board/etx094/flash.c

   1 /*
   2  * (C) Copyright 2000
   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 #include <common.h>
  25 #include <mpc8xx.h>
  26
  27 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  28
  29 /*-----------------------------------------------------------------------
  30  * Functions
  31  */
  32 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  33 static int write_word (flash_info_t *info, ulong dest, ulong data);
  34 static void flash_get_offsets (ulong base, flash_info_t *info);
  35
  36 /*-----------------------------------------------------------------------
  37  */
  38
  39 unsigned long flash_init (void)
  40 {
  41         volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  42         volatile memctl8xx_t *memctl = &immap->im_memctl;
  43         unsigned long size_b0, size_b1;
  44         int i;
  45
  46         /* Init: no FLASHes known */
  47         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  48                 flash_info[i].flash_id = FLASH_UNKNOWN;
  49         }
  50
  51         /* Static FLASH Bank configuration here - FIXME XXX */
  52
  53         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  54
  55         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  56                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  57                         size_b0, size_b0<<20);
  58         }
  59
  60         size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
  61
  62         if (size_b1 > size_b0) {
  63                 printf ("## ERROR: "
  64                         "Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
  65                         size_b1, size_b1<<20,
  66                         size_b0, size_b0<<20
  67                 );
  68                 flash_info[0].flash_id  = FLASH_UNKNOWN;
  69                 flash_info[1].flash_id  = FLASH_UNKNOWN;
  70                 flash_info[0].sector_count      = -1;
  71                 flash_info[1].sector_count      = -1;
  72                 flash_info[0].size              = 0;
  73                 flash_info[1].size              = 0;
  74                 return (0);
  75         }
  76
  77         /* Remap FLASH according to real size */
  78         memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
  79 #ifdef CONFIG_FLASH_16BIT
  80         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V | BR_PS_16; /* 16 Bit data port */
  81 #else
  82         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
  83 #endif
  84
  85         /* Re-do sizing to get full correct info */
  86         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
  87
  88         flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
  89
  90 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
  91         /* monitor protection ON by default */
  92         flash_protect(FLAG_PROTECT_SET,
  93                       CFG_MONITOR_BASE,
  94                       CFG_MONITOR_BASE+monitor_flash_len-1,
  95                       &flash_info[0]);
  96 #endif
  97
  98         if (size_b1) {
  99                 memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 100 #ifdef CONFIG_FLASH_16BIT
 101                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 102                                     BR_MS_GPCM | BR_V | BR_PS_16;
 103 #else
 104                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 105                                     BR_MS_GPCM | BR_V;
 106 #endif
 107
 108                 /* Re-do sizing to get full correct info */
 109                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 110                                           &flash_info[1]);
 111
 112                 flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);
 113
 114 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 115                 /* monitor protection ON by default */
 116                 flash_protect(FLAG_PROTECT_SET,
 117                               CFG_MONITOR_BASE,
 118                               CFG_MONITOR_BASE+monitor_flash_len-1,
 119                               &flash_info[1]);
 120 #endif
 121         } else {
 122                 memctl->memc_br1 = 0;           /* invalidate bank */
 123
 124                 flash_info[1].flash_id = FLASH_UNKNOWN;
 125                 flash_info[1].sector_count = -1;
 126         }
 127
 128         flash_info[0].size = size_b0;
 129         flash_info[1].size = size_b1;
 130
 131         return (size_b0 + size_b1);
 132 }
 133
 134 /*-----------------------------------------------------------------------
 135  */
 136 static void flash_get_offsets (ulong base, flash_info_t *info)
 137 {
 138         int i;
 139
 140         if (info->flash_id == FLASH_UNKNOWN) {
 141                 return;
 142         }
 143
 144         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 145                 for (i = 0; i < info->sector_count; i++) {
 146                         info->start[i] = base + (i * 0x00002000);
 147                 }
 148                 return;
 149         }
 150
 151         /* set up sector start address table */
 152         if (info->flash_id & FLASH_BTYPE) {
 153                 /* set sector offsets for bottom boot block type        */
 154 #ifdef CONFIG_FLASH_16BIT
 155                 info->start[0] = base + 0x00000000;
 156                 info->start[1] = base + 0x00004000;
 157                 info->start[2] = base + 0x00006000;
 158                 info->start[3] = base + 0x00008000;
 159                 for (i = 4; i < info->sector_count; i++) {
 160                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 161 #else
 162                 info->start[0] = base + 0x00000000;
 163                 info->start[1] = base + 0x00008000;
 164                 info->start[2] = base + 0x0000C000;
 165                 info->start[3] = base + 0x00010000;
 166                 for (i = 4; i < info->sector_count; i++) {
 167                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 168 #endif
 169                 }
 170         } else {
 171                 /* set sector offsets for top boot block type           */
 172                 i = info->sector_count - 1;
 173                 info->start[i--] = base + info->size - 0x00008000;
 174                 info->start[i--] = base + info->size - 0x0000C000;
 175                 info->start[i--] = base + info->size - 0x00010000;
 176                 for (; i >= 0; i--) {
 177                         info->start[i] = base + i * 0x00020000;
 178                 }
 179         }
 180
 181 }
 182
 183 /*-----------------------------------------------------------------------
 184  */
 185 void flash_print_info  (flash_info_t *info)
 186 {
 187         int i;
 188
 189         if (info->flash_id == FLASH_UNKNOWN) {
 190                 printf ("missing or unknown FLASH type\n");
 191                 return;
 192         }
 193
 194         switch (info->flash_id & FLASH_VENDMASK) {
 195         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 196         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 197         case FLASH_MAN_SST:     printf ("SST ");                break;
 198         case FLASH_MAN_STM:     printf ("STM ");                break;
 199         default:                printf ("Unknown Vendor ");     break;
 200         }
 201
 202         switch (info->flash_id & FLASH_TYPEMASK) {
 203         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 204                                 break;
 205         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 206                                 break;
 207         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 208                                 break;
 209         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 210                                 break;
 211         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 212                                 break;
 213         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 214                                 break;
 215         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 216                                 break;
 217         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 218                                 break;
 219         case FLASH_SST200A:     printf ("39xF200A (2M = 128K x 16)\n");
 220                                 break;
 221         case FLASH_SST400A:     printf ("39xF400A (4M = 256K x 16)\n");
 222                                 break;
 223         case FLASH_SST800A:     printf ("39xF800A (8M = 512K x 16)\n");
 224                                 break;
 225         case FLASH_STM800AB:    printf ("M29W800AB (8M = 512K x 16)\n");
 226                                 break;
 227         default:                printf ("Unknown Chip Type\n");
 228                                 break;
 229         }
 230
 231         printf ("  Size: %ld MB in %d Sectors\n",
 232                 info->size >> 20, info->sector_count);
 233
 234         printf ("  Sector Start Addresses:");
 235         for (i=0; i<info->sector_count; ++i) {
 236                 if ((i % 5) == 0)
 237                         printf ("\n   ");
 238                 printf (" %08lX%s",
 239                         info->start[i],
 240                         info->protect[i] ? " (RO)" : "     "
 241                 );
 242         }
 243         printf ("\n");
 244         return;
 245 }
 246
 247 /*-----------------------------------------------------------------------
 248  */
 249
 250
 251 /*-----------------------------------------------------------------------
 252  */
 253
 254 /*
 255  * The following code cannot be run from FLASH!
 256  */
 257
 258 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 259 {
 260         short i;
 261         ulong value;
 262         ulong base = (ulong)addr;
 263
 264         /* Write auto select command: read Manufacturer ID */
 265 #ifdef CONFIG_FLASH_16BIT
 266         vu_short *s_addr = (vu_short*)addr;
 267         s_addr[0x5555] = 0x00AA;
 268         s_addr[0x2AAA] = 0x0055;
 269         s_addr[0x5555] = 0x0090;
 270         value = s_addr[0];
 271         value = value|(value<<16);
 272 #else
 273         addr[0x5555] = 0x00AA00AA;
 274         addr[0x2AAA] = 0x00550055;
 275         addr[0x5555] = 0x00900090;
 276         value = addr[0];
 277 #endif
 278
 279         switch (value) {
 280         case AMD_MANUFACT:
 281                 info->flash_id = FLASH_MAN_AMD;
 282                 break;
 283         case FUJ_MANUFACT:
 284                 info->flash_id = FLASH_MAN_FUJ;
 285                 break;
 286         case SST_MANUFACT:
 287                 info->flash_id = FLASH_MAN_SST;
 288                 break;
 289         case STM_MANUFACT:
 290                 info->flash_id = FLASH_MAN_STM;
 291                 break;
 292         default:
 293                 info->flash_id = FLASH_UNKNOWN;
 294                 info->sector_count = 0;
 295                 info->size = 0;
 296                 return (0);                     /* no or unknown flash  */
 297         }
 298 #ifdef CONFIG_FLASH_16BIT
 299         value = s_addr[1];
 300         value = value|(value<<16);
 301 #else
 302         value = addr[1];                        /* device ID            */
 303 #endif
 304
 305         switch (value) {
 306         case AMD_ID_LV400T:
 307                 info->flash_id += FLASH_AM400T;
 308                 info->sector_count = 11;
 309                 info->size = 0x00100000;
 310                 break;                          /* => 1 MB              */
 311
 312         case AMD_ID_LV400B:
 313                 info->flash_id += FLASH_AM400B;
 314                 info->sector_count = 11;
 315                 info->size = 0x00100000;
 316                 break;                          /* => 1 MB              */
 317
 318         case AMD_ID_LV800T:
 319                 info->flash_id += FLASH_AM800T;
 320                 info->sector_count = 19;
 321                 info->size = 0x00200000;
 322                 break;                          /* => 2 MB              */
 323
 324         case AMD_ID_LV800B:
 325                 info->flash_id += FLASH_AM800B;
 326 #ifdef CONFIG_FLASH_16BIT
 327                 info->sector_count = 19;
 328                 info->size = 0x00100000;        /* => 1 MB */
 329 #else
 330                 info->sector_count = 19;
 331                 info->size = 0x00200000;        /* => 2 MB      */
 332 #endif
 333                 break;
 334
 335         case AMD_ID_LV160T:
 336                 info->flash_id += FLASH_AM160T;
 337                 info->sector_count = 35;
 338                 info->size = 0x00400000;
 339                 break;                          /* => 4 MB              */
 340
 341         case AMD_ID_LV160B:
 342                 info->flash_id += FLASH_AM160B;
 343 #ifdef CONFIG_FLASH_16BIT
 344                 info->sector_count = 35;
 345                 info->size = 0x00200000;        /* => 2 MB      */
 346 #else
 347                 info->sector_count = 35;
 348                 info->size = 0x00400000;        /* => 4 MB      */
 349 #endif
 350
 351                 break;
 352 #if 0   /* enable when device IDs are available */
 353         case AMD_ID_LV320T:
 354                 info->flash_id += FLASH_AM320T;
 355                 info->sector_count = 67;
 356                 info->size = 0x00800000;
 357                 break;                          /* => 8 MB              */
 358
 359         case AMD_ID_LV320B:
 360                 info->flash_id += FLASH_AM320B;
 361                 info->sector_count = 67;
 362                 info->size = 0x00800000;
 363                 break;                          /* => 8 MB              */
 364 #endif
 365         case SST_ID_xF200A:
 366                 info->flash_id += FLASH_SST200A;
 367                 info->sector_count = 64;        /* 39xF200A ID ( 2M = 128K x 16 ) */
 368                 info->size = 0x00080000;
 369                 break;
 370         case SST_ID_xF400A:
 371                 info->flash_id += FLASH_SST400A;
 372                 info->sector_count = 128;       /* 39xF400A ID ( 4M = 256K x 16 ) */
 373                 info->size = 0x00100000;
 374                 break;
 375         case SST_ID_xF800A:
 376                 info->flash_id += FLASH_SST800A;
 377                 info->sector_count = 256;       /* 39xF800A ID ( 8M = 512K x 16 ) */
 378                 info->size = 0x00200000;
 379                 break;                          /* => 2 MB              */
 380         case STM_ID_x800AB:
 381                 info->flash_id += FLASH_STM800AB;
 382                 info->sector_count = 19;
 383                 info->size = 0x00200000;
 384                 break;                          /* => 2 MB              */
 385         default:
 386                 info->flash_id = FLASH_UNKNOWN;
 387                 return (0);                     /* => no or unknown flash */
 388
 389         }
 390
 391         if (info->sector_count > CFG_MAX_FLASH_SECT) {
 392                 printf ("** ERROR: sector count %d > max (%d) **\n",
 393                         info->sector_count, CFG_MAX_FLASH_SECT);
 394                 info->sector_count = CFG_MAX_FLASH_SECT;
 395         }
 396
 397         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 398                 for (i = 0; i < info->sector_count; i++) {
 399                         info->start[i] = base + (i * 0x00002000);
 400                 }
 401         } else {        /* AMD and Fujitsu types */
 402                 /* set up sector start address table */
 403                 if (info->flash_id & FLASH_BTYPE) {
 404                         /* set sector offsets for bottom boot block type        */
 405 #ifdef CONFIG_FLASH_16BIT
 406
 407                         info->start[0] = base + 0x00000000;
 408                         info->start[1] = base + 0x00004000;
 409                         info->start[2] = base + 0x00006000;
 410                         info->start[3] = base + 0x00008000;
 411                         for (i = 4; i < info->sector_count; i++) {
 412                                 info->start[i] = base + (i * 0x00010000) - 0x00030000;
 413 #else
 414                         info->start[0] = base + 0x00000000;
 415                         info->start[1] = base + 0x00008000;
 416                         info->start[2] = base + 0x0000C000;
 417                         info->start[3] = base + 0x00010000;
 418                         for (i = 4; i < info->sector_count; i++) {
 419                                 info->start[i] = base + (i * 0x00020000) - 0x00060000;
 420 #endif
 421                         }
 422                 } else {
 423                         /* set sector offsets for top boot block type           */
 424                         i = info->sector_count - 1;
 425                         info->start[i--] = base + info->size - 0x00008000;
 426                         info->start[i--] = base + info->size - 0x0000C000;
 427                         info->start[i--] = base + info->size - 0x00010000;
 428                         for (; i >= 0; i--) {
 429                                 info->start[i] = base + i * 0x00020000;
 430                         }
 431                 }
 432
 433                 /* check for protected sectors */
 434                 for (i = 0; i < info->sector_count; i++) {
 435                         /* read sector protection at sector address:
 436                          * (A7 .. A0) = 0x02
 437                          * D0 = 1 if protected
 438                          */
 439 #ifdef CONFIG_FLASH_16BIT
 440                         s_addr = (volatile unsigned short *)(info->start[i]);
 441                         info->protect[i] = s_addr[2] & 1;
 442 #else
 443                         addr = (volatile unsigned long *)(info->start[i]);
 444                         info->protect[i] = addr[2] & 1;
 445 #endif
 446                 }
 447         }
 448
 449         /*
 450          * Prevent writes to uninitialized FLASH.
 451          */
 452         if (info->flash_id != FLASH_UNKNOWN) {
 453 #ifdef CONFIG_FLASH_16BIT
 454                 s_addr = (volatile unsigned short *)(info->start[0]);
 455                 *s_addr = 0x00F0;       /* reset bank */
 456 #else
 457                 addr = (volatile unsigned long *)info->start[0];
 458                 *addr = 0x00F000F0;     /* reset bank */
 459 #endif
 460
 461         }
 462         return (info->size);
 463 }
 464
 465
 466 /*-----------------------------------------------------------------------
 467  */
 468
 469 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 470 {
 471         vu_long *addr = (vu_long*)(info->start[0]);
 472         int flag, prot, sect;
 473         ulong start, now, last;
 474 #ifdef CONFIG_FLASH_16BIT
 475         vu_short *s_addr = (vu_short*)addr;
 476 #endif
 477
 478         if ((s_first < 0) || (s_first > s_last)) {
 479                 if (info->flash_id == FLASH_UNKNOWN) {
 480                         printf ("- missing\n");
 481                 } else {
 482                         printf ("- no sectors to erase\n");
 483                 }
 484                 return 1;
 485         }
 486 /*#ifndef CONFIG_FLASH_16BIT
 487         ulong type;
 488         type = (info->flash_id & FLASH_VENDMASK);
 489         if ((type != FLASH_MAN_SST) && (type != FLASH_MAN_STM)) {
 490                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 491                         info->flash_id);
 492                 return;
 493         }
 494 #endif*/
 495         prot = 0;
 496         for (sect=s_first; sect<=s_last; ++sect) {
 497                 if (info->protect[sect]) {
 498                         prot++;
 499                 }
 500         }
 501
 502         if (prot) {
 503                 printf ("- Warning: %d protected sectors will not be erased!\n",
 504                         prot);
 505         } else {
 506                 printf ("\n");
 507         }
 508
 509         start = get_timer (0);
 510         last  = start;
 511         /* Start erase on unprotected sectors */
 512         for (sect = s_first; sect<=s_last; sect++) {
 513                 if (info->protect[sect] == 0) { /* not protected */
 514 #ifdef CONFIG_FLASH_16BIT
 515                         vu_short *s_sect_addr = (vu_short*)(info->start[sect]);
 516 #else
 517                         vu_long *sect_addr = (vu_long*)(info->start[sect]);
 518 #endif
 519                         /* Disable interrupts which might cause a timeout here */
 520                         flag = disable_interrupts();
 521
 522 #ifdef CONFIG_FLASH_16BIT
 523
 524                         /*printf("\ns_sect_addr=%x",s_sect_addr);*/
 525                         s_addr[0x5555] = 0x00AA;
 526                         s_addr[0x2AAA] = 0x0055;
 527                         s_addr[0x5555] = 0x0080;
 528                         s_addr[0x5555] = 0x00AA;
 529                         s_addr[0x2AAA] = 0x0055;
 530                         s_sect_addr[0] = 0x0030;
 531 #else
 532                         addr[0x5555] = 0x00AA00AA;
 533                         addr[0x2AAA] = 0x00550055;
 534                         addr[0x5555] = 0x00800080;
 535                         addr[0x5555] = 0x00AA00AA;
 536                         addr[0x2AAA] = 0x00550055;
 537                         sect_addr[0] = 0x00300030;
 538 #endif
 539                         /* re-enable interrupts if necessary */
 540                         if (flag)
 541                                 enable_interrupts();
 542
 543                         /* wait at least 80us - let's wait 1 ms */
 544                         udelay (1000);
 545
 546 #ifdef CONFIG_FLASH_16BIT
 547                         while ((s_sect_addr[0] & 0x0080) != 0x0080) {
 548 #else
 549                         while ((sect_addr[0] & 0x00800080) != 0x00800080) {
 550 #endif
 551                                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 552                                         printf ("Timeout\n");
 553                                         return 1;
 554                                 }
 555                                 /* show that we're waiting */
 556                                 if ((now - last) > 1000) {      /* every second */
 557                                         putc ('.');
 558                                         last = now;
 559                                 }
 560                         }
 561                 }
 562         }
 563
 564         /* reset to read mode */
 565         addr = (volatile unsigned long *)info->start[0];
 566 #ifdef CONFIG_FLASH_16BIT
 567         s_addr[0] = 0x00F0;     /* reset bank */
 568 #else
 569         addr[0] = 0x00F000F0;   /* reset bank */
 570 #endif
 571
 572         printf (" done\n");
 573         return 0;
 574 }
 575
 576 /*-----------------------------------------------------------------------
 577  * Copy memory to flash, returns:
 578  * 0 - OK
 579  * 1 - write timeout
 580  * 2 - Flash not erased
 581  * 4 - Flash not identified
 582  */
 583
 584 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 585 {
 586         ulong cp, wp, data;
 587         int i, l, rc;
 588
 589         if (info->flash_id == FLASH_UNKNOWN) {
 590                 return 4;
 591         }
 592
 593         wp = (addr & ~3);       /* get lower word aligned address */
 594
 595         /*
 596          * handle unaligned start bytes
 597          */
 598         if ((l = addr - wp) != 0) {
 599                 data = 0;
 600                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 601                         data = (data << 8) | (*(uchar *)cp);
 602                 }
 603                 for (; i<4 && cnt>0; ++i) {
 604                         data = (data << 8) | *src++;
 605                         --cnt;
 606                         ++cp;
 607                 }
 608                 for (; cnt==0 && i<4; ++i, ++cp) {
 609                         data = (data << 8) | (*(uchar *)cp);
 610                 }
 611
 612                 if ((rc = write_word(info, wp, data)) != 0) {
 613                         return (rc);
 614                 }
 615                 wp += 4;
 616         }
 617
 618         /*
 619          * handle word aligned part
 620          */
 621         while (cnt >= 4) {
 622                 data = 0;
 623                 for (i=0; i<4; ++i) {
 624                         data = (data << 8) | *src++;
 625                 }
 626                 if ((rc = write_word(info, wp, data)) != 0) {
 627                         return (rc);
 628                 }
 629                 wp  += 4;
 630                 cnt -= 4;
 631         }
 632
 633         if (cnt == 0) {
 634                 return (0);
 635         }
 636
 637         /*
 638          * handle unaligned tail bytes
 639          */
 640         data = 0;
 641         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 642                 data = (data << 8) | *src++;
 643                 --cnt;
 644         }
 645         for (; i<4; ++i, ++cp) {
 646                 data = (data << 8) | (*(uchar *)cp);
 647         }
 648
 649         return (write_word(info, wp, data));
 650 }
 651
 652 /*-----------------------------------------------------------------------
 653  * Write a word to Flash, returns:
 654  * 0 - OK
 655  * 1 - write timeout
 656  * 2 - Flash not erased
 657  */
 658 static int write_word (flash_info_t *info, ulong dest, ulong data)
 659 {
 660         vu_long *addr = (vu_long*)(info->start[0]);
 661
 662 #ifdef CONFIG_FLASH_16BIT
 663         vu_short high_data;
 664         vu_short low_data;
 665         vu_short *s_addr = (vu_short*)addr;
 666 #endif
 667         ulong start;
 668         int flag;
 669
 670         /* Check if Flash is (sufficiently) erased */
 671         if ((*((vu_long *)dest) & data) != data) {
 672                 return (2);
 673         }
 674
 675 #ifdef CONFIG_FLASH_16BIT
 676         /* Write the 16 higher-bits */
 677         /* Disable interrupts which might cause a timeout here */
 678         flag = disable_interrupts();
 679
 680         high_data = ((data>>16) & 0x0000ffff);
 681
 682         s_addr[0x5555] = 0x00AA;
 683         s_addr[0x2AAA] = 0x0055;
 684         s_addr[0x5555] = 0x00A0;
 685
 686         *((vu_short *)dest) = high_data;
 687
 688
 689         /* re-enable interrupts if necessary */
 690         if (flag)
 691                 enable_interrupts();
 692
 693         /* data polling for D7 */
 694         start = get_timer (0);
 695         while ((*((vu_short *)dest) & 0x0080) != (high_data & 0x0080)) {
 696                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 697                         return (1);
 698                 }
 699         }
 700
 701
 702         /* Write the 16 lower-bits */
 703 #endif
 704
 705         /* Disable interrupts which might cause a timeout here */
 706         flag = disable_interrupts();
 707 #ifdef CONFIG_FLASH_16BIT
 708         dest += 0x2;
 709         low_data = (data & 0x0000ffff);
 710
 711         s_addr[0x5555] = 0x00AA;
 712         s_addr[0x2AAA] = 0x0055;
 713         s_addr[0x5555] = 0x00A0;
 714         *((vu_short *)dest) = low_data;
 715
 716 #else
 717         addr[0x5555] = 0x00AA00AA;
 718         addr[0x2AAA] = 0x00550055;
 719         addr[0x5555] = 0x00A000A0;
 720         *((vu_long *)dest) = data;
 721 #endif
 722
 723         /* re-enable interrupts if necessary */
 724         if (flag)
 725                 enable_interrupts();
 726
 727         /* data polling for D7 */
 728         start = get_timer (0);
 729
 730 #ifdef CONFIG_FLASH_16BIT
 731         while ((*((vu_short *)dest) & 0x0080) != (low_data & 0x0080)) {
 732 #else
 733         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 734 #endif
 735
 736                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 737                         return (1);
 738                 }
 739         }
 740         return (0);
 741 }
 742
 743 /*-----------------------------------------------------------------------
 744  */