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
[CONFIG_ENV_SIZE
];
86 unsigned int off
= CONFIG_ENV_OFFSET
;
88 #ifdef CONFIG_ENV_OFFSET_REDUND
89 if (gd
->env_valid
== 2)
90 off
= CONFIG_ENV_OFFSET_REDUND
;
92 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
93 off
, (uchar
*)buf
, CONFIG_ENV_SIZE
);
104 unsigned int off
= CONFIG_ENV_OFFSET
;
105 #ifdef CONFIG_ENV_OFFSET_REDUND
106 unsigned int off_red
= CONFIG_ENV_OFFSET_REDUND
;
107 char flag_obsolete
= OBSOLETE_FLAG
;
110 BUG_ON(env_ptr
!= NULL
);
112 res
= (char *)&env_new
.data
;
113 len
= hexport_r(&env_htab
, '\0', 0, &res
, ENV_SIZE
, 0, NULL
);
115 error("Cannot export environment: errno = %d\n", errno
);
118 env_new
.crc
= crc32(0, env_new
.data
, ENV_SIZE
);
120 #ifdef CONFIG_ENV_OFFSET_REDUND
121 if (gd
->env_valid
== 1) {
122 off
= CONFIG_ENV_OFFSET_REDUND
;
123 off_red
= CONFIG_ENV_OFFSET
;
126 env_new
.flags
= ACTIVE_FLAG
;
129 rc
= eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
130 off
, (uchar
*)&env_new
, CONFIG_ENV_SIZE
);
132 #ifdef CONFIG_ENV_OFFSET_REDUND
134 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
135 off_red
+ offsetof(env_t
, flags
),
136 (uchar
*)&flag_obsolete
, 1);
138 if (gd
->env_valid
== 1)
148 * Initialize Environment use
150 * We are still running from ROM, so data use is limited.
151 * Use a (moderately small) buffer on the stack
153 #ifdef CONFIG_ENV_OFFSET_REDUND
156 ulong len
, crc
[2], crc_tmp
;
157 unsigned int off
, off_env
[2];
158 uchar buf
[64], flags
[2];
159 int i
, crc_ok
[2] = {0, 0};
161 eeprom_init(); /* prepare for EEPROM read/write */
163 off_env
[0] = CONFIG_ENV_OFFSET
;
164 off_env
[1] = CONFIG_ENV_OFFSET_REDUND
;
166 for (i
= 0; i
< 2; i
++) {
168 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
169 off_env
[i
] + offsetof(env_t
, crc
),
170 (uchar
*)&crc
[i
], sizeof(ulong
));
172 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
173 off_env
[i
] + offsetof(env_t
, flags
),
174 (uchar
*)&flags
[i
], sizeof(uchar
));
178 off
= off_env
[i
] + offsetof(env_t
, data
);
180 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
182 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
, off
,
185 crc_tmp
= crc32(crc_tmp
, buf
, n
);
190 if (crc_tmp
== crc
[i
])
194 if (!crc_ok
[0] && !crc_ok
[1]) {
199 } else if (crc_ok
[0] && !crc_ok
[1]) {
201 } else if (!crc_ok
[0] && crc_ok
[1]) {
204 /* both ok - check serial */
205 if (flags
[0] == ACTIVE_FLAG
&& flags
[1] == OBSOLETE_FLAG
)
207 else if (flags
[0] == OBSOLETE_FLAG
&& flags
[1] == ACTIVE_FLAG
)
209 else if (flags
[0] == 0xFF && flags
[1] == 0)
211 else if (flags
[1] == 0xFF && flags
[0] == 0)
213 else /* flags are equal - almost impossible */
217 if (gd
->env_valid
== 2)
218 gd
->env_addr
= off_env
[1] + offsetof(env_t
, data
);
219 else if (gd
->env_valid
== 1)
220 gd
->env_addr
= off_env
[0] + offsetof(env_t
, data
);
231 eeprom_init(); /* prepare for EEPROM read/write */
234 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
235 CONFIG_ENV_OFFSET
+ offsetof(env_t
, crc
),
236 (uchar
*)&crc
, sizeof(ulong
));
240 off
= offsetof(env_t
, data
);
243 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
245 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
246 CONFIG_ENV_OFFSET
+ off
, buf
, n
);
247 new = crc32(new, buf
, n
);
253 gd
->env_addr
= offsetof(env_t
, data
);