2 * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
4 * See file CREDITS for list of people who contributed to this
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.
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.
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,
28 #include <environment.h>
29 #include <linux/stddef.h>
35 /* references to names in env_common.c */
36 extern uchar default_environment
[];
38 char *env_name_spec
= "MMC";
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 */
48 #if !defined(ENV_IS_EMBEDDED)
49 static void use_default(void);
52 DECLARE_GLOBAL_DATA_PTR
;
54 #if !defined(CONFIG_ENV_OFFSET)
55 #define CONFIG_ENV_OFFSET 0
58 static int __mmc_get_env_addr(struct mmc
*mmc
, u32
*env_addr
)
60 *env_addr
= CONFIG_ENV_OFFSET
;
63 __attribute__((weak
, alias("__mmc_get_env_addr")))
64 int mmc_get_env_addr(struct mmc
*mmc
, u32
*env_addr
);
67 uchar
env_get_char_spec(int index
)
69 return *((uchar
*)(gd
->env_addr
+ index
));
75 gd
->env_addr
= (ulong
)&default_environment
[0];
81 int init_mmc_for_env(struct mmc
*mmc
)
84 puts("No MMC card found\n");
89 puts("MMC init failed\n");
96 #ifdef CONFIG_CMD_SAVEENV
98 inline int write_env(struct mmc
*mmc
, unsigned long size
,
99 unsigned long offset
, const void *buffer
)
101 uint blk_start
, blk_cnt
, n
;
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
;
106 n
= mmc
->block_dev
.block_write(CONFIG_SYS_MMC_ENV_DEV
, blk_start
,
107 blk_cnt
, (u_char
*)buffer
);
109 return (n
== blk_cnt
) ? 0 : -1;
117 struct mmc
*mmc
= find_mmc_device(CONFIG_SYS_MMC_ENV_DEV
);
120 if (init_mmc_for_env(mmc
))
123 if(mmc_get_env_addr(mmc
, &offset
))
126 res
= (char *)&env_new
.data
;
127 len
= hexport_r(&env_htab
, '\0', &res
, ENV_SIZE
);
129 error("Cannot export environment: errno = %d\n", errno
);
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
)) {
142 #endif /* CONFIG_CMD_SAVEENV */
144 inline int read_env(struct mmc
*mmc
, unsigned long size
,
145 unsigned long offset
, const void *buffer
)
147 uint blk_start
, blk_cnt
, n
;
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
;
152 n
= mmc
->block_dev
.block_read(CONFIG_SYS_MMC_ENV_DEV
, blk_start
,
153 blk_cnt
, (uchar
*)buffer
);
155 return (n
== blk_cnt
) ? 0 : -1;
158 void env_relocate_spec(void)
160 #if !defined(ENV_IS_EMBEDDED)
161 char buf
[CONFIG_ENV_SIZE
];
163 struct mmc
*mmc
= find_mmc_device(CONFIG_SYS_MMC_ENV_DEV
);
166 if (init_mmc_for_env(mmc
)) {
171 if(mmc_get_env_addr(mmc
, &offset
)) {
176 if (read_env(mmc
, CONFIG_ENV_SIZE
, offset
, buf
)) {
185 #if !defined(ENV_IS_EMBEDDED)
186 static void use_default()
188 set_default_env(NULL
);