drivers/fastboot/fb_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2014 Broadcom Corporation.
   4  */
   5
   6 #include <config.h>
   7 #include <common.h>
   8 #include <blk.h>
   9 #include <env.h>
  10 #include <fastboot.h>
  11 #include <fastboot-internal.h>
  12 #include <fb_mmc.h>
  13 #include <flash.h>
  14 #include <image-sparse.h>
  15 #include <image.h>
  16 #include <log.h>
  17 #include <part.h>
  18 #include <mmc.h>
  19 #include <div64.h>
  20 #include <linux/compat.h>
  21 #include <android_image.h>
  22
  23 #define FASTBOOT_MAX_BLK_WRITE 16384
  24
  25 #define BOOT_PARTITION_NAME "boot"
  26
  27 struct fb_mmc_sparse {
  28         struct blk_desc *dev_desc;
  29 };
  30
  31 static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
  32                 const char *name, struct disk_partition *info)
  33 {
  34         int ret;
  35
  36         ret = part_get_info_by_name(dev_desc, name, info);
  37         if (ret < 0) {
  38                 /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
  39                 char env_alias_name[25 + PART_NAME_LEN + 1];
  40                 char *aliased_part_name;
  41
  42                 /* check for alias */
  43                 strcpy(env_alias_name, "fastboot_partition_alias_");
  44                 strncat(env_alias_name, name, PART_NAME_LEN);
  45                 aliased_part_name = env_get(env_alias_name);
  46                 if (aliased_part_name != NULL)
  47                         ret = part_get_info_by_name(dev_desc,
  48                                         aliased_part_name, info);
  49         }
  50         return ret;
  51 }
  52
  53 static int raw_part_get_info_by_name(struct blk_desc *dev_desc,
  54                 const char *name, struct disk_partition *info, int *mmcpart)
  55 {
  56         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
  57         char env_desc_name[23 + PART_NAME_LEN + 1];
  58         char *raw_part_desc;
  59         const char *argv[2];
  60         const char **parg = argv;
  61
  62         /* check for raw partition descriptor */
  63         strcpy(env_desc_name, "fastboot_raw_partition_");
  64         strncat(env_desc_name, name, PART_NAME_LEN);
  65         raw_part_desc = strdup(env_get(env_desc_name));
  66         if (raw_part_desc == NULL)
  67                 return -ENODEV;
  68
  69         /*
  70          * parse partition descriptor
  71          *
  72          * <lba_start> <lba_size> [mmcpart <num>]
  73          */
  74         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
  75                 *parg = strsep(&raw_part_desc, " ");
  76                 if (*parg == NULL) {
  77                         pr_err("Invalid number of arguments.\n");
  78                         return -ENODEV;
  79                 }
  80         }
  81
  82         info->start = simple_strtoul(argv[0], NULL, 0);
  83         info->size = simple_strtoul(argv[1], NULL, 0);
  84         info->blksz = dev_desc->blksz;
  85         strncpy((char *)info->name, name, PART_NAME_LEN);
  86
  87         if (raw_part_desc) {
  88                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0)
  89                         *mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
  90         }
  91
  92         return 0;
  93 }
  94
  95 /**
  96  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
  97  *
  98  * @block_dev: Pointer to block device
  99  * @start: First block to write/erase
 100  * @blkcnt: Count of blocks
 101  * @buffer: Pointer to data buffer for write or NULL for erase
 102  */
 103 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
 104                                  lbaint_t blkcnt, const void *buffer)
 105 {
 106         lbaint_t blk = start;
 107         lbaint_t blks_written;
 108         lbaint_t cur_blkcnt;
 109         lbaint_t blks = 0;
 110         int i;
 111
 112         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
 113                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
 114                 if (buffer) {
 115                         if (fastboot_progress_callback)
 116                                 fastboot_progress_callback("writing");
 117                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
 118                                                   buffer + (i * block_dev->blksz));
 119                 } else {
 120                         if (fastboot_progress_callback)
 121                                 fastboot_progress_callback("erasing");
 122                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
 123                 }
 124                 blk += blks_written;
 125                 blks += blks_written;
 126         }
 127         return blks;
 128 }
 129
 130 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 131                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 132 {
 133         struct fb_mmc_sparse *sparse = info->priv;
 134         struct blk_desc *dev_desc = sparse->dev_desc;
 135
 136         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 137 }
 138
 139 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 140                 lbaint_t blk, lbaint_t blkcnt)
 141 {
 142         return blkcnt;
 143 }
 144
 145 static void write_raw_image(struct blk_desc *dev_desc,
 146                             struct disk_partition *info, const char *part_name,
 147                             void *buffer, u32 download_bytes, char *response)
 148 {
 149         lbaint_t blkcnt;
 150         lbaint_t blks;
 151
 152         /* determine number of blocks to write */
 153         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 154         blkcnt = lldiv(blkcnt, info->blksz);
 155
 156         if (blkcnt > info->size) {
 157                 pr_err("too large for partition: '%s'\n", part_name);
 158                 fastboot_fail("too large for partition", response);
 159                 return;
 160         }
 161
 162         puts("Flashing Raw Image\n");
 163
 164         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
 165
 166         if (blks != blkcnt) {
 167                 pr_err("failed writing to device %d\n", dev_desc->devnum);
 168                 fastboot_fail("failed writing to device", response);
 169                 return;
 170         }
 171
 172         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 173                part_name);
 174         fastboot_okay(NULL, response);
 175 }
 176
 177 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
 178         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 179 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 180 {
 181         lbaint_t blks;
 182
 183         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 184
 185         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 186
 187         if (blks != dev_desc->lba) {
 188                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 189                 return 1;
 190         }
 191
 192         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 193                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 194
 195         return 0;
 196 }
 197 #endif
 198
 199 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 200 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
 201                             int hwpart, u32 buff_sz, char *response)
 202 {
 203         lbaint_t blkcnt;
 204         lbaint_t blks;
 205         unsigned long blksz;
 206
 207         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
 208         if (blk_dselect_hwpart(dev_desc, hwpart)) {
 209                 pr_err("Failed to select hwpart\n");
 210                 fastboot_fail("Failed to select hwpart", response);
 211                 return;
 212         }
 213
 214         if (buffer) { /* flash */
 215
 216                 /* determine number of blocks to write */
 217                 blksz = dev_desc->blksz;
 218                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 219                 blkcnt = lldiv(blkcnt, blksz);
 220
 221                 if (blkcnt > dev_desc->lba) {
 222                         pr_err("Image size too large\n");
 223                         fastboot_fail("Image size too large", response);
 224                         return;
 225                 }
 226
 227                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
 228
 229                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 230
 231                 if (blks != blkcnt) {
 232                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
 233                         fastboot_fail("Failed to write EMMC_BOOT part",
 234                                       response);
 235                         return;
 236                 }
 237
 238                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
 239                        blkcnt * blksz, hwpart);
 240         } else { /* erase */
 241                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 242                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
 243                         fastboot_fail("Failed to erase EMMC_BOOT part",
 244                                       response);
 245                         return;
 246                 }
 247         }
 248
 249         fastboot_okay(NULL, response);
 250 }
 251 #endif
 252
 253 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 254 /**
 255  * Read Android boot image header from boot partition.
 256  *
 257  * @param[in] dev_desc MMC device descriptor
 258  * @param[in] info Boot partition info
 259  * @param[out] hdr Where to store read boot image header
 260  *
 261  * @return Boot image header sectors count or 0 on error
 262  */
 263 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 264                                        struct disk_partition *info,
 265                                        struct andr_img_hdr *hdr,
 266                                        char *response)
 267 {
 268         ulong sector_size;              /* boot partition sector size */
 269         lbaint_t hdr_sectors;           /* boot image header sectors count */
 270         int res;
 271
 272         /* Calculate boot image sectors count */
 273         sector_size = info->blksz;
 274         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 275         if (hdr_sectors == 0) {
 276                 pr_err("invalid number of boot sectors: 0\n");
 277                 fastboot_fail("invalid number of boot sectors: 0", response);
 278                 return 0;
 279         }
 280
 281         /* Read the boot image header */
 282         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 283         if (res != hdr_sectors) {
 284                 pr_err("cannot read header from boot partition\n");
 285                 fastboot_fail("cannot read header from boot partition",
 286                               response);
 287                 return 0;
 288         }
 289
 290         /* Check boot header magic string */
 291         res = android_image_check_header(hdr);
 292         if (res != 0) {
 293                 pr_err("bad boot image magic\n");
 294                 fastboot_fail("boot partition not initialized", response);
 295                 return 0;
 296         }
 297
 298         return hdr_sectors;
 299 }
 300
 301 /**
 302  * Write downloaded zImage to boot partition and repack it properly.
 303  *
 304  * @param dev_desc MMC device descriptor
 305  * @param download_buffer Address to fastboot buffer with zImage in it
 306  * @param download_bytes Size of fastboot buffer, in bytes
 307  *
 308  * @return 0 on success or -1 on error
 309  */
 310 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 311                                 void *download_buffer,
 312                                 u32 download_bytes,
 313                                 char *response)
 314 {
 315         uintptr_t hdr_addr;                     /* boot image header address */
 316         struct andr_img_hdr *hdr;               /* boot image header */
 317         lbaint_t hdr_sectors;                   /* boot image header sectors */
 318         u8 *ramdisk_buffer;
 319         u32 ramdisk_sector_start;
 320         u32 ramdisk_sectors;
 321         u32 kernel_sector_start;
 322         u32 kernel_sectors;
 323         u32 sectors_per_page;
 324         struct disk_partition info;
 325         int res;
 326
 327         puts("Flashing zImage\n");
 328
 329         /* Get boot partition info */
 330         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 331         if (res < 0) {
 332                 pr_err("cannot find boot partition\n");
 333                 fastboot_fail("cannot find boot partition", response);
 334                 return -1;
 335         }
 336
 337         /* Put boot image header in fastboot buffer after downloaded zImage */
 338         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 339         hdr = (struct andr_img_hdr *)hdr_addr;
 340
 341         /* Read boot image header */
 342         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 343         if (hdr_sectors == 0) {
 344                 pr_err("unable to read boot image header\n");
 345                 fastboot_fail("unable to read boot image header", response);
 346                 return -1;
 347         }
 348
 349         /* Check if boot image has second stage in it (we don't support it) */
 350         if (hdr->second_size > 0) {
 351                 pr_err("moving second stage is not supported yet\n");
 352                 fastboot_fail("moving second stage is not supported yet",
 353                               response);
 354                 return -1;
 355         }
 356
 357         /* Extract ramdisk location */
 358         sectors_per_page = hdr->page_size / info.blksz;
 359         ramdisk_sector_start = info.start + sectors_per_page;
 360         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 361                                              sectors_per_page;
 362         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 363                                        sectors_per_page;
 364
 365         /* Read ramdisk and put it in fastboot buffer after boot image header */
 366         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 367         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 368                         ramdisk_buffer);
 369         if (res != ramdisk_sectors) {
 370                 pr_err("cannot read ramdisk from boot partition\n");
 371                 fastboot_fail("cannot read ramdisk from boot partition",
 372                               response);
 373                 return -1;
 374         }
 375
 376         /* Write new kernel size to boot image header */
 377         hdr->kernel_size = download_bytes;
 378         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 379         if (res == 0) {
 380                 pr_err("cannot writeback boot image header\n");
 381                 fastboot_fail("cannot write back boot image header", response);
 382                 return -1;
 383         }
 384
 385         /* Write the new downloaded kernel */
 386         kernel_sector_start = info.start + sectors_per_page;
 387         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 388                                       sectors_per_page;
 389         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 390                          download_buffer);
 391         if (res == 0) {
 392                 pr_err("cannot write new kernel\n");
 393                 fastboot_fail("cannot write new kernel", response);
 394                 return -1;
 395         }
 396
 397         /* Write the saved ramdisk back */
 398         ramdisk_sector_start = info.start + sectors_per_page;
 399         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 400                                              sectors_per_page;
 401         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 402                          ramdisk_buffer);
 403         if (res == 0) {
 404                 pr_err("cannot write back original ramdisk\n");
 405                 fastboot_fail("cannot write back original ramdisk", response);
 406                 return -1;
 407         }
 408
 409         puts("........ zImage was updated in boot partition\n");
 410         fastboot_okay(NULL, response);
 411         return 0;
 412 }
 413 #endif
 414
 415 /**
 416  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 417  *
 418  * @part_name: Named partition to lookup
 419  * @dev_desc: Pointer to returned blk_desc pointer
 420  * @part_info: Pointer to returned struct disk_partition
 421  * @response: Pointer to fastboot response buffer
 422  */
 423 int fastboot_mmc_get_part_info(const char *part_name,
 424                                struct blk_desc **dev_desc,
 425                                struct disk_partition *part_info, char *response)
 426 {
 427         int r = 0;
 428         int mmcpart;
 429
 430         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 431         if (!*dev_desc) {
 432                 fastboot_fail("block device not found", response);
 433                 return -ENOENT;
 434         }
 435         if (!part_name || !strcmp(part_name, "")) {
 436                 fastboot_fail("partition not given", response);
 437                 return -ENOENT;
 438         }
 439
 440         if (raw_part_get_info_by_name(*dev_desc, part_name, part_info, &mmcpart) < 0) {
 441                 r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info);
 442                 if (r < 0) {
 443                         fastboot_fail("partition not found", response);
 444                         return r;
 445                 }
 446         }
 447
 448         return r;
 449 }
 450
 451 /**
 452  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 453  *
 454  * @cmd: Named partition to write image to
 455  * @download_buffer: Pointer to image data
 456  * @download_bytes: Size of image data
 457  * @response: Pointer to fastboot response buffer
 458  */
 459 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 460                               u32 download_bytes, char *response)
 461 {
 462         struct blk_desc *dev_desc;
 463         struct disk_partition info;
 464         int mmcpart = 0;
 465
 466         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 467         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 468                 pr_err("invalid mmc device\n");
 469                 fastboot_fail("invalid mmc device", response);
 470                 return;
 471         }
 472
 473 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 474         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 475                 fb_mmc_boot_ops(dev_desc, download_buffer, 1,
 476                                 download_bytes, response);
 477                 return;
 478         }
 479         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 480                 fb_mmc_boot_ops(dev_desc, download_buffer, 2,
 481                                 download_bytes, response);
 482                 return;
 483         }
 484 #endif
 485
 486 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 487 #ifndef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 488         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 489 #else
 490         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0 ||
 491             strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 492 #endif
 493                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 494                        __func__);
 495                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 496                         printf("%s: invalid GPT - refusing to write to flash\n",
 497                                __func__);
 498                         fastboot_fail("invalid GPT partition", response);
 499                         return;
 500                 }
 501                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 502                         printf("%s: writing GPT partitions failed\n", __func__);
 503                         fastboot_fail("writing GPT partitions failed",
 504                                       response);
 505                         return;
 506                 }
 507                 part_init(dev_desc);
 508                 printf("........ success\n");
 509                 fastboot_okay(NULL, response);
 510                 return;
 511         }
 512 #endif
 513
 514 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 515         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 516                 printf("%s: updating MBR\n", __func__);
 517                 if (is_valid_dos_buf(download_buffer)) {
 518                         printf("%s: invalid MBR - refusing to write to flash\n",
 519                                __func__);
 520                         fastboot_fail("invalid MBR partition", response);
 521                         return;
 522                 }
 523                 if (write_mbr_sector(dev_desc, download_buffer)) {
 524                         printf("%s: writing MBR partition failed\n", __func__);
 525                         fastboot_fail("writing MBR partition failed",
 526                                       response);
 527                         return;
 528                 }
 529                 part_init(dev_desc);
 530                 printf("........ success\n");
 531                 fastboot_okay(NULL, response);
 532                 return;
 533         }
 534 #endif
 535
 536 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 537         if (strncasecmp(cmd, "zimage", 6) == 0) {
 538                 fb_mmc_update_zimage(dev_desc, download_buffer,
 539                                      download_bytes, response);
 540                 return;
 541         }
 542 #endif
 543
 544         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
 545                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
 546                         pr_err("Failed to select hwpart\n");
 547                         fastboot_fail("Failed to select hwpart", response);
 548                         return;
 549                 }
 550         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 551                 pr_err("cannot find partition: '%s'\n", cmd);
 552                 fastboot_fail("cannot find partition", response);
 553                 return;
 554         }
 555
 556         if (is_sparse_image(download_buffer)) {
 557                 struct fb_mmc_sparse sparse_priv;
 558                 struct sparse_storage sparse;
 559                 int err;
 560
 561                 sparse_priv.dev_desc = dev_desc;
 562
 563                 sparse.blksz = info.blksz;
 564                 sparse.start = info.start;
 565                 sparse.size = info.size;
 566                 sparse.write = fb_mmc_sparse_write;
 567                 sparse.reserve = fb_mmc_sparse_reserve;
 568                 sparse.mssg = fastboot_fail;
 569
 570                 printf("Flashing sparse image at offset " LBAFU "\n",
 571                        sparse.start);
 572
 573                 sparse.priv = &sparse_priv;
 574                 err = write_sparse_image(&sparse, cmd, download_buffer,
 575                                          response);
 576                 if (!err)
 577                         fastboot_okay(NULL, response);
 578         } else {
 579                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 580                                 download_bytes, response);
 581         }
 582 }
 583
 584 /**
 585  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 586  *
 587  * @cmd: Named partition to erase
 588  * @response: Pointer to fastboot response buffer
 589  */
 590 void fastboot_mmc_erase(const char *cmd, char *response)
 591 {
 592         struct blk_desc *dev_desc;
 593         struct disk_partition info;
 594         lbaint_t blks, blks_start, blks_size, grp_size;
 595         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 596         int mmcpart = 0;
 597
 598         if (mmc == NULL) {
 599                 pr_err("invalid mmc device\n");
 600                 fastboot_fail("invalid mmc device", response);
 601                 return;
 602         }
 603
 604         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 605         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 606                 pr_err("invalid mmc device\n");
 607                 fastboot_fail("invalid mmc device", response);
 608                 return;
 609         }
 610
 611 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 612         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 613                 /* erase EMMC boot1 */
 614                 fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
 615                 return;
 616         }
 617         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 618                 /* erase EMMC boot2 */
 619                 fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
 620                 return;
 621         }
 622 #endif
 623
 624 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 625         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 626                 /* erase EMMC userdata */
 627                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 628                         fastboot_fail("Failed to erase EMMC_USER", response);
 629                 else
 630                         fastboot_okay(NULL, response);
 631                 return;
 632         }
 633 #endif
 634
 635         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
 636                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
 637                         pr_err("Failed to select hwpart\n");
 638                         fastboot_fail("Failed to select hwpart", response);
 639                         return;
 640                 }
 641         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 642                 pr_err("cannot find partition: '%s'\n", cmd);
 643                 fastboot_fail("cannot find partition", response);
 644                 return;
 645         }
 646
 647         /* Align blocks to erase group size to avoid erasing other partitions */
 648         grp_size = mmc->erase_grp_size;
 649         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 650         if (info.size >= grp_size)
 651                 blks_size = (info.size - (blks_start - info.start)) &
 652                                 (~(grp_size - 1));
 653         else
 654                 blks_size = 0;
 655
 656         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 657                blks_start, blks_start + blks_size);
 658
 659         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 660
 661         if (blks != blks_size) {
 662                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 663                 fastboot_fail("failed erasing from device", response);
 664                 return;
 665         }
 666
 667         printf("........ erased " LBAFU " bytes from '%s'\n",
 668                blks_size * info.blksz, cmd);
 669         fastboot_okay(NULL, response);
 670 }