git.sur5r.net Git - u-boot/blob - 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         default:                printf ("Unknown Vendor ");     break;
 121         }
 122
 123         switch (info->flash_id & FLASH_TYPEMASK) {
 124         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 125                                 break;
 126         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 127                                 break;
 128         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 129                                 break;
 130         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 131                                 break;
 132         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 133                                 break;
 134         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 135                                 break;
 136         case FLASH_AM320T:      printf ("AM29LV320T (32 M, top sector)\n");
 137                                 break;
 138         case FLASH_AM320B:      printf ("AM29LV320B (32 M, bottom sector)\n");
 139                                 break;
 140         case FLASH_AMDL322T:    printf ("AM29DL322T (32 M, top sector)\n");
 141                                 break;
 142         case FLASH_AMDL322B:    printf ("AM29DL322B (32 M, bottom sector)\n");
 143                                 break;
 144         case FLASH_AMDL323T:    printf ("AM29DL323T (32 M, top sector)\n");
 145                                 break;
 146         case FLASH_AMDL323B:    printf ("AM29DL323B (32 M, bottom sector)\n");
 147                                 break;
 148         case FLASH_AM640U:      printf ("AM29LV640D (64 M, uniform sector)\n");
 149                                 break;
 150         case FLASH_SST800A:     printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 151                                 break;
 152         case FLASH_SST160A:     printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 153                                 break;
 154         default:                printf ("Unknown Chip Type\n");
 155                                 break;
 156         }
 157
 158         printf ("  Size: %ld MB in %d Sectors\n",
 159                 info->size >> 20, info->sector_count);
 160
 161         printf ("  Sector Start Addresses:");
 162         for (i=0; i<info->sector_count; ++i) {
 163 #ifdef CFG_FLASH_EMPTY_INFO
 164                 /*
 165                  * Check if whole sector is erased
 166                  */
 167                 if (i != (info->sector_count-1))
 168                   size = info->start[i+1] - info->start[i];
 169                 else
 170                   size = info->start[0] + info->size - info->start[i];
 171                 erased = 1;
 172                 flash = (volatile unsigned long *)info->start[i];
 173                 size = size >> 2;        /* divide by 4 for longword access */
 174                 for (k=0; k<size; k++)
 175                   {
 176                     if (*flash++ != 0xffffffff)
 177                       {
 178                         erased = 0;
 179                         break;
 180                       }
 181                   }
 182
 183                 if ((i % 5) == 0)
 184                         printf ("\n   ");
 185                 /* print empty and read-only info */
 186                 printf (" %08lX%s%s",
 187                         info->start[i],
 188                         erased ? " E" : "  ",
 189                         info->protect[i] ? "RO " : "   ");
 190 #else
 191                 if ((i % 5) == 0)
 192                         printf ("\n   ");
 193                 printf (" %08lX%s",
 194                         info->start[i],
 195                         info->protect[i] ? " (RO)" : "     ");
 196 #endif
 197
 198         }
 199         printf ("\n");
 200         return;
 201 }
 202
 203 /*-----------------------------------------------------------------------
 204  */
 205
 206
 207 /*-----------------------------------------------------------------------
 208  */
 209
 210 /*
 211  * The following code cannot be run from FLASH!
 212  */
 213 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 214 {
 215         short i;
 216         short n;
 217         CFG_FLASH_WORD_SIZE value;
 218         ulong base = (ulong)addr;
 219         volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)addr;
 220
 221         /* Write auto select command: read Manufacturer ID */
 222         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 223         addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 224         addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00900090;
 225
 226         value = addr2[CFG_FLASH_READ0];
 227
 228         switch (value) {
 229         case (CFG_FLASH_WORD_SIZE)AMD_MANUFACT:
 230                 info->flash_id = FLASH_MAN_AMD;
 231                 break;
 232         case (CFG_FLASH_WORD_SIZE)FUJ_MANUFACT:
 233                 info->flash_id = FLASH_MAN_FUJ;
 234                 break;
 235         case (CFG_FLASH_WORD_SIZE)SST_MANUFACT:
 236                 info->flash_id = FLASH_MAN_SST;
 237                 break;
 238         default:
 239                 info->flash_id = FLASH_UNKNOWN;
 240                 info->sector_count = 0;
 241                 info->size = 0;
 242                 return (0);                     /* no or unknown flash  */
 243         }
 244
 245         value = addr2[CFG_FLASH_READ1];         /* device ID            */
 246
 247         switch (value) {
 248         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400T:
 249                 info->flash_id += FLASH_AM400T;
 250                 info->sector_count = 11;
 251                 info->size = 0x00080000;
 252                 break;                          /* => 0.5 MB            */
 253
 254         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV400B:
 255                 info->flash_id += FLASH_AM400B;
 256                 info->sector_count = 11;
 257                 info->size = 0x00080000;
 258                 break;                          /* => 0.5 MB            */
 259
 260         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800T:
 261                 info->flash_id += FLASH_AM800T;
 262                 info->sector_count = 19;
 263                 info->size = 0x00100000;
 264                 break;                          /* => 1 MB              */
 265
 266         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV800B:
 267                 info->flash_id += FLASH_AM800B;
 268                 info->sector_count = 19;
 269                 info->size = 0x00100000;
 270                 break;                          /* => 1 MB              */
 271
 272         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160T:
 273                 info->flash_id += FLASH_AM160T;
 274                 info->sector_count = 35;
 275                 info->size = 0x00200000;
 276                 break;                          /* => 2 MB              */
 277
 278         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV160B:
 279                 info->flash_id += FLASH_AM160B;
 280                 info->sector_count = 35;
 281                 info->size = 0x00200000;
 282                 break;                          /* => 2 MB              */
 283
 284         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320T:
 285                 info->flash_id += FLASH_AM320T;
 286                 info->sector_count = 71;
 287                 info->size = 0x00400000;  break;        /* => 4 MB      */
 288
 289         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV320B:
 290                 info->flash_id += FLASH_AM320B;
 291                 info->sector_count = 71;
 292                 info->size = 0x00400000;  break;        /* => 4 MB      */
 293
 294         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322T:
 295                 info->flash_id += FLASH_AMDL322T;
 296                 info->sector_count = 71;
 297                 info->size = 0x00400000;  break;        /* => 4 MB      */
 298
 299         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL322B:
 300                 info->flash_id += FLASH_AMDL322B;
 301                 info->sector_count = 71;
 302                 info->size = 0x00400000;  break;        /* => 4 MB      */
 303
 304         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323T:
 305                 info->flash_id += FLASH_AMDL323T;
 306                 info->sector_count = 71;
 307                 info->size = 0x00400000;  break;        /* => 4 MB      */
 308
 309         case (CFG_FLASH_WORD_SIZE)AMD_ID_DL323B:
 310                 info->flash_id += FLASH_AMDL323B;
 311                 info->sector_count = 71;
 312                 info->size = 0x00400000;  break;        /* => 4 MB      */
 313
 314         case (CFG_FLASH_WORD_SIZE)AMD_ID_LV640U:
 315                 info->flash_id += FLASH_AM640U;
 316                 info->sector_count = 128;
 317                 info->size = 0x00800000;  break;        /* => 8 MB      */
 318
 319         case (CFG_FLASH_WORD_SIZE)SST_ID_xF800A:
 320                 info->flash_id += FLASH_SST800A;
 321                 info->sector_count = 16;
 322                 info->size = 0x00100000;
 323                 break;                          /* => 1 MB              */
 324
 325         case (CFG_FLASH_WORD_SIZE)SST_ID_xF160A:
 326                 info->flash_id += FLASH_SST160A;
 327                 info->sector_count = 32;
 328                 info->size = 0x00200000;
 329                 break;                          /* => 2 MB              */
 330
 331         default:
 332                 info->flash_id = FLASH_UNKNOWN;
 333                 return (0);                     /* => no or unknown flash */
 334
 335         }
 336
 337         /* set up sector start address table */
 338         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 339             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U)) {
 340             for (i = 0; i < info->sector_count; i++)
 341                 info->start[i] = base + (i * 0x00010000);
 342         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322B) ||
 343                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323B) ||
 344                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B) ||
 345                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324B)) {
 346                 /* set sector offsets for bottom boot block type        */
 347                 for (i=0; i<8; ++i) {           /*  8 x 8k boot sectors */
 348                         info->start[i] = base;
 349                         base += 8 << 10;
 350                 }
 351                 while (i < info->sector_count) {        /* 64k regular sectors  */
 352                         info->start[i] = base;
 353                         base += 64 << 10;
 354                         ++i;
 355                 }
 356         } else if (((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL322T) ||
 357                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL323T) ||
 358                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T) ||
 359                    ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMDL324T)) {
 360                 /* set sector offsets for top boot block type           */
 361                 base += info->size;
 362                 i = info->sector_count;
 363                 for (n=0; n<8; ++n) {           /*  8 x 8k boot sectors */
 364                         base -= 8 << 10;
 365                         --i;
 366                         info->start[i] = base;
 367                 }
 368                 while (i > 0) {                 /* 64k regular sectors  */
 369                         base -= 64 << 10;
 370                         --i;
 371                         info->start[i] = base;
 372                 }
 373         } else {
 374             if (info->flash_id & FLASH_BTYPE) {
 375                 /* set sector offsets for bottom boot block type        */
 376                 info->start[0] = base + 0x00000000;
 377                 info->start[1] = base + 0x00004000;
 378                 info->start[2] = base + 0x00006000;
 379                 info->start[3] = base + 0x00008000;
 380                 for (i = 4; i < info->sector_count; i++) {
 381                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 382                 }
 383             } else {
 384                 /* set sector offsets for top boot block type           */
 385                 i = info->sector_count - 1;
 386                 info->start[i--] = base + info->size - 0x00004000;
 387                 info->start[i--] = base + info->size - 0x00006000;
 388                 info->start[i--] = base + info->size - 0x00008000;
 389                 for (; i >= 0; i--) {
 390                         info->start[i] = base + i * 0x00010000;
 391                 }
 392             }
 393         }
 394
 395         /* check for protected sectors */
 396         for (i = 0; i < info->sector_count; i++) {
 397                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 398                 /* D0 = 1 if protected */
 399                 addr2 = (volatile CFG_FLASH_WORD_SIZE *)(info->start[i]);
 400                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 401                   info->protect[i] = 0;
 402                 else
 403                   info->protect[i] = addr2[CFG_FLASH_READ2] & 1;
 404         }
 405
 406         /*
 407          * Prevent writes to uninitialized FLASH.
 408          */
 409         if (info->flash_id != FLASH_UNKNOWN) {
 410                 addr2 = (CFG_FLASH_WORD_SIZE *)info->start[0];
 411                 *addr2 = (CFG_FLASH_WORD_SIZE)0x00F000F0;       /* reset bank */
 412         }
 413
 414         return (info->size);
 415 }
 416
 417
 418 /*-----------------------------------------------------------------------
 419  */
 420
 421 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 422 {
 423         volatile CFG_FLASH_WORD_SIZE *addr = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 424         volatile CFG_FLASH_WORD_SIZE *addr2;
 425         int flag, prot, sect, l_sect;
 426         ulong start, now, last;
 427         int i;
 428
 429         if ((s_first < 0) || (s_first > s_last)) {
 430                 if (info->flash_id == FLASH_UNKNOWN) {
 431                         printf ("- missing\n");
 432                 } else {
 433                         printf ("- no sectors to erase\n");
 434                 }
 435                 return 1;
 436         }
 437
 438         if (info->flash_id == FLASH_UNKNOWN) {
 439                 printf ("Can't erase unknown flash type - aborted\n");
 440                 return 1;
 441         }
 442
 443         prot = 0;
 444         for (sect=s_first; sect<=s_last; ++sect) {
 445                 if (info->protect[sect]) {
 446                         prot++;
 447                 }
 448         }
 449
 450         if (prot) {
 451                 printf ("- Warning: %d protected sectors will not be erased!\n",
 452                         prot);
 453         } else {
 454                 printf ("\n");
 455         }
 456
 457         l_sect = -1;
 458
 459         /* Disable interrupts which might cause a timeout here */
 460         flag = disable_interrupts();
 461
 462         /* Start erase on unprotected sectors */
 463         for (sect = s_first; sect<=s_last; sect++) {
 464                 if (info->protect[sect] == 0) { /* not protected */
 465                     addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[sect]);
 466                     if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 467                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 468                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 469                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 470                         addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 471                         addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 472                         addr2[0] = (CFG_FLASH_WORD_SIZE)0x00500050;  /* block erase */
 473                         for (i=0; i<50; i++)
 474                           udelay(1000);  /* wait 1 ms */
 475                     } else {
 476                         if (sect == s_first) {
 477                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 478                             addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 479                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00800080;
 480                             addr[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 481                             addr[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 482                         }
 483                         addr2[0] = (CFG_FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 484                     }
 485                     l_sect = sect;
 486                 }
 487         }
 488
 489         /* re-enable interrupts if necessary */
 490         if (flag)
 491                 enable_interrupts();
 492
 493         /* wait at least 80us - let's wait 1 ms */
 494         udelay (1000);
 495
 496         /*
 497          * We wait for the last triggered sector
 498          */
 499         if (l_sect < 0)
 500                 goto DONE;
 501
 502         start = get_timer (0);
 503         last  = start;
 504         addr = (CFG_FLASH_WORD_SIZE *)(info->start[l_sect]);
 505         while ((addr[0] & (CFG_FLASH_WORD_SIZE)0x00800080) != (CFG_FLASH_WORD_SIZE)0x00800080) {
 506                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 507                         printf ("Timeout\n");
 508                         return 1;
 509                 }
 510                 /* show that we're waiting */
 511                 if ((now - last) > 1000) {      /* every second */
 512                         putc ('.');
 513                         last = now;
 514                 }
 515         }
 516
 517 DONE:
 518         /* reset to read mode */
 519         addr = (CFG_FLASH_WORD_SIZE *)info->start[0];
 520         addr[0] = (CFG_FLASH_WORD_SIZE)0x00F000F0;      /* reset bank */
 521
 522         printf (" done\n");
 523         return 0;
 524 }
 525
 526 /*-----------------------------------------------------------------------
 527  * Copy memory to flash, returns:
 528  * 0 - OK
 529  * 1 - write timeout
 530  * 2 - Flash not erased
 531  */
 532
 533 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 534 {
 535         ulong cp, wp, data;
 536         int i, l, rc;
 537
 538         wp = (addr & ~3);       /* get lower word aligned address */
 539
 540         /*
 541          * handle unaligned start bytes
 542          */
 543         if ((l = addr - wp) != 0) {
 544                 data = 0;
 545                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 546                         data = (data << 8) | (*(uchar *)cp);
 547                 }
 548                 for (; i<4 && cnt>0; ++i) {
 549                         data = (data << 8) | *src++;
 550                         --cnt;
 551                         ++cp;
 552                 }
 553                 for (; cnt==0 && i<4; ++i, ++cp) {
 554                         data = (data << 8) | (*(uchar *)cp);
 555                 }
 556
 557                 if ((rc = write_word(info, wp, data)) != 0) {
 558                         return (rc);
 559                 }
 560                 wp += 4;
 561         }
 562
 563         /*
 564          * handle word aligned part
 565          */
 566         while (cnt >= 4) {
 567                 data = 0;
 568                 for (i=0; i<4; ++i) {
 569                         data = (data << 8) | *src++;
 570                 }
 571                 if ((rc = write_word(info, wp, data)) != 0) {
 572                         return (rc);
 573                 }
 574                 wp  += 4;
 575                 cnt -= 4;
 576         }
 577
 578         if (cnt == 0) {
 579                 return (0);
 580         }
 581
 582         /*
 583          * handle unaligned tail bytes
 584          */
 585         data = 0;
 586         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 587                 data = (data << 8) | *src++;
 588                 --cnt;
 589         }
 590         for (; i<4; ++i, ++cp) {
 591                 data = (data << 8) | (*(uchar *)cp);
 592         }
 593
 594         return (write_word(info, wp, data));
 595 }
 596
 597 /*-----------------------------------------------------------------------
 598  * Write a word to Flash, returns:
 599  * 0 - OK
 600  * 1 - write timeout
 601  * 2 - Flash not erased
 602  */
 603 static int write_word (flash_info_t *info, ulong dest, ulong data)
 604 {
 605         volatile CFG_FLASH_WORD_SIZE *addr2 = (CFG_FLASH_WORD_SIZE *)(info->start[0]);
 606         volatile CFG_FLASH_WORD_SIZE *dest2 = (CFG_FLASH_WORD_SIZE *)dest;
 607         volatile CFG_FLASH_WORD_SIZE *data2 = (CFG_FLASH_WORD_SIZE *)&data;
 608         ulong start;
 609         int flag;
 610         int i;
 611
 612         /* Check if Flash is (sufficiently) erased */
 613         if ((*((volatile CFG_FLASH_WORD_SIZE *)dest) &
 614              (CFG_FLASH_WORD_SIZE)data) != (CFG_FLASH_WORD_SIZE)data) {
 615                 return (2);
 616         }
 617         /* Disable interrupts which might cause a timeout here */
 618         flag = disable_interrupts();
 619
 620         for (i=0; i<4/sizeof(CFG_FLASH_WORD_SIZE); i++)
 621           {
 622             addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00AA00AA;
 623             addr2[CFG_FLASH_ADDR1] = (CFG_FLASH_WORD_SIZE)0x00550055;
 624             addr2[CFG_FLASH_ADDR0] = (CFG_FLASH_WORD_SIZE)0x00A000A0;
 625
 626             dest2[i] = data2[i];
 627
 628             /* re-enable interrupts if necessary */
 629             if (flag)
 630               enable_interrupts();
 631
 632             /* data polling for D7 */
 633             start = get_timer (0);
 634             while ((dest2[i] & (CFG_FLASH_WORD_SIZE)0x00800080) !=
 635                    (data2[i] & (CFG_FLASH_WORD_SIZE)0x00800080)) {
 636               if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 637                 return (1);
 638               }
 639             }
 640           }
 641
 642         return (0);
 643 }
 644
 645 /*-----------------------------------------------------------------------
 646  */