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 static char *response_str;
  22
  23 struct fb_mmc_sparse {
  24         struct blk_desc *dev_desc;
  25 };
  26
  27 static int part_get_info_efi_by_name_or_alias(struct blk_desc *dev_desc,
  28                 const char *name, disk_partition_t *info)
  29 {
  30         int ret;
  31
  32         ret = part_get_info_efi_by_name(dev_desc, name, info);
  33         if (ret) {
  34                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  35                 char env_alias_name[25 + 32 + 1];
  36                 char *aliased_part_name;
  37
  38                 /* check for alias */
  39                 strcpy(env_alias_name, "fastboot_partition_alias_");
  40                 strncat(env_alias_name, name, 32);
  41                 aliased_part_name = getenv(env_alias_name);
  42                 if (aliased_part_name != NULL)
  43                         ret = part_get_info_efi_by_name(dev_desc,
  44                                         aliased_part_name, info);
  45         }
  46         return ret;
  47 }
  48
  49 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
  50                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
  51 {
  52         struct fb_mmc_sparse *sparse = info->priv;
  53         struct blk_desc *dev_desc = sparse->dev_desc;
  54
  55         return blk_dwrite(dev_desc, blk, blkcnt, buffer);
  56 }
  57
  58 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
  59                 const char *part_name, void *buffer,
  60                 unsigned int download_bytes)
  61 {
  62         lbaint_t blkcnt;
  63         lbaint_t blks;
  64
  65         /* determine number of blocks to write */
  66         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
  67         blkcnt = lldiv(blkcnt, info->blksz);
  68
  69         if (blkcnt > info->size) {
  70                 error("too large for partition: '%s'\n", part_name);
  71                 fastboot_fail(response_str, "too large for partition");
  72                 return;
  73         }
  74
  75         puts("Flashing Raw Image\n");
  76
  77         blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
  78         if (blks != blkcnt) {
  79                 error("failed writing to device %d\n", dev_desc->devnum);
  80                 fastboot_fail(response_str, "failed writing to device");
  81                 return;
  82         }
  83
  84         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
  85                part_name);
  86         fastboot_okay(response_str, "");
  87 }
  88
  89 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
  90                         unsigned int download_bytes, char *response)
  91 {
  92         struct blk_desc *dev_desc;
  93         disk_partition_t info;
  94
  95         /* initialize the response buffer */
  96         response_str = response;
  97
  98         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
  99         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 100                 error("invalid mmc device\n");
 101                 fastboot_fail(response_str, "invalid mmc device");
 102                 return;
 103         }
 104
 105         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 106                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 107                        __func__);
 108                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 109                         printf("%s: invalid GPT - refusing to write to flash\n",
 110                                __func__);
 111                         fastboot_fail(response_str, "invalid GPT partition");
 112                         return;
 113                 }
 114                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 115                         printf("%s: writing GPT partitions failed\n", __func__);
 116                         fastboot_fail(response_str,
 117                                       "writing GPT partitions failed");
 118                         return;
 119                 }
 120                 printf("........ success\n");
 121                 fastboot_okay(response_str, "");
 122                 return;
 123         } else if (part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
 124                 error("cannot find partition: '%s'\n", cmd);
 125                 fastboot_fail(response_str, "cannot find partition");
 126                 return;
 127         }
 128
 129         if (is_sparse_image(download_buffer)) {
 130                 struct fb_mmc_sparse sparse_priv;
 131                 struct sparse_storage sparse;
 132
 133                 sparse_priv.dev_desc = dev_desc;
 134
 135                 sparse.blksz = info.blksz;
 136                 sparse.start = info.start;
 137                 sparse.size = info.size;
 138                 sparse.write = fb_mmc_sparse_write;
 139
 140                 printf("Flashing sparse image at offset " LBAFU "\n",
 141                        sparse.start);
 142
 143                 sparse.priv = &sparse_priv;
 144                 write_sparse_image(&sparse, cmd, download_buffer,
 145                                    download_bytes, response_str);
 146         } else {
 147                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 148                                 download_bytes);
 149         }
 150 }
 151
 152 void fb_mmc_erase(const char *cmd, char *response)
 153 {
 154         int ret;
 155         struct blk_desc *dev_desc;
 156         disk_partition_t info;
 157         lbaint_t blks, blks_start, blks_size, grp_size;
 158         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 159
 160         if (mmc == NULL) {
 161                 error("invalid mmc device");
 162                 fastboot_fail(response_str, "invalid mmc device");
 163                 return;
 164         }
 165
 166         /* initialize the response buffer */
 167         response_str = response;
 168
 169         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 170         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 171                 error("invalid mmc device");
 172                 fastboot_fail(response_str, "invalid mmc device");
 173                 return;
 174         }
 175
 176         ret = part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 177         if (ret) {
 178                 error("cannot find partition: '%s'", cmd);
 179                 fastboot_fail(response_str, "cannot find partition");
 180                 return;
 181         }
 182
 183         /* Align blocks to erase group size to avoid erasing other partitions */
 184         grp_size = mmc->erase_grp_size;
 185         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 186         if (info.size >= grp_size)
 187                 blks_size = (info.size - (blks_start - info.start)) &
 188                                 (~(grp_size - 1));
 189         else
 190                 blks_size = 0;
 191
 192         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 193                blks_start, blks_start + blks_size);
 194
 195         blks = dev_desc->block_erase(dev_desc, blks_start, blks_size);
 196         if (blks != blks_size) {
 197                 error("failed erasing from device %d", dev_desc->devnum);
 198                 fastboot_fail(response_str, "failed erasing from device");
 199                 return;
 200         }
 201
 202         printf("........ erased " LBAFU " bytes from '%s'\n",
 203                blks_size * info.blksz, cmd);
 204         fastboot_okay(response_str, "");
 205 }