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