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 <errno.h>
  11 #include <fastboot.h>
  12 #include <fb_mmc.h>
  13 #include <image-sparse.h>
  14 #include <part.h>
  15 #include <sparse_format.h>
  16 #include <mmc.h>
  17 #include <div64.h>
  18
  19 #ifndef CONFIG_FASTBOOT_GPT_NAME
  20 #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
  21 #endif
  22
  23 static char *response_str;
  24
  25 struct fb_mmc_sparse {
  26         struct blk_desc *dev_desc;
  27 };
  28
  29 static int part_get_info_efi_by_name_or_alias(struct blk_desc *dev_desc,
  30                 const char *name, disk_partition_t *info)
  31 {
  32         int ret;
  33
  34         ret = part_get_info_efi_by_name(dev_desc, name, info);
  35         if (ret) {
  36                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  37                 char env_alias_name[25 + 32 + 1];
  38                 char *aliased_part_name;
  39
  40                 /* check for alias */
  41                 strcpy(env_alias_name, "fastboot_partition_alias_");
  42                 strncat(env_alias_name, name, 32);
  43                 aliased_part_name = getenv(env_alias_name);
  44                 if (aliased_part_name != NULL)
  45                         ret = part_get_info_efi_by_name(dev_desc,
  46                                         aliased_part_name, info);
  47         }
  48         return ret;
  49 }
  50
  51
  52 static int fb_mmc_sparse_write(struct sparse_storage *storage,
  53                                void *priv,
  54                                unsigned int offset,
  55                                unsigned int size,
  56                                char *data)
  57 {
  58         struct fb_mmc_sparse *sparse = priv;
  59         struct blk_desc *dev_desc = sparse->dev_desc;
  60         int ret;
  61
  62         ret = blk_dwrite(dev_desc, offset, size, data);
  63         if (!ret)
  64                 return -EIO;
  65
  66         return ret;
  67 }
  68
  69 static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
  70                 const char *part_name, void *buffer,
  71                 unsigned int download_bytes)
  72 {
  73         lbaint_t blkcnt;
  74         lbaint_t blks;
  75
  76         /* determine number of blocks to write */
  77         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
  78         blkcnt = lldiv(blkcnt, info->blksz);
  79
  80         if (blkcnt > info->size) {
  81                 error("too large for partition: '%s'\n", part_name);
  82                 fastboot_fail(response_str, "too large for partition");
  83                 return;
  84         }
  85
  86         puts("Flashing Raw Image\n");
  87
  88         blks = blk_dwrite(dev_desc, info->start, blkcnt, buffer);
  89         if (blks != blkcnt) {
  90                 error("failed writing to device %d\n", dev_desc->devnum);
  91                 fastboot_fail(response_str, "failed writing to device");
  92                 return;
  93         }
  94
  95         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
  96                part_name);
  97         fastboot_okay(response_str, "");
  98 }
  99
 100 void fb_mmc_flash_write(const char *cmd, unsigned int session_id,
 101                         void *download_buffer, unsigned int download_bytes,
 102                         char *response)
 103 {
 104         struct blk_desc *dev_desc;
 105         disk_partition_t info;
 106
 107         /* initialize the response buffer */
 108         response_str = response;
 109
 110         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 111         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 112                 error("invalid mmc device\n");
 113                 fastboot_fail(response_str, "invalid mmc device");
 114                 return;
 115         }
 116
 117         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
 118                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
 119                        __func__);
 120                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
 121                         printf("%s: invalid GPT - refusing to write to flash\n",
 122                                __func__);
 123                         fastboot_fail(response_str, "invalid GPT partition");
 124                         return;
 125                 }
 126                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
 127                         printf("%s: writing GPT partitions failed\n", __func__);
 128                         fastboot_fail(response_str,
 129                                       "writing GPT partitions failed");
 130                         return;
 131                 }
 132                 printf("........ success\n");
 133                 fastboot_okay(response_str, "");
 134                 return;
 135         } else if (part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
 136                 error("cannot find partition: '%s'\n", cmd);
 137                 fastboot_fail(response_str, "cannot find partition");
 138                 return;
 139         }
 140
 141         if (is_sparse_image(download_buffer)) {
 142                 struct fb_mmc_sparse sparse_priv;
 143                 sparse_storage_t sparse;
 144
 145                 sparse_priv.dev_desc = dev_desc;
 146
 147                 sparse.block_sz = info.blksz;
 148                 sparse.start = info.start;
 149                 sparse.size = info.size;
 150                 sparse.name = cmd;
 151                 sparse.write = fb_mmc_sparse_write;
 152
 153                 printf("Flashing sparse image at offset " LBAFU "\n",
 154                        info.start);
 155
 156                 store_sparse_image(&sparse, &sparse_priv, session_id,
 157                                    download_buffer);
 158         } else {
 159                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 160                                 download_bytes);
 161         }
 162
 163         fastboot_okay(response_str, "");
 164 }
 165
 166 void fb_mmc_erase(const char *cmd, char *response)
 167 {
 168         int ret;
 169         struct blk_desc *dev_desc;
 170         disk_partition_t info;
 171         lbaint_t blks, blks_start, blks_size, grp_size;
 172         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 173
 174         if (mmc == NULL) {
 175                 error("invalid mmc device");
 176                 fastboot_fail(response_str, "invalid mmc device");
 177                 return;
 178         }
 179
 180         /* initialize the response buffer */
 181         response_str = response;
 182
 183         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 184         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 185                 error("invalid mmc device");
 186                 fastboot_fail(response_str, "invalid mmc device");
 187                 return;
 188         }
 189
 190         ret = part_get_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 191         if (ret) {
 192                 error("cannot find partition: '%s'", cmd);
 193                 fastboot_fail(response_str, "cannot find partition");
 194                 return;
 195         }
 196
 197         /* Align blocks to erase group size to avoid erasing other partitions */
 198         grp_size = mmc->erase_grp_size;
 199         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 200         if (info.size >= grp_size)
 201                 blks_size = (info.size - (blks_start - info.start)) &
 202                                 (~(grp_size - 1));
 203         else
 204                 blks_size = 0;
 205
 206         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 207                blks_start, blks_start + blks_size);
 208
 209         blks = dev_desc->block_erase(dev_desc, blks_start, blks_size);
 210         if (blks != blks_size) {
 211                 error("failed erasing from device %d", dev_desc->devnum);
 212                 fastboot_fail(response_str, "failed erasing from device");
 213                 return;
 214         }
 215
 216         printf("........ erased " LBAFU " bytes from '%s'\n",
 217                blks_size * info.blksz, cmd);
 218         fastboot_okay(response_str, "");
 219 }