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
  17 #ifndef CONFIG_FASTBOOT_GPT_NAME
  18 #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
  19 #endif
  20
  21 struct fb_mmc_sparse {
  22         struct blk_desc *dev_desc;
  23 };
  24
  25 static int part_get_info_efi_by_name_or_alias(struct blk_desc *dev_desc,
  26                 const char *name, disk_partition_t *info)
  27 {
  28         int ret;
  29
  30         ret = part_get_info_efi_by_name(dev_desc, name, info);
  31         if (ret) {
  32                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  33                 char env_alias_name[25 + 32 + 1];
  34                 char *aliased_part_name;
  35
  36                 /* check for alias */
  37                 strcpy(env_alias_name, "fastboot_partition_alias_");
  38                 strncat(env_alias_name, name, 32);
  39                 aliased_part_name = getenv(env_alias_name);
  40                 if (aliased_part_name != NULL)
  41                         ret = part_get_info_efi_by_name(dev_desc,
  42                                         aliased_part_name, info);
  43         }
  44         return ret;
  45 }
  46
  47 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
  48                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
  49 {
  50         struct fb_mmc_sparse *sparse = info->priv;
  51         struct blk_desc *dev_desc = sparse->dev_desc;
  52
  53         return blk_dwrite(dev_desc, blk, blkcnt, buffer);
  54 }
  55
  56 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
  57                 lbaint_t blk, lbaint_t blkcnt)
  58 {
  59         return blkcnt;
  60 }
  61
  62 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
  63                 const char *part_name, void *buffer,
  64                 unsigned int download_bytes)
  65 {
  66         lbaint_t blkcnt;
  67         lbaint_t blks;
  68
  69         /* determine number of blocks to write */
  70         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
  71         blkcnt = lldiv(blkcnt, info->blksz);
  72
  73         if (blkcnt > info->size) {
  74                 error("too large for partition: '%s'\n", part_name);
  75                 fastboot_fail("too large for partition");
  76                 return;
  77         }
  78
  79         puts("Flashing Raw Image\n");
  80
  81         blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
  82         if (blks != blkcnt) {
  83                 error("failed writing to device %d\n", dev_desc->devnum);
  84                 fastboot_fail("failed writing to device");
  85                 return;
  86         }
  87
  88         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
  89                part_name);
  90         fastboot_okay("");
  91 }
  92
  93 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
  94                         unsigned int download_bytes)
  95 {
  96         struct blk_desc *dev_desc;
  97         disk_partition_t info;
  98
  99         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 100         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 101                 error("invalid mmc device\n");
 102                 fastboot_fail("invalid mmc device");
 103                 return;
 104         }
 105
 106         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 107                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 108                        __func__);
 109                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 110                         printf("%s: invalid GPT - refusing to write to flash\n",
 111                                __func__);
 112                         fastboot_fail("invalid GPT partition");
 113                         return;
 114                 }
 115                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 116                         printf("%s: writing GPT partitions failed\n", __func__);
 117                         fastboot_fail(
 118                                       "writing GPT partitions failed");
 119                         return;
 120                 }
 121                 printf("........ success\n");
 122                 fastboot_okay("");
 123                 return;
 124         } else if (part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
 125                 error("cannot find partition: '%s'\n", cmd);
 126                 fastboot_fail("cannot find partition");
 127                 return;
 128         }
 129
 130         if (is_sparse_image(download_buffer)) {
 131                 struct fb_mmc_sparse sparse_priv;
 132                 struct sparse_storage sparse;
 133
 134                 sparse_priv.dev_desc = dev_desc;
 135
 136                 sparse.blksz = info.blksz;
 137                 sparse.start = info.start;
 138                 sparse.size = info.size;
 139                 sparse.write = fb_mmc_sparse_write;
 140                 sparse.reserve = fb_mmc_sparse_reserve;
 141
 142                 printf("Flashing sparse image at offset " LBAFU "\n",
 143                        sparse.start);
 144
 145                 sparse.priv = &sparse_priv;
 146                 write_sparse_image(&sparse, cmd, download_buffer,
 147                                    download_bytes);
 148         } else {
 149                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 150                                 download_bytes);
 151         }
 152 }
 153
 154 void fb_mmc_erase(const char *cmd)
 155 {
 156         int ret;
 157         struct blk_desc *dev_desc;
 158         disk_partition_t info;
 159         lbaint_t blks, blks_start, blks_size, grp_size;
 160         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 161
 162         if (mmc == NULL) {
 163                 error("invalid mmc device");
 164                 fastboot_fail("invalid mmc device");
 165                 return;
 166         }
 167
 168         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 169         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 170                 error("invalid mmc device");
 171                 fastboot_fail("invalid mmc device");
 172                 return;
 173         }
 174
 175         ret = part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 176         if (ret) {
 177                 error("cannot find partition: '%s'", cmd);
 178                 fastboot_fail("cannot find partition");
 179                 return;
 180         }
 181
 182         /* Align blocks to erase group size to avoid erasing other partitions */
 183         grp_size = mmc->erase_grp_size;
 184         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 185         if (info.size >= grp_size)
 186                 blks_size = (info.size - (blks_start - info.start)) &
 187                                 (~(grp_size - 1));
 188         else
 189                 blks_size = 0;
 190
 191         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 192                blks_start, blks_start + blks_size);
 193
 194         blks = blk_derase(dev_desc, blks_start, blks_size);
 195         if (blks != blks_size) {
 196                 error("failed erasing from device %d", dev_desc->devnum);
 197                 fastboot_fail("failed erasing from device");
 198                 return;
 199         }
 200
 201         printf("........ erased " LBAFU " bytes from '%s'\n",
 202                blks_size * info.blksz, cmd);
 203         fastboot_okay("");
 204 }