common/fb_mmc.c

   1 /*
   2  * Copyright 2014 Broadcom Corporation.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <config.h>
   8 #include <common.h>
   9 #include <blk.h>
  10 #include <fastboot.h>
  11 #include <fb_mmc.h>
  12 #include <image-sparse.h>
  13 #include <part.h>
  14 #include <mmc.h>
  15 #include <div64.h>
  16 #include <linux/compat.h>
  17 #include <android_image.h>
  18
  19 /*
  20  * FIXME: Ensure we always set these names via Kconfig once xxx_PARTITION is
  21  * migrated
  22  */
  23 #ifndef CONFIG_FASTBOOT_GPT_NAME
  24 #define CONFIG_FASTBOOT_GPT_NAME "gpt"
  25 #endif
  26
  27
  28 #ifndef CONFIG_FASTBOOT_MBR_NAME
  29 #define CONFIG_FASTBOOT_MBR_NAME "mbr"
  30 #endif
  31
  32 #define BOOT_PARTITION_NAME "boot"
  33
  34 struct fb_mmc_sparse {
  35         struct blk_desc *dev_desc;
  36 };
  37
  38 static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
  39                 const char *name, disk_partition_t *info)
  40 {
  41         int ret;
  42
  43         ret = part_get_info_by_name(dev_desc, name, info);
  44         if (ret < 0) {
  45                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  46                 char env_alias_name[25 + 32 + 1];
  47                 char *aliased_part_name;
  48
  49                 /* check for alias */
  50                 strcpy(env_alias_name, "fastboot_partition_alias_");
  51                 strncat(env_alias_name, name, 32);
  52                 aliased_part_name = env_get(env_alias_name);
  53                 if (aliased_part_name != NULL)
  54                         ret = part_get_info_by_name(dev_desc,
  55                                         aliased_part_name, info);
  56         }
  57         return ret;
  58 }
  59
  60 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
  61                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
  62 {
  63         struct fb_mmc_sparse *sparse = info->priv;
  64         struct blk_desc *dev_desc = sparse->dev_desc;
  65
  66         return blk_dwrite(dev_desc, blk, blkcnt, buffer);
  67 }
  68
  69 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
  70                 lbaint_t blk, lbaint_t blkcnt)
  71 {
  72         return blkcnt;
  73 }
  74
  75 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
  76                 const char *part_name, void *buffer,
  77                 unsigned int download_bytes)
  78 {
  79         lbaint_t blkcnt;
  80         lbaint_t blks;
  81
  82         /* determine number of blocks to write */
  83         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
  84         blkcnt = lldiv(blkcnt, info->blksz);
  85
  86         if (blkcnt > info->size) {
  87                 pr_err("too large for partition: '%s'\n", part_name);
  88                 fastboot_fail("too large for partition");
  89                 return;
  90         }
  91
  92         puts("Flashing Raw Image\n");
  93
  94         blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
  95         if (blks != blkcnt) {
  96                 pr_err("failed writing to device %d\n", dev_desc->devnum);
  97                 fastboot_fail("failed writing to device");
  98                 return;
  99         }
 100
 101         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
 102                part_name);
 103         fastboot_okay("");
 104 }
 105
 106 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 107 /**
 108  * Read Android boot image header from boot partition.
 109  *
 110  * @param[in] dev_desc MMC device descriptor
 111  * @param[in] info Boot partition info
 112  * @param[out] hdr Where to store read boot image header
 113  *
 114  * @return Boot image header sectors count or 0 on error
 115  */
 116 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
 117                                        disk_partition_t *info,
 118                                        struct andr_img_hdr *hdr)
 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");
 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                 return 0;
 139         }
 140
 141         /* Check boot header magic string */
 142         res = android_image_check_header(hdr);
 143         if (res != 0) {
 144                 pr_err("bad boot image magic");
 145                 fastboot_fail("boot partition not initialized");
 146                 return 0;
 147         }
 148
 149         return hdr_sectors;
 150 }
 151
 152 /**
 153  * Write downloaded zImage to boot partition and repack it properly.
 154  *
 155  * @param dev_desc MMC device descriptor
 156  * @param download_buffer Address to fastboot buffer with zImage in it
 157  * @param download_bytes Size of fastboot buffer, in bytes
 158  *
 159  * @return 0 on success or -1 on error
 160  */
 161 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
 162                                 void *download_buffer,
 163                                 unsigned int download_bytes)
 164 {
 165         uintptr_t hdr_addr;                     /* boot image header address */
 166         struct andr_img_hdr *hdr;               /* boot image header */
 167         lbaint_t hdr_sectors;                   /* boot image header sectors */
 168         u8 *ramdisk_buffer;
 169         u32 ramdisk_sector_start;
 170         u32 ramdisk_sectors;
 171         u32 kernel_sector_start;
 172         u32 kernel_sectors;
 173         u32 sectors_per_page;
 174         disk_partition_t info;
 175         int res;
 176
 177         puts("Flashing zImage\n");
 178
 179         /* Get boot partition info */
 180         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
 181         if (res < 0) {
 182                 pr_err("cannot find boot partition");
 183                 fastboot_fail("cannot find boot partition");
 184                 return -1;
 185         }
 186
 187         /* Put boot image header in fastboot buffer after downloaded zImage */
 188         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
 189         hdr = (struct andr_img_hdr *)hdr_addr;
 190
 191         /* Read boot image header */
 192         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr);
 193         if (hdr_sectors == 0) {
 194                 pr_err("unable to read boot image header");
 195                 fastboot_fail("unable to read boot image header");
 196                 return -1;
 197         }
 198
 199         /* Check if boot image has second stage in it (we don't support it) */
 200         if (hdr->second_size > 0) {
 201                 pr_err("moving second stage is not supported yet");
 202                 fastboot_fail("moving second stage is not supported yet");
 203                 return -1;
 204         }
 205
 206         /* Extract ramdisk location */
 207         sectors_per_page = hdr->page_size / info.blksz;
 208         ramdisk_sector_start = info.start + sectors_per_page;
 209         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 210                                              sectors_per_page;
 211         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
 212                                        sectors_per_page;
 213
 214         /* Read ramdisk and put it in fastboot buffer after boot image header */
 215         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
 216         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 217                         ramdisk_buffer);
 218         if (res != ramdisk_sectors) {
 219                 pr_err("cannot read ramdisk from boot partition");
 220                 fastboot_fail("cannot read ramdisk from boot partition");
 221                 return -1;
 222         }
 223
 224         /* Write new kernel size to boot image header */
 225         hdr->kernel_size = download_bytes;
 226         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
 227         if (res == 0) {
 228                 pr_err("cannot writeback boot image header");
 229                 fastboot_fail("cannot write back boot image header");
 230                 return -1;
 231         }
 232
 233         /* Write the new downloaded kernel */
 234         kernel_sector_start = info.start + sectors_per_page;
 235         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 236                                       sectors_per_page;
 237         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
 238                          download_buffer);
 239         if (res == 0) {
 240                 pr_err("cannot write new kernel");
 241                 fastboot_fail("cannot write new kernel");
 242                 return -1;
 243         }
 244
 245         /* Write the saved ramdisk back */
 246         ramdisk_sector_start = info.start + sectors_per_page;
 247         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
 248                                              sectors_per_page;
 249         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
 250                          ramdisk_buffer);
 251         if (res == 0) {
 252                 pr_err("cannot write back original ramdisk");
 253                 fastboot_fail("cannot write back original ramdisk");
 254                 return -1;
 255         }
 256
 257         puts("........ zImage was updated in boot partition\n");
 258         fastboot_okay("");
 259         return 0;
 260 }
 261 #endif
 262
 263 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
 264                         unsigned int download_bytes)
 265 {
 266         struct blk_desc *dev_desc;
 267         disk_partition_t info;
 268
 269         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 270         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 271                 pr_err("invalid mmc device\n");
 272                 fastboot_fail("invalid mmc device");
 273                 return;
 274         }
 275
 276 #if CONFIG_IS_ENABLED(EFI_PARTITION)
 277         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 278                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 279                        __func__);
 280                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 281                         printf("%s: invalid GPT - refusing to write to flash\n",
 282                                __func__);
 283                         fastboot_fail("invalid GPT partition");
 284                         return;
 285                 }
 286                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 287                         printf("%s: writing GPT partitions failed\n", __func__);
 288                         fastboot_fail("writing GPT partitions failed");
 289                         return;
 290                 }
 291                 printf("........ success\n");
 292                 fastboot_okay("");
 293                 return;
 294         }
 295 #endif
 296
 297 #if CONFIG_IS_ENABLED(DOS_PARTITION)
 298         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
 299                 printf("%s: updating MBR\n", __func__);
 300                 if (is_valid_dos_buf(download_buffer)) {
 301                         printf("%s: invalid MBR - refusing to write to flash\n",
 302                                __func__);
 303                         fastboot_fail("invalid MBR partition");
 304                         return;
 305                 }
 306                 if (write_mbr_partition(dev_desc, download_buffer)) {
 307                         printf("%s: writing MBR partition failed\n", __func__);
 308                         fastboot_fail("writing MBR partition failed");
 309                         return;
 310                 }
 311                 printf("........ success\n");
 312                 fastboot_okay("");
 313                 return;
 314         }
 315 #endif
 316
 317 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 318         if (strncasecmp(cmd, "zimage", 6) == 0) {
 319                 fb_mmc_update_zimage(dev_desc, download_buffer, download_bytes);
 320                 return;
 321         }
 322 #endif
 323
 324         if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
 325                 pr_err("cannot find partition: '%s'\n", cmd);
 326                 fastboot_fail("cannot find partition");
 327                 return;
 328         }
 329
 330         if (is_sparse_image(download_buffer)) {
 331                 struct fb_mmc_sparse sparse_priv;
 332                 struct sparse_storage sparse;
 333
 334                 sparse_priv.dev_desc = dev_desc;
 335
 336                 sparse.blksz = info.blksz;
 337                 sparse.start = info.start;
 338                 sparse.size = info.size;
 339                 sparse.write = fb_mmc_sparse_write;
 340                 sparse.reserve = fb_mmc_sparse_reserve;
 341
 342                 printf("Flashing sparse image at offset " LBAFU "\n",
 343                        sparse.start);
 344
 345                 sparse.priv = &sparse_priv;
 346                 write_sparse_image(&sparse, cmd, download_buffer,
 347                                    download_bytes);
 348         } else {
 349                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 350                                 download_bytes);
 351         }
 352 }
 353
 354 void fb_mmc_erase(const char *cmd)
 355 {
 356         int ret;
 357         struct blk_desc *dev_desc;
 358         disk_partition_t info;
 359         lbaint_t blks, blks_start, blks_size, grp_size;
 360         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 361
 362         if (mmc == NULL) {
 363                 pr_err("invalid mmc device");
 364                 fastboot_fail("invalid mmc device");
 365                 return;
 366         }
 367
 368         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 369         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 370                 pr_err("invalid mmc device");
 371                 fastboot_fail("invalid mmc device");
 372                 return;
 373         }
 374
 375         ret = part_get_info_by_name_or_alias(dev_desc, cmd, &info);
 376         if (ret < 0) {
 377                 pr_err("cannot find partition: '%s'", cmd);
 378                 fastboot_fail("cannot find partition");
 379                 return;
 380         }
 381
 382         /* Align blocks to erase group size to avoid erasing other partitions */
 383         grp_size = mmc->erase_grp_size;
 384         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 385         if (info.size >= grp_size)
 386                 blks_size = (info.size - (blks_start - info.start)) &
 387                                 (~(grp_size - 1));
 388         else
 389                 blks_size = 0;
 390
 391         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 392                blks_start, blks_start + blks_size);
 393
 394         blks = blk_derase(dev_desc, blks_start, blks_size);
 395         if (blks != blks_size) {
 396                 pr_err("failed erasing from device %d", dev_desc->devnum);
 397                 fastboot_fail("failed erasing from device");
 398                 return;
 399         }
 400
 401         printf("........ erased " LBAFU " bytes from '%s'\n",
 402                blks_size * info.blksz, cmd);
 403         fastboot_okay("");
 404 }