board/esd/common/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <ppc4xx.h>
  26 #include <asm/processor.h>
  27
  28 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  29
  30 /*-----------------------------------------------------------------------
  31  * Functions
  32  */
  33 static int write_word (flash_info_t *info, ulong dest, ulong data);
  34
  35 /*-----------------------------------------------------------------------
  36  */
  37 static void flash_get_offsets (ulong base, flash_info_t *info)
  38 {
  39         int i;
  40         short n;
  41
  42         /* set up sector start address table */
  43         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
  44             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U)) {
  45             for (i = 0; i < info->sector_count; i++)
  46                 info->start[i] = base + (i * 0x00010000);
  47         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322B) ||
  48                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323B) ||
  49                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
  50                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324B)) {
  51                 /* set sector offsets for bottom boot block type        */
  52                 for (i=0; i<8; ++i) {           /*  8 x 8k boot sectors */
  53                         info->start[i] = base;
  54                         base += 8 << 10;
  55                 }
  56                 while (i < info->sector_count) {        /* 64k regular sectors  */
  57                         info->start[i] = base;
  58                         base += 64 << 10;
  59                         ++i;
  60                 }
  61         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322T) ||
  62                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323T) ||
  63                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
  64                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324T)) {
  65                 /* set sector offsets for top boot block type           */
  66                 base += info->size;
  67                 i = info->sector_count;
  68                 for (n=0; n<8; ++n) {           /*  8 x 8k boot sectors */
  69                         base -= 8 << 10;
  70                         --i;
  71                         info->start[i] = base;
  72                 }
  73                 while (i > 0) {                 /* 64k regular sectors  */
  74                         base -= 64 << 10;
  75                         --i;
  76                         info->start[i] = base;
  77                 }
  78         } else {
  79             if (info->flash_id & FLASH_BTYPE) {
  80                 /* set sector offsets for bottom boot block type        */
  81                 info->start[0] = base + 0x00000000;
  82                 info->start[1] = base + 0x00004000;
  83                 info->start[2] = base + 0x00006000;
  84                 info->start[3] = base + 0x00008000;
  85                 for (i = 4; i < info->sector_count; i++) {
  86                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
  87                 }
  88             } else {
  89                 /* set sector offsets for top boot block type           */
  90                 i = info->sector_count - 1;
  91                 info->start[i--] = base + info->size - 0x00004000;
  92                 info->start[i--] = base + info->size - 0x00006000;
  93                 info->start[i--] = base + info->size - 0x00008000;
  94                 for (; i >= 0; i--) {
  95                         info->start[i] = base + i * 0x00010000;
  96                 }
  97             }
  98         }
  99 }
 100
 101 /*-----------------------------------------------------------------------
 102  */
 103 void flash_print_info  (flash_info_t *info)
 104 {
 105         int i;
 106         int k;
 107         int size;
 108         int erased;
 109         volatile unsigned long *flash;
 110
 111         if (info->flash_id == FLASH_UNKNOWN) {
 112                 printf ("missing or unknown FLASH type\n");
 113                 return;
 114         }
 115
 116         switch (info->flash_id & FLASH_VENDMASK) {
 117         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 118         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 119         case FLASH_MAN_SST:     printf ("SST ");                break;
 120         case FLASH_MAN_EXCEL:   printf ("Excel Semiconductor "); break;
 121         default:                printf ("Unknown Vendor ");     break;
 122         }
 123
 124         switch (info->flash_id & FLASH_TYPEMASK) {
 125         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 126                                 break;
 127         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 128                                 break;
 129         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 130                                 break;
 131         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 132                                 break;
 133         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 134                                 break;
 135         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 136                                 break;
 137         case FLASH_AM320T:      printf ("AM29LV320T (32 M, top sector)\n");
 138                                 break;
 139         case FLASH_AM320B:      printf ("AM29LV320B (32 M, bottom sector)\n");
 140                                 break;
 141         case FLASH_AMDL322T:    printf ("AM29DL322T (32 M, top sector)\n");
 142                                 break;
 143         case FLASH_AMDL322B:    printf ("AM29DL322B (32 M, bottom sector)\n");
 144                                 break;
 145         case FLASH_AMDL323T:    printf ("AM29DL323T (32 M, top sector)\n");
 146                                 break;
 147         case FLASH_AMDL323B:    printf ("AM29DL323B (32 M, bottom sector)\n");
 148                                 break;
 149         case FLASH_AM640U:      printf ("AM29LV640D (64 M, uniform sector)\n");
 150                                 break;
 151         case FLASH_SST800A:     printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 152                                 break;
 153         case FLASH_SST160A:     printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 154                                 break;
 155         case FLASH_SST320:      printf ("SST39LF/VF320 (32 Mbit, uniform sector size)\n");
 156                                 break;
 157         case FLASH_SST640:      printf ("SST39LF/VF640 (64 Mbit, uniform sector size)\n");
 158                                 break;
 159         default:                printf ("Unknown Chip Type\n");
 160                                 break;
 161         }
 162
 163         printf ("  Size: %ld MB in %d Sectors\n",
 164                 info->size >> 20, info->sector_count);
 165
 166         printf ("  Sector Start Addresses:");
 167         for (i=0; i<info->sector_count; ++i) {
 168 #ifdef CFG_FLASH_EMPTY_INFO
 169                 /*
 170                  * Check if whole sector is erased
 171                  */
 172                 if (i != (info->sector_count-1))
 173                   size = info->start[i+1] - info->start[i];
 174                 else
 175                   size = info->start[0] + info->size - info->start[i];
 176                 erased = 1;
 177                 flash = (volatile unsigned long *)info->start[i];
 178                 size = size >> 2;        /* divide by 4 for longword access */
 179                 for (k=0; k<size; k++)
 180                   {
 181                     if (*flash++ != 0xffffffff)
 182                       {
 183                         erased = 0;
 184                         break;
 185                       }
 186                   }
 187
 188                 if ((i % 5) == 0)
 189                         printf ("\n   ");
 190                 /* print empty and read-only info */
 191                 printf (" %08lX%s%s",
 192                         info->start[i],
 193                         erased ? " E" : "  ",
 194                         info->protect[i] ? "RO " : "   ");
 195 #else
 196                 if ((i % 5) == 0)
 197                         printf ("\n   ");
 198                 printf (" %08lX%s",
 199                         info->start[i],
 200                         info->protect[i] ? " (RO)" : "     ");
 201 #endif
 202
 203         }
 204         printf ("\n");
 205         return;
 206 }
 207
 208 /*-----------------------------------------------------------------------
 209  */
 210
 211
 212 /*-----------------------------------------------------------------------
 213  */
 214
 215 /*
 216  * The following code cannot be run from FLASH!
 217  */
 218 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 219 {
 220         short i;
 221         short n;
 222         CFG_FLASH_WORD_SIZE value;
 223         ulong base = (ulong)addr;
 224         volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)addr;
 225
 226         /* Write auto select command: read Manufacturer ID */
 227         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 228         addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 229         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;
 230
 231         value = addr2[CFG_FLASH_READ0];
 232
 233         switch (value) {
 234         case (CFG_FLASH_WORD_SIZE)AMD_MANUFACT:
 235                 info->flash_id = FLASH_MAN_AMD;
 236                 break;
 237         case (CFG_FLASH_WORD_SIZE)FUJ_MANUFACT:
 238                 info->flash_id = FLASH_MAN_FUJ;
 239                 break;
 240         case (CFG_FLASH_WORD_SIZE)SST_MANUFACT:
 241                 info->flash_id = FLASH_MAN_SST;
 242                 break;
 243         case (CFG_FLASH_WORD_SIZE)EXCEL_MANUFACT:
 244                 info->flash_id = FLASH_MAN_EXCEL;
 245                 break;
 246         default:
 247                 info->flash_id = FLASH_UNKNOWN;
 248                 info->sector_count = 0;
 249                 info->size = 0;
 250                 return (0);                     /* no or unknown flash  */
 251         }
 252
 253         value = addr2[CFG_FLASH_READ1];         /* device ID            */
 254
 255         switch (value) {
 256         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400T:
 257                 info->flash_id += FLASH_AM400T;
 258                 info->sector_count = 11;
 259                 info->size = 0x00080000;
 260                 break;                          /* => 0.5 MB            */
 261
 262         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400B:
 263                 info->flash_id += FLASH_AM400B;
 264                 info->sector_count = 11;
 265                 info->size = 0x00080000;
 266                 break;                          /* => 0.5 MB            */
 267
 268         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800T:
 269                 info->flash_id += FLASH_AM800T;
 270                 info->sector_count = 19;
 271                 info->size = 0x00100000;
 272                 break;                          /* => 1 MB              */
 273
 274         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800B:
 275                 info->flash_id += FLASH_AM800B;
 276                 info->sector_count = 19;
 277                 info->size = 0x00100000;
 278                 break;                          /* => 1 MB              */
 279
 280         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160T:
 281                 info->flash_id += FLASH_AM160T;
 282                 info->sector_count = 35;
 283                 info->size = 0x00200000;
 284                 break;                          /* => 2 MB              */
 285
 286         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160B:
 287                 info->flash_id += FLASH_AM160B;
 288                 info->sector_count = 35;
 289                 info->size = 0x00200000;
 290                 break;                          /* => 2 MB              */
 291
 292         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320T:
 293                 info->flash_id += FLASH_AM320T;
 294                 info->sector_count = 71;
 295                 info->size = 0x00400000;  break;        /* => 4 MB      */
 296
 297         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320B:
 298                 info->flash_id += FLASH_AM320B;
 299                 info->sector_count = 71;
 300                 info->size = 0x00400000;  break;        /* => 4 MB      */
 301
 302         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322T:
 303                 info->flash_id += FLASH_AMDL322T;
 304                 info->sector_count = 71;
 305                 info->size = 0x00400000;  break;        /* => 4 MB      */
 306
 307         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322B:
 308                 info->flash_id += FLASH_AMDL322B;
 309                 info->sector_count = 71;
 310                 info->size = 0x00400000;  break;        /* => 4 MB      */
 311
 312         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323T:
 313                 info->flash_id += FLASH_AMDL323T;
 314                 info->sector_count = 71;
 315                 info->size = 0x00400000;  break;        /* => 4 MB      */
 316
 317         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323B:
 318                 info->flash_id += FLASH_AMDL323B;
 319                 info->sector_count = 71;
 320                 info->size = 0x00400000;  break;        /* => 4 MB      */
 321
 322         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV640U:
 323                 info->flash_id += FLASH_AM640U;
 324                 info->sector_count = 128;
 325                 info->size = 0x00800000;  break;        /* => 8 MB      */
 326
 327 #if !(defined(CONFIG_ADCIOP) || defined(CONFIG_DASA_SIM))
 328         case (CFG_FLASH_WORD_SIZE)SST_ID_xF800A:
 329                 info->flash_id += FLASH_SST800A;
 330                 info->sector_count = 16;
 331                 info->size = 0x00100000;
 332                 break;                          /* => 1 MB              */
 333
 334         case (CFG_FLASH_WORD_SIZE)SST_ID_xF160A:
 335         case (CFG_FLASH_WORD_SIZE)SST_ID_xF1601:
 336         case (CFG_FLASH_WORD_SIZE)SST_ID_xF1602:
 337                 info->flash_id += FLASH_SST160A;
 338                 info->sector_count = 32;
 339                 info->size = 0x00200000;
 340                 break;                          /* => 2 MB              */
 341
 342         case (CFG_FLASH_WORD_SIZE)SST_ID_xF3201:
 343         case (CFG_FLASH_WORD_SIZE)SST_ID_xF3202:
 344                 info->flash_id += FLASH_SST320;
 345                 info->sector_count = 64;
 346                 info->size = 0x00400000;
 347                 break;                          /* => 4 MB              */
 348
 349         case (CFG_FLASH_WORD_SIZE)SST_ID_xF6401:
 350         case (CFG_FLASH_WORD_SIZE)SST_ID_xF6402:
 351                 info->flash_id += FLASH_SST640;
 352                 info->sector_count = 128;
 353                 info->size = 0x00800000;
 354                 break;                          /* => 8 MB              */
 355 #endif
 356
 357         default:
 358                 info->flash_id = FLASH_UNKNOWN;
 359                 return (0);                     /* => no or unknown flash */
 360
 361         }
 362
 363         /* set up sector start address table */
 364         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 365             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U)) {
 366             for (i = 0; i < info->sector_count; i++)
 367                 info->start[i] = base + (i * 0x00010000);
 368         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322B) ||
 369                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323B) ||
 370                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
 371                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324B)) {
 372                 /* set sector offsets for bottom boot block type        */
 373                 for (i=0; i<8; ++i) {           /*  8 x 8k boot sectors */
 374                         info->start[i] = base;
 375                         base += 8 << 10;
 376                 }
 377                 while (i < info->sector_count) {        /* 64k regular sectors  */
 378                         info->start[i] = base;
 379                         base += 64 << 10;
 380                         ++i;
 381                 }
 382         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322T) ||
 383                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323T) ||
 384                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
 385                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324T)) {
 386                 /* set sector offsets for top boot block type           */
 387                 base += info->size;
 388                 i = info->sector_count;
 389                 for (n=0; n<8; ++n) {           /*  8 x 8k boot sectors */
 390                         base -= 8 << 10;
 391                         --i;
 392                         info->start[i] = base;
 393                 }
 394                 while (i > 0) {                 /* 64k regular sectors  */
 395                         base -= 64 << 10;
 396                         --i;
 397                         info->start[i] = base;
 398                 }
 399         } else {
 400             if (info->flash_id & FLASH_BTYPE) {
 401                 /* set sector offsets for bottom boot block type        */
 402                 info->start[0] = base + 0x00000000;
 403                 info->start[1] = base + 0x00004000;
 404                 info->start[2] = base + 0x00006000;
 405                 info->start[3] = base + 0x00008000;
 406                 for (i = 4; i < info->sector_count; i++) {
 407                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 408                 }
 409             } else {
 410                 /* set sector offsets for top boot block type           */
 411                 i = info->sector_count - 1;
 412                 info->start[i--] = base + info->size - 0x00004000;
 413                 info->start[i--] = base + info->size - 0x00006000;
 414                 info->start[i--] = base + info->size - 0x00008000;
 415                 for (; i >= 0; i--) {
 416                         info->start[i] = base + i * 0x00010000;
 417                 }
 418             }
 419         }
 420
 421         /* check for protected sectors */
 422         for (i = 0; i < info->sector_count; i++) {
 423                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 424                 /* D0 = 1 if protected */
 425                 addr2 = (volatile CFG_FLASH_WORD_SIZE *)(info->start[i]);
 426                 if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_AMD)
 427                   info->protect[i] = 0;
 428                 else
 429                   info->protect[i] = addr2[CFG_FLASH_READ2] & 1;
 430         }
 431
 432         /*
 433          * Prevent writes to uninitialized FLASH.
 434          */
 435         if (info->flash_id != FLASH_UNKNOWN) {
 436                 addr2 = (CFG_FLASH_WORD_SIZE *)info->start[0];
 437                 *addr2 = (CFG_FLASH_WORD_SIZE)0x00F000F0;       /* reset bank */
 438         }
 439
 440         return (info->size);
 441 }
 442
 443
 444 /*-----------------------------------------------------------------------
 445  */
 446
 447 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 448 {
 449         volatile CFG_FLASH_WORD_SIZE *addr = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 450         volatile CFG_FLASH_WORD_SIZE *addr2;
 451         int flag, prot, sect, l_sect;
 452         ulong start, now, last;
 453         int i;
 454
 455         if ((s_first < 0) || (s_first > s_last)) {
 456                 if (info->flash_id == FLASH_UNKNOWN) {
 457                         printf ("- missing\n");
 458                 } else {
 459                         printf ("- no sectors to erase\n");
 460                 }
 461                 return 1;
 462         }
 463
 464         if (info->flash_id == FLASH_UNKNOWN) {
 465                 printf ("Can't erase unknown flash type - aborted\n");
 466                 return 1;
 467         }
 468
 469         prot = 0;
 470         for (sect=s_first; sect<=s_last; ++sect) {
 471                 if (info->protect[sect]) {
 472                         prot++;
 473                 }
 474         }
 475
 476         if (prot) {
 477                 printf ("- Warning: %d protected sectors will not be erased!\n",
 478                         prot);
 479         } else {
 480                 printf ("\n");
 481         }
 482
 483         l_sect = -1;
 484
 485         /* Disable interrupts which might cause a timeout here */
 486         flag = disable_interrupts();
 487
 488         /* Start erase on unprotected sectors */
 489         for (sect = s_first; sect<=s_last; sect++) {
 490                 if (info->protect[sect] == 0) { /* not protected */
 491                     addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[sect]);
 492                     if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 493                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 494                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 495                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 496                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 497                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 498                         addr2[0] = (CFG_FLASH_WORD_SIZE)0x00500050;  /* block erase */
 499                         for (i=0; i<50; i++)
 500                           udelay(1000);  /* wait 1 ms */
 501                     } else {
 502                         if (sect == s_first) {
 503                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 504                             addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 505                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 506                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 507                             addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 508                         }
 509                         addr2[0] = (CFG_FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 510                     }
 511                     l_sect = sect;
 512                 }
 513         }
 514
 515         /* re-enable interrupts if necessary */
 516         if (flag)
 517                 enable_interrupts();
 518
 519         /* wait at least 80us - let's wait 1 ms */
 520         udelay (1000);
 521
 522         /*
 523          * We wait for the last triggered sector
 524          */
 525         if (l_sect < 0)
 526                 goto DONE;
 527
 528         start = get_timer (0);
 529         last  = start;
 530         addr = (CFG_FLASH_WORD_SIZE *)(info->start[l_sect]);
 531         while ((addr[0] & (CFG_FLASH_WORD_SIZE)0x00800080) != (CFG_FLASH_WORD_SIZE)0x00800080) {
 532                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 533                         printf ("Timeout\n");
 534                         return 1;
 535                 }
 536                 /* show that we're waiting */
 537                 if ((now - last) > 1000) {      /* every second */
 538                         putc ('.');
 539                         last = now;
 540                 }
 541         }
 542
 543 DONE:
 544         /* reset to read mode */
 545         addr = (CFG_FLASH_WORD_SIZE *)info->start[0];
 546         addr[0] = (CFG_FLASH_WORD_SIZE)0x00F000F0;      /* reset bank */
 547
 548         printf (" done\n");
 549         return 0;
 550 }
 551
 552 /*-----------------------------------------------------------------------
 553  * Copy memory to flash, returns:
 554  * 0 - OK
 555  * 1 - write timeout
 556  * 2 - Flash not erased
 557  */
 558
 559 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 560 {
 561         ulong cp, wp, data;
 562         int i, l, rc;
 563
 564         wp = (addr & ~3);       /* get lower word aligned address */
 565
 566         /*
 567          * handle unaligned start bytes
 568          */
 569         if ((l = addr - wp) != 0) {
 570                 data = 0;
 571                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 572                         data = (data << 8) | (*(uchar *)cp);
 573                 }
 574                 for (; i<4 && cnt>0; ++i) {
 575                         data = (data << 8) | *src++;
 576                         --cnt;
 577                         ++cp;
 578                 }
 579                 for (; cnt==0 && i<4; ++i, ++cp) {
 580                         data = (data << 8) | (*(uchar *)cp);
 581                 }
 582
 583                 if ((rc = write_word(info, wp, data)) != 0) {
 584                         return (rc);
 585                 }
 586                 wp += 4;
 587         }
 588
 589         /*
 590          * handle word aligned part
 591          */
 592         while (cnt >= 4) {
 593                 data = 0;
 594                 for (i=0; i<4; ++i) {
 595                         data = (data << 8) | *src++;
 596                 }
 597                 if ((rc = write_word(info, wp, data)) != 0) {
 598                         return (rc);
 599                 }
 600                 wp  += 4;
 601                 cnt -= 4;
 602         }
 603
 604         if (cnt == 0) {
 605                 return (0);
 606         }
 607
 608         /*
 609          * handle unaligned tail bytes
 610          */
 611         data = 0;
 612         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 613                 data = (data << 8) | *src++;
 614                 --cnt;
 615         }
 616         for (; i<4; ++i, ++cp) {
 617                 data = (data << 8) | (*(uchar *)cp);
 618         }
 619
 620         return (write_word(info, wp, data));
 621 }
 622
 623 /*-----------------------------------------------------------------------
 624  * Write a word to Flash, returns:
 625  * 0 - OK
 626  * 1 - write timeout
 627  * 2 - Flash not erased
 628  */
 629 static int write_word (flash_info_t *info, ulong dest, ulong data)
 630 {
 631         volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 632         volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
 633         volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)&data;
 634         ulong start;
 635         int flag;
 636         int i;
 637
 638         /* Check if Flash is (sufficiently) erased */
 639         if ((*((vu_long *)dest) & data) != data) {
 640                 return (2);
 641         }
 642
 643         /* Disable interrupts which might cause a timeout here */
 644         flag = disable_interrupts();
 645
 646         for (i=0; i<4/sizeof(CFG_FLASH_WORD_SIZE); i++)
 647           {
 648             addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 649             addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 650             addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00A000A0;
 651
 652             dest2[i] = data2[i];
 653
 654             /* re-enable interrupts if necessary */
 655             if (flag)
 656               enable_interrupts();
 657
 658             /* data polling for D7 */
 659             start = get_timer (0);
 660             while ((dest2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
 661                    (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080)) {
 662               if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 663                 return (1);
 664               }
 665             }
 666           }
 667
 668         return (0);
 669 }
 670
 671 /*-----------------------------------------------------------------------
 672  */