2 * (C) Copyright 2000-2010
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6 * Andreas Heppel <aheppel@sysgo.de>
8 * SPDX-License-Identifier: GPL-2.0+
13 #include <environment.h>
14 #include <linux/stddef.h>
15 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
20 #include <linux/compiler.h> /* for BUG_ON */
22 DECLARE_GLOBAL_DATA_PTR
;
26 char *env_name_spec
= "EEPROM";
27 int env_eeprom_bus
= -1;
29 static int eeprom_bus_read(unsigned dev_addr
, unsigned offset
,
30 uchar
*buffer
, unsigned cnt
)
33 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
34 int old_bus
= i2c_get_bus_num();
36 if (old_bus
!= CONFIG_I2C_ENV_EEPROM_BUS
)
37 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS
);
40 rcode
= eeprom_read(dev_addr
, offset
, buffer
, cnt
);
42 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
43 if (old_bus
!= env_eeprom_bus
)
44 i2c_set_bus_num(old_bus
);
50 static int eeprom_bus_write(unsigned dev_addr
, unsigned offset
,
51 uchar
*buffer
, unsigned cnt
)
54 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
55 int old_bus
= i2c_get_bus_num();
57 if (old_bus
!= CONFIG_I2C_ENV_EEPROM_BUS
)
58 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS
);
61 rcode
= eeprom_write(dev_addr
, offset
, buffer
, cnt
);
63 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
64 i2c_set_bus_num(old_bus
);
69 uchar
env_get_char_spec(int index
)
72 unsigned int off
= CONFIG_ENV_OFFSET
;
74 #ifdef CONFIG_ENV_OFFSET_REDUND
75 if (gd
->env_valid
== 2)
76 off
= CONFIG_ENV_OFFSET_REDUND
;
78 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
79 off
+ index
+ offsetof(env_t
, data
), &c
, 1);
84 void env_relocate_spec(void)
86 char buf
[CONFIG_ENV_SIZE
];
87 unsigned int off
= CONFIG_ENV_OFFSET
;
89 #ifdef CONFIG_ENV_OFFSET_REDUND
90 if (gd
->env_valid
== 2)
91 off
= CONFIG_ENV_OFFSET_REDUND
;
93 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
94 off
, (uchar
*)buf
, CONFIG_ENV_SIZE
);
105 unsigned int off
= CONFIG_ENV_OFFSET
;
106 #ifdef CONFIG_ENV_OFFSET_REDUND
107 unsigned int off_red
= CONFIG_ENV_OFFSET_REDUND
;
108 char flag_obsolete
= OBSOLETE_FLAG
;
111 BUG_ON(env_ptr
!= NULL
);
113 res
= (char *)&env_new
.data
;
114 len
= hexport_r(&env_htab
, '\0', 0, &res
, ENV_SIZE
, 0, NULL
);
116 error("Cannot export environment: errno = %d\n", errno
);
119 env_new
.crc
= crc32(0, env_new
.data
, ENV_SIZE
);
121 #ifdef CONFIG_ENV_OFFSET_REDUND
122 if (gd
->env_valid
== 1) {
123 off
= CONFIG_ENV_OFFSET_REDUND
;
124 off_red
= CONFIG_ENV_OFFSET
;
127 env_new
.flags
= ACTIVE_FLAG
;
130 rc
= eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
131 off
, (uchar
*)&env_new
, CONFIG_ENV_SIZE
);
133 #ifdef CONFIG_ENV_OFFSET_REDUND
135 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
136 off_red
+ offsetof(env_t
, flags
),
137 (uchar
*)&flag_obsolete
, 1);
139 if (gd
->env_valid
== 1)
149 * Initialize Environment use
151 * We are still running from ROM, so data use is limited.
152 * Use a (moderately small) buffer on the stack
154 #ifdef CONFIG_ENV_OFFSET_REDUND
157 ulong len
, crc
[2], crc_tmp
;
158 unsigned int off
, off_env
[2];
159 uchar buf
[64], flags
[2];
160 int i
, crc_ok
[2] = {0, 0};
162 eeprom_init(); /* prepare for EEPROM read/write */
164 off_env
[0] = CONFIG_ENV_OFFSET
;
165 off_env
[1] = CONFIG_ENV_OFFSET_REDUND
;
167 for (i
= 0; i
< 2; i
++) {
169 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
170 off_env
[i
] + offsetof(env_t
, crc
),
171 (uchar
*)&crc
[i
], sizeof(ulong
));
173 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
174 off_env
[i
] + offsetof(env_t
, flags
),
175 (uchar
*)&flags
[i
], sizeof(uchar
));
179 off
= off_env
[i
] + offsetof(env_t
, data
);
181 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
183 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
, off
,
186 crc_tmp
= crc32(crc_tmp
, buf
, n
);
191 if (crc_tmp
== crc
[i
])
195 if (!crc_ok
[0] && !crc_ok
[1]) {
200 } else if (crc_ok
[0] && !crc_ok
[1]) {
202 } else if (!crc_ok
[0] && crc_ok
[1]) {
205 /* both ok - check serial */
206 if (flags
[0] == ACTIVE_FLAG
&& flags
[1] == OBSOLETE_FLAG
)
208 else if (flags
[0] == OBSOLETE_FLAG
&& flags
[1] == ACTIVE_FLAG
)
210 else if (flags
[0] == 0xFF && flags
[1] == 0)
212 else if (flags
[1] == 0xFF && flags
[0] == 0)
214 else /* flags are equal - almost impossible */
218 if (gd
->env_valid
== 2)
219 gd
->env_addr
= off_env
[1] + offsetof(env_t
, data
);
220 else if (gd
->env_valid
== 1)
221 gd
->env_addr
= off_env
[0] + offsetof(env_t
, data
);
232 eeprom_init(); /* prepare for EEPROM read/write */
235 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
236 CONFIG_ENV_OFFSET
+ offsetof(env_t
, crc
),
237 (uchar
*)&crc
, sizeof(ulong
));
241 off
= offsetof(env_t
, data
);
244 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
246 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
247 CONFIG_ENV_OFFSET
+ off
, buf
, n
);
248 new = crc32(new, buf
, n
);
254 gd
->env_addr
= offsetof(env_t
, data
);