board/mvs1/flash.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Changes for MATRIX Vision MVsensor (C) Copyright 2001
   6  * MATRIX Vision GmbH / hg, info@matrix-vision.de
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <mpc8xx.h>
  29
  30 #undef MVDEBUG
  31 #ifdef MVDEBUG
  32 #define mvdebug debug
  33 #else
  34 #define mvdebug(p) do {} while (0)
  35 #endif
  36
  37
  38 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  39
  40
  41 #ifdef CONFIG_MVS_16BIT_FLASH
  42         #define FLASH_DATA_MASK 0xffff
  43         #define FLASH_SHIFT 0
  44 #else
  45         #define FLASH_DATA_MASK 0xffffffff
  46         #define FLASH_SHIFT 1
  47 #endif
  48
  49
  50 /*-----------------------------------------------------------------------
  51  * Functions
  52  */
  53 static ulong flash_get_size (vu_long *address, flash_info_t *info);
  54 static int write_word (flash_info_t *info, ulong dest, ulong data);
  55 static void flash_get_offsets (ulong base, flash_info_t *info);
  56
  57 /*-----------------------------------------------------------------------
  58  */
  59
  60 unsigned long flash_init (void)
  61 {
  62         volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  63         volatile memctl8xx_t *memctl = &immap->im_memctl;
  64         unsigned long size_b0, size_b1;
  65         int i;
  66
  67         /* Init: no FLASHes known */
  68         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  69                 flash_info[i].flash_id = FLASH_UNKNOWN;
  70         }
  71
  72         /* Static FLASH Bank configuration here - FIXME XXX */
  73
  74         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  75
  76         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  77                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  78                         size_b0, size_b0<<20);
  79         }
  80
  81 #if defined (FLASH_BASE1_PRELIM)
  82         size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
  83
  84         if (size_b1 > size_b0) {
  85                 printf ("## ERROR: "
  86                         "Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
  87                         size_b1, size_b1<<20,
  88                         size_b0, size_b0<<20
  89                 );
  90                 flash_info[0].flash_id  = FLASH_UNKNOWN;
  91                 flash_info[1].flash_id  = FLASH_UNKNOWN;
  92                 flash_info[0].sector_count      = -1;
  93                 flash_info[1].sector_count      = -1;
  94                 flash_info[0].size              = 0;
  95                 flash_info[1].size              = 0;
  96                 return (0);
  97         }
  98 #else
  99         size_b1 = 0;
 100 #endif
 101
 102         /* Remap FLASH according to real size */
 103         memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
 104 #ifdef CONFIG_MVS_16BIT_FLASH
 105         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_16 | BR_MS_GPCM | BR_V;
 106 #else
 107         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_32 | BR_MS_GPCM | BR_V;
 108 #endif
 109
 110         /* Re-do sizing to get full correct info */
 111         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
 112
 113         flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
 114
 115         /* monitor protection ON by default */
 116         flash_protect(FLAG_PROTECT_SET,
 117                       CFG_FLASH_BASE,
 118                       CFG_FLASH_BASE+monitor_flash_len-1,
 119                       &flash_info[0]);
 120
 121         if (size_b1) {
 122                 memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 123 #ifdef CONFIG_MVS_16BIT_FLASH
 124                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 125                                     BR_PS_16 | BR_MS_GPCM | BR_V;
 126 #else
 127                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 128                                     BR_PS_32 | BR_MS_GPCM | BR_V;
 129 #endif
 130                 /* Re-do sizing to get full correct info */
 131                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 132                                           &flash_info[1]);
 133
 134                 flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);
 135
 136                 /* monitor protection ON by default */
 137                 flash_protect(FLAG_PROTECT_SET,
 138                               CFG_FLASH_BASE,
 139                               CFG_FLASH_BASE+monitor_flash_len-1,
 140                               &flash_info[1]);
 141         } else {
 142                 memctl->memc_br1 = 0;           /* invalidate bank */
 143
 144                 flash_info[1].flash_id = FLASH_UNKNOWN;
 145                 flash_info[1].sector_count = -1;
 146         }
 147
 148         flash_info[0].size = size_b0;
 149         flash_info[1].size = size_b1;
 150
 151         return (size_b0 + size_b1);
 152 }
 153
 154 /*-----------------------------------------------------------------------
 155  */
 156 static void flash_get_offsets (ulong base, flash_info_t *info)
 157 {
 158         int i;
 159
 160         /* set up sector start address table */
 161         if (info->flash_id & FLASH_BTYPE)
 162         {       /* bottom boot sector types - these are the useful ones! */
 163                 /* set sector offsets for bottom boot block type */
 164                 if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320B)
 165                 {       /* AMDLV320B has 8 x 8k bottom boot sectors */
 166                         for (i = 0; i < 8; i++)                                                                                         /* +8k          */
 167                                 info->start[i] = base + (i * (0x00002000 << FLASH_SHIFT));
 168                         for (; i < info->sector_count; i++)                                                                     /* +64k         */
 169                                 info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT)) - (0x00070000 << FLASH_SHIFT);
 170                 }
 171                 else
 172                 {       /* other types have 4 bottom boot sectors (16,8,8,32) */
 173                         i = 0;
 174                         info->start[i++] = base +  0x00000000;                                                          /* -            */
 175                         info->start[i++] = base + (0x00004000 << FLASH_SHIFT);                          /* +16k         */
 176                         info->start[i++] = base + (0x00006000 << FLASH_SHIFT);                          /* +8k          */
 177                         info->start[i++] = base + (0x00008000 << FLASH_SHIFT);                          /* +8k          */
 178                         info->start[i++] = base + (0x00010000 << FLASH_SHIFT);                          /* +32k         */
 179                         for (; i < info->sector_count; i++)                                                                     /* +64k         */
 180                                 info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT)) - (0x00030000 << FLASH_SHIFT);
 181                 }
 182         }
 183         else
 184         {       /* top boot sector types - not so useful */
 185                 /* set sector offsets for top boot block type */
 186                 if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM320T)
 187                 {       /* AMDLV320T has 8 x 8k top boot sectors */
 188                         for (i = 0; i < info->sector_count - 8; i++)                                            /* +64k         */
 189                                 info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT));
 190                         for (; i < info->sector_count; i++)                                                                     /* +8k          */
 191                                 info->start[i] = base + (i * (0x00002000 << FLASH_SHIFT));
 192                 }
 193                 else
 194                 {       /* other types have 4 top boot sectors (32,8,8,16) */
 195                         for (i = 0; i < info->sector_count - 4; i++)                                            /* +64k         */
 196                                 info->start[i] = base + (i * (0x00010000 << FLASH_SHIFT));
 197
 198                         info->start[i++] = base + info->size - (0x00010000 << FLASH_SHIFT);     /* -32k         */
 199                         info->start[i++] = base + info->size - (0x00008000 << FLASH_SHIFT);     /* -8k          */
 200                         info->start[i++] = base + info->size - (0x00006000 << FLASH_SHIFT);     /* -8k          */
 201                         info->start[i]   = base + info->size - (0x00004000 << FLASH_SHIFT);     /* -16k         */
 202                 }
 203         }
 204 }
 205
 206 /*-----------------------------------------------------------------------
 207  */
 208 void flash_print_info  (flash_info_t *info)
 209 {
 210         int i;
 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_STM:     printf ("ST ");                 break;
 221         default:                printf ("Unknown Vendor ");     break;
 222         }
 223
 224         switch (info->flash_id & FLASH_TYPEMASK) {
 225         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 226                                 break;
 227         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 228                                 break;
 229         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 230                                 break;
 231         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 232                                 break;
 233         case FLASH_STMW320DB:   printf ("M29W320B (32 Mbit, bottom boot sect)\n");
 234                                 break;
 235         case FLASH_STMW320DT:   printf ("M29W320T (32 Mbit, top boot sector)\n");
 236                                 break;
 237         default:                printf ("Unknown Chip Type\n");
 238                                 break;
 239         }
 240
 241         printf ("  Size: %ld MB in %d Sectors\n",
 242                 info->size >> 20, info->sector_count);
 243
 244         printf ("  Sector Start Addresses:");
 245         for (i=0; i<info->sector_count; ++i) {
 246                 if ((i % 5) == 0)
 247                         printf ("\n   ");
 248                 printf (" %08lX%s",
 249                         info->start[i],
 250                         info->protect[i] ? " (RO)" : "     "
 251                 );
 252         }
 253         printf ("\n");
 254 }
 255
 256 /*-----------------------------------------------------------------------
 257  */
 258
 259
 260 /*-----------------------------------------------------------------------
 261  */
 262
 263 /*
 264  * The following code cannot be run from FLASH!
 265  */
 266
 267 #define AMD_ID_LV160T_MVS       (AMD_ID_LV160T & FLASH_DATA_MASK)
 268 #define AMD_ID_LV160B_MVS       (AMD_ID_LV160B & FLASH_DATA_MASK)
 269 #define AMD_ID_LV320T_MVS       (AMD_ID_LV320T & FLASH_DATA_MASK)
 270 #define AMD_ID_LV320B_MVS       (AMD_ID_LV320B & FLASH_DATA_MASK)
 271 #define STM_ID_W320DT_MVS       (STM_ID_29W320DT & FLASH_DATA_MASK)
 272 #define STM_ID_W320DB_MVS       (STM_ID_29W320DB & FLASH_DATA_MASK)
 273 #define AMD_MANUFACT_MVS        (AMD_MANUFACT  & FLASH_DATA_MASK)
 274 #define FUJ_MANUFACT_MVS        (FUJ_MANUFACT  & FLASH_DATA_MASK)
 275 #define STM_MANUFACT_MVS        (STM_MANUFACT  & FLASH_DATA_MASK)
 276
 277 #define AUTOSELECT_ADDR1        0x0555
 278 #define AUTOSELECT_ADDR2        0x02AA
 279 #define AUTOSELECT_ADDR3        AUTOSELECT_ADDR1
 280
 281 #define AUTOSELECT_DATA1        (0x00AA00AA & FLASH_DATA_MASK)
 282 #define AUTOSELECT_DATA2        (0x00550055 & FLASH_DATA_MASK)
 283 #define AUTOSELECT_DATA3        (0x00900090 & FLASH_DATA_MASK)
 284
 285 #define RESET_BANK_DATA         (0x00F000F0 & FLASH_DATA_MASK)
 286
 287 static ulong flash_get_size (vu_long *address, flash_info_t *info)
 288 {
 289         short i;
 290 #ifdef CONFIG_MVS_16BIT_FLASH
 291         ushort value;
 292         vu_short *addr = (vu_short *)address;
 293 #else
 294         ulong value;
 295         vu_long *addr = (vu_long *)address;
 296 #endif
 297         ulong base = (ulong)address;
 298
 299         /* Write auto select command: read Manufacturer ID */
 300         addr[AUTOSELECT_ADDR1] = AUTOSELECT_DATA1;
 301         addr[AUTOSELECT_ADDR2] = AUTOSELECT_DATA2;
 302         addr[AUTOSELECT_ADDR3] = AUTOSELECT_DATA3;
 303
 304         value = addr[0];                        /* manufacturer ID      */
 305         switch (value) {
 306         case AMD_MANUFACT_MVS:
 307                 info->flash_id = FLASH_MAN_AMD;
 308                 break;
 309         case FUJ_MANUFACT_MVS:
 310                 info->flash_id = FLASH_MAN_FUJ;
 311                 break;
 312         case STM_MANUFACT_MVS:
 313                 info->flash_id = FLASH_MAN_STM;
 314                 break;
 315         default:
 316                 info->flash_id = FLASH_UNKNOWN;
 317                 info->sector_count = 0;
 318                 info->size = 0;
 319                 return (0);                     /* no or unknown flash  */
 320         }
 321
 322         value = addr[1];                        /* device ID            */
 323         switch (value) {
 324         case AMD_ID_LV160T_MVS:
 325                 info->flash_id += FLASH_AM160T;
 326                 info->sector_count = 37;
 327                 info->size = (0x00200000 << FLASH_SHIFT);
 328                 break;                          /* => 2 or 4 MB         */
 329
 330         case AMD_ID_LV160B_MVS:
 331                 info->flash_id += FLASH_AM160B;
 332                 info->sector_count = 37;
 333                 info->size = (0x00200000 << FLASH_SHIFT);
 334                 break;                          /* => 2 or 4 MB         */
 335
 336         case AMD_ID_LV320T_MVS:
 337                 info->flash_id += FLASH_AM320T;
 338                 info->sector_count = 71;
 339                 info->size = (0x00400000 << FLASH_SHIFT);
 340                 break;                          /* => 4 or 8 MB         */
 341
 342         case AMD_ID_LV320B_MVS:
 343                 info->flash_id += FLASH_AM320B;
 344                 info->sector_count = 71;
 345                 info->size = (0x00400000 << FLASH_SHIFT);
 346                 break;                          /* => 4 or 8MB          */
 347
 348         case STM_ID_W320DT_MVS:
 349                 info->flash_id += FLASH_STMW320DT;
 350                 info->sector_count = 67;
 351                 info->size = (0x00400000 << FLASH_SHIFT);
 352                 break;                          /* => 4 or 8 MB         */
 353
 354         case STM_ID_W320DB_MVS:
 355                 info->flash_id += FLASH_STMW320DB;
 356                 info->sector_count = 67;
 357                 info->size = (0x00400000 << FLASH_SHIFT);
 358                 break;                          /* => 4 or 8MB          */
 359
 360         default:
 361                 info->flash_id = FLASH_UNKNOWN;
 362                 return (0);                     /* => no or unknown flash */
 363
 364         }
 365
 366         /* set up sector start address table */
 367         flash_get_offsets (base, info);
 368
 369         /* check for protected sectors */
 370         for (i = 0; i < info->sector_count; i++) {
 371                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 372                 /* D0 = 1 if protected */
 373 #ifdef CONFIG_MVS_16BIT_FLASH
 374                 addr = (vu_short *)(info->start[i]);
 375 #else
 376                 addr = (vu_long *)(info->start[i]);
 377 #endif
 378                 info->protect[i] = addr[2] & 1;
 379         }
 380
 381         /*
 382          * Prevent writes to uninitialized FLASH.
 383          */
 384         if (info->flash_id != FLASH_UNKNOWN) {
 385 #ifdef CONFIG_MVS_16BIT_FLASH
 386                 addr = (vu_short *)info->start[0];
 387 #else
 388                 addr = (vu_long *)info->start[0];
 389 #endif
 390                 *addr = RESET_BANK_DATA;        /* reset bank */
 391         }
 392
 393         return (info->size);
 394 }
 395
 396
 397 /*-----------------------------------------------------------------------
 398  */
 399
 400 #define ERASE_ADDR1 0x0555
 401 #define ERASE_ADDR2 0x02AA
 402 #define ERASE_ADDR3 ERASE_ADDR1
 403 #define ERASE_ADDR4 ERASE_ADDR1
 404 #define ERASE_ADDR5 ERASE_ADDR2
 405
 406 #define ERASE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)
 407 #define ERASE_DATA2 (0x00550055 & FLASH_DATA_MASK)
 408 #define ERASE_DATA3 (0x00800080 & FLASH_DATA_MASK)
 409 #define ERASE_DATA4 ERASE_DATA1
 410 #define ERASE_DATA5 ERASE_DATA2
 411
 412 #define ERASE_SECTOR_DATA (0x00300030 & FLASH_DATA_MASK)
 413 #define ERASE_CHIP_DATA (0x00100010 & FLASH_DATA_MASK)
 414 #define ERASE_CONFIRM_DATA (0x00800080 & FLASH_DATA_MASK)
 415
 416 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 417 {
 418 #ifdef CONFIG_MVS_16BIT_FLASH
 419         vu_short *addr = (vu_short *)(info->start[0]);
 420 #else
 421         vu_long *addr = (vu_long *)(info->start[0]);
 422 #endif
 423         int flag, prot, sect, l_sect;
 424         ulong start, now, last;
 425
 426         if ((s_first < 0) || (s_first > s_last)) {
 427                 if (info->flash_id == FLASH_UNKNOWN) {
 428                         printf ("- missing\n");
 429                 } else {
 430                         printf ("- no sectors to erase\n");
 431                 }
 432                 return 1;
 433         }
 434
 435         if ((info->flash_id == FLASH_UNKNOWN) ||
 436             (info->flash_id > FLASH_AMD_COMP)) {
 437                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 438                         info->flash_id);
 439                 return 1;
 440         }
 441
 442         prot = 0;
 443         for (sect=s_first; sect<=s_last; ++sect) {
 444                 if (info->protect[sect]) {
 445                         prot++;
 446                 }
 447         }
 448
 449         if (prot) {
 450                 printf ("- Warning: %d protected sectors will not be erased!\n",
 451                         prot);
 452         } else {
 453                 printf ("\n");
 454         }
 455
 456         l_sect = -1;
 457
 458         /* Disable interrupts which might cause a timeout here */
 459         flag = disable_interrupts();
 460
 461         addr[ERASE_ADDR1] = ERASE_DATA1;
 462         addr[ERASE_ADDR2] = ERASE_DATA2;
 463         addr[ERASE_ADDR3] = ERASE_DATA3;
 464         addr[ERASE_ADDR4] = ERASE_DATA4;
 465         addr[ERASE_ADDR5] = ERASE_DATA5;
 466
 467         /* Start erase on unprotected sectors */
 468         for (sect = s_first; sect<=s_last; sect++) {
 469                 if (info->protect[sect] == 0) { /* not protected */
 470 #ifdef CONFIG_MVS_16BIT_FLASH
 471                         addr = (vu_short *)(info->start[sect]);
 472 #else
 473                         addr = (vu_long *)(info->start[sect]);
 474 #endif
 475                         addr[0] = ERASE_SECTOR_DATA;
 476                         l_sect = sect;
 477                 }
 478         }
 479
 480         /* re-enable interrupts if necessary */
 481         if (flag)
 482                 enable_interrupts();
 483
 484         /* wait at least 80us - let's wait 1 ms */
 485         udelay (1000);
 486
 487         /*
 488          * We wait for the last triggered sector
 489          */
 490         if (l_sect < 0)
 491                 goto DONE;
 492
 493         start = get_timer (0);
 494         last  = start;
 495 #ifdef CONFIG_MVS_16BIT_FLASH
 496         addr = (vu_short *)(info->start[l_sect]);
 497 #else
 498         addr = (vu_long *)(info->start[l_sect]);
 499 #endif
 500         while ((addr[0] & ERASE_CONFIRM_DATA) != ERASE_CONFIRM_DATA) {
 501                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 502                         printf ("Timeout\n");
 503                         return 1;
 504                 }
 505                 /* show that we're waiting */
 506                 if ((now - last) > 1000) {      /* every second */
 507                         putc ('.');
 508                         last = now;
 509                 }
 510         }
 511
 512 DONE:
 513         /* reset to read mode */
 514 #ifdef CONFIG_MVS_16BIT_FLASH
 515         addr = (vu_short *)info->start[0];
 516 #else
 517         addr = (vu_long *)info->start[0];
 518 #endif
 519         addr[0] = RESET_BANK_DATA;      /* reset bank */
 520
 521         printf (" done\n");
 522         return 0;
 523 }
 524
 525
 526 /*-----------------------------------------------------------------------
 527  * Copy memory to flash, returns:
 528  * 0 - OK
 529  * 1 - write timeout
 530  * 2 - Flash not erased
 531  */
 532
 533 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 534 {
 535 #define BUFF_INC 4
 536         ulong cp, wp, data;
 537         int i, l, rc;
 538
 539         mvdebug (("+write_buff %p ==> 0x%08lx, count = 0x%08lx\n", src, addr, cnt));
 540
 541         wp = (addr & ~3);       /* get lower word aligned address */
 542         /*
 543          * handle unaligned start bytes
 544          */
 545         if ((l = addr - wp) != 0) {
 546                 mvdebug ((" handle unaligned start bytes (cnt = 0x%08%lx)\n", cnt));
 547                 data = 0;
 548                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 549                         data = (data << 8) | (*(uchar *)cp);
 550                 }
 551                 for (; i<BUFF_INC && cnt>0; ++i) {
 552                         data = (data << 8) | *src++;
 553                         --cnt;
 554                         ++cp;
 555                 }
 556                 for (; cnt==0 && i<BUFF_INC; ++i, ++cp) {
 557                         data = (data << 8) | (*(uchar *)cp);
 558                 }
 559
 560                 if ((rc = write_word(info, wp, data)) != 0) {
 561                         return (rc);
 562                 }
 563                 wp += BUFF_INC;
 564         }
 565
 566         /*
 567          * handle (half)word aligned part
 568          */
 569         mvdebug ((" handle word aligned part (cnt = 0x%08%lx)\n", cnt));
 570         while (cnt >= BUFF_INC) {
 571                 data = 0;
 572                 for (i=0; i<BUFF_INC; ++i) {
 573                         data = (data << 8) | *src++;
 574                 }
 575                 if ((rc = write_word(info, wp, data)) != 0) {
 576                         return (rc);
 577                 }
 578                 wp  += BUFF_INC;
 579                 cnt -= BUFF_INC;
 580         }
 581
 582         if (cnt == 0) {
 583                 return (0);
 584         }
 585
 586         /*
 587          * handle unaligned tail bytes
 588          */
 589         mvdebug ((" handle unaligned tail bytes (cnt = 0x%08%lx)\n", cnt));
 590         data = 0;
 591         for (i=0, cp=wp; i<BUFF_INC && cnt>0; ++i, ++cp) {
 592                 data = (data << 8) | *src++;
 593                 --cnt;
 594         }
 595         for (; i<BUFF_INC; ++i, ++cp) {
 596                 data = (data << 8) | (*(uchar *)cp);
 597         }
 598
 599         return (write_word(info, wp, data));
 600 }
 601
 602 #define WRITE_ADDR1 0x0555
 603 #define WRITE_ADDR2 0x02AA
 604 #define WRITE_ADDR3 WRITE_ADDR1
 605
 606 #define WRITE_DATA1 (0x00AA00AA & FLASH_DATA_MASK)
 607 #define WRITE_DATA2 (0x00550055 & FLASH_DATA_MASK)
 608 #define WRITE_DATA3 (0x00A000A0 & FLASH_DATA_MASK)
 609
 610 #define WRITE_CONFIRM_DATA ERASE_CONFIRM_DATA
 611
 612 #ifndef CONFIG_MVS_16BIT_FLASH
 613 /*-----------------------------------------------------------------------
 614  * Write a word to Flash, returns:
 615  * 0 - OK
 616  * 1 - write timeout
 617  * 2 - Flash not erased
 618  */
 619 static int write_word (flash_info_t *info, ulong dest, ulong data)
 620 {
 621         vu_long *addr = (vu_long *)(info->start[0]);
 622         ulong start;
 623         int flag;
 624
 625         mvdebug (("+write_word (to 0x%08lx)\n", dest));
 626         /* Check if Flash is (sufficiently) erased */
 627         if ((*((vu_long *)dest) & data) != data) {
 628                 return (2);
 629         }
 630         /* Disable interrupts which might cause a timeout here */
 631         flag = disable_interrupts();
 632
 633         addr[WRITE_ADDR1] = WRITE_DATA1;
 634         addr[WRITE_ADDR2] = WRITE_DATA2;
 635         addr[WRITE_ADDR3] = WRITE_DATA3;
 636
 637         *((vu_long *)dest) = data;
 638
 639         /* re-enable interrupts if necessary */
 640         if (flag)
 641                 enable_interrupts();
 642
 643         /* data polling for D7 */
 644         start = get_timer (0);
 645         addr = (vu_long *)dest;
 646         while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {
 647                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 648                         return (1);
 649                 }
 650         }
 651
 652         mvdebug (("-write_word\n"));
 653         return (0);
 654 }
 655 #else /* CONFIG_MVS_16BIT_FLASH */
 656 /*-----------------------------------------------------------------------
 657  * Write a halfword to Flash, returns:
 658  * 0 - OK
 659  * 1 - write timeout
 660  * 2 - Flash not erased
 661  */
 662 static int write_halfword (flash_info_t *info, ulong dest, ushort data)
 663 {
 664         vu_short *addr = (vu_short *)(info->start[0]);
 665         ulong start;
 666         int flag;
 667
 668         mvdebug (("+write_halfword (to 0x%08lx)\n", dest));
 669         /* Check if Flash is (sufficiently) erased */
 670         if ((*((vu_short *)dest) & data) != data) {
 671                 return (2);
 672         }
 673         /* Disable interrupts which might cause a timeout here */
 674         flag = disable_interrupts();
 675
 676         addr[WRITE_ADDR1] = WRITE_DATA1;
 677         addr[WRITE_ADDR2] = WRITE_DATA2;
 678         addr[WRITE_ADDR3] = WRITE_DATA3;
 679
 680         *((vu_short *)dest) = data;
 681
 682         /* re-enable interrupts if necessary */
 683         if (flag)
 684                 enable_interrupts();
 685
 686         /* data polling for D7 */
 687         start = get_timer (0);
 688         addr = (vu_short *)dest;
 689         while ((*addr & WRITE_CONFIRM_DATA) != (data & WRITE_CONFIRM_DATA)) {
 690                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 691                         return (1);
 692                 }
 693         }
 694         mvdebug (("-write_halfword\n"));
 695         return (0);
 696 }
 697
 698
 699 /*-----------------------------------------------------------------------
 700  * Write a word to Flash, returns:
 701  * 0 - OK
 702  * 1 - write timeout
 703  * 2 - Flash not erased
 704  */
 705 static int write_word (flash_info_t *info, ulong dest, ulong data)
 706 {
 707         int result = 0;
 708
 709         if (write_halfword (info, dest, (data & ~FLASH_DATA_MASK) >> 16) == 0)
 710         {
 711                 dest += 2;
 712                 data = data & FLASH_DATA_MASK;
 713                 result = write_halfword (info, dest, data);
 714         }
 715         return result;
 716 }
 717 #endif
 718 /*-----------------------------------------------------------------------
 719  */