wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000-2002 |
| 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> |
| 7 | |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <common.h> |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 28 | #include <command.h> |
| 29 | #include <environment.h> |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 30 | #include <linux/stddef.h> |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 31 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
| 32 | #include <i2c.h> |
| 33 | #endif |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 34 | |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 35 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 36 | #define ACTIVE_FLAG 1 |
| 37 | #define OBSOLETE_FLAG 0 |
| 38 | #endif |
| 39 | |
Wolfgang Denk | d87080b | 2006-03-31 18:32:53 +0200 | [diff] [blame] | 40 | DECLARE_GLOBAL_DATA_PTR; |
| 41 | |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 42 | env_t *env_ptr = NULL; |
| 43 | |
| 44 | char * env_name_spec = "EEPROM"; |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 45 | int env_eeprom_bus = -1; |
| 46 | |
| 47 | static int eeprom_bus_read (unsigned dev_addr, unsigned offset, uchar *buffer, |
| 48 | unsigned cnt) |
| 49 | { |
| 50 | int rcode; |
| 51 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
| 52 | int old_bus = i2c_get_bus_num(); |
| 53 | |
| 54 | if (gd->flags & GD_FLG_RELOC) { |
| 55 | if (env_eeprom_bus == -1) { |
| 56 | I2C_MUX_DEVICE *dev = NULL; |
| 57 | dev = i2c_mux_ident_muxstring( |
| 58 | (uchar *)CONFIG_I2C_ENV_EEPROM_BUS); |
| 59 | if (dev != NULL) { |
| 60 | env_eeprom_bus = dev->busid; |
| 61 | } else |
| 62 | printf ("error adding env eeprom bus.\n"); |
| 63 | } |
| 64 | if (old_bus != env_eeprom_bus) { |
| 65 | i2c_set_bus_num(env_eeprom_bus); |
| 66 | old_bus = env_eeprom_bus; |
| 67 | } |
| 68 | } else { |
| 69 | rcode = i2c_mux_ident_muxstring_f( |
| 70 | (uchar *)CONFIG_I2C_ENV_EEPROM_BUS); |
| 71 | } |
| 72 | #endif |
| 73 | |
| 74 | rcode = eeprom_read (dev_addr, offset, buffer, cnt); |
| 75 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
| 76 | if (old_bus != env_eeprom_bus) |
| 77 | i2c_set_bus_num(old_bus); |
| 78 | #endif |
| 79 | return rcode; |
| 80 | } |
| 81 | |
| 82 | static int eeprom_bus_write (unsigned dev_addr, unsigned offset, uchar *buffer, |
| 83 | unsigned cnt) |
| 84 | { |
| 85 | int rcode; |
| 86 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
| 87 | int old_bus = i2c_get_bus_num(); |
| 88 | |
| 89 | rcode = i2c_mux_ident_muxstring_f((uchar *)CONFIG_I2C_ENV_EEPROM_BUS); |
| 90 | #endif |
| 91 | rcode = eeprom_write (dev_addr, offset, buffer, cnt); |
| 92 | #if defined(CONFIG_I2C_ENV_EEPROM_BUS) |
| 93 | i2c_set_bus_num(old_bus); |
| 94 | #endif |
| 95 | return rcode; |
| 96 | } |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 97 | |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 98 | uchar env_get_char_spec (int index) |
| 99 | { |
| 100 | uchar c; |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 101 | unsigned int off; |
| 102 | off = CONFIG_ENV_OFFSET; |
| 103 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 104 | if (gd->env_valid == 2) |
| 105 | off = CONFIG_ENV_OFFSET_REDUND; |
| 106 | #endif |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 107 | |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 108 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 109 | off + index + offsetof(env_t,data), |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 110 | &c, 1); |
| 111 | |
| 112 | return (c); |
| 113 | } |
| 114 | |
| 115 | void env_relocate_spec (void) |
| 116 | { |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 117 | unsigned int off = CONFIG_ENV_OFFSET; |
| 118 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 119 | if (gd->env_valid == 2) |
| 120 | off = CONFIG_ENV_OFFSET_REDUND; |
| 121 | #endif |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 122 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 123 | off, |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 124 | (uchar*)env_ptr, |
Jean-Christophe PLAGNIOL-VILLARD | 0e8d158 | 2008-09-10 22:48:06 +0200 | [diff] [blame] | 125 | CONFIG_ENV_SIZE); |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | int saveenv(void) |
| 129 | { |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 130 | int rc; |
| 131 | unsigned int off = CONFIG_ENV_OFFSET; |
| 132 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 133 | unsigned int off_red = CONFIG_ENV_OFFSET_REDUND; |
| 134 | char flag_obsolete = OBSOLETE_FLAG; |
| 135 | if (gd->env_valid == 1) { |
| 136 | off = CONFIG_ENV_OFFSET_REDUND; |
| 137 | off_red = CONFIG_ENV_OFFSET; |
| 138 | } |
| 139 | |
| 140 | env_ptr->flags = ACTIVE_FLAG; |
| 141 | #endif |
| 142 | |
| 143 | rc = eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR, |
| 144 | off, |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 145 | (uchar *)env_ptr, |
Jean-Christophe PLAGNIOL-VILLARD | 0e8d158 | 2008-09-10 22:48:06 +0200 | [diff] [blame] | 146 | CONFIG_ENV_SIZE); |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 147 | |
| 148 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 149 | if (rc == 0) { |
| 150 | eeprom_bus_write (CONFIG_SYS_DEF_EEPROM_ADDR, |
| 151 | off_red + offsetof(env_t,flags), |
| 152 | (uchar *)&flag_obsolete, |
| 153 | 1); |
| 154 | if (gd->env_valid == 1) |
| 155 | gd->env_valid = 2; |
| 156 | else |
| 157 | gd->env_valid = 1; |
| 158 | |
| 159 | } |
| 160 | #endif |
| 161 | |
| 162 | return rc; |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | /************************************************************************ |
| 166 | * Initialize Environment use |
| 167 | * |
| 168 | * We are still running from ROM, so data use is limited |
| 169 | * Use a (moderately small) buffer on the stack |
| 170 | */ |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 171 | |
| 172 | #ifdef CONFIG_ENV_OFFSET_REDUND |
| 173 | int env_init(void) |
| 174 | { |
| 175 | ulong len; |
| 176 | ulong crc[2], crc_tmp; |
| 177 | unsigned int off, off_env[2]; |
| 178 | uchar buf[64]; |
| 179 | int crc_ok[2] = {0,0}; |
| 180 | unsigned char flags[2]; |
| 181 | int i; |
| 182 | |
| 183 | eeprom_init (); /* prepare for EEPROM read/write */ |
| 184 | |
| 185 | off_env[0] = CONFIG_ENV_OFFSET; |
| 186 | off_env[1] = CONFIG_ENV_OFFSET_REDUND; |
| 187 | |
| 188 | for (i = 0; i < 2; i++) { |
| 189 | /* read CRC */ |
| 190 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
| 191 | off_env[i] + offsetof(env_t,crc), |
| 192 | (uchar *)&crc[i], sizeof(ulong)); |
| 193 | /* read FLAGS */ |
| 194 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
| 195 | off_env[i] + offsetof(env_t,flags), |
| 196 | (uchar *)&flags[i], sizeof(uchar)); |
| 197 | |
| 198 | crc_tmp= 0; |
| 199 | len = ENV_SIZE; |
| 200 | off = off_env[i] + offsetof(env_t,data); |
| 201 | while (len > 0) { |
| 202 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; |
| 203 | |
| 204 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, off, |
| 205 | buf, n); |
| 206 | |
| 207 | crc_tmp = crc32 (crc_tmp, buf, n); |
| 208 | len -= n; |
| 209 | off += n; |
| 210 | } |
| 211 | if (crc_tmp == crc[i]) |
| 212 | crc_ok[i] = 1; |
| 213 | } |
| 214 | |
| 215 | if (!crc_ok[0] && !crc_ok[1]) { |
| 216 | gd->env_addr = 0; |
| 217 | gd->env_valid = 0; |
| 218 | |
| 219 | return 0; |
| 220 | } else if (crc_ok[0] && !crc_ok[1]) { |
| 221 | gd->env_valid = 1; |
| 222 | } |
| 223 | else if (!crc_ok[0] && crc_ok[1]) { |
| 224 | gd->env_valid = 2; |
| 225 | } else { |
| 226 | /* both ok - check serial */ |
| 227 | if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG) |
| 228 | gd->env_valid = 1; |
| 229 | else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG) |
| 230 | gd->env_valid = 2; |
| 231 | else if (flags[0] == 0xFF && flags[1] == 0) |
| 232 | gd->env_valid = 2; |
| 233 | else if(flags[1] == 0xFF && flags[0] == 0) |
| 234 | gd->env_valid = 1; |
| 235 | else /* flags are equal - almost impossible */ |
| 236 | gd->env_valid = 1; |
| 237 | } |
| 238 | |
| 239 | if (gd->env_valid == 2) |
| 240 | gd->env_addr = off_env[1] + offsetof(env_t,data); |
| 241 | else if (gd->env_valid == 1) |
| 242 | gd->env_addr = off_env[0] + offsetof(env_t,data); |
| 243 | |
| 244 | return (0); |
| 245 | } |
| 246 | #else |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 247 | int env_init(void) |
| 248 | { |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 249 | ulong crc, len, new; |
| 250 | unsigned off; |
| 251 | uchar buf[64]; |
| 252 | |
| 253 | eeprom_init (); /* prepare for EEPROM read/write */ |
| 254 | |
| 255 | /* read old CRC */ |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 256 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
Jean-Christophe PLAGNIOL-VILLARD | 0e8d158 | 2008-09-10 22:48:06 +0200 | [diff] [blame] | 257 | CONFIG_ENV_OFFSET+offsetof(env_t,crc), |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 258 | (uchar *)&crc, sizeof(ulong)); |
| 259 | |
| 260 | new = 0; |
| 261 | len = ENV_SIZE; |
| 262 | off = offsetof(env_t,data); |
| 263 | while (len > 0) { |
| 264 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; |
| 265 | |
Heiko Schocher | 548738b | 2010-01-07 08:55:40 +0100 | [diff] [blame] | 266 | eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR, |
| 267 | CONFIG_ENV_OFFSET + off, buf, n); |
wdenk | 0bc4a1a | 2002-09-18 11:09:59 +0000 | [diff] [blame] | 268 | new = crc32 (new, buf, n); |
| 269 | len -= n; |
| 270 | off += n; |
| 271 | } |
| 272 | |
| 273 | if (crc == new) { |
| 274 | gd->env_addr = offsetof(env_t,data); |
| 275 | gd->env_valid = 1; |
| 276 | } else { |
| 277 | gd->env_addr = 0; |
| 278 | gd->env_valid = 0; |
| 279 | } |
| 280 | |
| 281 | return (0); |
| 282 | } |
Heiko Schocher | 1567b59 | 2010-01-07 08:55:44 +0100 | [diff] [blame^] | 283 | #endif |
| 284 | |