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 #ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
 178 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 179 {
 180         lbaint_t blks;
 181
 182         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 183
 184         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 185
 186         if (blks != dev_desc->lba) {
 187                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 188                 return 1;
 189         }
 190
 191         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 192                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 193
 194         return 0;
 195 }
 196
 197 static void fb_mmc_boot1_ops(struct blk_desc *dev_desc, void *buffer,
 198                              u32 buff_sz, char *response)
 199 {
 200         lbaint_t blkcnt;
 201         lbaint_t blks;
 202         unsigned long blksz;
 203
 204         // To operate on EMMC_BOOT1 (mmc0boot0), we first change the hwpart
 205         if (blk_dselect_hwpart(dev_desc, 1)) {
 206                 pr_err("Failed to select hwpart\n");
 207                 fastboot_fail("Failed to select hwpart", response);
 208                 return;
 209         }
 210
 211         if (buffer) { /* flash */
 212
 213                 /* determine number of blocks to write */
 214                 blksz = dev_desc->blksz;
 215                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 216                 blkcnt = lldiv(blkcnt, blksz);
 217
 218                 if (blkcnt > dev_desc->lba) {
 219                         pr_err("Image size too large\n");
 220                         fastboot_fail("Image size too large", response);
 221                         return;
 222                 }
 223
 224                 debug("Start Flashing Image to EMMC_BOOT1...\n");
 225
 226                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 227
 228                 if (blks != blkcnt) {
 229                         pr_err("Failed to write EMMC_BOOT1\n");
 230                         fastboot_fail("Failed to write EMMC_BOOT1", response);
 231                         return;
 232                 }
 233
 234                 printf("........ wrote %lu bytes to EMMC_BOOT1\n",
 235                        blkcnt * blksz);
 236         } else { /* erase */
 237                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 238                         fastboot_fail("Failed to erase EMMC_BOOT1", response);
 239                         return;
 240                 }
 241         }
 242
 243         fastboot_okay(NULL, response);
 244 }
 245 #endif
 246
 247 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 248 /**
 249  * Read Android boot image header from boot partition.
 250  *
 251  * @param[in] dev_desc MMC device descriptor
 252  * @param[in] info Boot partition info
 253  * @param[out] hdr Where to store read boot image header
 254  *
 255  * @return Boot image header sectors count or 0 on error
 256  */
 257 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 258                                        struct disk_partition *info,
 259                                        struct andr_img_hdr *hdr,
 260                                        char *response)
 261 {
 262         ulong sector_size;              /* boot partition sector size */
 263         lbaint_t hdr_sectors;           /* boot image header sectors count */
 264         int res;
 265
 266         /* Calculate boot image sectors count */
 267         sector_size = info->blksz;
 268         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 269         if (hdr_sectors == 0) {
 270                 pr_err("invalid number of boot sectors: 0\n");
 271                 fastboot_fail("invalid number of boot sectors: 0", response);
 272                 return 0;
 273         }
 274
 275         /* Read the boot image header */
 276         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 277         if (res != hdr_sectors) {
 278                 pr_err("cannot read header from boot partition\n");
 279                 fastboot_fail("cannot read header from boot partition",
 280                               response);
 281                 return 0;
 282         }
 283
 284         /* Check boot header magic string */
 285         res = android_image_check_header(hdr);
 286         if (res != 0) {
 287                 pr_err("bad boot image magic\n");
 288                 fastboot_fail("boot partition not initialized", response);
 289                 return 0;
 290         }
 291
 292         return hdr_sectors;
 293 }
 294
 295 /**
 296  * Write downloaded zImage to boot partition and repack it properly.
 297  *
 298  * @param dev_desc MMC device descriptor
 299  * @param download_buffer Address to fastboot buffer with zImage in it
 300  * @param download_bytes Size of fastboot buffer, in bytes
 301  *
 302  * @return 0 on success or -1 on error
 303  */
 304 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 305                                 void *download_buffer,
 306                                 u32 download_bytes,
 307                                 char *response)
 308 {
 309         uintptr_t hdr_addr;                     /* boot image header address */
 310         struct andr_img_hdr *hdr;               /* boot image header */
 311         lbaint_t hdr_sectors;                   /* boot image header sectors */
 312         u8 *ramdisk_buffer;
 313         u32 ramdisk_sector_start;
 314         u32 ramdisk_sectors;
 315         u32 kernel_sector_start;
 316         u32 kernel_sectors;
 317         u32 sectors_per_page;
 318         struct disk_partition info;
 319         int res;
 320
 321         puts("Flashing zImage\n");
 322
 323         /* Get boot partition info */
 324         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 325         if (res < 0) {
 326                 pr_err("cannot find boot partition\n");
 327                 fastboot_fail("cannot find boot partition", response);
 328                 return -1;
 329         }
 330
 331         /* Put boot image header in fastboot buffer after downloaded zImage */
 332         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 333         hdr = (struct andr_img_hdr *)hdr_addr;
 334
 335         /* Read boot image header */
 336         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 337         if (hdr_sectors == 0) {
 338                 pr_err("unable to read boot image header\n");
 339                 fastboot_fail("unable to read boot image header", response);
 340                 return -1;
 341         }
 342
 343         /* Check if boot image has second stage in it (we don't support it) */
 344         if (hdr->second_size > 0) {
 345                 pr_err("moving second stage is not supported yet\n");
 346                 fastboot_fail("moving second stage is not supported yet",
 347                               response);
 348                 return -1;
 349         }
 350
 351         /* Extract ramdisk location */
 352         sectors_per_page = hdr->page_size / info.blksz;
 353         ramdisk_sector_start = info.start + sectors_per_page;
 354         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 355                                              sectors_per_page;
 356         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 357                                        sectors_per_page;
 358
 359         /* Read ramdisk and put it in fastboot buffer after boot image header */
 360         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 361         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 362                         ramdisk_buffer);
 363         if (res != ramdisk_sectors) {
 364                 pr_err("cannot read ramdisk from boot partition\n");
 365                 fastboot_fail("cannot read ramdisk from boot partition",
 366                               response);
 367                 return -1;
 368         }
 369
 370         /* Write new kernel size to boot image header */
 371         hdr->kernel_size = download_bytes;
 372         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 373         if (res == 0) {
 374                 pr_err("cannot writeback boot image header\n");
 375                 fastboot_fail("cannot write back boot image header", response);
 376                 return -1;
 377         }
 378
 379         /* Write the new downloaded kernel */
 380         kernel_sector_start = info.start + sectors_per_page;
 381         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 382                                       sectors_per_page;
 383         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 384                          download_buffer);
 385         if (res == 0) {
 386                 pr_err("cannot write new kernel\n");
 387                 fastboot_fail("cannot write new kernel", response);
 388                 return -1;
 389         }
 390
 391         /* Write the saved ramdisk back */
 392         ramdisk_sector_start = info.start + sectors_per_page;
 393         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 394                                              sectors_per_page;
 395         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 396                          ramdisk_buffer);
 397         if (res == 0) {
 398                 pr_err("cannot write back original ramdisk\n");
 399                 fastboot_fail("cannot write back original ramdisk", response);
 400                 return -1;
 401         }
 402
 403         puts("........ zImage was updated in boot partition\n");
 404         fastboot_okay(NULL, response);
 405         return 0;
 406 }
 407 #endif
 408
 409 /**
 410  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 411  *
 412  * @part_name: Named partition to lookup
 413  * @dev_desc: Pointer to returned blk_desc pointer
 414  * @part_info: Pointer to returned struct disk_partition
 415  * @response: Pointer to fastboot response buffer
 416  */
 417 int fastboot_mmc_get_part_info(const char *part_name,
 418                                struct blk_desc **dev_desc,
 419                                struct disk_partition *part_info, char *response)
 420 {
 421         int r = 0;
 422         int mmcpart;
 423
 424         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 425         if (!*dev_desc) {
 426                 fastboot_fail("block device not found", response);
 427                 return -ENOENT;
 428         }
 429         if (!part_name || !strcmp(part_name, "")) {
 430                 fastboot_fail("partition not given", response);
 431                 return -ENOENT;
 432         }
 433
 434         if (raw_part_get_info_by_name(*dev_desc, part_name, part_info, &mmcpart) < 0) {
 435                 r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info);
 436                 if (r < 0) {
 437                         fastboot_fail("partition not found", response);
 438                         return r;
 439                 }
 440         }
 441
 442         return r;
 443 }
 444
 445 /**
 446  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 447  *
 448  * @cmd: Named partition to write image to
 449  * @download_buffer: Pointer to image data
 450  * @download_bytes: Size of image data
 451  * @response: Pointer to fastboot response buffer
 452  */
 453 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 454                               u32 download_bytes, char *response)
 455 {
 456         struct blk_desc *dev_desc;
 457         struct disk_partition info;
 458         int mmcpart = 0;
 459
 460         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 461         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 462                 pr_err("invalid mmc device\n");
 463                 fastboot_fail("invalid mmc device", response);
 464                 return;
 465         }
 466
 467 #ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
 468         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 469                 fb_mmc_boot1_ops(dev_desc, download_buffer,
 470                                  download_bytes, response);
 471                 return;
 472         }
 473 #endif
 474
 475 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 476 #ifndef CONFIG_FASTBOOT_MMC_USER_NAME
 477         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 478 #else
 479         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0 ||
 480             strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 481 #endif
 482                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 483                        __func__);
 484                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 485                         printf("%s: invalid GPT - refusing to write to flash\n",
 486                                __func__);
 487                         fastboot_fail("invalid GPT partition", response);
 488                         return;
 489                 }
 490                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 491                         printf("%s: writing GPT partitions failed\n", __func__);
 492                         fastboot_fail("writing GPT partitions failed",
 493                                       response);
 494                         return;
 495                 }
 496                 printf("........ success\n");
 497                 fastboot_okay(NULL, response);
 498                 return;
 499         }
 500 #endif
 501
 502 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 503         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 504                 printf("%s: updating MBR\n", __func__);
 505                 if (is_valid_dos_buf(download_buffer)) {
 506                         printf("%s: invalid MBR - refusing to write to flash\n",
 507                                __func__);
 508                         fastboot_fail("invalid MBR partition", response);
 509                         return;
 510                 }
 511                 if (write_mbr_partition(dev_desc, download_buffer)) {
 512                         printf("%s: writing MBR partition failed\n", __func__);
 513                         fastboot_fail("writing MBR partition failed",
 514                                       response);
 515                         return;
 516                 }
 517                 printf("........ success\n");
 518                 fastboot_okay(NULL, response);
 519                 return;
 520         }
 521 #endif
 522
 523 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 524         if (strncasecmp(cmd, "zimage", 6) == 0) {
 525                 fb_mmc_update_zimage(dev_desc, download_buffer,
 526                                      download_bytes, response);
 527                 return;
 528         }
 529 #endif
 530
 531         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
 532                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
 533                         pr_err("Failed to select hwpart\n");
 534                         fastboot_fail("Failed to select hwpart", response);
 535                         return;
 536                 }
 537         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 538                 pr_err("cannot find partition: '%s'\n", cmd);
 539                 fastboot_fail("cannot find partition", response);
 540                 return;
 541         }
 542
 543         if (is_sparse_image(download_buffer)) {
 544                 struct fb_mmc_sparse sparse_priv;
 545                 struct sparse_storage sparse;
 546                 int err;
 547
 548                 sparse_priv.dev_desc = dev_desc;
 549
 550                 sparse.blksz = info.blksz;
 551                 sparse.start = info.start;
 552                 sparse.size = info.size;
 553                 sparse.write = fb_mmc_sparse_write;
 554                 sparse.reserve = fb_mmc_sparse_reserve;
 555                 sparse.mssg = fastboot_fail;
 556
 557                 printf("Flashing sparse image at offset " LBAFU "\n",
 558                        sparse.start);
 559
 560                 sparse.priv = &sparse_priv;
 561                 err = write_sparse_image(&sparse, cmd, download_buffer,
 562                                          response);
 563                 if (!err)
 564                         fastboot_okay(NULL, response);
 565         } else {
 566                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 567                                 download_bytes, response);
 568         }
 569 }
 570
 571 /**
 572  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 573  *
 574  * @cmd: Named partition to erase
 575  * @response: Pointer to fastboot response buffer
 576  */
 577 void fastboot_mmc_erase(const char *cmd, char *response)
 578 {
 579         struct blk_desc *dev_desc;
 580         struct disk_partition info;
 581         lbaint_t blks, blks_start, blks_size, grp_size;
 582         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 583         int mmcpart = 0;
 584
 585         if (mmc == NULL) {
 586                 pr_err("invalid mmc device\n");
 587                 fastboot_fail("invalid mmc device", response);
 588                 return;
 589         }
 590
 591         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 592         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 593                 pr_err("invalid mmc device\n");
 594                 fastboot_fail("invalid mmc device", response);
 595                 return;
 596         }
 597
 598 #ifdef CONFIG_FASTBOOT_MMC_BOOT1_SUPPORT
 599         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 600                 /* erase EMMC boot1 */
 601                 fb_mmc_boot1_ops(dev_desc, NULL, 0, response);
 602                 return;
 603         }
 604 #endif
 605
 606 #ifdef CONFIG_FASTBOOT_MMC_USER_NAME
 607         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 608                 /* erase EMMC userdata */
 609                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 610                         fastboot_fail("Failed to erase EMMC_USER", response);
 611                 else
 612                         fastboot_okay(NULL, response);
 613                 return;
 614         }
 615 #endif
 616
 617         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
 618                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
 619                         pr_err("Failed to select hwpart\n");
 620                         fastboot_fail("Failed to select hwpart", response);
 621                         return;
 622                 }
 623         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 624                 pr_err("cannot find partition: '%s'\n", cmd);
 625                 fastboot_fail("cannot find partition", response);
 626                 return;
 627         }
 628
 629         /* Align blocks to erase group size to avoid erasing other partitions */
 630         grp_size = mmc->erase_grp_size;
 631         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 632         if (info.size >= grp_size)
 633                 blks_size = (info.size - (blks_start - info.start)) &
 634                                 (~(grp_size - 1));
 635         else
 636                 blks_size = 0;
 637
 638         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 639                blks_start, blks_start + blks_size);
 640
 641         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 642
 643         if (blks != blks_size) {
 644                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 645                 fastboot_fail("failed erasing from device", response);
 646                 return;
 647         }
 648
 649         printf("........ erased " LBAFU " bytes from '%s'\n",
 650                blks_size * info.blksz, cmd);
 651         fastboot_okay(NULL, response);
 652 }