOENT;
 414                 goto cleanup;
 415         }
 416
 417 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 418         /*
 419          * Updates the partition table for the specified hw partition.
 420          * Always should be done, otherwise hw partition 0 will return stale
 421          * data after displaying a non-zero hw partition.
 422          */
 423         part_init(*dev_desc);
 424 #endif
 425
 426 cleanup:
 427         free(dup_str);
 428         return dev;
 429 }
 430
 431 #define PART_UNSPECIFIED -2
 432 #define PART_AUTO -1
 433 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 434                              struct blk_desc **dev_desc,
 435                              struct disk_partition *info, int allow_whole_dev)
 436 {
 437         int ret = -1;
 438         const char *part_str;
 439         char *dup_str = NULL;
 440         const char *dev_str;
 441         int dev;
 442         char *ep;
 443         int p;
 444         int part;
 445         struct disk_partition tmpinfo;
 446
 447 #ifdef CONFIG_SANDBOX
 448         /*
 449          * Special-case a pseudo block device "hostfs", to allow access to the
 450          * host's own filesystem.
 451          */
 452         if (0 == strcmp(ifname, "hostfs")) {
 453                 *dev_desc = NULL;
 454                 info->start = 0;
 455                 info->size = 0;
 456                 info->blksz = 0;
 457                 info->bootable = 0;
 458                 strcpy((char *)info->type, BOOT_PART_TYPE);
 459                 strcpy((char *)info->name, "Sandbox host");
 460 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 461                 info->uuid[0] = 0;
 462 #endif
 463 #ifdef CONFIG_PARTITION_TYPE_GUID
 464                 info->type_guid[0] = 0;
 465 #endif
 466
 467                 return 0;
 468         }
 469 #endif
 470
 471 #ifdef CONFIG_CMD_UBIFS
 472         /*
 473          * Special-case ubi, ubi goes through a mtd, rather than through
 474          * a regular block device.
 475          */
 476         if (0 == strcmp(ifname, "ubi")) {
 477                 if (!ubifs_is_mounted()) {
 478                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 479                         return -1;
 480                 }
 481
 482                 *dev_desc = NULL;
 483                 memset(info, 0, sizeof(*info));
 484                 strcpy((char *)info->type, BOOT_PART_TYPE);
 485                 strcpy((char *)info->name, "UBI");
 486 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 487                 info->uuid[0] = 0;
 488 #endif
 489                 return 0;
 490         }
 491 #endif
 492
 493         /* If no dev_part_str, use bootdevice environment variable */
 494         if (!dev_part_str || !strlen(dev_part_str) ||
 495             !strcmp(dev_part_str, "-"))
 496                 dev_part_str = env_get("bootdevice");
 497
 498         /* If still no dev_part_str, it's an error */
 499         if (!dev_part_str) {
 500                 printf("** No device specified **\n");
 501                 goto cleanup;
 502         }
 503
 504         /* Separate device and partition ID specification */
 505         part_str = strchr(dev_part_str, ':');
 506         if (part_str) {
 507                 dup_str = strdup(dev_part_str);
 508                 dup_str[part_str - dev_part_str] = 0;
 509                 dev_str = dup_str;
 510                 part_str++;
 511         } else {
 512                 dev_str = dev_part_str;
 513         }
 514
 515         /* Look up the device */
 516         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
 517         if (dev < 0)
 518                 goto cleanup;
 519
 520         /* Convert partition ID string to number */
 521         if (!part_str || !*part_str) {
 522                 part = PART_UNSPECIFIED;
 523         } else if (!strcmp(part_str, "auto")) {
 524                 part = PART_AUTO;
 525         } else {
 526                 /* Something specified -> use exactly that */
 527                 part = (int)simple_strtoul(part_str, &ep, 16);
 528                 /*
 529                  * Less than whole string converted,
 530                  * or request for whole device, but caller requires partition.
 531                  */
 532                 if (*ep || (part == 0 && !allow_whole_dev)) {
 533                         printf("** Bad partition specification %s %s **\n",
 534                             ifname, dev_part_str);
 535                         goto cleanup;
 536                 }
 537         }
 538
 539         /*
 540          * No partition table on device,
 541          * or user requested partition 0 (entire device).
 542          */
 543         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
 544             (part == 0)) {
 545                 if (!(*dev_desc)->lba) {
 546                         printf("** Bad device size - %s %s **\n", ifname,
 547                                dev_str);
 548                         goto cleanup;
 549                 }
 550
 551                 /*
 552                  * If user specified a partition ID other than 0,
 553                  * or the calling command only accepts partitions,
 554                  * it's an error.
 555                  */
 556                 if ((part > 0) || (!allow_whole_dev)) {
 557                         printf("** No partition table - %s %s **\n", ifname,
 558                                dev_str);
 559                         goto cleanup;
 560                 }
 561
 562                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 563
 564                 part_get_info_whole_disk(*dev_desc, info);
 565
 566                 ret = 0;
 567                 goto cleanup;
 568         }
 569
 570         /*
 571          * Now there's known to be a partition table,
 572          * not specifying a partition means to pick partition 1.
 573          */
 574         if (part == PART_UNSPECIFIED)
 575                 part = 1;
 576
 577         /*
 578          * If user didn't specify a partition number, or did specify something
 579          * other than "auto", use that partition number directly.
 580          */
 581         if (part != PART_AUTO) {
 582                 ret = part_get_info(*dev_desc, part, info);
 583                 if (ret) {
 584                         printf("** Invalid partition %d **\n", part);
 585                         goto cleanup;
 586                 }
 587         } else {
 588                 /*
 589                  * Find the first bootable partition.
 590                  * If none are bootable, fall back to the first valid partition.
 591                  */
 592                 part = 0;
 593                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 594                         ret = part_get_info(*dev_desc, p, info);
 595                         if (ret)
 596                                 continue;
 597
 598                         /*
 599                          * First valid partition, or new better partition?
 600                          * If so, save partition ID.
 601                          */
 602                         if (!part || info->bootable)
 603                                 part = p;
 604
 605                         /* Best possible partition? Stop searching. */
 606                         if (info->bootable)
 607                                 break;
 608
 609                         /*
 610                          * We now need to search further for best possible.
 611                          * If we what we just queried was the best so far,
 612                          * save the info since we over-write it next loop.
 613                          */
 614                         if (part == p)
 615                                 tmpinfo = *info;
 616                 }
 617                 /* If we found any acceptable partition */
 618                 if (part) {
 619                         /*
 620                          * If we searched all possible partition IDs,
 621                          * return the first valid partition we found.
 622                          */
 623                         if (p == MAX_SEARCH_PARTITIONS + 1)
 624                                 *info = tmpinfo;
 625                 } else {
 626                         printf("** No valid partitions found **\n");
 627                         ret = -1;
 628                         goto cleanup;
 629                 }
 630         }
 631         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 632                 printf("** Invalid partition type \"%.32s\""
 633                         " (expect \"" BOOT_PART_TYPE "\")\n",
 634                         info->type);
 635                 ret  = -1;
 636                 goto cleanup;
 637         }
 638
 639         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 640
 641         ret = part;
 642         goto cleanup;
 643
 644 cleanup:
 645         free(dup_str);
 646         return ret;
 647 }
 648
 649 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 650                                struct disk_partition *info, int part_type)
 651 {
 652         struct part_driver *part_drv;
 653         int ret;
 654         int i;
 655
 656         part_drv = part_driver_lookup_type(dev_desc);
 657         if (!part_drv)
 658                 return -1;
 659         for (i = 1; i < part_drv->max_entries; i++) {
 660                 ret = part_drv->get_info(dev_desc, i, info);
 661                 if (ret != 0) {
 662                         /* no more entries in table */
 663                         break;
 664                 }
 665                 if (strcmp(name, (const char *)info->name) == 0) {
 666                         /* matched */
 667                         return i;
 668                 }
 669         }
 670
 671         return -1;
 672 }
 673
 674 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
 675                           struct disk_partition *info)
 676 {
 677         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
 678 }
 679
 680 /**
 681  * Get partition info from device number and partition name.
 682  *
 683  * Parse a device number and partition name string in the form of
 684  * "device_num#partition_name", for example "0#misc". If the partition
 685  * is found, sets dev_desc and part_info accordingly with the information
 686  * of the partition with the given partition_name.
 687  *
 688  * @param[in] dev_iface Device interface
 689  * @param[in] dev_part_str Input string argument, like "0#misc"
 690  * @param[out] dev_desc Place to store the device description pointer
 691  * @param[out] part_info Place to store the partition information
 692  * @return 0 on success, or a negative on error
 693  */
 694 static int part_get_info_by_dev_and_name(const char *dev_iface,
 695                                          const char *dev_part_str,
 696                                          struct blk_desc **dev_desc,
 697                                          struct disk_partition *part_info)
 698 {
 699         char *ep;
 700         const char *part_str;
 701         int dev_num;
 702
 703         part_str = strchr(dev_part_str, '#');
 704         if (!part_str || part_str == dev_part_str)
 705                 return -EINVAL;
 706
 707         dev_num = simple_strtoul(dev_part_str, &ep, 16);
 708         if (ep != part_str) {
 709                 /* Not all the first part before the # was parsed. */
 710                 return -EINVAL;
 711         }
 712         part_str++;
 713
 714         *dev_desc = blk_get_dev(dev_iface, dev_num);
 715         if (!*dev_desc) {
 716                 printf("Could not find %s %d\n", dev_iface, dev_num);
 717                 return -EINVAL;
 718         }
 719         if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
 720                 printf("Could not find \"%s\" partition\n", part_str);
 721                 return -EINVAL;
 722         }
 723         return 0;
 724 }
 725
 726 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 727                                          const char *dev_part_str,
 728                                          struct blk_desc **dev_desc,
 729                                          struct disk_partition *part_info)
 730 {
 731         /* Split the part_name if passed as "$dev_num#part_name". */
 732         if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
 733                                            dev_desc, part_info))
 734                 return 0;
 735         /*
 736          * Couldn't lookup by name, try looking up the partition description
 737          * directly.
 738          */
 739         if (blk_get_device_part_str(dev_iface, dev_part_str,
 740                                     dev_desc, part_info, 1) < 0) {
 741                 printf("Couldn't find partition %s %s\n",
 742                        dev_iface, dev_part_str);
 743                 return -EINVAL;
 744         }
 745         return 0;
 746 }
 747
 748 void part_set_generic_name(const struct blk_desc *dev_desc,
 749         int part_num, char *name)
 750 {
 751         char *devtype;
 752
 753         switch (dev_desc->if_type) {
 754         case IF_TYPE_IDE:
 755         case IF_TYPE_SATA:
 756         case IF_TYPE_ATAPI:
 757                 devtype = "hd";
 758                 break;
 759         case IF_TYPE_SCSI:
 760                 devtype = "sd";
 761                 break;
 762         case IF_TYPE_USB:
 763                 devtype = "usbd";
 764                 break;
 765         case IF_TYPE_DOC:
 766                 devtype = "docd";
 767                 break;
 768         case IF_TYPE_MMC:
 769         case IF_TYPE_SD:
 770                 devtype = "mmcsd";
 771                 break;
 772         default:
 773                 devtype = "xx";
 774                 break;
 775         }
 776
 777         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
 778 }