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[CONFIG_SYS_MAX_FLASH_BANKS];    /* info for FLASH chips    */
  33
  34 #if defined(CONFIG_ENV_IS_IN_FLASH)
  35 # ifndef  CONFIG_ENV_ADDR
  36 #  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  37 # endif
  38 # ifndef  CONFIG_ENV_SIZE
  39 #  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
  40 # endif
  41 # ifndef  CONFIG_ENV_SECT_SIZE
  42 #  define CONFIG_ENV_SECT_SIZE  CONFIG_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
  51 #if 0
  52 static void flash_get_offsets (ulong base, flash_info_t * info);
  53 #endif /* 0 */
  54
  55 /*flash command address offsets*/
  56
  57 #if 0
  58 #define ADDR0           (0x555)
  59 #define ADDR1           (0x2AA)
  60 #define ADDR3           (0x001)
  61 #else
  62 #define ADDR0           (0xAAA)
  63 #define ADDR1           (0x555)
  64 #define ADDR3           (0x001)
  65 #endif
  66
  67 #define FLASH_WORD_SIZE unsigned char
  68
  69 /*-----------------------------------------------------------------------
  70  */
  71
  72 #if 0
  73 static int byte_parity_odd (unsigned char x) __attribute__ ((const));
  74 #endif /* 0 */
  75 static unsigned long flash_id (unsigned char mfct, unsigned char chip)
  76         __attribute__ ((const));
  77
  78 typedef struct {
  79         FLASH_WORD_SIZE extval;
  80         unsigned short intval;
  81 } map_entry;
  82
  83 #if 0
  84 static int 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 flash_id (unsigned char mfct, unsigned char chip)
  95 {
  96         static const map_entry mfct_map[] = {
  97                 {(FLASH_WORD_SIZE) AMD_MANUFACT,
  98                  (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
  99                 {(FLASH_WORD_SIZE) FUJ_MANUFACT,
 100                  (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
 101                 {(FLASH_WORD_SIZE) STM_MANUFACT,
 102                  (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
 103                 {(FLASH_WORD_SIZE) MT_MANUFACT,
 104                  (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
 105                 {(FLASH_WORD_SIZE) INTEL_MANUFACT,
 106                  (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
 107                 {(FLASH_WORD_SIZE) INTEL_ALT_MANU,
 108                  (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
 109         };
 110
 111         static const map_entry chip_map[] = {
 112                 {AMD_ID_F040B, FLASH_AM040},
 113                 {(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
 114         };
 115
 116         const map_entry *p;
 117         unsigned long result = FLASH_UNKNOWN;
 118
 119         /* find chip id */
 120         for (p = &chip_map[0];
 121              p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
 122                 if (p->extval == chip) {
 123                         result = FLASH_VENDMASK | p->intval;
 124                         break;
 125                 }
 126
 127         /* find vendor id */
 128         for (p = &mfct_map[0];
 129              p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
 130                 if (p->extval == mfct) {
 131                         result &= ~FLASH_VENDMASK;
 132                         result |= (unsigned long) p->intval << 16;
 133                         break;
 134                 }
 135
 136         return result;
 137 }
 138
 139
 140 unsigned long flash_init (void)
 141 {
 142         unsigned long i;
 143         unsigned char j;
 144         static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;
 145
 146         /* Init: no FLASHes known */
 147         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 148                 flash_info_t *const pflinfo = &flash_info[i];
 149
 150                 pflinfo->flash_id = FLASH_UNKNOWN;
 151                 pflinfo->size = 0;
 152                 pflinfo->sector_count = 0;
 153         }
 154
 155         for (i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++) {
 156                 flash_info_t *const pflinfo = &flash_info[i];
 157                 const unsigned long base_address = flash_banks[i];
 158                 volatile FLASH_WORD_SIZE *const flash =
 159                         (FLASH_WORD_SIZE *) base_address;
 160 #if 0
 161                 volatile FLASH_WORD_SIZE *addr2;
 162 #endif
 163 #if 0
 164                 /* write autoselect sequence */
 165                 flash[0x5555] = 0xaa;
 166                 flash[0x2aaa] = 0x55;
 167                 flash[0x5555] = 0x90;
 168 #else
 169                 flash[0xAAA << (3 * i)] = 0xaa;
 170                 flash[0x555 << (3 * i)] = 0x55;
 171                 flash[0xAAA << (3 * i)] = 0x90;
 172 #endif
 173                 __asm__ __volatile__ ("sync");
 174
 175 #if 0
 176                 pflinfo->flash_id = flash_id (flash[0x0], flash[0x1]);
 177 #else
 178                 pflinfo->flash_id =
 179                         flash_id (flash[0x0], flash[0x2 + 14 * i]);
 180 #endif
 181
 182                 switch (pflinfo->flash_id & FLASH_TYPEMASK) {
 183                 case FLASH_AM040:
 184                         pflinfo->size = 0x00080000;
 185                         pflinfo->sector_count = 8;
 186                         for (j = 0; j < 8; j++) {
 187                                 pflinfo->start[j] =
 188                                         base_address + 0x00010000 * j;
 189                                 pflinfo->protect[j] = flash[(j << 16) | 0x2];
 190                         }
 191                         break;
 192                 case FLASH_STM800AB:
 193                         pflinfo->size = 0x00100000;
 194                         pflinfo->sector_count = 19;
 195                         pflinfo->start[0] = base_address;
 196                         pflinfo->start[1] = base_address + 0x4000;
 197                         pflinfo->start[2] = base_address + 0x6000;
 198                         pflinfo->start[3] = base_address + 0x8000;
 199                         for (j = 1; j < 16; j++) {
 200                                 pflinfo->start[j + 3] =
 201                                         base_address + 0x00010000 * j;
 202                         }
 203 #if 0
 204                         /* check for protected sectors */
 205                         for (j = 0; j < pflinfo->sector_count; j++) {
 206                                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 207                                 /* D0 = 1 if protected */
 208                                 addr2 = (volatile FLASH_WORD_SIZE
 209                                          *) (pflinfo->start[j]);
 210                                 if (pflinfo->flash_id & FLASH_MAN_SST)
 211                                         pflinfo->protect[j] = 0;
 212                                 else
 213                                         pflinfo->protect[j] = addr2[2] & 1;
 214                         }
 215 #endif
 216                         break;
 217                 }
 218                 /* Protect monitor and environment sectors
 219                  */
 220 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 221                 flash_protect (FLAG_PROTECT_SET,
 222                                CONFIG_SYS_MONITOR_BASE,
 223                                CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 224                                &flash_info[0]);
 225 #endif
 226
 227 #if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
 228                 flash_protect (FLAG_PROTECT_SET,
 229                                CONFIG_ENV_ADDR,
 230                                CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 231                                &flash_info[0]);
 232 #endif
 233
 234                 /* reset device to read mode */
 235                 flash[0x0000] = 0xf0;
 236                 __asm__ __volatile__ ("sync");
 237         }
 238
 239         return flash_info[0].size + flash_info[1].size;
 240 }
 241
 242 #if 0
 243 static void flash_get_offsets (ulong base, flash_info_t * info)
 244 {
 245         int i;
 246
 247         /* set up sector start address table */
 248         if (info->flash_id & FLASH_MAN_SST) {
 249                 for (i = 0; i < info->sector_count; i++)
 250                         info->start[i] = base + (i * 0x00010000);
 251         } else if (info->flash_id & FLASH_BTYPE) {
 252                 /* set sector offsets for bottom boot block type    */
 253                 info->start[0] = base + 0x00000000;
 254                 info->start[1] = base + 0x00004000;
 255                 info->start[2] = base + 0x00006000;
 256                 info->start[3] = base + 0x00008000;
 257                 for (i = 4; i < info->sector_count; i++) {
 258                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 259                 }
 260         } else {
 261                 /* set sector offsets for top boot block type       */
 262                 i = info->sector_count - 1;
 263                 info->start[i--] = base + info->size - 0x00004000;
 264                 info->start[i--] = base + info->size - 0x00006000;
 265                 info->start[i--] = base + info->size - 0x00008000;
 266                 for (; i >= 0; i--) {
 267                         info->start[i] = base + i * 0x00010000;
 268                 }
 269         }
 270
 271 }
 272 #endif /* 0 */
 273
 274 /*-----------------------------------------------------------------------
 275  */
 276 void flash_print_info (flash_info_t * info)
 277 {
 278         static const char unk[] = "Unknown";
 279         const char *mfct = unk, *type = unk;
 280         unsigned int i;
 281
 282         if (info->flash_id != FLASH_UNKNOWN) {
 283                 switch (info->flash_id & FLASH_VENDMASK) {
 284                 case FLASH_MAN_AMD:
 285                         mfct = "AMD";
 286                         break;
 287                 case FLASH_MAN_FUJ:
 288                         mfct = "FUJITSU";
 289                         break;
 290                 case FLASH_MAN_STM:
 291                         mfct = "STM";
 292                         break;
 293                 case FLASH_MAN_SST:
 294                         mfct = "SST";
 295                         break;
 296                 case FLASH_MAN_BM:
 297                         mfct = "Bright Microelectonics";
 298                         break;
 299                 case FLASH_MAN_INTEL:
 300                         mfct = "Intel";
 301                         break;
 302                 }
 303
 304                 switch (info->flash_id & FLASH_TYPEMASK) {
 305                 case FLASH_AM040:
 306                         type = "AM29F040B (512K * 8, uniform sector size)";
 307                         break;
 308                 case FLASH_AM400B:
 309                         type = "AM29LV400B (4 Mbit, bottom boot sect)";
 310                         break;
 311                 case FLASH_AM400T:
 312                         type = "AM29LV400T (4 Mbit, top boot sector)";
 313                         break;
 314                 case FLASH_AM800B:
 315                         type = "AM29LV800B (8 Mbit, bottom boot sect)";
 316                         break;
 317                 case FLASH_AM800T:
 318                         type = "AM29LV800T (8 Mbit, top boot sector)";
 319                         break;
 320                 case FLASH_AM160T:
 321                         type = "AM29LV160T (16 Mbit, top boot sector)";
 322                         break;
 323                 case FLASH_AM320B:
 324                         type = "AM29LV320B (32 Mbit, bottom boot sect)";
 325                         break;
 326                 case FLASH_AM320T:
 327                         type = "AM29LV320T (32 Mbit, top boot sector)";
 328                         break;
 329                 case FLASH_STM800AB:
 330                         type = "M29W800AB (8 Mbit, bottom boot sect)";
 331                         break;
 332                 case FLASH_SST800A:
 333                         type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
 334                         break;
 335                 case FLASH_SST160A:
 336                         type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
 337                         break;
 338                 }
 339         }
 340
 341         printf ("\n  Brand: %s Type: %s\n"
 342                 "  Size: %lu KB in %d Sectors\n",
 343                 mfct, type, info->size >> 10, info->sector_count);
 344
 345         printf ("  Sector Start Addresses:");
 346
 347         for (i = 0; i < info->sector_count; i++) {
 348                 unsigned long size;
 349                 unsigned int erased;
 350                 unsigned long *flash = (unsigned long *) info->start[i];
 351
 352                 /*
 353                  * Check if whole sector is erased
 354                  */
 355                 size = (i != (info->sector_count - 1)) ?
 356                         (info->start[i + 1] - info->start[i]) >> 2 :
 357                         (info->start[0] + info->size - info->start[i]) >> 2;
 358
 359                 for (flash = (unsigned long *) info->start[i], erased = 1;
 360                      (flash != (unsigned long *) info->start[i] + size)
 361                      && erased; flash++)
 362                         erased = *flash == ~0x0UL;
 363
 364                 printf ("%s %08lX %s %s",
 365                         (i % 5) ? "" : "\n   ",
 366                         info->start[i],
 367                         erased ? "E" : " ", info->protect[i] ? "RO" : "  ");
 368         }
 369
 370         puts ("\n");
 371         return;
 372 }
 373
 374 #if 0
 375
 376 /*
 377  * The following code cannot be run from FLASH!
 378  */
 379 ulong flash_get_size (vu_long * addr, flash_info_t * info)
 380 {
 381         short i;
 382         FLASH_WORD_SIZE value;
 383         ulong base = (ulong) addr;
 384         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;
 385
 386         printf ("flash_get_size: \n");
 387         /* Write auto select command: read Manufacturer ID */
 388         eieio ();
 389         addr2[ADDR0] = (FLASH_WORD_SIZE) 0xAA;
 390         addr2[ADDR1] = (FLASH_WORD_SIZE) 0x55;
 391         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x90;
 392         value = addr2[0];
 393
 394         switch (value) {
 395         case (FLASH_WORD_SIZE) AMD_MANUFACT:
 396                 info->flash_id = FLASH_MAN_AMD;
 397                 break;
 398         case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 399                 info->flash_id = FLASH_MAN_FUJ;
 400                 break;
 401         case (FLASH_WORD_SIZE) SST_MANUFACT:
 402                 info->flash_id = FLASH_MAN_SST;
 403                 break;
 404         default:
 405                 info->flash_id = FLASH_UNKNOWN;
 406                 info->sector_count = 0;
 407                 info->size = 0;
 408                 return (0);     /* no or unknown flash  */
 409         }
 410         printf ("recognised manufacturer");
 411
 412         value = addr2[ADDR3];   /* device ID        */
 413         debug ("\ndev_code=%x\n", value);
 414
 415         switch (value) {
 416         case (FLASH_WORD_SIZE) AMD_ID_LV400T:
 417                 info->flash_id += FLASH_AM400T;
 418                 info->sector_count = 11;
 419                 info->size = 0x00080000;
 420                 break;          /* => 0.5 MB        */
 421
 422         case (FLASH_WORD_SIZE) AMD_ID_LV400B:
 423                 info->flash_id += FLASH_AM400B;
 424                 info->sector_count = 11;
 425                 info->size = 0x00080000;
 426                 break;          /* => 0.5 MB        */
 427
 428         case (FLASH_WORD_SIZE) AMD_ID_LV800T:
 429                 info->flash_id += FLASH_AM800T;
 430                 info->sector_count = 19;
 431                 info->size = 0x00100000;
 432                 break;          /* => 1 MB      */
 433
 434         case (FLASH_WORD_SIZE) AMD_ID_LV800B:
 435                 info->flash_id += FLASH_AM800B;
 436                 info->sector_count = 19;
 437                 info->size = 0x00100000;
 438                 break;          /* => 1 MB      */
 439
 440         case (FLASH_WORD_SIZE) AMD_ID_LV160T:
 441                 info->flash_id += FLASH_AM160T;
 442                 info->sector_count = 35;
 443                 info->size = 0x00200000;
 444                 break;          /* => 2 MB      */
 445
 446         case (FLASH_WORD_SIZE) AMD_ID_LV160B:
 447                 info->flash_id += FLASH_AM160B;
 448                 info->sector_count = 35;
 449                 info->size = 0x00200000;
 450                 break;          /* => 2 MB      */
 451
 452         case (FLASH_WORD_SIZE) SST_ID_xF800A:
 453                 info->flash_id += FLASH_SST800A;
 454                 info->sector_count = 16;
 455                 info->size = 0x00100000;
 456                 break;          /* => 1 MB      */
 457
 458         case (FLASH_WORD_SIZE) SST_ID_xF160A:
 459                 info->flash_id += FLASH_SST160A;
 460                 info->sector_count = 32;
 461                 info->size = 0x00200000;
 462                 break;          /* => 2 MB      */
 463
 464         case (FLASH_WORD_SIZE) AMD_ID_F040B:
 465                 info->flash_id += FLASH_AM040;
 466                 info->sector_count = 8;
 467                 info->size = 0x00080000;
 468                 break;          /* => 0.5 MB      */
 469
 470         default:
 471                 info->flash_id = FLASH_UNKNOWN;
 472                 return (0);     /* => no or unknown flash */
 473
 474         }
 475
 476         printf ("flash id %lx; sector count %x, size %lx\n", info->flash_id,
 477                 info->sector_count, info->size);
 478         /* set up sector start address table */
 479         if (info->flash_id & FLASH_MAN_SST) {
 480                 for (i = 0; i < info->sector_count; i++)
 481                         info->start[i] = base + (i * 0x00010000);
 482         } else if (info->flash_id & FLASH_BTYPE) {
 483                 /* set sector offsets for bottom boot block type    */
 484                 info->start[0] = base + 0x00000000;
 485                 info->start[1] = base + 0x00004000;
 486                 info->start[2] = base + 0x00006000;
 487                 info->start[3] = base + 0x00008000;
 488                 for (i = 4; i < info->sector_count; i++) {
 489                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 490                 }
 491         } else {
 492                 /* set sector offsets for top boot block type       */
 493                 i = info->sector_count - 1;
 494                 info->start[i--] = base + info->size - 0x00004000;
 495                 info->start[i--] = base + info->size - 0x00006000;
 496                 info->start[i--] = base + info->size - 0x00008000;
 497                 for (; i >= 0; i--) {
 498                         info->start[i] = base + i * 0x00010000;
 499                 }
 500         }
 501
 502         /* check for protected sectors */
 503         for (i = 0; i < info->sector_count; i++) {
 504                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 505                 /* D0 = 1 if protected */
 506                 addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 507                 if (info->flash_id & FLASH_MAN_SST)
 508                         info->protect[i] = 0;
 509                 else
 510                         info->protect[i] = addr2[2] & 1;
 511         }
 512
 513         /*
 514          * Prevent writes to uninitialized FLASH.
 515          */
 516         if (info->flash_id != FLASH_UNKNOWN) {
 517                 addr2 = (FLASH_WORD_SIZE *) info->start[0];
 518                 *addr2 = (FLASH_WORD_SIZE) 0x00F000F0;  /* reset bank */
 519         }
 520
 521         return (info->size);
 522 }
 523
 524 #endif
 525
 526
 527 int flash_erase (flash_info_t * info, int s_first, int s_last)
 528 {
 529         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 530         int flag, prot, sect, l_sect;
 531         ulong start, now, last;
 532         unsigned char sh8b;
 533
 534         if ((s_first < 0) || (s_first > s_last)) {
 535                 if (info->flash_id == FLASH_UNKNOWN) {
 536                         printf ("- missing\n");
 537                 } else {
 538                         printf ("- no sectors to erase\n");
 539                 }
 540                 return 1;
 541         }
 542
 543         if ((info->flash_id == FLASH_UNKNOWN) ||
 544             (info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
 545                 printf ("Can't erase unknown flash type - aborted\n");
 546                 return 1;
 547         }
 548
 549         prot = 0;
 550         for (sect = s_first; sect <= s_last; ++sect) {
 551                 if (info->protect[sect]) {
 552                         prot++;
 553                 }
 554         }
 555
 556         if (prot) {
 557                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 558         } else {
 559                 printf ("\n");
 560         }
 561
 562         l_sect = -1;
 563
 564         /* Check the ROM CS */
 565         if ((info->start[0] >= ROM_CS1_START)
 566             && (info->start[0] < ROM_CS0_START))
 567                 sh8b = 3;
 568         else
 569                 sh8b = 0;
 570
 571         /* Disable interrupts which might cause a timeout here */
 572         flag = disable_interrupts ();
 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
 580         /* Start erase on unprotected sectors */
 581         for (sect = s_first; sect <= s_last; sect++) {
 582                 if (info->protect[sect] == 0) { /* not protected */
 583                         addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->
 584                                                                        start
 585                                                                        [sect]
 586                                                                        -
 587                                                                        info->
 588                                                                        start
 589                                                                        [0]) <<
 590                                                                       sh8b));
 591                         if (info->flash_id & FLASH_MAN_SST) {
 592                                 addr[ADDR0 << sh8b] =
 593                                         (FLASH_WORD_SIZE) 0x00AA00AA;
 594                                 addr[ADDR1 << sh8b] =
 595                                         (FLASH_WORD_SIZE) 0x00550055;
 596                                 addr[ADDR0 << sh8b] =
 597                                         (FLASH_WORD_SIZE) 0x00800080;
 598                                 addr[ADDR0 << sh8b] =
 599                                         (FLASH_WORD_SIZE) 0x00AA00AA;
 600                                 addr[ADDR1 << sh8b] =
 601                                         (FLASH_WORD_SIZE) 0x00550055;
 602                                 addr[0] = (FLASH_WORD_SIZE) 0x00500050; /* block erase */
 603                                 udelay (30000); /* wait 30 ms */
 604                         } else
 605                                 addr[0] = (FLASH_WORD_SIZE) 0x00300030; /* sector erase */
 606                         l_sect = sect;
 607                 }
 608         }
 609
 610         /* re-enable interrupts if necessary */
 611         if (flag)
 612                 enable_interrupts ();
 613
 614         /* wait at least 80us - let's wait 1 ms */
 615         udelay (1000);
 616
 617         /*
 618          * We wait for the last triggered sector
 619          */
 620         if (l_sect < 0)
 621                 goto DONE;
 622
 623         start = get_timer (0);
 624         last = start;
 625         addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->start[l_sect] -
 626                                                        info->
 627                                                        start[0]) << sh8b));
 628         while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 629                (FLASH_WORD_SIZE) 0x00800080) {
 630                 if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 631                         printf ("Timeout\n");
 632                         return 1;
 633                 }
 634                 /* show that we're waiting */
 635                 if ((now - last) > 1000) {      /* every second */
 636                         serial_putc ('.');
 637                         last = now;
 638                 }
 639         }
 640
 641       DONE:
 642         /* reset to read mode */
 643         addr = (FLASH_WORD_SIZE *) info->start[0];
 644         addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */
 645
 646         printf (" done\n");
 647         return 0;
 648 }
 649
 650 /*-----------------------------------------------------------------------
 651  * Copy memory to flash, returns:
 652  * 0 - OK
 653  * 1 - write timeout
 654  * 2 - Flash not erased
 655  */
 656
 657 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 658 {
 659         ulong cp, wp, data;
 660         int i, l, rc;
 661
 662         wp = (addr & ~3);       /* get lower word aligned address */
 663
 664         /*
 665          * handle unaligned start bytes
 666          */
 667         if ((l = addr - wp) != 0) {
 668                 data = 0;
 669                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 670                         data = (data << 8) | (*(uchar *) cp);
 671                 }
 672                 for (; i < 4 && cnt > 0; ++i) {
 673                         data = (data << 8) | *src++;
 674                         --cnt;
 675                         ++cp;
 676                 }
 677                 for (; cnt == 0 && i < 4; ++i, ++cp) {
 678                         data = (data << 8) | (*(uchar *) cp);
 679                 }
 680
 681                 if ((rc = write_word (info, wp, data)) != 0) {
 682                         return (rc);
 683                 }
 684                 wp += 4;
 685         }
 686
 687         /*
 688          * handle word aligned part
 689          */
 690         while (cnt >= 4) {
 691                 data = 0;
 692                 for (i = 0; i < 4; ++i) {
 693                         data = (data << 8) | *src++;
 694                 }
 695                 if ((rc = write_word (info, wp, data)) != 0) {
 696                         return (rc);
 697                 }
 698                 wp += 4;
 699                 cnt -= 4;
 700         }
 701
 702         if (cnt == 0) {
 703                 return (0);
 704         }
 705
 706         /*
 707          * handle unaligned tail bytes
 708          */
 709         data = 0;
 710         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 711                 data = (data << 8) | *src++;
 712                 --cnt;
 713         }
 714         for (; i < 4; ++i, ++cp) {
 715                 data = (data << 8) | (*(uchar *) cp);
 716         }
 717
 718         return (write_word (info, wp, data));
 719 }
 720
 721 /*-----------------------------------------------------------------------
 722  * Write a word to Flash, returns:
 723  * 0 - OK
 724  * 1 - write timeout
 725  * 2 - Flash not erased
 726  */
 727 static int write_word (flash_info_t * info, ulong dest, ulong data)
 728 {
 729         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) info->start[0];
 730         volatile FLASH_WORD_SIZE *dest2;
 731         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 732         ulong start;
 733         int flag;
 734         int i;
 735         unsigned char sh8b;
 736
 737         /* Check the ROM CS */
 738         if ((info->start[0] >= ROM_CS1_START)
 739             && (info->start[0] < ROM_CS0_START))
 740                 sh8b = 3;
 741         else
 742                 sh8b = 0;
 743
 744         dest2 = (FLASH_WORD_SIZE *) (((dest - info->start[0]) << sh8b) +
 745                                      info->start[0]);
 746
 747         /* Check if Flash is (sufficiently) erased */
 748         if ((*dest2 & (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 749                 return (2);
 750         }
 751         /* Disable interrupts which might cause a timeout here */
 752         flag = disable_interrupts ();
 753
 754         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 755                 addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
 756                 addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
 757                 addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00A000A0;
 758
 759                 dest2[i << sh8b] = data2[i];
 760
 761                 /* re-enable interrupts if necessary */
 762                 if (flag)
 763                         enable_interrupts ();
 764
 765                 /* data polling for D7 */
 766                 start = get_timer (0);
 767                 while ((dest2[i << sh8b] & (FLASH_WORD_SIZE) 0x00800080) !=
 768                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 769                         if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 770                                 return (1);
 771                         }
 772                 }
 773         }
 774
 775         return (0);
 776 }
 777
 778 /*-----------------------------------------------------------------------
 779  */