1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/*
* (C) Copyright 2000-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
#include <i2c.h>
#endif
#include <search.h>
#include <errno.h>
#include <linux/compiler.h> /* for BUG_ON */
DECLARE_GLOBAL_DATA_PTR;
static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
uchar *buffer, unsigned cnt)
{
int rcode;
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
int old_bus = i2c_get_bus_num();
if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
#endif
rcode = eeprom_read(dev_addr, offset, buffer, cnt);
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
i2c_set_bus_num(old_bus);
#endif
return rcode;
}
static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
uchar *buffer, unsigned cnt)
{
int rcode;
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
int old_bus = i2c_get_bus_num();
if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
#endif
rcode = eeprom_write(dev_addr, offset, buffer, cnt);
#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
i2c_set_bus_num(old_bus);
#endif
return rcode;
}
static int env_eeprom_get_char(int index)
{
uchar c;
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == ENV_REDUND)
off = CONFIG_ENV_OFFSET_REDUND;
#endif
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off + index + offsetof(env_t, data), &c, 1);
return c;
}
static int env_eeprom_load(void)
{
char buf_env[CONFIG_ENV_SIZE];
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
ulong len, crc[2], crc_tmp;
unsigned int off_env[2];
uchar rdbuf[64], flags[2];
int i, crc_ok[2] = {0, 0};
eeprom_init(-1); /* prepare for EEPROM read/write */
off_env[0] = CONFIG_ENV_OFFSET;
off_env[1] = CONFIG_ENV_OFFSET_REDUND;
for (i = 0; i < 2; i++) {
/* read CRC */
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off_env[i] + offsetof(env_t, crc),
(uchar *)&crc[i], sizeof(ulong));
/* read FLAGS */
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off_env[i] + offsetof(env_t, flags),
(uchar *)&flags[i], sizeof(uchar));
crc_tmp = 0;
len = ENV_SIZE;
off = off_env[i] + offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
rdbuf, n);
crc_tmp = crc32(crc_tmp, rdbuf, n);
len -= n;
off += n;
}
if (crc_tmp == crc[i])
crc_ok[i] = 1;
}
if (!crc_ok[0] && !crc_ok[1]) {
gd->env_addr = 0;
gd->env_valid = ENV_INVALID;
} else if (crc_ok[0] && !crc_ok[1]) {
gd->env_valid = ENV_VALID;
} else if (!crc_ok[0] && crc_ok[1]) {
gd->env_valid = ENV_REDUND;
} else {
/* both ok - check serial */
if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
gd->env_valid = ENV_VALID;
else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
gd->env_valid = ENV_REDUND;
else if (flags[0] == 0xFF && flags[1] == 0)
gd->env_valid = ENV_REDUND;
else if (flags[1] == 0xFF && flags[0] == 0)
gd->env_valid = ENV_VALID;
else /* flags are equal - almost impossible */
gd->env_valid = ENV_VALID;
}
#else /* CONFIG_ENV_OFFSET_REDUND */
ulong crc, len, new;
uchar rdbuf[64];
eeprom_init(-1); /* prepare for EEPROM read/write */
/* read old CRC */
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
CONFIG_ENV_OFFSET + offsetof(env_t, crc),
(uchar *)&crc, sizeof(ulong));
new = 0;
len = ENV_SIZE;
off = offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
CONFIG_ENV_OFFSET + off, rdbuf, n);
new = crc32(new, rdbuf, n);
len -= n;
off += n;
}
if (crc == new) {
gd->env_valid = ENV_VALID;
} else {
gd->env_valid = ENV_INVALID;
}
#endif /* CONFIG_ENV_OFFSET_REDUND */
off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == ENV_REDUND)
off = CONFIG_ENV_OFFSET_REDUND;
#endif
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off, (uchar *)buf_env, CONFIG_ENV_SIZE);
return env_import(buf_env, 1);
}
static int env_eeprom_save(void)
{
env_t env_new;
int rc;
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
unsigned int off_red = CONFIG_ENV_OFFSET_REDUND;
char flag_obsolete = OBSOLETE_FLAG;
#endif
rc = env_export(&env_new);
if (rc)
return rc;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == ENV_VALID) {
off = CONFIG_ENV_OFFSET_REDUND;
off_red = CONFIG_ENV_OFFSET;
}
env_new.flags = ACTIVE_FLAG;
#endif
rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
off, (uchar *)&env_new, CONFIG_ENV_SIZE);
#ifdef CONFIG_ENV_OFFSET_REDUND
if (rc == 0) {
eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
off_red + offsetof(env_t, flags),
(uchar *)&flag_obsolete, 1);
if (gd->env_valid == ENV_VALID)
gd->env_valid = ENV_REDUND;
else
gd->env_valid = ENV_VALID;
}
#endif
return rc;
}
U_BOOT_ENV_LOCATION(eeprom) = {
.location = ENVL_EEPROM,
ENV_NAME("EEPROM")
.get_char = env_eeprom_get_char,
.load = env_eeprom_load,
.save = env_save_ptr(env_eeprom_save),
};
|
