board/ppmc8260/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 <mpc8260.h>
  26 #include <asm/processor.h>
  27
  28 #undef  DEBUG_FLASH
  29 /*
  30  * This file implements a Common Flash Interface (CFI) driver for U-Boot.
  31  * The width of the port and the width of the chips are determined at initialization.
  32  * These widths are used to calculate the address for access CFI data structures.
  33  * It has been tested on an Intel Strataflash implementation.
  34  *
  35  * References
  36  * JEDEC Standard JESD68 - Common Flash Interface (CFI)
  37  * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes
  38  * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets
  39  * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet
  40  *
  41  * TODO
  42  * Use Primary Extended Query table (PRI) and Alternate Algorithm Query Table (ALT) to determine if protection is available
  43  * Add support for other command sets Use the PRI and ALT to determine command set
  44  * Verify erase and program timeouts.
  45  */
  46
  47 #define FLASH_CMD_CFI                   0x98
  48 #define FLASH_CMD_READ_ID               0x90
  49 #define FLASH_CMD_RESET                 0xff
  50 #define FLASH_CMD_BLOCK_ERASE           0x20
  51 #define FLASH_CMD_ERASE_CONFIRM         0xD0
  52 #define FLASH_CMD_WRITE                 0x40
  53 #define FLASH_CMD_PROTECT               0x60
  54 #define FLASH_CMD_PROTECT_SET           0x01
  55 #define FLASH_CMD_PROTECT_CLEAR         0xD0
  56 #define FLASH_CMD_CLEAR_STATUS          0x50
  57 #define FLASH_CMD_WRITE_TO_BUFFER       0xE8
  58 #define FLASH_CMD_WRITE_BUFFER_CONFIRM  0xD0
  59
  60 #define FLASH_STATUS_DONE               0x80
  61 #define FLASH_STATUS_ESS                0x40
  62 #define FLASH_STATUS_ECLBS              0x20
  63 #define FLASH_STATUS_PSLBS              0x10
  64 #define FLASH_STATUS_VPENS              0x08
  65 #define FLASH_STATUS_PSS                0x04
  66 #define FLASH_STATUS_DPS                0x02
  67 #define FLASH_STATUS_R                  0x01
  68 #define FLASH_STATUS_PROTECT            0x01
  69
  70 #define FLASH_OFFSET_CFI                0x55
  71 #define FLASH_OFFSET_CFI_RESP           0x10
  72 #define FLASH_OFFSET_WTOUT              0x1F
  73 #define FLASH_OFFSET_WBTOUT             0x20
  74 #define FLASH_OFFSET_ETOUT              0x21
  75 #define FLASH_OFFSET_CETOUT             0x22
  76 #define FLASH_OFFSET_WMAX_TOUT          0x23
  77 #define FLASH_OFFSET_WBMAX_TOUT         0x24
  78 #define FLASH_OFFSET_EMAX_TOUT          0x25
  79 #define FLASH_OFFSET_CEMAX_TOUT         0x26
  80 #define FLASH_OFFSET_SIZE               0x27
  81 #define FLASH_OFFSET_INTERFACE          0x28
  82 #define FLASH_OFFSET_BUFFER_SIZE        0x2A
  83 #define FLASH_OFFSET_NUM_ERASE_REGIONS  0x2C
  84 #define FLASH_OFFSET_ERASE_REGIONS      0x2D
  85 #define FLASH_OFFSET_PROTECT            0x02
  86 #define FLASH_OFFSET_USER_PROTECTION    0x85
  87 #define FLASH_OFFSET_INTEL_PROTECTION   0x81
  88
  89
  90 #define FLASH_MAN_CFI                   0x01000000
  91
  92
  93
  94
  95 typedef union {
  96         unsigned char c;
  97         unsigned short w;
  98         unsigned long l;
  99 } cfiword_t;
 100
 101 typedef union {
 102         unsigned char * cp;
 103         unsigned short *wp;
 104         unsigned long *lp;
 105 } cfiptr_t;
 106
 107 #define NUM_ERASE_REGIONS 4
 108
 109 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
 110
 111
 112 /*-----------------------------------------------------------------------
 113  * Functions
 114  */
 115
 116
 117
 118 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
 119 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
 120 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
 121 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
 122 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 123 static int flash_detect_cfi(flash_info_t * info);
 124 static ulong flash_get_size (ulong base, int banknum);
 125 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
 126 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
 127 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 128 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
 129 #endif
 130 /*-----------------------------------------------------------------------
 131  * create an address based on the offset and the port width
 132  */
 133 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
 134 {
 135         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
 136 }
 137 /*-----------------------------------------------------------------------
 138  * read a character at a port width address
 139  */
 140 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 141 {
 142         uchar *cp;
 143         cp = flash_make_addr(info, 0, offset);
 144         return (cp[info->portwidth - 1]);
 145 }
 146
 147 /*-----------------------------------------------------------------------
 148  * read a short word by swapping for ppc format.
 149  */
 150 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
 151 {
 152     uchar * addr;
 153
 154     addr = flash_make_addr(info, sect, offset);
 155     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
 156
 157 }
 158
 159 /*-----------------------------------------------------------------------
 160  * read a long word by picking the least significant byte of each maiximum
 161  * port size word. Swap for ppc format.
 162  */
 163 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
 164 {
 165     uchar * addr;
 166
 167     addr = flash_make_addr(info, sect, offset);
 168     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
 169             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
 170
 171 }
 172
 173 /*-----------------------------------------------------------------------
 174  */
 175 unsigned long flash_init (void)
 176 {
 177         unsigned long size;
 178         int i;
 179         unsigned long  address;
 180
 181
 182         /* The flash is positioned back to back, with the demultiplexing of the chip
 183          * based on the A24 address line.
 184          *
 185          */
 186
 187         address = CFG_FLASH_BASE;
 188         size = 0;
 189
 190
 191         /* Init: no FLASHes known */
 192         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
 193                 flash_info[i].flash_id = FLASH_UNKNOWN;
 194                 size += flash_info[i].size = flash_get_size(address, i);
 195                 address += CFG_FLASH_INCREMENT;
 196                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 197                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
 198                                 flash_info[0].size, flash_info[i].size<<20);
 199                 }
 200         }
 201
 202         /* Monitor protection ON by default */
 203 #if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
 204         for(i=0; flash_info[0].start[i] < CFG_MONITOR_BASE+CFG_MONITOR_LEN-1; i++)
 205                 (void)flash_real_protect(&flash_info[0], i, 1);
 206 #endif
 207
 208         return (size);
 209 }
 210
 211 /*-----------------------------------------------------------------------
 212  */
 213 int flash_erase (flash_info_t *info, int s_first, int s_last)
 214 {
 215         int rcode = 0;
 216         int prot;
 217         int sect;
 218
 219         if( info->flash_id != FLASH_MAN_CFI) {
 220                 printf ("Can't erase unknown flash type - aborted\n");
 221                 return 1;
 222         }
 223         if ((s_first < 0) || (s_first > s_last)) {
 224                 printf ("- no sectors to erase\n");
 225                 return 1;
 226         }
 227
 228         prot = 0;
 229         for (sect=s_first; sect<=s_last; ++sect) {
 230                 if (info->protect[sect]) {
 231                         prot++;
 232                 }
 233         }
 234         if (prot) {
 235                 printf ("- Warning: %d protected sectors will not be erased!\n",
 236                         prot);
 237         } else {
 238                 printf ("\n");
 239         }
 240
 241
 242         for (sect = s_first; sect<=s_last; sect++) {
 243                 if (info->protect[sect] == 0) { /* not protected */
 244                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 245                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 246                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 247
 248                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
 249                                 rcode = 1;
 250                         } else
 251                                 printf(".");
 252                 }
 253         }
 254         printf (" done\n");
 255         return rcode;
 256 }
 257
 258 /*-----------------------------------------------------------------------
 259  */
 260 void flash_print_info  (flash_info_t *info)
 261 {
 262         int i;
 263
 264         if (info->flash_id != FLASH_MAN_CFI) {
 265                 printf ("missing or unknown FLASH type\n");
 266                 return;
 267         }
 268
 269         printf("CFI conformant FLASH (%d x %d)",
 270                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
 271         printf ("  Size: %ld MB in %d Sectors\n",
 272                 info->size >> 20, info->sector_count);
 273         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 274                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
 275
 276         printf ("  Sector Start Addresses:");
 277         for (i=0; i<info->sector_count; ++i) {
 278                 if ((i % 5) == 0)
 279                         printf ("\n");
 280                 printf (" %08lX%5s",
 281                         info->start[i],
 282                         info->protect[i] ? " (RO)" : " "
 283                         );
 284         }
 285         printf ("\n");
 286         return;
 287 }
 288
 289 /*-----------------------------------------------------------------------
 290  * Copy memory to flash, returns:
 291  * 0 - OK
 292  * 1 - write timeout
 293  * 2 - Flash not erased
 294  */
 295 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 296 {
 297         ulong wp;
 298         ulong cp;
 299         int aln;
 300         cfiword_t cword;
 301         int i, rc;
 302
 303         /* get lower aligned address */
 304         wp = (addr & ~(info->portwidth - 1));
 305
 306         /* handle unaligned start */
 307         if((aln = addr - wp) != 0) {
 308                 cword.l = 0;
 309                 cp = wp;
 310                 for(i=0;i<aln; ++i, ++cp)
 311                         flash_add_byte(info, &cword, (*(uchar *)cp));
 312
 313                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
 314                         flash_add_byte(info, &cword, *src++);
 315                         cnt--;
 316                         cp++;
 317                 }
 318                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 319                         flash_add_byte(info, &cword, (*(uchar *)cp));
 320                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 321                         return rc;
 322                 wp = cp;
 323         }
 324
 325 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 326         while(cnt >= info->portwidth) {
 327                 i = info->buffer_size > cnt? cnt: info->buffer_size;
 328                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
 329                         return rc;
 330                 wp += i;
 331                 src += i;
 332                 cnt -=i;
 333         }
 334 #else
 335         /* handle the aligned part */
 336         while(cnt >= info->portwidth) {
 337                 cword.l = 0;
 338                 for(i = 0; i < info->portwidth; i++) {
 339                         flash_add_byte(info, &cword, *src++);
 340                 }
 341                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 342                         return rc;
 343                 wp += info->portwidth;
 344                 cnt -= info->portwidth;
 345         }
 346 #endif /* CFG_FLASH_USE_BUFFER_WRITE */
 347         if (cnt == 0) {
 348                 return (0);
 349         }
 350
 351         /*
 352          * handle unaligned tail bytes
 353          */
 354         cword.l = 0;
 355         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
 356                 flash_add_byte(info, &cword, *src++);
 357                 --cnt;
 358         }
 359         for (; i<info->portwidth; ++i, ++cp) {
 360                 flash_add_byte(info, & cword, (*(uchar *)cp));
 361         }
 362
 363         return flash_write_cfiword(info, wp, cword);
 364 }
 365
 366 /*-----------------------------------------------------------------------
 367  */
 368 int flash_real_protect(flash_info_t *info, long sector, int prot)
 369 {
 370         int retcode = 0;
 371
 372         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 373         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 374         if(prot)
 375                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 376         else
 377                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 378
 379         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
 380                                          prot?"protect":"unprotect")) == 0) {
 381
 382                 info->protect[sector] = prot;
 383                 /* Intel's unprotect unprotects all locking */
 384                 if(prot == 0) {
 385                         int i;
 386                         for(i = 0 ; i<info->sector_count; i++) {
 387                                 if(info->protect[i])
 388                                         flash_real_protect(info, i, 1);
 389                         }
 390                 }
 391         }
 392
 393         return retcode;
 394 }
 395 /*-----------------------------------------------------------------------
 396  *  wait for XSR.7 to be set. Time out with an error if it does not.
 397  *  This routine does not set the flash to read-array mode.
 398  */
 399 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 400 {
 401         ulong start;
 402
 403         /* Wait for command completion */
 404         start = get_timer (0);
 405         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 406                 if (get_timer(start) > info->erase_blk_tout) {
 407                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
 408                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 409                         return ERR_TIMOUT;
 410                 }
 411         }
 412         return ERR_OK;
 413 }
 414 /*-----------------------------------------------------------------------
 415  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 416  * This routine sets the flash to read-array mode.
 417  */
 418 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 419 {
 420         int retcode;
 421         retcode = flash_status_check(info, sector, tout, prompt);
 422         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
 423                 retcode = ERR_INVAL;
 424                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
 425                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
 426                         printf("Command Sequence Error.\n");
 427                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
 428                         printf("Block Erase Error.\n");
 429                         retcode = ERR_NOT_ERASED;
 430                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 431                         printf("Locking Error\n");
 432                 }
 433                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
 434                         printf("Block locked.\n");
 435                         retcode = ERR_PROTECTED;
 436                 }
 437                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 438                         printf("Vpp Low Error.\n");
 439         }
 440         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 441         return retcode;
 442 }
 443 /*-----------------------------------------------------------------------
 444  */
 445 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
 446 {
 447         switch(info->portwidth) {
 448         case FLASH_CFI_8BIT:
 449                 cword->c = c;
 450                 break;
 451         case FLASH_CFI_16BIT:
 452                 cword->w = (cword->w << 8) | c;
 453                 break;
 454         case FLASH_CFI_32BIT:
 455                 cword->l = (cword->l << 8) | c;
 456         }
 457 }
 458
 459
 460 /*-----------------------------------------------------------------------
 461  * make a proper sized command based on the port and chip widths
 462  */
 463 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
 464 {
 465         int i;
 466         uchar *cp = (uchar *)cmdbuf;
 467         for(i=0; i< info->portwidth; i++)
 468                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
 469 }
 470
 471 /*
 472  * Write a proper sized command to the correct address
 473  */
 474 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
 475 {
 476
 477         volatile cfiptr_t addr;
 478         cfiword_t cword;
 479         addr.cp = flash_make_addr(info, sect, offset);
 480         flash_make_cmd(info, cmd, &cword);
 481         switch(info->portwidth) {
 482         case FLASH_CFI_8BIT:
 483                 *addr.cp = cword.c;
 484                 break;
 485         case FLASH_CFI_16BIT:
 486                 *addr.wp = cword.w;
 487                 break;
 488         case FLASH_CFI_32BIT:
 489                 *addr.lp = cword.l;
 490                 break;
 491         }
 492 }
 493
 494 /*-----------------------------------------------------------------------
 495  */
 496 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 497 {
 498         cfiptr_t cptr;
 499         cfiword_t cword;
 500         int retval;
 501         cptr.cp = flash_make_addr(info, sect, offset);
 502         flash_make_cmd(info, cmd, &cword);
 503         switch(info->portwidth) {
 504         case FLASH_CFI_8BIT:
 505                 retval = (cptr.cp[0] == cword.c);
 506                 break;
 507         case FLASH_CFI_16BIT:
 508                 retval = (cptr.wp[0] == cword.w);
 509                 break;
 510         case FLASH_CFI_32BIT:
 511                 retval = (cptr.lp[0] == cword.l);
 512                 break;
 513         default:
 514                 retval = 0;
 515                 break;
 516         }
 517         return retval;
 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; info->portwidth <= FLASH_CFI_32BIT;
 554             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, FLASH_CMD_CFI);
 560                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
 561                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
 562                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
 563                                 return 1;
 564                 }
 565         }
 566         return 0;
 567 }
 568 /*
 569  * The following code cannot be run from FLASH!
 570  *
 571  */
 572 static ulong flash_get_size (ulong base, int banknum)
 573 {
 574         flash_info_t * info = &flash_info[banknum];
 575         int i, j;
 576         int sect_cnt;
 577         unsigned long sector;
 578         unsigned long tmp;
 579         int size_ratio;
 580         uchar num_erase_regions;
 581         int  erase_region_size;
 582         int  erase_region_count;
 583
 584         info->start[0] = base;
 585
 586         if(flash_detect_cfi(info)){
 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 */