board/pcs440ep/flash.c

   1 /*
   2  * (C) Copyright 2006
   3  * Stefan Roese, DENX Software Engineering, sr@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 #include <common.h>
  25 #include <asm/processor.h>
  26
  27 #ifndef CFG_FLASH_READ0
  28 #define CFG_FLASH_READ0         0x0000  /* 0 is standard                        */
  29 #define CFG_FLASH_READ1         0x0001  /* 1 is standard                        */
  30 #define CFG_FLASH_READ2         0x0002  /* 2 is standard                        */
  31 #endif
  32
  33 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  34
  35 /*
  36  * Functions
  37  */
  38 static int write_word(flash_info_t *info, ulong dest, ulong data);
  39 static ulong flash_get_size(vu_long *addr, flash_info_t *info);
  40
  41 unsigned long flash_init(void)
  42 {
  43         unsigned long size_b0, size_b1;
  44         int i;
  45         unsigned long base_b0, base_b1;
  46
  47         /* Init: no FLASHes known */
  48         for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
  49                 flash_info[i].flash_id = FLASH_UNKNOWN;
  50         }
  51
  52         /* Static FLASH Bank configuration here - FIXME XXX */
  53
  54         base_b0 = FLASH_BASE0_PRELIM;
  55         size_b0 = flash_get_size ((vu_long *) base_b0, &flash_info[0]);
  56
  57         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  58                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  59                                 size_b0, size_b0 << 20);
  60         }
  61
  62         base_b1 = FLASH_BASE1_PRELIM;
  63         size_b1 = flash_get_size ((vu_long *) base_b1, &flash_info[1]);
  64
  65         return (size_b0 + size_b1);
  66 }
  67
  68 void flash_print_info(flash_info_t *info)
  69 {
  70         int i;
  71         int k;
  72         int size;
  73         int erased;
  74         volatile unsigned long *flash;
  75
  76         if (info->flash_id == FLASH_UNKNOWN) {
  77                 printf ("missing or unknown FLASH type\n");
  78                 return;
  79         }
  80
  81         switch (info->flash_id & FLASH_VENDMASK) {
  82         case FLASH_MAN_AMD:     printf ("AMD ");                break;
  83         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
  84         case FLASH_MAN_SST:     printf ("SST ");                break;
  85         case FLASH_MAN_STM:     printf ("ST Micro");            break;
  86         case FLASH_MAN_EXCEL:   printf ("Excel Semiconductor "); break;
  87         case FLASH_MAN_MX:      printf ("MXIC "); break;
  88         default:                printf ("Unknown Vendor ");     break;
  89         }
  90
  91         switch (info->flash_id & FLASH_TYPEMASK) {
  92         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
  93                 break;
  94         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
  95                 break;
  96         case FLASH_AM040:       printf ("AM29LV040B (4 Mbit, uniform sector size)\n");
  97                 break;
  98         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
  99                 break;
 100         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 101                 break;
 102         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 103                 break;
 104         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 105                 break;
 106         case FLASH_AM320T:      printf ("AM29LV320T (32 M, top sector)\n");
 107                 break;
 108         case FLASH_AM320B:      printf ("AM29LV320B (32 M, bottom sector)\n");
 109                 break;
 110         case FLASH_AMDL322T:    printf ("AM29DL322T (32 M, top sector)\n");
 111                 break;
 112         case FLASH_AMDL322B:    printf ("AM29DL322B (32 M, bottom sector)\n");
 113                 break;
 114         case FLASH_AMDL323T:    printf ("AM29DL323T (32 M, top sector)\n");
 115                 break;
 116         case FLASH_AMDL323B:    printf ("AM29DL323B (32 M, bottom sector)\n");
 117                 break;
 118         case FLASH_SST020:      printf ("SST39LF/VF020 (2 Mbit, uniform sector size)\n");
 119                 break;
 120         case FLASH_SST040:      printf ("SST39LF/VF040 (4 Mbit, uniform sector size)\n");
 121                 break;
 122         case STM_ID_M29W040B:   printf ("ST Micro M29W040B (4 Mbit, uniform sector size)\n");
 123                 break;
 124         default:                printf ("Unknown Chip Type\n");
 125                 break;
 126         }
 127
 128         printf ("  Size: %ld MB in %d Sectors\n",
 129                 info->size >> 20, info->sector_count);
 130
 131         printf ("  Sector Start Addresses:");
 132         for (i=0; i<info->sector_count; ++i) {
 133 #ifdef CFG_FLASH_EMPTY_INFO
 134                 /*
 135                  * Check if whole sector is erased
 136                  */
 137                 if (i != (info->sector_count-1))
 138                         size = info->start[i+1] - info->start[i];
 139                 else
 140                         size = info->start[0] + info->size - info->start[i];
 141                 erased = 1;
 142                 flash = (volatile unsigned long *)info->start[i];
 143                 size = size >> 2;       /* divide by 4 for longword access */
 144                 for (k=0; k<size; k++) {
 145                         if (*flash++ != 0xffffffff) {
 146                                 erased = 0;
 147                                 break;
 148                         }
 149                 }
 150
 151                 if ((i % 5) == 0)
 152                         printf ("\n   ");
 153                 /* print empty and read-only info */
 154                 printf (" %08lX%s%s",
 155                         info->start[i],
 156                         erased ? " E" : "  ",
 157                         info->protect[i] ? "RO " : "   ");
 158 #else
 159                 if ((i % 5) == 0)
 160                         printf ("\n   ");
 161                 printf (" %08lX%s",
 162                         info->start[i],
 163                         info->protect[i] ? " (RO)" : "     ");
 164 #endif
 165
 166         }
 167         printf ("\n");
 168         return;
 169 }
 170
 171 /*
 172  * The following code cannot be run from FLASH!
 173  */
 174 static ulong flash_get_size(vu_long *addr, flash_info_t *info)
 175 {
 176         short i;
 177         short n;
 178         volatile CFG_FLASH_WORD_SIZE value;
 179         ulong base = (ulong)addr;
 180         volatile CFG_FLASH_WORD_SIZE *addr2 = (volatile CFG_FLASH_WORD_SIZE *)addr;
 181
 182         /* Write auto select command: read Manufacturer ID */
 183         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 184         addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 185         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;
 186
 187         value = addr2[CFG_FLASH_READ0];
 188
 189         switch (value) {
 190         case (CFG_FLASH_WORD_SIZE)AMD_MANUFACT:
 191                 info->flash_id = FLASH_MAN_AMD;
 192                 break;
 193         case (CFG_FLASH_WORD_SIZE)FUJ_MANUFACT:
 194                 info->flash_id = FLASH_MAN_FUJ;
 195                 break;
 196         case (CFG_FLASH_WORD_SIZE)SST_MANUFACT:
 197                 info->flash_id = FLASH_MAN_SST;
 198                 break;
 199         case (CFG_FLASH_WORD_SIZE)STM_MANUFACT:
 200                 info->flash_id = FLASH_MAN_STM;
 201                 break;
 202         case (CFG_FLASH_WORD_SIZE)EXCEL_MANUFACT:
 203                 info->flash_id = FLASH_MAN_EXCEL;
 204                 break;
 205         case (CFG_FLASH_WORD_SIZE)MX_MANUFACT:
 206                 info->flash_id = FLASH_MAN_MX;
 207                 break;
 208         default:
 209                 info->flash_id = FLASH_UNKNOWN;
 210                 info->sector_count = 0;
 211                 info->size = 0;
 212                 return (0);                     /* no or unknown flash  */
 213         }
 214
 215         value = addr2[CFG_FLASH_READ1];         /* device ID    */
 216
 217         switch (value) {
 218         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400T:
 219                 info->flash_id += FLASH_AM400T;
 220                 info->sector_count = 11;
 221                 info->size = 0x00080000;
 222                 break;                          /* => 0.5 MB    */
 223
 224         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400B:
 225                 info->flash_id += FLASH_AM400B;
 226                 info->sector_count = 11;
 227                 info->size = 0x00080000;
 228                 break;                          /* => 0.5 MB    */
 229
 230         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV040B:
 231                 info->flash_id += FLASH_AM040;
 232                 info->sector_count = 8;
 233                 info->size = 0x0080000;         /* => 0.5 MB    */
 234                 break;
 235         case (CFG_FLASH_WORD_SIZE)STM_ID_M29W040B:
 236                 info->flash_id += FLASH_AM040;
 237                 info->sector_count = 8;
 238                 info->size = 0x0080000; /* => 0,5 MB */
 239                 break;
 240
 241         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800T:
 242                 info->flash_id += FLASH_AM800T;
 243                 info->sector_count = 19;
 244                 info->size = 0x00100000;
 245                 break;                          /* => 1 MB      */
 246
 247         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800B:
 248                 info->flash_id += FLASH_AM800B;
 249                 info->sector_count = 19;
 250                 info->size = 0x00100000;
 251                 break;                          /* => 1 MB      */
 252
 253         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160T:
 254                 info->flash_id += FLASH_AM160T;
 255                 info->sector_count = 35;
 256                 info->size = 0x00200000;
 257                 break;                          /* => 2 MB      */
 258
 259         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160B:
 260                 info->flash_id += FLASH_AM160B;
 261                 info->sector_count = 35;
 262                 info->size = 0x00200000;
 263                 break;                          /* => 2 MB      */
 264
 265         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320T:
 266                 info->flash_id += FLASH_AM320T;
 267                 info->sector_count = 71;
 268                 info->size = 0x00400000;
 269                 break;                          /* => 4 MB      */
 270
 271         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320B:
 272                 info->flash_id += FLASH_AM320B;
 273                 info->sector_count = 71;
 274                 info->size = 0x00400000;
 275                 break;                          /* => 4 MB      */
 276
 277         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322T:
 278                 info->flash_id += FLASH_AMDL322T;
 279                 info->sector_count = 71;
 280                 info->size = 0x00400000;
 281                 break;                          /* => 4 MB      */
 282
 283         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322B:
 284                 info->flash_id += FLASH_AMDL322B;
 285                 info->sector_count = 71;
 286                 info->size = 0x00400000;
 287                 break;                          /* => 4 MB      */
 288
 289         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323T:
 290                 info->flash_id += FLASH_AMDL323T;
 291                 info->sector_count = 71;
 292                 info->size = 0x00400000;
 293                 break;                          /* => 4 MB      */
 294
 295         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323B:
 296                 info->flash_id += FLASH_AMDL323B;
 297                 info->sector_count = 71;
 298                 info->size = 0x00400000;
 299                 break;                          /* => 4 MB      */
 300
 301         case (CFG_FLASH_WORD_SIZE)SST_ID_xF020:
 302                 info->flash_id += FLASH_SST020;
 303                 info->sector_count = 64;
 304                 info->size = 0x00040000;
 305                 break;                          /* => 256 kB    */
 306
 307         case (CFG_FLASH_WORD_SIZE)SST_ID_xF040:
 308                 info->flash_id += FLASH_SST040;
 309                 info->sector_count = 128;
 310                 info->size = 0x00080000;
 311                 break;                          /* => 512 kB    */
 312
 313         default:
 314                 info->flash_id = FLASH_UNKNOWN;
 315                 return (0);                     /* => no or unknown flash */
 316
 317         }
 318
 319         /* set up sector start address table */
 320         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 321             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U)) {
 322                 for (i = 0; i < info->sector_count; i++)
 323                         info->start[i] = base + (i * 0x00001000);
 324         } else if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
 325                 for (i = 0; i < info->sector_count; i++)
 326                         info->start[i] = base + (i * 0x00010000);
 327         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322B) ||
 328                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323B) ||
 329                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
 330                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324B)) {
 331                 /* set sector offsets for bottom boot block type        */
 332                 for (i=0; i<8; ++i) {           /*  8 x 8k boot sectors */
 333                         info->start[i] = base;
 334                         base += 8 << 10;
 335                 }
 336                 while (i < info->sector_count) {        /* 64k regular sectors  */
 337                         info->start[i] = base;
 338                         base += 64 << 10;
 339                         ++i;
 340                 }
 341         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322T) ||
 342                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323T) ||
 343                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
 344                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324T)) {
 345                 /* set sector offsets for top boot block type           */
 346                 base += info->size;
 347                 i = info->sector_count;
 348                 for (n=0; n<8; ++n) {           /*  8 x 8k boot sectors */
 349                         base -= 8 << 10;
 350                         --i;
 351                         info->start[i] = base;
 352                 }
 353                 while (i > 0) {                 /* 64k regular sectors  */
 354                         base -= 64 << 10;
 355                         --i;
 356                         info->start[i] = base;
 357                 }
 358         } else {
 359                 if (info->flash_id & FLASH_BTYPE) {
 360                         /* set sector offsets for bottom boot block type        */
 361                         info->start[0] = base + 0x00000000;
 362                         info->start[1] = base + 0x00004000;
 363                         info->start[2] = base + 0x00006000;
 364                         info->start[3] = base + 0x00008000;
 365                         for (i = 4; i < info->sector_count; i++) {
 366                                 info->start[i] = base + (i * 0x00010000) - 0x00030000;
 367                         }
 368                 } else {
 369                         /* set sector offsets for top boot block type           */
 370                         i = info->sector_count - 1;
 371                         info->start[i--] = base + info->size - 0x00004000;
 372                         info->start[i--] = base + info->size - 0x00006000;
 373                         info->start[i--] = base + info->size - 0x00008000;
 374                         for (; i >= 0; i--) {
 375                                 info->start[i] = base + i * 0x00010000;
 376                         }
 377                 }
 378         }
 379
 380         /* check for protected sectors */
 381         for (i = 0; i < info->sector_count; i++) {
 382                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 383                 /* D0 = 1 if protected */
 384                 addr2 = (volatile CFG_FLASH_WORD_SIZE *)(info->start[i]);
 385                 if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_AMD)
 386                         info->protect[i] = 0;
 387                 else
 388                         info->protect[i] = addr2[CFG_FLASH_READ2] & 1;
 389         }
 390
 391         /*
 392          * Prevent writes to uninitialized FLASH.
 393          */
 394         if (info->flash_id != FLASH_UNKNOWN) {
 395                 addr2 = (CFG_FLASH_WORD_SIZE *)info->start[0];
 396                 *addr2 = (CFG_FLASH_WORD_SIZE)0x00F000F0;       /* reset bank */
 397         }
 398
 399         return (info->size);
 400 }
 401
 402
 403 int flash_erase(flash_info_t *info, int s_first, int s_last)
 404 {
 405         volatile CFG_FLASH_WORD_SIZE *addr = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 406         volatile CFG_FLASH_WORD_SIZE *addr2;
 407         int flag, prot, sect, l_sect;
 408         ulong start, now, last;
 409
 410         if ((s_first < 0) || (s_first > s_last)) {
 411                 if (info->flash_id == FLASH_UNKNOWN)
 412                         printf ("- missing\n");
 413                 else
 414                         printf ("- no sectors to erase\n");
 415                 return 1;
 416         }
 417
 418         if (info->flash_id == FLASH_UNKNOWN) {
 419                 printf ("Can't erase unknown flash type - aborted\n");
 420                 return 1;
 421         }
 422
 423         prot = 0;
 424         for (sect=s_first; sect<=s_last; ++sect)
 425                 if (info->protect[sect])
 426                         prot++;
 427
 428         if (prot)
 429                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 430         else
 431                 printf ("\n");
 432
 433         l_sect = -1;
 434
 435         /* Disable interrupts which might cause a timeout here */
 436         flag = disable_interrupts();
 437
 438         /* Start erase on unprotected sectors */
 439         for (sect = s_first; sect<=s_last; sect++) {
 440                 if (info->protect[sect] == 0) { /* not protected */
 441                         addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[sect]);
 442                         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 443                                 addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 444                                 addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 445                                 addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 446                                 addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 447                                 addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 448                                 addr2[0] = (CFG_FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 449
 450                                 /* re-enable interrupts if necessary */
 451                                 if (flag) {
 452                                         enable_interrupts();
 453                                         flag = 0;
 454                                 }
 455
 456                                 /* data polling for D7 */
 457                                 start = get_timer (0);
 458                                 while ((addr2[0] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
 459                                        (CFG_FLASH_WORD_SIZE)0x00800080) {
 460                                         if (get_timer(start) > CFG_FLASH_WRITE_TOUT)
 461                                                 return (1);
 462                                 }
 463                         } else {
 464                                 if (sect == s_first) {
 465                                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 466                                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 467                                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 468                                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 469                                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 470                                 }
 471                                 addr2[0] = (CFG_FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 472                         }
 473                         l_sect = sect;
 474                 }
 475         }
 476
 477         /* re-enable interrupts if necessary */
 478         if (flag)
 479                 enable_interrupts();
 480
 481         /* wait at least 80us - let's wait 1 ms */
 482         udelay (1000);
 483
 484         /*
 485          * We wait for the last triggered sector
 486          */
 487         if (l_sect < 0)
 488                 goto DONE;
 489
 490         start = get_timer (0);
 491         last  = start;
 492         addr = (CFG_FLASH_WORD_SIZE *)(info->start[l_sect]);
 493         while ((addr[0] & (CFG_FLASH_WORD_SIZE)0x00800080) != (CFG_FLASH_WORD_SIZE)0x00800080) {
 494                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 495                         printf ("Timeout\n");
 496                         return 1;
 497                 }
 498                 /* show that we're waiting */
 499                 if ((now - last) > 1000) {      /* every second */
 500                         putc ('.');
 501                         last = now;
 502                 }
 503         }
 504
 505 DONE:
 506         /* reset to read mode */
 507         addr = (CFG_FLASH_WORD_SIZE *)info->start[0];
 508         addr[0] = (CFG_FLASH_WORD_SIZE)0x00F000F0;      /* reset bank */
 509
 510         printf (" done\n");
 511         return 0;
 512 }
 513
 514 /*
 515  * Copy memory to flash, returns:
 516  * 0 - OK
 517  * 1 - write timeout
 518  * 2 - Flash not erased
 519  */
 520 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 521 {
 522         ulong cp, wp, data;
 523         int i, l, rc;
 524
 525         wp = (addr & ~3);       /* get lower word aligned address */
 526
 527         /*
 528          * handle unaligned start bytes
 529          */
 530         if ((l = addr - wp) != 0) {
 531                 data = 0;
 532                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 533                         data = (data << 8) | (*(uchar *)cp);
 534                 }
 535                 for (; i<4 && cnt>0; ++i) {
 536                         data = (data << 8) | *src++;
 537                         --cnt;
 538                         ++cp;
 539                 }
 540                 for (; cnt==0 && i<4; ++i, ++cp) {
 541                         data = (data << 8) | (*(uchar *)cp);
 542                 }
 543
 544                 if ((rc = write_word(info, wp, data)) != 0) {
 545                         return (rc);
 546                 }
 547                 wp += 4;
 548         }
 549
 550         /*
 551          * handle word aligned part
 552          */
 553         while (cnt >= 4) {
 554                 data = 0;
 555                 for (i=0; i<4; ++i)
 556                         data = (data << 8) | *src++;
 557                 if ((rc = write_word(info, wp, data)) != 0)
 558                         return (rc);
 559                 wp  += 4;
 560                 cnt -= 4;
 561         }
 562
 563         if (cnt == 0)
 564                 return (0);
 565
 566         /*
 567          * handle unaligned tail bytes
 568          */
 569         data = 0;
 570         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 571                 data = (data << 8) | *src++;
 572                 --cnt;
 573         }
 574         for (; i<4; ++i, ++cp)
 575                 data = (data << 8) | (*(uchar *)cp);
 576
 577         return (write_word(info, wp, data));
 578 }
 579
 580 /*
 581  * Write a word to Flash, returns:
 582  * 0 - OK
 583  * 1 - write timeout
 584  * 2 - Flash not erased
 585  */
 586 static int write_word(flash_info_t *info, ulong dest, ulong data)
 587 {
 588         volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 589         volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
 590         volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)&data;
 591         ulong start;
 592         int flag;
 593         int i;
 594
 595         /* Check if Flash is (sufficiently) erased */
 596         if ((*((vu_long *)dest) & data) != data)
 597                 return (2);
 598
 599         /* Disable interrupts which might cause a timeout here */
 600         flag = disable_interrupts();
 601
 602         for (i=0; i<4/sizeof(CFG_FLASH_WORD_SIZE); i++) {
 603                 addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 604                 addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 605                 addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00A000A0;
 606
 607                 dest2[i] = data2[i];
 608
 609                 /* re-enable interrupts if necessary */
 610                 if (flag)
 611                         enable_interrupts();
 612
 613                 /* data polling for D7 */
 614                 start = get_timer (0);
 615                 while ((dest2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
 616                        (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080)) {
 617                         if (get_timer(start) > CFG_FLASH_WRITE_TOUT)
 618                                 return (1);
 619                 }
 620         }
 621
 622         return (0);
 623 }