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 char *env_name_spec = "MMC";
  36
  37 #ifdef ENV_IS_EMBEDDED
  38 env_t *env_ptr = &environment;
  39 #else /* ! ENV_IS_EMBEDDED */
  40 env_t *env_ptr;
  41 #endif /* ENV_IS_EMBEDDED */
  42
  43 DECLARE_GLOBAL_DATA_PTR;
  44
  45 #if !defined(CONFIG_ENV_OFFSET)
  46 #define CONFIG_ENV_OFFSET 0
  47 #endif
  48
  49 static int __mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
  50 {
  51         *env_addr = CONFIG_ENV_OFFSET;
  52         return 0;
  53 }
  54 int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
  55         __attribute__((weak, alias("__mmc_get_env_addr")));
  56
  57 int env_init(void)
  58 {
  59         /* use default */
  60         gd->env_addr    = (ulong)&default_environment[0];
  61         gd->env_valid   = 1;
  62
  63         return 0;
  64 }
  65
  66 static int init_mmc_for_env(struct mmc *mmc)
  67 {
  68         if (!mmc) {
  69                 puts("No MMC card found\n");
  70                 return -1;
  71         }
  72
  73         if (mmc_init(mmc)) {
  74                 puts("MMC init failed\n");
  75                 return -1;
  76         }
  77
  78 #ifdef CONFIG_SYS_MMC_ENV_PART
  79         if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num) {
  80                 if (mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
  81                                     CONFIG_SYS_MMC_ENV_PART)) {
  82                         puts("MMC partition switch failed\n");
  83                         return -1;
  84                 }
  85         }
  86 #endif
  87
  88         return 0;
  89 }
  90
  91 static void fini_mmc_for_env(struct mmc *mmc)
  92 {
  93 #ifdef CONFIG_SYS_MMC_ENV_PART
  94         if (CONFIG_SYS_MMC_ENV_PART != mmc->part_num)
  95                 mmc_switch_part(CONFIG_SYS_MMC_ENV_DEV,
  96                                 mmc->part_num);
  97 #endif
  98 }
  99
 100 #ifdef CONFIG_CMD_SAVEENV
 101 static inline int write_env(struct mmc *mmc, unsigned long size,
 102                             unsigned long offset, const void *buffer)
 103 {
 104         uint blk_start, blk_cnt, n;
 105
 106         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
 107         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
 108
 109         n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 110                                         blk_cnt, (u_char *)buffer);
 111
 112         return (n == blk_cnt) ? 0 : -1;
 113 }
 114
 115 int saveenv(void)
 116 {
 117         ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 118         ssize_t len;
 119         char    *res;
 120         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 121         u32     offset;
 122         int     ret;
 123
 124         if (init_mmc_for_env(mmc))
 125                 return 1;
 126
 127         if (mmc_get_env_addr(mmc, &offset)) {
 128                 ret = 1;
 129                 goto fini;
 130         }
 131
 132         res = (char *)&env_new->data;
 133         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 134         if (len < 0) {
 135                 error("Cannot export environment: errno = %d\n", errno);
 136                 ret = 1;
 137                 goto fini;
 138         }
 139
 140         env_new->crc = crc32(0, &env_new->data[0], ENV_SIZE);
 141         printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
 142         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
 143                 puts("failed\n");
 144                 ret = 1;
 145                 goto fini;
 146         }
 147
 148         puts("done\n");
 149         ret = 0;
 150
 151 fini:
 152         fini_mmc_for_env(mmc);
 153         return ret;
 154 }
 155 #endif /* CONFIG_CMD_SAVEENV */
 156
 157 static inline int read_env(struct mmc *mmc, unsigned long size,
 158                            unsigned long offset, const void *buffer)
 159 {
 160         uint blk_start, blk_cnt, n;
 161
 162         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 163         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 164
 165         n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 166                                         blk_cnt, (uchar *)buffer);
 167
 168         return (n == blk_cnt) ? 0 : -1;
 169 }
 170
 171 void env_relocate_spec(void)
 172 {
 173 #if !defined(ENV_IS_EMBEDDED)
 174         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 175         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 176         u32 offset;
 177         int ret;
 178
 179         if (init_mmc_for_env(mmc)) {
 180                 ret = 1;
 181                 goto err;
 182         }
 183
 184         if (mmc_get_env_addr(mmc, &offset)) {
 185                 ret = 1;
 186                 goto fini;
 187         }
 188
 189         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
 190                 ret = 1;
 191                 goto fini;
 192         }
 193
 194         env_import(buf, 1);
 195         ret = 0;
 196
 197 fini:
 198         fini_mmc_for_env(mmc);
 199 err:
 200         if (ret)
 201                 set_default_env(NULL);
 202 #endif
 203 }