board/mx1fs2/flash.c

   1 /*
   2  * (C) 2000-2004 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   3  * (C) 2003 August Hoeraendl, Logotronic GmbH
   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 #undef CONFIG_FLASH_16BIT
  25
  26 #include <common.h>
  27
  28 #define FLASH_BANK_SIZE MX1FS2_FLASH_BANK_SIZE
  29 #define MAIN_SECT_SIZE  MX1FS2_FLASH_SECT_SIZE
  30
  31 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];   /* info for FLASH chips   */
  32
  33 /*
  34  * NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it
  35  *        has nothing to do with the flash chip being 8-bit or 16-bit.
  36  */
  37 #ifdef CONFIG_FLASH_16BIT
  38 typedef unsigned short FLASH_PORT_WIDTH;
  39 typedef volatile unsigned short FLASH_PORT_WIDTHV;
  40
  41 #define FLASH_ID_MASK   0xFFFF
  42 #else
  43 typedef unsigned long FLASH_PORT_WIDTH;
  44 typedef volatile unsigned long FLASH_PORT_WIDTHV;
  45
  46 #define FLASH_ID_MASK   0xFFFFFFFF
  47 #endif
  48
  49 #define FPW     FLASH_PORT_WIDTH
  50 #define FPWV    FLASH_PORT_WIDTHV
  51
  52 #define ORMASK(size) ((-size) & OR_AM_MSK)
  53
  54 /*-----------------------------------------------------------------------
  55  * Functions
  56  */
  57 #if 0
  58 static ulong flash_get_size(FPWV * addr, flash_info_t * info);
  59 static void flash_get_offsets(ulong base, flash_info_t * info);
  60 #endif
  61 static void flash_reset(flash_info_t * info);
  62 static int write_word_intel(flash_info_t * info, FPWV * dest, FPW data);
  63 static int write_word_amd(flash_info_t * info, FPWV * dest, FPW data);
  64 #define write_word(in, de, da)   write_word_amd(in, de, da)
  65 #ifdef CFG_FLASH_PROTECTION
  66 static void flash_sync_real_protect(flash_info_t * info);
  67 #endif
  68
  69 /*-----------------------------------------------------------------------
  70  * flash_init()
  71  *
  72  * sets up flash_info and returns size of FLASH (bytes)
  73  */
  74 ulong
  75 flash_init(void)
  76 {
  77         int i, j;
  78         ulong size = 0;
  79
  80         for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
  81                 ulong flashbase = 0;
  82                 flash_info[i].flash_id =
  83                     (FLASH_MAN_AMD & FLASH_VENDMASK) |
  84                     (FLASH_AM640U & FLASH_TYPEMASK);
  85                 flash_info[i].size = FLASH_BANK_SIZE;
  86                 flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
  87                 memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
  88                 switch (i) {
  89                 case 0:
  90                         flashbase = MX1FS2_FLASH_BASE;
  91                         break;
  92                 default:
  93                         panic("configured too many flash banks!\n");
  94                         break;
  95                 }
  96                 for (j = 0; j < flash_info[i].sector_count; j++) {
  97                         flash_info[i].start[j] = flashbase + j * MAIN_SECT_SIZE;
  98                 }
  99                 size += flash_info[i].size;
 100         }
 101
 102         /* Protect monitor and environment sectors */
 103         flash_protect(FLAG_PROTECT_SET,
 104                       CFG_FLASH_BASE,
 105                       CFG_FLASH_BASE + _bss_start - _armboot_start,
 106                       &flash_info[0]);
 107
 108         flash_protect(FLAG_PROTECT_SET,
 109                       CFG_ENV_ADDR,
 110                       CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
 111
 112         return size;
 113 }
 114
 115 /*-----------------------------------------------------------------------
 116  */
 117 static void
 118 flash_reset(flash_info_t * info)
 119 {
 120         FPWV *base = (FPWV *) (info->start[0]);
 121
 122         /* Put FLASH back in read mode */
 123         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
 124                 *base = (FPW) 0x00FF00FF;       /* Intel Read Mode */
 125         else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
 126                 *base = (FPW) 0x00F000F0;       /* AMD Read Mode */
 127 }
 128
 129 /*-----------------------------------------------------------------------
 130  */
 131 #if 0
 132 static void
 133 flash_get_offsets(ulong base, flash_info_t * info)
 134 {
 135         int i;
 136
 137         /* set up sector start address table */
 138         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL
 139             && (info->flash_id & FLASH_BTYPE)) {
 140                 int bootsect_size;      /* number of bytes/boot sector  */
 141                 int sect_size;  /* number of bytes/regular sector */
 142
 143                 bootsect_size = 0x00002000 * (sizeof (FPW) / 2);
 144                 sect_size = 0x00010000 * (sizeof (FPW) / 2);
 145
 146                 /* set sector offsets for bottom boot block type        */
 147                 for (i = 0; i < 8; ++i) {
 148                         info->start[i] = base + (i * bootsect_size);
 149                 }
 150                 for (i = 8; i < info->sector_count; i++) {
 151                         info->start[i] = base + ((i - 7) * sect_size);
 152                 }
 153         } else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD
 154                    && (info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U) {
 155
 156                 int sect_size;  /* number of bytes/sector */
 157
 158                 sect_size = 0x00010000 * (sizeof (FPW) / 2);
 159
 160                 /* set up sector start address table (uniform sector type) */
 161                 for (i = 0; i < info->sector_count; i++)
 162                         info->start[i] = base + (i * sect_size);
 163         }
 164 }
 165 #endif /* 0 */
 166
 167 /*-----------------------------------------------------------------------
 168  */
 169
 170 void
 171 flash_print_info(flash_info_t * info)
 172 {
 173         int i;
 174         uchar *boottype;
 175         uchar *bootletter;
 176         char *fmt;
 177         uchar botbootletter[] = "B";
 178         uchar topbootletter[] = "T";
 179         uchar botboottype[] = "bottom boot sector";
 180         uchar topboottype[] = "top boot sector";
 181
 182         if (info->flash_id == FLASH_UNKNOWN) {
 183                 printf("missing or unknown FLASH type\n");
 184                 return;
 185         }
 186
 187         switch (info->flash_id & FLASH_VENDMASK) {
 188         case FLASH_MAN_AMD:
 189                 printf("AMD ");
 190                 break;
 191         case FLASH_MAN_BM:
 192                 printf("BRIGHT MICRO ");
 193                 break;
 194         case FLASH_MAN_FUJ:
 195                 printf("FUJITSU ");
 196                 break;
 197         case FLASH_MAN_SST:
 198                 printf("SST ");
 199                 break;
 200         case FLASH_MAN_STM:
 201                 printf("STM ");
 202                 break;
 203         case FLASH_MAN_INTEL:
 204                 printf("INTEL ");
 205                 break;
 206         default:
 207                 printf("Unknown Vendor ");
 208                 break;
 209         }
 210
 211         /* check for top or bottom boot, if it applies */
 212         if (info->flash_id & FLASH_BTYPE) {
 213                 boottype = botboottype;
 214                 bootletter = botbootletter;
 215         } else {
 216                 boottype = topboottype;
 217                 bootletter = topbootletter;
 218         }
 219
 220         switch (info->flash_id & FLASH_TYPEMASK) {
 221         case FLASH_AM640U:
 222                 fmt = "29LV641D (64 Mbit, uniform sectors)\n";
 223                 break;
 224         case FLASH_28F800C3B:
 225         case FLASH_28F800C3T:
 226                 fmt = "28F800C3%s (8 Mbit, %s)\n";
 227                 break;
 228         case FLASH_INTEL800B:
 229         case FLASH_INTEL800T:
 230                 fmt = "28F800B3%s (8 Mbit, %s)\n";
 231                 break;
 232         case FLASH_28F160C3B:
 233         case FLASH_28F160C3T:
 234                 fmt = "28F160C3%s (16 Mbit, %s)\n";
 235                 break;
 236         case FLASH_INTEL160B:
 237         case FLASH_INTEL160T:
 238                 fmt = "28F160B3%s (16 Mbit, %s)\n";
 239                 break;
 240         case FLASH_28F320C3B:
 241         case FLASH_28F320C3T:
 242                 fmt = "28F320C3%s (32 Mbit, %s)\n";
 243                 break;
 244         case FLASH_INTEL320B:
 245         case FLASH_INTEL320T:
 246                 fmt = "28F320B3%s (32 Mbit, %s)\n";
 247                 break;
 248         case FLASH_28F640C3B:
 249         case FLASH_28F640C3T:
 250                 fmt = "28F640C3%s (64 Mbit, %s)\n";
 251                 break;
 252         case FLASH_INTEL640B:
 253         case FLASH_INTEL640T:
 254                 fmt = "28F640B3%s (64 Mbit, %s)\n";
 255                 break;
 256         default:
 257                 fmt = "Unknown Chip Type\n";
 258                 break;
 259         }
 260
 261         printf(fmt, bootletter, boottype);
 262
 263         printf("  Size: %ld MB in %d Sectors\n",
 264                info->size >> 20, info->sector_count);
 265
 266         printf("  Sector Start Addresses:");
 267
 268         for (i = 0; i < info->sector_count; ++i) {
 269                 if ((i % 5) == 0) {
 270                         printf("\n   ");
 271                 }
 272
 273                 printf(" %08lX%s", info->start[i],
 274                        info->protect[i] ? " (RO)" : "     ");
 275         }
 276
 277         printf("\n");
 278 }
 279
 280 /*-----------------------------------------------------------------------
 281  */
 282
 283 /*
 284  * The following code cannot be run from FLASH!
 285  */
 286
 287 #if 0
 288 ulong
 289 flash_get_size(FPWV * addr, flash_info_t * info)
 290 {
 291         /* Write auto select command: read Manufacturer ID */
 292
 293         /* Write auto select command sequence and test FLASH answer */
 294         addr[0x0555] = (FPW) 0x00AA00AA;        /* for AMD, Intel ignores this */
 295         addr[0x02AA] = (FPW) 0x00550055;        /* for AMD, Intel ignores this */
 296         addr[0x0555] = (FPW) 0x00900090;        /* selects Intel or AMD */
 297
 298         /* The manufacturer codes are only 1 byte, so just use 1 byte.
 299          * This works for any bus width and any FLASH device width.
 300          */
 301         switch (addr[0] & 0xff) {
 302
 303         case (uchar) AMD_MANUFACT:
 304                 info->flash_id = FLASH_MAN_AMD;
 305                 break;
 306
 307         case (uchar) INTEL_MANUFACT:
 308                 info->flash_id = FLASH_MAN_INTEL;
 309                 break;
 310
 311         default:
 312                 info->flash_id = FLASH_UNKNOWN;
 313                 info->sector_count = 0;
 314                 info->size = 0;
 315                 break;
 316         }
 317
 318         /* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
 319         if (info->flash_id != FLASH_UNKNOWN)
 320                 switch (addr[1]) {
 321
 322                 case (FPW) AMD_ID_LV640U:       /* 29LV640 and 29LV641 have same ID */
 323                         info->flash_id += FLASH_AM640U;
 324                         info->sector_count = 128;
 325                         info->size = 0x00800000 * (sizeof (FPW) / 2);
 326                         break;  /* => 8 or 16 MB        */
 327
 328                 case (FPW) INTEL_ID_28F800C3B:
 329                         info->flash_id += FLASH_28F800C3B;
 330                         info->sector_count = 23;
 331                         info->size = 0x00100000 * (sizeof (FPW) / 2);
 332                         break;  /* => 1 or 2 MB         */
 333
 334                 case (FPW) INTEL_ID_28F800B3B:
 335                         info->flash_id += FLASH_INTEL800B;
 336                         info->sector_count = 23;
 337                         info->size = 0x00100000 * (sizeof (FPW) / 2);
 338                         break;  /* => 1 or 2 MB         */
 339
 340                 case (FPW) INTEL_ID_28F160C3B:
 341                         info->flash_id += FLASH_28F160C3B;
 342                         info->sector_count = 39;
 343                         info->size = 0x00200000 * (sizeof (FPW) / 2);
 344                         break;  /* => 2 or 4 MB         */
 345
 346                 case (FPW) INTEL_ID_28F160B3B:
 347                         info->flash_id += FLASH_INTEL160B;
 348                         info->sector_count = 39;
 349                         info->size = 0x00200000 * (sizeof (FPW) / 2);
 350                         break;  /* => 2 or 4 MB         */
 351
 352                 case (FPW) INTEL_ID_28F320C3B:
 353                         info->flash_id += FLASH_28F320C3B;
 354                         info->sector_count = 71;
 355                         info->size = 0x00400000 * (sizeof (FPW) / 2);
 356                         break;  /* => 4 or 8 MB         */
 357
 358                 case (FPW) INTEL_ID_28F320B3B:
 359                         info->flash_id += FLASH_INTEL320B;
 360                         info->sector_count = 71;
 361                         info->size = 0x00400000 * (sizeof (FPW) / 2);
 362                         break;  /* => 4 or 8 MB         */
 363
 364                 case (FPW) INTEL_ID_28F640C3B:
 365                         info->flash_id += FLASH_28F640C3B;
 366                         info->sector_count = 135;
 367                         info->size = 0x00800000 * (sizeof (FPW) / 2);
 368                         break;  /* => 8 or 16 MB        */
 369
 370                 case (FPW) INTEL_ID_28F640B3B:
 371                         info->flash_id += FLASH_INTEL640B;
 372                         info->sector_count = 135;
 373                         info->size = 0x00800000 * (sizeof (FPW) / 2);
 374                         break;  /* => 8 or 16 MB        */
 375
 376                 default:
 377                         info->flash_id = FLASH_UNKNOWN;
 378                         info->sector_count = 0;
 379                         info->size = 0;
 380                         return (0);     /* => no or unknown flash */
 381                 }
 382
 383         flash_get_offsets((ulong) addr, info);
 384
 385         /* Put FLASH back in read mode */
 386         flash_reset(info);
 387
 388         return (info->size);
 389 }
 390 #endif /* 0 */
 391
 392 #ifdef CFG_FLASH_PROTECTION
 393 /*-----------------------------------------------------------------------
 394  */
 395
 396 static void
 397 flash_sync_real_protect(flash_info_t * info)
 398 {
 399         FPWV *addr = (FPWV *) (info->start[0]);
 400         FPWV *sect;
 401         int i;
 402
 403         switch (info->flash_id & FLASH_TYPEMASK) {
 404         case FLASH_28F800C3B:
 405         case FLASH_28F800C3T:
 406         case FLASH_28F160C3B:
 407         case FLASH_28F160C3T:
 408         case FLASH_28F320C3B:
 409         case FLASH_28F320C3T:
 410         case FLASH_28F640C3B:
 411         case FLASH_28F640C3T:
 412                 /* check for protected sectors */
 413                 *addr = (FPW) 0x00900090;
 414                 for (i = 0; i < info->sector_count; i++) {
 415                         /* read sector protection at sector address, (A7 .. A0) = 0x02.
 416                          * D0 = 1 for each device if protected.
 417                          * If at least one device is protected the sector is marked
 418                          * protected, but mixed protected and  unprotected devices
 419                          * within a sector should never happen.
 420                          */
 421                         sect = (FPWV *) (info->start[i]);
 422                         info->protect[i] =
 423                             (sect[2] & (FPW) (0x00010001)) ? 1 : 0;
 424                 }
 425
 426                 /* Put FLASH back in read mode */
 427                 flash_reset(info);
 428                 break;
 429
 430         case FLASH_AM640U:
 431         default:
 432                 /* no hardware protect that we support */
 433                 break;
 434         }
 435 }
 436 #endif
 437
 438 /*-----------------------------------------------------------------------
 439  */
 440
 441 int
 442 flash_erase(flash_info_t * info, int s_first, int s_last)
 443 {
 444         FPWV *addr;
 445         int flag, prot, sect;
 446         int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
 447         ulong start, now, last;
 448         int rcode = 0;
 449
 450         if ((s_first < 0) || (s_first > s_last)) {
 451                 if (info->flash_id == FLASH_UNKNOWN) {
 452                         printf("- missing\n");
 453                 } else {
 454                         printf("- no sectors to erase\n");
 455                 }
 456                 return 1;
 457         }
 458
 459         switch (info->flash_id & FLASH_TYPEMASK) {
 460         case FLASH_INTEL800B:
 461         case FLASH_INTEL160B:
 462         case FLASH_INTEL320B:
 463         case FLASH_INTEL640B:
 464         case FLASH_28F800C3B:
 465         case FLASH_28F160C3B:
 466         case FLASH_28F320C3B:
 467         case FLASH_28F640C3B:
 468         case FLASH_AM640U:
 469                 break;
 470         case FLASH_UNKNOWN:
 471         default:
 472                 printf("Can't erase unknown flash type %08lx - aborted\n",
 473                        info->flash_id);
 474                 return 1;
 475         }
 476
 477         prot = 0;
 478         for (sect = s_first; sect <= s_last; ++sect) {
 479                 if (info->protect[sect]) {
 480                         prot++;
 481                 }
 482         }
 483
 484         if (prot) {
 485                 printf("- Warning: %d protected sectors will not be erased!\n",
 486                        prot);
 487         } else {
 488                 printf("\n");
 489         }
 490
 491         start = get_timer(0);
 492         last = start;
 493
 494         /* Start erase on unprotected sectors */
 495         for (sect = s_first; sect <= s_last && rcode == 0; sect++) {
 496
 497                 if (info->protect[sect] != 0)   /* protected, skip it */
 498                         continue;
 499
 500                 /* Disable interrupts which might cause a timeout here */
 501                 flag = disable_interrupts();
 502
 503                 addr = (FPWV *) (info->start[sect]);
 504                 if (intel) {
 505                         *addr = (FPW) 0x00500050;       /* clear status register */
 506                         *addr = (FPW) 0x00200020;       /* erase setup */
 507                         *addr = (FPW) 0x00D000D0;       /* erase confirm */
 508                 } else {
 509                         /* must be AMD style if not Intel */
 510                         FPWV *base;     /* first address in bank */
 511
 512                         base = (FPWV *) (info->start[0]);
 513                         base[0x0555] = (FPW) 0x00AA00AA;        /* unlock */
 514                         base[0x02AA] = (FPW) 0x00550055;        /* unlock */
 515                         base[0x0555] = (FPW) 0x00800080;        /* erase mode */
 516                         base[0x0555] = (FPW) 0x00AA00AA;        /* unlock */
 517                         base[0x02AA] = (FPW) 0x00550055;        /* unlock */
 518                         *addr = (FPW) 0x00300030;       /* erase sector */
 519                 }
 520
 521                 /* re-enable interrupts if necessary */
 522                 if (flag)
 523                         enable_interrupts();
 524
 525                 /* wait at least 50us for AMD, 80us for Intel.
 526                  * Let's wait 1 ms.
 527                  */
 528                 udelay(1000);
 529
 530                 while ((*addr & (FPW) 0x00800080) != (FPW) 0x00800080) {
 531                         if ((now = get_timer(0)) - start > CFG_FLASH_ERASE_TOUT) {
 532                                 printf("Timeout\n");
 533
 534                                 if (intel) {
 535                                         /* suspend erase        */
 536                                         *addr = (FPW) 0x00B000B0;
 537                                 }
 538
 539                                 flash_reset(info);      /* reset to read mode */
 540                                 rcode = 1;      /* failed */
 541                                 break;
 542                         }
 543
 544                         /* show that we're waiting */
 545                         if ((now - last) > 1000) {      /* every second */
 546                                 putc('.');
 547                                 last = now;
 548                         }
 549                 }
 550
 551                 flash_reset(info);      /* reset to read mode   */
 552         }
 553
 554         printf(" done\n");
 555         return rcode;
 556 }
 557
 558 /*-----------------------------------------------------------------------
 559  * Copy memory to flash, returns:
 560  * 0 - OK
 561  * 1 - write timeout
 562  * 2 - Flash not erased
 563  */
 564 int
 565 bad_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 566 {
 567         FPW data = 0;           /* 16 or 32 bit word, matches flash bus width on MPC8XX */
 568         int bytes;              /* number of bytes to program in current word         */
 569         int left;               /* number of bytes left to program                    */
 570         int i, res;
 571
 572         for (left = cnt, res = 0;
 573              left > 0 && res == 0;
 574              addr += sizeof (data), left -= sizeof (data) - bytes) {
 575
 576                 bytes = addr & (sizeof (data) - 1);
 577                 addr &= ~(sizeof (data) - 1);
 578
 579                 /* combine source and destination data so can program
 580                  * an entire word of 16 or 32 bits
 581                  */
 582                 for (i = 0; i < sizeof (data); i++) {
 583                         data <<= 8;
 584                         if (i < bytes || i - bytes >= left)
 585                                 data += *((uchar *) addr + i);
 586                         else
 587                                 data += *src++;
 588                 }
 589
 590                 /* write one word to the flash */
 591                 switch (info->flash_id & FLASH_VENDMASK) {
 592                 case FLASH_MAN_AMD:
 593                         res = write_word_amd(info, (FPWV *) addr, data);
 594                         break;
 595                 case FLASH_MAN_INTEL:
 596                         res = write_word_intel(info, (FPWV *) addr, data);
 597                         break;
 598                 default:
 599                         /* unknown flash type, error! */
 600                         printf("missing or unknown FLASH type\n");
 601                         res = 1;        /* not really a timeout, but gives error */
 602                         break;
 603                 }
 604         }
 605
 606         return (res);
 607 }
 608
 609 /**
 610  * write_buf: - Copy memory to flash.
 611  *
 612  * @param info:
 613  * @param src:  source of copy transaction
 614  * @param addr: where to copy to
 615  * @param cnt:  number of bytes to copy
 616  *
 617  * @return      error code
 618  */
 619
 620 int
 621 write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 622 {
 623         ulong cp, wp;
 624         FPW data;
 625         int l;
 626         int i, rc;
 627
 628         wp = (addr & ~1);       /* get lower word aligned address */
 629
 630         /* handle unaligned start bytes */
 631         if ((l = addr - wp) != 0) {
 632                 data = 0;
 633                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 634                         data = (data >> 8) | (*(uchar *) cp << 8);
 635                 }
 636                 for (; i < 2 && cnt > 0; ++i) {
 637                         data = (data >> 8) | (*src++ << 8);
 638                         --cnt;
 639                         ++cp;
 640                 }
 641                 for (; cnt == 0 && i < 2; ++i, ++cp) {
 642                         data = (data >> 8) | (*(uchar *) cp << 8);
 643                 }
 644
 645                 if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
 646                         return (rc);
 647                 }
 648                 wp += 2;
 649         }
 650
 651         /* handle word aligned part */
 652         while (cnt >= 2) {
 653                 /* data = *((vushort*)src); */
 654                 data = *((FPW *) src);
 655                 if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
 656                         return (rc);
 657                 }
 658                 src += sizeof (FPW);
 659                 wp += sizeof (FPW);
 660                 cnt -= sizeof (FPW);
 661         }
 662
 663         if (cnt == 0)
 664                 return ERR_OK;
 665
 666         /*
 667          * handle unaligned tail bytes
 668          */
 669         data = 0;
 670         for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
 671                 data = (data >> 8) | (*src++ << 8);
 672                 --cnt;
 673         }
 674         for (; i < 2; ++i, ++cp) {
 675                 data = (data >> 8) | (*(uchar *) cp << 8);
 676         }
 677
 678         return write_word(info, (FPWV *)wp, data);
 679 }
 680
 681 /*-----------------------------------------------------------------------
 682  * Write a word to Flash for AMD FLASH
 683  * A word is 16 or 32 bits, whichever the bus width of the flash bank
 684  * (not an individual chip) is.
 685  *
 686  * returns:
 687  * 0 - OK
 688  * 1 - write timeout
 689  * 2 - Flash not erased
 690  */
 691 static int
 692 write_word_amd(flash_info_t * info, FPWV * dest, FPW data)
 693 {
 694         ulong start;
 695         int flag;
 696         int res = 0;            /* result, assume success       */
 697         FPWV *base;             /* first address in flash bank  */
 698
 699         /* Check if Flash is (sufficiently) erased */
 700         if ((*dest & data) != data) {
 701                 return (2);
 702         }
 703
 704         base = (FPWV *) (info->start[0]);
 705         /* Disable interrupts which might cause a timeout here */
 706         flag = disable_interrupts();
 707
 708         base[0x0555] = (FPW) 0x00AA00AA;        /* unlock */
 709         base[0x02AA] = (FPW) 0x00550055;        /* unlock */
 710         base[0x0555] = (FPW) 0x00A000A0;        /* selects program mode */
 711
 712         *dest = data;           /* start programming the data   */
 713
 714         /* re-enable interrupts if necessary */
 715         if (flag)
 716                 enable_interrupts();
 717
 718         start = get_timer(0);
 719
 720         /* data polling for D7 */
 721         while (res == 0
 722                && (*dest & (FPW) 0x00800080) != (data & (FPW) 0x00800080)) {
 723                 if (get_timer(0) - start > CFG_FLASH_WRITE_TOUT) {
 724                         *dest = (FPW) 0x00F000F0;       /* reset bank */
 725                         printf("SHA timeout\n");
 726                         res = 1;
 727                 }
 728         }
 729
 730         return (res);
 731 }
 732
 733 /*-----------------------------------------------------------------------
 734  * Write a word to Flash for Intel FLASH
 735  * A word is 16 or 32 bits, whichever the bus width of the flash bank
 736  * (not an individual chip) is.
 737  *
 738  * returns:
 739  * 0 - OK
 740  * 1 - write timeout
 741  * 2 - Flash not erased
 742  */
 743 static int
 744 write_word_intel(flash_info_t * info, FPWV * dest, FPW data)
 745 {
 746         ulong start;
 747         int flag;
 748         int res = 0;            /* result, assume success       */
 749
 750         /* Check if Flash is (sufficiently) erased */
 751         if ((*dest & data) != data) {
 752                 return (2);
 753         }
 754
 755         /* Disable interrupts which might cause a timeout here */
 756         flag = disable_interrupts();
 757
 758         *dest = (FPW) 0x00500050;       /* clear status register        */
 759         *dest = (FPW) 0x00FF00FF;       /* make sure in read mode       */
 760         *dest = (FPW) 0x00400040;       /* program setup                */
 761
 762         *dest = data;           /* start programming the data   */
 763
 764         /* re-enable interrupts if necessary */
 765         if (flag)
 766                 enable_interrupts();
 767
 768         start = get_timer(0);
 769
 770         while (res == 0 && (*dest & (FPW) 0x00800080) != (FPW) 0x00800080) {
 771                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 772                         *dest = (FPW) 0x00B000B0;       /* Suspend program      */
 773                         res = 1;
 774                 }
 775         }
 776
 777         if (res == 0 && (*dest & (FPW) 0x00100010))
 778                 res = 1;        /* write failed, time out error is close enough */
 779
 780         *dest = (FPW) 0x00500050;       /* clear status register        */
 781         *dest = (FPW) 0x00FF00FF;       /* make sure in read mode       */
 782
 783         return (res);
 784 }
 785
 786 #ifdef CFG_FLASH_PROTECTION
 787 /*-----------------------------------------------------------------------
 788  */
 789 int
 790 flash_real_protect(flash_info_t * info, long sector, int prot)
 791 {
 792         int rcode = 0;          /* assume success */
 793         FPWV *addr;             /* address of sector */
 794         FPW value;
 795
 796         addr = (FPWV *) (info->start[sector]);
 797
 798         switch (info->flash_id & FLASH_TYPEMASK) {
 799         case FLASH_28F800C3B:
 800         case FLASH_28F800C3T:
 801         case FLASH_28F160C3B:
 802         case FLASH_28F160C3T:
 803         case FLASH_28F320C3B:
 804         case FLASH_28F320C3T:
 805         case FLASH_28F640C3B:
 806         case FLASH_28F640C3T:
 807                 flash_reset(info);      /* make sure in read mode */
 808                 *addr = (FPW) 0x00600060L;      /* lock command setup */
 809                 if (prot)
 810                         *addr = (FPW) 0x00010001L;      /* lock sector */
 811                 else
 812                         *addr = (FPW) 0x00D000D0L;      /* unlock sector */
 813                 flash_reset(info);      /* reset to read mode */
 814
 815                 /* now see if it really is locked/unlocked as requested */
 816                 *addr = (FPW) 0x00900090;
 817                 /* read sector protection at sector address, (A7 .. A0) = 0x02.
 818                  * D0 = 1 for each device if protected.
 819                  * If at least one device is protected the sector is marked
 820                  * protected, but return failure. Mixed protected and
 821                  * unprotected devices within a sector should never happen.
 822                  */
 823                 value = addr[2] & (FPW) 0x00010001;
 824                 if (value == 0)
 825                         info->protect[sector] = 0;
 826                 else if (value == (FPW) 0x00010001)
 827                         info->protect[sector] = 1;
 828                 else {
 829                         /* error, mixed protected and unprotected */
 830                         rcode = 1;
 831                         info->protect[sector] = 1;
 832                 }
 833                 if (info->protect[sector] != prot)
 834                         rcode = 1;      /* failed to protect/unprotect as requested */
 835
 836                 /* reload all protection bits from hardware for now */
 837                 flash_sync_real_protect(info);
 838                 break;
 839
 840         case FLASH_AM640U:
 841         default:
 842                 /* no hardware protect that we support */
 843                 info->protect[sector] = prot;
 844                 break;
 845         }
 846
 847         return rcode;
 848 }
 849 #endif