board/bubinga405ep/flash.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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  * Modified 4/5/2001
  26  * Wait for completion of each sector erase command issued
  27  * 4/5/2001
  28  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  29  */
  30
  31 #include <common.h>
  32 #include <ppc4xx.h>
  33 #include <asm/processor.h>
  34
  35 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  36
  37 /*-----------------------------------------------------------------------
  38  * Functions
  39  */
  40 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  41 static int write_word (flash_info_t *info, ulong dest, ulong data);
  42 static void flash_get_offsets (ulong base, flash_info_t *info);
  43
  44 #ifdef CONFIG_ADCIOP
  45 #define ADDR0           0x0aa9
  46 #define ADDR1           0x0556
  47 #define FLASH_WORD_SIZE unsigned char
  48 #endif
  49
  50 #ifdef CONFIG_CPCI405
  51 #define ADDR0           0x5555
  52 #define ADDR1           0x2aaa
  53 #define FLASH_WORD_SIZE unsigned short
  54 #endif
  55
  56 #ifdef CONFIG_WALNUT405
  57 #define ADDR0           0x5555
  58 #define ADDR1           0x2aaa
  59 #define FLASH_WORD_SIZE unsigned char
  60 #endif
  61
  62 #ifdef CONFIG_BUBINGA405EP
  63 #define ADDR0           0x5555
  64 #define ADDR1           0x2aaa
  65 #define FLASH_WORD_SIZE unsigned char
  66 #endif
  67
  68
  69 /*-----------------------------------------------------------------------
  70  */
  71
  72 unsigned long flash_init (void)
  73 {
  74         unsigned long size_b0, size_b1;
  75         int i;
  76         uint pbcr;
  77         unsigned long base_b0, base_b1;
  78
  79         /* Init: no FLASHes known */
  80         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  81                 flash_info[i].flash_id = FLASH_UNKNOWN;
  82         }
  83
  84         /* Static FLASH Bank configuration here - FIXME XXX */
  85
  86         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  87
  88         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  89                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  90                         size_b0, size_b0<<20);
  91         }
  92
  93         /* Only one bank */
  94         if (CFG_MAX_FLASH_BANKS == 1)
  95           {
  96             /* Setup offsets */
  97             flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
  98
  99             /* Monitor protection ON by default */
 100             (void)flash_protect(FLAG_PROTECT_SET,
 101                                 FLASH_BASE0_PRELIM,
 102                                 FLASH_BASE0_PRELIM+CFG_MONITOR_LEN-1,
 103                                 &flash_info[0]);
 104             /* Also protect sector containing initial power-up instruction */
 105             (void)flash_protect(FLAG_PROTECT_SET,
 106                                 0xFFFFFFFC,
 107                                 0xFFFFFFFF,
 108                                 &flash_info[0]);
 109             size_b1 = 0 ;
 110             flash_info[0].size = size_b0;
 111           }
 112
 113         /* 2 banks */
 114         else
 115           {
 116             size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
 117
 118             /* Re-do sizing to get full correct info */
 119
 120             if (size_b1)
 121               {
 122                 mtdcr(ebccfga, pb0cr);
 123                 pbcr = mfdcr(ebccfgd);
 124                 mtdcr(ebccfga, pb0cr);
 125                 base_b1 = -size_b1;
 126                 pbcr = (pbcr & 0x0001ffff) | base_b1 | (((size_b1/1024/1024)-1)<<17);
 127                 mtdcr(ebccfgd, pbcr);
 128                 /*          printf("pb1cr = %x\n", pbcr); */
 129               }
 130
 131             if (size_b0)
 132               {
 133                 mtdcr(ebccfga, pb1cr);
 134                 pbcr = mfdcr(ebccfgd);
 135                 mtdcr(ebccfga, pb1cr);
 136                 base_b0 = base_b1 - size_b0;
 137                 pbcr = (pbcr & 0x0001ffff) | base_b0 | (((size_b0/1024/1024)-1)<<17);
 138                 mtdcr(ebccfgd, pbcr);
 139                 /*            printf("pb0cr = %x\n", pbcr); */
 140               }
 141
 142             size_b0 = flash_get_size((vu_long *)base_b0, &flash_info[0]);
 143
 144             flash_get_offsets (base_b0, &flash_info[0]);
 145
 146             /* monitor protection ON by default */
 147             (void)flash_protect(FLAG_PROTECT_SET,
 148                                 base_b0+size_b0-CFG_MONITOR_LEN,
 149                                 base_b0+size_b0-1,
 150                                 &flash_info[0]);
 151             /* Also protect sector containing initial power-up instruction */
 152             /* (flash_protect() checks address range - other call ignored) */
 153             (void)flash_protect(FLAG_PROTECT_SET,
 154                                 0xFFFFFFFC,
 155                                 0xFFFFFFFF,
 156                                 &flash_info[0]);
 157             (void)flash_protect(FLAG_PROTECT_SET,
 158                                 0xFFFFFFFC,
 159                                 0xFFFFFFFF,
 160                                 &flash_info[1]);
 161
 162             if (size_b1) {
 163               /* Re-do sizing to get full correct info */
 164               size_b1 = flash_get_size((vu_long *)base_b1, &flash_info[1]);
 165
 166               flash_get_offsets (base_b1, &flash_info[1]);
 167
 168               /* monitor protection ON by default */
 169               (void)flash_protect(FLAG_PROTECT_SET,
 170                                   base_b1+size_b1-CFG_MONITOR_LEN,
 171                                   base_b1+size_b1-1,
 172                                   &flash_info[1]);
 173               /* monitor protection OFF by default (one is enough) */
 174               (void)flash_protect(FLAG_PROTECT_CLEAR,
 175                                   base_b0+size_b0-CFG_MONITOR_LEN,
 176                                   base_b0+size_b0-1,
 177                                   &flash_info[0]);
 178             } else {
 179               flash_info[1].flash_id = FLASH_UNKNOWN;
 180               flash_info[1].sector_count = -1;
 181             }
 182
 183             flash_info[0].size = size_b0;
 184             flash_info[1].size = size_b1;
 185           }/* else 2 banks */
 186         return (size_b0 + size_b1);
 187 }
 188
 189
 190 /*-----------------------------------------------------------------------
 191  */
 192 static void flash_get_offsets (ulong base, flash_info_t *info)
 193 {
 194         int i;
 195
 196         /* set up sector start address table */
 197         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 198             (info->flash_id  == FLASH_AM040)){
 199             for (i = 0; i < info->sector_count; i++)
 200                 info->start[i] = base + (i * 0x00010000);
 201         } else {
 202             if (info->flash_id & FLASH_BTYPE) {
 203                 /* set sector offsets for bottom boot block type        */
 204                 info->start[0] = base + 0x00000000;
 205                 info->start[1] = base + 0x00004000;
 206                 info->start[2] = base + 0x00006000;
 207                 info->start[3] = base + 0x00008000;
 208                 for (i = 4; i < info->sector_count; i++) {
 209                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 210                 }
 211             } else {
 212                 /* set sector offsets for top boot block type           */
 213                 i = info->sector_count - 1;
 214                 info->start[i--] = base + info->size - 0x00004000;
 215                 info->start[i--] = base + info->size - 0x00006000;
 216                 info->start[i--] = base + info->size - 0x00008000;
 217                 for (; i >= 0; i--) {
 218                         info->start[i] = base + i * 0x00010000;
 219                 }
 220             }
 221         }
 222 }
 223
 224 /*-----------------------------------------------------------------------
 225  */
 226 void flash_print_info  (flash_info_t *info)
 227 {
 228         int i;
 229         int k;
 230         int size;
 231         int erased;
 232         volatile unsigned long *flash;
 233
 234         if (info->flash_id == FLASH_UNKNOWN) {
 235                 printf ("missing or unknown FLASH type\n");
 236                 return;
 237         }
 238
 239         switch (info->flash_id & FLASH_VENDMASK) {
 240         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 241         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 242         case FLASH_MAN_SST:     printf ("SST ");                break;
 243         default:                printf ("Unknown Vendor ");     break;
 244         }
 245
 246         switch (info->flash_id & FLASH_TYPEMASK) {
 247         case FLASH_AM040:       printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 248                                 break;
 249         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 250                                 break;
 251         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 252                                 break;
 253         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 254                                 break;
 255         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 256                                 break;
 257         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 258                                 break;
 259         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 260                                 break;
 261         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 262                                 break;
 263         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 264                                 break;
 265         case FLASH_SST800A:     printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 266                                 break;
 267         case FLASH_SST160A:     printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 268                                 break;
 269         default:                printf ("Unknown Chip Type\n");
 270                                 break;
 271         }
 272
 273         printf ("  Size: %ld KB in %d Sectors\n",
 274                 info->size >> 10, info->sector_count);
 275
 276         printf ("  Sector Start Addresses:");
 277         for (i=0; i<info->sector_count; ++i) {
 278                 /*
 279                  * Check if whole sector is erased
 280                  */
 281                 if (i != (info->sector_count-1))
 282                   size = info->start[i+1] - info->start[i];
 283                 else
 284                   size = info->start[0] + info->size - info->start[i];
 285                 erased = 1;
 286                 flash = (volatile unsigned long *)info->start[i];
 287                 size = size >> 2;        /* divide by 4 for longword access */
 288                 for (k=0; k<size; k++)
 289                   {
 290                     if (*flash++ != 0xffffffff)
 291                       {
 292                         erased = 0;
 293                         break;
 294                       }
 295                   }
 296
 297                 if ((i % 5) == 0)
 298                         printf ("\n   ");
 299 #if 0 /* test-only */
 300                 printf (" %08lX%s",
 301                         info->start[i],
 302                         info->protect[i] ? " (RO)" : "     "
 303 #else
 304                 printf (" %08lX%s%s",
 305                         info->start[i],
 306                         erased ? " E" : "  ",
 307                         info->protect[i] ? "RO " : "   "
 308 #endif
 309                 );
 310         }
 311         printf ("\n");
 312         return;
 313 }
 314
 315 /*-----------------------------------------------------------------------
 316  */
 317
 318
 319 /*-----------------------------------------------------------------------
 320  */
 321
 322 /*
 323  * The following code cannot be run from FLASH!
 324  */
 325 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 326 {
 327         short i;
 328         FLASH_WORD_SIZE value;
 329         ulong base = (ulong)addr;
 330         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
 331
 332         /* Write auto select command: read Manufacturer ID */
 333         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 334         addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 335         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
 336
 337 #ifdef CONFIG_ADCIOP
 338         value = addr2[2];
 339 #else
 340         value = addr2[0];
 341 #endif
 342
 343         switch (value) {
 344         case (FLASH_WORD_SIZE)AMD_MANUFACT:
 345                 info->flash_id = FLASH_MAN_AMD;
 346                 break;
 347         case (FLASH_WORD_SIZE)FUJ_MANUFACT:
 348                 info->flash_id = FLASH_MAN_FUJ;
 349                 break;
 350         case (FLASH_WORD_SIZE)SST_MANUFACT:
 351                 info->flash_id = FLASH_MAN_SST;
 352                 break;
 353         default:
 354                 info->flash_id = FLASH_UNKNOWN;
 355                 info->sector_count = 0;
 356                 info->size = 0;
 357                 return (0);                     /* no or unknown flash  */
 358         }
 359
 360 #ifdef CONFIG_ADCIOP
 361         value = addr2[0];                       /* device ID            */
 362         /*        printf("\ndev_code=%x\n", value); */
 363 #else
 364         value = addr2[1];                       /* device ID            */
 365 #endif
 366
 367         switch (value) {
 368         case (FLASH_WORD_SIZE)AMD_ID_F040B:
 369                 info->flash_id += FLASH_AM040;
 370                 info->sector_count = 8;
 371                 info->size = 0x0080000; /* => 512 ko */
 372                 break;
 373         case (FLASH_WORD_SIZE)AMD_ID_LV400T:
 374                 info->flash_id += FLASH_AM400T;
 375                 info->sector_count = 11;
 376                 info->size = 0x00080000;
 377                 break;                          /* => 0.5 MB            */
 378
 379         case (FLASH_WORD_SIZE)AMD_ID_LV400B:
 380                 info->flash_id += FLASH_AM400B;
 381                 info->sector_count = 11;
 382                 info->size = 0x00080000;
 383                 break;                          /* => 0.5 MB            */
 384
 385         case (FLASH_WORD_SIZE)AMD_ID_LV800T:
 386                 info->flash_id += FLASH_AM800T;
 387                 info->sector_count = 19;
 388                 info->size = 0x00100000;
 389                 break;                          /* => 1 MB              */
 390
 391         case (FLASH_WORD_SIZE)AMD_ID_LV800B:
 392                 info->flash_id += FLASH_AM800B;
 393                 info->sector_count = 19;
 394                 info->size = 0x00100000;
 395                 break;                          /* => 1 MB              */
 396
 397         case (FLASH_WORD_SIZE)AMD_ID_LV160T:
 398                 info->flash_id += FLASH_AM160T;
 399                 info->sector_count = 35;
 400                 info->size = 0x00200000;
 401                 break;                          /* => 2 MB              */
 402
 403         case (FLASH_WORD_SIZE)AMD_ID_LV160B:
 404                 info->flash_id += FLASH_AM160B;
 405                 info->sector_count = 35;
 406                 info->size = 0x00200000;
 407                 break;                          /* => 2 MB              */
 408 #if 0   /* enable when device IDs are available */
 409         case (FLASH_WORD_SIZE)AMD_ID_LV320T:
 410                 info->flash_id += FLASH_AM320T;
 411                 info->sector_count = 67;
 412                 info->size = 0x00400000;
 413                 break;                          /* => 4 MB              */
 414
 415         case (FLASH_WORD_SIZE)AMD_ID_LV320B:
 416                 info->flash_id += FLASH_AM320B;
 417                 info->sector_count = 67;
 418                 info->size = 0x00400000;
 419                 break;                          /* => 4 MB              */
 420 #endif
 421         case (FLASH_WORD_SIZE)SST_ID_xF800A:
 422                 info->flash_id += FLASH_SST800A;
 423                 info->sector_count = 16;
 424                 info->size = 0x00100000;
 425                 break;                          /* => 1 MB              */
 426
 427         case (FLASH_WORD_SIZE)SST_ID_xF160A:
 428                 info->flash_id += FLASH_SST160A;
 429                 info->sector_count = 32;
 430                 info->size = 0x00200000;
 431                 break;                          /* => 2 MB              */
 432
 433         default:
 434                 info->flash_id = FLASH_UNKNOWN;
 435                 return (0);                     /* => no or unknown flash */
 436
 437         }
 438
 439         /* set up sector start address table */
 440         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 441             (info->flash_id  == FLASH_AM040)){
 442             for (i = 0; i < info->sector_count; i++)
 443                 info->start[i] = base + (i * 0x00010000);
 444         } else {
 445             if (info->flash_id & FLASH_BTYPE) {
 446                 /* set sector offsets for bottom boot block type        */
 447                 info->start[0] = base + 0x00000000;
 448                 info->start[1] = base + 0x00004000;
 449                 info->start[2] = base + 0x00006000;
 450                 info->start[3] = base + 0x00008000;
 451                 for (i = 4; i < info->sector_count; i++) {
 452                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 453                 }
 454             } else {
 455                 /* set sector offsets for top boot block type           */
 456                 i = info->sector_count - 1;
 457                 info->start[i--] = base + info->size - 0x00004000;
 458                 info->start[i--] = base + info->size - 0x00006000;
 459                 info->start[i--] = base + info->size - 0x00008000;
 460                 for (; i >= 0; i--) {
 461                         info->start[i] = base + i * 0x00010000;
 462                 }
 463             }
 464         }
 465
 466         /* check for protected sectors */
 467         for (i = 0; i < info->sector_count; i++) {
 468                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 469                 /* D0 = 1 if protected */
 470 #ifdef CONFIG_ADCIOP
 471                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 472                 info->protect[i] = addr2[4] & 1;
 473 #else
 474                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 475                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 476                   info->protect[i] = 0;
 477                 else
 478                   info->protect[i] = addr2[2] & 1;
 479 #endif
 480         }
 481
 482         /*
 483          * Prevent writes to uninitialized FLASH.
 484          */
 485         if (info->flash_id != FLASH_UNKNOWN) {
 486 #if 0 /* test-only */
 487 #ifdef CONFIG_ADCIOP
 488                 addr2 = (volatile unsigned char *)info->start[0];
 489                 addr2[ADDR0] = 0xAA;
 490                 addr2[ADDR1] = 0x55;
 491                 addr2[ADDR0] = 0xF0;  /* reset bank */
 492 #else
 493                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 494                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 495 #endif
 496 #else /* test-only */
 497                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 498                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 499 #endif /* test-only */
 500         }
 501
 502         return (info->size);
 503 }
 504
 505 int wait_for_DQ7(flash_info_t *info, int sect)
 506 {
 507         ulong start, now, last;
 508         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
 509
 510         start = get_timer (0);
 511         last  = 0;
 512         while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 513                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 514                         printf ("Timeout\n");
 515                         return -1;
 516                 }
 517                 /* show that we're waiting */
 518                 if ((now - last) > 1000) {  /* every second */
 519                         putc ('.');
 520                         last = now;
 521                 }
 522         }
 523         return 0;
 524 }
 525
 526 /*-----------------------------------------------------------------------
 527  */
 528
 529 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 530 {
 531         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 532         volatile FLASH_WORD_SIZE *addr2;
 533         int flag, prot, sect, l_sect;
 534         int i;
 535
 536         if ((s_first < 0) || (s_first > s_last)) {
 537                 if (info->flash_id == FLASH_UNKNOWN) {
 538                         printf ("- missing\n");
 539                 } else {
 540                         printf ("- no sectors to erase\n");
 541                 }
 542                 return 1;
 543         }
 544
 545         if (info->flash_id == FLASH_UNKNOWN) {
 546                 printf ("Can't erase unknown flash type - aborted\n");
 547                 return 1;
 548         }
 549
 550         prot = 0;
 551         for (sect=s_first; sect<=s_last; ++sect) {
 552                 if (info->protect[sect]) {
 553                         prot++;
 554                 }
 555         }
 556
 557         if (prot) {
 558                 printf ("- Warning: %d protected sectors will not be erased!\n",
 559                         prot);
 560         } else {
 561                 printf ("\n");
 562         }
 563
 564         l_sect = -1;
 565
 566         /* Disable interrupts which might cause a timeout here */
 567         flag = disable_interrupts();
 568
 569         /* Start erase on unprotected sectors */
 570         for (sect = s_first; sect<=s_last; sect++) {
 571                 if (info->protect[sect] == 0) { /* not protected */
 572                     addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
 573                     printf("Erasing sector %p\n", addr2);       /* CLH */
 574
 575                     if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 576                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 577                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 578                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 579                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 580                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 581                         addr2[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 582                         for (i=0; i<50; i++)
 583                                 udelay(1000);  /* wait 1 ms */
 584                     } else {
 585                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 586                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 587                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 588                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 589                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 590                         addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 591                     }
 592                     l_sect = sect;
 593                     /*
 594                      * Wait for each sector to complete, it's more
 595                      * reliable.  According to AMD Spec, you must
 596                      * issue all erase commands within a specified
 597                      * timeout.  This has been seen to fail, especially
 598                      * if printf()s are included (for debug)!!
 599                      */
 600                     wait_for_DQ7(info, sect);
 601                 }
 602         }
 603
 604         /* re-enable interrupts if necessary */
 605         if (flag)
 606                 enable_interrupts();
 607
 608         /* wait at least 80us - let's wait 1 ms */
 609         udelay (1000);
 610
 611 #if 0
 612         /*
 613          * We wait for the last triggered sector
 614          */
 615         if (l_sect < 0)
 616                 goto DONE;
 617         wait_for_DQ7(info, l_sect);
 618
 619 DONE:
 620 #endif
 621         /* reset to read mode */
 622         addr = (FLASH_WORD_SIZE *)info->start[0];
 623         addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
 624
 625         printf (" done\n");
 626         return 0;
 627 }
 628
 629 /*-----------------------------------------------------------------------
 630  * Copy memory to flash, returns:
 631  * 0 - OK
 632  * 1 - write timeout
 633  * 2 - Flash not erased
 634  */
 635
 636 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 637 {
 638         ulong cp, wp, data;
 639         int i, l, rc;
 640
 641         wp = (addr & ~3);       /* get lower word aligned address */
 642
 643         /*
 644          * handle unaligned start bytes
 645          */
 646         if ((l = addr - wp) != 0) {
 647                 data = 0;
 648                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 649                         data = (data << 8) | (*(uchar *)cp);
 650                 }
 651                 for (; i<4 && cnt>0; ++i) {
 652                         data = (data << 8) | *src++;
 653                         --cnt;
 654                         ++cp;
 655                 }
 656                 for (; cnt==0 && i<4; ++i, ++cp) {
 657                         data = (data << 8) | (*(uchar *)cp);
 658                 }
 659
 660                 if ((rc = write_word(info, wp, data)) != 0) {
 661                         return (rc);
 662                 }
 663                 wp += 4;
 664         }
 665
 666         /*
 667          * handle word aligned part
 668          */
 669         while (cnt >= 4) {
 670                 data = 0;
 671                 for (i=0; i<4; ++i) {
 672                         data = (data << 8) | *src++;
 673                 }
 674                 if ((rc = write_word(info, wp, data)) != 0) {
 675                         return (rc);
 676                 }
 677                 wp  += 4;
 678                 cnt -= 4;
 679         }
 680
 681         if (cnt == 0) {
 682                 return (0);
 683         }
 684
 685         /*
 686          * handle unaligned tail bytes
 687          */
 688         data = 0;
 689         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 690                 data = (data << 8) | *src++;
 691                 --cnt;
 692         }
 693         for (; i<4; ++i, ++cp) {
 694                 data = (data << 8) | (*(uchar *)cp);
 695         }
 696
 697         return (write_word(info, wp, data));
 698 }
 699
 700 /*-----------------------------------------------------------------------
 701  * Write a word to Flash, returns:
 702  * 0 - OK
 703  * 1 - write timeout
 704  * 2 - Flash not erased
 705  */
 706 static int write_word (flash_info_t * info, ulong dest, ulong data)
 707 {
 708         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 709         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 710         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 711         ulong start;
 712         int i;
 713
 714         /* Check if Flash is (sufficiently) erased */
 715         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 716             (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 717                 return (2);
 718         }
 719
 720         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 721                 int flag;
 722
 723                 /* Disable interrupts which might cause a timeout here */
 724                 flag = disable_interrupts ();
 725
 726                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 727                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 728                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 729
 730                 dest2[i] = data2[i];
 731
 732                 /* re-enable interrupts if necessary */
 733                 if (flag)
 734                         enable_interrupts ();
 735
 736                 /* data polling for D7 */
 737                 start = get_timer (0);
 738                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 739                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 740
 741                         if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 742                                 return (1);
 743                         }
 744                 }
 745         }
 746
 747         return (0);
 748 }
 749
 750 /*-----------------------------------------------------------------------
 751  */