common/env_fat.c

   1 /*
   2  * (c) Copyright 2011 by Tigris Elektronik GmbH
   3  *
   4  * Author:
   5  *  Maximilian Schwerin <mvs@tigris.de>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11
  12 #include <command.h>
  13 #include <environment.h>
  14 #include <linux/stddef.h>
  15 #include <malloc.h>
  16 #include <search.h>
  17 #include <errno.h>
  18 #include <fat.h>
  19 #include <mmc.h>
  20
  21 char *env_name_spec = "FAT";
  22
  23 env_t *env_ptr;
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 int env_init(void)
  28 {
  29         /* use default */
  30         gd->env_addr = (ulong)&default_environment[0];
  31         gd->env_valid = 1;
  32
  33         return 0;
  34 }
  35
  36 #ifdef CONFIG_CMD_SAVEENV
  37 int saveenv(void)
  38 {
  39         env_t   env_new;
  40         ssize_t len;
  41         char    *res;
  42         block_dev_desc_t *dev_desc = NULL;
  43         int dev = FAT_ENV_DEVICE;
  44         int part = FAT_ENV_PART;
  45         int err;
  46
  47         res = (char *)&env_new.data;
  48         len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
  49         if (len < 0) {
  50                 error("Cannot export environment: errno = %d\n", errno);
  51                 return 1;
  52         }
  53
  54 #ifdef CONFIG_MMC
  55         if (strcmp(FAT_ENV_INTERFACE, "mmc") == 0) {
  56                 struct mmc *mmc = find_mmc_device(dev);
  57
  58                 if (!mmc) {
  59                         printf("no mmc device at slot %x\n", dev);
  60                         return 1;
  61                 }
  62
  63                 mmc->has_init = 0;
  64                 mmc_init(mmc);
  65         }
  66 #endif /* CONFIG_MMC */
  67
  68         dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
  69         if (dev_desc == NULL) {
  70                 printf("Failed to find %s%d\n",
  71                         FAT_ENV_INTERFACE, dev);
  72                 return 1;
  73         }
  74
  75         err = fat_register_device(dev_desc, part);
  76         if (err) {
  77                 printf("Failed to register %s%d:%d\n",
  78                         FAT_ENV_INTERFACE, dev, part);
  79                 return 1;
  80         }
  81
  82         env_new.crc = crc32(0, env_new.data, ENV_SIZE);
  83         err = file_fat_write(FAT_ENV_FILE, (void *)&env_new, sizeof(env_t));
  84         if (err == -1) {
  85                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  86                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
  87                 return 1;
  88         }
  89
  90         puts("done\n");
  91         return 0;
  92 }
  93 #endif /* CONFIG_CMD_SAVEENV */
  94
  95 void env_relocate_spec(void)
  96 {
  97         char buf[CONFIG_ENV_SIZE];
  98         block_dev_desc_t *dev_desc = NULL;
  99         int dev = FAT_ENV_DEVICE;
 100         int part = FAT_ENV_PART;
 101         int err;
 102
 103 #ifdef CONFIG_MMC
 104         if (strcmp(FAT_ENV_INTERFACE, "mmc") == 0) {
 105                 struct mmc *mmc = find_mmc_device(dev);
 106
 107                 if (!mmc) {
 108                         printf("no mmc device at slot %x\n", dev);
 109                         set_default_env(NULL);
 110                         return;
 111                 }
 112
 113                 mmc->has_init = 0;
 114                 mmc_init(mmc);
 115         }
 116 #endif /* CONFIG_MMC */
 117
 118         dev_desc = get_dev(FAT_ENV_INTERFACE, dev);
 119         if (dev_desc == NULL) {
 120                 printf("Failed to find %s%d\n",
 121                         FAT_ENV_INTERFACE, dev);
 122                 set_default_env(NULL);
 123                 return;
 124         }
 125
 126         err = fat_register_device(dev_desc, part);
 127         if (err) {
 128                 printf("Failed to register %s%d:%d\n",
 129                         FAT_ENV_INTERFACE, dev, part);
 130                 set_default_env(NULL);
 131                 return;
 132         }
 133
 134         err = file_fat_read(FAT_ENV_FILE, (uchar *)&buf, CONFIG_ENV_SIZE);
 135         if (err == -1) {
 136                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 137                         FAT_ENV_FILE, FAT_ENV_INTERFACE, dev, part);
 138                 set_default_env(NULL);
 139                 return;
 140         }
 141
 142         env_import(buf, 1);
 143 }