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 <fb_mmc.h>
  10 #include <part.h>
  11 #include <aboot.h>
  12 #include <sparse_format.h>
  13 #include <mmc.h>
  14
  15 #ifndef CONFIG_FASTBOOT_GPT_NAME
  16 #define CONFIG_FASTBOOT_GPT_NAME GPT_ENTRY_NAME
  17 #endif
  18
  19 /* The 64 defined bytes plus the '\0' */
  20 #define RESPONSE_LEN    (64 + 1)
  21
  22 static char *response_str;
  23
  24 void fastboot_fail(const char *s)
  25 {
  26         strncpy(response_str, "FAIL\0", 5);
  27         strncat(response_str, s, RESPONSE_LEN - 4 - 1);
  28 }
  29
  30 void fastboot_okay(const char *s)
  31 {
  32         strncpy(response_str, "OKAY\0", 5);
  33         strncat(response_str, s, RESPONSE_LEN - 4 - 1);
  34 }
  35
  36 static int get_partition_info_efi_by_name_or_alias(block_dev_desc_t *dev_desc,
  37                 const char *name, disk_partition_t *info)
  38 {
  39         int ret;
  40
  41         ret = get_partition_info_efi_by_name(dev_desc, name, info);
  42         if (ret) {
  43                 /* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
  44                 char env_alias_name[25 + 32 + 1];
  45                 char *aliased_part_name;
  46
  47                 /* check for alias */
  48                 strcpy(env_alias_name, "fastboot_partition_alias_");
  49                 strncat(env_alias_name, name, 32);
  50                 aliased_part_name = getenv(env_alias_name);
  51                 if (aliased_part_name != NULL)
  52                         ret = get_partition_info_efi_by_name(dev_desc,
  53                                         aliased_part_name, info);
  54         }
  55         return ret;
  56 }
  57
  58 static void write_raw_image(block_dev_desc_t *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 = blkcnt / info->blksz;
  68
  69         if (blkcnt > info->size) {
  70                 error("too large for partition: '%s'\n", part_name);
  71                 fastboot_fail("too large for partition");
  72                 return;
  73         }
  74
  75         puts("Flashing Raw Image\n");
  76
  77         blks = dev_desc->block_write(dev_desc->dev, info->start, blkcnt,
  78                                      buffer);
  79         if (blks != blkcnt) {
  80                 error("failed writing to device %d\n", dev_desc->dev);
  81                 fastboot_fail("failed writing to device");
  82                 return;
  83         }
  84
  85         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
  86                part_name);
  87         fastboot_okay("");
  88 }
  89
  90 void fb_mmc_flash_write(const char *cmd, void *download_buffer,
  91                         unsigned int download_bytes, char *response)
  92 {
  93         block_dev_desc_t *dev_desc;
  94         disk_partition_t info;
  95
  96         /* initialize the response buffer */
  97         response_str = response;
  98
  99         dev_desc = 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("writing GPT partitions failed");
 118                         return;
 119                 }
 120                 printf("........ success\n");
 121                 fastboot_okay("");
 122                 return;
 123         } else if (get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info)) {
 124                 error("cannot find partition: '%s'\n", cmd);
 125                 fastboot_fail("cannot find partition");
 126                 return;
 127         }
 128
 129         if (is_sparse_image(download_buffer))
 130                 write_sparse_image(dev_desc, &info, cmd, download_buffer,
 131                                    download_bytes);
 132         else
 133                 write_raw_image(dev_desc, &info, cmd, download_buffer,
 134                                 download_bytes);
 135 }
 136
 137 void fb_mmc_erase(const char *cmd, char *response)
 138 {
 139         int ret;
 140         block_dev_desc_t *dev_desc;
 141         disk_partition_t info;
 142         lbaint_t blks, blks_start, blks_size, grp_size;
 143         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
 144
 145         if (mmc == NULL) {
 146                 error("invalid mmc device");
 147                 fastboot_fail("invalid mmc device");
 148                 return;
 149         }
 150
 151         /* initialize the response buffer */
 152         response_str = response;
 153
 154         dev_desc = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
 155         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
 156                 error("invalid mmc device");
 157                 fastboot_fail("invalid mmc device");
 158                 return;
 159         }
 160
 161         ret = get_partition_info_efi_by_name_or_alias(dev_desc, cmd, &info);
 162         if (ret) {
 163                 error("cannot find partition: '%s'", cmd);
 164                 fastboot_fail("cannot find partition");
 165                 return;
 166         }
 167
 168         /* Align blocks to erase group size to avoid erasing other partitions */
 169         grp_size = mmc->erase_grp_size;
 170         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
 171         if (info.size >= grp_size)
 172                 blks_size = (info.size - (blks_start - info.start)) &
 173                                 (~(grp_size - 1));
 174         else
 175                 blks_size = 0;
 176
 177         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
 178                blks_start, blks_start + blks_size);
 179
 180         blks = dev_desc->block_erase(dev_desc->dev, blks_start, blks_size);
 181         if (blks != blks_size) {
 182                 error("failed erasing from device %d", dev_desc->dev);
 183                 fastboot_fail("failed erasing from device");
 184                 return;
 185         }
 186
 187         printf("........ erased " LBAFU " bytes from '%s'\n",
 188                blks_size * info.blksz, cmd);
 189         fastboot_okay("");
 190 }