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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 | * |
1a459660 | 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 HS |
27 | int env_eeprom_bus = -1; |
28 | ||
ea882baf | 29 | static int eeprom_bus_read(unsigned dev_addr, unsigned offset, |
dd2a233c | 30 | uchar *buffer, unsigned cnt) |
548738b4 HS |
31 | { |
32 | int rcode; | |
33 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
34 | int old_bus = i2c_get_bus_num(); | |
35 | ||
3f4978c7 HS |
36 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
37 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 HS |
38 | #endif |
39 | ||
dd2a233c | 40 | rcode = eeprom_read(dev_addr, offset, buffer, cnt); |
ea882baf | 41 | |
548738b4 HS |
42 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
43 | if (old_bus != env_eeprom_bus) | |
44 | i2c_set_bus_num(old_bus); | |
45 | #endif | |
9a2accb4 | 46 | |
548738b4 HS |
47 | return rcode; |
48 | } | |
49 | ||
ea882baf | 50 | static int eeprom_bus_write(unsigned dev_addr, unsigned offset, |
dd2a233c | 51 | uchar *buffer, unsigned cnt) |
548738b4 HS |
52 | { |
53 | int rcode; | |
54 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) | |
55 | int old_bus = i2c_get_bus_num(); | |
56 | ||
3f4978c7 HS |
57 | if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS) |
58 | i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS); | |
548738b4 | 59 | #endif |
9a2accb4 | 60 | |
ea882baf | 61 | rcode = eeprom_write(dev_addr, offset, buffer, cnt); |
9a2accb4 | 62 | |
548738b4 HS |
63 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
64 | i2c_set_bus_num(old_bus); | |
65 | #endif | |
66 | return rcode; | |
67 | } | |
0bc4a1ac | 68 | |
dd2a233c | 69 | uchar env_get_char_spec(int index) |
0bc4a1ac WD |
70 | { |
71 | uchar c; | |
dd2a233c | 72 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 73 | |
1567b596 HS |
74 | #ifdef CONFIG_ENV_OFFSET_REDUND |
75 | if (gd->env_valid == 2) | |
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 | ||
dd2a233c | 84 | void env_relocate_spec(void) |
0bc4a1ac | 85 | { |
cd0f4fa1 | 86 | char buf[CONFIG_ENV_SIZE]; |
1567b596 | 87 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 88 | |
1567b596 HS |
89 | #ifdef CONFIG_ENV_OFFSET_REDUND |
90 | if (gd->env_valid == 2) | |
91 | off = CONFIG_ENV_OFFSET_REDUND; | |
92 | #endif | |
ea882baf | 93 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c | 94 | off, (uchar *)buf, CONFIG_ENV_SIZE); |
ea882baf WD |
95 | |
96 | env_import(buf, 1); | |
0bc4a1ac WD |
97 | } |
98 | ||
99 | int saveenv(void) | |
100 | { | |
cd0f4fa1 | 101 | env_t env_new; |
ea882baf WD |
102 | ssize_t len; |
103 | char *res; | |
dd2a233c IG |
104 | int rc; |
105 | unsigned int off = CONFIG_ENV_OFFSET; | |
1567b596 | 106 | #ifdef CONFIG_ENV_OFFSET_REDUND |
dd2a233c IG |
107 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; |
108 | char flag_obsolete = OBSOLETE_FLAG; | |
ea882baf WD |
109 | #endif |
110 | ||
111 | BUG_ON(env_ptr != NULL); | |
112 | ||
cd0f4fa1 | 113 | res = (char *)&env_new.data; |
be11235a | 114 | len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL); |
ea882baf WD |
115 | if (len < 0) { |
116 | error("Cannot export environment: errno = %d\n", errno); | |
117 | return 1; | |
118 | } | |
cd0f4fa1 | 119 | env_new.crc = crc32(0, env_new.data, ENV_SIZE); |
ea882baf WD |
120 | |
121 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
1567b596 | 122 | if (gd->env_valid == 1) { |
dd2a233c IG |
123 | off = CONFIG_ENV_OFFSET_REDUND; |
124 | off_red = CONFIG_ENV_OFFSET; | |
1567b596 HS |
125 | } |
126 | ||
cd0f4fa1 | 127 | env_new.flags = ACTIVE_FLAG; |
1567b596 HS |
128 | #endif |
129 | ||
ea882baf | 130 | rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, |
cd0f4fa1 | 131 | off, (uchar *)&env_new, CONFIG_ENV_SIZE); |
1567b596 HS |
132 | |
133 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
134 | if (rc == 0) { | |
ea882baf | 135 | eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
136 | off_red + offsetof(env_t, flags), |
137 | (uchar *)&flag_obsolete, 1); | |
138 | ||
1567b596 HS |
139 | if (gd->env_valid == 1) |
140 | gd->env_valid = 2; | |
141 | else | |
142 | gd->env_valid = 1; | |
1567b596 HS |
143 | } |
144 | #endif | |
1567b596 | 145 | return rc; |
0bc4a1ac WD |
146 | } |
147 | ||
ea882baf | 148 | /* |
0bc4a1ac WD |
149 | * Initialize Environment use |
150 | * | |
ea882baf | 151 | * We are still running from ROM, so data use is limited. |
0bc4a1ac WD |
152 | * Use a (moderately small) buffer on the stack |
153 | */ | |
1567b596 HS |
154 | #ifdef CONFIG_ENV_OFFSET_REDUND |
155 | int env_init(void) | |
156 | { | |
dd2a233c | 157 | ulong len, crc[2], crc_tmp; |
1567b596 | 158 | unsigned int off, off_env[2]; |
dd2a233c IG |
159 | uchar buf[64], flags[2]; |
160 | int i, crc_ok[2] = {0, 0}; | |
1567b596 | 161 | |
ea882baf | 162 | eeprom_init(); /* prepare for EEPROM read/write */ |
1567b596 HS |
163 | |
164 | off_env[0] = CONFIG_ENV_OFFSET; | |
165 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; | |
166 | ||
167 | for (i = 0; i < 2; i++) { | |
168 | /* read CRC */ | |
ea882baf | 169 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
170 | off_env[i] + offsetof(env_t, crc), |
171 | (uchar *)&crc[i], sizeof(ulong)); | |
1567b596 | 172 | /* read FLAGS */ |
ea882baf | 173 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
174 | off_env[i] + offsetof(env_t, flags), |
175 | (uchar *)&flags[i], sizeof(uchar)); | |
1567b596 | 176 | |
ea882baf | 177 | crc_tmp = 0; |
1567b596 | 178 | len = ENV_SIZE; |
dd2a233c | 179 | off = off_env[i] + offsetof(env_t, data); |
1567b596 HS |
180 | while (len > 0) { |
181 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
182 | ||
ea882baf | 183 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, |
dd2a233c | 184 | buf, n); |
1567b596 | 185 | |
ea882baf | 186 | crc_tmp = crc32(crc_tmp, buf, n); |
1567b596 HS |
187 | len -= n; |
188 | off += n; | |
189 | } | |
dd2a233c | 190 | |
1567b596 HS |
191 | if (crc_tmp == crc[i]) |
192 | crc_ok[i] = 1; | |
193 | } | |
194 | ||
195 | if (!crc_ok[0] && !crc_ok[1]) { | |
dd2a233c IG |
196 | gd->env_addr = 0; |
197 | gd->env_valid = 0; | |
1567b596 HS |
198 | |
199 | return 0; | |
200 | } else if (crc_ok[0] && !crc_ok[1]) { | |
201 | gd->env_valid = 1; | |
dd2a233c | 202 | } else if (!crc_ok[0] && crc_ok[1]) { |
1567b596 HS |
203 | gd->env_valid = 2; |
204 | } else { | |
205 | /* both ok - check serial */ | |
206 | if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) | |
207 | gd->env_valid = 1; | |
208 | else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) | |
209 | gd->env_valid = 2; | |
210 | else if (flags[0] == 0xFF && flags[1] == 0) | |
211 | gd->env_valid = 2; | |
dd2a233c | 212 | else if (flags[1] == 0xFF && flags[0] == 0) |
1567b596 HS |
213 | gd->env_valid = 1; |
214 | else /* flags are equal - almost impossible */ | |
215 | gd->env_valid = 1; | |
216 | } | |
217 | ||
218 | if (gd->env_valid == 2) | |
dd2a233c | 219 | gd->env_addr = off_env[1] + offsetof(env_t, data); |
1567b596 | 220 | else if (gd->env_valid == 1) |
dd2a233c | 221 | gd->env_addr = off_env[0] + offsetof(env_t, data); |
1567b596 | 222 | |
dd2a233c | 223 | return 0; |
1567b596 HS |
224 | } |
225 | #else | |
0bc4a1ac WD |
226 | int env_init(void) |
227 | { | |
0bc4a1ac WD |
228 | ulong crc, len, new; |
229 | unsigned off; | |
230 | uchar buf[64]; | |
231 | ||
ea882baf | 232 | eeprom_init(); /* prepare for EEPROM read/write */ |
0bc4a1ac WD |
233 | |
234 | /* read old CRC */ | |
ea882baf | 235 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
236 | CONFIG_ENV_OFFSET + offsetof(env_t, crc), |
237 | (uchar *)&crc, sizeof(ulong)); | |
0bc4a1ac WD |
238 | |
239 | new = 0; | |
240 | len = ENV_SIZE; | |
dd2a233c | 241 | off = offsetof(env_t, data); |
ea882baf | 242 | |
0bc4a1ac WD |
243 | while (len > 0) { |
244 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
245 | ||
ea882baf | 246 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
548738b4 | 247 | CONFIG_ENV_OFFSET + off, buf, n); |
ea882baf | 248 | new = crc32(new, buf, n); |
0bc4a1ac WD |
249 | len -= n; |
250 | off += n; | |
251 | } | |
252 | ||
253 | if (crc == new) { | |
dd2a233c IG |
254 | gd->env_addr = offsetof(env_t, data); |
255 | gd->env_valid = 1; | |
0bc4a1ac | 256 | } else { |
dd2a233c IG |
257 | gd->env_addr = 0; |
258 | gd->env_valid = 0; | |
0bc4a1ac WD |
259 | } |
260 | ||
dd2a233c | 261 | return 0; |
0bc4a1ac | 262 | } |
1567b596 | 263 | #endif |