board/bmw/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 <mpc824x.h>
  26 #include <asm/processor.h>
  27 #include <asm/pci_io.h>
  28
  29 #define ROM_CS0_START   0xFF800000
  30 #define ROM_CS1_START   0xFF000000
  31
  32 flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips    */
  33
  34 #if defined(CFG_ENV_IS_IN_FLASH)
  35 # ifndef  CFG_ENV_ADDR
  36 #  define CFG_ENV_ADDR  (CFG_FLASH_BASE + CFG_ENV_OFFSET)
  37 # endif
  38 # ifndef  CFG_ENV_SIZE
  39 #  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
  40 # endif
  41 # ifndef  CFG_ENV_SECT_SIZE
  42 #  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
  43 # endif
  44 #endif
  45
  46 /*-----------------------------------------------------------------------
  47  * Functions
  48  */
  49 static int write_word (flash_info_t *info, ulong dest, ulong data);
  50 #if 0
  51 static void flash_get_offsets (ulong base, flash_info_t *info);
  52 #endif /* 0 */
  53
  54 /*flash command address offsets*/
  55
  56 #if 0
  57 #define ADDR0           (0x555)
  58 #define ADDR1           (0x2AA)
  59 #define ADDR3           (0x001)
  60 #else
  61 #define ADDR0           (0xAAA)
  62 #define ADDR1           (0x555)
  63 #define ADDR3           (0x001)
  64 #endif
  65
  66 #define FLASH_WORD_SIZE unsigned char
  67
  68 /*-----------------------------------------------------------------------
  69  */
  70
  71 #if 0
  72 static int byte_parity_odd(unsigned char x) __attribute__ ((const));
  73 #endif /* 0 */
  74 static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));
  75
  76 typedef struct
  77 {
  78   FLASH_WORD_SIZE extval;
  79   unsigned short intval;
  80 } map_entry;
  81
  82 #if 0
  83 static int
  84 byte_parity_odd(unsigned char x)
  85 {
  86   x ^= x >> 4;
  87   x ^= x >> 2;
  88   x ^= x >> 1;
  89   return (x & 0x1) != 0;
  90 }
  91 #endif /* 0 */
  92
  93
  94 static unsigned long
  95 flash_id(unsigned char mfct, unsigned char chip)
  96 {
  97   static const map_entry mfct_map[] =
  98     {
  99       {(FLASH_WORD_SIZE) AMD_MANUFACT,  (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
 100       {(FLASH_WORD_SIZE) FUJ_MANUFACT,  (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
 101       {(FLASH_WORD_SIZE) STM_MANUFACT,  (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
 102       {(FLASH_WORD_SIZE) MT_MANUFACT,   (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
 103       {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
 104       {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
 105     };
 106
 107   static const map_entry chip_map[] =
 108   {
 109     {AMD_ID_F040B,      FLASH_AM040},
 110     {(FLASH_WORD_SIZE) STM_ID_x800AB,   FLASH_STM800AB}
 111   };
 112
 113   const map_entry *p;
 114   unsigned long result = FLASH_UNKNOWN;
 115
 116   /* find chip id */
 117   for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
 118     if(p->extval == chip)
 119     {
 120       result = FLASH_VENDMASK | p->intval;
 121       break;
 122     }
 123
 124   /* find vendor id */
 125   for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
 126     if(p->extval == mfct)
 127     {
 128       result &= ~FLASH_VENDMASK;
 129       result |= (unsigned long) p->intval << 16;
 130       break;
 131     }
 132
 133   return result;
 134 }
 135
 136
 137 unsigned long
 138 flash_init(void)
 139 {
 140   unsigned long i;
 141   unsigned char j;
 142   static const ulong flash_banks[] = CFG_FLASH_BANKS;
 143
 144   /* Init: no FLASHes known */
 145   for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
 146   {
 147     flash_info_t * const pflinfo = &flash_info[i];
 148     pflinfo->flash_id = FLASH_UNKNOWN;
 149     pflinfo->size = 0;
 150     pflinfo->sector_count = 0;
 151   }
 152
 153   for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
 154   {
 155     flash_info_t * const pflinfo = &flash_info[i];
 156     const unsigned long base_address = flash_banks[i];
 157     volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
 158 #if 0
 159     volatile FLASH_WORD_SIZE * addr2;
 160 #endif
 161 #if 0
 162     /* write autoselect sequence */
 163     flash[0x5555] = 0xaa;
 164     flash[0x2aaa] = 0x55;
 165     flash[0x5555] = 0x90;
 166 #else
 167     flash[0xAAA << (3 * i)] = 0xaa;
 168     flash[0x555 << (3 * i)] = 0x55;
 169     flash[0xAAA << (3 * i)] = 0x90;
 170 #endif
 171     __asm__ __volatile__("sync");
 172
 173 #if 0
 174     pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
 175 #else
 176     pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
 177 #endif
 178
 179     switch(pflinfo->flash_id & FLASH_TYPEMASK)
 180     {
 181       case FLASH_AM040:
 182         pflinfo->size = 0x00080000;
 183         pflinfo->sector_count = 8;
 184         for(j = 0; j < 8; j++)
 185         {
 186           pflinfo->start[j] = base_address + 0x00010000 * j;
 187           pflinfo->protect[j] = flash[(j << 16) | 0x2];
 188         }
 189         break;
 190       case FLASH_STM800AB:
 191         pflinfo->size = 0x00100000;
 192         pflinfo->sector_count = 19;
 193         pflinfo->start[0] = base_address;
 194         pflinfo->start[1] = base_address + 0x4000;
 195         pflinfo->start[2] = base_address + 0x6000;
 196         pflinfo->start[3] = base_address + 0x8000;
 197         for(j = 1; j < 16; j++)
 198         {
 199           pflinfo->start[j+3] = base_address + 0x00010000 * j;
 200         }
 201 #if 0
 202         /* check for protected sectors */
 203         for (j = 0; j < pflinfo->sector_count; j++) {
 204           /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 205           /* D0 = 1 if protected */
 206           addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
 207             if (pflinfo->flash_id & FLASH_MAN_SST)
 208               pflinfo->protect[j] = 0;
 209             else
 210               pflinfo->protect[j] = addr2[2] & 1;
 211         }
 212 #endif
 213         break;
 214     }
 215     /* Protect monitor and environment sectors
 216      */
 217 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 218     flash_protect(FLAG_PROTECT_SET,
 219                 CFG_MONITOR_BASE,
 220                 CFG_MONITOR_BASE + monitor_flash_len - 1,
 221                 &flash_info[0]);
 222 #endif
 223
 224 #if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
 225     flash_protect(FLAG_PROTECT_SET,
 226                 CFG_ENV_ADDR,
 227                 CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
 228                 &flash_info[0]);
 229 #endif
 230
 231     /* reset device to read mode */
 232     flash[0x0000] = 0xf0;
 233     __asm__ __volatile__("sync");
 234   }
 235
 236     return flash_info[0].size + flash_info[1].size;
 237 }
 238
 239 #if 0
 240 static void
 241 flash_get_offsets (ulong base, flash_info_t *info)
 242 {
 243     int i;
 244
 245     /* set up sector start address table */
 246         if (info->flash_id & FLASH_MAN_SST)
 247           {
 248             for (i = 0; i < info->sector_count; i++)
 249               info->start[i] = base + (i * 0x00010000);
 250           }
 251         else
 252     if (info->flash_id & FLASH_BTYPE) {
 253         /* set sector offsets for bottom boot block type    */
 254         info->start[0] = base + 0x00000000;
 255         info->start[1] = base + 0x00004000;
 256         info->start[2] = base + 0x00006000;
 257         info->start[3] = base + 0x00008000;
 258         for (i = 4; i < info->sector_count; i++) {
 259             info->start[i] = base + (i * 0x00010000) - 0x00030000;
 260         }
 261     } else {
 262         /* set sector offsets for top boot block type       */
 263         i = info->sector_count - 1;
 264         info->start[i--] = base + info->size - 0x00004000;
 265         info->start[i--] = base + info->size - 0x00006000;
 266         info->start[i--] = base + info->size - 0x00008000;
 267         for (; i >= 0; i--) {
 268             info->start[i] = base + i * 0x00010000;
 269         }
 270     }
 271
 272 }
 273 #endif /* 0 */
 274
 275 /*-----------------------------------------------------------------------
 276  */
 277 void
 278 flash_print_info(flash_info_t *info)
 279 {
 280   static const char unk[] = "Unknown";
 281   const char *mfct = unk, *type = unk;
 282   unsigned int i;
 283
 284   if(info->flash_id != FLASH_UNKNOWN)
 285   {
 286     switch(info->flash_id & FLASH_VENDMASK)
 287     {
 288       case FLASH_MAN_AMD:       mfct = "AMD";                           break;
 289       case FLASH_MAN_FUJ:       mfct = "FUJITSU";                       break;
 290       case FLASH_MAN_STM:       mfct = "STM";                           break;
 291       case FLASH_MAN_SST:       mfct = "SST";                           break;
 292       case FLASH_MAN_BM:        mfct = "Bright Microelectonics";        break;
 293       case FLASH_MAN_INTEL:     mfct = "Intel";                         break;
 294     }
 295
 296     switch(info->flash_id & FLASH_TYPEMASK)
 297     {
 298       case FLASH_AM040:         type = "AM29F040B (512K * 8, uniform sector size)";     break;
 299       case FLASH_AM400B:        type = "AM29LV400B (4 Mbit, bottom boot sect)";         break;
 300       case FLASH_AM400T:        type = "AM29LV400T (4 Mbit, top boot sector)";          break;
 301       case FLASH_AM800B:        type = "AM29LV800B (8 Mbit, bottom boot sect)";         break;
 302       case FLASH_AM800T:        type = "AM29LV800T (8 Mbit, top boot sector)";          break;
 303       case FLASH_AM160T:        type = "AM29LV160T (16 Mbit, top boot sector)";         break;
 304       case FLASH_AM320B:        type = "AM29LV320B (32 Mbit, bottom boot sect)";        break;
 305       case FLASH_AM320T:        type = "AM29LV320T (32 Mbit, top boot sector)";         break;
 306       case FLASH_STM800AB:      type = "M29W800AB (8 Mbit, bottom boot sect)";          break;
 307       case FLASH_SST800A:       type = "SST39LF/VF800 (8 Mbit, uniform sector size)";   break;
 308       case FLASH_SST160A:       type = "SST39LF/VF160 (16 Mbit, uniform sector size)";  break;
 309     }
 310   }
 311
 312   printf(
 313     "\n  Brand: %s Type: %s\n"
 314     "  Size: %lu KB in %d Sectors\n",
 315     mfct,
 316     type,
 317     info->size >> 10,
 318     info->sector_count
 319   );
 320
 321   printf ("  Sector Start Addresses:");
 322
 323   for (i = 0; i < info->sector_count; i++)
 324   {
 325     unsigned long size;
 326     unsigned int erased;
 327     unsigned long * flash = (unsigned long *) info->start[i];
 328
 329     /*
 330      * Check if whole sector is erased
 331      */
 332     size =
 333       (i != (info->sector_count - 1)) ?
 334       (info->start[i + 1] - info->start[i]) >> 2 :
 335       (info->start[0] + info->size - info->start[i]) >> 2;
 336
 337     for(
 338       flash = (unsigned long *) info->start[i], erased = 1;
 339       (flash != (unsigned long *) info->start[i] + size) && erased;
 340       flash++
 341     )
 342       erased = *flash == ~0x0UL;
 343
 344     printf(
 345       "%s %08lX %s %s",
 346       (i % 5) ? "" : "\n   ",
 347       info->start[i],
 348       erased ? "E" : " ",
 349       info->protect[i] ? "RO" : "  "
 350     );
 351   }
 352
 353   puts("\n");
 354   return;
 355 }
 356
 357 #if 0
 358
 359 /*
 360  * The following code cannot be run from FLASH!
 361  */
 362 ulong
 363 flash_get_size (vu_long *addr, flash_info_t *info)
 364 {
 365    short i;
 366     FLASH_WORD_SIZE value;
 367     ulong base = (ulong)addr;
 368         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
 369
 370     printf("flash_get_size: \n");
 371     /* Write auto select command: read Manufacturer ID */
 372     eieio();
 373     addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
 374     addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
 375     addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
 376     value = addr2[0];
 377
 378     switch (value) {
 379     case (FLASH_WORD_SIZE)AMD_MANUFACT:
 380         info->flash_id = FLASH_MAN_AMD;
 381         break;
 382     case (FLASH_WORD_SIZE)FUJ_MANUFACT:
 383         info->flash_id = FLASH_MAN_FUJ;
 384         break;
 385     case (FLASH_WORD_SIZE)SST_MANUFACT:
 386         info->flash_id = FLASH_MAN_SST;
 387         break;
 388     default:
 389         info->flash_id = FLASH_UNKNOWN;
 390         info->sector_count = 0;
 391         info->size = 0;
 392         return (0);         /* no or unknown flash  */
 393     }
 394     printf("recognised manufacturer");
 395
 396     value = addr2[ADDR3];          /* device ID        */
 397         debug ("\ndev_code=%x\n", value);
 398
 399     switch (value) {
 400     case (FLASH_WORD_SIZE)AMD_ID_LV400T:
 401         info->flash_id += FLASH_AM400T;
 402         info->sector_count = 11;
 403         info->size = 0x00080000;
 404         break;              /* => 0.5 MB        */
 405
 406     case (FLASH_WORD_SIZE)AMD_ID_LV400B:
 407         info->flash_id += FLASH_AM400B;
 408         info->sector_count = 11;
 409         info->size = 0x00080000;
 410         break;              /* => 0.5 MB        */
 411
 412     case (FLASH_WORD_SIZE)AMD_ID_LV800T:
 413         info->flash_id += FLASH_AM800T;
 414         info->sector_count = 19;
 415         info->size = 0x00100000;
 416         break;              /* => 1 MB      */
 417
 418     case (FLASH_WORD_SIZE)AMD_ID_LV800B:
 419         info->flash_id += FLASH_AM800B;
 420         info->sector_count = 19;
 421         info->size = 0x00100000;
 422         break;              /* => 1 MB      */
 423
 424     case (FLASH_WORD_SIZE)AMD_ID_LV160T:
 425         info->flash_id += FLASH_AM160T;
 426         info->sector_count = 35;
 427         info->size = 0x00200000;
 428         break;              /* => 2 MB      */
 429
 430     case (FLASH_WORD_SIZE)AMD_ID_LV160B:
 431         info->flash_id += FLASH_AM160B;
 432         info->sector_count = 35;
 433         info->size = 0x00200000;
 434         break;              /* => 2 MB      */
 435
 436     case (FLASH_WORD_SIZE)SST_ID_xF800A:
 437         info->flash_id += FLASH_SST800A;
 438         info->sector_count = 16;
 439         info->size = 0x00100000;
 440         break;              /* => 1 MB      */
 441
 442     case (FLASH_WORD_SIZE)SST_ID_xF160A:
 443         info->flash_id += FLASH_SST160A;
 444         info->sector_count = 32;
 445         info->size = 0x00200000;
 446         break;              /* => 2 MB      */
 447
 448     case (FLASH_WORD_SIZE)AMD_ID_F040B:
 449         info->flash_id += FLASH_AM040;
 450         info->sector_count = 8;
 451         info->size = 0x00080000;
 452         break;              /* => 0.5 MB      */
 453
 454     default:
 455         info->flash_id = FLASH_UNKNOWN;
 456         return (0);         /* => no or unknown flash */
 457
 458     }
 459
 460     printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
 461     /* set up sector start address table */
 462         if (info->flash_id & FLASH_MAN_SST)
 463           {
 464             for (i = 0; i < info->sector_count; i++)
 465               info->start[i] = base + (i * 0x00010000);
 466           }
 467         else
 468     if (info->flash_id & FLASH_BTYPE) {
 469         /* set sector offsets for bottom boot block type    */
 470         info->start[0] = base + 0x00000000;
 471         info->start[1] = base + 0x00004000;
 472         info->start[2] = base + 0x00006000;
 473         info->start[3] = base + 0x00008000;
 474         for (i = 4; i < info->sector_count; i++) {
 475             info->start[i] = base + (i * 0x00010000) - 0x00030000;
 476         }
 477     } else {
 478         /* set sector offsets for top boot block type       */
 479         i = info->sector_count - 1;
 480         info->start[i--] = base + info->size - 0x00004000;
 481         info->start[i--] = base + info->size - 0x00006000;
 482         info->start[i--] = base + info->size - 0x00008000;
 483         for (; i >= 0; i--) {
 484             info->start[i] = base + i * 0x00010000;
 485         }
 486     }
 487
 488     /* check for protected sectors */
 489     for (i = 0; i < info->sector_count; i++) {
 490         /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 491         /* D0 = 1 if protected */
 492         addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 493                 if (info->flash_id & FLASH_MAN_SST)
 494                   info->protect[i] = 0;
 495                 else
 496                   info->protect[i] = addr2[2] & 1;
 497     }
 498
 499     /*
 500      * Prevent writes to uninitialized FLASH.
 501      */
 502     if (info->flash_id != FLASH_UNKNOWN) {
 503        addr2 = (FLASH_WORD_SIZE *)info->start[0];
 504         *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 505     }
 506
 507     return (info->size);
 508 }
 509
 510 #endif
 511
 512
 513 int
 514 flash_erase(flash_info_t *info, int s_first, int s_last)
 515 {
 516     volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 517     int flag, prot, sect, l_sect;
 518     ulong start, now, last;
 519     unsigned char sh8b;
 520
 521     if ((s_first < 0) || (s_first > s_last)) {
 522         if (info->flash_id == FLASH_UNKNOWN) {
 523             printf ("- missing\n");
 524         } else {
 525             printf ("- no sectors to erase\n");
 526         }
 527         return 1;
 528     }
 529
 530     if ((info->flash_id == FLASH_UNKNOWN) ||
 531         (info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
 532         printf ("Can't erase unknown flash type - aborted\n");
 533         return 1;
 534     }
 535
 536     prot = 0;
 537     for (sect=s_first; sect<=s_last; ++sect) {
 538         if (info->protect[sect]) {
 539             prot++;
 540         }
 541     }
 542
 543     if (prot) {
 544         printf ("- Warning: %d protected sectors will not be erased!\n",
 545             prot);
 546     } else {
 547         printf ("\n");
 548     }
 549
 550     l_sect = -1;
 551
 552     /* Check the ROM CS */
 553     if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
 554       sh8b = 3;
 555     else
 556       sh8b = 0;
 557
 558     /* Disable interrupts which might cause a timeout here */
 559     flag = disable_interrupts();
 560
 561     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 562     addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 563     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
 564     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 565     addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 566
 567     /* Start erase on unprotected sectors */
 568     for (sect = s_first; sect<=s_last; sect++) {
 569         if (info->protect[sect] == 0) { /* not protected */
 570             addr = (FLASH_WORD_SIZE *)(info->start[0] + (
 571                                 (info->start[sect] - info->start[0]) << sh8b));
 572                         if (info->flash_id & FLASH_MAN_SST)
 573                           {
 574                             addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 575                             addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 576                             addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
 577                             addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 578                             addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 579                             addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 580                             udelay(30000);  /* wait 30 ms */
 581                           }
 582                         else
 583                           addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 584             l_sect = sect;
 585         }
 586     }
 587
 588     /* re-enable interrupts if necessary */
 589     if (flag)
 590         enable_interrupts();
 591
 592     /* wait at least 80us - let's wait 1 ms */
 593     udelay (1000);
 594
 595     /*
 596      * We wait for the last triggered sector
 597      */
 598     if (l_sect < 0)
 599         goto DONE;
 600
 601     start = get_timer (0);
 602     last  = start;
 603     addr = (FLASH_WORD_SIZE *)(info->start[0] + (
 604                         (info->start[l_sect] - info->start[0]) << sh8b));
 605     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 606         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 607             printf ("Timeout\n");
 608             return 1;
 609         }
 610         /* show that we're waiting */
 611         if ((now - last) > 1000) {  /* every second */
 612             serial_putc ('.');
 613             last = now;
 614         }
 615     }
 616
 617 DONE:
 618     /* reset to read mode */
 619     addr = (FLASH_WORD_SIZE *)info->start[0];
 620     addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
 621
 622     printf (" done\n");
 623     return 0;
 624 }
 625
 626 /*-----------------------------------------------------------------------
 627  * Copy memory to flash, returns:
 628  * 0 - OK
 629  * 1 - write timeout
 630  * 2 - Flash not erased
 631  */
 632
 633 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 634 {
 635     ulong cp, wp, data;
 636     int i, l, rc;
 637
 638     wp = (addr & ~3);   /* get lower word aligned address */
 639
 640     /*
 641      * handle unaligned start bytes
 642      */
 643     if ((l = addr - wp) != 0) {
 644         data = 0;
 645         for (i=0, cp=wp; i<l; ++i, ++cp) {
 646             data = (data << 8) | (*(uchar *)cp);
 647         }
 648         for (; i<4 && cnt>0; ++i) {
 649             data = (data << 8) | *src++;
 650             --cnt;
 651             ++cp;
 652         }
 653         for (; cnt==0 && i<4; ++i, ++cp) {
 654             data = (data << 8) | (*(uchar *)cp);
 655         }
 656
 657         if ((rc = write_word(info, wp, data)) != 0) {
 658             return (rc);
 659         }
 660         wp += 4;
 661     }
 662
 663     /*
 664      * handle word aligned part
 665      */
 666     while (cnt >= 4) {
 667         data = 0;
 668         for (i=0; i<4; ++i) {
 669             data = (data << 8) | *src++;
 670         }
 671         if ((rc = write_word(info, wp, data)) != 0) {
 672             return (rc);
 673         }
 674         wp  += 4;
 675         cnt -= 4;
 676     }
 677
 678     if (cnt == 0) {
 679         return (0);
 680     }
 681
 682     /*
 683      * handle unaligned tail bytes
 684      */
 685     data = 0;
 686     for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 687         data = (data << 8) | *src++;
 688         --cnt;
 689     }
 690     for (; i<4; ++i, ++cp) {
 691         data = (data << 8) | (*(uchar *)cp);
 692     }
 693
 694     return (write_word(info, wp, data));
 695 }
 696
 697 /*-----------------------------------------------------------------------
 698  * Write a word to Flash, returns:
 699  * 0 - OK
 700  * 1 - write timeout
 701  * 2 - Flash not erased
 702  */
 703 static int write_word (flash_info_t *info, ulong dest, ulong data)
 704 {
 705         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)info->start[0];
 706         volatile FLASH_WORD_SIZE *dest2;
 707         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
 708     ulong start;
 709     int flag;
 710         int i;
 711     unsigned char sh8b;
 712
 713     /* Check the ROM CS */
 714     if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
 715       sh8b = 3;
 716     else
 717       sh8b = 0;
 718
 719     dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
 720                                 info->start[0]);
 721
 722     /* Check if Flash is (sufficiently) erased */
 723     if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
 724         return (2);
 725     }
 726     /* Disable interrupts which might cause a timeout here */
 727     flag = disable_interrupts();
 728
 729         for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
 730           {
 731             addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 732             addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 733             addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;
 734
 735             dest2[i << sh8b] = data2[i];
 736
 737             /* re-enable interrupts if necessary */
 738             if (flag)
 739               enable_interrupts();
 740
 741             /* data polling for D7 */
 742             start = get_timer (0);
 743             while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
 744                    (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
 745               if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 746                 return (1);
 747               }
 748             }
 749           }
 750
 751     return (0);
 752 }
 753
 754 /*-----------------------------------------------------------------------
 755  */