board/esd/cpci5200/strataflash.c

   1 /*
   2  * (C) Copyright 2002
   3  * Brad Kemp, Seranoa Networks, Brad.Kemp@seranoa.com
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/processor.h>
  10 #include <asm/cache.h>
  11
  12 #undef  DEBUG_FLASH
  13 /*
  14  * This file implements a Common Flash Interface (CFI) driver for U-Boot.
  15  * The width of the port and the width of the chips are determined at initialization.
  16  * These widths are used to calculate the address for access CFI data structures.
  17  * It has been tested on an Intel Strataflash implementation.
  18  *
  19  * References
  20  * JEDEC Standard JESD68 - Common Flash Interface (CFI)
  21  * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
  22  * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
  23  * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
  24  *
  25  * TODO
  26  * Use Primary Extended Query table (PRI) and Alternate Algorithm Query Table (ALT) to determine if protection is available
  27  * Add support for other command sets Use the PRI and ALT to determine command set
  28  * Verify erase and program timeouts.
  29  */
  30
  31 #define FLASH_CMD_CFI                   0x98
  32 #define FLASH_CMD_READ_ID               0x90
  33 #define FLASH_CMD_RESET                 0xff
  34 #define FLASH_CMD_BLOCK_ERASE           0x20
  35 #define FLASH_CMD_ERASE_CONFIRM         0xD0
  36 #define FLASH_CMD_WRITE                 0x40
  37 #define FLASH_CMD_PROTECT               0x60
  38 #define FLASH_CMD_PROTECT_SET           0x01
  39 #define FLASH_CMD_PROTECT_CLEAR         0xD0
  40 #define FLASH_CMD_CLEAR_STATUS          0x50
  41 #define FLASH_CMD_WRITE_TO_BUFFER       0xE8
  42 #define FLASH_CMD_WRITE_BUFFER_CONFIRM  0xD0
  43
  44 #define FLASH_STATUS_DONE               0x80
  45 #define FLASH_STATUS_ESS                0x40
  46 #define FLASH_STATUS_ECLBS              0x20
  47 #define FLASH_STATUS_PSLBS              0x10
  48 #define FLASH_STATUS_VPENS              0x08
  49 #define FLASH_STATUS_PSS                0x04
  50 #define FLASH_STATUS_DPS                0x02
  51 #define FLASH_STATUS_R                  0x01
  52 #define FLASH_STATUS_PROTECT            0x01
  53
  54 #define FLASH_OFFSET_CFI                0x55
  55 #define FLASH_OFFSET_CFI_RESP           0x10
  56 #define FLASH_OFFSET_WTOUT              0x1F
  57 #define FLASH_OFFSET_WBTOUT             0x20
  58 #define FLASH_OFFSET_ETOUT              0x21
  59 #define FLASH_OFFSET_CETOUT             0x22
  60 #define FLASH_OFFSET_WMAX_TOUT          0x23
  61 #define FLASH_OFFSET_WBMAX_TOUT         0x24
  62 #define FLASH_OFFSET_EMAX_TOUT          0x25
  63 #define FLASH_OFFSET_CEMAX_TOUT         0x26
  64 #define FLASH_OFFSET_SIZE               0x27
  65 #define FLASH_OFFSET_INTERFACE          0x28
  66 #define FLASH_OFFSET_BUFFER_SIZE        0x2A
  67 #define FLASH_OFFSET_NUM_ERASE_REGIONS  0x2C
  68 #define FLASH_OFFSET_ERASE_REGIONS      0x2D
  69 #define FLASH_OFFSET_PROTECT            0x02
  70 #define FLASH_OFFSET_USER_PROTECTION    0x85
  71 #define FLASH_OFFSET_INTEL_PROTECTION   0x81
  72
  73 #define FLASH_MAN_CFI                   0x01000000
  74
  75 typedef union {
  76         unsigned char c;
  77         unsigned short w;
  78         unsigned long l;
  79 } cfiword_t;
  80
  81 typedef union {
  82         unsigned char *cp;
  83         unsigned short *wp;
  84         unsigned long *lp;
  85 } cfiptr_t;
  86
  87 #define NUM_ERASE_REGIONS 4
  88
  89 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];    /* info for FLASH chips        */
  90
  91 /*-----------------------------------------------------------------------
  92  * Functions
  93  */
  94
  95 static void flash_add_byte(flash_info_t * info, cfiword_t * cword, uchar c);
  96 static void flash_make_cmd(flash_info_t * info, uchar cmd, void *cmdbuf);
  97 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset,
  98                             uchar cmd);
  99 static int flash_isequal(flash_info_t * info, int sect, uchar offset,
 100                          uchar cmd);
 101 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 102 static int flash_detect_cfi(flash_info_t * info);
 103 static ulong flash_get_size(ulong base, int banknum);
 104 static int flash_write_cfiword(flash_info_t * info, ulong dest,
 105                                cfiword_t cword);
 106 static int flash_full_status_check(flash_info_t * info, ulong sector,
 107                                    ulong tout, char *prompt);
 108 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 109 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp,
 110                                  int len);
 111 #endif
 112 /*-----------------------------------------------------------------------
 113  * create an address based on the offset and the port width
 114  */
 115 inline uchar *flash_make_addr(flash_info_t * info, int sect, int offset)
 116 {
 117         return ((uchar *) (info->start[sect] + (offset * info->portwidth)));
 118 }
 119
 120 /*-----------------------------------------------------------------------
 121  * read a character at a port width address
 122  */
 123 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 124 {
 125         uchar *cp;
 126         cp = flash_make_addr(info, 0, offset);
 127         return (cp[info->portwidth - 1]);
 128 }
 129
 130 /*-----------------------------------------------------------------------
 131  * read a short word by swapping for ppc format.
 132  */
 133 ushort flash_read_ushort(flash_info_t * info, int sect, uchar offset)
 134 {
 135         uchar *addr;
 136
 137         addr = flash_make_addr(info, sect, offset);
 138         return ((addr[(2 * info->portwidth) - 1] << 8) |
 139                 addr[info->portwidth - 1]);
 140
 141 }
 142
 143 /*-----------------------------------------------------------------------
 144  * read a long word by picking the least significant byte of each maiximum
 145  * port size word. Swap for ppc format.
 146  */
 147 ulong flash_read_long(flash_info_t * info, int sect, uchar offset)
 148 {
 149         uchar *addr;
 150
 151         addr = flash_make_addr(info, sect, offset);
 152         return ((addr[(2 * info->portwidth) - 1] << 24) |
 153                 (addr[(info->portwidth) - 1] << 16) |
 154                 (addr[(4 * info->portwidth) - 1] << 8) |
 155                 addr[(3 * info->portwidth) - 1]);
 156
 157 }
 158
 159 /*-----------------------------------------------------------------------
 160  */
 161 unsigned long flash_init(void)
 162 {
 163         unsigned long size;
 164         int i;
 165         unsigned long address;
 166
 167         /* The flash is positioned back to back, with the demultiplexing of the chip
 168          * based on the A24 address line.
 169          *
 170          */
 171
 172         address = CONFIG_SYS_FLASH_BASE;
 173         size = 0;
 174
 175         /* Init: no FLASHes known */
 176         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 177                 flash_info[i].flash_id = FLASH_UNKNOWN;
 178                 size += flash_info[i].size = flash_get_size(address, i);
 179                 address += CONFIG_SYS_FLASH_INCREMENT;
 180                 if (flash_info[i].flash_id == FLASH_UNKNOWN) {
 181                         printf
 182                             ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
 183                              i, flash_info[0].size, flash_info[i].size << 20);
 184                 }
 185         }
 186
 187 #if 0                           /* test-only */
 188         /* Monitor protection ON by default */
 189 #if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE)
 190         for (i = 0;
 191              flash_info[0].start[i] < CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1;
 192              i++)
 193                 (void)flash_real_protect(&flash_info[0], i, 1);
 194 #endif
 195 #endif
 196
 197         return (size);
 198 }
 199
 200 /*-----------------------------------------------------------------------
 201  */
 202 int flash_erase(flash_info_t * info, int s_first, int s_last)
 203 {
 204         int rcode = 0;
 205         int prot;
 206         int sect;
 207
 208         if (info->flash_id != FLASH_MAN_CFI) {
 209                 printf("Can't erase unknown flash type - aborted\n");
 210                 return 1;
 211         }
 212         if ((s_first < 0) || (s_first > s_last)) {
 213                 printf("- no sectors to erase\n");
 214                 return 1;
 215         }
 216
 217         prot = 0;
 218         for (sect = s_first; sect <= s_last; ++sect) {
 219                 if (info->protect[sect]) {
 220                         prot++;
 221                 }
 222         }
 223         if (prot) {
 224                 printf("- Warning: %d protected sectors will not be erased!\n",
 225                        prot);
 226         } else {
 227                 printf("\n");
 228         }
 229
 230         for (sect = s_first; sect <= s_last; sect++) {
 231                 if (info->protect[sect] == 0) { /* not protected */
 232                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 233                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 234                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 235
 236                         if (flash_full_status_check
 237                             (info, sect, info->erase_blk_tout, "erase")) {
 238                                 rcode = 1;
 239                         } else
 240                                 printf(".");
 241                 }
 242         }
 243         printf(" done\n");
 244         return rcode;
 245 }
 246
 247 /*-----------------------------------------------------------------------
 248  */
 249 void flash_print_info(flash_info_t * info)
 250 {
 251         int i;
 252
 253         if (info->flash_id != FLASH_MAN_CFI) {
 254                 printf("missing or unknown FLASH type\n");
 255                 return;
 256         }
 257
 258         printf("CFI conformant FLASH (%d x %d)",
 259                (info->portwidth << 3), (info->chipwidth << 3));
 260         printf("  Size: %ld MB in %d Sectors\n",
 261                info->size >> 20, info->sector_count);
 262         printf
 263             (" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 264              info->erase_blk_tout, info->write_tout, info->buffer_write_tout,
 265              info->buffer_size);
 266
 267         printf("  Sector Start Addresses:");
 268         for (i = 0; i < info->sector_count; ++i) {
 269                 if ((i % 5) == 0)
 270                         printf("\n");
 271                 printf(" %08lX%5s",
 272                        info->start[i], info->protect[i] ? " (RO)" : " ");
 273         }
 274         printf("\n");
 275         return;
 276 }
 277
 278 /*-----------------------------------------------------------------------
 279  * Copy memory to flash, returns:
 280  * 0 - OK
 281  * 1 - write timeout
 282  * 2 - Flash not erased
 283  */
 284 int write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 285 {
 286         ulong wp;
 287         ulong cp;
 288         int aln;
 289         cfiword_t cword;
 290         int i, rc;
 291
 292         /* get lower aligned address */
 293         wp = (addr & ~(info->portwidth - 1));
 294
 295         /* handle unaligned start */
 296         if ((aln = addr - wp) != 0) {
 297                 cword.l = 0;
 298                 cp = wp;
 299                 for (i = 0; i < aln; ++i, ++cp)
 300                         flash_add_byte(info, &cword, (*(uchar *) cp));
 301
 302                 for (; (i < info->portwidth) && (cnt > 0); i++) {
 303                         flash_add_byte(info, &cword, *src++);
 304                         cnt--;
 305                         cp++;
 306                 }
 307                 for (; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 308                         flash_add_byte(info, &cword, (*(uchar *) cp));
 309                 if ((rc = flash_write_cfiword(info, wp, cword)) != 0)
 310                         return rc;
 311                 wp = cp;
 312         }
 313 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 314         while (cnt >= info->portwidth) {
 315                 i = info->buffer_size > cnt ? cnt : info->buffer_size;
 316                 if ((rc = flash_write_cfibuffer(info, wp, src, i)) != ERR_OK)
 317                         return rc;
 318                 wp += i;
 319                 src += i;
 320                 cnt -= i;
 321         }
 322 #else
 323         /* handle the aligned part */
 324         while (cnt >= info->portwidth) {
 325                 cword.l = 0;
 326                 for (i = 0; i < info->portwidth; i++) {
 327                         flash_add_byte(info, &cword, *src++);
 328                 }
 329                 if ((rc = flash_write_cfiword(info, wp, cword)) != 0)
 330                         return rc;
 331                 wp += info->portwidth;
 332                 cnt -= info->portwidth;
 333         }
 334 #endif                          /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */
 335         if (cnt == 0) {
 336                 return (0);
 337         }
 338
 339         /*
 340          * handle unaligned tail bytes
 341          */
 342         cword.l = 0;
 343         for (i = 0, cp = wp; (i < info->portwidth) && (cnt > 0); ++i, ++cp) {
 344                 flash_add_byte(info, &cword, *src++);
 345                 --cnt;
 346         }
 347         for (; i < info->portwidth; ++i, ++cp) {
 348                 flash_add_byte(info, &cword, (*(uchar *) cp));
 349         }
 350
 351         return flash_write_cfiword(info, wp, cword);
 352 }
 353
 354 /*-----------------------------------------------------------------------
 355  */
 356 int flash_real_protect(flash_info_t * info, long sector, int prot)
 357 {
 358         int retcode = 0;
 359
 360         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 361         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 362         if (prot)
 363                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 364         else
 365                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 366
 367         if ((retcode =
 368              flash_full_status_check(info, sector, info->erase_blk_tout,
 369                                      prot ? "protect" : "unprotect")) == 0) {
 370
 371                 info->protect[sector] = prot;
 372                 /* Intel's unprotect unprotects all locking */
 373                 if (prot == 0) {
 374                         int i;
 375                         for (i = 0; i < info->sector_count; i++) {
 376                                 if (info->protect[i])
 377                                         flash_real_protect(info, i, 1);
 378                         }
 379                 }
 380         }
 381
 382         return retcode;
 383 }
 384
 385 /*-----------------------------------------------------------------------
 386  *  wait for XSR.7 to be set. Time out with an error if it does not.
 387  *  This routine does not set the flash to read-array mode.
 388  */
 389 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout,
 390                               char *prompt)
 391 {
 392         ulong start;
 393
 394         /* Wait for command completion */
 395         start = get_timer(0);
 396         while (!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 397                 if (get_timer(start) > info->erase_blk_tout) {
 398                         printf("Flash %s timeout at address %lx\n", prompt,
 399                                info->start[sector]);
 400                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 401                         return ERR_TIMOUT;
 402                 }
 403         }
 404         return ERR_OK;
 405 }
 406
 407 /*-----------------------------------------------------------------------
 408  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 409  * This routine sets the flash to read-array mode.
 410  */
 411 static int flash_full_status_check(flash_info_t * info, ulong sector,
 412                                    ulong tout, char *prompt)
 413 {
 414         int retcode;
 415         retcode = flash_status_check(info, sector, tout, prompt);
 416         if ((retcode == ERR_OK)
 417             && !flash_isequal(info, sector, 0, FLASH_STATUS_DONE)) {
 418                 retcode = ERR_INVAL;
 419                 printf("Flash %s error at address %lx\n", prompt,
 420                        info->start[sector]);
 421                 if (flash_isset
 422                     (info, sector, 0,
 423                      FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)) {
 424                         printf("Command Sequence Error.\n");
 425                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)) {
 426                         printf("Block Erase Error.\n");
 427                         retcode = ERR_NOT_ERASED;
 428                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 429                         printf("Locking Error\n");
 430                 }
 431                 if (flash_isset(info, sector, 0, FLASH_STATUS_DPS)) {
 432                         printf("Block locked.\n");
 433                         retcode = ERR_PROTECTED;
 434                 }
 435                 if (flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 436                         printf("Vpp Low Error.\n");
 437         }
 438         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 439         return retcode;
 440 }
 441
 442 /*-----------------------------------------------------------------------
 443  */
 444 static void flash_add_byte(flash_info_t * info, cfiword_t * cword, uchar c)
 445 {
 446         switch (info->portwidth) {
 447         case FLASH_CFI_8BIT:
 448                 cword->c = c;
 449                 break;
 450         case FLASH_CFI_16BIT:
 451                 cword->w = (cword->w << 8) | c;
 452                 break;
 453         case FLASH_CFI_32BIT:
 454                 cword->l = (cword->l << 8) | c;
 455         }
 456 }
 457
 458 /*-----------------------------------------------------------------------
 459  * make a proper sized command based on the port and chip widths
 460  */
 461 static void flash_make_cmd(flash_info_t * info, uchar cmd, void *cmdbuf)
 462 {
 463         int i;
 464         uchar *cp = (uchar *) cmdbuf;
 465         for (i = 0; i < info->portwidth; i++)
 466                 *cp++ = ((i + 1) % info->chipwidth) ? '\0' : cmd;
 467 }
 468
 469 /*
 470  * Write a proper sized command to the correct address
 471  */
 472 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset,
 473                             uchar cmd)
 474 {
 475
 476         volatile cfiptr_t addr;
 477         cfiword_t cword;
 478         addr.cp = flash_make_addr(info, sect, offset);
 479         flash_make_cmd(info, cmd, &cword);
 480         switch (info->portwidth) {
 481         case FLASH_CFI_8BIT:
 482                 *addr.cp = cword.c;
 483                 break;
 484         case FLASH_CFI_16BIT:
 485                 *addr.wp = cword.w;
 486                 break;
 487         case FLASH_CFI_32BIT:
 488                 *addr.lp = cword.l;
 489                 break;
 490         }
 491 }
 492
 493 /*-----------------------------------------------------------------------
 494  */
 495 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 496 {
 497         cfiptr_t cptr;
 498         cfiword_t cword;
 499         int retval;
 500         cptr.cp = flash_make_addr(info, sect, offset);
 501         flash_make_cmd(info, cmd, &cword);
 502         switch (info->portwidth) {
 503         case FLASH_CFI_8BIT:
 504                 retval = (cptr.cp[0] == cword.c);
 505                 break;
 506         case FLASH_CFI_16BIT:
 507                 retval = (cptr.wp[0] == cword.w);
 508                 break;
 509         case FLASH_CFI_32BIT:
 510                 retval = (cptr.lp[0] == cword.l);
 511                 break;
 512         default:
 513                 retval = 0;
 514                 break;
 515         }
 516         return retval;
 517 }
 518
 519 /*-----------------------------------------------------------------------
 520  */
 521 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
 522 {
 523         cfiptr_t cptr;
 524         cfiword_t cword;
 525         int retval;
 526         cptr.cp = flash_make_addr(info, sect, offset);
 527         flash_make_cmd(info, cmd, &cword);
 528         switch (info->portwidth) {
 529         case FLASH_CFI_8BIT:
 530                 retval = ((cptr.cp[0] & cword.c) == cword.c);
 531                 break;
 532         case FLASH_CFI_16BIT:
 533                 retval = ((cptr.wp[0] & cword.w) == cword.w);
 534                 break;
 535         case FLASH_CFI_32BIT:
 536                 retval = ((cptr.lp[0] & cword.l) == cword.l);
 537                 break;
 538         default:
 539                 retval = 0;
 540                 break;
 541         }
 542         return retval;
 543 }
 544
 545 /*-----------------------------------------------------------------------
 546  * detect if flash is compatible with the Common Flash Interface (CFI)
 547  * http://www.jedec.org/download/search/jesd68.pdf
 548  *
 549  */
 550 static int flash_detect_cfi(flash_info_t * info)
 551 {
 552
 553         for (info->portwidth = FLASH_CFI_8BIT;
 554              info->portwidth <= FLASH_CFI_32BIT; info->portwidth <<= 1) {
 555                 for (info->chipwidth = FLASH_CFI_BY8;
 556                      info->chipwidth <= info->portwidth;
 557                      info->chipwidth <<= 1) {
 558                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 559                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI,
 560                                         FLASH_CMD_CFI);
 561                         if (flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP, 'Q')
 562                             && flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1,
 563                                              'R')
 564                             && flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2,
 565                                              'Y'))
 566                                 return 1;
 567                 }
 568         }
 569         return 0;
 570 }
 571
 572 /*
 573  * The following code cannot be run from FLASH!
 574  *
 575  */
 576 static ulong flash_get_size(ulong base, int banknum)
 577 {
 578         flash_info_t *info = &flash_info[banknum];
 579         int i, j;
 580         int sect_cnt;
 581         unsigned long sector;
 582         unsigned long tmp;
 583         int size_ratio = 0;
 584         uchar num_erase_regions;
 585         int erase_region_size;
 586         int erase_region_count;
 587
 588         info->start[0] = base;
 589 #if 0
 590         invalidate_dcache_range(base, base + 0x400);
 591 #endif
 592         if (flash_detect_cfi(info)) {
 593
 594                 size_ratio = info->portwidth / info->chipwidth;
 595                 num_erase_regions =
 596                     flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
 597
 598                 sect_cnt = 0;
 599                 sector = base;
 600                 for (i = 0; i < num_erase_regions; i++) {
 601                         if (i > NUM_ERASE_REGIONS) {
 602                                 printf("%d erase regions found, only %d used\n",
 603                                        num_erase_regions, NUM_ERASE_REGIONS);
 604                                 break;
 605                         }
 606                         tmp =
 607                             flash_read_long(info, 0,
 608                                             FLASH_OFFSET_ERASE_REGIONS);
 609                         erase_region_size =
 610                             (tmp & 0xffff) ? ((tmp & 0xffff) * 256) : 128;
 611                         tmp >>= 16;
 612                         erase_region_count = (tmp & 0xffff) + 1;
 613                         for (j = 0; j < erase_region_count; j++) {
 614                                 info->start[sect_cnt] = sector;
 615                                 sector += (erase_region_size * size_ratio);
 616                                 info->protect[sect_cnt] =
 617                                     flash_isset(info, sect_cnt,
 618                                                 FLASH_OFFSET_PROTECT,
 619                                                 FLASH_STATUS_PROTECT);
 620                                 sect_cnt++;
 621                         }
 622                 }
 623
 624                 info->sector_count = sect_cnt;
 625                 /* multiply the size by the number of chips */
 626                 info->size =
 627                     (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) *
 628                     size_ratio;
 629                 info->buffer_size =
 630                     (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
 631                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
 632                 info->erase_blk_tout =
 633                     (tmp *
 634                      (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
 635                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
 636                 info->buffer_write_tout =
 637                     (tmp *
 638                      (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
 639                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
 640                 info->write_tout =
 641                     (tmp *
 642                      (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT))) /
 643                     1000;
 644                 info->flash_id = FLASH_MAN_CFI;
 645         }
 646
 647         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 648 #ifdef DEBUG_FLASH
 649         printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth);        /* test-only */
 650 #endif
 651 #ifdef DEBUG_FLASH
 652         printf("found %d erase regions\n", num_erase_regions);
 653 #endif
 654 #ifdef DEBUG_FLASH
 655         printf("size=%08x sectors=%08x \n", info->size, info->sector_count);
 656 #endif
 657         return (info->size);
 658 }
 659
 660 /*-----------------------------------------------------------------------
 661  */
 662 static int flash_write_cfiword(flash_info_t * info, ulong dest, cfiword_t cword)
 663 {
 664
 665         cfiptr_t cptr;
 666         int flag;
 667
 668         cptr.cp = (uchar *)dest;
 669
 670         /* Check if Flash is (sufficiently) erased */
 671         switch (info->portwidth) {
 672         case FLASH_CFI_8BIT:
 673                 flag = ((cptr.cp[0] & cword.c) == cword.c);
 674                 break;
 675         case FLASH_CFI_16BIT:
 676                 flag = ((cptr.wp[0] & cword.w) == cword.w);
 677                 break;
 678         case FLASH_CFI_32BIT:
 679                 flag = ((cptr.lp[0] & cword.l) == cword.l);
 680                 break;
 681         default:
 682                 return 2;
 683         }
 684         if (!flag)
 685                 return 2;
 686
 687         /* Disable interrupts which might cause a timeout here */
 688         flag = disable_interrupts();
 689
 690         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
 691         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
 692
 693         switch (info->portwidth) {
 694         case FLASH_CFI_8BIT:
 695                 cptr.cp[0] = cword.c;
 696                 break;
 697         case FLASH_CFI_16BIT:
 698                 cptr.wp[0] = cword.w;
 699                 break;
 700         case FLASH_CFI_32BIT:
 701                 cptr.lp[0] = cword.l;
 702                 break;
 703         }
 704
 705         /* re-enable interrupts if necessary */
 706         if (flag)
 707                 enable_interrupts();
 708
 709         return flash_full_status_check(info, 0, info->write_tout, "write");
 710 }
 711
 712 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 713
 714 /* loop through the sectors from the highest address
 715  * when the passed address is greater or equal to the sector address
 716  * we have a match
 717  */
 718 static int find_sector(flash_info_t * info, ulong addr)
 719 {
 720         int sector;
 721         for (sector = info->sector_count - 1; sector >= 0; sector--) {
 722                 if (addr >= info->start[sector])
 723                         break;
 724         }
 725         return sector;
 726 }
 727
 728 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp,
 729                                  int len)
 730 {
 731
 732         int sector;
 733         int cnt;
 734         int retcode;
 735         volatile cfiptr_t src;
 736         volatile cfiptr_t dst;
 737
 738         src.cp = cp;
 739         dst.cp = (uchar *) dest;
 740         sector = find_sector(info, dest);
 741         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 742         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
 743         if ((retcode = flash_status_check(info, sector, info->buffer_write_tout,
 744                                           "write to buffer")) == ERR_OK) {
 745                 switch (info->portwidth) {
 746                 case FLASH_CFI_8BIT:
 747                         cnt = len;
 748                         break;
 749                 case FLASH_CFI_16BIT:
 750                         cnt = len >> 1;
 751                         break;
 752                 case FLASH_CFI_32BIT:
 753                         cnt = len >> 2;
 754                         break;
 755                 default:
 756                         return ERR_INVAL;
 757                         break;
 758                 }
 759                 flash_write_cmd(info, sector, 0, (uchar) cnt - 1);
 760                 while (cnt-- > 0) {
 761                         switch (info->portwidth) {
 762                         case FLASH_CFI_8BIT:
 763                                 *dst.cp++ = *src.cp++;
 764                                 break;
 765                         case FLASH_CFI_16BIT:
 766                                 *dst.wp++ = *src.wp++;
 767                                 break;
 768                         case FLASH_CFI_32BIT:
 769                                 *dst.lp++ = *src.lp++;
 770                                 break;
 771                         default:
 772                                 return ERR_INVAL;
 773                                 break;
 774                         }
 775                 }
 776                 flash_write_cmd(info, sector, 0,
 777                                 FLASH_CMD_WRITE_BUFFER_CONFIRM);
 778                 retcode =
 779                     flash_full_status_check(info, sector,
 780                                             info->buffer_write_tout,
 781                                             "buffer write");
 782         }
 783         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 784         return retcode;
 785 }
 786 #endif                          /* CONFIG_SYS_USE_FLASH_BUFFER_WRITE */