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";
28 static int eeprom_bus_read(unsigned dev_addr
, unsigned offset
,
29 uchar
*buffer
, unsigned cnt
)
32 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
33 int old_bus
= i2c_get_bus_num();
35 if (old_bus
!= CONFIG_I2C_ENV_EEPROM_BUS
)
36 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS
);
39 rcode
= eeprom_read(dev_addr
, offset
, buffer
, cnt
);
41 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
42 i2c_set_bus_num(old_bus
);
48 static int eeprom_bus_write(unsigned dev_addr
, unsigned offset
,
49 uchar
*buffer
, unsigned cnt
)
52 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
53 int old_bus
= i2c_get_bus_num();
55 if (old_bus
!= CONFIG_I2C_ENV_EEPROM_BUS
)
56 i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS
);
59 rcode
= eeprom_write(dev_addr
, offset
, buffer
, cnt
);
61 #if defined(CONFIG_I2C_ENV_EEPROM_BUS)
62 i2c_set_bus_num(old_bus
);
68 uchar
env_get_char_spec(int index
)
71 unsigned int off
= CONFIG_ENV_OFFSET
;
73 #ifdef CONFIG_ENV_OFFSET_REDUND
74 if (gd
->env_valid
== 2)
75 off
= CONFIG_ENV_OFFSET_REDUND
;
77 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
78 off
+ index
+ offsetof(env_t
, data
), &c
, 1);
83 void env_relocate_spec(void)
85 char buf_env
[CONFIG_ENV_SIZE
];
86 unsigned int off
= CONFIG_ENV_OFFSET
;
88 #ifdef CONFIG_ENV_OFFSET_REDUND
89 ulong len
, crc
[2], crc_tmp
;
90 unsigned int off_env
[2];
91 uchar rdbuf
[64], flags
[2];
92 int i
, crc_ok
[2] = {0, 0};
94 eeprom_init(); /* prepare for EEPROM read/write */
96 off_env
[0] = CONFIG_ENV_OFFSET
;
97 off_env
[1] = CONFIG_ENV_OFFSET_REDUND
;
99 for (i
= 0; i
< 2; i
++) {
101 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
102 off_env
[i
] + offsetof(env_t
, crc
),
103 (uchar
*)&crc
[i
], sizeof(ulong
));
105 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
106 off_env
[i
] + offsetof(env_t
, flags
),
107 (uchar
*)&flags
[i
], sizeof(uchar
));
111 off
= off_env
[i
] + offsetof(env_t
, data
);
113 int n
= (len
> sizeof(rdbuf
)) ? sizeof(rdbuf
) : len
;
115 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
, off
,
118 crc_tmp
= crc32(crc_tmp
, rdbuf
, n
);
123 if (crc_tmp
== crc
[i
])
127 if (!crc_ok
[0] && !crc_ok
[1]) {
130 } else if (crc_ok
[0] && !crc_ok
[1]) {
132 } else if (!crc_ok
[0] && crc_ok
[1]) {
135 /* both ok - check serial */
136 if (flags
[0] == ACTIVE_FLAG
&& flags
[1] == OBSOLETE_FLAG
)
138 else if (flags
[0] == OBSOLETE_FLAG
&& flags
[1] == ACTIVE_FLAG
)
140 else if (flags
[0] == 0xFF && flags
[1] == 0)
142 else if (flags
[1] == 0xFF && flags
[0] == 0)
144 else /* flags are equal - almost impossible */
148 if (gd
->env_valid
== 2)
149 gd
->env_addr
= off_env
[1] + offsetof(env_t
, data
);
150 else if (gd
->env_valid
== 1)
151 gd
->env_addr
= off_env
[0] + offsetof(env_t
, data
);
153 #else /* CONFIG_ENV_OFFSET_REDUND */
157 eeprom_init(); /* prepare for EEPROM read/write */
160 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
161 CONFIG_ENV_OFFSET
+ offsetof(env_t
, crc
),
162 (uchar
*)&crc
, sizeof(ulong
));
166 off
= offsetof(env_t
, data
);
168 int n
= (len
> sizeof(rdbuf
)) ? sizeof(rdbuf
) : len
;
170 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
171 CONFIG_ENV_OFFSET
+ off
, rdbuf
, n
);
172 new = crc32(new, rdbuf
, n
);
178 gd
->env_addr
= offsetof(env_t
, data
);
184 #endif /* CONFIG_ENV_OFFSET_REDUND */
186 off
= CONFIG_ENV_OFFSET
;
187 #ifdef CONFIG_ENV_OFFSET_REDUND
188 if (gd
->env_valid
== 2)
189 off
= CONFIG_ENV_OFFSET_REDUND
;
192 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
193 off
, (uchar
*)buf_env
, CONFIG_ENV_SIZE
);
195 env_import(buf_env
, 1);
202 unsigned int off
= CONFIG_ENV_OFFSET
;
203 #ifdef CONFIG_ENV_OFFSET_REDUND
204 unsigned int off_red
= CONFIG_ENV_OFFSET_REDUND
;
205 char flag_obsolete
= OBSOLETE_FLAG
;
208 BUG_ON(env_ptr
!= NULL
);
210 rc
= env_export(&env_new
);
214 #ifdef CONFIG_ENV_OFFSET_REDUND
215 if (gd
->env_valid
== 1) {
216 off
= CONFIG_ENV_OFFSET_REDUND
;
217 off_red
= CONFIG_ENV_OFFSET
;
220 env_new
.flags
= ACTIVE_FLAG
;
223 rc
= eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
224 off
, (uchar
*)&env_new
, CONFIG_ENV_SIZE
);
226 #ifdef CONFIG_ENV_OFFSET_REDUND
228 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
229 off_red
+ offsetof(env_t
, flags
),
230 (uchar
*)&flag_obsolete
, 1);
232 if (gd
->env_valid
== 1)
242 * Initialize Environment use
244 * We are still running from ROM, so data use is limited.
245 * Use a (moderately small) buffer on the stack
249 gd
->env_addr
= (ulong
)&default_environment
[0];