board/sbc405/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 typedef union {
  93         unsigned char c;
  94         unsigned short w;
  95         unsigned long l;
  96 } cfiword_t;
  97
  98 typedef union {
  99         unsigned char * cp;
 100         unsigned short *wp;
 101         unsigned long *lp;
 102 } cfiptr_t;
 103
 104 #define NUM_ERASE_REGIONS 4
 105
 106 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
 107
 108
 109 /*-----------------------------------------------------------------------
 110  * Functions
 111  */
 112
 113
 114 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c);
 115 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf);
 116 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd);
 117 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd);
 118 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);
 119 static int flash_detect_cfi(flash_info_t * info);
 120 static ulong flash_get_size (ulong base, int banknum);
 121 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword);
 122 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt);
 123 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 124 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len);
 125 #endif
 126 /*-----------------------------------------------------------------------
 127  * create an address based on the offset and the port width
 128  */
 129 inline uchar * flash_make_addr(flash_info_t * info, int sect, int offset)
 130 {
 131         return ((uchar *)(info->start[sect] + (offset * info->portwidth)));
 132 }
 133 /*-----------------------------------------------------------------------
 134  * read a character at a port width address
 135  */
 136 inline uchar flash_read_uchar(flash_info_t * info, uchar offset)
 137 {
 138         uchar *cp;
 139         cp = flash_make_addr(info, 0, offset);
 140         return (cp[info->portwidth - 1]);
 141 }
 142
 143 /*-----------------------------------------------------------------------
 144  * read a short word by swapping for ppc format.
 145  */
 146 ushort flash_read_ushort(flash_info_t * info, int sect,  uchar offset)
 147 {
 148     uchar * addr;
 149
 150     addr = flash_make_addr(info, sect, offset);
 151     return ((addr[(2*info->portwidth) - 1] << 8) | addr[info->portwidth - 1]);
 152
 153 }
 154
 155 /*-----------------------------------------------------------------------
 156  * read a long word by picking the least significant byte of each maiximum
 157  * port size word. Swap for ppc format.
 158  */
 159 ulong flash_read_long(flash_info_t * info, int sect,  uchar offset)
 160 {
 161     uchar * addr;
 162
 163     addr = flash_make_addr(info, sect, offset);
 164     return ( (addr[(2*info->portwidth) - 1] << 24 ) | (addr[(info->portwidth) -1] << 16) |
 165             (addr[(4*info->portwidth) - 1] << 8) | addr[(3*info->portwidth) - 1]);
 166
 167 }
 168
 169 /*-----------------------------------------------------------------------
 170  */
 171 unsigned long flash_init (void)
 172 {
 173         unsigned long size;
 174         int i;
 175         unsigned long  address;
 176
 177
 178         /* The flash is positioned back to back, with the demultiplexing of the chip
 179          * based on the A24 address line.
 180          *
 181          */
 182
 183         address = CONFIG_SYS_FLASH_BASE;
 184         size = 0;
 185
 186         /* Init: no FLASHes known */
 187         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 188                 flash_info[i].flash_id = FLASH_UNKNOWN;
 189                 size += flash_info[i].size = flash_get_size(address, i);
 190                 address += CONFIG_SYS_FLASH_INCREMENT;
 191                 if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 192                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",i,
 193                                 flash_info[0].size, flash_info[i].size<<20);
 194                 }
 195         }
 196
 197 #if 0 /* test-only */
 198         /* Monitor protection ON by default */
 199 #if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE)
 200         for(i=0; flash_info[0].start[i] < CONFIG_SYS_MONITOR_BASE+CONFIG_SYS_MONITOR_LEN-1; i++)
 201                 (void)flash_real_protect(&flash_info[0], i, 1);
 202 #endif
 203 #else
 204         /* monitor protection ON by default */
 205         flash_protect (FLAG_PROTECT_SET,
 206                        - CONFIG_SYS_MONITOR_LEN,
 207                        - 1, &flash_info[1]);
 208 #endif
 209
 210         return (size);
 211 }
 212
 213 /*-----------------------------------------------------------------------
 214  */
 215 int flash_erase (flash_info_t *info, int s_first, int s_last)
 216 {
 217         int rcode = 0;
 218         int prot;
 219         int sect;
 220
 221         if( info->flash_id != FLASH_MAN_CFI) {
 222                 printf ("Can't erase unknown flash type - aborted\n");
 223                 return 1;
 224         }
 225         if ((s_first < 0) || (s_first > s_last)) {
 226                 printf ("- no sectors to erase\n");
 227                 return 1;
 228         }
 229
 230         prot = 0;
 231         for (sect=s_first; sect<=s_last; ++sect) {
 232                 if (info->protect[sect]) {
 233                         prot++;
 234                 }
 235         }
 236         if (prot) {
 237                 printf ("- Warning: %d protected sectors will not be erased!\n",
 238                         prot);
 239         } else {
 240                 printf ("\n");
 241         }
 242
 243
 244         for (sect = s_first; sect<=s_last; sect++) {
 245                 if (info->protect[sect] == 0) { /* not protected */
 246                         flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);
 247                         flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);
 248                         flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);
 249
 250                         if(flash_full_status_check(info, sect, info->erase_blk_tout, "erase")) {
 251                                 rcode = 1;
 252                         } else
 253                                 printf(".");
 254                 }
 255         }
 256         printf (" done\n");
 257         return rcode;
 258 }
 259
 260 /*-----------------------------------------------------------------------
 261  */
 262 void flash_print_info  (flash_info_t *info)
 263 {
 264         int i;
 265
 266         if (info->flash_id != FLASH_MAN_CFI) {
 267                 printf ("missing or unknown FLASH type\n");
 268                 return;
 269         }
 270
 271         printf("CFI conformant FLASH (%d x %d)",
 272                (info->portwidth  << 3 ), (info->chipwidth  << 3 ));
 273         printf ("  Size: %ld MB in %d Sectors\n",
 274                 info->size >> 20, info->sector_count);
 275         printf(" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",
 276                info->erase_blk_tout, info->write_tout, info->buffer_write_tout, info->buffer_size);
 277
 278         printf ("  Sector Start Addresses:");
 279         for (i=0; i<info->sector_count; ++i) {
 280 #ifdef CONFIG_SYS_FLASH_EMPTY_INFO
 281                 int k;
 282                 int size;
 283                 int erased;
 284                 volatile unsigned long *flash;
 285
 286                 /*
 287                  * Check if whole sector is erased
 288                  */
 289                 if (i != (info->sector_count-1))
 290                   size = info->start[i+1] - info->start[i];
 291                 else
 292                   size = info->start[0] + info->size - info->start[i];
 293                 erased = 1;
 294                 flash = (volatile unsigned long *)info->start[i];
 295                 size = size >> 2;        /* divide by 4 for longword access */
 296                 for (k=0; k<size; k++)
 297                   {
 298                     if (*flash++ != 0xffffffff)
 299                       {
 300                         erased = 0;
 301                         break;
 302                       }
 303                   }
 304
 305                 if ((i % 5) == 0)
 306                         printf ("\n   ");
 307                 /* print empty and read-only info */
 308                 printf (" %08lX%s%s",
 309                         info->start[i],
 310                         erased ? " E" : "  ",
 311                         info->protect[i] ? "RO " : "   ");
 312 #else
 313                 if ((i % 5) == 0)
 314                         printf ("\n   ");
 315                 printf (" %08lX%s",
 316                         info->start[i],
 317                         info->protect[i] ? " (RO)" : "     ");
 318 #endif
 319         }
 320         printf ("\n");
 321         return;
 322 }
 323
 324 /*-----------------------------------------------------------------------
 325  * Copy memory to flash, returns:
 326  * 0 - OK
 327  * 1 - write timeout
 328  * 2 - Flash not erased
 329  */
 330 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 331 {
 332         ulong wp;
 333         ulong cp;
 334         int aln;
 335         cfiword_t cword;
 336         int i, rc;
 337
 338         /* get lower aligned address */
 339         wp = (addr & ~(info->portwidth - 1));
 340
 341         /* handle unaligned start */
 342         if((aln = addr - wp) != 0) {
 343                 cword.l = 0;
 344                 cp = wp;
 345                 for(i=0;i<aln; ++i, ++cp)
 346                         flash_add_byte(info, &cword, (*(uchar *)cp));
 347
 348                 for(; (i< info->portwidth) && (cnt > 0) ; i++) {
 349                         flash_add_byte(info, &cword, *src++);
 350                         cnt--;
 351                         cp++;
 352                 }
 353                 for(; (cnt == 0) && (i < info->portwidth); ++i, ++cp)
 354                         flash_add_byte(info, &cword, (*(uchar *)cp));
 355                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 356                         return rc;
 357                 wp = cp;
 358         }
 359
 360 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 361         while(cnt >= info->portwidth) {
 362                 i = info->buffer_size > cnt? cnt: info->buffer_size;
 363                 if((rc = flash_write_cfibuffer(info, wp, src,i)) != ERR_OK)
 364                         return rc;
 365                 wp += i;
 366                 src += i;
 367                 cnt -=i;
 368         }
 369 #else
 370         /* handle the aligned part */
 371         while(cnt >= info->portwidth) {
 372                 cword.l = 0;
 373                 for(i = 0; i < info->portwidth; i++) {
 374                         flash_add_byte(info, &cword, *src++);
 375                 }
 376                 if((rc = flash_write_cfiword(info, wp, cword)) != 0)
 377                         return rc;
 378                 wp += info->portwidth;
 379                 cnt -= info->portwidth;
 380         }
 381 #endif /* CONFIG_SYS_FLASH_USE_BUFFER_WRITE */
 382         if (cnt == 0) {
 383                 return (0);
 384         }
 385
 386         /*
 387          * handle unaligned tail bytes
 388          */
 389         cword.l = 0;
 390         for (i=0, cp=wp; (i<info->portwidth) && (cnt>0); ++i, ++cp) {
 391                 flash_add_byte(info, &cword, *src++);
 392                 --cnt;
 393         }
 394         for (; i<info->portwidth; ++i, ++cp) {
 395                 flash_add_byte(info, & cword, (*(uchar *)cp));
 396         }
 397
 398         return flash_write_cfiword(info, wp, cword);
 399 }
 400
 401 /*-----------------------------------------------------------------------
 402  */
 403 int flash_real_protect(flash_info_t *info, long sector, int prot)
 404 {
 405         int retcode = 0;
 406
 407         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 408         flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);
 409         if(prot)
 410                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);
 411         else
 412                 flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);
 413
 414         if((retcode = flash_full_status_check(info, sector, info->erase_blk_tout,
 415                                          prot?"protect":"unprotect")) == 0) {
 416
 417                 info->protect[sector] = prot;
 418                 /* Intel's unprotect unprotects all locking */
 419                 if(prot == 0) {
 420                         int i;
 421                         for(i = 0 ; i<info->sector_count; i++) {
 422                                 if(info->protect[i])
 423                                         flash_real_protect(info, i, 1);
 424                         }
 425                 }
 426         }
 427
 428         return retcode;
 429 }
 430 /*-----------------------------------------------------------------------
 431  *  wait for XSR.7 to be set. Time out with an error if it does not.
 432  *  This routine does not set the flash to read-array mode.
 433  */
 434 static int flash_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 435 {
 436         ulong start;
 437
 438         /* Wait for command completion */
 439         start = get_timer (0);
 440         while(!flash_isset(info, sector, 0, FLASH_STATUS_DONE)) {
 441                 if (get_timer(start) > info->erase_blk_tout) {
 442                         printf("Flash %s timeout at address %lx\n", prompt, info->start[sector]);
 443                         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 444                         return ERR_TIMOUT;
 445                 }
 446         }
 447         return ERR_OK;
 448 }
 449 /*-----------------------------------------------------------------------
 450  * Wait for XSR.7 to be set, if it times out print an error, otherwise do a full status check.
 451  * This routine sets the flash to read-array mode.
 452  */
 453 static int flash_full_status_check(flash_info_t * info, ulong sector, ulong tout, char * prompt)
 454 {
 455         int retcode;
 456         retcode = flash_status_check(info, sector, tout, prompt);
 457         if((retcode == ERR_OK) && !flash_isequal(info,sector, 0, FLASH_STATUS_DONE)) {
 458                 retcode = ERR_INVAL;
 459                 printf("Flash %s error at address %lx\n", prompt,info->start[sector]);
 460                 if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS | FLASH_STATUS_PSLBS)){
 461                         printf("Command Sequence Error.\n");
 462                 } else if(flash_isset(info, sector, 0, FLASH_STATUS_ECLBS)){
 463                         printf("Block Erase Error.\n");
 464                         retcode = ERR_NOT_ERASED;
 465                 } else if (flash_isset(info, sector, 0, FLASH_STATUS_PSLBS)) {
 466                         printf("Locking Error\n");
 467                 }
 468                 if(flash_isset(info, sector, 0, FLASH_STATUS_DPS)){
 469                         printf("Block locked.\n");
 470                         retcode = ERR_PROTECTED;
 471                 }
 472                 if(flash_isset(info, sector, 0, FLASH_STATUS_VPENS))
 473                         printf("Vpp Low Error.\n");
 474         }
 475         flash_write_cmd(info, sector, 0, FLASH_CMD_RESET);
 476         return retcode;
 477 }
 478 /*-----------------------------------------------------------------------
 479  */
 480 static void flash_add_byte(flash_info_t *info, cfiword_t * cword, uchar c)
 481 {
 482         switch(info->portwidth) {
 483         case FLASH_CFI_8BIT:
 484                 cword->c = c;
 485                 break;
 486         case FLASH_CFI_16BIT:
 487                 cword->w = (cword->w << 8) | c;
 488                 break;
 489         case FLASH_CFI_32BIT:
 490                 cword->l = (cword->l << 8) | c;
 491         }
 492 }
 493
 494
 495 /*-----------------------------------------------------------------------
 496  * make a proper sized command based on the port and chip widths
 497  */
 498 static void flash_make_cmd(flash_info_t * info, uchar cmd, void * cmdbuf)
 499 {
 500         int i;
 501         uchar *cp = (uchar *)cmdbuf;
 502         for(i=0; i< info->portwidth; i++)
 503                 *cp++ = ((i+1) % info->chipwidth) ? '\0':cmd;
 504 }
 505
 506 /*
 507  * Write a proper sized command to the correct address
 508  */
 509 static void flash_write_cmd(flash_info_t * info, int sect, uchar offset, uchar cmd)
 510 {
 511
 512         volatile cfiptr_t addr;
 513         cfiword_t cword;
 514         addr.cp = flash_make_addr(info, sect, offset);
 515         flash_make_cmd(info, cmd, &cword);
 516         switch(info->portwidth) {
 517         case FLASH_CFI_8BIT:
 518                 *addr.cp = cword.c;
 519                 break;
 520         case FLASH_CFI_16BIT:
 521                 *addr.wp = cword.w;
 522                 break;
 523         case FLASH_CFI_32BIT:
 524                 *addr.lp = cword.l;
 525                 break;
 526         }
 527 }
 528
 529 /*-----------------------------------------------------------------------
 530  */
 531 static int flash_isequal(flash_info_t * info, int sect, uchar offset, uchar cmd)
 532 {
 533         cfiptr_t cptr;
 534         cfiword_t cword;
 535         int retval;
 536         cptr.cp = flash_make_addr(info, sect, offset);
 537         flash_make_cmd(info, cmd, &cword);
 538         switch(info->portwidth) {
 539         case FLASH_CFI_8BIT:
 540                 retval = (cptr.cp[0] == cword.c);
 541                 break;
 542         case FLASH_CFI_16BIT:
 543                 retval = (cptr.wp[0] == cword.w);
 544                 break;
 545         case FLASH_CFI_32BIT:
 546                 retval = (cptr.lp[0] == cword.l);
 547                 break;
 548         default:
 549                 retval = 0;
 550                 break;
 551         }
 552         return retval;
 553 }
 554 /*-----------------------------------------------------------------------
 555  */
 556 static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd)
 557 {
 558         cfiptr_t cptr;
 559         cfiword_t cword;
 560         int retval;
 561         cptr.cp = flash_make_addr(info, sect, offset);
 562         flash_make_cmd(info, cmd, &cword);
 563         switch(info->portwidth) {
 564         case FLASH_CFI_8BIT:
 565                 retval = ((cptr.cp[0] & cword.c) == cword.c);
 566                 break;
 567         case FLASH_CFI_16BIT:
 568                 retval = ((cptr.wp[0] & cword.w) == cword.w);
 569                 break;
 570         case FLASH_CFI_32BIT:
 571                 retval = ((cptr.lp[0] & cword.l) == cword.l);
 572                 break;
 573         default:
 574                 retval = 0;
 575                 break;
 576         }
 577         return retval;
 578 }
 579
 580 /*-----------------------------------------------------------------------
 581  * detect if flash is compatible with the Common Flash Interface (CFI)
 582  * http://www.jedec.org/download/search/jesd68.pdf
 583  *
 584 */
 585 static int flash_detect_cfi(flash_info_t * info)
 586 {
 587
 588         for(info->portwidth=FLASH_CFI_8BIT; info->portwidth <= FLASH_CFI_32BIT;
 589             info->portwidth <<= 1) {
 590                 for(info->chipwidth =FLASH_CFI_BY8;
 591                     info->chipwidth <= info->portwidth;
 592                     info->chipwidth <<= 1) {
 593                         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 594                         flash_write_cmd(info, 0, FLASH_OFFSET_CFI, FLASH_CMD_CFI);
 595                         if(flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP,'Q') &&
 596                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 1, 'R') &&
 597                            flash_isequal(info, 0, FLASH_OFFSET_CFI_RESP + 2, 'Y'))
 598                                 return 1;
 599                 }
 600         }
 601         return 0;
 602 }
 603 /*
 604  * The following code cannot be run from FLASH!
 605  *
 606  */
 607 static ulong flash_get_size (ulong base, int banknum)
 608 {
 609         flash_info_t * info = &flash_info[banknum];
 610         int i, j;
 611         int sect_cnt;
 612         unsigned long sector;
 613         unsigned long tmp;
 614         int size_ratio;
 615         uchar num_erase_regions;
 616         int  erase_region_size;
 617         int  erase_region_count;
 618
 619         info->start[0] = base;
 620
 621         if(flash_detect_cfi(info)){
 622 #ifdef DEBUG_FLASH
 623                 printf("portwidth=%d chipwidth=%d\n", info->portwidth, info->chipwidth); /* test-only */
 624 #endif
 625                 size_ratio = info->portwidth / info->chipwidth;
 626                 num_erase_regions = flash_read_uchar(info, FLASH_OFFSET_NUM_ERASE_REGIONS);
 627 #ifdef DEBUG_FLASH
 628                 printf("found %d erase regions\n", num_erase_regions);
 629 #endif
 630                 sect_cnt = 0;
 631                 sector = base;
 632                 for(i = 0 ; i < num_erase_regions; i++) {
 633                         if(i > NUM_ERASE_REGIONS) {
 634                                 printf("%d erase regions found, only %d used\n",
 635                                        num_erase_regions, NUM_ERASE_REGIONS);
 636                                 break;
 637                         }
 638                         tmp = flash_read_long(info, 0, FLASH_OFFSET_ERASE_REGIONS);
 639                         erase_region_size = (tmp & 0xffff)? ((tmp & 0xffff) * 256): 128;
 640                         tmp >>= 16;
 641                         erase_region_count = (tmp & 0xffff) +1;
 642                         for(j = 0; j< erase_region_count; j++) {
 643                                 info->start[sect_cnt] = sector;
 644                                 sector += (erase_region_size * size_ratio);
 645                                 info->protect[sect_cnt] = flash_isset(info, sect_cnt, FLASH_OFFSET_PROTECT, FLASH_STATUS_PROTECT);
 646                                 sect_cnt++;
 647                         }
 648                 }
 649
 650                 info->sector_count = sect_cnt;
 651                 /* multiply the size by the number of chips */
 652                 info->size = (1 << flash_read_uchar(info, FLASH_OFFSET_SIZE)) * size_ratio;
 653                 info->buffer_size = (1 << flash_read_ushort(info, 0, FLASH_OFFSET_BUFFER_SIZE));
 654                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_ETOUT);
 655                 info->erase_blk_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_EMAX_TOUT)));
 656                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WBTOUT);
 657                 info->buffer_write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WBMAX_TOUT)));
 658                 tmp = 1 << flash_read_uchar(info, FLASH_OFFSET_WTOUT);
 659                 info->write_tout = (tmp * (1 << flash_read_uchar(info, FLASH_OFFSET_WMAX_TOUT)))/ 1000;
 660                 info->flash_id = FLASH_MAN_CFI;
 661         }
 662
 663         flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 664         return(info->size);
 665 }
 666
 667
 668 /*-----------------------------------------------------------------------
 669  */
 670 static int flash_write_cfiword (flash_info_t *info, ulong dest, cfiword_t cword)
 671 {
 672
 673         cfiptr_t cptr;
 674         int flag;
 675
 676         cptr.cp = (uchar *)dest;
 677
 678         /* Check if Flash is (sufficiently) erased */
 679         switch(info->portwidth) {
 680         case FLASH_CFI_8BIT:
 681                 flag = ((cptr.cp[0] & cword.c) == cword.c);
 682                 break;
 683         case FLASH_CFI_16BIT:
 684                 flag = ((cptr.wp[0] & cword.w) == cword.w);
 685                 break;
 686         case FLASH_CFI_32BIT:
 687                 flag = ((cptr.lp[0] & cword.l)  == cword.l);
 688                 break;
 689         default:
 690                 return 2;
 691         }
 692         if(!flag)
 693                 return 2;
 694
 695         /* Disable interrupts which might cause a timeout here */
 696         flag = disable_interrupts();
 697
 698         flash_write_cmd(info, 0, 0, FLASH_CMD_CLEAR_STATUS);
 699         flash_write_cmd(info, 0, 0, FLASH_CMD_WRITE);
 700
 701         switch(info->portwidth) {
 702         case FLASH_CFI_8BIT:
 703                 cptr.cp[0] = cword.c;
 704                 break;
 705         case FLASH_CFI_16BIT:
 706                 cptr.wp[0] = cword.w;
 707                 break;
 708         case FLASH_CFI_32BIT:
 709                 cptr.lp[0] = cword.l;
 710                 break;
 711         }
 712
 713         /* re-enable interrupts if necessary */
 714         if(flag)
 715                 enable_interrupts();
 716
 717         return flash_full_status_check(info, 0, info->write_tout, "write");
 718 }
 719
 720 #ifdef CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 721
 722 /* loop through the sectors from the highest address
 723  * when the passed address is greater or equal to the sector address
 724  * we have a match
 725  */
 726 static int find_sector(flash_info_t *info, ulong addr)
 727 {
 728         int sector;
 729         for(sector = info->sector_count - 1; sector >= 0; sector--) {
 730                 if(addr >= info->start[sector])
 731                         break;
 732         }
 733         return sector;
 734 }
 735
 736 static int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp, int len)
 737 {
 738
 739         int sector;
 740         int cnt;
 741         int retcode;
 742         volatile cfiptr_t src;
 743         volatile cfiptr_t dst;
 744
 745         src.cp = cp;
 746         dst.cp = (uchar *)dest;
 747         sector = find_sector(info, dest);
 748         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 749         flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_TO_BUFFER);
 750         if((retcode = flash_status_check(info, sector, info->buffer_write_tout,
 751                                          "write to buffer")) == ERR_OK) {
 752                 switch(info->portwidth) {
 753                 case FLASH_CFI_8BIT:
 754                         cnt = len;
 755                         break;
 756                 case FLASH_CFI_16BIT:
 757                         cnt = len >> 1;
 758                         break;
 759                 case FLASH_CFI_32BIT:
 760                         cnt = len >> 2;
 761                         break;
 762                 default:
 763                         return ERR_INVAL;
 764                         break;
 765                 }
 766                 flash_write_cmd(info, sector, 0, (uchar)cnt-1);
 767                 while(cnt-- > 0) {
 768                         switch(info->portwidth) {
 769                         case FLASH_CFI_8BIT:
 770                                 *dst.cp++ = *src.cp++;
 771                                 break;
 772                         case FLASH_CFI_16BIT:
 773                                 *dst.wp++ = *src.wp++;
 774                                 break;
 775                         case FLASH_CFI_32BIT:
 776                                 *dst.lp++ = *src.lp++;
 777                                 break;
 778                         default:
 779                                 return ERR_INVAL;
 780                                 break;
 781                         }
 782                 }
 783                 flash_write_cmd(info, sector, 0, FLASH_CMD_WRITE_BUFFER_CONFIRM);
 784                 retcode = flash_full_status_check(info, sector, info->buffer_write_tout,
 785                                              "buffer write");
 786         }
 787         flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);
 788         return retcode;
 789 }
 790 #endif /* CONFIG_SYS_USE_FLASH_BUFFER_WRITE */