common/env_flash.c

   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 /* #define DEBUG */
  28
  29 #include <common.h>
  30
  31 #if defined(CFG_ENV_IS_IN_FLASH) /* Environment is in Flash */
  32
  33 #include <command.h>
  34 #include <environment.h>
  35 #include <linux/stddef.h>
  36 #include <malloc.h>
  37
  38 #if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_FLASH)) == (CFG_CMD_ENV|CFG_CMD_FLASH))
  39 #define CMD_SAVEENV
  40 #elif defined(CFG_ENV_ADDR_REDUND)
  41 #error Cannot use CFG_ENV_ADDR_REDUND without CFG_CMD_ENV & CFG_CMD_FLASH
  42 #endif
  43
  44 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND < CFG_ENV_SIZE)
  45 #error CFG_ENV_SIZE_REDUND should not be less then CFG_ENV_SIZE
  46 #endif
  47
  48 #ifdef CONFIG_INFERNO
  49 # ifdef CFG_ENV_ADDR_REDUND
  50 #error CFG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
  51 # endif
  52 #endif
  53
  54 char * env_name_spec = "Flash";
  55
  56 #ifdef ENV_IS_EMBEDDED
  57
  58 extern uchar environment[];
  59 env_t *env_ptr = (env_t *)(&environment[0]);
  60
  61 #ifdef CMD_SAVEENV
  62 /* static env_t *flash_addr = (env_t *)(&environment[0]);-broken on ARM-wd-*/
  63 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  64 #endif
  65
  66 #else /* ! ENV_IS_EMBEDDED */
  67
  68 env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
  69 #ifdef CMD_SAVEENV
  70 static env_t *flash_addr = (env_t *)CFG_ENV_ADDR;
  71 #endif
  72
  73 #endif /* ENV_IS_EMBEDDED */
  74
  75 #ifdef CFG_ENV_ADDR_REDUND
  76 static env_t *flash_addr_new = (env_t *)CFG_ENV_ADDR_REDUND;
  77
  78 /* CFG_ENV_ADDR is supposed to be on sector boundary */
  79 static ulong end_addr = CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1;
  80 static ulong end_addr_new = CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1;
  81
  82 #define ACTIVE_FLAG   1
  83 #define OBSOLETE_FLAG 0
  84 #endif /* CFG_ENV_ADDR_REDUND */
  85
  86 extern uchar default_environment[];
  87 extern int default_environment_size;
  88
  89
  90 uchar env_get_char_spec (int index)
  91 {
  92         DECLARE_GLOBAL_DATA_PTR;
  93
  94         return ( *((uchar *)(gd->env_addr + index)) );
  95 }
  96
  97 #ifdef CFG_ENV_ADDR_REDUND
  98
  99 int  env_init(void)
 100 {
 101         DECLARE_GLOBAL_DATA_PTR;
 102         int crc1_ok = 0, crc2_ok = 0;
 103
 104         uchar flag1 = flash_addr->flags;
 105         uchar flag2 = flash_addr_new->flags;
 106
 107         ulong addr_default = (ulong)&default_environment[0];
 108         ulong addr1 = (ulong)&(flash_addr->data);
 109         ulong addr2 = (ulong)&(flash_addr_new->data);
 110
 111 #ifdef CONFIG_OMAP2420H4
 112         int flash_probe(void);
 113
 114         if(flash_probe() == 0)
 115                 goto bad_flash;
 116 #endif
 117
 118         crc1_ok = (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
 119         crc2_ok = (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
 120
 121         if (crc1_ok && ! crc2_ok) {
 122                 gd->env_addr  = addr1;
 123                 gd->env_valid = 1;
 124         } else if (! crc1_ok && crc2_ok) {
 125                 gd->env_addr  = addr2;
 126                 gd->env_valid = 1;
 127         } else if (! crc1_ok && ! crc2_ok) {
 128                 gd->env_addr  = addr_default;
 129                 gd->env_valid = 0;
 130         } else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 131                 gd->env_addr  = addr1;
 132                 gd->env_valid = 1;
 133         } else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 134                 gd->env_addr  = addr2;
 135                 gd->env_valid = 1;
 136         } else if (flag1 == flag2) {
 137                 gd->env_addr  = addr1;
 138                 gd->env_valid = 2;
 139         } else if (flag1 == 0xFF) {
 140                 gd->env_addr  = addr1;
 141                 gd->env_valid = 2;
 142         } else if (flag2 == 0xFF) {
 143                 gd->env_addr  = addr2;
 144                 gd->env_valid = 2;
 145         }
 146
 147 #ifdef CONFIG_OMAP2420H4
 148 bad_flash:
 149 #endif
 150         return (0);
 151 }
 152
 153 #ifdef CMD_SAVEENV
 154 int saveenv(void)
 155 {
 156         char *saved_data = NULL;
 157         int rc = 1;
 158         char flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 159 #if CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
 160         ulong up_data = 0;
 161 #endif
 162
 163         debug ("Protect off %08lX ... %08lX\n",
 164                 (ulong)flash_addr, end_addr);
 165
 166         if (flash_sect_protect (0, (ulong)flash_addr, end_addr)) {
 167                 goto Done;
 168         }
 169
 170         debug ("Protect off %08lX ... %08lX\n",
 171                 (ulong)flash_addr_new, end_addr_new);
 172
 173         if (flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new)) {
 174                 goto Done;
 175         }
 176
 177 #if CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
 178         up_data = (end_addr_new + 1 - ((long)flash_addr_new + CFG_ENV_SIZE));
 179         debug ("Data to save 0x%x\n", up_data);
 180         if (up_data) {
 181                 if ((saved_data = malloc(up_data)) == NULL) {
 182                         printf("Unable to save the rest of sector (%ld)\n",
 183                                 up_data);
 184                         goto Done;
 185                 }
 186                 memcpy(saved_data,
 187                         (void *)((long)flash_addr_new + CFG_ENV_SIZE), up_data);
 188                 debug ("Data (start 0x%x, len 0x%x) saved at 0x%x\n",
 189                            (long)flash_addr_new + CFG_ENV_SIZE,
 190                                 up_data, saved_data);
 191         }
 192 #endif
 193         puts ("Erasing Flash...");
 194         debug (" %08lX ... %08lX ...",
 195                 (ulong)flash_addr_new, end_addr_new);
 196
 197         if (flash_sect_erase ((ulong)flash_addr_new, end_addr_new)) {
 198                 goto Done;
 199         }
 200
 201         puts ("Writing to Flash... ");
 202         debug (" %08lX ... %08lX ...",
 203                 (ulong)&(flash_addr_new->data),
 204                 sizeof(env_ptr->data)+(ulong)&(flash_addr_new->data));
 205         if ((rc = flash_write((char *)env_ptr->data,
 206                         (ulong)&(flash_addr_new->data),
 207                         sizeof(env_ptr->data))) ||
 208             (rc = flash_write((char *)&(env_ptr->crc),
 209                         (ulong)&(flash_addr_new->crc),
 210                         sizeof(env_ptr->crc))) ||
 211             (rc = flash_write(&flag,
 212                         (ulong)&(flash_addr->flags),
 213                         sizeof(flash_addr->flags))) ||
 214             (rc = flash_write(&new_flag,
 215                         (ulong)&(flash_addr_new->flags),
 216                         sizeof(flash_addr_new->flags))))
 217         {
 218                 flash_perror (rc);
 219                 goto Done;
 220         }
 221         puts ("done\n");
 222
 223 #if CFG_ENV_SECT_SIZE > CFG_ENV_SIZE
 224         if (up_data) { /* restore the rest of sector */
 225                 debug ("Restoring the rest of data to 0x%x len 0x%x\n",
 226                            (long)flash_addr_new + CFG_ENV_SIZE, up_data);
 227                 if (flash_write(saved_data,
 228                                 (long)flash_addr_new + CFG_ENV_SIZE,
 229                                 up_data)) {
 230                         flash_perror(rc);
 231                         goto Done;
 232                 }
 233         }
 234 #endif
 235         {
 236                 env_t * etmp = flash_addr;
 237                 ulong ltmp = end_addr;
 238
 239                 flash_addr = flash_addr_new;
 240                 flash_addr_new = etmp;
 241
 242                 end_addr = end_addr_new;
 243                 end_addr_new = ltmp;
 244         }
 245
 246         rc = 0;
 247 Done:
 248
 249         if (saved_data)
 250                 free (saved_data);
 251         /* try to re-protect */
 252         (void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
 253         (void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 254
 255         return rc;
 256 }
 257 #endif /* CMD_SAVEENV */
 258
 259 #else /* ! CFG_ENV_ADDR_REDUND */
 260
 261 int  env_init(void)
 262 {
 263         DECLARE_GLOBAL_DATA_PTR;
 264 #ifdef CONFIG_OMAP2420H4
 265         int flash_probe(void);
 266
 267         if(flash_probe() == 0)
 268                 goto bad_flash;
 269 #endif
 270         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 271                 gd->env_addr  = (ulong)&(env_ptr->data);
 272                 gd->env_valid = 1;
 273                 return(0);
 274         }
 275 #ifdef CONFIG_OMAP2420H4
 276 bad_flash:
 277 #endif
 278         gd->env_addr  = (ulong)&default_environment[0];
 279         gd->env_valid = 0;
 280         return (0);
 281 }
 282
 283 #ifdef CMD_SAVEENV
 284
 285 int saveenv(void)
 286 {
 287         int     len, rc;
 288         ulong   end_addr;
 289         ulong   flash_sect_addr;
 290 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 291         ulong   flash_offset;
 292         uchar   env_buffer[CFG_ENV_SECT_SIZE];
 293 #else
 294         uchar *env_buffer = (uchar *)env_ptr;
 295 #endif  /* CFG_ENV_SECT_SIZE */
 296         int rcode = 0;
 297
 298 #if defined(CFG_ENV_SECT_SIZE) && (CFG_ENV_SECT_SIZE > CFG_ENV_SIZE)
 299
 300         flash_offset    = ((ulong)flash_addr) & (CFG_ENV_SECT_SIZE-1);
 301         flash_sect_addr = ((ulong)flash_addr) & ~(CFG_ENV_SECT_SIZE-1);
 302
 303         debug ( "copy old content: "
 304                 "sect_addr: %08lX  env_addr: %08lX  offset: %08lX\n",
 305                 flash_sect_addr, (ulong)flash_addr, flash_offset);
 306
 307         /* copy old contents to temporary buffer */
 308         memcpy (env_buffer, (void *)flash_sect_addr, CFG_ENV_SECT_SIZE);
 309
 310         /* copy current environment to temporary buffer */
 311         memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
 312                 env_ptr,
 313                 CFG_ENV_SIZE);
 314
 315         len      = CFG_ENV_SECT_SIZE;
 316 #else
 317         flash_sect_addr = (ulong)flash_addr;
 318         len      = CFG_ENV_SIZE;
 319 #endif  /* CFG_ENV_SECT_SIZE */
 320
 321 #ifndef CONFIG_INFERNO
 322         end_addr = flash_sect_addr + len - 1;
 323 #else
 324         /* this is the last sector, and the size is hardcoded here */
 325         /* otherwise we will get stack problems on loading 128 KB environment */
 326         end_addr = flash_sect_addr + 0x20000 - 1;
 327 #endif
 328
 329         debug ("Protect off %08lX ... %08lX\n",
 330                 (ulong)flash_sect_addr, end_addr);
 331
 332         if (flash_sect_protect (0, flash_sect_addr, end_addr))
 333                 return 1;
 334
 335         puts ("Erasing Flash...");
 336         if (flash_sect_erase (flash_sect_addr, end_addr))
 337                 return 1;
 338
 339         puts ("Writing to Flash... ");
 340         rc = flash_write((char *)env_buffer, flash_sect_addr, len);
 341         if (rc != 0) {
 342                 flash_perror (rc);
 343                 rcode = 1;
 344         } else {
 345                 puts ("done\n");
 346         }
 347
 348         /* try to re-protect */
 349         (void) flash_sect_protect (1, flash_sect_addr, end_addr);
 350         return rcode;
 351 }
 352
 353 #endif /* CMD_SAVEENV */
 354
 355 #endif /* CFG_ENV_ADDR_REDUND */
 356
 357 void env_relocate_spec (void)
 358 {
 359 #if !defined(ENV_IS_EMBEDDED) || defined(CFG_ENV_ADDR_REDUND)
 360 #ifdef CFG_ENV_ADDR_REDUND
 361         DECLARE_GLOBAL_DATA_PTR;
 362
 363         if (gd->env_addr != (ulong)&(flash_addr->data)) {
 364                 env_t * etmp = flash_addr;
 365                 ulong ltmp = end_addr;
 366
 367                 flash_addr = flash_addr_new;
 368                 flash_addr_new = etmp;
 369
 370                 end_addr = end_addr_new;
 371                 end_addr_new = ltmp;
 372         }
 373
 374         if (flash_addr_new->flags != OBSOLETE_FLAG &&
 375             crc32(0, flash_addr_new->data, ENV_SIZE) ==
 376             flash_addr_new->crc) {
 377                 char flag = OBSOLETE_FLAG;
 378
 379                 gd->env_valid = 2;
 380                 flash_sect_protect (0, (ulong)flash_addr_new, end_addr_new);
 381                 flash_write(&flag,
 382                             (ulong)&(flash_addr_new->flags),
 383                             sizeof(flash_addr_new->flags));
 384                 flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
 385         }
 386
 387         if (flash_addr->flags != ACTIVE_FLAG &&
 388             (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 389                 char flag = ACTIVE_FLAG;
 390
 391                 gd->env_valid = 2;
 392                 flash_sect_protect (0, (ulong)flash_addr, end_addr);
 393                 flash_write(&flag,
 394                             (ulong)&(flash_addr->flags),
 395                             sizeof(flash_addr->flags));
 396                 flash_sect_protect (1, (ulong)flash_addr, end_addr);
 397         }
 398
 399         if (gd->env_valid == 2)
 400                 puts ("*** Warning - some problems detected "
 401                       "reading environment; recovered successfully\n\n");
 402 #endif /* CFG_ENV_ADDR_REDUND */
 403         memcpy (env_ptr, (void*)flash_addr, CFG_ENV_SIZE);
 404 #endif /* ! ENV_IS_EMBEDDED || CFG_ENV_ADDR_REDUND */
 405 }
 406
 407 #endif /* CFG_ENV_IS_IN_FLASH */