board/sbc405/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
  11 #undef  DEBUG_FLASH
  12 /*
  13  * This file implements a Common Flash Interface (CFI) driver for ppcboot.
  14  * The width of the port and the width of the chips are determined at initialization.
  15  * These widths are used to calculate the address for access CFI data structures.
  16  * It has been tested on an Intel Strataflash implementation.
  17  *
  18  * References
  19  * JEDEC Standard JESD68 - Common Flash Interface (CFI)
  20  * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
  21  * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
  22  * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
  23  *
  24  * TODO
  25  * Use Primary Extended Query table (PRI) and Alternate Algorithm Query Table (ALT) to determine if protection is available
  26  * Add support for other command sets Use the PRI and ALT to determine command set
  27  * Verify erase and program timeouts.
  28  */
  29
  30 #define FLASH_CMD_CFI                   0x98
  31 #define FLASH_CMD_READ_ID               0x90
  32 #define FLASH_CMD_RESET                 0xff
  33 #define FLASH_CMD_BLOCK_ERASE           0x20
  34 #define FLASH_CMD_ERASE_CONFIRM         0xD0
  35 #define FLASH_CMD_WRITE                 0x40
  36 #define FLASH_CMD_PROTECT               0x60
  37 #define FLASH_CMD_PROTECT_SET           0x01
  38 #define FLASH_CMD_PROTECT_CLEAR         0xD0
  39 #define FLASH_CMD_CLEAR_STATUS          0x50
  40 #define FLASH_CMD_WRITE_TO_BUFFER       0xE8
  41 #define FLASH_CMD_WRITE_BUFFER_CONFIRM  0xD0
  42
  43 #define FLASH_STATUS_DONE               0x80
  44 #define FLASH_STATUS_ESS                0x40
  45 #define FLASH_STATUS_ECLBS              0x20
  46 #define FLASH_STATUS_PSLBS              0x10
  47 #define FLASH_STATUS_VPENS              0x08
  48 #define FLASH_STATUS_PSS                0x04
  49 #define FLASH_STATUS_DPS                0x02
  50 #define FLASH_STATUS_R                  0x01
  51 #define FLASH_STATUS_PROTECT            0x01
  52
  53 #define FLASH_OFFSET_CFI                0x55
  54 #define FLASH_OFFSET_CFI_RESP           0x10
  55 #define FLASH_OFFSET_WTOUT              0x1F
  56 #define FLASH_OFFSET_WBTOUT             0x20
  57 #define FLASH_OFFSET_ETOUT              0x21
  58 #define FLASH_OFFSET_CETOUT             0x22
  59 #define FLASH_OFFSET_WMAX_TOUT          0x23
  60 #define FLASH_OFFSET_WBMAX_TOUT         0x24
  61 #define FLASH_OFFSET_EMAX_TOUT          0x25
  62 #define FLASH_OFFSET_CEMAX_TOUT         0x26
  63 #define FLASH_OFFSET_SIZE               0x27
  64 #define FLASH_OFFSET_INTERFACE          0x28
  65 #define FLASH_OFFSET_BUFFER_SIZE        0x2A
  66 #define FLASH_OFFSET_NUM_ERASE_REGIONS  0x2C
  67 #define FLASH_OFFSET_ERASE_REGIONS      0x2D
  68 #define FLASH_OFFSET_PROTECT            0x02
  69 #define FLASH_OFFSET_USER_PROTECTION    0x85
  70 #define FLASH_OFFSET_INTEL_PROTECTION   0x81
  71
  72
  73 #define FLASH_MAN_CFI                   0x01000000
  74
  75
  76 typedef union {
  77         unsigned char c;
  78         unsigned short w;
  79         unsigned long l;
  80 } cfiword_t;
  81
  82 typedef union {
  83         unsigned char * cp;
  84         unsigned short *wp;
  85         unsigned long *lp;
  86 } cfiptr_t;
  87
  88 #define NUM_ERASE_REGIONS 4
  89
  90 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
  91
  92
  93 /*-----------------------------------------------------------------------
  94  * Functions
  95  */
  96
  97
  98 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
  99 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
 100 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
 101 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
 102 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 103 static int flash_detect_cfi(flash_info_t * info);
 104 static ulong flash_get_size (ulong base, int banknum);
 105 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
 106 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
 107 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 108 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
 109 #endif
 110 /*-----------------------------------------------------------------------
 111  * create an address based on the offset and the port width
 112  */
 113 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
 114 {
 115         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
 116 }
 117 /*-----------------------------------------------------------------------
 118  * read a character at a port width address
 119  */
 120 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 121 {
 122         uchar *cp;
 123         cp = flash_make_addr(info, 0, offset);
 124         return (cp[info->portwidth - 1]);
 125 }
 126
 127 /*-----------------------------------------------------------------------
 128  * read a short word by swapping for ppc format.
 129  */
 130 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
 131 {
 132     uchar * addr;
 133
 134     addr = flash_make_addr(info, sect, offset);
 135     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
 136
 137 }
 138
 139 /*-----------------------------------------------------------------------
 140  * read a long word by picking the least significant byte of each maiximum
 141  * port size word. Swap for ppc format.
 142  */
 143 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
 144 {
 145     uchar * addr;
 146
 147     addr = flash_make_addr(info, sect, offset);
 148     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
 149             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
 150
 151 }
 152
 153 /*-----------------------------------------------------------------------
 154  */
 155 unsigned long flash_init (void)
 156 {
 157         unsigned long size;
 158         int i;
 159         unsigned long  address;
 160
 161
 162         /* The flash is positioned back to back, with the demultiplexing of the chip
 163          * based on the A24 address line.
 164          *
 165          */
 166
 167         address = CONFIG_SYS_FLASH_BASE;
 168         size = 0;
 169
 170         /* Init: no FLASHes known */
 171         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 172                 flash_info[i].flash_id = FLASH_UNKNOWN;
 173                 size += flash_info[i].size = flash_get_size(address, i);
 174                 address += CONFIG_SYS_FLASH_INCREMENT;
 175                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 176                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
 177                                 flash_info[0].size, flash_info[i].size<<20);
 178                 }
 179         }
 180
 181 #if 0 /* test-only */
 182         /* Monitor protection ON by default */
 183 #if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE)
 184         for(i=0; flash_info[0].start[i] < CONFIG_SYS_MONITOR_BASE+CONFIG_SYS_MONITOR_LEN-1; i++)
 185                 (void)flash_real_protect(&flash_info[0], i, 1);
 186 #endif
 187 #else
 188         /* monitor protection ON by default */
 189         flash_protect (FLAG_PROTECT_SET,
 190                        - CONFIG_SYS_MONITOR_LEN,
 191                        - 1, &flash_info[1]);
 192 #endif
 193
 194         return (size);
 195 }
 196
 197 /*-----------------------------------------------------------------------
 198  */
 199 int flash_erase (flash_info_t *info, int s_first, int s_last)
 200 {
 201         int rcode = 0;
 202         int prot;
 203         int sect;
 204
 205         if( info->flash_id != FLASH_MAN_CFI) {
 206                 printf ("Can't erase unknown flash type - aborted\n");
 207                 return 1;
 208         }
 209         if ((s_first < 0) || (s_first > s_last)) {
 210                 printf ("- no sectors to erase\n");
 211                 return 1;
 212         }
 213
 214         prot = 0;
 215         for (sect=s_first; sect<=s_last; ++sect) {
 216                 if (info->protect[sect]) {
 217                         prot++;
 218                 }
 219         }
 220         if (prot) {
 221                 printf ("- Warning: %d protected sectors will not be erased!\n",
 222                         prot);
 223         } else {
 224                 printf ("\n");
 225         }
 226
 227
 228         for (sect = s_first; sect<=s_last; sect++) {
 229                 if (info->protect[sect] == 0) { /* not protected */
 230                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 231                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 232                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 233
 234                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
 235                                 rcode = 1;
 236                         } else
 237                                 printf(".");
 238                 }
 239         }
 240         printf (" done\n");
 241         return rcode;
 242 }
 243
 244 /*-----------------------------------------------------------------------
 245  */
 246 void flash_print_info  (flash_info_t *info)
 247 {
 248         int i;
 249
 250         if (info->flash_id != FLASH_MAN_CFI) {
 251                 printf ("missing or unknown FLASH type\n");
 252                 return;
 253         }
 254
 255         printf("CFI conformant FLASH (%d x %d)",
 256                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
 257         printf ("  Size: %ld MB in %d Sectors\n",
 258                 info->size >> 20, info->sector_count);
 259         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 260                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
 261
 262         printf ("  Sector Start Addresses:");
 263         for (i=0; i<info->sector_count; ++i) {
 264 #ifdef CONFIG_SYS_FLASH_EMPTY_INFO
 265                 int k;
 266                 int size;
 267                 int erased;
 268                 volatile unsigned long *flash;
 269
 270                 /*
 271                  * Check if whole sector is erased
 272                  */
 273                 if (i != (info->sector_count-1))
 274                   size = info->start[i+1] - info->start[i];
 275                 else
 276                   size = info->start[0] + info->size - info->start[i];
 277                 erased = 1;
 278                 flash = (volatile unsigned long *)info->start[i];
 279                 size = size >> 2;        /* divide by 4 for longword access */
 280                 for (k=0; k<size; k++)
 281                   {
 282                     if (*flash++ != 0xffffffff)
 283                       {
 284                         erased = 0;
 285                         break;
 286                       }
 287                   }
 288
 289                 if ((i % 5) == 0)
 290                         printf ("\n   ");
 291                 /* print empty and read-only info */
 292                 printf (" %08lX%s%s",
 293                         info->start[i],
 294                         erased ? " E" : "  ",
 295                         info->protect[i] ? "RO " : "   ");
 296 #else
 297                 if ((i % 5) == 0)
 298                         printf ("\n   ");
 299                 printf (" %08lX%s",
 300                         info->start[i],
 301                         info->protect[i] ? " (RO)" : "     ");
 302 #endif
 303         }
 304         printf ("\n");
 305         return;
 306 }
 307
 308 /*-----------------------------------------------------------------------
 309  * Copy memory to flash, returns:
 310  * 0 - OK
 311  * 1 - write timeout
 312  * 2 - Flash not erased
 313  */
 314 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 315 {
 316         ulong wp;
 317         ulong cp;
 318         int aln;
 319         cfiword_t cword;
 320         int i, rc;
 321
 322         /* get lower aligned address */
 323         wp = (addr & ~(info->portwidth - 1));
 324
 325         /* handle unaligned start */
 326         if((aln = addr - wp) != 0) {
 327                 cword.l = 0;
 328                 cp = wp;
 329                 for(i=0;i<aln; ++i, ++cp)
 330                         flash_add_byte(info, &cword, (*(uchar *)cp));
 331
 332                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
 333                         flash_add_byte(info, &cword, *src++);
 334                         cnt--;
 335                         cp++;
 336                 }
 337                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 338                         flash_add_byte(info, &cword, (*(uchar *)cp));
 339                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 340                         return rc;
 341                 wp = cp;
 342         }
 343
 344 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 345         while(cnt >= info->portwidth) {
 346                 i = info->buffer_size > cnt? cnt: info->buffer_size;
 347                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
 348                         return rc;
 349                 wp += i;
 350                 src += i;
 351                 cnt -=i;
 352         }
 353 #else
 354         /* handle the aligned part */
 355         while(cnt >= info->portwidth) {
 356                 cword.l = 0;
 357                 for(i = 0; i < info->portwidth; i++) {
 358                         flash_add_byte(info, &cword, *src++);
 359                 }
 360                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 361                         return rc;
 362                 wp += info->portwidth;
 363                 cnt -= info->portwidth;
 364         }
 365 #endif /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */
 366         if (cnt == 0) {
 367                 return (0);
 368         }
 369
 370         /*
 371          * handle unaligned tail bytes
 372          */
 373         cword.l = 0;
 374         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
 375                 flash_add_byte(info, &cword, *src++);
 376                 --cnt;
 377         }
 378         for (; i<info->portwidth; ++i, ++cp) {
 379                 flash_add_byte(info, & cword, (*(uchar *)cp));
 380         }
 381
 382         return flash_write_cfiword(info, wp, cword);
 383 }
 384
 385 /*-----------------------------------------------------------------------
 386  */
 387 int flash_real_protect(flash_info_t *info, long sector, int prot)
 388 {
 389         int retcode = 0;
 390
 391         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 392         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 393         if(prot)
 394                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 395         else
 396                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 397
 398         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
 399                                          prot?"protect":"unprotect")) == 0) {
 400
 401                 info->protect[sector] = prot;
 402                 /* Intel's unprotect unprotects all locking */
 403                 if(prot == 0) {
 404                         int i;
 405                         for(i = 0 ; i<info->sector_count; i++) {
 406                                 if(info->protect[i])
 407                                         flash_real_protect(info, i, 1);
 408                         }
 409                 }
 410         }
 411
 412         return retcode;
 413 }
 414 /*-----------------------------------------------------------------------
 415  *  wait for XSR.7 to be set. Time out with an error if it does not.
 416  *  This routine does not set the flash to read-array mode.
 417  */
 418 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 419 {
 420         ulong start;
 421
 422         /* Wait for command completion */
 423         start = get_timer (0);
 424         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 425                 if (get_timer(start) > info->erase_blk_tout) {
 426                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
 427                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 428                         return ERR_TIMOUT;
 429                 }
 430         }
 431         return ERR_OK;
 432 }
 433 /*-----------------------------------------------------------------------
 434  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 435  * This routine sets the flash to read-array mode.
 436  */
 437 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 438 {
 439         int retcode;
 440         retcode = flash_status_check(info, sector, tout, prompt);
 441         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
 442                 retcode = ERR_INVAL;
 443                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
 444                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
 445                         printf("Command Sequence Error.\n");
 446                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
 447                         printf("Block Erase Error.\n");
 448                         retcode = ERR_NOT_ERASED;
 449                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 450                         printf("Locking Error\n");
 451                 }
 452                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
 453                         printf("Block locked.\n");
 454                         retcode = ERR_PROTECTED;
 455                 }
 456                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 457                         printf("Vpp Low Error.\n");
 458         }
 459         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 460         return retcode;
 461 }
 462 /*-----------------------------------------------------------------------
 463  */
 464 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
 465 {
 466         switch(info->portwidth) {
 467         case FLASH_CFI_8BIT:
 468                 cword->c = c;
 469                 break;
 470         case FLASH_CFI_16BIT:
 471                 cword->w = (cword->w << 8) | c;
 472                 break;
 473         case FLASH_CFI_32BIT:
 474                 cword->l = (cword->l << 8) | c;
 475         }
 476 }
 477
 478
 479 /*-----------------------------------------------------------------------
 480  * make a proper sized command based on the port and chip widths
 481  */
 482 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
 483 {
 484         int i;
 485         uchar *cp = (uchar *)cmdbuf;
 486         for(i=0; i< info->portwidth; i++)
 487                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
 488 }
 489
 490 /*
 491  * Write a proper sized command to the correct address
 492  */
 493 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
 494 {
 495
 496         volatile cfiptr_t addr;
 497         cfiword_t cword;
 498         addr.cp = flash_make_addr(info, sect, offset);
 499         flash_make_cmd(info, cmd, &cword);
 500         switch(info->portwidth) {
 501         case FLASH_CFI_8BIT:
 502                 *addr.cp = cword.c;
 503                 break;
 504         case FLASH_CFI_16BIT:
 505                 *addr.wp = cword.w;
 506                 break;
 507         case FLASH_CFI_32BIT:
 508                 *addr.lp = cword.l;
 509                 break;
 510         }
 511 }
 512
 513 /*-----------------------------------------------------------------------
 514  */
 515 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 516 {
 517         cfiptr_t cptr;
 518         cfiword_t cword;
 519         int retval;
 520         cptr.cp = flash_make_addr(info, sect, offset);
 521         flash_make_cmd(info, cmd, &cword);
 522         switch(info->portwidth) {
 523         case FLASH_CFI_8BIT:
 524                 retval = (cptr.cp[0] == cword.c);
 525                 break;
 526         case FLASH_CFI_16BIT:
 527                 retval = (cptr.wp[0] == cword.w);
 528                 break;
 529         case FLASH_CFI_32BIT:
 530                 retval = (cptr.lp[0] == cword.l);
 531                 break;
 532         default:
 533                 retval = 0;
 534                 break;
 535         }
 536         return retval;
 537 }
 538 /*-----------------------------------------------------------------------
 539  */
 540 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
 541 {
 542         cfiptr_t cptr;
 543         cfiword_t cword;
 544         int retval;
 545         cptr.cp = flash_make_addr(info, sect, offset);
 546         flash_make_cmd(info, cmd, &cword);
 547         switch(info->portwidth) {
 548         case FLASH_CFI_8BIT:
 549                 retval = ((cptr.cp[0] & cword.c) == cword.c);
 550                 break;
 551         case FLASH_CFI_16BIT:
 552                 retval = ((cptr.wp[0] & cword.w) == cword.w);
 553                 break;
 554         case FLASH_CFI_32BIT:
 555                 retval = ((cptr.lp[0] & cword.l) == cword.l);
 556                 break;
 557         default:
 558                 retval = 0;
 559                 break;
 560         }
 561         return retval;
 562 }
 563
 564 /*-----------------------------------------------------------------------
 565  * detect if flash is compatible with the Common Flash Interface (CFI)
 566  * http://www.jedec.org/download/search/jesd68.pdf
 567  *
 568 */
 569 static int flash_detect_cfi(flash_info_t * info)
 570 {
 571
 572         for(info->portwidth=FLASH_CFI_8BIT; info->portwidth <= FLASH_CFI_32BIT;
 573             info->portwidth <<= 1) {
 574                 for(info->chipwidth =FLASH_CFI_BY8;
 575                     info->chipwidth <= info->portwidth;
 576                     info->chipwidth <<= 1) {
 577                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 578                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI, FLASH_CMD_CFI);
 579                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
 580                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
 581                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
 582                                 return 1;
 583                 }
 584         }
 585         return 0;
 586 }
 587 /*
 588  * The following code cannot be run from FLASH!
 589  *
 590  */
 591 static ulong flash_get_size (ulong base, int banknum)
 592 {
 593         flash_info_t * info = &flash_info[banknum];
 594         int i, j;
 595         int sect_cnt;
 596         unsigned long sector;
 597         unsigned long tmp;
 598         int size_ratio;
 599         uchar num_erase_regions;
 600         int  erase_region_size;
 601         int  erase_region_count;
 602
 603         info->start[0] = base;
 604
 605         if(flash_detect_cfi(info)){
 606 #ifdef DEBUG_FLASH
 607                 printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth); /* test-only */
 608 #endif
 609                 size_ratio = info->portwidth / info->chipwidth;
 610                 num_erase_regions = flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
 611 #ifdef DEBUG_FLASH
 612                 printf("found %d erase regions\n", num_erase_regions);
 613 #endif
 614                 sect_cnt = 0;
 615                 sector = base;
 616                 for(i = 0 ; i < num_erase_regions; i++) {
 617                         if(i > NUM_ERASE_REGIONS) {
 618                                 printf("%d erase regions found, only %d used\n",
 619                                        num_erase_regions, NUM_ERASE_REGIONS);
 620                                 break;
 621                         }
 622                         tmp = flash_read_long(info, 0, FLASH_OFFSET_ERASE_REGIONS);
 623                         erase_region_size = (tmp & 0xffff)? ((tmp & 0xffff) * 256): 128;
 624                         tmp >>= 16;
 625                         erase_region_count = (tmp & 0xffff) +1;
 626                         for(j = 0; j< erase_region_count; j++) {
 627                                 info->start[sect_cnt] = sector;
 628                                 sector += (erase_region_size * size_ratio);
 629                                 info->protect[sect_cnt] = flash_isset(info, sect_cnt, FLASH_OFFSET_PROTECT, FLASH_STATUS_PROTECT);
 630                                 sect_cnt++;
 631                         }
 632                 }
 633
 634                 info->sector_count = sect_cnt;
 635                 /* multiply the size by the number of chips */
 636                 info->size = (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) * size_ratio;
 637                 info->buffer_size = (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
 638                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
 639                 info->erase_blk_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
 640                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
 641                 info->buffer_write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
 642                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
 643                 info->write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT)))/ 1000;
 644                 info->flash_id = FLASH_MAN_CFI;
 645         }
 646
 647         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 648         return(info->size);
 649 }
 650
 651
 652 /*-----------------------------------------------------------------------
 653  */
 654 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword)
 655 {
 656
 657         cfiptr_t cptr;
 658         int flag;
 659
 660         cptr.cp = (uchar *)dest;
 661
 662         /* Check if Flash is (sufficiently) erased */
 663         switch(info->portwidth) {
 664         case FLASH_CFI_8BIT:
 665                 flag = ((cptr.cp[0] & cword.c) == cword.c);
 666                 break;
 667         case FLASH_CFI_16BIT:
 668                 flag = ((cptr.wp[0] & cword.w) == cword.w);
 669                 break;
 670         case FLASH_CFI_32BIT:
 671                 flag = ((cptr.lp[0] & cword.l)  == cword.l);
 672                 break;
 673         default:
 674                 return 2;
 675         }
 676         if(!flag)
 677                 return 2;
 678
 679         /* Disable interrupts which might cause a timeout here */
 680         flag = disable_interrupts();
 681
 682         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
 683         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
 684
 685         switch(info->portwidth) {
 686         case FLASH_CFI_8BIT:
 687                 cptr.cp[0] = cword.c;
 688                 break;
 689         case FLASH_CFI_16BIT:
 690                 cptr.wp[0] = cword.w;
 691                 break;
 692         case FLASH_CFI_32BIT:
 693                 cptr.lp[0] = cword.l;
 694                 break;
 695         }
 696
 697         /* re-enable interrupts if necessary */
 698         if(flag)
 699                 enable_interrupts();
 700
 701         return flash_full_status_check(info, 0, info->write_tout, "write");
 702 }
 703
 704 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 705
 706 /* loop through the sectors from the highest address
 707  * when the passed address is greater or equal to the sector address
 708  * we have a match
 709  */
 710 static int find_sector(flash_info_t *info, ulong addr)
 711 {
 712         int sector;
 713         for(sector = info->sector_count - 1; sector >= 0; sector--) {
 714                 if(addr >= info->start[sector])
 715                         break;
 716         }
 717         return sector;
 718 }
 719
 720 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len)
 721 {
 722
 723         int sector;
 724         int cnt;
 725         int retcode;
 726         volatile cfiptr_t src;
 727         volatile cfiptr_t dst;
 728
 729         src.cp = cp;
 730         dst.cp = (uchar *)dest;
 731         sector = find_sector(info, dest);
 732         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 733         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
 734         if((retcode = flash_status_check(info, sector, info->buffer_write_tout,
 735                                          "write to buffer")) == ERR_OK) {
 736                 switch(info->portwidth) {
 737                 case FLASH_CFI_8BIT:
 738                         cnt = len;
 739                         break;
 740                 case FLASH_CFI_16BIT:
 741                         cnt = len >> 1;
 742                         break;
 743                 case FLASH_CFI_32BIT:
 744                         cnt = len >> 2;
 745                         break;
 746                 default:
 747                         return ERR_INVAL;
 748                         break;
 749                 }
 750                 flash_write_cmd(info, sector, 0, (uchar)cnt-1);
 751                 while(cnt-- > 0) {
 752                         switch(info->portwidth) {
 753                         case FLASH_CFI_8BIT:
 754                                 *dst.cp++ = *src.cp++;
 755                                 break;
 756                         case FLASH_CFI_16BIT:
 757                                 *dst.wp++ = *src.wp++;
 758                                 break;
 759                         case FLASH_CFI_32BIT:
 760                                 *dst.lp++ = *src.lp++;
 761                                 break;
 762                         default:
 763                                 return ERR_INVAL;
 764                                 break;
 765                         }
 766                 }
 767                 flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_BUFFER_CONFIRM);
 768                 retcode = flash_full_status_check(info, sector, info->buffer_write_tout,
 769                                              "buffer write");
 770         }
 771         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 772         return retcode;
 773 }
 774 #endif /* CONFIG_SYS_USE_FLASH_BUFFER_WRITE */