board/esd/pmc405/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
  89 #define FLASH_MAN_CFI                   0x01000000
  90
  91
  92
  93
  94 typedef union {
  95         unsigned char c;
  96         unsigned short w;
  97         unsigned long l;
  98 } cfiword_t;
  99
 100 typedef union {
 101         unsigned char * cp;
 102         unsigned short *wp;
 103         unsigned long *lp;
 104 } cfiptr_t;
 105
 106 #define NUM_ERASE_REGIONS 4
 107
 108 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
 109
 110
 111 /*-----------------------------------------------------------------------
 112  * Functions
 113  */
 114
 115
 116
 117 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
 118 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
 119 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
 120 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
 121 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 122 static int flash_detect_cfi(flash_info_t * info);
 123 static ulong flash_get_size (ulong base, int banknum);
 124 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
 125 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
 126 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 127 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
 128 #endif
 129 /*-----------------------------------------------------------------------
 130  * create an address based on the offset and the port width
 131  */
 132 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
 133 {
 134         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
 135 }
 136 /*-----------------------------------------------------------------------
 137  * read a character at a port width address
 138  */
 139 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 140 {
 141         uchar *cp;
 142         cp = flash_make_addr(info, 0, offset);
 143         return (cp[info->portwidth - 1]);
 144 }
 145
 146 /*-----------------------------------------------------------------------
 147  * read a short word by swapping for ppc format.
 148  */
 149 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
 150 {
 151     uchar * addr;
 152
 153     addr = flash_make_addr(info, sect, offset);
 154     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
 155
 156 }
 157
 158 /*-----------------------------------------------------------------------
 159  * read a long word by picking the least significant byte of each maiximum
 160  * port size word. Swap for ppc format.
 161  */
 162 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
 163 {
 164     uchar * addr;
 165
 166     addr = flash_make_addr(info, sect, offset);
 167     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
 168             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
 169
 170 }
 171
 172 /*-----------------------------------------------------------------------
 173  */
 174 unsigned long flash_init (void)
 175 {
 176         unsigned long size;
 177         int i;
 178         unsigned long  address;
 179
 180
 181         /* The flash is positioned back to back, with the demultiplexing of the chip
 182          * based on the A24 address line.
 183          *
 184          */
 185
 186         address = CFG_FLASH_BASE;
 187         size = 0;
 188
 189         /* Init: no FLASHes known */
 190         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
 191                 flash_info[i].flash_id = FLASH_UNKNOWN;
 192                 size += flash_info[i].size = flash_get_size(address, i);
 193                 address += CFG_FLASH_INCREMENT;
 194                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 195                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
 196                                 flash_info[0].size, flash_info[i].size<<20);
 197                 }
 198         }
 199
 200 #if 0 /* test-only */
 201         /* Monitor protection ON by default */
 202 #if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
 203         for(i=0; flash_info[0].start[i] < CFG_MONITOR_BASE+CFG_MONITOR_LEN-1; i++)
 204                 (void)flash_real_protect(&flash_info[0], i, 1);
 205 #endif
 206 #else
 207         /* monitor protection ON by default */
 208         flash_protect (FLAG_PROTECT_SET,
 209                        - CFG_MONITOR_LEN,
 210                        - 1, &flash_info[1]);
 211 #endif
 212
 213         return (size);
 214 }
 215
 216 /*-----------------------------------------------------------------------
 217  */
 218 int flash_erase (flash_info_t *info, int s_first, int s_last)
 219 {
 220         int rcode = 0;
 221         int prot;
 222         int sect;
 223
 224         if( info->flash_id != FLASH_MAN_CFI) {
 225                 printf ("Can't erase unknown flash type - aborted\n");
 226                 return 1;
 227         }
 228         if ((s_first < 0) || (s_first > s_last)) {
 229                 printf ("- no sectors to erase\n");
 230                 return 1;
 231         }
 232
 233         prot = 0;
 234         for (sect=s_first; sect<=s_last; ++sect) {
 235                 if (info->protect[sect]) {
 236                         prot++;
 237                 }
 238         }
 239         if (prot) {
 240                 printf ("- Warning: %d protected sectors will not be erased!\n",
 241                         prot);
 242         } else {
 243                 printf ("\n");
 244         }
 245
 246
 247         for (sect = s_first; sect<=s_last; sect++) {
 248                 if (info->protect[sect] == 0) { /* not protected */
 249                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 250                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 251                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 252
 253                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
 254                                 rcode = 1;
 255                         } else
 256                                 printf(".");
 257                 }
 258         }
 259         printf (" done\n");
 260         return rcode;
 261 }
 262
 263 /*-----------------------------------------------------------------------
 264  */
 265 void flash_print_info  (flash_info_t *info)
 266 {
 267         int i;
 268
 269         if (info->flash_id != FLASH_MAN_CFI) {
 270                 printf ("missing or unknown FLASH type\n");
 271                 return;
 272         }
 273
 274         printf("CFI conformant FLASH (%d x %d)",
 275                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
 276         printf ("  Size: %ld MB in %d Sectors\n",
 277                 info->size >> 20, info->sector_count);
 278         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 279                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
 280
 281         printf ("  Sector Start Addresses:");
 282         for (i=0; i<info->sector_count; ++i) {
 283 #ifdef CFG_FLASH_EMPTY_INFO
 284                 int k;
 285                 int size;
 286                 int erased;
 287                 volatile unsigned long *flash;
 288
 289                 /*
 290                  * Check if whole sector is erased
 291                  */
 292                 if (i != (info->sector_count-1))
 293                   size = info->start[i+1] - info->start[i];
 294                 else
 295                   size = info->start[0] + info->size - info->start[i];
 296                 erased = 1;
 297                 flash = (volatile unsigned long *)info->start[i];
 298                 size = size >> 2;        /* divide by 4 for longword access */
 299                 for (k=0; k<size; k++)
 300                   {
 301                     if (*flash++ != 0xffffffff)
 302                       {
 303                         erased = 0;
 304                         break;
 305                       }
 306                   }
 307
 308                 if ((i % 5) == 0)
 309                         printf ("\n   ");
 310                 /* print empty and read-only info */
 311                 printf (" %08lX%s%s",
 312                         info->start[i],
 313                         erased ? " E" : "  ",
 314                         info->protect[i] ? "RO " : "   ");
 315 #else
 316                 if ((i % 5) == 0)
 317                         printf ("\n   ");
 318                 printf (" %08lX%s",
 319                         info->start[i],
 320                         info->protect[i] ? " (RO)" : "     ");
 321 #endif
 322         }
 323         printf ("\n");
 324         return;
 325 }
 326
 327 /*-----------------------------------------------------------------------
 328  * Copy memory to flash, returns:
 329  * 0 - OK
 330  * 1 - write timeout
 331  * 2 - Flash not erased
 332  */
 333 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 334 {
 335         ulong wp;
 336         ulong cp;
 337         int aln;
 338         cfiword_t cword;
 339         int i, rc;
 340
 341         /* get lower aligned address */
 342         wp = (addr & ~(info->portwidth - 1));
 343
 344         /* handle unaligned start */
 345         if((aln = addr - wp) != 0) {
 346                 cword.l = 0;
 347                 cp = wp;
 348                 for(i=0;i<aln; ++i, ++cp)
 349                         flash_add_byte(info, &cword, (*(uchar *)cp));
 350
 351                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
 352                         flash_add_byte(info, &cword, *src++);
 353                         cnt--;
 354                         cp++;
 355                 }
 356                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 357                         flash_add_byte(info, &cword, (*(uchar *)cp));
 358                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 359                         return rc;
 360                 wp = cp;
 361         }
 362
 363 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 364         while(cnt >= info->portwidth) {
 365                 i = info->buffer_size > cnt? cnt: info->buffer_size;
 366                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
 367                         return rc;
 368                 wp += i;
 369                 src += i;
 370                 cnt -=i;
 371         }
 372 #else
 373         /* handle the aligned part */
 374         while(cnt >= info->portwidth) {
 375                 cword.l = 0;
 376                 for(i = 0; i < info->portwidth; i++) {
 377                         flash_add_byte(info, &cword, *src++);
 378                 }
 379                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 380                         return rc;
 381                 wp += info->portwidth;
 382                 cnt -= info->portwidth;
 383         }
 384 #endif /* CFG_FLASH_USE_BUFFER_WRITE */
 385         if (cnt == 0) {
 386                 return (0);
 387         }
 388
 389         /*
 390          * handle unaligned tail bytes
 391          */
 392         cword.l = 0;
 393         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
 394                 flash_add_byte(info, &cword, *src++);
 395                 --cnt;
 396         }
 397         for (; i<info->portwidth; ++i, ++cp) {
 398                 flash_add_byte(info, & cword, (*(uchar *)cp));
 399         }
 400
 401         return flash_write_cfiword(info, wp, cword);
 402 }
 403
 404 /*-----------------------------------------------------------------------
 405  */
 406 int flash_real_protect(flash_info_t *info, long sector, int prot)
 407 {
 408         int retcode = 0;
 409
 410         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 411         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 412         if(prot)
 413                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 414         else
 415                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 416
 417         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
 418                                          prot?"protect":"unprotect")) == 0) {
 419
 420                 info->protect[sector] = prot;
 421                 /* Intel's unprotect unprotects all locking */
 422                 if(prot == 0) {
 423                         int i;
 424                         for(i = 0 ; i<info->sector_count; i++) {
 425                                 if(info->protect[i])
 426                                         flash_real_protect(info, i, 1);
 427                         }
 428                 }
 429         }
 430
 431         return retcode;
 432 }
 433 /*-----------------------------------------------------------------------
 434  *  wait for XSR.7 to be set. Time out with an error if it does not.
 435  *  This routine does not set the flash to read-array mode.
 436  */
 437 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 438 {
 439         ulong start;
 440
 441         /* Wait for command completion */
 442         start = get_timer (0);
 443         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 444                 if (get_timer(start) > info->erase_blk_tout) {
 445                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
 446                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 447                         return ERR_TIMOUT;
 448                 }
 449         }
 450         return ERR_OK;
 451 }
 452 /*-----------------------------------------------------------------------
 453  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 454  * This routine sets the flash to read-array mode.
 455  */
 456 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 457 {
 458         int retcode;
 459         retcode = flash_status_check(info, sector, tout, prompt);
 460         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
 461                 retcode = ERR_INVAL;
 462                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
 463                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
 464                         printf("Command Sequence Error.\n");
 465                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
 466                         printf("Block Erase Error.\n");
 467                         retcode = ERR_NOT_ERASED;
 468                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 469                         printf("Locking Error\n");
 470                 }
 471                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
 472                         printf("Block locked.\n");
 473                         retcode = ERR_PROTECTED;
 474                 }
 475                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 476                         printf("Vpp Low Error.\n");
 477         }
 478         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 479         return retcode;
 480 }
 481 /*-----------------------------------------------------------------------
 482  */
 483 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
 484 {
 485         switch(info->portwidth) {
 486         case FLASH_CFI_8BIT:
 487                 cword->c = c;
 488                 break;
 489         case FLASH_CFI_16BIT:
 490                 cword->w = (cword->w << 8) | c;
 491                 break;
 492         case FLASH_CFI_32BIT:
 493                 cword->l = (cword->l << 8) | c;
 494         }
 495 }
 496
 497
 498 /*-----------------------------------------------------------------------
 499  * make a proper sized command based on the port and chip widths
 500  */
 501 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
 502 {
 503         int i;
 504         uchar *cp = (uchar *)cmdbuf;
 505         for(i=0; i< info->portwidth; i++)
 506                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
 507 }
 508
 509 /*
 510  * Write a proper sized command to the correct address
 511  */
 512 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
 513 {
 514
 515         volatile cfiptr_t addr;
 516         cfiword_t cword;
 517         addr.cp = flash_make_addr(info, sect, offset);
 518         flash_make_cmd(info, cmd, &cword);
 519         switch(info->portwidth) {
 520         case FLASH_CFI_8BIT:
 521                 *addr.cp = cword.c;
 522                 break;
 523         case FLASH_CFI_16BIT:
 524                 *addr.wp = cword.w;
 525                 break;
 526         case FLASH_CFI_32BIT:
 527                 *addr.lp = cword.l;
 528                 break;
 529         }
 530 }
 531
 532 /*-----------------------------------------------------------------------
 533  */
 534 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 535 {
 536         cfiptr_t cptr;
 537         cfiword_t cword;
 538         int retval;
 539         cptr.cp = flash_make_addr(info, sect, offset);
 540         flash_make_cmd(info, cmd, &cword);
 541         switch(info->portwidth) {
 542         case FLASH_CFI_8BIT:
 543                 retval = (cptr.cp[0] == cword.c);
 544                 break;
 545         case FLASH_CFI_16BIT:
 546                 retval = (cptr.wp[0] == cword.w);
 547                 break;
 548         case FLASH_CFI_32BIT:
 549                 retval = (cptr.lp[0] == cword.l);
 550                 break;
 551         default:
 552                 retval = 0;
 553                 break;
 554         }
 555         return retval;
 556 }
 557 /*-----------------------------------------------------------------------
 558  */
 559 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
 560 {
 561         cfiptr_t cptr;
 562         cfiword_t cword;
 563         int retval;
 564         cptr.cp = flash_make_addr(info, sect, offset);
 565         flash_make_cmd(info, cmd, &cword);
 566         switch(info->portwidth) {
 567         case FLASH_CFI_8BIT:
 568                 retval = ((cptr.cp[0] & cword.c) == cword.c);
 569                 break;
 570         case FLASH_CFI_16BIT:
 571                 retval = ((cptr.wp[0] & cword.w) == cword.w);
 572                 break;
 573         case FLASH_CFI_32BIT:
 574                 retval = ((cptr.lp[0] & cword.l) == cword.l);
 575                 break;
 576         default:
 577                 retval = 0;
 578                 break;
 579         }
 580         return retval;
 581 }
 582
 583 /*-----------------------------------------------------------------------
 584  * detect if flash is compatible with the Common Flash Interface (CFI)
 585  * http://www.jedec.org/download/search/jesd68.pdf
 586  *
 587 */
 588 static int flash_detect_cfi(flash_info_t * info)
 589 {
 590
 591         for(info->portwidth=FLASH_CFI_8BIT; info->portwidth <= FLASH_CFI_32BIT;
 592             info->portwidth <<= 1) {
 593                 for(info->chipwidth =FLASH_CFI_BY8;
 594                     info->chipwidth <= info->portwidth;
 595                     info->chipwidth <<= 1) {
 596                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 597                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI, FLASH_CMD_CFI);
 598                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
 599                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
 600                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
 601                                 return 1;
 602                 }
 603         }
 604         return 0;
 605 }
 606 /*
 607  * The following code cannot be run from FLASH!
 608  *
 609  */
 610 static ulong flash_get_size (ulong base, int banknum)
 611 {
 612         flash_info_t * info = &flash_info[banknum];
 613         int i, j;
 614         int sect_cnt;
 615         unsigned long sector;
 616         unsigned long tmp;
 617         int size_ratio;
 618         uchar num_erase_regions;
 619         int  erase_region_size;
 620         int  erase_region_count;
 621
 622         info->start[0] = base;
 623
 624         if(flash_detect_cfi(info)){
 625 #ifdef DEBUG_FLASH
 626                 printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth); /* test-only */
 627 #endif
 628                 size_ratio = info->portwidth / info->chipwidth;
 629                 num_erase_regions = flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
 630 #ifdef DEBUG_FLASH
 631                 printf("found %d erase regions\n", num_erase_regions);
 632 #endif
 633                 sect_cnt = 0;
 634                 sector = base;
 635                 for(i = 0 ; i < num_erase_regions; i++) {
 636                         if(i > NUM_ERASE_REGIONS) {
 637                                 printf("%d erase regions found, only %d used\n",
 638                                        num_erase_regions, NUM_ERASE_REGIONS);
 639                                 break;
 640                         }
 641                         tmp = flash_read_long(info, 0, FLASH_OFFSET_ERASE_REGIONS);
 642                         erase_region_size = (tmp & 0xffff)? ((tmp & 0xffff) * 256): 128;
 643                         tmp >>= 16;
 644                         erase_region_count = (tmp & 0xffff) +1;
 645                         for(j = 0; j< erase_region_count; j++) {
 646                                 info->start[sect_cnt] = sector;
 647                                 sector += (erase_region_size * size_ratio);
 648                                 info->protect[sect_cnt] = flash_isset(info, sect_cnt, FLASH_OFFSET_PROTECT, FLASH_STATUS_PROTECT);
 649                                 sect_cnt++;
 650                         }
 651                 }
 652
 653                 info->sector_count = sect_cnt;
 654                 /* multiply the size by the number of chips */
 655                 info->size = (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) * size_ratio;
 656                 info->buffer_size = (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
 657                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
 658                 info->erase_blk_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
 659                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
 660                 info->buffer_write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
 661                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
 662                 info->write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT)))/ 1000;
 663                 info->flash_id = FLASH_MAN_CFI;
 664         }
 665
 666         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 667         return(info->size);
 668 }
 669
 670
 671 /*-----------------------------------------------------------------------
 672  */
 673 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword)
 674 {
 675
 676         cfiptr_t ctladdr;
 677         cfiptr_t cptr;
 678         int flag;
 679
 680         ctladdr.cp = flash_make_addr(info, 0, 0);
 681         cptr.cp = (uchar *)dest;
 682
 683
 684         /* Check if Flash is (sufficiently) erased */
 685         switch(info->portwidth) {
 686         case FLASH_CFI_8BIT:
 687                 flag = ((cptr.cp[0] & cword.c) == cword.c);
 688                 break;
 689         case FLASH_CFI_16BIT:
 690                 flag = ((cptr.wp[0] & cword.w) == cword.w);
 691                 break;
 692         case FLASH_CFI_32BIT:
 693                 flag = ((cptr.lp[0] & cword.l)  == cword.l);
 694                 break;
 695         default:
 696                 return 2;
 697         }
 698         if(!flag)
 699                 return 2;
 700
 701         /* Disable interrupts which might cause a timeout here */
 702         flag = disable_interrupts();
 703
 704         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
 705         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
 706
 707         switch(info->portwidth) {
 708         case FLASH_CFI_8BIT:
 709                 cptr.cp[0] = cword.c;
 710                 break;
 711         case FLASH_CFI_16BIT:
 712                 cptr.wp[0] = cword.w;
 713                 break;
 714         case FLASH_CFI_32BIT:
 715                 cptr.lp[0] = cword.l;
 716                 break;
 717         }
 718
 719         /* re-enable interrupts if necessary */
 720         if(flag)
 721                 enable_interrupts();
 722
 723         return flash_full_status_check(info, 0, info->write_tout, "write");
 724 }
 725
 726 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 727
 728 /* loop through the sectors from the highest address
 729  * when the passed address is greater or equal to the sector address
 730  * we have a match
 731  */
 732 static int find_sector(flash_info_t *info, ulong addr)
 733 {
 734         int sector;
 735         for(sector = info->sector_count - 1; sector >= 0; sector--) {
 736                 if(addr >= info->start[sector])
 737                         break;
 738         }
 739         return sector;
 740 }
 741
 742 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len)
 743 {
 744
 745         int sector;
 746         int cnt;
 747         int retcode;
 748         volatile cfiptr_t src;
 749         volatile cfiptr_t dst;
 750
 751         src.cp = cp;
 752         dst.cp = (uchar *)dest;
 753         sector = find_sector(info, dest);
 754         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 755         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
 756         if((retcode = flash_status_check(info, sector, info->buffer_write_tout,
 757                                          "write to buffer")) == ERR_OK) {
 758                 switch(info->portwidth) {
 759                 case FLASH_CFI_8BIT:
 760                         cnt = len;
 761                         break;
 762                 case FLASH_CFI_16BIT:
 763                         cnt = len >> 1;
 764                         break;
 765                 case FLASH_CFI_32BIT:
 766                         cnt = len >> 2;
 767                         break;
 768                 default:
 769                         return ERR_INVAL;
 770                         break;
 771                 }
 772                 flash_write_cmd(info, sector, 0, (uchar)cnt-1);
 773                 while(cnt-- > 0) {
 774                         switch(info->portwidth) {
 775                         case FLASH_CFI_8BIT:
 776                                 *dst.cp++ = *src.cp++;
 777                                 break;
 778                         case FLASH_CFI_16BIT:
 779                                 *dst.wp++ = *src.wp++;
 780                                 break;
 781                         case FLASH_CFI_32BIT:
 782                                 *dst.lp++ = *src.lp++;
 783                                 break;
 784                         default:
 785                                 return ERR_INVAL;
 786                                 break;
 787                         }
 788                 }
 789                 flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_BUFFER_CONFIRM);
 790                 retcode = flash_full_status_check(info, sector, info->buffer_write_tout,
 791                                              "buffer write");
 792         }
 793         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 794         return retcode;
 795 }
 796 #endif /* CFG_USE_FLASH_BUFFER_WRITE */