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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 | |
dd2a233c | 68 | uchar env_get_char_spec(int index) |
0bc4a1ac WD |
69 | { |
70 | uchar c; | |
dd2a233c | 71 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 72 | |
1567b596 HS |
73 | #ifdef CONFIG_ENV_OFFSET_REDUND |
74 | if (gd->env_valid == 2) | |
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 | ||
dd2a233c | 83 | void env_relocate_spec(void) |
0bc4a1ac | 84 | { |
cd0f4fa1 | 85 | char buf[CONFIG_ENV_SIZE]; |
1567b596 | 86 | unsigned int off = CONFIG_ENV_OFFSET; |
ea882baf | 87 | |
1567b596 HS |
88 | #ifdef CONFIG_ENV_OFFSET_REDUND |
89 | if (gd->env_valid == 2) | |
90 | off = CONFIG_ENV_OFFSET_REDUND; | |
91 | #endif | |
ea882baf | 92 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c | 93 | off, (uchar *)buf, CONFIG_ENV_SIZE); |
ea882baf WD |
94 | |
95 | env_import(buf, 1); | |
0bc4a1ac WD |
96 | } |
97 | ||
98 | int saveenv(void) | |
99 | { | |
cd0f4fa1 | 100 | env_t env_new; |
ea882baf WD |
101 | ssize_t len; |
102 | char *res; | |
dd2a233c IG |
103 | int rc; |
104 | unsigned int off = CONFIG_ENV_OFFSET; | |
1567b596 | 105 | #ifdef CONFIG_ENV_OFFSET_REDUND |
dd2a233c IG |
106 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; |
107 | char flag_obsolete = OBSOLETE_FLAG; | |
ea882baf WD |
108 | #endif |
109 | ||
110 | BUG_ON(env_ptr != NULL); | |
111 | ||
cd0f4fa1 | 112 | res = (char *)&env_new.data; |
be11235a | 113 | len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL); |
ea882baf WD |
114 | if (len < 0) { |
115 | error("Cannot export environment: errno = %d\n", errno); | |
116 | return 1; | |
117 | } | |
cd0f4fa1 | 118 | env_new.crc = crc32(0, env_new.data, ENV_SIZE); |
ea882baf WD |
119 | |
120 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
1567b596 | 121 | if (gd->env_valid == 1) { |
dd2a233c IG |
122 | off = CONFIG_ENV_OFFSET_REDUND; |
123 | off_red = CONFIG_ENV_OFFSET; | |
1567b596 HS |
124 | } |
125 | ||
cd0f4fa1 | 126 | env_new.flags = ACTIVE_FLAG; |
1567b596 HS |
127 | #endif |
128 | ||
ea882baf | 129 | rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, |
cd0f4fa1 | 130 | off, (uchar *)&env_new, CONFIG_ENV_SIZE); |
1567b596 HS |
131 | |
132 | #ifdef CONFIG_ENV_OFFSET_REDUND | |
133 | if (rc == 0) { | |
ea882baf | 134 | eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
135 | off_red + offsetof(env_t, flags), |
136 | (uchar *)&flag_obsolete, 1); | |
137 | ||
1567b596 HS |
138 | if (gd->env_valid == 1) |
139 | gd->env_valid = 2; | |
140 | else | |
141 | gd->env_valid = 1; | |
1567b596 HS |
142 | } |
143 | #endif | |
1567b596 | 144 | return rc; |
0bc4a1ac WD |
145 | } |
146 | ||
ea882baf | 147 | /* |
0bc4a1ac WD |
148 | * Initialize Environment use |
149 | * | |
ea882baf | 150 | * We are still running from ROM, so data use is limited. |
0bc4a1ac WD |
151 | * Use a (moderately small) buffer on the stack |
152 | */ | |
1567b596 HS |
153 | #ifdef CONFIG_ENV_OFFSET_REDUND |
154 | int env_init(void) | |
155 | { | |
dd2a233c | 156 | ulong len, crc[2], crc_tmp; |
1567b596 | 157 | unsigned int off, off_env[2]; |
dd2a233c IG |
158 | uchar buf[64], flags[2]; |
159 | int i, crc_ok[2] = {0, 0}; | |
1567b596 | 160 | |
ea882baf | 161 | eeprom_init(); /* prepare for EEPROM read/write */ |
1567b596 HS |
162 | |
163 | off_env[0] = CONFIG_ENV_OFFSET; | |
164 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; | |
165 | ||
166 | for (i = 0; i < 2; i++) { | |
167 | /* read CRC */ | |
ea882baf | 168 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
169 | off_env[i] + offsetof(env_t, crc), |
170 | (uchar *)&crc[i], sizeof(ulong)); | |
1567b596 | 171 | /* read FLAGS */ |
ea882baf | 172 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
173 | off_env[i] + offsetof(env_t, flags), |
174 | (uchar *)&flags[i], sizeof(uchar)); | |
1567b596 | 175 | |
ea882baf | 176 | crc_tmp = 0; |
1567b596 | 177 | len = ENV_SIZE; |
dd2a233c | 178 | off = off_env[i] + offsetof(env_t, data); |
1567b596 HS |
179 | while (len > 0) { |
180 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
181 | ||
ea882baf | 182 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off, |
dd2a233c | 183 | buf, n); |
1567b596 | 184 | |
ea882baf | 185 | crc_tmp = crc32(crc_tmp, buf, n); |
1567b596 HS |
186 | len -= n; |
187 | off += n; | |
188 | } | |
dd2a233c | 189 | |
1567b596 HS |
190 | if (crc_tmp == crc[i]) |
191 | crc_ok[i] = 1; | |
192 | } | |
193 | ||
194 | if (!crc_ok[0] && !crc_ok[1]) { | |
dd2a233c IG |
195 | gd->env_addr = 0; |
196 | gd->env_valid = 0; | |
1567b596 HS |
197 | |
198 | return 0; | |
199 | } else if (crc_ok[0] && !crc_ok[1]) { | |
200 | gd->env_valid = 1; | |
dd2a233c | 201 | } else if (!crc_ok[0] && crc_ok[1]) { |
1567b596 HS |
202 | gd->env_valid = 2; |
203 | } else { | |
204 | /* both ok - check serial */ | |
205 | if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) | |
206 | gd->env_valid = 1; | |
207 | else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) | |
208 | gd->env_valid = 2; | |
209 | else if (flags[0] == 0xFF && flags[1] == 0) | |
210 | gd->env_valid = 2; | |
dd2a233c | 211 | else if (flags[1] == 0xFF && flags[0] == 0) |
1567b596 HS |
212 | gd->env_valid = 1; |
213 | else /* flags are equal - almost impossible */ | |
214 | gd->env_valid = 1; | |
215 | } | |
216 | ||
217 | if (gd->env_valid == 2) | |
dd2a233c | 218 | gd->env_addr = off_env[1] + offsetof(env_t, data); |
1567b596 | 219 | else if (gd->env_valid == 1) |
dd2a233c | 220 | gd->env_addr = off_env[0] + offsetof(env_t, data); |
1567b596 | 221 | |
dd2a233c | 222 | return 0; |
1567b596 HS |
223 | } |
224 | #else | |
0bc4a1ac WD |
225 | int env_init(void) |
226 | { | |
0bc4a1ac WD |
227 | ulong crc, len, new; |
228 | unsigned off; | |
229 | uchar buf[64]; | |
230 | ||
ea882baf | 231 | eeprom_init(); /* prepare for EEPROM read/write */ |
0bc4a1ac WD |
232 | |
233 | /* read old CRC */ | |
ea882baf | 234 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
dd2a233c IG |
235 | CONFIG_ENV_OFFSET + offsetof(env_t, crc), |
236 | (uchar *)&crc, sizeof(ulong)); | |
0bc4a1ac WD |
237 | |
238 | new = 0; | |
239 | len = ENV_SIZE; | |
dd2a233c | 240 | off = offsetof(env_t, data); |
ea882baf | 241 | |
0bc4a1ac WD |
242 | while (len > 0) { |
243 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
244 | ||
ea882baf | 245 | eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, |
548738b4 | 246 | CONFIG_ENV_OFFSET + off, buf, n); |
ea882baf | 247 | new = crc32(new, buf, n); |
0bc4a1ac WD |
248 | len -= n; |
249 | off += n; | |
250 | } | |
251 | ||
252 | if (crc == new) { | |
dd2a233c IG |
253 | gd->env_addr = offsetof(env_t, data); |
254 | gd->env_valid = 1; | |
0bc4a1ac | 255 | } else { |
dd2a233c IG |
256 | gd->env_addr = 0; |
257 | gd->env_valid = 0; | |
0bc4a1ac WD |
258 | } |
259 | ||
dd2a233c | 260 | return 0; |
0bc4a1ac | 261 | } |
1567b596 | 262 | #endif |