common/env_mmc.c

   1 /*
   2  * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 /* #define DEBUG */
  24
  25 #include <common.h>
  26
  27 #include <command.h>
  28 #include <environment.h>
  29 #include <linux/stddef.h>
  30 #include <malloc.h>
  31 #include <mmc.h>
  32 #include <search.h>
  33 #include <errno.h>
  34
  35 /* references to names in env_common.c */
  36 extern uchar default_environment[];
  37
  38 char *env_name_spec = "MMC";
  39
  40 #ifdef ENV_IS_EMBEDDED
  41 extern uchar environment[];
  42 env_t *env_ptr = (env_t *)(&environment[0]);
  43 #else /* ! ENV_IS_EMBEDDED */
  44 env_t *env_ptr = NULL;
  45 #endif /* ENV_IS_EMBEDDED */
  46
  47 /* local functions */
  48 #if !defined(ENV_IS_EMBEDDED)
  49 static void use_default(void);
  50 #endif
  51
  52 DECLARE_GLOBAL_DATA_PTR;
  53
  54 #if !defined(CONFIG_ENV_OFFSET)
  55 #define CONFIG_ENV_OFFSET 0
  56 #endif
  57
  58 static int __mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
  59 {
  60         *env_addr = CONFIG_ENV_OFFSET;
  61         return 0;
  62 }
  63 __attribute__((weak, alias("__mmc_get_env_addr")))
  64 int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr);
  65
  66
  67 uchar env_get_char_spec(int index)
  68 {
  69         return *((uchar *)(gd->env_addr + index));
  70 }
  71
  72 int env_init(void)
  73 {
  74         /* use default */
  75         gd->env_addr = (ulong)&default_environment[0];
  76         gd->env_valid = 1;
  77
  78         return 0;
  79 }
  80
  81 int init_mmc_for_env(struct mmc *mmc)
  82 {
  83         if (!mmc) {
  84                 puts("No MMC card found\n");
  85                 return -1;
  86         }
  87
  88         if (mmc_init(mmc)) {
  89                 puts("MMC init failed\n");
  90                 return  -1;
  91         }
  92
  93         return 0;
  94 }
  95
  96 #ifdef CONFIG_CMD_SAVEENV
  97
  98 inline int write_env(struct mmc *mmc, unsigned long size,
  99                         unsigned long offset, const void *buffer)
 100 {
 101         uint blk_start, blk_cnt, n;
 102
 103         blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 104         blk_cnt   = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 105
 106         n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 107                                         blk_cnt, (u_char *)buffer);
 108
 109         return (n == blk_cnt) ? 0 : -1;
 110 }
 111
 112 int saveenv(void)
 113 {
 114         env_t   env_new;
 115         ssize_t len;
 116         char    *res;
 117         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 118         u32 offset;
 119
 120         if (init_mmc_for_env(mmc))
 121                 return 1;
 122
 123         if(mmc_get_env_addr(mmc, &offset))
 124                 return 1;
 125
 126         res = (char *)&env_new.data;
 127         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
 128         if (len < 0) {
 129                 error("Cannot export environment: errno = %d\n", errno);
 130                 return 1;
 131         }
 132         env_new.crc   = crc32(0, env_new.data, ENV_SIZE);
 133         printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
 134         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)&env_new)) {
 135                 puts("failed\n");
 136                 return 1;
 137         }
 138
 139         puts("done\n");
 140         return 0;
 141 }
 142 #endif /* CONFIG_CMD_SAVEENV */
 143
 144 inline int read_env(struct mmc *mmc, unsigned long size,
 145                         unsigned long offset, const void *buffer)
 146 {
 147         uint blk_start, blk_cnt, n;
 148
 149         blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 150         blk_cnt   = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 151
 152         n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 153                                         blk_cnt, (uchar *)buffer);
 154
 155         return (n == blk_cnt) ? 0 : -1;
 156 }
 157
 158 void env_relocate_spec(void)
 159 {
 160 #if !defined(ENV_IS_EMBEDDED)
 161         char buf[CONFIG_ENV_SIZE];
 162
 163         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 164         u32 offset;
 165
 166         if (init_mmc_for_env(mmc)) {
 167                 use_default();
 168                 return;
 169         }
 170
 171         if(mmc_get_env_addr(mmc, &offset)) {
 172                 use_default();
 173                 return ;
 174         }
 175
 176         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 177                 use_default();
 178                 return;
 179         }
 180
 181         env_import(buf, 1);
 182 #endif
 183 }
 184
 185 #if !defined(ENV_IS_EMBEDDED)
 186 static void use_default()
 187 {
 188         set_default_env(NULL);
 189 }
 190 #endif