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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
0bc4a1ac | 2 | /* |
ea882baf | 3 | * (C) Copyright 2000-2010 |
0bc4a1ac WD |
4 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
5 | * | |
6 | * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
7 | * Andreas Heppel <aheppel@sysgo.de> | |
0bc4a1ac WD |
8 | */ |
9 | ||
10 | #include <common.h> | |
0bc4a1ac | 11 | #include <command.h> |
cb3ef681 | 12 | #include <eeprom.h> |
7b51b576 | 13 | #include <env.h> |
f3998fdc | 14 | #include <env_internal.h> |
0bc4a1ac | 15 | #include <linux/stddef.h> |
3db71108 | 16 | #include <u-boot/crc.h> |
548738b4 HS |
17 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
18 | #include <i2c.h> | |
19 | #endif | |
ea882baf WD |
20 | #include <search.h> |
21 | #include <errno.h> | |
22 | #include <linux/compiler.h> /* for BUG_ON */ | |
0bc4a1ac | 23 | |
d87080b7 WD |
24 | DECLARE_GLOBAL_DATA_PTR; |
25 | ||
ea882baf | 26 | static int eeprom_bus_read(unsigned dev_addr, unsigned offset, |
dd2a233c | 27 | uchar *buffer, unsigned cnt) |
548738b4 HS |
28 | { |
29 | int rcode; | |
30 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
31 | int old_bus = i2c_get_bus_num(); | |
32 | ||
3f4978c7 HS |
33 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
34 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 HS |
35 | #endif |
36 | ||
dd2a233c | 37 | rcode = eeprom_read(dev_addr, offset, buffer, cnt); |
ea882baf | 38 | |
548738b4 | 39 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
6d001e7d | 40 | i2c_set_bus_num(old_bus); |
548738b4 | 41 | #endif |
9a2accb4 | 42 | |
548738b4 HS |
43 | return rcode; |
44 | } | |
45 | ||
ea882baf | 46 | static int eeprom_bus_write(unsigned dev_addr, unsigned offset, |
dd2a233c | 47 | uchar *buffer, unsigned cnt) |
548738b4 HS |
48 | { |
49 | int rcode; | |
50 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
51 | int old_bus = i2c_get_bus_num(); | |
52 | ||
3f4978c7 HS |
53 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
54 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 | 55 | #endif |
9a2accb4 | 56 | |
ea882baf | 57 | rcode = eeprom_write(dev_addr, offset, buffer, cnt); |
9a2accb4 | 58 | |
548738b4 HS |
59 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
60 | i2c_set_bus_num(old_bus); | |
61 | #endif | |
6d001e7d | 62 | |
548738b4 HS |
63 | return rcode; |
64 | } | |
0bc4a1ac | 65 | |
b2cdef48 GS |
66 | /** Call this function from overridden env_get_char_spec() if you need |
67 | * this functionality. | |
68 | */ | |
69 | int env_eeprom_get_char(int index) | |
0bc4a1ac WD |
70 | { |
71 | uchar c; | |
dd2a233c | 72 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 73 | |
1567b596 | 74 | #ifdef CONFIG_ENV_OFFSET_REDUND |
203e94f6 | 75 | if (gd->env_valid == ENV_REDUND) |
1567b596 HS |
76 | off = CONFIG_ENV_OFFSET_REDUND; |
77 | #endif | |
ea882baf | 78 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c | 79 | off + index + offsetof(env_t, data), &c, 1); |
0bc4a1ac | 80 | |
dd2a233c | 81 | return c; |
0bc4a1ac WD |
82 | } |
83 | ||
c5951991 | 84 | static int env_eeprom_load(void) |
0bc4a1ac | 85 | { |
e3cc5bc5 | 86 | char buf_env[CONFIG_ENV_SIZE]; |
1567b596 | 87 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 88 | |
1567b596 | 89 | #ifdef CONFIG_ENV_OFFSET_REDUND |
dd2a233c | 90 | ulong len, crc[2], crc_tmp; |
e3cc5bc5 LD |
91 | unsigned int off_env[2]; |
92 | uchar rdbuf[64], flags[2]; | |
dd2a233c | 93 | int i, crc_ok[2] = {0, 0}; |
1567b596 | 94 | |
354e3ed7 | 95 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
1567b596 HS |
96 | |
97 | off_env[0] = CONFIG_ENV_OFFSET; | |
98 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; | |
99 | ||
100 | for (i = 0; i < 2; i++) { | |
101 | /* read CRC */ | |
ea882baf | 102 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
103 | off_env[i] + offsetof(env_t, crc), |
104 | (uchar *)&crc[i], sizeof(ulong)); | |
1567b596 | 105 | /* read FLAGS */ |
ea882baf | 106 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
107 | off_env[i] + offsetof(env_t, flags), |
108 | (uchar *)&flags[i], sizeof(uchar)); | |
1567b596 | 109 | |
ea882baf | 110 | crc_tmp = 0; |
1567b596 | 111 | len = ENV_SIZE; |
dd2a233c | 112 | off = off_env[i] + offsetof(env_t, data); |
1567b596 | 113 | while (len > 0) { |
e3cc5bc5 | 114 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
1567b596 | 115 | |
ea882baf | 116 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, |
e3cc5bc5 | 117 | rdbuf, n); |
1567b596 | 118 | |
e3cc5bc5 | 119 | crc_tmp = crc32(crc_tmp, rdbuf, n); |
1567b596 HS |
120 | len -= n; |
121 | off += n; | |
122 | } | |
dd2a233c | 123 | |
1567b596 HS |
124 | if (crc_tmp == crc[i]) |
125 | crc_ok[i] = 1; | |
126 | } | |
127 | ||
128 | if (!crc_ok[0] && !crc_ok[1]) { | |
dd2a233c | 129 | gd->env_addr = 0; |
2d7cb5b4 | 130 | gd->env_valid = ENV_INVALID; |
1567b596 | 131 | } else if (crc_ok[0] && !crc_ok[1]) { |
203e94f6 | 132 | gd->env_valid = ENV_VALID; |
dd2a233c | 133 | } else if (!crc_ok[0] && crc_ok[1]) { |
203e94f6 | 134 | gd->env_valid = ENV_REDUND; |
1567b596 HS |
135 | } else { |
136 | /* both ok - check serial */ | |
d3716dd6 SG |
137 | if (flags[0] == ENV_REDUND_ACTIVE && |
138 | flags[1] == ENV_REDUND_OBSOLETE) | |
203e94f6 | 139 | gd->env_valid = ENV_VALID; |
d3716dd6 SG |
140 | else if (flags[0] == ENV_REDUND_OBSOLETE && |
141 | flags[1] == ENV_REDUND_ACTIVE) | |
203e94f6 | 142 | gd->env_valid = ENV_REDUND; |
1567b596 | 143 | else if (flags[0] == 0xFF && flags[1] == 0) |
203e94f6 | 144 | gd->env_valid = ENV_REDUND; |
dd2a233c | 145 | else if (flags[1] == 0xFF && flags[0] == 0) |
203e94f6 | 146 | gd->env_valid = ENV_VALID; |
1567b596 | 147 | else /* flags are equal - almost impossible */ |
203e94f6 | 148 | gd->env_valid = ENV_VALID; |
1567b596 HS |
149 | } |
150 | ||
e3cc5bc5 | 151 | #else /* CONFIG_ENV_OFFSET_REDUND */ |
0bc4a1ac | 152 | ulong crc, len, new; |
e3cc5bc5 | 153 | uchar rdbuf[64]; |
0bc4a1ac | 154 | |
354e3ed7 | 155 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
0bc4a1ac WD |
156 | |
157 | /* read old CRC */ | |
ea882baf | 158 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
159 | CONFIG_ENV_OFFSET + offsetof(env_t, crc), |
160 | (uchar *)&crc, sizeof(ulong)); | |
0bc4a1ac WD |
161 | |
162 | new = 0; | |
163 | len = ENV_SIZE; | |
dd2a233c | 164 | off = offsetof(env_t, data); |
0bc4a1ac | 165 | while (len > 0) { |
e3cc5bc5 | 166 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
0bc4a1ac | 167 | |
ea882baf | 168 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
e3cc5bc5 LD |
169 | CONFIG_ENV_OFFSET + off, rdbuf, n); |
170 | new = crc32(new, rdbuf, n); | |
0bc4a1ac WD |
171 | len -= n; |
172 | off += n; | |
173 | } | |
174 | ||
175 | if (crc == new) { | |
2d7cb5b4 | 176 | gd->env_valid = ENV_VALID; |
0bc4a1ac | 177 | } else { |
2d7cb5b4 | 178 | gd->env_valid = ENV_INVALID; |
0bc4a1ac | 179 | } |
e3cc5bc5 LD |
180 | #endif /* CONFIG_ENV_OFFSET_REDUND */ |
181 | ||
182 | off = CONFIG_ENV_OFFSET; | |
183 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 184 | if (gd->env_valid == ENV_REDUND) |
e3cc5bc5 LD |
185 | off = CONFIG_ENV_OFFSET_REDUND; |
186 | #endif | |
187 | ||
188 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, | |
189 | off, (uchar *)buf_env, CONFIG_ENV_SIZE); | |
190 | ||
2166ebf7 | 191 | return env_import(buf_env, 1); |
e3cc5bc5 LD |
192 | } |
193 | ||
e5bce247 | 194 | static int env_eeprom_save(void) |
e3cc5bc5 LD |
195 | { |
196 | env_t env_new; | |
197 | int rc; | |
198 | unsigned int off = CONFIG_ENV_OFFSET; | |
199 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
200 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; | |
d3716dd6 | 201 | char flag_obsolete = ENV_REDUND_OBSOLETE; |
e3cc5bc5 LD |
202 | #endif |
203 | ||
e3cc5bc5 LD |
204 | rc = env_export(&env_new); |
205 | if (rc) | |
206 | return rc; | |
207 | ||
208 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 209 | if (gd->env_valid == ENV_VALID) { |
e3cc5bc5 LD |
210 | off = CONFIG_ENV_OFFSET_REDUND; |
211 | off_red = CONFIG_ENV_OFFSET; | |
212 | } | |
213 | ||
d3716dd6 | 214 | env_new.flags = ENV_REDUND_ACTIVE; |
e3cc5bc5 LD |
215 | #endif |
216 | ||
217 | rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
218 | off, (uchar *)&env_new, CONFIG_ENV_SIZE); | |
219 | ||
220 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
221 | if (rc == 0) { | |
222 | eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
223 | off_red + offsetof(env_t, flags), | |
224 | (uchar *)&flag_obsolete, 1); | |
225 | ||
203e94f6 SG |
226 | if (gd->env_valid == ENV_VALID) |
227 | gd->env_valid = ENV_REDUND; | |
e3cc5bc5 | 228 | else |
203e94f6 | 229 | gd->env_valid = ENV_VALID; |
e3cc5bc5 LD |
230 | } |
231 | #endif | |
232 | return rc; | |
233 | } | |
234 | ||
4415f1d1 SG |
235 | U_BOOT_ENV_LOCATION(eeprom) = { |
236 | .location = ENVL_EEPROM, | |
ac358beb | 237 | ENV_NAME("EEPROM") |
e5bce247 SG |
238 | .load = env_eeprom_load, |
239 | .save = env_save_ptr(env_eeprom_save), | |
4415f1d1 | 240 | }; |