board/evb64260/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
   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 /*
  25  * flash.c - flash support for the 512k, 8bit boot flash on the GEVB
  26  *           most of this file was based on the existing U-Boot
  27  *           flash drivers.
  28  */
  29
  30 #include <common.h>
  31 #include <mpc8xx.h>
  32 #include <galileo/gt64260R.h>
  33 #include <galileo/memory.h>
  34 #include "intel_flash.h"
  35
  36 #define FLASH_ROM       0xFFFD       /* unknown flash type                   */
  37 #define FLASH_RAM       0xFFFE       /* unknown flash type                   */
  38 #define FLASH_MAN_UNKNOWN 0xFFFF0000
  39
  40 /* #define DEBUG */
  41 /* #define FLASH_ID_OVERRIDE */ /* Hack to set type to 040B if ROM emulator is installed.
  42                                  * Can be used to program a ROM in circuit if a programmer
  43                                  * is not available by swapping the rom out. */
  44
  45 /* Intel flash commands */
  46 int flash_erase_intel(flash_info_t *info, int s_first, int s_last);
  47 int write_word_intel(bank_addr_t addr, bank_word_t value);
  48
  49 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
  50
  51 /*-----------------------------------------------------------------------
  52  * Functions
  53  */
  54 static ulong flash_get_size (int portwidth, vu_long *addr, flash_info_t *info);
  55 static int write_word (flash_info_t *info, ulong dest, ulong data);
  56 static void flash_get_offsets (ulong base, flash_info_t *info);
  57
  58 /*-----------------------------------------------------------------------
  59  */
  60
  61 unsigned long
  62 flash_init (void)
  63 {
  64         unsigned int i;
  65         unsigned long size_b0 = 0, size_b1 = 0;
  66         unsigned long base, flash_size;
  67
  68         /* Init: no FLASHes known */
  69         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  70                 flash_info[i].flash_id = FLASH_UNKNOWN;
  71         }
  72
  73         /* the boot flash */
  74         base = CFG_FLASH_BASE;
  75         size_b0 = flash_get_size(1, (vu_long *)base, &flash_info[0]);
  76
  77         printf("[%ldkB@%lx] ", size_b0/1024, base);
  78
  79         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  80                 printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
  81                         base, size_b0, size_b0<<20);
  82         }
  83
  84         base = memoryGetDeviceBaseAddress(CFG_EXTRA_FLASH_DEVICE);
  85         for(i=1;i<CFG_MAX_FLASH_BANKS;i++) {
  86             unsigned long size = flash_get_size(CFG_EXTRA_FLASH_WIDTH, (vu_long *)base, &flash_info[i]);
  87
  88             printf("[%ldMB@%lx] ", size>>20, base);
  89
  90             if (flash_info[i].flash_id == FLASH_UNKNOWN) {
  91                 if(i==1) {
  92                     printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
  93                             base, size_b1, size_b1<<20);
  94                 }
  95                 break;
  96             }
  97             size_b1+=size;
  98             base+=size;
  99         }
 100
 101         flash_size = size_b0 + size_b1;
 102         return flash_size;
 103 }
 104
 105 /*-----------------------------------------------------------------------
 106  */
 107 static void
 108 flash_get_offsets (ulong base, flash_info_t *info)
 109 {
 110         int i;
 111         int sector_size;
 112
 113         if(!info->sector_count) return;
 114
 115         /* set up sector start address table */
 116         switch(info->flash_id & FLASH_TYPEMASK) {
 117             case FLASH_AM040:
 118             case FLASH_28F128J3A:
 119             case FLASH_28F640J3A:
 120             case FLASH_RAM:
 121                 /* this chip has uniformly spaced sectors */
 122                 sector_size=info->size/info->sector_count;
 123                 for (i = 0; i < info->sector_count; i++)
 124                         info->start[i] = base + (i * sector_size);
 125                 break;
 126             default:
 127                 if (info->flash_id & FLASH_BTYPE) {
 128                     /* set sector offsets for bottom boot block type    */
 129                     info->start[0] = base + 0x00000000;
 130                     info->start[1] = base + 0x00008000;
 131                     info->start[2] = base + 0x0000C000;
 132                     info->start[3] = base + 0x00010000;
 133                     for (i = 4; i < info->sector_count; i++) {
 134                             info->start[i] = base + (i * 0x00020000) - 0x00060000;
 135                     }
 136                 } else {
 137                     /* set sector offsets for top boot block type               */
 138                     i = info->sector_count - 1;
 139                     info->start[i--] = base + info->size - 0x00008000;
 140                     info->start[i--] = base + info->size - 0x0000C000;
 141                     info->start[i--] = base + info->size - 0x00010000;
 142                     for (; i >= 0; i--) {
 143                             info->start[i] = base + i * 0x00020000;
 144                     }
 145                 }
 146         }
 147 }
 148
 149 /*-----------------------------------------------------------------------
 150  */
 151 void
 152 flash_print_info  (flash_info_t *info)
 153 {
 154         int i;
 155
 156         if (info->flash_id == FLASH_UNKNOWN) {
 157                 printf ("missing or unknown FLASH type\n");
 158                 return;
 159         }
 160
 161         switch (info->flash_id & FLASH_VENDMASK) {
 162         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 163         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 164         case FLASH_MAN_INTEL:   printf ("INTEL ");              break;
 165         default:                printf ("Unknown Vendor ");     break;
 166         }
 167
 168         switch (info->flash_id & FLASH_TYPEMASK) {
 169         case FLASH_AM040:
 170                 printf ("AM29LV040B (4 Mbit, bottom boot sect)\n");
 171                 break;
 172         case FLASH_AM400B:
 173                 printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 174                 break;
 175         case FLASH_AM400T:
 176                 printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 177                 break;
 178         case FLASH_AM800B:
 179                 printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 180                 break;
 181         case FLASH_AM800T:
 182                 printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 183                 break;
 184         case FLASH_AM160B:
 185                 printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 186                 break;
 187         case FLASH_AM160T:
 188                 printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 189                 break;
 190         case FLASH_AM320B:
 191                 printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 192                 break;
 193         case FLASH_AM320T:
 194                 printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 195                 break;
 196         case FLASH_28F640J3A:
 197                 printf ("28F640J3A (64 Mbit)\n");
 198                 break;
 199         case FLASH_28F128J3A:
 200                 printf ("28F128J3A (128 Mbit)\n");
 201                 break;
 202         case FLASH_ROM:
 203                 printf ("ROM\n");
 204                 break;
 205         case FLASH_RAM:
 206                 printf ("RAM\n");
 207                 break;
 208         default:
 209                 printf ("Unknown Chip Type\n");
 210                 break;
 211         }
 212
 213         puts ("  Size: ");
 214         print_size (info->size, "");
 215         printf (" in %d Sectors\n", info->sector_count);
 216
 217         printf ("  Sector Start Addresses:");
 218         for (i=0; i<info->sector_count; ++i) {
 219                 if ((i % 5) == 0)
 220                         printf ("\n   ");
 221                 printf (" %08lX%s",
 222                         info->start[i],
 223                         info->protect[i] ? " (RO)" : "     "
 224                 );
 225         }
 226         printf ("\n");
 227         return;
 228 }
 229
 230 /*-----------------------------------------------------------------------
 231  */
 232
 233
 234 /*-----------------------------------------------------------------------
 235  */
 236
 237 /*
 238  * The following code cannot be run from FLASH!
 239  */
 240
 241 static inline void flash_cmd(int width, volatile unsigned char *addr, int offset, unsigned char cmd)
 242 {
 243         /* supports 1x8, 1x16, and 2x16 */
 244         /* 2x8 and 4x8 are not supported */
 245         if(width==4) {
 246             /* assuming chips are in 16 bit mode */
 247             /* 2x16 */
 248             unsigned long cmd32=(cmd<<16)|cmd;
 249             *(volatile unsigned long *)(addr+offset*2)=cmd32;
 250         } else {
 251             /* 1x16 or 1x8 */
 252             *(volatile unsigned char *)(addr+offset)=cmd;
 253         }
 254 }
 255
 256 static ulong
 257 flash_get_size (int portwidth, vu_long *addr, flash_info_t *info)
 258 {
 259         short i;
 260         volatile unsigned char *caddr = (unsigned char *)addr;
 261         volatile unsigned short *saddr = (unsigned short *)addr;
 262         volatile unsigned long *laddr = (unsigned long *)addr;
 263         char old[2], save;
 264         ulong id, manu, base = (ulong)addr;
 265
 266         info->portwidth=portwidth;
 267
 268         save = *caddr;
 269
 270         flash_cmd(portwidth,caddr,0,0xf0);
 271         flash_cmd(portwidth,caddr,0,0xf0);
 272
 273         udelay(10);
 274
 275         old[0] = caddr[0];
 276         old[1] = caddr[1];
 277
 278
 279         if(old[0]!=0xf0) {
 280             flash_cmd(portwidth,caddr,0,0xf0);
 281             flash_cmd(portwidth,caddr,0,0xf0);
 282
 283             udelay(10);
 284
 285             if(*caddr==0xf0) {
 286                 /* this area is ROM */
 287                 *caddr=save;
 288 #ifndef FLASH_ID_OVERRIDE
 289                 info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
 290                 info->sector_count = 8;
 291                 info->size = 0x80000;
 292 #else
 293                 info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
 294                 info->sector_count = 8;
 295                 info->size = 0x80000;
 296                 info->chipwidth=1;
 297 #endif
 298                 flash_get_offsets(base, info);
 299                 return info->size;
 300             }
 301         } else {
 302             *caddr=0;
 303
 304             udelay(10);
 305
 306             if(*caddr==0) {
 307                 /* this area is RAM */
 308                 *caddr=save;
 309                 info->flash_id = FLASH_RAM + FLASH_MAN_UNKNOWN;
 310                 info->sector_count = 8;
 311                 info->size = 0x80000;
 312                 flash_get_offsets(base, info);
 313                 return info->size;
 314             }
 315             flash_cmd(portwidth,caddr,0,0xf0);
 316
 317             udelay(10);
 318         }
 319
 320         /* Write auto select command: read Manufacturer ID */
 321         flash_cmd(portwidth,caddr,0x555,0xAA);
 322         flash_cmd(portwidth,caddr,0x2AA,0x55);
 323         flash_cmd(portwidth,caddr,0x555,0x90);
 324
 325         udelay(10);
 326
 327         if ((caddr[0] == old[0]) &&
 328             (caddr[1] == old[1])) {
 329
 330             /* this area is ROM */
 331 #ifndef FLASH_ID_OVERRIDE
 332             info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
 333             info->sector_count = 8;
 334             info->size = 0x80000;
 335 #else
 336                 info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
 337                 info->sector_count = 8;
 338                 info->size = 0x80000;
 339                 info->chipwidth=1;
 340 #endif
 341             flash_get_offsets(base, info);
 342             return info->size;
 343 #ifdef DEBUG
 344         } else {
 345             printf("%px%d: %02x:%02x -> %02x:%02x\n",
 346                     caddr, portwidth, old[0], old[1],
 347                     caddr[0], caddr[1]);
 348 #endif
 349         }
 350
 351         switch(portwidth) {
 352             case 1:
 353                 manu = caddr[0];
 354                 manu |= manu<<16;
 355                 id = caddr[1];
 356                 break;
 357             case 2:
 358                 manu = saddr[0];
 359                 manu |= manu<<16;
 360                 id = saddr[1];
 361                 id |= id<<16;
 362                 break;
 363             case 4:
 364                 manu = laddr[0];
 365                 id = laddr[1];
 366                 break;
 367         default:
 368                 id = manu = -1;
 369                 break;
 370         }
 371
 372 #ifdef DEBUG
 373         printf("\n%08lx:%08lx:%08lx\n", base, manu, id);
 374         printf("%08lx %08lx %08lx %08lx\n",
 375                 laddr[0],laddr[1],laddr[2],laddr[3]);
 376 #endif
 377
 378         switch (manu) {
 379             case AMD_MANUFACT:
 380                     info->flash_id = FLASH_MAN_AMD;
 381                     break;
 382             case FUJ_MANUFACT:
 383                     info->flash_id = FLASH_MAN_FUJ;
 384                     break;
 385             case INTEL_MANUFACT:
 386                     info->flash_id = FLASH_MAN_INTEL;
 387                     break;
 388             default:
 389                     printf("Unknown Mfr [%08lx]:%08lx\n", manu, id);
 390                     info->flash_id = FLASH_UNKNOWN;
 391                     info->sector_count = 0;
 392                     info->size = 0;
 393                     return (0);                 /* no or unknown flash  */
 394         }
 395
 396         switch (id) {
 397             case AMD_ID_LV400T:
 398                     info->flash_id += FLASH_AM400T;
 399                     info->sector_count = 11;
 400                     info->size = 0x00100000;
 401                     info->chipwidth=1;
 402                     break;                              /* => 1 MB      */
 403
 404             case AMD_ID_LV400B:
 405                     info->flash_id += FLASH_AM400B;
 406                     info->sector_count = 11;
 407                     info->size = 0x00100000;
 408                     info->chipwidth=1;
 409                     break;                              /* => 1 MB      */
 410
 411             case AMD_ID_LV800T:
 412                     info->flash_id += FLASH_AM800T;
 413                     info->sector_count = 19;
 414                     info->size = 0x00200000;
 415                     info->chipwidth=1;
 416                     break;                              /* => 2 MB      */
 417
 418             case AMD_ID_LV800B:
 419                     info->flash_id += FLASH_AM800B;
 420                     info->sector_count = 19;
 421                     info->size = 0x00200000;
 422                     info->chipwidth=1;
 423                     break;                              /* => 2 MB      */
 424
 425             case AMD_ID_LV160T:
 426                     info->flash_id += FLASH_AM160T;
 427                     info->sector_count = 35;
 428                     info->size = 0x00400000;
 429                     info->chipwidth=1;
 430                     break;                              /* => 4 MB      */
 431
 432             case AMD_ID_LV160B:
 433                     info->flash_id += FLASH_AM160B;
 434                     info->sector_count = 35;
 435                     info->size = 0x00400000;
 436                     info->chipwidth=1;
 437                     break;                              /* => 4 MB      */
 438 #if 0   /* enable when device IDs are available */
 439             case AMD_ID_LV320T:
 440                     info->flash_id += FLASH_AM320T;
 441                     info->sector_count = 67;
 442                     info->size = 0x00800000;
 443                     break;                              /* => 8 MB      */
 444
 445             case AMD_ID_LV320B:
 446                     info->flash_id += FLASH_AM320B;
 447                     info->sector_count = 67;
 448                     info->size = 0x00800000;
 449                     break;                              /* => 8 MB      */
 450 #endif
 451             case AMD_ID_LV040B:
 452                     info->flash_id += FLASH_AM040;
 453                     info->sector_count = 8;
 454                     info->size = 0x80000;
 455                     info->chipwidth=1;
 456                     break;
 457
 458             case INTEL_ID_28F640J3A:
 459                     info->flash_id += FLASH_28F640J3A;
 460                     info->sector_count = 64;
 461                     info->size = 128*1024 * 64; /* 128kbytes x 64 blocks */
 462                     info->chipwidth=2;
 463                     if(portwidth==4) info->size*=2;     /* 2x16 */
 464                     break;
 465
 466             case INTEL_ID_28F128J3A:
 467                     info->flash_id += FLASH_28F128J3A;
 468                     info->sector_count = 128;
 469                     info->size = 128*1024 * 128; /* 128kbytes x 128 blocks */
 470                     info->chipwidth=2;
 471                     if(portwidth==4) info->size*=2;     /* 2x16 */
 472                     break;
 473
 474             default:
 475                     printf("Unknown id %lx:[%lx]\n", manu, id);
 476                     info->flash_id = FLASH_UNKNOWN;
 477                     info->chipwidth=1;
 478                     return (0);                 /* => no or unknown flash */
 479
 480         }
 481
 482         flash_get_offsets(base, info);
 483
 484 #if 0
 485         /* set up sector start address table */
 486         if (info->flash_id & FLASH_AM040) {
 487                 /* this chip has uniformly spaced sectors */
 488                 for (i = 0; i < info->sector_count; i++)
 489                         info->start[i] = base + (i * 0x00010000);
 490
 491         } else if (info->flash_id & FLASH_BTYPE) {
 492                 /* set sector offsets for bottom boot block type        */
 493                 info->start[0] = base + 0x00000000;
 494                 info->start[1] = base + 0x00008000;
 495                 info->start[2] = base + 0x0000C000;
 496                 info->start[3] = base + 0x00010000;
 497                 for (i = 4; i < info->sector_count; i++) {
 498                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 499                 }
 500         } else {
 501                 /* set sector offsets for top boot block type           */
 502                 i = info->sector_count - 1;
 503                 info->start[i--] = base + info->size - 0x00008000;
 504                 info->start[i--] = base + info->size - 0x0000C000;
 505                 info->start[i--] = base + info->size - 0x00010000;
 506                 for (; i >= 0; i--) {
 507                         info->start[i] = base + i * 0x00020000;
 508                 }
 509         }
 510 #endif
 511
 512         /* check for protected sectors */
 513         for (i = 0; i < info->sector_count; i++) {
 514                 /* read sector protection at sector address, (A7 .. A0)=0x02 */
 515                 /* D0 = 1 if protected */
 516                 caddr = (volatile unsigned char *)(info->start[i]);
 517                 saddr = (volatile unsigned short *)(info->start[i]);
 518                 laddr = (volatile unsigned long *)(info->start[i]);
 519                 if(portwidth==1)
 520                     info->protect[i] = caddr[2] & 1;
 521                 else if(portwidth==2)
 522                     info->protect[i] = saddr[2] & 1;
 523                 else
 524                     info->protect[i] = laddr[2] & 1;
 525         }
 526
 527         /*
 528          * Prevent writes to uninitialized FLASH.
 529          */
 530         if (info->flash_id != FLASH_UNKNOWN) {
 531                 caddr = (volatile unsigned char *)info->start[0];
 532
 533                 flash_cmd(portwidth,caddr,0,0xF0);      /* reset bank */
 534         }
 535
 536         return (info->size);
 537 }
 538
 539 /* TODO: 2x16 unsupported */
 540 int
 541 flash_erase (flash_info_t *info, int s_first, int s_last)
 542 {
 543         volatile unsigned char *addr = (char *)(info->start[0]);
 544         int flag, prot, sect, l_sect;
 545         ulong start, now, last;
 546
 547         /* TODO: 2x16 unsupported */
 548         if(info->portwidth==4) return 1;
 549
 550         if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
 551         if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
 552             for (sect = s_first; sect<=s_last; sect++) {
 553                 int sector_size=info->size/info->sector_count;
 554                 addr = (char *)(info->start[sect]);
 555                 memset((void *)addr, 0, sector_size);
 556             }
 557             return 0;
 558         }
 559
 560         if ((s_first < 0) || (s_first > s_last)) {
 561                 if (info->flash_id == FLASH_UNKNOWN) {
 562                         printf ("- missing\n");
 563                 } else {
 564                         printf ("- no sectors to erase\n");
 565                 }
 566                 return 1;
 567         }
 568
 569         if ((info->flash_id&FLASH_VENDMASK) == FLASH_MAN_INTEL)  {
 570                 return flash_erase_intel(info,
 571                                 (unsigned short)s_first,
 572                                 (unsigned short)s_last);
 573         }
 574
 575 #if 0
 576         if ((info->flash_id == FLASH_UNKNOWN) ||
 577             (info->flash_id > FLASH_AMD_COMP)) {
 578                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 579                         info->flash_id);
 580                 return 1;
 581         }
 582 #endif
 583
 584         prot = 0;
 585         for (sect=s_first; sect<=s_last; ++sect) {
 586                 if (info->protect[sect]) {
 587                         prot++;
 588                 }
 589         }
 590
 591         if (prot) {
 592                 printf ("- Warning: %d protected sectors will not be erased!\n",
 593                         prot);
 594         } else {
 595                 printf ("\n");
 596         }
 597
 598         l_sect = -1;
 599
 600         /* Disable interrupts which might cause a timeout here */
 601         flag = disable_interrupts();
 602
 603         flash_cmd(info->portwidth,addr,0x555,0xAA);
 604         flash_cmd(info->portwidth,addr,0x2AA,0x55);
 605         flash_cmd(info->portwidth,addr,0x555,0x80);
 606         flash_cmd(info->portwidth,addr,0x555,0xAA);
 607         flash_cmd(info->portwidth,addr,0x2AA,0x55);
 608
 609         /* Start erase on unprotected sectors */
 610         for (sect = s_first; sect<=s_last; sect++) {
 611                 if (info->protect[sect] == 0) { /* not protected */
 612                         addr = (char *)(info->start[sect]);
 613                         flash_cmd(info->portwidth,addr,0,0x30);
 614                         l_sect = sect;
 615                 }
 616         }
 617
 618         /* re-enable interrupts if necessary */
 619         if (flag)
 620                 enable_interrupts();
 621
 622         /* wait at least 80us - let's wait 1 ms */
 623         udelay (1000);
 624
 625         /*
 626          * We wait for the last triggered sector
 627          */
 628         if (l_sect < 0)
 629                 goto DONE;
 630
 631         start = get_timer (0);
 632         last  = start;
 633         addr = (volatile unsigned char *)(info->start[l_sect]);
 634         /* broken for 2x16: TODO */
 635         while ((addr[0] & 0x80) != 0x80) {
 636                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 637                         printf ("Timeout\n");
 638                         return 1;
 639                 }
 640                 /* show that we're waiting */
 641                 if ((now - last) > 1000) {      /* every second */
 642                         putc ('.');
 643                         last = now;
 644                 }
 645         }
 646
 647 DONE:
 648         /* reset to read mode */
 649         addr = (volatile unsigned char *)info->start[0];
 650         flash_cmd(info->portwidth,addr,0,0xf0);
 651         flash_cmd(info->portwidth,addr,0,0xf0);
 652
 653         printf (" done\n");
 654         return 0;
 655 }
 656
 657 /*-----------------------------------------------------------------------
 658  * Copy memory to flash, returns:
 659  * 0 - OK
 660  * 1 - write timeout
 661  * 2 - Flash not erased
 662  */
 663
 664 /* broken for 2x16: TODO */
 665 int
 666 write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 667 {
 668         ulong cp, wp, data;
 669         int i, l, rc;
 670
 671         if(info->portwidth==4) return 1;
 672
 673         if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 0;
 674         if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
 675             memcpy((void *)addr, src, cnt);
 676             return 0;
 677         }
 678
 679         wp = (addr & ~3);       /* get lower word aligned address */
 680
 681         /*
 682          * handle unaligned start bytes
 683          */
 684         if ((l = addr - wp) != 0) {
 685                 data = 0;
 686                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 687                         data = (data << 8) | (*(uchar *)cp);
 688                 }
 689                 for (; i<4 && cnt>0; ++i) {
 690                         data = (data << 8) | *src++;
 691                         --cnt;
 692                         ++cp;
 693                 }
 694                 for (; cnt==0 && i<4; ++i, ++cp) {
 695                         data = (data << 8) | (*(uchar *)cp);
 696                 }
 697
 698                 if ((rc = write_word(info, wp, data)) != 0) {
 699                         return (rc);
 700                 }
 701                 wp += 4;
 702         }
 703
 704         /*
 705          * handle word aligned part
 706          */
 707         while (cnt >= 4) {
 708                 data = 0;
 709                 for (i=0; i<4; ++i) {
 710                         data = (data << 8) | *src++;
 711                 }
 712                 if ((rc = write_word(info, wp, data)) != 0) {
 713                         return (rc);
 714                 }
 715                 wp  += 4;
 716                 cnt -= 4;
 717         }
 718
 719         if (cnt == 0) {
 720                 return (0);
 721         }
 722
 723         /*
 724          * handle unaligned tail bytes
 725          */
 726         data = 0;
 727         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 728                 data = (data << 8) | *src++;
 729                 --cnt;
 730         }
 731         for (; i<4; ++i, ++cp) {
 732                 data = (data << 8) | (*(uchar *)cp);
 733         }
 734
 735         return (write_word(info, wp, data));
 736 }
 737
 738 /*-----------------------------------------------------------------------
 739  * Write a word to Flash, returns:
 740  * 0 - OK
 741  * 1 - write timeout
 742  * 2 - Flash not erased
 743  */
 744 /* broken for 2x16: TODO */
 745 static int
 746 write_word (flash_info_t *info, ulong dest, ulong data)
 747 {
 748         volatile unsigned char *addr = (char *)(info->start[0]);
 749         ulong start;
 750         int flag, i;
 751
 752         if(info->portwidth==4) return 1;
 753
 754         if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
 755         if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
 756             *(unsigned long *)dest=data;
 757             return 0;
 758         }
 759         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)  {
 760                 unsigned short low = data & 0xffff;
 761                 unsigned short hi  = (data >> 16) & 0xffff;
 762                 int ret = write_word_intel((bank_addr_t)dest, hi);
 763
 764                 if (!ret) ret = write_word_intel((bank_addr_t)(dest+2), low);
 765
 766                 return ret;
 767         }
 768
 769         /* Check if Flash is (sufficiently) erased */
 770         if ((*((vu_long *)dest) & data) != data) {
 771                 return (2);
 772         }
 773         /* Disable interrupts which might cause a timeout here */
 774         flag = disable_interrupts();
 775
 776         /* first, perform an unlock bypass command to speed up flash writes */
 777         addr[0x555] = 0xAA;
 778         addr[0x2AA] = 0x55;
 779         addr[0x555] = 0x20;
 780
 781         /* write each byte out */
 782         for (i = 0; i < 4; i++) {
 783                 char *data_ch = (char *)&data;
 784                 addr[0] = 0xA0;
 785                 *(((char *)dest)+i) = data_ch[i];
 786                 udelay(10); /* XXX */
 787         }
 788
 789         /* we're done, now do an unlock bypass reset */
 790         addr[0] = 0x90;
 791         addr[0] = 0x00;
 792
 793         /* re-enable interrupts if necessary */
 794         if (flag)
 795                 enable_interrupts();
 796
 797         /* data polling for D7 */
 798         start = get_timer (0);
 799         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 800                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 801                         return (1);
 802                 }
 803         }
 804         return (0);
 805 }