board/jse/flash.c

   1 /*
   2  * (C) Copyright 2000-2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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 /*
  25  * Modified 4/5/2001
  26  * Wait for completion of each sector erase command issued
  27  * 4/5/2001
  28  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  29  */
  30
  31 #include <common.h>
  32 #include <ppc4xx.h>
  33 #include <asm/processor.h>
  34
  35 #if CFG_MAX_FLASH_BANKS != 1
  36 #error "CFG_MAX_FLASH_BANKS must be 1"
  37 #endif
  38 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];   /* info for FLASH chips        */
  39
  40 /*-----------------------------------------------------------------------
  41  * Functions
  42  */
  43 static ulong flash_get_size (vu_long * addr, flash_info_t * info);
  44 static int write_word (flash_info_t * info, ulong dest, ulong data);
  45 static void flash_get_offsets (ulong base, flash_info_t * info);
  46
  47 #define ADDR0           0x5555
  48 #define ADDR1           0x2aaa
  49 #define FLASH_WORD_SIZE unsigned char
  50
  51 /*-----------------------------------------------------------------------
  52  */
  53
  54 unsigned long flash_init (void)
  55 {
  56         unsigned long size_b0;
  57         unsigned long base_b0;
  58
  59         /* Init: no FLASHes known */
  60         flash_info[0].flash_id = FLASH_UNKNOWN;
  61
  62         /* Static FLASH Bank configuration here - FIXME XXX */
  63
  64         size_b0 =
  65                 flash_get_size ((vu_long *) FLASH_BASE0_PRELIM,
  66                                 &flash_info[0]);
  67
  68         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  69                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n", size_b0, size_b0 << 20);
  70         }
  71
  72         /* Only one bank */
  73         /* Setup offsets */
  74         flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
  75
  76         /* Monitor protection ON by default */
  77         (void) flash_protect (FLAG_PROTECT_SET,
  78                               FLASH_BASE0_PRELIM,
  79                               FLASH_BASE0_PRELIM + monitor_flash_len - 1,
  80                               &flash_info[0]);
  81         flash_info[0].size = size_b0;
  82
  83         return size_b0;
  84 }
  85
  86
  87 /*-----------------------------------------------------------------------
  88  */
  89 static void flash_get_offsets (ulong base, flash_info_t * info)
  90 {
  91         int i;
  92
  93         /* set up sector start address table */
  94         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
  95             (info->flash_id == FLASH_AM040)) {
  96                 for (i = 0; i < info->sector_count; i++)
  97                         info->start[i] = base + (i * 0x00010000);
  98         } else {
  99                 if (info->flash_id & FLASH_BTYPE) {
 100                         /* set sector offsets for bottom boot block type        */
 101                         info->start[0] = base + 0x00000000;
 102                         info->start[1] = base + 0x00004000;
 103                         info->start[2] = base + 0x00006000;
 104                         info->start[3] = base + 0x00008000;
 105                         for (i = 4; i < info->sector_count; i++) {
 106                                 info->start[i] =
 107                                         base + (i * 0x00010000) - 0x00030000;
 108                         }
 109                 } else {
 110                         /* set sector offsets for top boot block type           */
 111                         i = info->sector_count - 1;
 112                         info->start[i--] = base + info->size - 0x00004000;
 113                         info->start[i--] = base + info->size - 0x00006000;
 114                         info->start[i--] = base + info->size - 0x00008000;
 115                         for (; i >= 0; i--) {
 116                                 info->start[i] = base + i * 0x00010000;
 117                         }
 118                 }
 119         }
 120 }
 121
 122 /*-----------------------------------------------------------------------
 123  */
 124 void flash_print_info (flash_info_t * info)
 125 {
 126         int i;
 127         int k;
 128         int size;
 129         int erased;
 130         volatile unsigned long *flash;
 131
 132         if (info->flash_id == FLASH_UNKNOWN) {
 133                 printf ("missing or unknown FLASH type\n");
 134                 return;
 135         }
 136
 137         switch (info->flash_id & FLASH_VENDMASK) {
 138         case FLASH_MAN_AMD:
 139                 printf ("AMD ");
 140                 break;
 141         case FLASH_MAN_FUJ:
 142                 printf ("FUJITSU ");
 143                 break;
 144         case FLASH_MAN_SST:
 145                 printf ("SST ");
 146                 break;
 147         default:
 148                 printf ("Unknown Vendor ");
 149                 break;
 150         }
 151
 152         switch (info->flash_id & FLASH_TYPEMASK) {
 153         case FLASH_AM040:
 154                 printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 155                 break;
 156         case FLASH_AM400B:
 157                 printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 158                 break;
 159         case FLASH_AM400T:
 160                 printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 161                 break;
 162         case FLASH_AM800B:
 163                 printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 164                 break;
 165         case FLASH_AM800T:
 166                 printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 167                 break;
 168         case FLASH_AM160B:
 169                 printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 170                 break;
 171         case FLASH_AM160T:
 172                 printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 173                 break;
 174         case FLASH_AM320B:
 175                 printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 176                 break;
 177         case FLASH_AM320T:
 178                 printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 179                 break;
 180         case FLASH_SST800A:
 181                 printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 182                 break;
 183         case FLASH_SST160A:
 184                 printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 185                 break;
 186         default:
 187                 printf ("Unknown Chip Type\n");
 188                 break;
 189         }
 190
 191         printf ("  Size: %ld KB in %d Sectors\n",
 192                 info->size >> 10, info->sector_count);
 193
 194         printf ("  Sector Start Addresses:");
 195         for (i = 0; i < info->sector_count; ++i) {
 196                 /*
 197                  * Check if whole sector is erased
 198                  */
 199                 if (i != (info->sector_count - 1))
 200                         size = info->start[i + 1] - info->start[i];
 201                 else
 202                         size = info->start[0] + info->size - info->start[i];
 203                 erased = 1;
 204                 flash = (volatile unsigned long *) info->start[i];
 205                 size = size >> 2;       /* divide by 4 for longword access */
 206                 for (k = 0; k < size; k++) {
 207                         if (*flash++ != 0xffffffff) {
 208                                 erased = 0;
 209                                 break;
 210                         }
 211                 }
 212
 213                 if ((i % 5) == 0)
 214                         printf ("\n   ");
 215 #if 0                           /* test-only */
 216                 printf (" %08lX%s",
 217                         info->start[i], info->protect[i] ? " (RO)" : "     "
 218 #else
 219                 printf (" %08lX%s%s",
 220                         info->start[i],
 221                         erased ? " E" : "  ", info->protect[i] ? "RO " : "   "
 222 #endif
 223                         );
 224         }
 225         printf ("\n");
 226         return;
 227 }
 228
 229 /*-----------------------------------------------------------------------
 230  */
 231
 232
 233 /*-----------------------------------------------------------------------
 234  */
 235
 236 /*
 237  * The following code cannot be run from FLASH!
 238  */
 239 static ulong flash_get_size (vu_long * addr, flash_info_t * info)
 240 {
 241         short i;
 242         FLASH_WORD_SIZE value;
 243         ulong base = (ulong) addr;
 244         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;
 245
 246         /* Write auto select command: read Manufacturer ID */
 247         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 248         addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 249         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
 250
 251 #ifdef CONFIG_ADCIOP
 252         value = addr2[2];
 253 #else
 254         value = addr2[0];
 255 #endif
 256
 257         switch (value) {
 258         case (FLASH_WORD_SIZE) AMD_MANUFACT:
 259                 info->flash_id = FLASH_MAN_AMD;
 260                 break;
 261         case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 262                 info->flash_id = FLASH_MAN_FUJ;
 263                 break;
 264         case (FLASH_WORD_SIZE) SST_MANUFACT:
 265                 info->flash_id = FLASH_MAN_SST;
 266                 break;
 267         default:
 268                 info->flash_id = FLASH_UNKNOWN;
 269                 info->sector_count = 0;
 270                 info->size = 0;
 271                 return (0);     /* no or unknown flash  */
 272         }
 273
 274 #ifdef CONFIG_ADCIOP
 275         value = addr2[0];       /* device ID            */
 276         /*        printf("\ndev_code=%x\n", value); */
 277 #else
 278         value = addr2[1];       /* device ID            */
 279 #endif
 280
 281         switch (value) {
 282         case (FLASH_WORD_SIZE) AMD_ID_F040B:
 283                 info->flash_id += FLASH_AM040;
 284                 info->sector_count = 8;
 285                 info->size = 0x0080000; /* => 512 ko */
 286                 break;
 287         case (FLASH_WORD_SIZE) AMD_ID_LV040B:
 288                 info->flash_id += FLASH_AM040;
 289                 info->sector_count = 8;
 290                 info->size = 0x0080000; /* => 512 ko */
 291                 break;
 292         case (FLASH_WORD_SIZE) AMD_ID_LV400T:
 293                 info->flash_id += FLASH_AM400T;
 294                 info->sector_count = 11;
 295                 info->size = 0x00080000;
 296                 break;          /* => 0.5 MB            */
 297
 298         case (FLASH_WORD_SIZE) AMD_ID_LV400B:
 299                 info->flash_id += FLASH_AM400B;
 300                 info->sector_count = 11;
 301                 info->size = 0x00080000;
 302                 break;          /* => 0.5 MB            */
 303
 304         case (FLASH_WORD_SIZE) AMD_ID_LV800T:
 305                 info->flash_id += FLASH_AM800T;
 306                 info->sector_count = 19;
 307                 info->size = 0x00100000;
 308                 break;          /* => 1 MB              */
 309
 310         case (FLASH_WORD_SIZE) AMD_ID_LV800B:
 311                 info->flash_id += FLASH_AM800B;
 312                 info->sector_count = 19;
 313                 info->size = 0x00100000;
 314                 break;          /* => 1 MB              */
 315
 316         case (FLASH_WORD_SIZE) AMD_ID_LV160T:
 317                 info->flash_id += FLASH_AM160T;
 318                 info->sector_count = 35;
 319                 info->size = 0x00200000;
 320                 break;          /* => 2 MB              */
 321
 322         case (FLASH_WORD_SIZE) AMD_ID_LV160B:
 323                 info->flash_id += FLASH_AM160B;
 324                 info->sector_count = 35;
 325                 info->size = 0x00200000;
 326                 break;          /* => 2 MB              */
 327 #if 0                           /* enable when device IDs are available */
 328         case (FLASH_WORD_SIZE) AMD_ID_LV320T:
 329                 info->flash_id += FLASH_AM320T;
 330                 info->sector_count = 67;
 331                 info->size = 0x00400000;
 332                 break;          /* => 4 MB              */
 333
 334         case (FLASH_WORD_SIZE) AMD_ID_LV320B:
 335                 info->flash_id += FLASH_AM320B;
 336                 info->sector_count = 67;
 337                 info->size = 0x00400000;
 338                 break;          /* => 4 MB              */
 339 #endif
 340         case (FLASH_WORD_SIZE) SST_ID_xF800A:
 341                 info->flash_id += FLASH_SST800A;
 342                 info->sector_count = 16;
 343                 info->size = 0x00100000;
 344                 break;          /* => 1 MB              */
 345
 346         case (FLASH_WORD_SIZE) SST_ID_xF160A:
 347                 info->flash_id += FLASH_SST160A;
 348                 info->sector_count = 32;
 349                 info->size = 0x00200000;
 350                 break;          /* => 2 MB              */
 351
 352         default:
 353                 info->flash_id = FLASH_UNKNOWN;
 354                 return (0);     /* => no or unknown flash */
 355
 356         }
 357
 358         /* set up sector start address table */
 359         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 360             (info->flash_id == FLASH_AM040)) {
 361                 for (i = 0; i < info->sector_count; i++)
 362                         info->start[i] = base + (i * 0x00010000);
 363         } else {
 364                 if (info->flash_id & FLASH_BTYPE) {
 365                         /* set sector offsets for bottom boot block type        */
 366                         info->start[0] = base + 0x00000000;
 367                         info->start[1] = base + 0x00004000;
 368                         info->start[2] = base + 0x00006000;
 369                         info->start[3] = base + 0x00008000;
 370                         for (i = 4; i < info->sector_count; i++) {
 371                                 info->start[i] =
 372                                         base + (i * 0x00010000) - 0x00030000;
 373                         }
 374                 } else {
 375                         /* set sector offsets for top boot block type           */
 376                         i = info->sector_count - 1;
 377                         info->start[i--] = base + info->size - 0x00004000;
 378                         info->start[i--] = base + info->size - 0x00006000;
 379                         info->start[i--] = base + info->size - 0x00008000;
 380                         for (; i >= 0; i--) {
 381                                 info->start[i] = base + i * 0x00010000;
 382                         }
 383                 }
 384         }
 385
 386         /* check for protected sectors */
 387         for (i = 0; i < info->sector_count; i++) {
 388                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 389                 /* D0 = 1 if protected */
 390 #ifdef CONFIG_ADCIOP
 391                 addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 392                 info->protect[i] = addr2[4] & 1;
 393 #else
 394                 addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 395                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 396                         info->protect[i] = 0;
 397                 else
 398                         info->protect[i] = addr2[2] & 1;
 399 #endif
 400         }
 401
 402         /*
 403          * Prevent writes to uninitialized FLASH.
 404          */
 405         if (info->flash_id != FLASH_UNKNOWN) {
 406 #if 0                           /* test-only */
 407 #ifdef CONFIG_ADCIOP
 408                 addr2 = (volatile unsigned char *) info->start[0];
 409                 addr2[ADDR0] = 0xAA;
 410                 addr2[ADDR1] = 0x55;
 411                 addr2[ADDR0] = 0xF0;    /* reset bank */
 412 #else
 413                 addr2 = (FLASH_WORD_SIZE *) info->start[0];
 414                 *addr2 = (FLASH_WORD_SIZE) 0x00F000F0;  /* reset bank */
 415 #endif
 416 #else  /* test-only */
 417                 addr2 = (FLASH_WORD_SIZE *) info->start[0];
 418                 *addr2 = (FLASH_WORD_SIZE) 0x00F000F0;  /* reset bank */
 419 #endif /* test-only */
 420         }
 421
 422         return (info->size);
 423 }
 424
 425 int wait_for_DQ7 (flash_info_t * info, int sect)
 426 {
 427         ulong start, now, last;
 428         volatile FLASH_WORD_SIZE *addr =
 429                 (FLASH_WORD_SIZE *) (info->start[sect]);
 430
 431         start = get_timer (0);
 432         last = start;
 433         while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 434                (FLASH_WORD_SIZE) 0x00800080) {
 435                 if ((now = get_timer (start)) > CFG_FLASH_ERASE_TOUT) {
 436                         printf ("Timeout\n");
 437                         return -1;
 438                 }
 439                 /* show that we're waiting */
 440                 if ((now - last) > 1000) {      /* every second */
 441                         putc ('.');
 442                         last = now;
 443                 }
 444         }
 445         return 0;
 446 }
 447
 448 /*-----------------------------------------------------------------------
 449  */
 450
 451 int flash_erase (flash_info_t * info, int s_first, int s_last)
 452 {
 453         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 454         volatile FLASH_WORD_SIZE *addr2;
 455         int flag, prot, sect, l_sect;
 456         int i;
 457
 458         if ((s_first < 0) || (s_first > s_last)) {
 459                 if (info->flash_id == FLASH_UNKNOWN) {
 460                         printf ("- missing\n");
 461                 } else {
 462                         printf ("- no sectors to erase\n");
 463                 }
 464                 return 1;
 465         }
 466
 467         if (info->flash_id == FLASH_UNKNOWN) {
 468                 printf ("Can't erase unknown flash type - aborted\n");
 469                 return 1;
 470         }
 471
 472         prot = 0;
 473         for (sect = s_first; sect <= s_last; ++sect) {
 474                 if (info->protect[sect]) {
 475                         prot++;
 476                 }
 477         }
 478
 479         if (prot) {
 480                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 481         } else {
 482                 printf ("\n");
 483         }
 484
 485         l_sect = -1;
 486
 487         /* Disable interrupts which might cause a timeout here */
 488         flag = disable_interrupts ();
 489
 490         /* Start erase on unprotected sectors */
 491         for (sect = s_first; sect <= s_last; sect++) {
 492                 if (info->protect[sect] == 0) { /* not protected */
 493                         addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
 494                         printf ("Erasing sector %p\n", addr2);  /* CLH */
 495
 496                         if ((info->flash_id & FLASH_VENDMASK) ==
 497                             FLASH_MAN_SST) {
 498                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 499                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 500                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 501                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 502                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 503                                 addr2[0] = (FLASH_WORD_SIZE) 0x00500050;        /* block erase */
 504                                 for (i = 0; i < 50; i++)
 505                                         udelay (1000);  /* wait 1 ms */
 506                         } else {
 507                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 508                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 509                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 510                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 511                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 512                                 addr2[0] = (FLASH_WORD_SIZE) 0x00300030;        /* sector erase */
 513                         }
 514                         l_sect = sect;
 515                         /*
 516                          * Wait for each sector to complete, it's more
 517                          * reliable.  According to AMD Spec, you must
 518                          * issue all erase commands within a specified
 519                          * timeout.  This has been seen to fail, especially
 520                          * if printf()s are included (for debug)!!
 521                          */
 522                         wait_for_DQ7 (info, sect);
 523                 }
 524         }
 525
 526         /* re-enable interrupts if necessary */
 527         if (flag)
 528                 enable_interrupts ();
 529
 530         /* wait at least 80us - let's wait 1 ms */
 531         udelay (1000);
 532
 533 #if 0
 534         /*
 535          * We wait for the last triggered sector
 536          */
 537         if (l_sect < 0)
 538                 goto DONE;
 539         wait_for_DQ7 (info, l_sect);
 540
 541       DONE:
 542 #endif
 543         /* reset to read mode */
 544         addr = (FLASH_WORD_SIZE *) info->start[0];
 545         addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */
 546
 547         printf (" done\n");
 548         return 0;
 549 }
 550
 551 /*-----------------------------------------------------------------------
 552  * Copy memory to flash, returns:
 553  * 0 - OK
 554  * 1 - write timeout
 555  * 2 - Flash not erased
 556  */
 557
 558 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 559 {
 560         ulong cp, wp, data;
 561         int i, l, rc;
 562
 563         wp = (addr & ~3);       /* get lower word aligned address */
 564
 565         /*
 566          * handle unaligned start bytes
 567          */
 568         if ((l = addr - wp) != 0) {
 569                 data = 0;
 570                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 571                         data = (data << 8) | (*(uchar *) cp);
 572                 }
 573                 for (; i < 4 && cnt > 0; ++i) {
 574                         data = (data << 8) | *src++;
 575                         --cnt;
 576                         ++cp;
 577                 }
 578                 for (; cnt == 0 && i < 4; ++i, ++cp) {
 579                         data = (data << 8) | (*(uchar *) cp);
 580                 }
 581
 582                 if ((rc = write_word (info, wp, data)) != 0) {
 583                         return (rc);
 584                 }
 585                 wp += 4;
 586         }
 587
 588         /*
 589          * handle word aligned part
 590          */
 591         while (cnt >= 4) {
 592                 data = 0;
 593                 for (i = 0; i < 4; ++i) {
 594                         data = (data << 8) | *src++;
 595                 }
 596                 if ((rc = write_word (info, wp, data)) != 0) {
 597                         return (rc);
 598                 }
 599                 wp += 4;
 600                 cnt -= 4;
 601         }
 602
 603         if (cnt == 0) {
 604                 return (0);
 605         }
 606
 607         /*
 608          * handle unaligned tail bytes
 609          */
 610         data = 0;
 611         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 612                 data = (data << 8) | *src++;
 613                 --cnt;
 614         }
 615         for (; i < 4; ++i, ++cp) {
 616                 data = (data << 8) | (*(uchar *) cp);
 617         }
 618
 619         return (write_word (info, wp, data));
 620 }
 621
 622 /*-----------------------------------------------------------------------
 623  * Write a word to Flash, returns:
 624  * 0 - OK
 625  * 1 - write timeout
 626  * 2 - Flash not erased
 627  */
 628 static int write_word (flash_info_t * info, ulong dest, ulong data)
 629 {
 630         volatile FLASH_WORD_SIZE *addr2 =
 631                 (FLASH_WORD_SIZE *) (info->start[0]);
 632         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 633         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 634         ulong start;
 635         int i;
 636
 637         /* Check if Flash is (sufficiently) erased */
 638         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 639              (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 640                 return (2);
 641         }
 642
 643         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 644                 int flag;
 645
 646                 /* Disable interrupts which might cause a timeout here */
 647                 flag = disable_interrupts ();
 648
 649                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 650                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 651                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 652
 653                 dest2[i] = data2[i];
 654
 655                 /* re-enable interrupts if necessary */
 656                 if (flag)
 657                         enable_interrupts ();
 658
 659                 /* data polling for D7 */
 660                 start = get_timer (0);
 661                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 662                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 663
 664                         if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 665                                 return (1);
 666                         }
 667                 }
 668         }
 669
 670         return (0);
 671 }