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 FASTBOOT_MAX_BLK_WRITE 16384
  23
  24 #define BOOT_PARTITION_NAME "boot"
  25
  26 struct fb_mmc_sparse {
  27         struct blk_desc *dev_desc;
  28 };
  29
  30 static int raw_part_get_info_by_name(struct blk_desc *dev_desc,
  31                                      const char *name,
  32                                      struct disk_partition *info)
  33 {
  34         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
  35         char env_desc_name[23 + PART_NAME_LEN + 1];
  36         char *raw_part_desc;
  37         const char *argv[2];
  38         const char **parg = argv;
  39
  40         /* check for raw partition descriptor */
  41         strcpy(env_desc_name, "fastboot_raw_partition_");
  42         strlcat(env_desc_name, name, sizeof(env_desc_name));
  43         raw_part_desc = strdup(env_get(env_desc_name));
  44         if (raw_part_desc == NULL)
  45                 return -ENODEV;
  46
  47         /*
  48          * parse partition descriptor
  49          *
  50          * <lba_start> <lba_size> [mmcpart <num>]
  51          */
  52         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
  53                 *parg = strsep(&raw_part_desc, " ");
  54                 if (*parg == NULL) {
  55                         pr_err("Invalid number of arguments.\n");
  56                         return -ENODEV;
  57                 }
  58         }
  59
  60         info->start = simple_strtoul(argv[0], NULL, 0);
  61         info->size = simple_strtoul(argv[1], NULL, 0);
  62         info->blksz = dev_desc->blksz;
  63         strlcpy((char *)info->name, name, PART_NAME_LEN);
  64
  65         if (raw_part_desc) {
  66                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) {
  67                         ulong mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
  68                         int ret = blk_dselect_hwpart(dev_desc, mmcpart);
  69
  70                         if (ret)
  71                                 return ret;
  72                 }
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int do_get_part_info(struct blk_desc **dev_desc, const char *name,
  79                             struct disk_partition *info)
  80 {
  81         int ret;
  82
  83         /* First try partition names on the default device */
  84         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
  85         if (*dev_desc) {
  86                 ret = part_get_info_by_name(*dev_desc, name, info);
  87                 if (ret >= 0)
  88                         return ret;
  89
  90                 /* Then try raw partitions */
  91                 ret = raw_part_get_info_by_name(*dev_desc, name, info);
  92                 if (ret >= 0)
  93                         return ret;
  94         }
  95
  96         /* Then try dev.hwpart:part */
  97         ret = part_get_info_by_dev_and_name_or_num("mmc", name, dev_desc,
  98                                                    info, true);
  99         return ret;
 100 }
 101
 102 static int part_get_info_by_name_or_alias(struct blk_desc **dev_desc,
 103                                           const char *name,
 104                                           struct disk_partition *info)
 105 {
 106         /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
 107         char env_alias_name[25 + PART_NAME_LEN + 1];
 108         char *aliased_part_name;
 109
 110         /* check for alias */
 111         strlcpy(env_alias_name, "fastboot_partition_alias_", sizeof(env_alias_name));
 112         strlcat(env_alias_name, name, sizeof(env_alias_name));
 113         aliased_part_name = env_get(env_alias_name);
 114         if (aliased_part_name)
 115                 name = aliased_part_name;
 116
 117         return do_get_part_info(dev_desc, name, info);
 118 }
 119
 120 /**
 121  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
 122  *
 123  * @block_dev: Pointer to block device
 124  * @start: First block to write/erase
 125  * @blkcnt: Count of blocks
 126  * @buffer: Pointer to data buffer for write or NULL for erase
 127  */
 128 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
 129                                  lbaint_t blkcnt, const void *buffer)
 130 {
 131         lbaint_t blk = start;
 132         lbaint_t blks_written;
 133         lbaint_t cur_blkcnt;
 134         lbaint_t blks = 0;
 135         int i;
 136
 137         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
 138                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
 139                 if (buffer) {
 140                         if (fastboot_progress_callback)
 141                                 fastboot_progress_callback("writing");
 142                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
 143                                                   buffer + (i * block_dev->blksz));
 144                 } else {
 145                         if (fastboot_progress_callback)
 146                                 fastboot_progress_callback("erasing");
 147                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
 148                 }
 149                 blk += blks_written;
 150                 blks += blks_written;
 151         }
 152         return blks;
 153 }
 154
 155 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 156                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 157 {
 158         struct fb_mmc_sparse *sparse = info->priv;
 159         struct blk_desc *dev_desc = sparse->dev_desc;
 160
 161         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 162 }
 163
 164 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 165                 lbaint_t blk, lbaint_t blkcnt)
 166 {
 167         return blkcnt;
 168 }
 169
 170 static void write_raw_image(struct blk_desc *dev_desc,
 171                             struct disk_partition *info, const char *part_name,
 172                             void *buffer, u32 download_bytes, char *response)
 173 {
 174         lbaint_t blkcnt;
 175         lbaint_t blks;
 176
 177         /* determine number of blocks to write */
 178         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 179         blkcnt = lldiv(blkcnt, info->blksz);
 180
 181         if (blkcnt > info->size) {
 182                 pr_err("too large for partition: '%s'\n", part_name);
 183                 fastboot_fail("too large for partition", response);
 184                 return;
 185         }
 186
 187         puts("Flashing Raw Image\n");
 188
 189         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
 190
 191         if (blks != blkcnt) {
 192                 pr_err("failed writing to device %d\n", dev_desc->devnum);
 193                 fastboot_fail("failed writing to device", response);
 194                 return;
 195         }
 196
 197         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 198                part_name);
 199         fastboot_okay(NULL, response);
 200 }
 201
 202 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
 203         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 204 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 205 {
 206         lbaint_t blks;
 207
 208         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 209
 210         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 211
 212         if (blks != dev_desc->lba) {
 213                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 214                 return 1;
 215         }
 216
 217         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 218                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 219
 220         return 0;
 221 }
 222 #endif
 223
 224 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 225 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
 226                             int hwpart, u32 buff_sz, char *response)
 227 {
 228         lbaint_t blkcnt;
 229         lbaint_t blks;
 230         unsigned long blksz;
 231
 232         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
 233         if (blk_dselect_hwpart(dev_desc, hwpart)) {
 234                 pr_err("Failed to select hwpart\n");
 235                 fastboot_fail("Failed to select hwpart", response);
 236                 return;
 237         }
 238
 239         if (buffer) { /* flash */
 240
 241                 /* determine number of blocks to write */
 242                 blksz = dev_desc->blksz;
 243                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 244                 blkcnt = lldiv(blkcnt, blksz);
 245
 246                 if (blkcnt > dev_desc->lba) {
 247                         pr_err("Image size too large\n");
 248                         fastboot_fail("Image size too large", response);
 249                         return;
 250                 }
 251
 252                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
 253
 254                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 255
 256                 if (blks != blkcnt) {
 257                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
 258                         fastboot_fail("Failed to write EMMC_BOOT part",
 259                                       response);
 260                         return;
 261                 }
 262
 263                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
 264                        blkcnt * blksz, hwpart);
 265         } else { /* erase */
 266                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 267                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
 268                         fastboot_fail("Failed to erase EMMC_BOOT part",
 269                                       response);
 270                         return;
 271                 }
 272         }
 273
 274         fastboot_okay(NULL, response);
 275 }
 276 #endif
 277
 278 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 279 /**
 280  * Read Android boot image header from boot partition.
 281  *
 282  * @param[in] dev_desc MMC device descriptor
 283  * @param[in] info Boot partition info
 284  * @param[out] hdr Where to store read boot image header
 285  *
 286  * Return: Boot image header sectors count or 0 on error
 287  */
 288 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 289                                        struct disk_partition *info,
 290                                        struct andr_img_hdr *hdr,
 291                                        char *response)
 292 {
 293         ulong sector_size;              /* boot partition sector size */
 294         lbaint_t hdr_sectors;           /* boot image header sectors count */
 295         int res;
 296
 297         /* Calculate boot image sectors count */
 298         sector_size = info->blksz;
 299         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 300         if (hdr_sectors == 0) {
 301                 pr_err("invalid number of boot sectors: 0\n");
 302                 fastboot_fail("invalid number of boot sectors: 0", response);
 303                 return 0;
 304         }
 305
 306         /* Read the boot image header */
 307         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 308         if (res != hdr_sectors) {
 309                 pr_err("cannot read header from boot partition\n");
 310                 fastboot_fail("cannot read header from boot partition",
 311                               response);
 312                 return 0;
 313         }
 314
 315         /* Check boot header magic string */
 316         res = android_image_check_header(hdr);
 317         if (res != 0) {
 318                 pr_err("bad boot image magic\n");
 319                 fastboot_fail("boot partition not initialized", response);
 320                 return 0;
 321         }
 322
 323         return hdr_sectors;
 324 }
 325
 326 /**
 327  * Write downloaded zImage to boot partition and repack it properly.
 328  *
 329  * @param dev_desc MMC device descriptor
 330  * @param download_buffer Address to fastboot buffer with zImage in it
 331  * @param download_bytes Size of fastboot buffer, in bytes
 332  *
 333  * Return: 0 on success or -1 on error
 334  */
 335 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 336                                 void *download_buffer,
 337                                 u32 download_bytes,
 338                                 char *response)
 339 {
 340         uintptr_t hdr_addr;                     /* boot image header address */
 341         struct andr_img_hdr *hdr;               /* boot image header */
 342         lbaint_t hdr_sectors;                   /* boot image header sectors */
 343         u8 *ramdisk_buffer;
 344         u32 ramdisk_sector_start;
 345         u32 ramdisk_sectors;
 346         u32 kernel_sector_start;
 347         u32 kernel_sectors;
 348         u32 sectors_per_page;
 349         struct disk_partition info;
 350         int res;
 351
 352         puts("Flashing zImage\n");
 353
 354         /* Get boot partition info */
 355         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 356         if (res < 0) {
 357                 pr_err("cannot find boot partition\n");
 358                 fastboot_fail("cannot find boot partition", response);
 359                 return -1;
 360         }
 361
 362         /* Put boot image header in fastboot buffer after downloaded zImage */
 363         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 364         hdr = (struct andr_img_hdr *)hdr_addr;
 365
 366         /* Read boot image header */
 367         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 368         if (hdr_sectors == 0) {
 369                 pr_err("unable to read boot image header\n");
 370                 fastboot_fail("unable to read boot image header", response);
 371                 return -1;
 372         }
 373
 374         /* Check if boot image has second stage in it (we don't support it) */
 375         if (hdr->second_size > 0) {
 376                 pr_err("moving second stage is not supported yet\n");
 377                 fastboot_fail("moving second stage is not supported yet",
 378                               response);
 379                 return -1;
 380         }
 381
 382         /* Extract ramdisk location */
 383         sectors_per_page = hdr->page_size / info.blksz;
 384         ramdisk_sector_start = info.start + sectors_per_page;
 385         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 386                                              sectors_per_page;
 387         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 388                                        sectors_per_page;
 389
 390         /* Read ramdisk and put it in fastboot buffer after boot image header */
 391         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 392         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 393                         ramdisk_buffer);
 394         if (res != ramdisk_sectors) {
 395                 pr_err("cannot read ramdisk from boot partition\n");
 396                 fastboot_fail("cannot read ramdisk from boot partition",
 397                               response);
 398                 return -1;
 399         }
 400
 401         /* Write new kernel size to boot image header */
 402         hdr->kernel_size = download_bytes;
 403         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 404         if (res == 0) {
 405                 pr_err("cannot writeback boot image header\n");
 406                 fastboot_fail("cannot write back boot image header", response);
 407                 return -1;
 408         }
 409
 410         /* Write the new downloaded kernel */
 411         kernel_sector_start = info.start + sectors_per_page;
 412         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 413                                       sectors_per_page;
 414         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 415                          download_buffer);
 416         if (res == 0) {
 417                 pr_err("cannot write new kernel\n");
 418                 fastboot_fail("cannot write new kernel", response);
 419                 return -1;
 420         }
 421
 422         /* Write the saved ramdisk back */
 423         ramdisk_sector_start = info.start + sectors_per_page;
 424         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 425                                              sectors_per_page;
 426         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 427                          ramdisk_buffer);
 428         if (res == 0) {
 429                 pr_err("cannot write back original ramdisk\n");
 430                 fastboot_fail("cannot write back original ramdisk", response);
 431                 return -1;
 432         }
 433
 434         puts("........ zImage was updated in boot partition\n");
 435         fastboot_okay(NULL, response);
 436         return 0;
 437 }
 438 #endif
 439
 440 /**
 441  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 442  *
 443  * @part_name: Named partition to lookup
 444  * @dev_desc: Pointer to returned blk_desc pointer
 445  * @part_info: Pointer to returned struct disk_partition
 446  * @response: Pointer to fastboot response buffer
 447  */
 448 int fastboot_mmc_get_part_info(const char *part_name,
 449                                struct blk_desc **dev_desc,
 450                                struct disk_partition *part_info, char *response)
 451 {
 452         int ret;
 453
 454         if (!part_name || !strcmp(part_name, "")) {
 455                 fastboot_fail("partition not given", response);
 456                 return -ENOENT;
 457         }
 458
 459         ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
 460         if (ret < 0) {
 461                 switch (ret) {
 462                 case -ENOSYS:
 463                 case -EINVAL:
 464                         fastboot_fail("invalid partition or device", response);
 465                         break;
 466                 case -ENODEV:
 467                         fastboot_fail("no such device", response);
 468                         break;
 469                 case -ENOENT:
 470                         fastboot_fail("no such partition", response);
 471                         break;
 472                 case -EPROTONOSUPPORT:
 473                         fastboot_fail("unknown partition table type", response);
 474                         break;
 475                 default:
 476                         fastboot_fail("unanticipated error", response);
 477                         break;
 478                 }
 479         }
 480
 481         return ret;
 482 }
 483
 484 static struct blk_desc *fastboot_mmc_get_dev(char *response)
 485 {
 486         struct blk_desc *ret = blk_get_dev("mmc",
 487                                            CONFIG_FASTBOOT_FLASH_MMC_DEV);
 488
 489         if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
 490                 pr_err("invalid mmc device\n");
 491                 fastboot_fail("invalid mmc device", response);
 492                 return NULL;
 493         }
 494         return ret;
 495 }
 496
 497 /**
 498  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 499  *
 500  * @cmd: Named partition to write image to
 501  * @download_buffer: Pointer to image data
 502  * @download_bytes: Size of image data
 503  * @response: Pointer to fastboot response buffer
 504  */
 505 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 506                               u32 download_bytes, char *response)
 507 {
 508         struct blk_desc *dev_desc;
 509         struct disk_partition info = {0};
 510
 511 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 512         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 513                 dev_desc = fastboot_mmc_get_dev(response);
 514                 if (dev_desc)
 515                         fb_mmc_boot_ops(dev_desc, download_buffer, 1,
 516                                         download_bytes, response);
 517                 return;
 518         }
 519         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 520                 dev_desc = fastboot_mmc_get_dev(response);
 521                 if (dev_desc)
 522                         fb_mmc_boot_ops(dev_desc, download_buffer, 2,
 523                                         download_bytes, response);
 524                 return;
 525         }
 526 #endif
 527
 528 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 529         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 530                 dev_desc = fastboot_mmc_get_dev(response);
 531                 if (!dev_desc)
 532                         return;
 533
 534                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 535                        __func__);
 536                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 537                         printf("%s: invalid GPT - refusing to write to flash\n",
 538                                __func__);
 539                         fastboot_fail("invalid GPT partition", response);
 540                         return;
 541                 }
 542                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 543                         printf("%s: writing GPT partitions failed\n", __func__);
 544                         fastboot_fail("writing GPT partitions failed",
 545                                       response);
 546                         return;
 547                 }
 548                 part_init(dev_desc);
 549                 printf("........ success\n");
 550                 fastboot_okay(NULL, response);
 551                 return;
 552         }
 553 #endif
 554
 555 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 556         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 557                 dev_desc = fastboot_mmc_get_dev(response);
 558                 if (!dev_desc)
 559                         return;
 560
 561                 printf("%s: updating MBR\n", __func__);
 562                 if (is_valid_dos_buf(download_buffer)) {
 563                         printf("%s: invalid MBR - refusing to write to flash\n",
 564                                __func__);
 565                         fastboot_fail("invalid MBR partition", response);
 566                         return;
 567                 }
 568                 if (write_mbr_sector(dev_desc, download_buffer)) {
 569                         printf("%s: writing MBR partition failed\n", __func__);
 570                         fastboot_fail("writing MBR partition failed",
 571                                       response);
 572                         return;
 573                 }
 574                 part_init(dev_desc);
 575                 printf("........ success\n");
 576                 fastboot_okay(NULL, response);
 577                 return;
 578         }
 579 #endif
 580
 581 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 582         if (strncasecmp(cmd, "zimage", 6) == 0) {
 583                 dev_desc = fastboot_mmc_get_dev(response);
 584                 if (dev_desc)
 585                         fb_mmc_update_zimage(dev_desc, download_buffer,
 586                                              download_bytes, response);
 587                 return;
 588         }
 589 #endif
 590
 591 #if CONFIG_IS_ENABLED(FASTBOOT_MMC_USER_SUPPORT)
 592         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 593                 dev_desc = fastboot_mmc_get_dev(response);
 594                 if (!dev_desc)
 595                         return;
 596
 597                 strlcpy((char *)&info.name, cmd, sizeof(info.name));
 598                 info.size       = dev_desc->lba;
 599                 info.blksz      = dev_desc->blksz;
 600         }
 601 #endif
 602
 603         if (!info.name[0] &&
 604             fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 605                 return;
 606
 607         if (is_sparse_image(download_buffer)) {
 608                 struct fb_mmc_sparse sparse_priv;
 609                 struct sparse_storage sparse;
 610                 int err;
 611
 612                 sparse_priv.dev_desc = dev_desc;
 613
 614                 sparse.blksz = info.blksz;
 615                 sparse.start = info.start;
 616                 sparse.size = info.size;
 617                 sparse.write = fb_mmc_sparse_write;
 618                 sparse.reserve = fb_mmc_sparse_reserve;
 619                 sparse.mssg = fastboot_fail;
 620
 621                 printf("Flashing sparse image at offset " LBAFU "\n",
 622                        sparse.start);
 623
 624                 sparse.priv = &sparse_priv;
 625                 err = write_sparse_image(&sparse, cmd, download_buffer,
 626                                          response);
 627                 if (!err)
 628                         fastboot_okay(NULL, response);
 629         } else {
 630                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 631                                 download_bytes, response);
 632         }
 633 }
 634
 635 /**
 636  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 637  *
 638  * @cmd: Named partition to erase
 639  * @response: Pointer to fastboot response buffer
 640  */
 641 void fastboot_mmc_erase(const char *cmd, char *response)
 642 {
 643         struct blk_desc *dev_desc;
 644         struct disk_partition info;
 645         lbaint_t blks, blks_start, blks_size, grp_size;
 646         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 647
 648 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 649         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 650                 /* erase EMMC boot1 */
 651                 dev_desc = fastboot_mmc_get_dev(response);
 652                 if (dev_desc)
 653                         fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
 654                 return;
 655         }
 656         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 657                 /* erase EMMC boot2 */
 658                 dev_desc = fastboot_mmc_get_dev(response);
 659                 if (dev_desc)
 660                         fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
 661                 return;
 662         }
 663 #endif
 664
 665 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 666         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 667                 /* erase EMMC userdata */
 668                 dev_desc = fastboot_mmc_get_dev(response);
 669                 if (!dev_desc)
 670                         return;
 671
 672                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 673                         fastboot_fail("Failed to erase EMMC_USER", response);
 674                 else
 675                         fastboot_okay(NULL, response);
 676                 return;
 677         }
 678 #endif
 679
 680         if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 681                 return;
 682
 683         /* Align blocks to erase group size to avoid erasing other partitions */
 684         grp_size = mmc->erase_grp_size;
 685         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 686         if (info.size >= grp_size)
 687                 blks_size = (info.size - (blks_start - info.start)) &
 688                                 (~(grp_size - 1));
 689         else
 690                 blks_size = 0;
 691
 692         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 693                blks_start, blks_start + blks_size);
 694
 695         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 696
 697         if (blks != blks_size) {
 698                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 699                 fastboot_fail("failed erasing from device", response);
 700                 return;
 701         }
 702
 703         printf("........ erased " LBAFU " bytes from '%s'\n",
 704                blks_size * info.blksz, cmd);
 705         fastboot_okay(NULL, response);
 706 }