git.sur5r.net Git - u-boot/blob - 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             size_b1 = 0 ;
 105             flash_info[0].size = size_b0;
 106           }
 107
 108         /* 2 banks */
 109         else
 110           {
 111             size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
 112
 113             /* Re-do sizing to get full correct info */
 114
 115             if (size_b1)
 116               {
 117                 mtdcr(ebccfga, pb0cr);
 118                 pbcr = mfdcr(ebccfgd);
 119                 mtdcr(ebccfga, pb0cr);
 120                 base_b1 = -size_b1;
 121                 pbcr = (pbcr & 0x0001ffff) | base_b1 | (((size_b1/1024/1024)-1)<<17);
 122                 mtdcr(ebccfgd, pbcr);
 123                 /*          printf("pb1cr = %x\n", pbcr); */
 124               }
 125
 126             if (size_b0)
 127               {
 128                 mtdcr(ebccfga, pb1cr);
 129                 pbcr = mfdcr(ebccfgd);
 130                 mtdcr(ebccfga, pb1cr);
 131                 base_b0 = base_b1 - size_b0;
 132                 pbcr = (pbcr & 0x0001ffff) | base_b0 | (((size_b0/1024/1024)-1)<<17);
 133                 mtdcr(ebccfgd, pbcr);
 134                 /*            printf("pb0cr = %x\n", pbcr); */
 135               }
 136
 137             size_b0 = flash_get_size((vu_long *)base_b0, &flash_info[0]);
 138
 139             flash_get_offsets (base_b0, &flash_info[0]);
 140
 141             /* monitor protection ON by default */
 142             (void)flash_protect(FLAG_PROTECT_SET,
 143                                 base_b0+size_b0-CFG_MONITOR_LEN,
 144                                 base_b0+size_b0-1,
 145                                 &flash_info[0]);
 146
 147             if (size_b1) {
 148               /* Re-do sizing to get full correct info */
 149               size_b1 = flash_get_size((vu_long *)base_b1, &flash_info[1]);
 150
 151               flash_get_offsets (base_b1, &flash_info[1]);
 152
 153               /* monitor protection ON by default */
 154               (void)flash_protect(FLAG_PROTECT_SET,
 155                                   base_b1+size_b1-CFG_MONITOR_LEN,
 156                                   base_b1+size_b1-1,
 157                                   &flash_info[1]);
 158               /* monitor protection OFF by default (one is enough) */
 159               (void)flash_protect(FLAG_PROTECT_CLEAR,
 160                                   base_b0+size_b0-CFG_MONITOR_LEN,
 161                                   base_b0+size_b0-1,
 162                                   &flash_info[0]);
 163             } else {
 164               flash_info[1].flash_id = FLASH_UNKNOWN;
 165               flash_info[1].sector_count = -1;
 166             }
 167
 168             flash_info[0].size = size_b0;
 169             flash_info[1].size = size_b1;
 170           }/* else 2 banks */
 171         return (size_b0 + size_b1);
 172 }
 173
 174
 175 /*-----------------------------------------------------------------------
 176  */
 177 static void flash_get_offsets (ulong base, flash_info_t *info)
 178 {
 179         int i;
 180
 181         /* set up sector start address table */
 182         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 183             (info->flash_id  == FLASH_AM040)){
 184             for (i = 0; i < info->sector_count; i++)
 185                 info->start[i] = base + (i * 0x00010000);
 186         } else {
 187             if (info->flash_id & FLASH_BTYPE) {
 188                 /* set sector offsets for bottom boot block type        */
 189                 info->start[0] = base + 0x00000000;
 190                 info->start[1] = base + 0x00004000;
 191                 info->start[2] = base + 0x00006000;
 192                 info->start[3] = base + 0x00008000;
 193                 for (i = 4; i < info->sector_count; i++) {
 194                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 195                 }
 196             } else {
 197                 /* set sector offsets for top boot block type           */
 198                 i = info->sector_count - 1;
 199                 info->start[i--] = base + info->size - 0x00004000;
 200                 info->start[i--] = base + info->size - 0x00006000;
 201                 info->start[i--] = base + info->size - 0x00008000;
 202                 for (; i >= 0; i--) {
 203                         info->start[i] = base + i * 0x00010000;
 204                 }
 205             }
 206         }
 207 }
 208
 209 /*-----------------------------------------------------------------------
 210  */
 211 void flash_print_info  (flash_info_t *info)
 212 {
 213         int i;
 214         int k;
 215         int size;
 216         int erased;
 217         volatile unsigned long *flash;
 218
 219         if (info->flash_id == FLASH_UNKNOWN) {
 220                 printf ("missing or unknown FLASH type\n");
 221                 return;
 222         }
 223
 224         switch (info->flash_id & FLASH_VENDMASK) {
 225         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 226         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 227         case FLASH_MAN_SST:     printf ("SST ");                break;
 228         default:                printf ("Unknown Vendor ");     break;
 229         }
 230
 231         switch (info->flash_id & FLASH_TYPEMASK) {
 232         case FLASH_AM040:       printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 233                                 break;
 234         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 235                                 break;
 236         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 237                                 break;
 238         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 239                                 break;
 240         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 241                                 break;
 242         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 243                                 break;
 244         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 245                                 break;
 246         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 247                                 break;
 248         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 249                                 break;
 250         case FLASH_SST800A:     printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 251                                 break;
 252         case FLASH_SST160A:     printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 253                                 break;
 254         default:                printf ("Unknown Chip Type\n");
 255                                 break;
 256         }
 257
 258         printf ("  Size: %ld KB in %d Sectors\n",
 259                 info->size >> 10, info->sector_count);
 260
 261         printf ("  Sector Start Addresses:");
 262         for (i=0; i<info->sector_count; ++i) {
 263                 /*
 264                  * Check if whole sector is erased
 265                  */
 266                 if (i != (info->sector_count-1))
 267                   size = info->start[i+1] - info->start[i];
 268                 else
 269                   size = info->start[0] + info->size - info->start[i];
 270                 erased = 1;
 271                 flash = (volatile unsigned long *)info->start[i];
 272                 size = size >> 2;        /* divide by 4 for longword access */
 273                 for (k=0; k<size; k++)
 274                   {
 275                     if (*flash++ != 0xffffffff)
 276                       {
 277                         erased = 0;
 278                         break;
 279                       }
 280                   }
 281
 282                 if ((i % 5) == 0)
 283                         printf ("\n   ");
 284 #if 0 /* test-only */
 285                 printf (" %08lX%s",
 286                         info->start[i],
 287                         info->protect[i] ? " (RO)" : "     "
 288 #else
 289                 printf (" %08lX%s%s",
 290                         info->start[i],
 291                         erased ? " E" : "  ",
 292                         info->protect[i] ? "RO " : "   "
 293 #endif
 294                 );
 295         }
 296         printf ("\n");
 297         return;
 298 }
 299
 300 /*-----------------------------------------------------------------------
 301  */
 302
 303
 304 /*-----------------------------------------------------------------------
 305  */
 306
 307 /*
 308  * The following code cannot be run from FLASH!
 309  */
 310 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 311 {
 312         short i;
 313         FLASH_WORD_SIZE value;
 314         ulong base = (ulong)addr;
 315         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
 316
 317         /* Write auto select command: read Manufacturer ID */
 318         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 319         addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 320         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
 321
 322 #ifdef CONFIG_ADCIOP
 323         value = addr2[2];
 324 #else
 325         value = addr2[0];
 326 #endif
 327
 328         switch (value) {
 329         case (FLASH_WORD_SIZE)AMD_MANUFACT:
 330                 info->flash_id = FLASH_MAN_AMD;
 331                 break;
 332         case (FLASH_WORD_SIZE)FUJ_MANUFACT:
 333                 info->flash_id = FLASH_MAN_FUJ;
 334                 break;
 335         case (FLASH_WORD_SIZE)SST_MANUFACT:
 336                 info->flash_id = FLASH_MAN_SST;
 337                 break;
 338         default:
 339                 info->flash_id = FLASH_UNKNOWN;
 340                 info->sector_count = 0;
 341                 info->size = 0;
 342                 return (0);                     /* no or unknown flash  */
 343         }
 344
 345 #ifdef CONFIG_ADCIOP
 346         value = addr2[0];                       /* device ID            */
 347         /*        printf("\ndev_code=%x\n", value); */
 348 #else
 349         value = addr2[1];                       /* device ID            */
 350 #endif
 351
 352         switch (value) {
 353         case (FLASH_WORD_SIZE)AMD_ID_F040B:
 354                 info->flash_id += FLASH_AM040;
 355                 info->sector_count = 8;
 356                 info->size = 0x0080000; /* => 512 ko */
 357                 break;
 358         case (FLASH_WORD_SIZE)AMD_ID_LV400T:
 359                 info->flash_id += FLASH_AM400T;
 360                 info->sector_count = 11;
 361                 info->size = 0x00080000;
 362                 break;                          /* => 0.5 MB            */
 363
 364         case (FLASH_WORD_SIZE)AMD_ID_LV400B:
 365                 info->flash_id += FLASH_AM400B;
 366                 info->sector_count = 11;
 367                 info->size = 0x00080000;
 368                 break;                          /* => 0.5 MB            */
 369
 370         case (FLASH_WORD_SIZE)AMD_ID_LV800T:
 371                 info->flash_id += FLASH_AM800T;
 372                 info->sector_count = 19;
 373                 info->size = 0x00100000;
 374                 break;                          /* => 1 MB              */
 375
 376         case (FLASH_WORD_SIZE)AMD_ID_LV800B:
 377                 info->flash_id += FLASH_AM800B;
 378                 info->sector_count = 19;
 379                 info->size = 0x00100000;
 380                 break;                          /* => 1 MB              */
 381
 382         case (FLASH_WORD_SIZE)AMD_ID_LV160T:
 383                 info->flash_id += FLASH_AM160T;
 384                 info->sector_count = 35;
 385                 info->size = 0x00200000;
 386                 break;                          /* => 2 MB              */
 387
 388         case (FLASH_WORD_SIZE)AMD_ID_LV160B:
 389                 info->flash_id += FLASH_AM160B;
 390                 info->sector_count = 35;
 391                 info->size = 0x00200000;
 392                 break;                          /* => 2 MB              */
 393 #if 0   /* enable when device IDs are available */
 394         case (FLASH_WORD_SIZE)AMD_ID_LV320T:
 395                 info->flash_id += FLASH_AM320T;
 396                 info->sector_count = 67;
 397                 info->size = 0x00400000;
 398                 break;                          /* => 4 MB              */
 399
 400         case (FLASH_WORD_SIZE)AMD_ID_LV320B:
 401                 info->flash_id += FLASH_AM320B;
 402                 info->sector_count = 67;
 403                 info->size = 0x00400000;
 404                 break;                          /* => 4 MB              */
 405 #endif
 406         case (FLASH_WORD_SIZE)SST_ID_xF800A:
 407                 info->flash_id += FLASH_SST800A;
 408                 info->sector_count = 16;
 409                 info->size = 0x00100000;
 410                 break;                          /* => 1 MB              */
 411
 412         case (FLASH_WORD_SIZE)SST_ID_xF160A:
 413                 info->flash_id += FLASH_SST160A;
 414                 info->sector_count = 32;
 415                 info->size = 0x00200000;
 416                 break;                          /* => 2 MB              */
 417
 418         default:
 419                 info->flash_id = FLASH_UNKNOWN;
 420                 return (0);                     /* => no or unknown flash */
 421
 422         }
 423
 424         /* set up sector start address table */
 425         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 426             (info->flash_id  == FLASH_AM040)){
 427             for (i = 0; i < info->sector_count; i++)
 428                 info->start[i] = base + (i * 0x00010000);
 429         } else {
 430             if (info->flash_id & FLASH_BTYPE) {
 431                 /* set sector offsets for bottom boot block type        */
 432                 info->start[0] = base + 0x00000000;
 433                 info->start[1] = base + 0x00004000;
 434                 info->start[2] = base + 0x00006000;
 435                 info->start[3] = base + 0x00008000;
 436                 for (i = 4; i < info->sector_count; i++) {
 437                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 438                 }
 439             } else {
 440                 /* set sector offsets for top boot block type           */
 441                 i = info->sector_count - 1;
 442                 info->start[i--] = base + info->size - 0x00004000;
 443                 info->start[i--] = base + info->size - 0x00006000;
 444                 info->start[i--] = base + info->size - 0x00008000;
 445                 for (; i >= 0; i--) {
 446                         info->start[i] = base + i * 0x00010000;
 447                 }
 448             }
 449         }
 450
 451         /* check for protected sectors */
 452         for (i = 0; i < info->sector_count; i++) {
 453                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 454                 /* D0 = 1 if protected */
 455 #ifdef CONFIG_ADCIOP
 456                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 457                 info->protect[i] = addr2[4] & 1;
 458 #else
 459                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 460                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 461                   info->protect[i] = 0;
 462                 else
 463                   info->protect[i] = addr2[2] & 1;
 464 #endif
 465         }
 466
 467         /*
 468          * Prevent writes to uninitialized FLASH.
 469          */
 470         if (info->flash_id != FLASH_UNKNOWN) {
 471 #if 0 /* test-only */
 472 #ifdef CONFIG_ADCIOP
 473                 addr2 = (volatile unsigned char *)info->start[0];
 474                 addr2[ADDR0] = 0xAA;
 475                 addr2[ADDR1] = 0x55;
 476                 addr2[ADDR0] = 0xF0;  /* reset bank */
 477 #else
 478                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 479                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 480 #endif
 481 #else /* test-only */
 482                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 483                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 484 #endif /* test-only */
 485         }
 486
 487         return (info->size);
 488 }
 489
 490 int wait_for_DQ7(flash_info_t *info, int sect)
 491 {
 492         ulong start, now, last;
 493         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
 494
 495         start = get_timer (0);
 496     last  = start;
 497     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 498         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 499             printf ("Timeout\n");
 500             return -1;
 501         }
 502         /* show that we're waiting */
 503         if ((now - last) > 1000) {  /* every second */
 504             putc ('.');
 505             last = now;
 506         }
 507     }
 508         return 0;
 509 }
 510
 511 /*-----------------------------------------------------------------------
 512  */
 513
 514 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 515 {
 516         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 517         volatile FLASH_WORD_SIZE *addr2;
 518         int flag, prot, sect, l_sect;
 519         int i;
 520
 521         if ((s_first < 0) || (s_first > s_last)) {
 522                 if (info->flash_id == FLASH_UNKNOWN) {
 523                         printf ("- missing\n");
 524                 } else {
 525                         printf ("- no sectors to erase\n");
 526                 }
 527                 return 1;
 528         }
 529
 530         if (info->flash_id == FLASH_UNKNOWN) {
 531                 printf ("Can't erase unknown flash type - aborted\n");
 532                 return 1;
 533         }
 534
 535         prot = 0;
 536         for (sect=s_first; sect<=s_last; ++sect) {
 537                 if (info->protect[sect]) {
 538                         prot++;
 539                 }
 540         }
 541
 542         if (prot) {
 543                 printf ("- Warning: %d protected sectors will not be erased!\n",
 544                         prot);
 545         } else {
 546                 printf ("\n");
 547         }
 548
 549         l_sect = -1;
 550
 551         /* Disable interrupts which might cause a timeout here */
 552         flag = disable_interrupts();
 553
 554         /* Start erase on unprotected sectors */
 555         for (sect = s_first; sect<=s_last; sect++) {
 556                 if (info->protect[sect] == 0) { /* not protected */
 557                     addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
 558                     printf("Erasing sector %p\n", addr2);       /* CLH */
 559
 560                     if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 561                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 562                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 563                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 564                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 565                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 566                         addr2[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 567                         for (i=0; i<50; i++)
 568                                 udelay(1000);  /* wait 1 ms */
 569                     } else {
 570                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 571                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 572                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 573                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 574                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 575                         addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 576                     }
 577                     l_sect = sect;
 578                     /*
 579                      * Wait for each sector to complete, it's more
 580                      * reliable.  According to AMD Spec, you must
 581                      * issue all erase commands within a specified
 582                      * timeout.  This has been seen to fail, especially
 583                      * if printf()s are included (for debug)!!
 584                      */
 585                     wait_for_DQ7(info, sect);
 586                 }
 587         }
 588
 589         /* re-enable interrupts if necessary */
 590         if (flag)
 591                 enable_interrupts();
 592
 593         /* wait at least 80us - let's wait 1 ms */
 594         udelay (1000);
 595
 596 #if 0
 597         /*
 598          * We wait for the last triggered sector
 599          */
 600         if (l_sect < 0)
 601                 goto DONE;
 602         wait_for_DQ7(info, l_sect);
 603
 604 DONE:
 605 #endif
 606         /* reset to read mode */
 607         addr = (FLASH_WORD_SIZE *)info->start[0];
 608         addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
 609
 610         printf (" done\n");
 611         return 0;
 612 }
 613
 614 /*-----------------------------------------------------------------------
 615  * Copy memory to flash, returns:
 616  * 0 - OK
 617  * 1 - write timeout
 618  * 2 - Flash not erased
 619  */
 620
 621 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 622 {
 623         ulong cp, wp, data;
 624         int i, l, rc;
 625
 626         wp = (addr & ~3);       /* get lower word aligned address */
 627
 628         /*
 629          * handle unaligned start bytes
 630          */
 631         if ((l = addr - wp) != 0) {
 632                 data = 0;
 633                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 634                         data = (data << 8) | (*(uchar *)cp);
 635                 }
 636                 for (; i<4 && cnt>0; ++i) {
 637                         data = (data << 8) | *src++;
 638                         --cnt;
 639                         ++cp;
 640                 }
 641                 for (; cnt==0 && i<4; ++i, ++cp) {
 642                         data = (data << 8) | (*(uchar *)cp);
 643                 }
 644
 645                 if ((rc = write_word(info, wp, data)) != 0) {
 646                         return (rc);
 647                 }
 648                 wp += 4;
 649         }
 650
 651         /*
 652          * handle word aligned part
 653          */
 654         while (cnt >= 4) {
 655                 data = 0;
 656                 for (i=0; i<4; ++i) {
 657                         data = (data << 8) | *src++;
 658                 }
 659                 if ((rc = write_word(info, wp, data)) != 0) {
 660                         return (rc);
 661                 }
 662                 wp  += 4;
 663                 cnt -= 4;
 664         }
 665
 666         if (cnt == 0) {
 667                 return (0);
 668         }
 669
 670         /*
 671          * handle unaligned tail bytes
 672          */
 673         data = 0;
 674         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 675                 data = (data << 8) | *src++;
 676                 --cnt;
 677         }
 678         for (; i<4; ++i, ++cp) {
 679                 data = (data << 8) | (*(uchar *)cp);
 680         }
 681
 682         return (write_word(info, wp, data));
 683 }
 684
 685 /*-----------------------------------------------------------------------
 686  * Write a word to Flash, returns:
 687  * 0 - OK
 688  * 1 - write timeout
 689  * 2 - Flash not erased
 690  */
 691 static int write_word (flash_info_t * info, ulong dest, ulong data)
 692 {
 693         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 694         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 695         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 696         ulong start;
 697         int i;
 698
 699         /* Check if Flash is (sufficiently) erased */
 700         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 701             (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 702                 return (2);
 703         }
 704
 705         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 706                 int flag;
 707
 708                 /* Disable interrupts which might cause a timeout here */
 709                 flag = disable_interrupts ();
 710
 711                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 712                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 713                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 714
 715                 dest2[i] = data2[i];
 716
 717                 /* re-enable interrupts if necessary */
 718                 if (flag)
 719                         enable_interrupts ();
 720
 721                 /* data polling for D7 */
 722                 start = get_timer (0);
 723                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 724                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 725
 726                         if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 727                                 return (1);
 728                         }
 729                 }
 730         }
 731
 732         return (0);
 733 }
 734
 735 /*-----------------------------------------------------------------------
 736  */