board/tqm8xx/flash.c

   1 /*
   2  * (C) Copyright 2000-2002
   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 /* #define DEBUG */
  25
  26 #include <common.h>
  27 #include <mpc8xx.h>
  28 #include <environment.h>
  29
  30 #ifndef CFG_ENV_ADDR
  31 #define CFG_ENV_ADDR    (CFG_FLASH_BASE + CFG_ENV_OFFSET)
  32 #endif
  33
  34 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  35
  36 /*-----------------------------------------------------------------------
  37  * Functions
  38  */
  39 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  40 static int write_word (flash_info_t *info, ulong dest, ulong data);
  41
  42 /*-----------------------------------------------------------------------
  43  */
  44
  45 unsigned long flash_init (void)
  46 {
  47         volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  48         volatile memctl8xx_t *memctl = &immap->im_memctl;
  49         unsigned long size_b0, size_b1;
  50         int i;
  51
  52         /* Init: no FLASHes known */
  53         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  54                 flash_info[i].flash_id = FLASH_UNKNOWN;
  55         }
  56
  57         /* Static FLASH Bank configuration here - FIXME XXX */
  58
  59         debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);
  60
  61         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  62
  63         debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);
  64
  65         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  66                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  67                         size_b0, size_b0<<20);
  68         }
  69
  70         size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
  71
  72         debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
  73
  74         if (size_b1 > size_b0) {
  75                 printf ("## ERROR: "
  76                         "Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
  77                         size_b1, size_b1<<20,
  78                         size_b0, size_b0<<20
  79                 );
  80                 flash_info[0].flash_id  = FLASH_UNKNOWN;
  81                 flash_info[1].flash_id  = FLASH_UNKNOWN;
  82                 flash_info[0].sector_count      = -1;
  83                 flash_info[1].sector_count      = -1;
  84                 flash_info[0].size              = 0;
  85                 flash_info[1].size              = 0;
  86                 return (0);
  87         }
  88
  89         debug  ("## Before remap: "
  90                 "BR0: 0x%08x    OR0: 0x%08x    "
  91                 "BR1: 0x%08x    OR1: 0x%08x\n",
  92                 memctl->memc_br0, memctl->memc_or0,
  93                 memctl->memc_br1, memctl->memc_or1);
  94
  95         /* Remap FLASH according to real size */
  96         memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK);
  97         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
  98
  99         debug ("## BR0: 0x%08x    OR0: 0x%08x\n",
 100                 memctl->memc_br0, memctl->memc_or0);
 101
 102         /* Re-do sizing to get full correct info */
 103         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
 104
 105 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 106         /* monitor protection ON by default */
 107         debug ("Protect monitor: %08lx ... %08lx\n",
 108                 (ulong)CFG_MONITOR_BASE,
 109                 (ulong)CFG_MONITOR_BASE + monitor_flash_len - 1);
 110
 111         flash_protect(FLAG_PROTECT_SET,
 112                       CFG_MONITOR_BASE,
 113                       CFG_MONITOR_BASE + monitor_flash_len - 1,
 114                       &flash_info[0]);
 115 #endif
 116
 117 #ifdef  CFG_ENV_IS_IN_FLASH
 118         /* ENV protection ON by default */
 119         debug ("Protect %senvironment: %08lx ... %08lx\n",
 120 # ifdef CFG_ENV_ADDR_REDUND
 121                 "primary   ",
 122 # else
 123                 "",
 124 # endif
 125                 (ulong)CFG_ENV_ADDR,
 126                 (ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);
 127
 128         flash_protect(FLAG_PROTECT_SET,
 129                       CFG_ENV_ADDR,
 130                       CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
 131                       &flash_info[0]);
 132 #endif
 133
 134 #ifdef CFG_ENV_ADDR_REDUND
 135         debug ("Protect redundand environment: %08lx ... %08lx\n",
 136                 (ulong)CFG_ENV_ADDR_REDUND,
 137                 (ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);
 138
 139         flash_protect(FLAG_PROTECT_SET,
 140                       CFG_ENV_ADDR_REDUND,
 141                       CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
 142                       &flash_info[0]);
 143 #endif
 144
 145         if (size_b1) {
 146                 memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 147                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 148                                     BR_MS_GPCM | BR_V;
 149
 150                 debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
 151                         memctl->memc_br1, memctl->memc_or1);
 152
 153                 /* Re-do sizing to get full correct info */
 154                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 155                                           &flash_info[1]);
 156
 157 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 158                 /* monitor protection ON by default */
 159                 flash_protect(FLAG_PROTECT_SET,
 160                               CFG_MONITOR_BASE,
 161                               CFG_MONITOR_BASE+monitor_flash_len-1,
 162                               &flash_info[1]);
 163 #endif
 164
 165 #ifdef  CFG_ENV_IS_IN_FLASH
 166                 /* ENV protection ON by default */
 167                 flash_protect(FLAG_PROTECT_SET,
 168                               CFG_ENV_ADDR,
 169                               CFG_ENV_ADDR+CFG_ENV_SIZE-1,
 170                               &flash_info[1]);
 171 #endif
 172         } else {
 173                 memctl->memc_br1 = 0;           /* invalidate bank */
 174
 175                 flash_info[1].flash_id = FLASH_UNKNOWN;
 176                 flash_info[1].sector_count = -1;
 177                 flash_info[1].size = 0;
 178
 179                 debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
 180                         memctl->memc_br1, memctl->memc_or1);
 181         }
 182
 183         debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
 184
 185         flash_info[0].size = size_b0;
 186         flash_info[1].size = size_b1;
 187
 188         return (size_b0 + size_b1);
 189 }
 190
 191 /*-----------------------------------------------------------------------
 192  */
 193 void flash_print_info  (flash_info_t *info)
 194 {
 195         int i;
 196
 197         if (info->flash_id == FLASH_UNKNOWN) {
 198                 printf ("missing or unknown FLASH type\n");
 199                 return;
 200         }
 201
 202         switch (info->flash_id & FLASH_VENDMASK) {
 203         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 204         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 205         default:                printf ("Unknown Vendor ");     break;
 206         }
 207
 208         switch (info->flash_id & FLASH_TYPEMASK) {
 209 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 210         case FLASH_AMLV128U:    printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
 211                                 break;
 212         case FLASH_AMLV320U:    printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
 213                                 break;
 214         case FLASH_AMLV640U:    printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
 215                                 break;
 216 # else  /* ! TQM8xxM */
 217         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 218                                 break;
 219         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 220                                 break;
 221         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 222                                 break;
 223         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 224                                 break;
 225         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 226                                 break;
 227         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 228                                 break;
 229 #endif  /* TQM8xxM */
 230         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 231                                 break;
 232         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 233                                 break;
 234         default:                printf ("Unknown Chip Type\n");
 235                                 break;
 236         }
 237
 238         printf ("  Size: %ld MB in %d Sectors\n",
 239                 info->size >> 20, info->sector_count);
 240
 241         printf ("  Sector Start Addresses:");
 242         for (i=0; i<info->sector_count; ++i) {
 243                 if ((i % 5) == 0)
 244                         printf ("\n   ");
 245                 printf (" %08lX%s",
 246                         info->start[i],
 247                         info->protect[i] ? " (RO)" : "     "
 248                 );
 249         }
 250         printf ("\n");
 251         return;
 252 }
 253
 254 /*-----------------------------------------------------------------------
 255  */
 256
 257
 258 /*-----------------------------------------------------------------------
 259  */
 260
 261 /*
 262  * The following code cannot be run from FLASH!
 263  */
 264
 265 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 266 {
 267         short i;
 268         ulong value;
 269         ulong base = (ulong)addr;
 270
 271         /* Write auto select command: read Manufacturer ID */
 272         addr[0x0555] = 0x00AA00AA;
 273         addr[0x02AA] = 0x00550055;
 274         addr[0x0555] = 0x00900090;
 275
 276         value = addr[0];
 277
 278         debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
 279
 280         switch (value) {
 281         case AMD_MANUFACT:
 282                 info->flash_id = FLASH_MAN_AMD;
 283                 break;
 284         case FUJ_MANUFACT:
 285                 info->flash_id = FLASH_MAN_FUJ;
 286                 break;
 287         default:
 288                 info->flash_id = FLASH_UNKNOWN;
 289                 info->sector_count = 0;
 290                 info->size = 0;
 291                 return (0);                     /* no or unknown flash  */
 292         }
 293
 294         value = addr[1];                        /* device ID            */
 295
 296         debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
 297
 298         switch (value) {
 299 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 300         case AMD_ID_MIRROR:
 301                 /* Special case for AMLV320MH/L */
 302                 if ((addr[14] & 0x00ff00ff) == 0x001d001d &&
 303                         (addr[15] & 0x00ff00ff) == 0x00000000) {
 304                         info->flash_id += FLASH_AMLV320U;
 305                         info->sector_count = 64;
 306                         info->size = 0x00800000; /* => 8 MB */
 307                         break;
 308                 }
 309                 switch(addr[14]) {
 310                 case AMD_ID_LV128U_2:
 311                         if (addr[15] != AMD_ID_LV128U_3) {
 312                                 info->flash_id = FLASH_UNKNOWN;
 313                         }
 314                         else {
 315                                 info->flash_id += FLASH_AMLV128U;
 316                                 info->sector_count = 256;
 317                                 info->size = 0x02000000;
 318                         }
 319                         break;                          /* => 32 MB             */
 320                 case AMD_ID_LV640U_2:
 321                         if (addr[15] != AMD_ID_LV640U_3) {
 322                                 info->flash_id = FLASH_UNKNOWN;
 323                         }
 324                         else {
 325                                 info->flash_id += FLASH_AMLV640U;
 326                                 info->sector_count = 128;
 327                                 info->size = 0x01000000;
 328                         }
 329                         break;                          /* => 16 MB             */
 330                 default:
 331                         info->flash_id = FLASH_UNKNOWN;
 332                         break;
 333                 }
 334                 break;
 335 # else  /* ! TQM8xxM */
 336         case AMD_ID_LV400T:
 337                 info->flash_id += FLASH_AM400T;
 338                 info->sector_count = 11;
 339                 info->size = 0x00100000;
 340                 break;                          /* => 1 MB              */
 341
 342         case AMD_ID_LV400B:
 343                 info->flash_id += FLASH_AM400B;
 344                 info->sector_count = 11;
 345                 info->size = 0x00100000;
 346                 break;                          /* => 1 MB              */
 347
 348         case AMD_ID_LV800T:
 349                 info->flash_id += FLASH_AM800T;
 350                 info->sector_count = 19;
 351                 info->size = 0x00200000;
 352                 break;                          /* => 2 MB              */
 353
 354         case AMD_ID_LV800B:
 355                 info->flash_id += FLASH_AM800B;
 356                 info->sector_count = 19;
 357                 info->size = 0x00200000;
 358                 break;                          /* => 2 MB              */
 359
 360         case AMD_ID_LV320T:
 361                 info->flash_id += FLASH_AM320T;
 362                 info->sector_count = 71;
 363                 info->size = 0x00800000;
 364                 break;                          /* => 8 MB              */
 365
 366         case AMD_ID_LV320B:
 367                 info->flash_id += FLASH_AM320B;
 368                 info->sector_count = 71;
 369                 info->size = 0x00800000;
 370                 break;                          /* => 8 MB              */
 371 #endif  /* TQM8xxM */
 372
 373         case AMD_ID_LV160T:
 374                 info->flash_id += FLASH_AM160T;
 375                 info->sector_count = 35;
 376                 info->size = 0x00400000;
 377                 break;                          /* => 4 MB              */
 378
 379         case AMD_ID_LV160B:
 380                 info->flash_id += FLASH_AM160B;
 381                 info->sector_count = 35;
 382                 info->size = 0x00400000;
 383                 break;                          /* => 4 MB              */
 384
 385         default:
 386                 info->flash_id = FLASH_UNKNOWN;
 387                 return (0);                     /* => no or unknown flash */
 388         }
 389
 390         /* set up sector start address table */
 391         switch (value) {
 392 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 393         case AMD_ID_MIRROR:
 394                 switch (info->flash_id & FLASH_TYPEMASK) {
 395                         /* only known types here - no default */
 396                 case FLASH_AMLV128U:
 397                 case FLASH_AMLV640U:
 398                 case FLASH_AMLV320U:
 399                         for (i = 0; i < info->sector_count; i++) {
 400                                 info->start[i] = base;
 401                                 base += 0x20000;
 402                         }
 403                         break;
 404                 }
 405                 break;
 406 # else  /* ! TQM8xxM */
 407         case AMD_ID_LV400B:
 408         case AMD_ID_LV800B:
 409                 /* set sector offsets for bottom boot block type        */
 410                 info->start[0] = base + 0x00000000;
 411                 info->start[1] = base + 0x00008000;
 412                 info->start[2] = base + 0x0000C000;
 413                 info->start[3] = base + 0x00010000;
 414                 for (i = 4; i < info->sector_count; i++) {
 415                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 416                 }
 417                 break;
 418         case AMD_ID_LV400T:
 419         case AMD_ID_LV800T:
 420                 /* set sector offsets for top boot block type           */
 421                 i = info->sector_count - 1;
 422                 info->start[i--] = base + info->size - 0x00008000;
 423                 info->start[i--] = base + info->size - 0x0000C000;
 424                 info->start[i--] = base + info->size - 0x00010000;
 425                 for (; i >= 0; i--) {
 426                         info->start[i] = base + i * 0x00020000;
 427                 }
 428                 break;
 429         case AMD_ID_LV320B:
 430                 for (i = 0; i < info->sector_count; i++) {
 431                         info->start[i] = base;
 432                         /*
 433                          * The first 8 sectors are 8 kB,
 434                          * all the other ones  are 64 kB
 435                          */
 436                         base += (i < 8)
 437                                 ?  2 * ( 8 << 10)
 438                                 :  2 * (64 << 10);
 439                 }
 440                 break;
 441         case AMD_ID_LV320T:
 442                 for (i = 0; i < info->sector_count; i++) {
 443                         info->start[i] = base;
 444                         /*
 445                          * The last 8 sectors are 8 kB,
 446                          * all the other ones  are 64 kB
 447                          */
 448                         base += (i < (info->sector_count - 8))
 449                                 ?  2 * (64 << 10)
 450                                 :  2 * ( 8 << 10);
 451                 }
 452                 break;
 453 #endif  /* TQM8xxM */
 454         case AMD_ID_LV160B:
 455                 /* set sector offsets for bottom boot block type        */
 456                 info->start[0] = base + 0x00000000;
 457                 info->start[1] = base + 0x00008000;
 458                 info->start[2] = base + 0x0000C000;
 459                 info->start[3] = base + 0x00010000;
 460                 for (i = 4; i < info->sector_count; i++) {
 461                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 462                 }
 463                 break;
 464         case AMD_ID_LV160T:
 465                 /* set sector offsets for top boot block type           */
 466                 i = info->sector_count - 1;
 467                 info->start[i--] = base + info->size - 0x00008000;
 468                 info->start[i--] = base + info->size - 0x0000C000;
 469                 info->start[i--] = base + info->size - 0x00010000;
 470                 for (; i >= 0; i--) {
 471                         info->start[i] = base + i * 0x00020000;
 472                 }
 473                 break;
 474         default:
 475                 return (0);
 476                 break;
 477         }
 478
 479         /* check for protected sectors */
 480         for (i = 0; i < info->sector_count; i++) {
 481                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 482                 /* D0 = 1 if protected */
 483                 addr = (volatile unsigned long *)(info->start[i]);
 484                 info->protect[i] = addr[2] & 1;
 485         }
 486
 487         /*
 488          * Prevent writes to uninitialized FLASH.
 489          */
 490         if (info->flash_id != FLASH_UNKNOWN) {
 491                 addr = (volatile unsigned long *)info->start[0];
 492
 493                 *addr = 0x00F000F0;     /* reset bank */
 494         }
 495
 496         return (info->size);
 497 }
 498
 499
 500 /*-----------------------------------------------------------------------
 501  */
 502
 503 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 504 {
 505         vu_long *addr = (vu_long*)(info->start[0]);
 506         int flag, prot, sect, l_sect;
 507         ulong start, now, last;
 508
 509         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 510
 511         if ((s_first < 0) || (s_first > s_last)) {
 512                 if (info->flash_id == FLASH_UNKNOWN) {
 513                         printf ("- missing\n");
 514                 } else {
 515                         printf ("- no sectors to erase\n");
 516                 }
 517                 return 1;
 518         }
 519
 520         if ((info->flash_id == FLASH_UNKNOWN) ||
 521             (info->flash_id > FLASH_AMD_COMP)) {
 522                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 523                         info->flash_id);
 524                 return 1;
 525         }
 526
 527         prot = 0;
 528         for (sect=s_first; sect<=s_last; ++sect) {
 529                 if (info->protect[sect]) {
 530                         prot++;
 531                 }
 532         }
 533
 534         if (prot) {
 535                 printf ("- Warning: %d protected sectors will not be erased!\n",
 536                         prot);
 537         } else {
 538                 printf ("\n");
 539         }
 540
 541         l_sect = -1;
 542
 543         /* Disable interrupts which might cause a timeout here */
 544         flag = disable_interrupts();
 545
 546         addr[0x0555] = 0x00AA00AA;
 547         addr[0x02AA] = 0x00550055;
 548         addr[0x0555] = 0x00800080;
 549         addr[0x0555] = 0x00AA00AA;
 550         addr[0x02AA] = 0x00550055;
 551
 552         /* Start erase on unprotected sectors */
 553         for (sect = s_first; sect<=s_last; sect++) {
 554                 if (info->protect[sect] == 0) { /* not protected */
 555                         addr = (vu_long*)(info->start[sect]);
 556                         addr[0] = 0x00300030;
 557                         l_sect = sect;
 558                 }
 559         }
 560
 561         /* re-enable interrupts if necessary */
 562         if (flag)
 563                 enable_interrupts();
 564
 565         /* wait at least 80us - let's wait 1 ms */
 566         udelay (1000);
 567
 568         /*
 569          * We wait for the last triggered sector
 570          */
 571         if (l_sect < 0)
 572                 goto DONE;
 573
 574         start = get_timer (0);
 575         last  = start;
 576         addr = (vu_long*)(info->start[l_sect]);
 577         while ((addr[0] & 0x00800080) != 0x00800080) {
 578                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 579                         printf ("Timeout\n");
 580                         return 1;
 581                 }
 582                 /* show that we're waiting */
 583                 if ((now - last) > 1000) {      /* every second */
 584                         putc ('.');
 585                         last = now;
 586                 }
 587         }
 588
 589 DONE:
 590         /* reset to read mode */
 591         addr = (volatile unsigned long *)info->start[0];
 592         addr[0] = 0x00F000F0;   /* reset bank */
 593
 594         printf (" done\n");
 595         return 0;
 596 }
 597
 598 /*-----------------------------------------------------------------------
 599  * Copy memory to flash, returns:
 600  * 0 - OK
 601  * 1 - write timeout
 602  * 2 - Flash not erased
 603  */
 604
 605 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 606 {
 607         ulong cp, wp, data;
 608         int i, l, rc;
 609
 610         wp = (addr & ~3);       /* get lower word aligned address */
 611
 612         /*
 613          * handle unaligned start bytes
 614          */
 615         if ((l = addr - wp) != 0) {
 616                 data = 0;
 617                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 618                         data = (data << 8) | (*(uchar *)cp);
 619                 }
 620                 for (; i<4 && cnt>0; ++i) {
 621                         data = (data << 8) | *src++;
 622                         --cnt;
 623                         ++cp;
 624                 }
 625                 for (; cnt==0 && i<4; ++i, ++cp) {
 626                         data = (data << 8) | (*(uchar *)cp);
 627                 }
 628
 629                 if ((rc = write_word(info, wp, data)) != 0) {
 630                         return (rc);
 631                 }
 632                 wp += 4;
 633         }
 634
 635         /*
 636          * handle word aligned part
 637          */
 638         while (cnt >= 4) {
 639                 data = 0;
 640                 for (i=0; i<4; ++i) {
 641                         data = (data << 8) | *src++;
 642                 }
 643                 if ((rc = write_word(info, wp, data)) != 0) {
 644                         return (rc);
 645                 }
 646                 wp  += 4;
 647                 cnt -= 4;
 648         }
 649
 650         if (cnt == 0) {
 651                 return (0);
 652         }
 653
 654         /*
 655          * handle unaligned tail bytes
 656          */
 657         data = 0;
 658         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 659                 data = (data << 8) | *src++;
 660                 --cnt;
 661         }
 662         for (; i<4; ++i, ++cp) {
 663                 data = (data << 8) | (*(uchar *)cp);
 664         }
 665
 666         return (write_word(info, wp, data));
 667 }
 668
 669 /*-----------------------------------------------------------------------
 670  * Write a word to Flash, returns:
 671  * 0 - OK
 672  * 1 - write timeout
 673  * 2 - Flash not erased
 674  */
 675 static int write_word (flash_info_t *info, ulong dest, ulong data)
 676 {
 677         vu_long *addr = (vu_long*)(info->start[0]);
 678         ulong start;
 679         int flag;
 680
 681         /* Check if Flash is (sufficiently) erased */
 682         if ((*((vu_long *)dest) & data) != data) {
 683                 return (2);
 684         }
 685         /* Disable interrupts which might cause a timeout here */
 686         flag = disable_interrupts();
 687
 688         addr[0x0555] = 0x00AA00AA;
 689         addr[0x02AA] = 0x00550055;
 690         addr[0x0555] = 0x00A000A0;
 691
 692         *((vu_long *)dest) = data;
 693
 694         /* re-enable interrupts if necessary */
 695         if (flag)
 696                 enable_interrupts();
 697
 698         /* data polling for D7 */
 699         start = get_timer (0);
 700         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 701                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 702                         return (1);
 703                 }
 704         }
 705         return (0);
 706 }
 707
 708 /*-----------------------------------------------------------------------
 709  */