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 raw_part_get_info_by_name(struct blk_desc *dev_desc,
  32                                      const char *name,
  33                                      struct disk_partition *info)
  34 {
  35         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
  36         char env_desc_name[23 + PART_NAME_LEN + 1];
  37         char *raw_part_desc;
  38         const char *argv[2];
  39         const char **parg = argv;
  40
  41         /* check for raw partition descriptor */
  42         strcpy(env_desc_name, "fastboot_raw_partition_");
  43         strlcat(env_desc_name, name, sizeof(env_desc_name));
  44         raw_part_desc = strdup(env_get(env_desc_name));
  45         if (raw_part_desc == NULL)
  46                 return -ENODEV;
  47
  48         /*
  49          * parse partition descriptor
  50          *
  51          * <lba_start> <lba_size> [mmcpart <num>]
  52          */
  53         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
  54                 *parg = strsep(&raw_part_desc, " ");
  55                 if (*parg == NULL) {
  56                         pr_err("Invalid number of arguments.\n");
  57                         return -ENODEV;
  58                 }
  59         }
  60
  61         info->start = simple_strtoul(argv[0], NULL, 0);
  62         info->size = simple_strtoul(argv[1], NULL, 0);
  63         info->blksz = dev_desc->blksz;
  64         strlcpy((char *)info->name, name, PART_NAME_LEN);
  65
  66         if (raw_part_desc) {
  67                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) {
  68                         ulong mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
  69                         int ret = blk_dselect_hwpart(dev_desc, mmcpart);
  70
  71                         if (ret)
  72                                 return ret;
  73                 }
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int do_get_part_info(struct blk_desc **dev_desc, const char *name,
  80                             struct disk_partition *info)
  81 {
  82         int ret;
  83
  84         /* First try partition names on the default device */
  85         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
  86         if (*dev_desc) {
  87                 ret = part_get_info_by_name(*dev_desc, name, info);
  88                 if (ret >= 0)
  89                         return ret;
  90
  91                 /* Then try raw partitions */
  92                 ret = raw_part_get_info_by_name(*dev_desc, name, info);
  93                 if (ret >= 0)
  94                         return ret;
  95         }
  96
  97         /* Then try dev.hwpart:part */
  98         ret = part_get_info_by_dev_and_name_or_num("mmc", name, dev_desc,
  99                                                    info, true);
 100         return ret;
 101 }
 102
 103 static int part_get_info_by_name_or_alias(struct blk_desc **dev_desc,
 104                                           const char *name,
 105                                           struct disk_partition *info)
 106 {
 107         /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
 108         char env_alias_name[25 + PART_NAME_LEN + 1];
 109         char *aliased_part_name;
 110
 111         /* check for alias */
 112         strlcpy(env_alias_name, "fastboot_partition_alias_", sizeof(env_alias_name));
 113         strlcat(env_alias_name, name, sizeof(env_alias_name));
 114         aliased_part_name = env_get(env_alias_name);
 115         if (aliased_part_name)
 116                 name = aliased_part_name;
 117
 118         return do_get_part_info(dev_desc, name, info);
 119 }
 120
 121 /**
 122  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
 123  *
 124  * @block_dev: Pointer to block device
 125  * @start: First block to write/erase
 126  * @blkcnt: Count of blocks
 127  * @buffer: Pointer to data buffer for write or NULL for erase
 128  */
 129 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
 130                                  lbaint_t blkcnt, const void *buffer)
 131 {
 132         lbaint_t blk = start;
 133         lbaint_t blks_written;
 134         lbaint_t cur_blkcnt;
 135         lbaint_t blks = 0;
 136         int i;
 137
 138         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
 139                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
 140                 if (buffer) {
 141                         if (fastboot_progress_callback)
 142                                 fastboot_progress_callback("writing");
 143                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
 144                                                   buffer + (i * block_dev->blksz));
 145                 } else {
 146                         if (fastboot_progress_callback)
 147                                 fastboot_progress_callback("erasing");
 148                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
 149                 }
 150                 blk += blks_written;
 151                 blks += blks_written;
 152         }
 153         return blks;
 154 }
 155
 156 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 157                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 158 {
 159         struct fb_mmc_sparse *sparse = info->priv;
 160         struct blk_desc *dev_desc = sparse->dev_desc;
 161
 162         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 163 }
 164
 165 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 166                 lbaint_t blk, lbaint_t blkcnt)
 167 {
 168         return blkcnt;
 169 }
 170
 171 static void write_raw_image(struct blk_desc *dev_desc,
 172                             struct disk_partition *info, const char *part_name,
 173                             void *buffer, u32 download_bytes, char *response)
 174 {
 175         lbaint_t blkcnt;
 176         lbaint_t blks;
 177
 178         /* determine number of blocks to write */
 179         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 180         blkcnt = lldiv(blkcnt, info->blksz);
 181
 182         if (blkcnt > info->size) {
 183                 pr_err("too large for partition: '%s'\n", part_name);
 184                 fastboot_fail("too large for partition", response);
 185                 return;
 186         }
 187
 188         puts("Flashing Raw Image\n");
 189
 190         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
 191
 192         if (blks != blkcnt) {
 193                 pr_err("failed writing to device %d\n", dev_desc->devnum);
 194                 fastboot_fail("failed writing to device", response);
 195                 return;
 196         }
 197
 198         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 199                part_name);
 200         fastboot_okay(NULL, response);
 201 }
 202
 203 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
 204         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 205 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 206 {
 207         lbaint_t blks;
 208
 209         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 210
 211         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 212
 213         if (blks != dev_desc->lba) {
 214                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 215                 return 1;
 216         }
 217
 218         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 219                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 220
 221         return 0;
 222 }
 223 #endif
 224
 225 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 226 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
 227                             int hwpart, u32 buff_sz, char *response)
 228 {
 229         lbaint_t blkcnt;
 230         lbaint_t blks;
 231         unsigned long blksz;
 232
 233         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
 234         if (blk_dselect_hwpart(dev_desc, hwpart)) {
 235                 pr_err("Failed to select hwpart\n");
 236                 fastboot_fail("Failed to select hwpart", response);
 237                 return;
 238         }
 239
 240         if (buffer) { /* flash */
 241
 242                 /* determine number of blocks to write */
 243                 blksz = dev_desc->blksz;
 244                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 245                 blkcnt = lldiv(blkcnt, blksz);
 246
 247                 if (blkcnt > dev_desc->lba) {
 248                         pr_err("Image size too large\n");
 249                         fastboot_fail("Image size too large", response);
 250                         return;
 251                 }
 252
 253                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
 254
 255                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 256
 257                 if (blks != blkcnt) {
 258                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
 259                         fastboot_fail("Failed to write EMMC_BOOT part",
 260                                       response);
 261                         return;
 262                 }
 263
 264                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
 265                        blkcnt * blksz, hwpart);
 266         } else { /* erase */
 267                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 268                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
 269                         fastboot_fail("Failed to erase EMMC_BOOT part",
 270                                       response);
 271                         return;
 272                 }
 273         }
 274
 275         fastboot_okay(NULL, response);
 276 }
 277 #endif
 278
 279 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 280 /**
 281  * Read Android boot image header from boot partition.
 282  *
 283  * @param[in] dev_desc MMC device descriptor
 284  * @param[in] info Boot partition info
 285  * @param[out] hdr Where to store read boot image header
 286  *
 287  * Return: Boot image header sectors count or 0 on error
 288  */
 289 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 290                                        struct disk_partition *info,
 291                                        struct andr_img_hdr *hdr,
 292                                        char *response)
 293 {
 294         ulong sector_size;              /* boot partition sector size */
 295         lbaint_t hdr_sectors;           /* boot image header sectors count */
 296         int res;
 297
 298         /* Calculate boot image sectors count */
 299         sector_size = info->blksz;
 300         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 301         if (hdr_sectors == 0) {
 302                 pr_err("invalid number of boot sectors: 0\n");
 303                 fastboot_fail("invalid number of boot sectors: 0", response);
 304                 return 0;
 305         }
 306
 307         /* Read the boot image header */
 308         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 309         if (res != hdr_sectors) {
 310                 pr_err("cannot read header from boot partition\n");
 311                 fastboot_fail("cannot read header from boot partition",
 312                               response);
 313                 return 0;
 314         }
 315
 316         /* Check boot header magic string */
 317         res = android_image_check_header(hdr);
 318         if (res != 0) {
 319                 pr_err("bad boot image magic\n");
 320                 fastboot_fail("boot partition not initialized", response);
 321                 return 0;
 322         }
 323
 324         return hdr_sectors;
 325 }
 326
 327 /**
 328  * Write downloaded zImage to boot partition and repack it properly.
 329  *
 330  * @param dev_desc MMC device descriptor
 331  * @param download_buffer Address to fastboot buffer with zImage in it
 332  * @param download_bytes Size of fastboot buffer, in bytes
 333  *
 334  * Return: 0 on success or -1 on error
 335  */
 336 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 337                                 void *download_buffer,
 338                                 u32 download_bytes,
 339                                 char *response)
 340 {
 341         uintptr_t hdr_addr;                     /* boot image header address */
 342         struct andr_img_hdr *hdr;               /* boot image header */
 343         lbaint_t hdr_sectors;                   /* boot image header sectors */
 344         u8 *ramdisk_buffer;
 345         u32 ramdisk_sector_start;
 346         u32 ramdisk_sectors;
 347         u32 kernel_sector_start;
 348         u32 kernel_sectors;
 349         u32 sectors_per_page;
 350         struct disk_partition info;
 351         int res;
 352
 353         puts("Flashing zImage\n");
 354
 355         /* Get boot partition info */
 356         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 357         if (res < 0) {
 358                 pr_err("cannot find boot partition\n");
 359                 fastboot_fail("cannot find boot partition", response);
 360                 return -1;
 361         }
 362
 363         /* Put boot image header in fastboot buffer after downloaded zImage */
 364         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 365         hdr = (struct andr_img_hdr *)hdr_addr;
 366
 367         /* Read boot image header */
 368         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 369         if (hdr_sectors == 0) {
 370                 pr_err("unable to read boot image header\n");
 371                 fastboot_fail("unable to read boot image header", response);
 372                 return -1;
 373         }
 374
 375         /* Check if boot image has second stage in it (we don't support it) */
 376         if (hdr->second_size > 0) {
 377                 pr_err("moving second stage is not supported yet\n");
 378                 fastboot_fail("moving second stage is not supported yet",
 379                               response);
 380                 return -1;
 381         }
 382
 383         /* Extract ramdisk location */
 384         sectors_per_page = hdr->page_size / info.blksz;
 385         ramdisk_sector_start = info.start + sectors_per_page;
 386         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 387                                              sectors_per_page;
 388         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 389                                        sectors_per_page;
 390
 391         /* Read ramdisk and put it in fastboot buffer after boot image header */
 392         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 393         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 394                         ramdisk_buffer);
 395         if (res != ramdisk_sectors) {
 396                 pr_err("cannot read ramdisk from boot partition\n");
 397                 fastboot_fail("cannot read ramdisk from boot partition",
 398                               response);
 399                 return -1;
 400         }
 401
 402         /* Write new kernel size to boot image header */
 403         hdr->kernel_size = download_bytes;
 404         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 405         if (res == 0) {
 406                 pr_err("cannot writeback boot image header\n");
 407                 fastboot_fail("cannot write back boot image header", response);
 408                 return -1;
 409         }
 410
 411         /* Write the new downloaded kernel */
 412         kernel_sector_start = info.start + sectors_per_page;
 413         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 414                                       sectors_per_page;
 415         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 416                          download_buffer);
 417         if (res == 0) {
 418                 pr_err("cannot write new kernel\n");
 419                 fastboot_fail("cannot write new kernel", response);
 420                 return -1;
 421         }
 422
 423         /* Write the saved ramdisk back */
 424         ramdisk_sector_start = info.start + sectors_per_page;
 425         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 426                                              sectors_per_page;
 427         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 428                          ramdisk_buffer);
 429         if (res == 0) {
 430                 pr_err("cannot write back original ramdisk\n");
 431                 fastboot_fail("cannot write back original ramdisk", response);
 432                 return -1;
 433         }
 434
 435         puts("........ zImage was updated in boot partition\n");
 436         fastboot_okay(NULL, response);
 437         return 0;
 438 }
 439 #endif
 440
 441 /**
 442  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 443  *
 444  * @part_name: Named partition to lookup
 445  * @dev_desc: Pointer to returned blk_desc pointer
 446  * @part_info: Pointer to returned struct disk_partition
 447  * @response: Pointer to fastboot response buffer
 448  */
 449 int fastboot_mmc_get_part_info(const char *part_name,
 450                                struct blk_desc **dev_desc,
 451                                struct disk_partition *part_info, char *response)
 452 {
 453         int ret;
 454
 455         if (!part_name || !strcmp(part_name, "")) {
 456                 fastboot_fail("partition not given", response);
 457                 return -ENOENT;
 458         }
 459
 460         ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
 461         if (ret < 0) {
 462                 switch (ret) {
 463                 case -ENOSYS:
 464                 case -EINVAL:
 465                         fastboot_fail("invalid partition or device", response);
 466                         break;
 467                 case -ENODEV:
 468                         fastboot_fail("no such device", response);
 469                         break;
 470                 case -ENOENT:
 471                         fastboot_fail("no such partition", response);
 472                         break;
 473                 case -EPROTONOSUPPORT:
 474                         fastboot_fail("unknown partition table type", response);
 475                         break;
 476                 default:
 477                         fastboot_fail("unanticipated error", response);
 478                         break;
 479                 }
 480         }
 481
 482         return ret;
 483 }
 484
 485 static struct blk_desc *fastboot_mmc_get_dev(char *response)
 486 {
 487         struct blk_desc *ret = blk_get_dev("mmc",
 488                                            CONFIG_FASTBOOT_FLASH_MMC_DEV);
 489
 490         if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
 491                 pr_err("invalid mmc device\n");
 492                 fastboot_fail("invalid mmc device", response);
 493                 return NULL;
 494         }
 495         return ret;
 496 }
 497
 498 /**
 499  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 500  *
 501  * @cmd: Named partition to write image to
 502  * @download_buffer: Pointer to image data
 503  * @download_bytes: Size of image data
 504  * @response: Pointer to fastboot response buffer
 505  */
 506 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 507                               u32 download_bytes, char *response)
 508 {
 509         struct blk_desc *dev_desc;
 510         struct disk_partition info = {0};
 511
 512 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 513         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 514                 dev_desc = fastboot_mmc_get_dev(response);
 515                 if (dev_desc)
 516                         fb_mmc_boot_ops(dev_desc, download_buffer, 1,
 517                                         download_bytes, response);
 518                 return;
 519         }
 520         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 521                 dev_desc = fastboot_mmc_get_dev(response);
 522                 if (dev_desc)
 523                         fb_mmc_boot_ops(dev_desc, download_buffer, 2,
 524                                         download_bytes, response);
 525                 return;
 526         }
 527 #endif
 528
 529 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 530         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 531                 dev_desc = fastboot_mmc_get_dev(response);
 532                 if (!dev_desc)
 533                         return;
 534
 535                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 536                        __func__);
 537                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 538                         printf("%s: invalid GPT - refusing to write to flash\n",
 539                                __func__);
 540                         fastboot_fail("invalid GPT partition", response);
 541                         return;
 542                 }
 543                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 544                         printf("%s: writing GPT partitions failed\n", __func__);
 545                         fastboot_fail("writing GPT partitions failed",
 546                                       response);
 547                         return;
 548                 }
 549                 part_init(dev_desc);
 550                 printf("........ success\n");
 551                 fastboot_okay(NULL, response);
 552                 return;
 553         }
 554 #endif
 555
 556 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 557         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 558                 dev_desc = fastboot_mmc_get_dev(response);
 559                 if (!dev_desc)
 560                         return;
 561
 562                 printf("%s: updating MBR\n", __func__);
 563                 if (is_valid_dos_buf(download_buffer)) {
 564                         printf("%s: invalid MBR - refusing to write to flash\n",
 565                                __func__);
 566                         fastboot_fail("invalid MBR partition", response);
 567                         return;
 568                 }
 569                 if (write_mbr_sector(dev_desc, download_buffer)) {
 570                         printf("%s: writing MBR partition failed\n", __func__);
 571                         fastboot_fail("writing MBR partition failed",
 572                                       response);
 573                         return;
 574                 }
 575                 part_init(dev_desc);
 576                 printf("........ success\n");
 577                 fastboot_okay(NULL, response);
 578                 return;
 579         }
 580 #endif
 581
 582 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 583         if (strncasecmp(cmd, "zimage", 6) == 0) {
 584                 dev_desc = fastboot_mmc_get_dev(response);
 585                 if (dev_desc)
 586                         fb_mmc_update_zimage(dev_desc, download_buffer,
 587                                              download_bytes, response);
 588                 return;
 589         }
 590 #endif
 591
 592 #if CONFIG_IS_ENABLED(FASTBOOT_MMC_USER_SUPPORT)
 593         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 594                 dev_desc = fastboot_mmc_get_dev(response);
 595                 if (!dev_desc)
 596                         return;
 597
 598                 strlcpy((char *)&info.name, cmd, sizeof(info.name));
 599                 info.size       = dev_desc->lba;
 600                 info.blksz      = dev_desc->blksz;
 601         }
 602 #endif
 603
 604         if (!info.name[0] &&
 605             fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 606                 return;
 607
 608         if (is_sparse_image(download_buffer)) {
 609                 struct fb_mmc_sparse sparse_priv;
 610                 struct sparse_storage sparse;
 611                 int err;
 612
 613                 sparse_priv.dev_desc = dev_desc;
 614
 615                 sparse.blksz = info.blksz;
 616                 sparse.start = info.start;
 617                 sparse.size = info.size;
 618                 sparse.write = fb_mmc_sparse_write;
 619                 sparse.reserve = fb_mmc_sparse_reserve;
 620                 sparse.mssg = fastboot_fail;
 621
 622                 printf("Flashing sparse image at offset " LBAFU "\n",
 623                        sparse.start);
 624
 625                 sparse.priv = &sparse_priv;
 626                 err = write_sparse_image(&sparse, cmd, download_buffer,
 627                                          response);
 628                 if (!err)
 629                         fastboot_okay(NULL, response);
 630         } else {
 631                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 632                                 download_bytes, response);
 633         }
 634 }
 635
 636 /**
 637  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 638  *
 639  * @cmd: Named partition to erase
 640  * @response: Pointer to fastboot response buffer
 641  */
 642 void fastboot_mmc_erase(const char *cmd, char *response)
 643 {
 644         struct blk_desc *dev_desc;
 645         struct disk_partition info;
 646         lbaint_t blks, blks_start, blks_size, grp_size;
 647         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 648
 649 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 650         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 651                 /* erase EMMC boot1 */
 652                 dev_desc = fastboot_mmc_get_dev(response);
 653                 if (dev_desc)
 654                         fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
 655                 return;
 656         }
 657         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 658                 /* erase EMMC boot2 */
 659                 dev_desc = fastboot_mmc_get_dev(response);
 660                 if (dev_desc)
 661                         fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
 662                 return;
 663         }
 664 #endif
 665
 666 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 667         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 668                 /* erase EMMC userdata */
 669                 dev_desc = fastboot_mmc_get_dev(response);
 670                 if (!dev_desc)
 671                         return;
 672
 673                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 674                         fastboot_fail("Failed to erase EMMC_USER", response);
 675                 else
 676                         fastboot_okay(NULL, response);
 677                 return;
 678         }
 679 #endif
 680
 681         if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 682                 return;
 683
 684         /* Align blocks to erase group size to avoid erasing other partitions */
 685         grp_size = mmc->erase_grp_size;
 686         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 687         if (info.size >= grp_size)
 688                 blks_size = (info.size - (blks_start - info.start)) &
 689                                 (~(grp_size - 1));
 690         else
 691                 blks_size = 0;
 692
 693         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 694                blks_start, blks_start + blks_size);
 695
 696         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 697
 698         if (blks != blks_size) {
 699                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 700                 fastboot_fail("failed erasing from device", response);
 701                 return;
 702         }
 703
 704         printf("........ erased " LBAFU " bytes from '%s'\n",
 705                blks_size * info.blksz, cmd);
 706         fastboot_okay(NULL, response);
 707 }