board/esd/cpci440/strataflash.c

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