board/esd/apc405/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 ppcboot.
  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 #define FLASH_MAN_CFI                   0x01000000
  89
  90 typedef union {
  91         unsigned char c;
  92         unsigned short w;
  93         unsigned long l;
  94 } cfiword_t;
  95
  96 typedef union {
  97         unsigned char * cp;
  98         unsigned short *wp;
  99         unsigned long *lp;
 100 } cfiptr_t;
 101
 102 #define NUM_ERASE_REGIONS 4
 103
 104 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
 105
 106 /*-----------------------------------------------------------------------
 107  * Functions
 108  */
 109
 110 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
 111 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
 112 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
 113 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
 114 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 115 static int flash_detect_cfi(flash_info_t * info);
 116 static ulong flash_get_size (ulong base, int banknum);
 117 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
 118 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
 119 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 120 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
 121 #endif
 122 /*-----------------------------------------------------------------------
 123  * create an address based on the offset and the port width
 124  */
 125 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
 126 {
 127         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
 128 }
 129 /*-----------------------------------------------------------------------
 130  * read a character at a port width address
 131  */
 132 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 133 {
 134         uchar *cp;
 135         cp = flash_make_addr(info, 0, offset);
 136         return (cp[info->portwidth - 1]);
 137 }
 138
 139 /*-----------------------------------------------------------------------
 140  * read a short word by swapping for ppc format.
 141  */
 142 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
 143 {
 144     uchar * addr;
 145
 146     addr = flash_make_addr(info, sect, offset);
 147     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
 148
 149 }
 150
 151 /*-----------------------------------------------------------------------
 152  * read a long word by picking the least significant byte of each maiximum
 153  * port size word. Swap for ppc format.
 154  */
 155 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
 156 {
 157     uchar * addr;
 158
 159     addr = flash_make_addr(info, sect, offset);
 160     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
 161             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
 162
 163 }
 164
 165 /*-----------------------------------------------------------------------
 166  */
 167 unsigned long flash_init (void)
 168 {
 169         unsigned long size;
 170         int i;
 171         unsigned long  address;
 172
 173
 174         /* The flash is positioned back to back, with the demultiplexing of the chip
 175          * based on the A24 address line.
 176          *
 177          */
 178
 179         address = CFG_FLASH_BASE;
 180         size = 0;
 181
 182         /* Init: no FLASHes known */
 183         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
 184                 flash_info[i].flash_id = FLASH_UNKNOWN;
 185                 size += flash_info[i].size = flash_get_size(address, i);
 186                 address += CFG_FLASH_INCREMENT;
 187                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 188                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
 189                                 flash_info[0].size, flash_info[i].size<<20);
 190                 }
 191         }
 192
 193 #if 0 /* test-only */
 194         /* Monitor protection ON by default */
 195 #if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
 196         for(i=0; flash_info[0].start[i] < CFG_MONITOR_BASE+CFG_MONITOR_LEN-1; i++)
 197                 (void)flash_real_protect(&flash_info[0], i, 1);
 198 #endif
 199 #else
 200         /* monitor protection ON by default */
 201         flash_protect (FLAG_PROTECT_SET,
 202                        - CFG_MONITOR_LEN,
 203                        - 1, &flash_info[1]);
 204 #endif
 205
 206         return (size);
 207 }
 208
 209 /*-----------------------------------------------------------------------
 210  */
 211 int flash_erase (flash_info_t *info, int s_first, int s_last)
 212 {
 213         int rcode = 0;
 214         int prot;
 215         int sect;
 216
 217         if( info->flash_id != FLASH_MAN_CFI) {
 218                 printf ("Can't erase unknown flash type - aborted\n");
 219                 return 1;
 220         }
 221         if ((s_first < 0) || (s_first > s_last)) {
 222                 printf ("- no sectors to erase\n");
 223                 return 1;
 224         }
 225
 226         prot = 0;
 227         for (sect=s_first; sect<=s_last; ++sect) {
 228                 if (info->protect[sect]) {
 229                         prot++;
 230                 }
 231         }
 232         if (prot) {
 233                 printf ("- Warning: %d protected sectors will not be erased!\n",
 234                         prot);
 235         } else {
 236                 printf ("\n");
 237         }
 238
 239
 240         for (sect = s_first; sect<=s_last; sect++) {
 241                 if (info->protect[sect] == 0) { /* not protected */
 242                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 243                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 244                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 245
 246                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
 247                                 rcode = 1;
 248                         } else
 249                                 printf(".");
 250                 }
 251         }
 252         printf (" done\n");
 253         return rcode;
 254 }
 255
 256 /*-----------------------------------------------------------------------
 257  */
 258 void flash_print_info  (flash_info_t *info)
 259 {
 260         int i;
 261
 262         if (info->flash_id != FLASH_MAN_CFI) {
 263                 printf ("missing or unknown FLASH type\n");
 264                 return;
 265         }
 266
 267         printf("CFI conformant FLASH (%d x %d)",
 268                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
 269         printf ("  Size: %ld MB in %d Sectors\n",
 270                 info->size >> 20, info->sector_count);
 271         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 272                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
 273
 274         printf ("  Sector Start Addresses:");
 275         for (i=0; i<info->sector_count; ++i) {
 276 #ifdef CFG_FLASH_EMPTY_INFO
 277                 int k;
 278                 int size;
 279                 int erased;
 280                 volatile unsigned long *flash;
 281
 282                 /*
 283                  * Check if whole sector is erased
 284                  */
 285                 if (i != (info->sector_count-1))
 286                   size = info->start[i+1] - info->start[i];
 287                 else
 288                   size = info->start[0] + info->size - info->start[i];
 289                 erased = 1;
 290                 flash = (volatile unsigned long *)info->start[i];
 291                 size = size >> 2;        /* divide by 4 for longword access */
 292                 for (k=0; k<size; k++)
 293                   {
 294                     if (*flash++ != 0xffffffff)
 295                       {
 296                         erased = 0;
 297                         break;
 298                       }
 299                   }
 300
 301                 if ((i % 5) == 0)
 302                         printf ("\n   ");
 303                 /* print empty and read-only info */
 304                 printf (" %08lX%s%s",
 305                         info->start[i],
 306                         erased ? " E" : "  ",
 307                         info->protect[i] ? "RO " : "   ");
 308 #else
 309                 if ((i % 5) == 0)
 310                         printf ("\n   ");
 311                 printf (" %08lX%s",
 312                         info->start[i],
 313                         info->protect[i] ? " (RO)" : "     ");
 314 #endif
 315         }
 316         printf ("\n");
 317         return;
 318 }
 319
 320 /*-----------------------------------------------------------------------
 321  * Copy memory to flash, returns:
 322  * 0 - OK
 323  * 1 - write timeout
 324  * 2 - Flash not erased
 325  */
 326 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 327 {
 328         ulong wp;
 329         ulong cp;
 330         int aln;
 331         cfiword_t cword;
 332         int i, rc;
 333
 334         /* get lower aligned address */
 335         wp = (addr & ~(info->portwidth - 1));
 336
 337         /* handle unaligned start */
 338         if((aln = addr - wp) != 0) {
 339                 cword.l = 0;
 340                 cp = wp;
 341                 for(i=0;i<aln; ++i, ++cp)
 342                         flash_add_byte(info, &cword, (*(uchar *)cp));
 343
 344                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
 345                         flash_add_byte(info, &cword, *src++);
 346                         cnt--;
 347                         cp++;
 348                 }
 349                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 350                         flash_add_byte(info, &cword, (*(uchar *)cp));
 351                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 352                         return rc;
 353                 wp = cp;
 354         }
 355
 356 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 357         while(cnt >= info->portwidth) {
 358                 i = info->buffer_size > cnt? cnt: info->buffer_size;
 359                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
 360                         return rc;
 361                 wp += i;
 362                 src += i;
 363                 cnt -=i;
 364         }
 365 #else
 366         /* handle the aligned part */
 367         while(cnt >= info->portwidth) {
 368                 cword.l = 0;
 369                 for(i = 0; i < info->portwidth; i++) {
 370                         flash_add_byte(info, &cword, *src++);
 371                 }
 372                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 373                         return rc;
 374                 wp += info->portwidth;
 375                 cnt -= info->portwidth;
 376         }
 377 #endif /* CFG_FLASH_USE_BUFFER_WRITE */
 378         if (cnt == 0) {
 379                 return (0);
 380         }
 381
 382         /*
 383          * handle unaligned tail bytes
 384          */
 385         cword.l = 0;
 386         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
 387                 flash_add_byte(info, &cword, *src++);
 388                 --cnt;
 389         }
 390         for (; i<info->portwidth; ++i, ++cp) {
 391                 flash_add_byte(info, & cword, (*(uchar *)cp));
 392         }
 393
 394         return flash_write_cfiword(info, wp, cword);
 395 }
 396
 397 /*-----------------------------------------------------------------------
 398  */
 399 int flash_real_protect(flash_info_t *info, long sector, int prot)
 400 {
 401         int retcode = 0;
 402
 403         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 404         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 405         if(prot)
 406                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 407         else
 408                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 409
 410         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
 411                                          prot?"protect":"unprotect")) == 0) {
 412
 413                 info->protect[sector] = prot;
 414                 /* Intel's unprotect unprotects all locking */
 415                 if(prot == 0) {
 416                         int i;
 417                         for(i = 0 ; i<info->sector_count; i++) {
 418                                 if(info->protect[i])
 419                                         flash_real_protect(info, i, 1);
 420                         }
 421                 }
 422         }
 423
 424         return retcode;
 425 }
 426 /*-----------------------------------------------------------------------
 427  *  wait for XSR.7 to be set. Time out with an error if it does not.
 428  *  This routine does not set the flash to read-array mode.
 429  */
 430 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 431 {
 432         ulong start;
 433
 434         /* Wait for command completion */
 435         start = get_timer (0);
 436         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 437                 if (get_timer(start) > info->erase_blk_tout) {
 438                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
 439                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 440                         return ERR_TIMOUT;
 441                 }
 442         }
 443         return ERR_OK;
 444 }
 445 /*-----------------------------------------------------------------------
 446  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 447  * This routine sets the flash to read-array mode.
 448  */
 449 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 450 {
 451         int retcode;
 452         retcode = flash_status_check(info, sector, tout, prompt);
 453         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
 454                 retcode = ERR_INVAL;
 455                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
 456                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
 457                         printf("Command Sequence Error.\n");
 458                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
 459                         printf("Block Erase Error.\n");
 460                         retcode = ERR_NOT_ERASED;
 461                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 462                         printf("Locking Error\n");
 463                 }
 464                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
 465                         printf("Block locked.\n");
 466                         retcode = ERR_PROTECTED;
 467                 }
 468                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 469                         printf("Vpp Low Error.\n");
 470         }
 471         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 472         return retcode;
 473 }
 474 /*-----------------------------------------------------------------------
 475  */
 476 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
 477 {
 478         switch(info->portwidth) {
 479         case FLASH_CFI_8BIT:
 480                 cword->c = c;
 481                 break;
 482         case FLASH_CFI_16BIT:
 483                 cword->w = (cword->w << 8) | c;
 484                 break;
 485         case FLASH_CFI_32BIT:
 486                 cword->l = (cword->l << 8) | c;
 487         }
 488 }
 489
 490
 491 /*-----------------------------------------------------------------------
 492  * make a proper sized command based on the port and chip widths
 493  */
 494 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
 495 {
 496         int i;
 497         uchar *cp = (uchar *)cmdbuf;
 498         for(i=0; i< info->portwidth; i++)
 499                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
 500 }
 501
 502 /*
 503  * Write a proper sized command to the correct address
 504  */
 505 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
 506 {
 507
 508         volatile cfiptr_t addr;
 509         cfiword_t cword;
 510         addr.cp = flash_make_addr(info, sect, offset);
 511         flash_make_cmd(info, cmd, &cword);
 512         switch(info->portwidth) {
 513         case FLASH_CFI_8BIT:
 514                 *addr.cp = cword.c;
 515                 break;
 516         case FLASH_CFI_16BIT:
 517                 *addr.wp = cword.w;
 518                 break;
 519         case FLASH_CFI_32BIT:
 520                 *addr.lp = cword.l;
 521                 break;
 522         }
 523 }
 524
 525 /*-----------------------------------------------------------------------
 526  */
 527 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 528 {
 529         cfiptr_t cptr;
 530         cfiword_t cword;
 531         int retval;
 532         cptr.cp = flash_make_addr(info, sect, offset);
 533         flash_make_cmd(info, cmd, &cword);
 534         switch(info->portwidth) {
 535         case FLASH_CFI_8BIT:
 536                 retval = (cptr.cp[0] == cword.c);
 537                 break;
 538         case FLASH_CFI_16BIT:
 539                 retval = (cptr.wp[0] == cword.w);
 540                 break;
 541         case FLASH_CFI_32BIT:
 542                 retval = (cptr.lp[0] == cword.l);
 543                 break;
 544         default:
 545                 retval = 0;
 546                 break;
 547         }
 548         return retval;
 549 }
 550 /*-----------------------------------------------------------------------
 551  */
 552 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
 553 {
 554         cfiptr_t cptr;
 555         cfiword_t cword;
 556         int retval;
 557         cptr.cp = flash_make_addr(info, sect, offset);
 558         flash_make_cmd(info, cmd, &cword);
 559         switch(info->portwidth) {
 560         case FLASH_CFI_8BIT:
 561                 retval = ((cptr.cp[0] & cword.c) == cword.c);
 562                 break;
 563         case FLASH_CFI_16BIT:
 564                 retval = ((cptr.wp[0] & cword.w) == cword.w);
 565                 break;
 566         case FLASH_CFI_32BIT:
 567                 retval = ((cptr.lp[0] & cword.l) == cword.l);
 568                 break;
 569         default:
 570                 retval = 0;
 571                 break;
 572         }
 573         return retval;
 574 }
 575
 576 /*-----------------------------------------------------------------------
 577  * detect if flash is compatible with the Common Flash Interface (CFI)
 578  * http://www.jedec.org/download/search/jesd68.pdf
 579  *
 580 */
 581 static int flash_detect_cfi(flash_info_t * info)
 582 {
 583
 584         for(info->portwidth=FLASH_CFI_8BIT; info->portwidth <= FLASH_CFI_32BIT;
 585             info->portwidth <<= 1) {
 586                 for(info->chipwidth =FLASH_CFI_BY8;
 587                     info->chipwidth <= info->portwidth;
 588                     info->chipwidth <<= 1) {
 589                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 590                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI, FLASH_CMD_CFI);
 591                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
 592                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
 593                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
 594                                 return 1;
 595                 }
 596         }
 597         return 0;
 598 }
 599 /*
 600  * The following code cannot be run from FLASH!
 601  *
 602  */
 603 static ulong flash_get_size (ulong base, int banknum)
 604 {
 605         flash_info_t * info = &flash_info[banknum];
 606         int i, j;
 607         int sect_cnt;
 608         unsigned long sector;
 609         unsigned long tmp;
 610         int size_ratio;
 611         uchar num_erase_regions;
 612         int  erase_region_size;
 613         int  erase_region_count;
 614
 615         info->start[0] = base;
 616
 617         if(flash_detect_cfi(info)){
 618 #ifdef DEBUG_FLASH
 619                 printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth); /* test-only */
 620 #endif
 621                 size_ratio = info->portwidth / info->chipwidth;
 622                 num_erase_regions = flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
 623 #ifdef DEBUG_FLASH
 624                 printf("found %d erase regions\n", num_erase_regions);
 625 #endif
 626                 sect_cnt = 0;
 627                 sector = base;
 628                 for(i = 0 ; i < num_erase_regions; i++) {
 629                         if(i > NUM_ERASE_REGIONS) {
 630                                 printf("%d erase regions found, only %d used\n",
 631                                        num_erase_regions, NUM_ERASE_REGIONS);
 632                                 break;
 633                         }
 634                         tmp = flash_read_long(info, 0, FLASH_OFFSET_ERASE_REGIONS);
 635                         erase_region_size = (tmp & 0xffff)? ((tmp & 0xffff) * 256): 128;
 636                         tmp >>= 16;
 637                         erase_region_count = (tmp & 0xffff) +1;
 638                         for(j = 0; j< erase_region_count; j++) {
 639                                 info->start[sect_cnt] = sector;
 640                                 sector += (erase_region_size * size_ratio);
 641                                 info->protect[sect_cnt] = flash_isset(info, sect_cnt, FLASH_OFFSET_PROTECT, FLASH_STATUS_PROTECT);
 642                                 sect_cnt++;
 643                         }
 644                 }
 645
 646                 info->sector_count = sect_cnt;
 647                 /* multiply the size by the number of chips */
 648                 info->size = (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) * size_ratio;
 649                 info->buffer_size = (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
 650                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
 651                 info->erase_blk_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
 652                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
 653                 info->buffer_write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
 654                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
 655                 info->write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT)))/ 1000;
 656                 info->flash_id = FLASH_MAN_CFI;
 657         }
 658
 659         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 660         return(info->size);
 661 }
 662
 663
 664 /*-----------------------------------------------------------------------
 665  */
 666 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword)
 667 {
 668
 669         cfiptr_t ctladdr;
 670         cfiptr_t cptr;
 671         int flag;
 672
 673         ctladdr.cp = flash_make_addr(info, 0, 0);
 674         cptr.cp = (uchar *)dest;
 675
 676
 677         /* Check if Flash is (sufficiently) erased */
 678         switch(info->portwidth) {
 679         case FLASH_CFI_8BIT:
 680                 flag = ((cptr.cp[0] & cword.c) == cword.c);
 681                 break;
 682         case FLASH_CFI_16BIT:
 683                 flag = ((cptr.wp[0] & cword.w) == cword.w);
 684                 break;
 685         case FLASH_CFI_32BIT:
 686                 flag = ((cptr.lp[0] & cword.l)  == cword.l);
 687                 break;
 688         default:
 689                 return 2;
 690         }
 691         if(!flag)
 692                 return 2;
 693
 694         /* Disable interrupts which might cause a timeout here */
 695         flag = disable_interrupts();
 696
 697         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
 698         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
 699
 700         switch(info->portwidth) {
 701         case FLASH_CFI_8BIT:
 702                 cptr.cp[0] = cword.c;
 703                 break;
 704         case FLASH_CFI_16BIT:
 705                 cptr.wp[0] = cword.w;
 706                 break;
 707         case FLASH_CFI_32BIT:
 708                 cptr.lp[0] = cword.l;
 709                 break;
 710         }
 711
 712         /* re-enable interrupts if necessary */
 713         if(flag)
 714                 enable_interrupts();
 715
 716         return flash_full_status_check(info, 0, info->write_tout, "write");
 717 }
 718
 719 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 720
 721 /* loop through the sectors from the highest address
 722  * when the passed address is greater or equal to the sector address
 723  * we have a match
 724  */
 725 static int find_sector(flash_info_t *info, ulong addr)
 726 {
 727         int sector;
 728         for(sector = info->sector_count - 1; sector >= 0; sector--) {
 729                 if(addr >= info->start[sector])
 730                         break;
 731         }
 732         return sector;
 733 }
 734
 735 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len)
 736 {
 737
 738         int sector;
 739         int cnt;
 740         int retcode;
 741         volatile cfiptr_t src;
 742         volatile cfiptr_t dst;
 743
 744         src.cp = cp;
 745         dst.cp = (uchar *)dest;
 746         sector = find_sector(info, dest);
 747         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 748         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
 749         if((retcode = flash_status_check(info, sector, info->buffer_write_tout,
 750                                          "write to buffer")) == ERR_OK) {
 751                 switch(info->portwidth) {
 752                 case FLASH_CFI_8BIT:
 753                         cnt = len;
 754                         break;
 755                 case FLASH_CFI_16BIT:
 756                         cnt = len >> 1;
 757                         break;
 758                 case FLASH_CFI_32BIT:
 759                         cnt = len >> 2;
 760                         break;
 761                 default:
 762                         return ERR_INVAL;
 763                         break;
 764                 }
 765                 flash_write_cmd(info, sector, 0, (uchar)cnt-1);
 766                 while(cnt-- > 0) {
 767                         switch(info->portwidth) {
 768                         case FLASH_CFI_8BIT:
 769                                 *dst.cp++ = *src.cp++;
 770                                 break;
 771                         case FLASH_CFI_16BIT:
 772                                 *dst.wp++ = *src.wp++;
 773                                 break;
 774                         case FLASH_CFI_32BIT:
 775                                 *dst.lp++ = *src.lp++;
 776                                 break;
 777                         default:
 778                                 return ERR_INVAL;
 779                                 break;
 780                         }
 781                 }
 782                 flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_BUFFER_CONFIRM);
 783                 retcode = flash_full_status_check(info, sector, info->buffer_write_tout,
 784                                              "buffer write");
 785         }
 786         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 787         return retcode;
 788 }
 789 #endif /* CFG_USE_FLASH_BUFFER_WRITE */