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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 | ||
dd2a233c | 24 | env_t *env_ptr; |
0bc4a1ac | 25 | |
ea882baf | 26 | char *env_name_spec = "EEPROM"; |
548738b4 | 27 | |
ea882baf | 28 | static int eeprom_bus_read(unsigned dev_addr, unsigned offset, |
dd2a233c | 29 | uchar *buffer, unsigned cnt) |
548738b4 HS |
30 | { |
31 | int rcode; | |
32 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
33 | int old_bus = i2c_get_bus_num(); | |
34 | ||
3f4978c7 HS |
35 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
36 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 HS |
37 | #endif |
38 | ||
dd2a233c | 39 | rcode = eeprom_read(dev_addr, offset, buffer, cnt); |
ea882baf | 40 | |
548738b4 | 41 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
6d001e7d | 42 | i2c_set_bus_num(old_bus); |
548738b4 | 43 | #endif |
9a2accb4 | 44 | |
548738b4 HS |
45 | return rcode; |
46 | } | |
47 | ||
ea882baf | 48 | static int eeprom_bus_write(unsigned dev_addr, unsigned offset, |
dd2a233c | 49 | uchar *buffer, unsigned cnt) |
548738b4 HS |
50 | { |
51 | int rcode; | |
52 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
53 | int old_bus = i2c_get_bus_num(); | |
54 | ||
3f4978c7 HS |
55 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
56 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 | 57 | #endif |
9a2accb4 | 58 | |
ea882baf | 59 | rcode = eeprom_write(dev_addr, offset, buffer, cnt); |
9a2accb4 | 60 | |
548738b4 HS |
61 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
62 | i2c_set_bus_num(old_bus); | |
63 | #endif | |
6d001e7d | 64 | |
548738b4 HS |
65 | return rcode; |
66 | } | |
0bc4a1ac | 67 | |
e5bce247 | 68 | static uchar env_eeprom_get_char(int index) |
0bc4a1ac WD |
69 | { |
70 | uchar c; | |
dd2a233c | 71 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 72 | |
1567b596 | 73 | #ifdef CONFIG_ENV_OFFSET_REDUND |
203e94f6 | 74 | if (gd->env_valid == ENV_REDUND) |
1567b596 HS |
75 | off = CONFIG_ENV_OFFSET_REDUND; |
76 | #endif | |
ea882baf | 77 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c | 78 | off + index + offsetof(env_t, data), &c, 1); |
0bc4a1ac | 79 | |
dd2a233c | 80 | return c; |
0bc4a1ac WD |
81 | } |
82 | ||
e5bce247 | 83 | static void env_eeprom_load(void) |
0bc4a1ac | 84 | { |
e3cc5bc5 | 85 | char buf_env[CONFIG_ENV_SIZE]; |
1567b596 | 86 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 87 | |
1567b596 | 88 | #ifdef CONFIG_ENV_OFFSET_REDUND |
dd2a233c | 89 | ulong len, crc[2], crc_tmp; |
e3cc5bc5 LD |
90 | unsigned int off_env[2]; |
91 | uchar rdbuf[64], flags[2]; | |
dd2a233c | 92 | int i, crc_ok[2] = {0, 0}; |
1567b596 | 93 | |
354e3ed7 | 94 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
1567b596 HS |
95 | |
96 | off_env[0] = CONFIG_ENV_OFFSET; | |
97 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; | |
98 | ||
99 | for (i = 0; i < 2; i++) { | |
100 | /* read CRC */ | |
ea882baf | 101 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
102 | off_env[i] + offsetof(env_t, crc), |
103 | (uchar *)&crc[i], sizeof(ulong)); | |
1567b596 | 104 | /* read FLAGS */ |
ea882baf | 105 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
106 | off_env[i] + offsetof(env_t, flags), |
107 | (uchar *)&flags[i], sizeof(uchar)); | |
1567b596 | 108 | |
ea882baf | 109 | crc_tmp = 0; |
1567b596 | 110 | len = ENV_SIZE; |
dd2a233c | 111 | off = off_env[i] + offsetof(env_t, data); |
1567b596 | 112 | while (len > 0) { |
e3cc5bc5 | 113 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
1567b596 | 114 | |
ea882baf | 115 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, |
e3cc5bc5 | 116 | rdbuf, n); |
1567b596 | 117 | |
e3cc5bc5 | 118 | crc_tmp = crc32(crc_tmp, rdbuf, n); |
1567b596 HS |
119 | len -= n; |
120 | off += n; | |
121 | } | |
dd2a233c | 122 | |
1567b596 HS |
123 | if (crc_tmp == crc[i]) |
124 | crc_ok[i] = 1; | |
125 | } | |
126 | ||
127 | if (!crc_ok[0] && !crc_ok[1]) { | |
dd2a233c IG |
128 | gd->env_addr = 0; |
129 | gd->env_valid = 0; | |
1567b596 | 130 | } else if (crc_ok[0] && !crc_ok[1]) { |
203e94f6 | 131 | gd->env_valid = ENV_VALID; |
dd2a233c | 132 | } else if (!crc_ok[0] && crc_ok[1]) { |
203e94f6 | 133 | gd->env_valid = ENV_REDUND; |
1567b596 HS |
134 | } else { |
135 | /* both ok - check serial */ | |
136 | if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) | |
203e94f6 | 137 | gd->env_valid = ENV_VALID; |
1567b596 | 138 | else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) |
203e94f6 | 139 | gd->env_valid = ENV_REDUND; |
1567b596 | 140 | else if (flags[0] == 0xFF && flags[1] == 0) |
203e94f6 | 141 | gd->env_valid = ENV_REDUND; |
dd2a233c | 142 | else if (flags[1] == 0xFF && flags[0] == 0) |
203e94f6 | 143 | gd->env_valid = ENV_VALID; |
1567b596 | 144 | else /* flags are equal - almost impossible */ |
203e94f6 | 145 | gd->env_valid = ENV_VALID; |
1567b596 HS |
146 | } |
147 | ||
e3cc5bc5 | 148 | #else /* CONFIG_ENV_OFFSET_REDUND */ |
0bc4a1ac | 149 | ulong crc, len, new; |
e3cc5bc5 | 150 | uchar rdbuf[64]; |
0bc4a1ac | 151 | |
354e3ed7 | 152 | eeprom_init(-1); /* prepare for EEPROM read/write */ |
0bc4a1ac WD |
153 | |
154 | /* read old CRC */ | |
ea882baf | 155 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
156 | CONFIG_ENV_OFFSET + offsetof(env_t, crc), |
157 | (uchar *)&crc, sizeof(ulong)); | |
0bc4a1ac WD |
158 | |
159 | new = 0; | |
160 | len = ENV_SIZE; | |
dd2a233c | 161 | off = offsetof(env_t, data); |
0bc4a1ac | 162 | while (len > 0) { |
e3cc5bc5 | 163 | int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len; |
0bc4a1ac | 164 | |
ea882baf | 165 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
e3cc5bc5 LD |
166 | CONFIG_ENV_OFFSET + off, rdbuf, n); |
167 | new = crc32(new, rdbuf, n); | |
0bc4a1ac WD |
168 | len -= n; |
169 | off += n; | |
170 | } | |
171 | ||
172 | if (crc == new) { | |
203e94f6 | 173 | gd->env_valid = ENV_VALID; |
0bc4a1ac | 174 | } else { |
dd2a233c | 175 | gd->env_valid = 0; |
0bc4a1ac | 176 | } |
e3cc5bc5 LD |
177 | #endif /* CONFIG_ENV_OFFSET_REDUND */ |
178 | ||
179 | off = CONFIG_ENV_OFFSET; | |
180 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 181 | if (gd->env_valid == ENV_REDUND) |
e3cc5bc5 LD |
182 | off = CONFIG_ENV_OFFSET_REDUND; |
183 | #endif | |
184 | ||
185 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, | |
186 | off, (uchar *)buf_env, CONFIG_ENV_SIZE); | |
187 | ||
188 | env_import(buf_env, 1); | |
189 | } | |
190 | ||
e5bce247 | 191 | static int env_eeprom_save(void) |
e3cc5bc5 LD |
192 | { |
193 | env_t env_new; | |
194 | int rc; | |
195 | unsigned int off = CONFIG_ENV_OFFSET; | |
196 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
197 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; | |
198 | char flag_obsolete = OBSOLETE_FLAG; | |
199 | #endif | |
200 | ||
201 | BUG_ON(env_ptr != NULL); | |
202 | ||
203 | rc = env_export(&env_new); | |
204 | if (rc) | |
205 | return rc; | |
206 | ||
207 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
203e94f6 | 208 | if (gd->env_valid == ENV_VALID) { |
e3cc5bc5 LD |
209 | off = CONFIG_ENV_OFFSET_REDUND; |
210 | off_red = CONFIG_ENV_OFFSET; | |
211 | } | |
212 | ||
213 | env_new.flags = ACTIVE_FLAG; | |
214 | #endif | |
215 | ||
216 | rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
217 | off, (uchar *)&env_new, CONFIG_ENV_SIZE); | |
218 | ||
219 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
220 | if (rc == 0) { | |
221 | eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, | |
222 | off_red + offsetof(env_t, flags), | |
223 | (uchar *)&flag_obsolete, 1); | |
224 | ||
203e94f6 SG |
225 | if (gd->env_valid == ENV_VALID) |
226 | gd->env_valid = ENV_REDUND; | |
e3cc5bc5 | 227 | else |
203e94f6 | 228 | gd->env_valid = ENV_VALID; |
e3cc5bc5 LD |
229 | } |
230 | #endif | |
231 | return rc; | |
232 | } | |
233 | ||
4415f1d1 SG |
234 | U_BOOT_ENV_LOCATION(eeprom) = { |
235 | .location = ENVL_EEPROM, | |
e5bce247 SG |
236 | .get_char = env_eeprom_get_char, |
237 | .load = env_eeprom_load, | |
238 | .save = env_save_ptr(env_eeprom_save), | |
4415f1d1 | 239 | }; |