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
);
102 unsigned int off
= CONFIG_ENV_OFFSET
;
103 #ifdef CONFIG_ENV_OFFSET_REDUND
104 unsigned int off_red
= CONFIG_ENV_OFFSET_REDUND
;
105 char flag_obsolete
= OBSOLETE_FLAG
;
108 BUG_ON(env_ptr
!= NULL
);
110 rc
= env_export(&env_new
);
114 #ifdef CONFIG_ENV_OFFSET_REDUND
115 if (gd
->env_valid
== 1) {
116 off
= CONFIG_ENV_OFFSET_REDUND
;
117 off_red
= CONFIG_ENV_OFFSET
;
120 env_new
.flags
= ACTIVE_FLAG
;
123 rc
= eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
124 off
, (uchar
*)&env_new
, CONFIG_ENV_SIZE
);
126 #ifdef CONFIG_ENV_OFFSET_REDUND
128 eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR
,
129 off_red
+ offsetof(env_t
, flags
),
130 (uchar
*)&flag_obsolete
, 1);
132 if (gd
->env_valid
== 1)
142 * Initialize Environment use
144 * We are still running from ROM, so data use is limited.
145 * Use a (moderately small) buffer on the stack
147 #ifdef CONFIG_ENV_OFFSET_REDUND
150 #ifdef ENV_IS_EMBEDDED
151 ulong len
, crc
[2], crc_tmp
;
152 unsigned int off
, off_env
[2];
153 uchar buf
[64], flags
[2];
154 int i
, crc_ok
[2] = {0, 0};
156 eeprom_init(); /* prepare for EEPROM read/write */
158 off_env
[0] = CONFIG_ENV_OFFSET
;
159 off_env
[1] = CONFIG_ENV_OFFSET_REDUND
;
161 for (i
= 0; i
< 2; i
++) {
163 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
164 off_env
[i
] + offsetof(env_t
, crc
),
165 (uchar
*)&crc
[i
], sizeof(ulong
));
167 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
168 off_env
[i
] + offsetof(env_t
, flags
),
169 (uchar
*)&flags
[i
], sizeof(uchar
));
173 off
= off_env
[i
] + offsetof(env_t
, data
);
175 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
177 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
, off
,
180 crc_tmp
= crc32(crc_tmp
, buf
, n
);
185 if (crc_tmp
== crc
[i
])
189 if (!crc_ok
[0] && !crc_ok
[1]) {
194 } else if (crc_ok
[0] && !crc_ok
[1]) {
196 } else if (!crc_ok
[0] && crc_ok
[1]) {
199 /* both ok - check serial */
200 if (flags
[0] == ACTIVE_FLAG
&& flags
[1] == OBSOLETE_FLAG
)
202 else if (flags
[0] == OBSOLETE_FLAG
&& flags
[1] == ACTIVE_FLAG
)
204 else if (flags
[0] == 0xFF && flags
[1] == 0)
206 else if (flags
[1] == 0xFF && flags
[0] == 0)
208 else /* flags are equal - almost impossible */
212 if (gd
->env_valid
== 2)
213 gd
->env_addr
= off_env
[1] + offsetof(env_t
, data
);
214 else if (gd
->env_valid
== 1)
215 gd
->env_addr
= off_env
[0] + offsetof(env_t
, data
);
217 gd
->env_addr
= (ulong
)&default_environment
[0];
225 #ifdef ENV_IS_EMBEDDED
230 eeprom_init(); /* prepare for EEPROM read/write */
233 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
234 CONFIG_ENV_OFFSET
+ offsetof(env_t
, crc
),
235 (uchar
*)&crc
, sizeof(ulong
));
239 off
= offsetof(env_t
, data
);
242 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
244 eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR
,
245 CONFIG_ENV_OFFSET
+ off
, buf
, n
);
246 new = crc32(new, buf
, n
);
252 gd
->env_addr
= offsetof(env_t
, data
);
259 gd
->env_addr
= (ulong
)&default_environment
[0];