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 uchar env_get_char_spec(int index)
  58 {
  59         return *((uchar *)(gd->env_addr + index));
  60 }
  61
  62 int env_init(void)
  63 {
  64         /* use default */
  65         gd->env_addr    = (ulong)&default_environment[0];
  66         gd->env_valid   = 1;
  67
  68         return 0;
  69 }
  70
  71 static int init_mmc_for_env(struct mmc *mmc)
  72 {
  73         if (!mmc) {
  74                 puts("No MMC card found\n");
  75                 return -1;
  76         }
  77
  78         if (mmc_init(mmc)) {
  79                 puts("MMC init failed\n");
  80                 return -1;
  81         }
  82
  83         return 0;
  84 }
  85
  86 #ifdef CONFIG_CMD_SAVEENV
  87 static inline int write_env(struct mmc *mmc, unsigned long size,
  88                             unsigned long offset, const void *buffer)
  89 {
  90         uint blk_start, blk_cnt, n;
  91
  92         blk_start       = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
  93         blk_cnt         = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
  94
  95         n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
  96                                         blk_cnt, (u_char *)buffer);
  97
  98         return (n == blk_cnt) ? 0 : -1;
  99 }
 100
 101 int saveenv(void)
 102 {
 103         env_t   env_new;
 104         ssize_t len;
 105         char    *res;
 106         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 107         u32     offset;
 108
 109         if (init_mmc_for_env(mmc) || mmc_get_env_addr(mmc, &offset))
 110                 return 1;
 111
 112         res = (char *)&env_new.data;
 113         len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
 114         if (len < 0) {
 115                 error("Cannot export environment: errno = %d\n", errno);
 116                 return 1;
 117         }
 118
 119         env_new.crc = crc32(0, env_new.data, ENV_SIZE);
 120         printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
 121         if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)&env_new)) {
 122                 puts("failed\n");
 123                 return 1;
 124         }
 125
 126         puts("done\n");
 127         return 0;
 128 }
 129 #endif /* CONFIG_CMD_SAVEENV */
 130
 131 static inline int read_env(struct mmc *mmc, unsigned long size,
 132                            unsigned long offset, const void *buffer)
 133 {
 134         uint blk_start, blk_cnt, n;
 135
 136         blk_start       = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
 137         blk_cnt         = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
 138
 139         n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
 140                                         blk_cnt, (uchar *)buffer);
 141
 142         return (n == blk_cnt) ? 0 : -1;
 143 }
 144
 145 void env_relocate_spec(void)
 146 {
 147 #if !defined(ENV_IS_EMBEDDED)
 148         char buf[CONFIG_ENV_SIZE];
 149         struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
 150         u32 offset;
 151
 152         if (init_mmc_for_env(mmc) || mmc_get_env_addr(mmc, &offset))
 153                 return set_default_env(NULL);
 154
 155         if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf))
 156                 return set_default_env(NULL);
 157
 158         env_import(buf, 1);
 159 #endif
 160 }