board/walnut405/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 /*-----------------------------------------------------------------------
  63  */
  64
  65 unsigned long flash_init (void)
  66 {
  67         unsigned long size_b0, size_b1;
  68         int i;
  69         uint pbcr;
  70         unsigned long base_b0, base_b1;
  71
  72         /* Init: no FLASHes known */
  73         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  74                 flash_info[i].flash_id = FLASH_UNKNOWN;
  75         }
  76
  77         /* Static FLASH Bank configuration here - FIXME XXX */
  78
  79         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  80
  81         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  82                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  83                         size_b0, size_b0<<20);
  84         }
  85
  86         /* Only one bank */
  87         if (CFG_MAX_FLASH_BANKS == 1)
  88           {
  89             /* Setup offsets */
  90             flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
  91
  92             /* Monitor protection ON by default */
  93             (void)flash_protect(FLAG_PROTECT_SET,
  94                                 FLASH_BASE0_PRELIM,
  95                                 FLASH_BASE0_PRELIM+monitor_flash_len-1,
  96                                 &flash_info[0]);
  97             size_b1 = 0 ;
  98             flash_info[0].size = size_b0;
  99           }
 100
 101         /* 2 banks */
 102         else
 103           {
 104             size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
 105
 106             /* Re-do sizing to get full correct info */
 107
 108             if (size_b1)
 109               {
 110                 mtdcr(ebccfga, pb0cr);
 111                 pbcr = mfdcr(ebccfgd);
 112                 mtdcr(ebccfga, pb0cr);
 113                 base_b1 = -size_b1;
 114                 pbcr = (pbcr & 0x0001ffff) | base_b1 | (((size_b1/1024/1024)-1)<<17);
 115                 mtdcr(ebccfgd, pbcr);
 116                 /*          printf("pb1cr = %x\n", pbcr); */
 117               }
 118
 119             if (size_b0)
 120               {
 121                 mtdcr(ebccfga, pb1cr);
 122                 pbcr = mfdcr(ebccfgd);
 123                 mtdcr(ebccfga, pb1cr);
 124                 base_b0 = base_b1 - size_b0;
 125                 pbcr = (pbcr & 0x0001ffff) | base_b0 | (((size_b0/1024/1024)-1)<<17);
 126                 mtdcr(ebccfgd, pbcr);
 127                 /*            printf("pb0cr = %x\n", pbcr); */
 128               }
 129
 130             size_b0 = flash_get_size((vu_long *)base_b0, &flash_info[0]);
 131
 132             flash_get_offsets (base_b0, &flash_info[0]);
 133
 134             /* monitor protection ON by default */
 135             (void)flash_protect(FLAG_PROTECT_SET,
 136                                 base_b0+size_b0-monitor_flash_len,
 137                                 base_b0+size_b0-1,
 138                                 &flash_info[0]);
 139
 140             if (size_b1) {
 141               /* Re-do sizing to get full correct info */
 142               size_b1 = flash_get_size((vu_long *)base_b1, &flash_info[1]);
 143
 144               flash_get_offsets (base_b1, &flash_info[1]);
 145
 146               /* monitor protection ON by default */
 147               (void)flash_protect(FLAG_PROTECT_SET,
 148                                   base_b1+size_b1-monitor_flash_len,
 149                                   base_b1+size_b1-1,
 150                                   &flash_info[1]);
 151               /* monitor protection OFF by default (one is enough) */
 152               (void)flash_protect(FLAG_PROTECT_CLEAR,
 153                                   base_b0+size_b0-monitor_flash_len,
 154                                   base_b0+size_b0-1,
 155                                   &flash_info[0]);
 156             } else {
 157               flash_info[1].flash_id = FLASH_UNKNOWN;
 158               flash_info[1].sector_count = -1;
 159             }
 160
 161             flash_info[0].size = size_b0;
 162             flash_info[1].size = size_b1;
 163           }/* else 2 banks */
 164         return (size_b0 + size_b1);
 165 }
 166
 167
 168 /*-----------------------------------------------------------------------
 169  */
 170 static void flash_get_offsets (ulong base, flash_info_t *info)
 171 {
 172         int i;
 173
 174         /* set up sector start address table */
 175         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 176             (info->flash_id  == FLASH_AM040)){
 177             for (i = 0; i < info->sector_count; i++)
 178                 info->start[i] = base + (i * 0x00010000);
 179         } else {
 180             if (info->flash_id & FLASH_BTYPE) {
 181                 /* set sector offsets for bottom boot block type        */
 182                 info->start[0] = base + 0x00000000;
 183                 info->start[1] = base + 0x00004000;
 184                 info->start[2] = base + 0x00006000;
 185                 info->start[3] = base + 0x00008000;
 186                 for (i = 4; i < info->sector_count; i++) {
 187                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 188                 }
 189             } else {
 190                 /* set sector offsets for top boot block type           */
 191                 i = info->sector_count - 1;
 192                 info->start[i--] = base + info->size - 0x00004000;
 193                 info->start[i--] = base + info->size - 0x00006000;
 194                 info->start[i--] = base + info->size - 0x00008000;
 195                 for (; i >= 0; i--) {
 196                         info->start[i] = base + i * 0x00010000;
 197                 }
 198             }
 199         }
 200 }
 201
 202 /*-----------------------------------------------------------------------
 203  */
 204 void flash_print_info  (flash_info_t *info)
 205 {
 206         int i;
 207         int k;
 208         int size;
 209         int erased;
 210         volatile unsigned long *flash;
 211
 212         if (info->flash_id == FLASH_UNKNOWN) {
 213                 printf ("missing or unknown FLASH type\n");
 214                 return;
 215         }
 216
 217         switch (info->flash_id & FLASH_VENDMASK) {
 218         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 219         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 220         case FLASH_MAN_SST:     printf ("SST ");                break;
 221         default:                printf ("Unknown Vendor ");     break;
 222         }
 223
 224         switch (info->flash_id & FLASH_TYPEMASK) {
 225         case FLASH_AM040:       printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 226                                 break;
 227         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 228                                 break;
 229         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 230                                 break;
 231         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 232                                 break;
 233         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 234                                 break;
 235         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 236                                 break;
 237         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 238                                 break;
 239         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 240                                 break;
 241         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 242                                 break;
 243         case FLASH_SST800A:     printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 244                                 break;
 245         case FLASH_SST160A:     printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 246                                 break;
 247         default:                printf ("Unknown Chip Type\n");
 248                                 break;
 249         }
 250
 251         printf ("  Size: %ld KB in %d Sectors\n",
 252                 info->size >> 10, info->sector_count);
 253
 254         printf ("  Sector Start Addresses:");
 255         for (i=0; i<info->sector_count; ++i) {
 256                 /*
 257                  * Check if whole sector is erased
 258                  */
 259                 if (i != (info->sector_count-1))
 260                   size = info->start[i+1] - info->start[i];
 261                 else
 262                   size = info->start[0] + info->size - info->start[i];
 263                 erased = 1;
 264                 flash = (volatile unsigned long *)info->start[i];
 265                 size = size >> 2;        /* divide by 4 for longword access */
 266                 for (k=0; k<size; k++)
 267                   {
 268                     if (*flash++ != 0xffffffff)
 269                       {
 270                         erased = 0;
 271                         break;
 272                       }
 273                   }
 274
 275                 if ((i % 5) == 0)
 276                         printf ("\n   ");
 277 #if 0 /* test-only */
 278                 printf (" %08lX%s",
 279                         info->start[i],
 280                         info->protect[i] ? " (RO)" : "     "
 281 #else
 282                 printf (" %08lX%s%s",
 283                         info->start[i],
 284                         erased ? " E" : "  ",
 285                         info->protect[i] ? "RO " : "   "
 286 #endif
 287                 );
 288         }
 289         printf ("\n");
 290         return;
 291 }
 292
 293 /*-----------------------------------------------------------------------
 294  */
 295
 296
 297 /*-----------------------------------------------------------------------
 298  */
 299
 300 /*
 301  * The following code cannot be run from FLASH!
 302  */
 303 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 304 {
 305         short i;
 306         FLASH_WORD_SIZE value;
 307         ulong base = (ulong)addr;
 308         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
 309
 310         /* Write auto select command: read Manufacturer ID */
 311         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 312         addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 313         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
 314
 315 #ifdef CONFIG_ADCIOP
 316         value = addr2[2];
 317 #else
 318         value = addr2[0];
 319 #endif
 320
 321         switch (value) {
 322         case (FLASH_WORD_SIZE)AMD_MANUFACT:
 323                 info->flash_id = FLASH_MAN_AMD;
 324                 break;
 325         case (FLASH_WORD_SIZE)FUJ_MANUFACT:
 326                 info->flash_id = FLASH_MAN_FUJ;
 327                 break;
 328         case (FLASH_WORD_SIZE)SST_MANUFACT:
 329                 info->flash_id = FLASH_MAN_SST;
 330                 break;
 331         default:
 332                 info->flash_id = FLASH_UNKNOWN;
 333                 info->sector_count = 0;
 334                 info->size = 0;
 335                 return (0);                     /* no or unknown flash  */
 336         }
 337
 338 #ifdef CONFIG_ADCIOP
 339         value = addr2[0];                       /* device ID            */
 340         /*        printf("\ndev_code=%x\n", value); */
 341 #else
 342         value = addr2[1];                       /* device ID            */
 343 #endif
 344
 345         switch (value) {
 346         case (FLASH_WORD_SIZE)AMD_ID_F040B:
 347                 info->flash_id += FLASH_AM040;
 348                 info->sector_count = 8;
 349                 info->size = 0x0080000; /* => 512 ko */
 350                 break;
 351         case (FLASH_WORD_SIZE)AMD_ID_LV400T:
 352                 info->flash_id += FLASH_AM400T;
 353                 info->sector_count = 11;
 354                 info->size = 0x00080000;
 355                 break;                          /* => 0.5 MB            */
 356
 357         case (FLASH_WORD_SIZE)AMD_ID_LV400B:
 358                 info->flash_id += FLASH_AM400B;
 359                 info->sector_count = 11;
 360                 info->size = 0x00080000;
 361                 break;                          /* => 0.5 MB            */
 362
 363         case (FLASH_WORD_SIZE)AMD_ID_LV800T:
 364                 info->flash_id += FLASH_AM800T;
 365                 info->sector_count = 19;
 366                 info->size = 0x00100000;
 367                 break;                          /* => 1 MB              */
 368
 369         case (FLASH_WORD_SIZE)AMD_ID_LV800B:
 370                 info->flash_id += FLASH_AM800B;
 371                 info->sector_count = 19;
 372                 info->size = 0x00100000;
 373                 break;                          /* => 1 MB              */
 374
 375         case (FLASH_WORD_SIZE)AMD_ID_LV160T:
 376                 info->flash_id += FLASH_AM160T;
 377                 info->sector_count = 35;
 378                 info->size = 0x00200000;
 379                 break;                          /* => 2 MB              */
 380
 381         case (FLASH_WORD_SIZE)AMD_ID_LV160B:
 382                 info->flash_id += FLASH_AM160B;
 383                 info->sector_count = 35;
 384                 info->size = 0x00200000;
 385                 break;                          /* => 2 MB              */
 386 #if 0   /* enable when device IDs are available */
 387         case (FLASH_WORD_SIZE)AMD_ID_LV320T:
 388                 info->flash_id += FLASH_AM320T;
 389                 info->sector_count = 67;
 390                 info->size = 0x00400000;
 391                 break;                          /* => 4 MB              */
 392
 393         case (FLASH_WORD_SIZE)AMD_ID_LV320B:
 394                 info->flash_id += FLASH_AM320B;
 395                 info->sector_count = 67;
 396                 info->size = 0x00400000;
 397                 break;                          /* => 4 MB              */
 398 #endif
 399         case (FLASH_WORD_SIZE)SST_ID_xF800A:
 400                 info->flash_id += FLASH_SST800A;
 401                 info->sector_count = 16;
 402                 info->size = 0x00100000;
 403                 break;                          /* => 1 MB              */
 404
 405         case (FLASH_WORD_SIZE)SST_ID_xF160A:
 406                 info->flash_id += FLASH_SST160A;
 407                 info->sector_count = 32;
 408                 info->size = 0x00200000;
 409                 break;                          /* => 2 MB              */
 410
 411         default:
 412                 info->flash_id = FLASH_UNKNOWN;
 413                 return (0);                     /* => no or unknown flash */
 414
 415         }
 416
 417         /* set up sector start address table */
 418         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 419             (info->flash_id  == FLASH_AM040)){
 420             for (i = 0; i < info->sector_count; i++)
 421                 info->start[i] = base + (i * 0x00010000);
 422         } else {
 423             if (info->flash_id & FLASH_BTYPE) {
 424                 /* set sector offsets for bottom boot block type        */
 425                 info->start[0] = base + 0x00000000;
 426                 info->start[1] = base + 0x00004000;
 427                 info->start[2] = base + 0x00006000;
 428                 info->start[3] = base + 0x00008000;
 429                 for (i = 4; i < info->sector_count; i++) {
 430                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 431                 }
 432             } else {
 433                 /* set sector offsets for top boot block type           */
 434                 i = info->sector_count - 1;
 435                 info->start[i--] = base + info->size - 0x00004000;
 436                 info->start[i--] = base + info->size - 0x00006000;
 437                 info->start[i--] = base + info->size - 0x00008000;
 438                 for (; i >= 0; i--) {
 439                         info->start[i] = base + i * 0x00010000;
 440                 }
 441             }
 442         }
 443
 444         /* check for protected sectors */
 445         for (i = 0; i < info->sector_count; i++) {
 446                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 447                 /* D0 = 1 if protected */
 448 #ifdef CONFIG_ADCIOP
 449                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 450                 info->protect[i] = addr2[4] & 1;
 451 #else
 452                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 453                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 454                   info->protect[i] = 0;
 455                 else
 456                   info->protect[i] = addr2[2] & 1;
 457 #endif
 458         }
 459
 460         /*
 461          * Prevent writes to uninitialized FLASH.
 462          */
 463         if (info->flash_id != FLASH_UNKNOWN) {
 464 #if 0 /* test-only */
 465 #ifdef CONFIG_ADCIOP
 466                 addr2 = (volatile unsigned char *)info->start[0];
 467                 addr2[ADDR0] = 0xAA;
 468                 addr2[ADDR1] = 0x55;
 469                 addr2[ADDR0] = 0xF0;  /* reset bank */
 470 #else
 471                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 472                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 473 #endif
 474 #else /* test-only */
 475                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 476                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 477 #endif /* test-only */
 478         }
 479
 480         return (info->size);
 481 }
 482
 483 int wait_for_DQ7(flash_info_t *info, int sect)
 484 {
 485         ulong start, now, last;
 486         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
 487
 488         start = get_timer (0);
 489     last  = start;
 490     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 491         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 492             printf ("Timeout\n");
 493             return -1;
 494         }
 495         /* show that we're waiting */
 496         if ((now - last) > 1000) {  /* every second */
 497             putc ('.');
 498             last = now;
 499         }
 500     }
 501         return 0;
 502 }
 503
 504 /*-----------------------------------------------------------------------
 505  */
 506
 507 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 508 {
 509         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 510         volatile FLASH_WORD_SIZE *addr2;
 511         int flag, prot, sect, l_sect;
 512         int i;
 513
 514         if ((s_first < 0) || (s_first > s_last)) {
 515                 if (info->flash_id == FLASH_UNKNOWN) {
 516                         printf ("- missing\n");
 517                 } else {
 518                         printf ("- no sectors to erase\n");
 519                 }
 520                 return 1;
 521         }
 522
 523         if (info->flash_id == FLASH_UNKNOWN) {
 524                 printf ("Can't erase unknown flash type - aborted\n");
 525                 return 1;
 526         }
 527
 528         prot = 0;
 529         for (sect=s_first; sect<=s_last; ++sect) {
 530                 if (info->protect[sect]) {
 531                         prot++;
 532                 }
 533         }
 534
 535         if (prot) {
 536                 printf ("- Warning: %d protected sectors will not be erased!\n",
 537                         prot);
 538         } else {
 539                 printf ("\n");
 540         }
 541
 542         l_sect = -1;
 543
 544         /* Disable interrupts which might cause a timeout here */
 545         flag = disable_interrupts();
 546
 547         /* Start erase on unprotected sectors */
 548         for (sect = s_first; sect<=s_last; sect++) {
 549                 if (info->protect[sect] == 0) { /* not protected */
 550                     addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
 551                     printf("Erasing sector %p\n", addr2);       /* CLH */
 552
 553                     if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 554                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 555                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 556                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 557                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 558                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 559                         addr2[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 560                         for (i=0; i<50; i++)
 561                                 udelay(1000);  /* wait 1 ms */
 562                     } else {
 563                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 564                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 565                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 566                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 567                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 568                         addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 569                     }
 570                     l_sect = sect;
 571                     /*
 572                      * Wait for each sector to complete, it's more
 573                      * reliable.  According to AMD Spec, you must
 574                      * issue all erase commands within a specified
 575                      * timeout.  This has been seen to fail, especially
 576                      * if printf()s are included (for debug)!!
 577                      */
 578                     wait_for_DQ7(info, sect);
 579                 }
 580         }
 581
 582         /* re-enable interrupts if necessary */
 583         if (flag)
 584                 enable_interrupts();
 585
 586         /* wait at least 80us - let's wait 1 ms */
 587         udelay (1000);
 588
 589 #if 0
 590         /*
 591          * We wait for the last triggered sector
 592          */
 593         if (l_sect < 0)
 594                 goto DONE;
 595         wait_for_DQ7(info, l_sect);
 596
 597 DONE:
 598 #endif
 599         /* reset to read mode */
 600         addr = (FLASH_WORD_SIZE *)info->start[0];
 601         addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
 602
 603         printf (" done\n");
 604         return 0;
 605 }
 606
 607 /*-----------------------------------------------------------------------
 608  * Copy memory to flash, returns:
 609  * 0 - OK
 610  * 1 - write timeout
 611  * 2 - Flash not erased
 612  */
 613
 614 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 615 {
 616         ulong cp, wp, data;
 617         int i, l, rc;
 618
 619         wp = (addr & ~3);       /* get lower word aligned address */
 620
 621         /*
 622          * handle unaligned start bytes
 623          */
 624         if ((l = addr - wp) != 0) {
 625                 data = 0;
 626                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 627                         data = (data << 8) | (*(uchar *)cp);
 628                 }
 629                 for (; i<4 && cnt>0; ++i) {
 630                         data = (data << 8) | *src++;
 631                         --cnt;
 632                         ++cp;
 633                 }
 634                 for (; cnt==0 && i<4; ++i, ++cp) {
 635                         data = (data << 8) | (*(uchar *)cp);
 636                 }
 637
 638                 if ((rc = write_word(info, wp, data)) != 0) {
 639                         return (rc);
 640                 }
 641                 wp += 4;
 642         }
 643
 644         /*
 645          * handle word aligned part
 646          */
 647         while (cnt >= 4) {
 648                 data = 0;
 649                 for (i=0; i<4; ++i) {
 650                         data = (data << 8) | *src++;
 651                 }
 652                 if ((rc = write_word(info, wp, data)) != 0) {
 653                         return (rc);
 654                 }
 655                 wp  += 4;
 656                 cnt -= 4;
 657         }
 658
 659         if (cnt == 0) {
 660                 return (0);
 661         }
 662
 663         /*
 664          * handle unaligned tail bytes
 665          */
 666         data = 0;
 667         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 668                 data = (data << 8) | *src++;
 669                 --cnt;
 670         }
 671         for (; i<4; ++i, ++cp) {
 672                 data = (data << 8) | (*(uchar *)cp);
 673         }
 674
 675         return (write_word(info, wp, data));
 676 }
 677
 678 /*-----------------------------------------------------------------------
 679  * Write a word to Flash, returns:
 680  * 0 - OK
 681  * 1 - write timeout
 682  * 2 - Flash not erased
 683  */
 684 static int write_word (flash_info_t * info, ulong dest, ulong data)
 685 {
 686         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 687         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 688         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 689         ulong start;
 690         int i;
 691
 692         /* Check if Flash is (sufficiently) erased */
 693         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 694             (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 695                 return (2);
 696         }
 697
 698         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 699                 int flag;
 700
 701                 /* Disable interrupts which might cause a timeout here */
 702                 flag = disable_interrupts ();
 703
 704                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 705                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 706                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 707
 708                 dest2[i] = data2[i];
 709
 710                 /* re-enable interrupts if necessary */
 711                 if (flag)
 712                         enable_interrupts ();
 713
 714                 /* data polling for D7 */
 715                 start = get_timer (0);
 716                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 717                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 718
 719                         if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 720                                 return (1);
 721                         }
 722                 }
 723         }
 724
 725         return (0);
 726 }
 727
 728 /*-----------------------------------------------------------------------
 729  */