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