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