git.sur5r.net Git - u-boot/blob - 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 <fastboot.h>
  10 #include <fb_mmc.h>
  11 #include <image-sparse.h>
  12 #include <part.h>
  13 #include <mmc.h>
  14 #include <div64.h>
  15 #include <linux/compat.h>
  16 #include <android_image.h>
  17
  18 /*
  19  * FIXME: Ensure we always set these names via Kconfig once xxx_PARTITION is
  20  * migrated
  21  */
  22 #ifndef CONFIG_FASTBOOT_GPT_NAME
  23 #define CONFIG_FASTBOOT_GPT_NAME "gpt"
  24 #endif
  25
  26
  27 #ifndef CONFIG_FASTBOOT_MBR_NAME
  28 #define CONFIG_FASTBOOT_MBR_NAME "mbr"
  29 #endif
  30
  31 #define BOOT_PARTITION_NAME "boot"
  32
  33 struct fb_mmc_sparse {
  34         struct blk_desc *dev_desc;
  35 };
  36
  37 static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
  38                 const char *name, disk_partition_t *info)
  39 {
  40         int ret;
  41
  42         ret = part_get_info_by_name(dev_desc, name, info);
  43         if (ret < 0) {
  44                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  45                 char env_alias_name[25 + 32 + 1];
  46                 char *aliased_part_name;
  47
  48                 /* check for alias */
  49                 strcpy(env_alias_name, "fastboot_partition_alias_");
  50                 strncat(env_alias_name, name, 32);
  51                 aliased_part_name = env_get(env_alias_name);
  52                 if (aliased_part_name != NULL)
  53                         ret = part_get_info_by_name(dev_desc,
  54                                         aliased_part_name, info);
  55         }
  56         return ret;
  57 }
  58
  59 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
  60                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
  61 {
  62         struct fb_mmc_sparse *sparse = info->priv;
  63         struct blk_desc *dev_desc = sparse->dev_desc;
  64
  65         return blk_dwrite(dev_desc, blk, blkcnt, buffer);
  66 }
  67
  68 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
  69                 lbaint_t blk, lbaint_t blkcnt)
  70 {
  71         return blkcnt;
  72 }
  73
  74 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
  75                 const char *part_name, void *buffer,
  76                 unsigned int download_bytes, char *response)
  77 {
  78         lbaint_t blkcnt;
  79         lbaint_t blks;
  80
  81         /* determine number of blocks to write */
  82         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
  83         blkcnt = lldiv(blkcnt, info->blksz);
  84
  85         if (blkcnt > info->size) {
  86                 pr_err("too large for partition: '%s'\n", part_name);
  87                 fastboot_fail("too large for partition", response);
  88                 return;
  89         }
  90
  91         puts("Flashing Raw Image\n");
  92
  93         blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
  94         if (blks != blkcnt) {
  95                 pr_err("failed writing to device %d\n", dev_desc->devnum);
  96                 fastboot_fail("failed writing to device", response);
  97                 return;
  98         }
  99
 100         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 101                part_name);
 102         fastboot_okay(NULL, response);
 103 }
 104
 105 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 106 /**
 107  * Read Android boot image header from boot partition.
 108  *
 109  * @param[in] dev_desc MMC device descriptor
 110  * @param[in] info Boot partition info
 111  * @param[out] hdr Where to store read boot image header
 112  *
 113  * @return Boot image header sectors count or 0 on error
 114  */
 115 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 116                                        disk_partition_t *info,
 117                                        struct andr_img_hdr *hdr,
 118                                        char *response)
 119 {
 120         ulong sector_size;              /* boot partition sector size */
 121         lbaint_t hdr_sectors;           /* boot image header sectors count */
 122         int res;
 123
 124         /* Calculate boot image sectors count */
 125         sector_size = info->blksz;
 126         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
 127         if (hdr_sectors == 0) {
 128                 pr_err("invalid number of boot sectors: 0");
 129                 fastboot_fail("invalid number of boot sectors: 0", response);
 130                 return 0;
 131         }
 132
 133         /* Read the boot image header */
 134         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
 135         if (res != hdr_sectors) {
 136                 pr_err("cannot read header from boot partition");
 137                 fastboot_fail("cannot read header from boot partition",
 138                               response);
 139                 return 0;
 140         }
 141
 142         /* Check boot header magic string */
 143         res = android_image_check_header(hdr);
 144         if (res != 0) {
 145                 pr_err("bad boot image magic");
 146                 fastboot_fail("boot partition not initialized", response);
 147                 return 0;
 148         }
 149
 150         return hdr_sectors;
 151 }
 152
 153 /**
 154  * Write downloaded zImage to boot partition and repack it properly.
 155  *
 156  * @param dev_desc MMC device descriptor
 157  * @param download_buffer Address to fastboot buffer with zImage in it
 158  * @param download_bytes Size of fastboot buffer, in bytes
 159  *
 160  * @return 0 on success or -1 on error
 161  */
 162 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 163                                 void *download_buffer,
 164                                 unsigned int download_bytes,
 165                                 char *response)
 166 {
 167         uintptr_t hdr_addr;                     /* boot image header address */
 168         struct andr_img_hdr *hdr;               /* boot image header */
 169         lbaint_t hdr_sectors;                   /* boot image header sectors */
 170         u8 *ramdisk_buffer;
 171         u32 ramdisk_sector_start;
 172         u32 ramdisk_sectors;
 173         u32 kernel_sector_start;
 174         u32 kernel_sectors;
 175         u32 sectors_per_page;
 176         disk_partition_t info;
 177         int res;
 178
 179         puts("Flashing zImage\n");
 180
 181         /* Get boot partition info */
 182         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 183         if (res < 0) {
 184                 pr_err("cannot find boot partition");
 185                 fastboot_fail("cannot find boot partition", response);
 186                 return -1;
 187         }
 188
 189         /* Put boot image header in fastboot buffer after downloaded zImage */
 190         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 191         hdr = (struct andr_img_hdr *)hdr_addr;
 192
 193         /* Read boot image header */
 194         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
 195         if (hdr_sectors == 0) {
 196                 pr_err("unable to read boot image header");
 197                 fastboot_fail("unable to read boot image header", response);
 198                 return -1;
 199         }
 200
 201         /* Check if boot image has second stage in it (we don't support it) */
 202         if (hdr->second_size > 0) {
 203                 pr_err("moving second stage is not supported yet");
 204                 fastboot_fail("moving second stage is not supported yet",
 205                               response);
 206                 return -1;
 207         }
 208
 209         /* Extract ramdisk location */
 210         sectors_per_page = hdr->page_size / info.blksz;
 211         ramdisk_sector_start = info.start + sectors_per_page;
 212         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 213                                              sectors_per_page;
 214         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 215                                        sectors_per_page;
 216
 217         /* Read ramdisk and put it in fastboot buffer after boot image header */
 218         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 219         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 220                         ramdisk_buffer);
 221         if (res != ramdisk_sectors) {
 222                 pr_err("cannot read ramdisk from boot partition");
 223                 fastboot_fail("cannot read ramdisk from boot partition",
 224                               response);
 225                 return -1;
 226         }
 227
 228         /* Write new kernel size to boot image header */
 229         hdr->kernel_size = download_bytes;
 230         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 231         if (res == 0) {
 232                 pr_err("cannot writeback boot image header");
 233                 fastboot_fail("cannot write back boot image header", response);
 234                 return -1;
 235         }
 236
 237         /* Write the new downloaded kernel */
 238         kernel_sector_start = info.start + sectors_per_page;
 239         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 240                                       sectors_per_page;
 241         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 242                          download_buffer);
 243         if (res == 0) {
 244                 pr_err("cannot write new kernel");
 245                 fastboot_fail("cannot write new kernel", response);
 246                 return -1;
 247         }
 248
 249         /* Write the saved ramdisk back */
 250         ramdisk_sector_start = info.start + sectors_per_page;
 251         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 252                                              sectors_per_page;
 253         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 254                          ramdisk_buffer);
 255         if (res == 0) {
 256                 pr_err("cannot write back original ramdisk");
 257                 fastboot_fail("cannot write back original ramdisk", response);
 258                 return -1;
 259         }
 260
 261         puts("........ zImage was updated in boot partition\n");
 262         fastboot_okay(NULL, response);
 263         return 0;
 264 }
 265 #endif
 266
 267 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 268                         unsigned int download_bytes, char *response)
 269 {
 270         struct blk_desc *dev_desc;
 271         disk_partition_t info;
 272
 273         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 274         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 275                 pr_err("invalid mmc device\n");
 276                 fastboot_fail("invalid mmc device", response);
 277                 return;
 278         }
 279
 280 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 281         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 282                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 283                        __func__);
 284                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 285                         printf("%s: invalid GPT - refusing to write to flash\n",
 286                                __func__);
 287                         fastboot_fail("invalid GPT partition", response);
 288                         return;
 289                 }
 290                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 291                         printf("%s: writing GPT partitions failed\n", __func__);
 292                         fastboot_fail("writing GPT partitions failed",
 293                                       response);
 294                         return;
 295                 }
 296                 printf("........ success\n");
 297                 fastboot_okay(NULL, response);
 298                 return;
 299         }
 300 #endif
 301
 302 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 303         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 304                 printf("%s: updating MBR\n", __func__);
 305                 if (is_valid_dos_buf(download_buffer)) {
 306                         printf("%s: invalid MBR - refusing to write to flash\n",
 307                                __func__);
 308                         fastboot_fail("invalid MBR partition", response);
 309                         return;
 310                 }
 311                 if (write_mbr_partition(dev_desc, download_buffer)) {
 312                         printf("%s: writing MBR partition failed\n", __func__);
 313                         fastboot_fail("writing MBR partition failed",
 314                                       response);
 315                         return;
 316                 }
 317                 printf("........ success\n");
 318                 fastboot_okay(NULL, response);
 319                 return;
 320         }
 321 #endif
 322
 323 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 324         if (strncasecmp(cmd, "zimage", 6) == 0) {
 325                 fb_mmc_update_zimage(dev_desc, download_buffer,
 326                                      download_bytes, response);
 327                 return;
 328         }
 329 #endif
 330
 331         if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 332                 pr_err("cannot find partition: '%s'\n", cmd);
 333                 fastboot_fail("cannot find partition", response);
 334                 return;
 335         }
 336
 337         if (is_sparse_image(download_buffer)) {
 338                 struct fb_mmc_sparse sparse_priv;
 339                 struct sparse_storage sparse;
 340                 int err;
 341
 342                 sparse_priv.dev_desc = dev_desc;
 343
 344                 sparse.blksz = info.blksz;
 345                 sparse.start = info.start;
 346                 sparse.size = info.size;
 347                 sparse.write = fb_mmc_sparse_write;
 348                 sparse.reserve = fb_mmc_sparse_reserve;
 349                 sparse.mssg = fastboot_fail;
 350
 351                 printf("Flashing sparse image at offset " LBAFU "\n",
 352                        sparse.start);
 353
 354                 sparse.priv = &sparse_priv;
 355                 err = write_sparse_image(&sparse, cmd, download_buffer,
 356                                          response);
 357                 if (!err)
 358                         fastboot_okay(NULL, response);
 359         } else {
 360                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 361                                 download_bytes, response);
 362         }
 363 }
 364
 365 void fb_mmc_erase(const char *cmd, char *response)
 366 {
 367         int ret;
 368         struct blk_desc *dev_desc;
 369         disk_partition_t info;
 370         lbaint_t blks, blks_start, blks_size, grp_size;
 371         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 372
 373         if (mmc == NULL) {
 374                 pr_err("invalid mmc device");
 375                 fastboot_fail("invalid mmc device", response);
 376                 return;
 377         }
 378
 379         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 380         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 381                 pr_err("invalid mmc device");
 382                 fastboot_fail("invalid mmc device", response);
 383                 return;
 384         }
 385
 386         ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);
 387         if (ret < 0) {
 388                 pr_err("cannot find partition: '%s'", cmd);
 389                 fastboot_fail("cannot find partition", response);
 390                 return;
 391         }
 392
 393         /* Align blocks to erase group size to avoid erasing other partitions */
 394         grp_size = mmc->erase_grp_size;
 395         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 396         if (info.size >= grp_size)
 397                 blks_size = (info.size - (blks_start - info.start)) &
 398                                 (~(grp_size - 1));
 399         else
 400                 blks_size = 0;
 401
 402         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 403                blks_start, blks_start + blks_size);
 404
 405         blks = blk_derase(dev_desc, blks_start, blks_size);
 406         if (blks != blks_size) {
 407                 pr_err("failed erasing from device %d", dev_desc->devnum);
 408                 fastboot_fail("failed erasing from device", response);
 409                 return;
 410         }
 411
 412         printf("........ erased " LBAFU " bytes from '%s'\n",
 413                blks_size * info.blksz, cmd);
 414         fastboot_okay(NULL, response);
 415 }