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 <image-sparse.h>
  14 #include <image.h>
  15 #include <log.h>
  16 #include <part.h>
  17 #include <mmc.h>
  18 #include <div64.h>
  19 #include <linux/compat.h>
  20 #include <android_image.h>
  21
  22 #define BOOT_PARTITION_NAME "boot"
  23
  24 struct fb_mmc_sparse {
  25         struct blk_desc *dev_desc;
  26 };
  27
  28 static int raw_part_get_info_by_name(struct blk_desc *dev_desc,
  29                                      const char *name,
  30                                      struct disk_partition *info)
  31 {
  32         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
  33         char env_desc_name[23 + PART_NAME_LEN + 1];
  34         char *raw_part_desc;
  35         const char *argv[2];
  36         const char **parg = argv;
  37
  38         /* check for raw partition descriptor */
  39         strcpy(env_desc_name, "fastboot_raw_partition_");
  40         strlcat(env_desc_name, name, sizeof(env_desc_name));
  41         raw_part_desc = strdup(env_get(env_desc_name));
  42         if (raw_part_desc == NULL)
  43                 return -ENODEV;
  44
  45         /*
  46          * parse partition descriptor
  47          *
  48          * <lba_start> <lba_size> [mmcpart <num>]
  49          */
  50         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
  51                 *parg = strsep(&raw_part_desc, " ");
  52                 if (*parg == NULL) {
  53                         pr_err("Invalid number of arguments.\n");
  54                         return -ENODEV;
  55                 }
  56         }
  57
  58         info->start = simple_strtoul(argv[0], NULL, 0);
  59         info->size = simple_strtoul(argv[1], NULL, 0);
  60         info->blksz = dev_desc->blksz;
  61         strlcpy((char *)info->name, name, PART_NAME_LEN);
  62
  63         if (raw_part_desc) {
  64                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) {
  65                         ulong mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
  66                         int ret = blk_dselect_hwpart(dev_desc, mmcpart);
  67
  68                         if (ret)
  69                                 return ret;
  70                 }
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int do_get_part_info(struct blk_desc **dev_desc, const char *name,
  77                             struct disk_partition *info)
  78 {
  79         int ret;
  80
  81         /* First try partition names on the default device */
  82         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
  83         if (*dev_desc) {
  84                 ret = part_get_info_by_name(*dev_desc, name, info);
  85                 if (ret >= 0)
  86                         return ret;
  87
  88                 /* Then try raw partitions */
  89                 ret = raw_part_get_info_by_name(*dev_desc, name, info);
  90                 if (ret >= 0)
  91                         return ret;
  92         }
  93
  94         /* Then try dev.hwpart:part */
  95         ret = part_get_info_by_dev_and_name_or_num("mmc", name, dev_desc,
  96                                                    info, true);
  97         return ret;
  98 }
  99
 100 static int part_get_info_by_name_or_alias(struct blk_desc **dev_desc,
 101                                           const char *name,
 102                                           struct disk_partition *info)
 103 {
 104         /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
 105         char env_alias_name[25 + PART_NAME_LEN + 1];
 106         char *aliased_part_name;
 107
 108         /* check for alias */
 109         strlcpy(env_alias_name, "fastboot_partition_alias_", sizeof(env_alias_name));
 110         strlcat(env_alias_name, name, sizeof(env_alias_name));
 111         aliased_part_name = env_get(env_alias_name);
 112         if (aliased_part_name)
 113                 name = aliased_part_name;
 114
 115         return do_get_part_info(dev_desc, name, info);
 116 }
 117
 118 /**
 119  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
 120  *
 121  * @block_dev: Pointer to block device
 122  * @start: First block to write/erase
 123  * @blkcnt: Count of blocks
 124  * @buffer: Pointer to data buffer for write or NULL for erase
 125  */
 126 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
 127                                  lbaint_t blkcnt, const void *buffer)
 128 {
 129         lbaint_t blk = start;
 130         lbaint_t blks_written;
 131         lbaint_t cur_blkcnt;
 132         lbaint_t blks = 0;
 133         int i;
 134
 135         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
 136                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
 137                 if (buffer) {
 138                         if (fastboot_progress_callback)
 139                                 fastboot_progress_callback("writing");
 140                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
 141                                                   buffer + (i * block_dev->blksz));
 142                 } else {
 143                         if (fastboot_progress_callback)
 144                                 fastboot_progress_callback("erasing");
 145                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
 146                 }
 147                 blk += blks_written;
 148                 blks += blks_written;
 149         }
 150         return blks;
 151 }
 152
 153 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 154                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 155 {
 156         struct fb_mmc_sparse *sparse = info->priv;
 157         struct blk_desc *dev_desc = sparse->dev_desc;
 158
 159         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 160 }
 161
 162 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 163                 lbaint_t blk, lbaint_t blkcnt)
 164 {
 165         return blkcnt;
 166 }
 167
 168 static void write_raw_image(struct blk_desc *dev_desc,
 169                             struct disk_partition *info, const char *part_name,
 170                             void *buffer, u32 download_bytes, char *response)
 171 {
 172         lbaint_t blkcnt;
 173         lbaint_t blks;
 174
 175         /* determine number of blocks to write */
 176         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 177         blkcnt = lldiv(blkcnt, info->blksz);
 178
 179         if (blkcnt > info->size) {
 180                 pr_err("too large for partition: '%s'\n", part_name);
 181                 fastboot_fail("too large for partition", response);
 182                 return;
 183         }
 184
 185         puts("Flashing Raw Image\n");
 186
 187         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
 188
 189         if (blks != blkcnt) {
 190                 pr_err("failed writing to device %d\n", dev_desc->devnum);
 191                 fastboot_fail("failed writing to device", response);
 192                 return;
 193         }
 194
 195         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 196                part_name);
 197         fastboot_okay(NULL, response);
 198 }
 199
 200 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
 201         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 202 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 203 {
 204         lbaint_t blks;
 205
 206         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 207
 208         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 209
 210         if (blks != dev_desc->lba) {
 211                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 212                 return 1;
 213         }
 214
 215         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 216                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 217
 218         return 0;
 219 }
 220 #endif
 221
 222 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 223 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
 224                             int hwpart, u32 buff_sz, char *response)
 225 {
 226         lbaint_t blkcnt;
 227         lbaint_t blks;
 228         unsigned long blksz;
 229
 230         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
 231         if (blk_dselect_hwpart(dev_desc, hwpart)) {
 232                 pr_err("Failed to select hwpart\n");
 233                 fastboot_fail("Failed to select hwpart", response);
 234                 return;
 235         }
 236
 237         if (buffer) { /* flash */
 238
 239                 /* determine number of blocks to write */
 240                 blksz = dev_desc->blksz;
 241                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 242                 blkcnt = lldiv(blkcnt, blksz);
 243
 244                 if (blkcnt > dev_desc->lba) {
 245                         pr_err("Image size too large\n");
 246                         fastboot_fail("Image size too large", response);
 247                         return;
 248                 }
 249
 250                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
 251
 252                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 253
 254                 if (blks != blkcnt) {
 255                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
 256                         fastboot_fail("Failed to write EMMC_BOOT part",
 257                                       response);
 258                         return;
 259                 }
 260
 261                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
 262                        blkcnt * blksz, hwpart);
 263         } else { /* erase */
 264                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 265                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
 266                         fastboot_fail("Failed to erase EMMC_BOOT part",
 267                                       response);
 268                         return;
 269                 }
 270         }
 271
 272         fastboot_okay(NULL, response);
 273 }
 274 #endif
 275
 276 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 277 /**
 278  * Read Android boot image header from boot partition.
 279  *
 280  * @param[in] dev_desc MMC device descriptor
 281  * @param[in] info Boot partition info
 282  * @param[out] hdr Where to store read boot image header
 283  *
 284  * Return: Boot image header sectors count or 0 on error
 285  */
 286 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 287                                        struct disk_partition *info,
 288                                        struct andr_boot_img_hdr_v0 *hdr,
 289                                        char *response)
 290 {
 291         ulong sector_size;              /* boot partition sector size */
 292         lbaint_t hdr_sectors;           /* boot image header sectors count */
 293         int res;
 294
 295         /* Calculate boot image sectors count */
 296         sector_size = info->blksz;
 297         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_boot_img_hdr_v0), sector_size);
 298         if (hdr_sectors == 0) {
 299                 pr_err("invalid number of boot sectors: 0\n");
 300                 fastboot_fail("invalid number of boot sectors: 0", response);
 301                 return 0;
 302         }
 303
 304         /* Read the boot image header */
 305         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 306         if (res != hdr_sectors) {
 307                 pr_err("cannot read header from boot partition\n");
 308                 fastboot_fail("cannot read header from boot partition",
 309                               response);
 310                 return 0;
 311         }
 312
 313         /* Check boot header magic string */
 314         if (!is_android_boot_image_header(hdr)) {
 315                 pr_err("bad boot image magic\n");
 316                 fastboot_fail("boot partition not initialized", response);
 317                 return 0;
 318         }
 319
 320         return hdr_sectors;
 321 }
 322
 323 /**
 324  * Write downloaded zImage to boot partition and repack it properly.
 325  *
 326  * @param dev_desc MMC device descriptor
 327  * @param download_buffer Address to fastboot buffer with zImage in it
 328  * @param download_bytes Size of fastboot buffer, in bytes
 329  *
 330  * Return: 0 on success or -1 on error
 331  */
 332 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 333                                 void *download_buffer,
 334                                 u32 download_bytes,
 335                                 char *response)
 336 {
 337         uintptr_t hdr_addr;                     /* boot image header address */
 338         struct andr_boot_img_hdr_v0 *hdr;               /* boot image header */
 339         lbaint_t hdr_sectors;                   /* boot image header sectors */
 340         u8 *ramdisk_buffer;
 341         u32 ramdisk_sector_start;
 342         u32 ramdisk_sectors;
 343         u32 kernel_sector_start;
 344         u32 kernel_sectors;
 345         u32 sectors_per_page;
 346         struct disk_partition info;
 347         int res;
 348
 349         puts("Flashing zImage\n");
 350
 351         /* Get boot partition info */
 352         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 353         if (res < 0) {
 354                 pr_err("cannot find boot partition\n");
 355                 fastboot_fail("cannot find boot partition", response);
 356                 return -1;
 357         }
 358
 359         /* Put boot image header in fastboot buffer after downloaded zImage */
 360         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 361         hdr = (struct andr_boot_img_hdr_v0 *)hdr_addr;
 362
 363         /* Read boot image header */
 364         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 365         if (hdr_sectors == 0) {
 366                 pr_err("unable to read boot image header\n");
 367                 fastboot_fail("unable to read boot image header", response);
 368                 return -1;
 369         }
 370
 371         /* Check if boot image header version is 2 or less */
 372         if (hdr->header_version > 2) {
 373                 pr_err("zImage flashing supported only for boot images v2 and less\n");
 374                 fastboot_fail("zImage flashing supported only for boot images v2 and less",
 375                               response);
 376                 return -EOPNOTSUPP;
 377         }
 378
 379         /* Check if boot image has second stage in it (we don't support it) */
 380         if (hdr->second_size > 0) {
 381                 pr_err("moving second stage is not supported yet\n");
 382                 fastboot_fail("moving second stage is not supported yet",
 383                               response);
 384                 return -1;
 385         }
 386
 387         /* Extract ramdisk location */
 388         sectors_per_page = hdr->page_size / info.blksz;
 389         ramdisk_sector_start = info.start + sectors_per_page;
 390         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 391                                              sectors_per_page;
 392         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 393                                        sectors_per_page;
 394
 395         /* Read ramdisk and put it in fastboot buffer after boot image header */
 396         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 397         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 398                         ramdisk_buffer);
 399         if (res != ramdisk_sectors) {
 400                 pr_err("cannot read ramdisk from boot partition\n");
 401                 fastboot_fail("cannot read ramdisk from boot partition",
 402                               response);
 403                 return -1;
 404         }
 405
 406         /* Write new kernel size to boot image header */
 407         hdr->kernel_size = download_bytes;
 408         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 409         if (res == 0) {
 410                 pr_err("cannot writeback boot image header\n");
 411                 fastboot_fail("cannot write back boot image header", response);
 412                 return -1;
 413         }
 414
 415         /* Write the new downloaded kernel */
 416         kernel_sector_start = info.start + sectors_per_page;
 417         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 418                                       sectors_per_page;
 419         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 420                          download_buffer);
 421         if (res == 0) {
 422                 pr_err("cannot write new kernel\n");
 423                 fastboot_fail("cannot write new kernel", response);
 424                 return -1;
 425         }
 426
 427         /* Write the saved ramdisk back */
 428         ramdisk_sector_start = info.start + sectors_per_page;
 429         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 430                                              sectors_per_page;
 431         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 432                          ramdisk_buffer);
 433         if (res == 0) {
 434                 pr_err("cannot write back original ramdisk\n");
 435                 fastboot_fail("cannot write back original ramdisk", response);
 436                 return -1;
 437         }
 438
 439         puts("........ zImage was updated in boot partition\n");
 440         fastboot_okay(NULL, response);
 441         return 0;
 442 }
 443 #endif
 444
 445 /**
 446  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 447  *
 448  * @part_name: Named partition to lookup
 449  * @dev_desc: Pointer to returned blk_desc pointer
 450  * @part_info: Pointer to returned struct disk_partition
 451  * @response: Pointer to fastboot response buffer
 452  */
 453 int fastboot_mmc_get_part_info(const char *part_name,
 454                                struct blk_desc **dev_desc,
 455                                struct disk_partition *part_info, char *response)
 456 {
 457         int ret;
 458
 459         if (!part_name || !strcmp(part_name, "")) {
 460                 fastboot_fail("partition not given", response);
 461                 return -ENOENT;
 462         }
 463
 464         ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
 465         if (ret < 0) {
 466                 switch (ret) {
 467                 case -ENOSYS:
 468                 case -EINVAL:
 469                         fastboot_fail("invalid partition or device", response);
 470                         break;
 471                 case -ENODEV:
 472                         fastboot_fail("no such device", response);
 473                         break;
 474                 case -ENOENT:
 475                         fastboot_fail("no such partition", response);
 476                         break;
 477                 case -EPROTONOSUPPORT:
 478                         fastboot_fail("unknown partition table type", response);
 479                         break;
 480                 default:
 481                         fastboot_fail("unanticipated error", response);
 482                         break;
 483                 }
 484         }
 485
 486         return ret;
 487 }
 488
 489 static struct blk_desc *fastboot_mmc_get_dev(char *response)
 490 {
 491         struct blk_desc *ret = blk_get_dev("mmc",
 492                                            CONFIG_FASTBOOT_FLASH_MMC_DEV);
 493
 494         if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
 495                 pr_err("invalid mmc device\n");
 496                 fastboot_fail("invalid mmc device", response);
 497                 return NULL;
 498         }
 499         return ret;
 500 }
 501
 502 /**
 503  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 504  *
 505  * @cmd: Named partition to write image to
 506  * @download_buffer: Pointer to image data
 507  * @download_bytes: Size of image data
 508  * @response: Pointer to fastboot response buffer
 509  */
 510 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 511                               u32 download_bytes, char *response)
 512 {
 513         struct blk_desc *dev_desc;
 514         struct disk_partition info = {0};
 515
 516 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 517         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 518                 dev_desc = fastboot_mmc_get_dev(response);
 519                 if (dev_desc)
 520                         fb_mmc_boot_ops(dev_desc, download_buffer, 1,
 521                                         download_bytes, response);
 522                 return;
 523         }
 524         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 525                 dev_desc = fastboot_mmc_get_dev(response);
 526                 if (dev_desc)
 527                         fb_mmc_boot_ops(dev_desc, download_buffer, 2,
 528                                         download_bytes, response);
 529                 return;
 530         }
 531 #endif
 532
 533 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 534         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 535                 dev_desc = fastboot_mmc_get_dev(response);
 536                 if (!dev_desc)
 537                         return;
 538
 539                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 540                        __func__);
 541                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 542                         printf("%s: invalid GPT - refusing to write to flash\n",
 543                                __func__);
 544                         fastboot_fail("invalid GPT partition", response);
 545                         return;
 546                 }
 547                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 548                         printf("%s: writing GPT partitions failed\n", __func__);
 549                         fastboot_fail("writing GPT partitions failed",
 550                                       response);
 551                         return;
 552                 }
 553                 part_init(dev_desc);
 554                 printf("........ success\n");
 555                 fastboot_okay(NULL, response);
 556                 return;
 557         }
 558 #endif
 559
 560 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 561         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 562                 dev_desc = fastboot_mmc_get_dev(response);
 563                 if (!dev_desc)
 564                         return;
 565
 566                 printf("%s: updating MBR\n", __func__);
 567                 if (is_valid_dos_buf(download_buffer)) {
 568                         printf("%s: invalid MBR - refusing to write to flash\n",
 569                                __func__);
 570                         fastboot_fail("invalid MBR partition", response);
 571                         return;
 572                 }
 573                 if (write_mbr_sector(dev_desc, download_buffer)) {
 574                         printf("%s: writing MBR partition failed\n", __func__);
 575                         fastboot_fail("writing MBR partition failed",
 576                                       response);
 577                         return;
 578                 }
 579                 part_init(dev_desc);
 580                 printf("........ success\n");
 581                 fastboot_okay(NULL, response);
 582                 return;
 583         }
 584 #endif
 585
 586 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 587         if (strncasecmp(cmd, "zimage", 6) == 0) {
 588                 dev_desc = fastboot_mmc_get_dev(response);
 589                 if (dev_desc)
 590                         fb_mmc_update_zimage(dev_desc, download_buffer,
 591                                              download_bytes, response);
 592                 return;
 593         }
 594 #endif
 595
 596 #if IS_ENABLED(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 597         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 598                 dev_desc = fastboot_mmc_get_dev(response);
 599                 if (!dev_desc)
 600                         return;
 601
 602                 strlcpy((char *)&info.name, cmd, sizeof(info.name));
 603                 info.size       = dev_desc->lba;
 604                 info.blksz      = dev_desc->blksz;
 605         }
 606 #endif
 607
 608         if (!info.name[0] &&
 609             fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 610                 return;
 611
 612         if (is_sparse_image(download_buffer)) {
 613                 struct fb_mmc_sparse sparse_priv;
 614                 struct sparse_storage sparse;
 615                 int err;
 616
 617                 sparse_priv.dev_desc = dev_desc;
 618
 619                 sparse.blksz = info.blksz;
 620                 sparse.start = info.start;
 621                 sparse.size = info.size;
 622                 sparse.write = fb_mmc_sparse_write;
 623                 sparse.reserve = fb_mmc_sparse_reserve;
 624                 sparse.mssg = fastboot_fail;
 625
 626                 printf("Flashing sparse image at offset " LBAFU "\n",
 627                        sparse.start);
 628
 629                 sparse.priv = &sparse_priv;
 630                 err = write_sparse_image(&sparse, cmd, download_buffer,
 631                                          response);
 632                 if (!err)
 633                         fastboot_okay(NULL, response);
 634         } else {
 635                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 636                                 download_bytes, response);
 637         }
 638 }
 639
 640 /**
 641  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 642  *
 643  * @cmd: Named partition to erase
 644  * @response: Pointer to fastboot response buffer
 645  */
 646 void fastboot_mmc_erase(const char *cmd, char *response)
 647 {
 648         struct blk_desc *dev_desc;
 649         struct disk_partition info;
 650         lbaint_t blks, blks_start, blks_size, grp_size;
 651         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 652
 653 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 654         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 655                 /* erase EMMC boot1 */
 656                 dev_desc = fastboot_mmc_get_dev(response);
 657                 if (dev_desc)
 658                         fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
 659                 return;
 660         }
 661         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 662                 /* erase EMMC boot2 */
 663                 dev_desc = fastboot_mmc_get_dev(response);
 664                 if (dev_desc)
 665                         fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
 666                 return;
 667         }
 668 #endif
 669
 670 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 671         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 672                 /* erase EMMC userdata */
 673                 dev_desc = fastboot_mmc_get_dev(response);
 674                 if (!dev_desc)
 675                         return;
 676
 677                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 678                         fastboot_fail("Failed to erase EMMC_USER", response);
 679                 else
 680                         fastboot_okay(NULL, response);
 681                 return;
 682         }
 683 #endif
 684
 685         if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 686                 return;
 687
 688         /* Align blocks to erase group size to avoid erasing other partitions */
 689         grp_size = mmc->erase_grp_size;
 690         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 691         if (info.size >= grp_size)
 692                 blks_size = (info.size - (blks_start - info.start)) &
 693                                 (~(grp_size - 1));
 694         else
 695                 blks_size = 0;
 696
 697         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 698                blks_start, blks_start + blks_size);
 699
 700         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 701
 702         if (blks != blks_size) {
 703                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 704                 fastboot_fail("failed erasing from device", response);
 705                 return;
 706         }
 707
 708         printf("........ erased " LBAFU " bytes from '%s'\n",
 709                blks_size * info.blksz, cmd);
 710         fastboot_okay(NULL, response);
 711 }