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