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Commit | Line | Data |
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0bc4a1ac | 1 | /* |
ea882baf | 2 | * (C) Copyright 2000-2010 |
0bc4a1ac WD |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
4 | * | |
5 | * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
6 | * Andreas Heppel <aheppel@sysgo.de> | |
ea882baf | 7 | * |
3765b3e7 | 8 | * SPDX-License-Identifier: GPL-2.0+ |
0bc4a1ac WD |
9 | */ |
10 | ||
11 | #include <common.h> | |
0bc4a1ac WD |
12 | #include <command.h> |
13 | #include <environment.h> | |
0bc4a1ac | 14 | #include <linux/stddef.h> |
548738b4 HS |
15 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
16 | #include <i2c.h> | |
17 | #endif | |
ea882baf WD |
18 | #include <search.h> |
19 | #include <errno.h> | |
20 | #include <linux/compiler.h> /* for BUG_ON */ | |
0bc4a1ac | 21 | |
d87080b7 WD |
22 | DECLARE_GLOBAL_DATA_PTR; |
23 | ||
ea882baf | 24 | static int eeprom_bus_read(unsigned dev_addr, unsigned offset, |
dd2a233c | 25 | uchar *buffer, unsigned cnt) |
548738b4 HS |
26 | { |
27 | int rcode; | |
28 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
29 | int old_bus = i2c_get_bus_num(); | |
30 | ||
3f4978c7 HS |
31 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
32 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 HS |
33 | #endif |
34 | ||
dd2a233c | 35 | rcode = eeprom_read(dev_addr, offset, buffer, cnt); |
ea882baf | 36 | |
548738b4 | 37 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
6d001e7d | 38 | i2c_set_bus_num(old_bus); |
548738b4 | 39 | #endif |
9a2accb4 | 40 | |
548738b4 HS |
41 | return rcode; |
42 | } | |
43 | ||
ea882baf | 44 | static int eeprom_bus_write(unsigned dev_addr, unsigned offset, |
dd2a233c | 45 | uchar *buffer, unsigned cnt) |
548738b4 HS |
46 | { |
47 | int rcode; | |
48 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
49 | int old_bus = i2c_get_bus_num(); | |
50 | ||
3f4978c7 HS |
51 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
52 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 | 53 | #endif |
9a2accb4 | 54 | |
ea882baf | 55 | rcode = eeprom_write(dev_addr, offset, buffer, cnt); |
9a2accb4 | 56 | |
548738b4 HS |
57 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
58 | i2c_set_bus_num(old_bus); | |
59 | #endif | |
6d001e7d | 60 | |
548738b4 HS |
61 | return rcode; |
62 | } | |
0bc4a1ac | 63 | |
b2cdef48 GS |
64 | /** Call this function from overridden env_get_char_spec() if you need |
65 | * this functionality. | |
66 | */ | |
67 | int env_eeprom_get_char(int index) | |
0bc4a1ac WD |
68 | { |
69 | uchar c; | |
dd2a233c | 70 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 71 | |
1567b596 | 72 | #ifdef CONFIG_ENV_OFFSET_REDUND |
203e94f6 | 73 | if (gd->env_valid == ENV_REDUND) |
1567b596 HS |
74 | off = CONFIG_ENV_OFFSET_REDUND; |
75 | #endif | |
ea882baf | 76 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c | 77 | off + index + offsetof(env_t, data), &c, 1); |
0bc4a1ac | 78 | |
dd2a233c | 79 | return c; |
0bc4a1ac WD |
80 | } |
81 | ||
c5951991 | 82 | static int env_eeprom_load(void) |
0bc4a1ac | 83 | { |
e3cc5bc5 | 84 | char buf_env[CONFIG_ENV_SIZE]; |
1567b596 | 85 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 86 | |
1567b596 | 87 | #ifdef CONFIG_ENV_OFFSET_REDUND |
dd2a233c | 88 | ulong len, crc[2], crc_tmp; |
e3cc5bc5 LD |
89 | unsigned int off_env[2]; |
90 | uchar rdbuf[64], flags[2]; | |
dd2a233c | 91 | int i, crc_ok[2] = {0, 0}; |
1567b596 | 92 | |
354e3ed7 | 93 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
1567b596 HS |
94 | |
95 | off_env[0] = CONFIG_ENV_OFFSET; | |
96 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; | |
97 | ||
98 | for (i = 0; i < 2; i++) { | |
99 | /* read CRC */ | |
ea882baf | 100 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
101 | off_env[i] + offsetof(env_t, crc), |
102 | (uchar *)&crc[i], sizeof(ulong)); | |
1567b596 | 103 | /* read FLAGS */ |
ea882baf | 104 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
105 | off_env[i] + offsetof(env_t, flags), |
106 | (uchar *)&flags[i], sizeof(uchar)); | |
1567b596 | 107 | |
ea882baf | 108 | crc_tmp = 0; |
1567b596 | 109 | len = ENV_SIZE; |
dd2a233c | 110 | off = off_env[i] + offsetof(env_t, data); |
1567b596 | 111 | while (len > 0) { |
e3cc5bc5 | 112 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
1567b596 | 113 | |
ea882baf | 114 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, |
e3cc5bc5 | 115 | rdbuf, n); |
1567b596 | 116 | |
e3cc5bc5 | 117 | crc_tmp = crc32(crc_tmp, rdbuf, n); |
1567b596 HS |
118 | len -= n; |
119 | off += n; | |
120 | } | |
dd2a233c | 121 | |
1567b596 HS |
122 | if (crc_tmp == crc[i]) |
123 | crc_ok[i] = 1; | |
124 | } | |
125 | ||
126 | if (!crc_ok[0] && !crc_ok[1]) { | |
dd2a233c | 127 | gd->env_addr = 0; |
2d7cb5b4 | 128 | gd->env_valid = ENV_INVALID; |
1567b596 | 129 | } else if (crc_ok[0] && !crc_ok[1]) { |
203e94f6 | 130 | gd->env_valid = ENV_VALID; |
dd2a233c | 131 | } else if (!crc_ok[0] && crc_ok[1]) { |
203e94f6 | 132 | gd->env_valid = ENV_REDUND; |
1567b596 HS |
133 | } else { |
134 | /* both ok - check serial */ | |
135 | if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) | |
203e94f6 | 136 | gd->env_valid = ENV_VALID; |
1567b596 | 137 | else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) |
203e94f6 | 138 | gd->env_valid = ENV_REDUND; |
1567b596 | 139 | else if (flags[0] == 0xFF && flags[1] == 0) |
203e94f6 | 140 | gd->env_valid = ENV_REDUND; |
dd2a233c | 141 | else if (flags[1] == 0xFF && flags[0] == 0) |
203e94f6 | 142 | gd->env_valid = ENV_VALID; |
1567b596 | 143 | else /* flags are equal - almost impossible */ |
203e94f6 | 144 | gd->env_valid = ENV_VALID; |
1567b596 HS |
145 | } |
146 | ||
e3cc5bc5 | 147 | #else /* CONFIG_ENV_OFFSET_REDUND */ |
0bc4a1ac | 148 | ulong crc, len, new; |
e3cc5bc5 | 149 | uchar rdbuf[64]; |
0bc4a1ac | 150 | |
354e3ed7 | 151 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
0bc4a1ac WD |
152 | |
153 | /* read old CRC */ | |
ea882baf | 154 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
155 | CONFIG_ENV_OFFSET + offsetof(env_t, crc), |
156 | (uchar *)&crc, sizeof(ulong)); | |
0bc4a1ac WD |
157 | |
158 | new = 0; | |
159 | len = ENV_SIZE; | |
dd2a233c | 160 | off = offsetof(env_t, data); |
0bc4a1ac | 161 | while (len > 0) { |
e3cc5bc5 | 162 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
0bc4a1ac | 163 | |
ea882baf | 164 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
e3cc5bc5 LD |
165 | CONFIG_ENV_OFFSET + off, rdbuf, n); |
166 | new = crc32(new, rdbuf, n); | |
0bc4a1ac WD |
167 | len -= n; |
168 | off += n; | |
169 | } | |
170 | ||
171 | if (crc == new) { | |
2d7cb5b4 | 172 | gd->env_valid = ENV_VALID; |
0bc4a1ac | 173 | } else { |
2d7cb5b4 | 174 | gd->env_valid = ENV_INVALID; |
0bc4a1ac | 175 | } |
e3cc5bc5 LD |
176 | #endif /* CONFIG_ENV_OFFSET_REDUND */ |
177 | ||
178 | off = CONFIG_ENV_OFFSET; | |
179 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 180 | if (gd->env_valid == ENV_REDUND) |
e3cc5bc5 LD |
181 | off = CONFIG_ENV_OFFSET_REDUND; |
182 | #endif | |
183 | ||
184 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, | |
185 | off, (uchar *)buf_env, CONFIG_ENV_SIZE); | |
186 | ||
2166ebf7 | 187 | return env_import(buf_env, 1); |
e3cc5bc5 LD |
188 | } |
189 | ||
e5bce247 | 190 | static int env_eeprom_save(void) |
e3cc5bc5 LD |
191 | { |
192 | env_t env_new; | |
193 | int rc; | |
194 | unsigned int off = CONFIG_ENV_OFFSET; | |
195 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
196 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; | |
197 | char flag_obsolete = OBSOLETE_FLAG; | |
198 | #endif | |
199 | ||
e3cc5bc5 LD |
200 | rc = env_export(&env_new); |
201 | if (rc) | |
202 | return rc; | |
203 | ||
204 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 205 | if (gd->env_valid == ENV_VALID) { |
e3cc5bc5 LD |
206 | off = CONFIG_ENV_OFFSET_REDUND; |
207 | off_red = CONFIG_ENV_OFFSET; | |
208 | } | |
209 | ||
210 | env_new.flags = ACTIVE_FLAG; | |
211 | #endif | |
212 | ||
213 | rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
214 | off, (uchar *)&env_new, CONFIG_ENV_SIZE); | |
215 | ||
216 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
217 | if (rc == 0) { | |
218 | eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
219 | off_red + offsetof(env_t, flags), | |
220 | (uchar *)&flag_obsolete, 1); | |
221 | ||
203e94f6 SG |
222 | if (gd->env_valid == ENV_VALID) |
223 | gd->env_valid = ENV_REDUND; | |
e3cc5bc5 | 224 | else |
203e94f6 | 225 | gd->env_valid = ENV_VALID; |
e3cc5bc5 LD |
226 | } |
227 | #endif | |
228 | return rc; | |
229 | } | |
230 | ||
4415f1d1 SG |
231 | U_BOOT_ENV_LOCATION(eeprom) = { |
232 | .location = ENVL_EEPROM, | |
ac358beb | 233 | ENV_NAME("EEPROM") |
e5bce247 SG |
234 | .load = env_eeprom_load, |
235 | .save = env_save_ptr(env_eeprom_save), | |
4415f1d1 | 236 | }; |