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         int ret;
 108
 109         ret = do_get_part_info(dev_desc, name, info);
 110         if (ret < 0) {
 111                 /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
 112                 char env_alias_name[25 + PART_NAME_LEN + 1];
 113                 char *aliased_part_name;
 114
 115                 /* check for alias */
 116                 strcpy(env_alias_name, "fastboot_partition_alias_");
 117                 strlcat(env_alias_name, name, sizeof(env_alias_name));
 118                 aliased_part_name = env_get(env_alias_name);
 119                 if (aliased_part_name != NULL)
 120                         ret = do_get_part_info(dev_desc, aliased_part_name,
 121                                                info);
 122         }
 123         return ret;
 124 }
 125
 126 /**
 127  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
 128  *
 129  * @block_dev: Pointer to block device
 130  * @start: First block to write/erase
 131  * @blkcnt: Count of blocks
 132  * @buffer: Pointer to data buffer for write or NULL for erase
 133  */
 134 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
 135                                  lbaint_t blkcnt, const void *buffer)
 136 {
 137         lbaint_t blk = start;
 138         lbaint_t blks_written;
 139         lbaint_t cur_blkcnt;
 140         lbaint_t blks = 0;
 141         int i;
 142
 143         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
 144                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
 145                 if (buffer) {
 146                         if (fastboot_progress_callback)
 147                                 fastboot_progress_callback("writing");
 148                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
 149                                                   buffer + (i * block_dev->blksz));
 150                 } else {
 151                         if (fastboot_progress_callback)
 152                                 fastboot_progress_callback("erasing");
 153                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
 154                 }
 155                 blk += blks_written;
 156                 blks += blks_written;
 157         }
 158         return blks;
 159 }
 160
 161 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
 162                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
 163 {
 164         struct fb_mmc_sparse *sparse = info->priv;
 165         struct blk_desc *dev_desc = sparse->dev_desc;
 166
 167         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
 168 }
 169
 170 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
 171                 lbaint_t blk, lbaint_t blkcnt)
 172 {
 173         return blkcnt;
 174 }
 175
 176 static void write_raw_image(struct blk_desc *dev_desc,
 177                             struct disk_partition *info, const char *part_name,
 178                             void *buffer, u32 download_bytes, char *response)
 179 {
 180         lbaint_t blkcnt;
 181         lbaint_t blks;
 182
 183         /* determine number of blocks to write */
 184         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
 185         blkcnt = lldiv(blkcnt, info->blksz);
 186
 187         if (blkcnt > info->size) {
 188                 pr_err("too large for partition: '%s'\n", part_name);
 189                 fastboot_fail("too large for partition", response);
 190                 return;
 191         }
 192
 193         puts("Flashing Raw Image\n");
 194
 195         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
 196
 197         if (blks != blkcnt) {
 198                 pr_err("failed writing to device %d\n", dev_desc->devnum);
 199                 fastboot_fail("failed writing to device", response);
 200                 return;
 201         }
 202
 203         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 204                part_name);
 205         fastboot_okay(NULL, response);
 206 }
 207
 208 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
 209         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
 210 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
 211 {
 212         lbaint_t blks;
 213
 214         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
 215
 216         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
 217
 218         if (blks != dev_desc->lba) {
 219                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
 220                 return 1;
 221         }
 222
 223         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
 224                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
 225
 226         return 0;
 227 }
 228 #endif
 229
 230 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 231 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
 232                             int hwpart, u32 buff_sz, char *response)
 233 {
 234         lbaint_t blkcnt;
 235         lbaint_t blks;
 236         unsigned long blksz;
 237
 238         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
 239         if (blk_dselect_hwpart(dev_desc, hwpart)) {
 240                 pr_err("Failed to select hwpart\n");
 241                 fastboot_fail("Failed to select hwpart", response);
 242                 return;
 243         }
 244
 245         if (buffer) { /* flash */
 246
 247                 /* determine number of blocks to write */
 248                 blksz = dev_desc->blksz;
 249                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
 250                 blkcnt = lldiv(blkcnt, blksz);
 251
 252                 if (blkcnt > dev_desc->lba) {
 253                         pr_err("Image size too large\n");
 254                         fastboot_fail("Image size too large", response);
 255                         return;
 256                 }
 257
 258                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
 259
 260                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
 261
 262                 if (blks != blkcnt) {
 263                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
 264                         fastboot_fail("Failed to write EMMC_BOOT part",
 265                                       response);
 266                         return;
 267                 }
 268
 269                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
 270                        blkcnt * blksz, hwpart);
 271         } else { /* erase */
 272                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
 273                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
 274                         fastboot_fail("Failed to erase EMMC_BOOT part",
 275                                       response);
 276                         return;
 277                 }
 278         }
 279
 280         fastboot_okay(NULL, response);
 281 }
 282 #endif
 283
 284 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 285 /**
 286  * Read Android boot image header from boot partition.
 287  *
 288  * @param[in] dev_desc MMC device descriptor
 289  * @param[in] info Boot partition info
 290  * @param[out] hdr Where to store read boot image header
 291  *
 292  * @return Boot image header sectors count or 0 on error
 293  */
 294 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 295                                        struct disk_partition *info,
 296                                        struct andr_img_hdr *hdr,
 297                                        char *response)
 298 {
 299         ulong sector_size;              /* boot partition sector size */
 300         lbaint_t hdr_sectors;           /* boot image header sectors count */
 301         int res;
 302
 303         /* Calculate boot image sectors count */
 304         sector_size = info->blksz;
 305         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 306         if (hdr_sectors == 0) {
 307                 pr_err("invalid number of boot sectors: 0\n");
 308                 fastboot_fail("invalid number of boot sectors: 0", response);
 309                 return 0;
 310         }
 311
 312         /* Read the boot image header */
 313         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 314         if (res != hdr_sectors) {
 315                 pr_err("cannot read header from boot partition\n");
 316                 fastboot_fail("cannot read header from boot partition",
 317                               response);
 318                 return 0;
 319         }
 320
 321         /* Check boot header magic string */
 322         res = android_image_check_header(hdr);
 323         if (res != 0) {
 324                 pr_err("bad boot image magic\n");
 325                 fastboot_fail("boot partition not initialized", response);
 326                 return 0;
 327         }
 328
 329         return hdr_sectors;
 330 }
 331
 332 /**
 333  * Write downloaded zImage to boot partition and repack it properly.
 334  *
 335  * @param dev_desc MMC device descriptor
 336  * @param download_buffer Address to fastboot buffer with zImage in it
 337  * @param download_bytes Size of fastboot buffer, in bytes
 338  *
 339  * @return 0 on success or -1 on error
 340  */
 341 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 342                                 void *download_buffer,
 343                                 u32 download_bytes,
 344                                 char *response)
 345 {
 346         uintptr_t hdr_addr;                     /* boot image header address */
 347         struct andr_img_hdr *hdr;               /* boot image header */
 348         lbaint_t hdr_sectors;                   /* boot image header sectors */
 349         u8 *ramdisk_buffer;
 350         u32 ramdisk_sector_start;
 351         u32 ramdisk_sectors;
 352         u32 kernel_sector_start;
 353         u32 kernel_sectors;
 354         u32 sectors_per_page;
 355         struct disk_partition info;
 356         int res;
 357
 358         puts("Flashing zImage\n");
 359
 360         /* Get boot partition info */
 361         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 362         if (res < 0) {
 363                 pr_err("cannot find boot partition\n");
 364                 fastboot_fail("cannot find boot partition", response);
 365                 return -1;
 366         }
 367
 368         /* Put boot image header in fastboot buffer after downloaded zImage */
 369         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 370         hdr = (struct andr_img_hdr *)hdr_addr;
 371
 372         /* Read boot image header */
 373         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 374         if (hdr_sectors == 0) {
 375                 pr_err("unable to read boot image header\n");
 376                 fastboot_fail("unable to read boot image header", response);
 377                 return -1;
 378         }
 379
 380         /* Check if boot image has second stage in it (we don't support it) */
 381         if (hdr->second_size > 0) {
 382                 pr_err("moving second stage is not supported yet\n");
 383                 fastboot_fail("moving second stage is not supported yet",
 384                               response);
 385                 return -1;
 386         }
 387
 388         /* Extract ramdisk location */
 389         sectors_per_page = hdr->page_size / info.blksz;
 390         ramdisk_sector_start = info.start + sectors_per_page;
 391         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 392                                              sectors_per_page;
 393         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 394                                        sectors_per_page;
 395
 396         /* Read ramdisk and put it in fastboot buffer after boot image header */
 397         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 398         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 399                         ramdisk_buffer);
 400         if (res != ramdisk_sectors) {
 401                 pr_err("cannot read ramdisk from boot partition\n");
 402                 fastboot_fail("cannot read ramdisk from boot partition",
 403                               response);
 404                 return -1;
 405         }
 406
 407         /* Write new kernel size to boot image header */
 408         hdr->kernel_size = download_bytes;
 409         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 410         if (res == 0) {
 411                 pr_err("cannot writeback boot image header\n");
 412                 fastboot_fail("cannot write back boot image header", response);
 413                 return -1;
 414         }
 415
 416         /* Write the new downloaded kernel */
 417         kernel_sector_start = info.start + sectors_per_page;
 418         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 419                                       sectors_per_page;
 420         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 421                          download_buffer);
 422         if (res == 0) {
 423                 pr_err("cannot write new kernel\n");
 424                 fastboot_fail("cannot write new kernel", response);
 425                 return -1;
 426         }
 427
 428         /* Write the saved ramdisk back */
 429         ramdisk_sector_start = info.start + sectors_per_page;
 430         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 431                                              sectors_per_page;
 432         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 433                          ramdisk_buffer);
 434         if (res == 0) {
 435                 pr_err("cannot write back original ramdisk\n");
 436                 fastboot_fail("cannot write back original ramdisk", response);
 437                 return -1;
 438         }
 439
 440         puts("........ zImage was updated in boot partition\n");
 441         fastboot_okay(NULL, response);
 442         return 0;
 443 }
 444 #endif
 445
 446 /**
 447  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
 448  *
 449  * @part_name: Named partition to lookup
 450  * @dev_desc: Pointer to returned blk_desc pointer
 451  * @part_info: Pointer to returned struct disk_partition
 452  * @response: Pointer to fastboot response buffer
 453  */
 454 int fastboot_mmc_get_part_info(const char *part_name,
 455                                struct blk_desc **dev_desc,
 456                                struct disk_partition *part_info, char *response)
 457 {
 458         int ret;
 459
 460         if (!part_name || !strcmp(part_name, "")) {
 461                 fastboot_fail("partition not given", response);
 462                 return -ENOENT;
 463         }
 464
 465         ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
 466         if (ret < 0) {
 467                 switch (ret) {
 468                 case -ENOSYS:
 469                 case -EINVAL:
 470                         fastboot_fail("invalid partition or device", response);
 471                         break;
 472                 case -ENODEV:
 473                         fastboot_fail("no such device", response);
 474                         break;
 475                 case -ENOENT:
 476                         fastboot_fail("no such partition", response);
 477                         break;
 478                 case -EPROTONOSUPPORT:
 479                         fastboot_fail("unknown partition table type", response);
 480                         break;
 481                 default:
 482                         fastboot_fail("unanticipated error", response);
 483                         break;
 484                 }
 485         }
 486
 487         return ret;
 488 }
 489
 490 static struct blk_desc *fastboot_mmc_get_dev(char *response)
 491 {
 492         struct blk_desc *ret = blk_get_dev("mmc",
 493                                            CONFIG_FASTBOOT_FLASH_MMC_DEV);
 494
 495         if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
 496                 pr_err("invalid mmc device\n");
 497                 fastboot_fail("invalid mmc device", response);
 498                 return NULL;
 499         }
 500         return ret;
 501 }
 502
 503 /**
 504  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
 505  *
 506  * @cmd: Named partition to write image to
 507  * @download_buffer: Pointer to image data
 508  * @download_bytes: Size of image data
 509  * @response: Pointer to fastboot response buffer
 510  */
 511 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
 512                               u32 download_bytes, char *response)
 513 {
 514         struct blk_desc *dev_desc;
 515         struct disk_partition info = {0};
 516
 517 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 518         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 519                 dev_desc = fastboot_mmc_get_dev(response);
 520                 if (dev_desc)
 521                         fb_mmc_boot_ops(dev_desc, download_buffer, 1,
 522                                         download_bytes, response);
 523                 return;
 524         }
 525         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 526                 dev_desc = fastboot_mmc_get_dev(response);
 527                 if (dev_desc)
 528                         fb_mmc_boot_ops(dev_desc, download_buffer, 2,
 529                                         download_bytes, response);
 530                 return;
 531         }
 532 #endif
 533
 534 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 535         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 536                 dev_desc = fastboot_mmc_get_dev(response);
 537                 if (!dev_desc)
 538                         return;
 539
 540                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 541                        __func__);
 542                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 543                         printf("%s: invalid GPT - refusing to write to flash\n",
 544                                __func__);
 545                         fastboot_fail("invalid GPT partition", response);
 546                         return;
 547                 }
 548                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 549                         printf("%s: writing GPT partitions failed\n", __func__);
 550                         fastboot_fail("writing GPT partitions failed",
 551                                       response);
 552                         return;
 553                 }
 554                 part_init(dev_desc);
 555                 printf("........ success\n");
 556                 fastboot_okay(NULL, response);
 557                 return;
 558         }
 559 #endif
 560
 561 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 562         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 563                 dev_desc = fastboot_mmc_get_dev(response);
 564                 if (!dev_desc)
 565                         return;
 566
 567                 printf("%s: updating MBR\n", __func__);
 568                 if (is_valid_dos_buf(download_buffer)) {
 569                         printf("%s: invalid MBR - refusing to write to flash\n",
 570                                __func__);
 571                         fastboot_fail("invalid MBR partition", response);
 572                         return;
 573                 }
 574                 if (write_mbr_sector(dev_desc, download_buffer)) {
 575                         printf("%s: writing MBR partition failed\n", __func__);
 576                         fastboot_fail("writing MBR partition failed",
 577                                       response);
 578                         return;
 579                 }
 580                 part_init(dev_desc);
 581                 printf("........ success\n");
 582                 fastboot_okay(NULL, response);
 583                 return;
 584         }
 585 #endif
 586
 587 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 588         if (strncasecmp(cmd, "zimage", 6) == 0) {
 589                 dev_desc = fastboot_mmc_get_dev(response);
 590                 if (dev_desc)
 591                         fb_mmc_update_zimage(dev_desc, download_buffer,
 592                                              download_bytes, response);
 593                 return;
 594         }
 595 #endif
 596
 597 #if CONFIG_IS_ENABLED(FASTBOOT_MMC_USER_SUPPORT)
 598         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 599                 dev_desc = fastboot_mmc_get_dev(response);
 600                 if (!dev_desc)
 601                         return;
 602
 603                 strlcpy((char *)&info.name, cmd, sizeof(info.name));
 604                 info.size       = dev_desc->lba;
 605                 info.blksz      = dev_desc->blksz;
 606         }
 607 #endif
 608
 609         if (!info.name[0] &&
 610             fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 611                 return;
 612
 613         if (is_sparse_image(download_buffer)) {
 614                 struct fb_mmc_sparse sparse_priv;
 615                 struct sparse_storage sparse;
 616                 int err;
 617
 618                 sparse_priv.dev_desc = dev_desc;
 619
 620                 sparse.blksz = info.blksz;
 621                 sparse.start = info.start;
 622                 sparse.size = info.size;
 623                 sparse.write = fb_mmc_sparse_write;
 624                 sparse.reserve = fb_mmc_sparse_reserve;
 625                 sparse.mssg = fastboot_fail;
 626
 627                 printf("Flashing sparse image at offset " LBAFU "\n",
 628                        sparse.start);
 629
 630                 sparse.priv = &sparse_priv;
 631                 err = write_sparse_image(&sparse, cmd, download_buffer,
 632                                          response);
 633                 if (!err)
 634                         fastboot_okay(NULL, response);
 635         } else {
 636                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 637                                 download_bytes, response);
 638         }
 639 }
 640
 641 /**
 642  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
 643  *
 644  * @cmd: Named partition to erase
 645  * @response: Pointer to fastboot response buffer
 646  */
 647 void fastboot_mmc_erase(const char *cmd, char *response)
 648 {
 649         struct blk_desc *dev_desc;
 650         struct disk_partition info;
 651         lbaint_t blks, blks_start, blks_size, grp_size;
 652         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 653
 654 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
 655         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
 656                 /* erase EMMC boot1 */
 657                 dev_desc = fastboot_mmc_get_dev(response);
 658                 if (dev_desc)
 659                         fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
 660                 return;
 661         }
 662         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
 663                 /* erase EMMC boot2 */
 664                 dev_desc = fastboot_mmc_get_dev(response);
 665                 if (dev_desc)
 666                         fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
 667                 return;
 668         }
 669 #endif
 670
 671 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
 672         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
 673                 /* erase EMMC userdata */
 674                 dev_desc = fastboot_mmc_get_dev(response);
 675                 if (!dev_desc)
 676                         return;
 677
 678                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
 679                         fastboot_fail("Failed to erase EMMC_USER", response);
 680                 else
 681                         fastboot_okay(NULL, response);
 682                 return;
 683         }
 684 #endif
 685
 686         if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
 687                 return;
 688
 689         /* Align blocks to erase group size to avoid erasing other partitions */
 690         grp_size = mmc->erase_grp_size;
 691         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 692         if (info.size >= grp_size)
 693                 blks_size = (info.size - (blks_start - info.start)) &
 694                                 (~(grp_size - 1));
 695         else
 696                 blks_size = 0;
 697
 698         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 699                blks_start, blks_start + blks_size);
 700
 701         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
 702
 703         if (blks != blks_size) {
 704                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
 705                 fastboot_fail("failed erasing from device", response);
 706                 return;
 707         }
 708
 709         printf("........ erased " LBAFU " bytes from '%s'\n",
 710                blks_size * info.blksz, cmd);
 711         fastboot_okay(NULL, response);
 712 }