board/jse/flash.c

   1 /*
   2  * (C) Copyright 2000-2004
   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 #if CONFIG_SYS_MAX_FLASH_BANKS != 1
  36 #error "CONFIG_SYS_MAX_FLASH_BANKS must be 1"
  37 #endif
  38 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];    /* info for FLASH chips */
  39
  40 /*-----------------------------------------------------------------------
  41  * Functions
  42  */
  43 static ulong flash_get_size (vu_long * addr, flash_info_t * info);
  44 static int write_word (flash_info_t * info, ulong dest, ulong data);
  45 static void flash_get_offsets (ulong base, flash_info_t * info);
  46
  47 #define ADDR0           0x5555
  48 #define ADDR1           0x2aaa
  49 #define FLASH_WORD_SIZE unsigned char
  50
  51 /*-----------------------------------------------------------------------
  52  */
  53
  54 unsigned long flash_init (void)
  55 {
  56         unsigned long size_b0;
  57
  58         /* Init: no FLASHes known */
  59         flash_info[0].flash_id = FLASH_UNKNOWN;
  60
  61         /* Static FLASH Bank configuration here - FIXME XXX */
  62
  63         size_b0 = flash_get_size ((vu_long *) FLASH_BASE0_PRELIM, &flash_info[0]);
  64
  65         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  66                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  67                         size_b0, size_b0 << 20);
  68         }
  69
  70         /* Only one bank */
  71         /* Setup offsets */
  72         flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
  73
  74         /* Monitor protection ON by default */
  75         (void) flash_protect (FLAG_PROTECT_SET,
  76                               FLASH_BASE0_PRELIM,
  77                               FLASH_BASE0_PRELIM + monitor_flash_len - 1,
  78                               &flash_info[0]);
  79         flash_info[0].size = size_b0;
  80
  81         return size_b0;
  82 }
  83
  84
  85 /*-----------------------------------------------------------------------
  86  */
  87 /*
  88  * This implementation assumes that the flash chips are uniform sector
  89  * devices. This is true for all likely JSE devices.
  90  */
  91 static void flash_get_offsets (ulong base, flash_info_t * info)
  92 {
  93         unsigned idx;
  94         unsigned long sector_size = info->size / info->sector_count;
  95
  96         for (idx = 0; idx < info->sector_count; idx += 1) {
  97                 info->start[idx] = base + (idx * sector_size);
  98         }
  99 }
 100
 101 /*-----------------------------------------------------------------------
 102  */
 103 void flash_print_info (flash_info_t * info)
 104 {
 105         int i;
 106         int k;
 107         int size;
 108         int erased;
 109         volatile unsigned long *flash;
 110
 111         if (info->flash_id == FLASH_UNKNOWN) {
 112                 printf ("missing or unknown FLASH type\n");
 113                 return;
 114         }
 115
 116         switch (info->flash_id & FLASH_VENDMASK) {
 117         case FLASH_MAN_AMD:
 118                 printf ("AMD ");
 119                 break;
 120         case FLASH_MAN_FUJ:
 121                 printf ("FUJITSU ");
 122                 break;
 123         case FLASH_MAN_SST:
 124                 printf ("SST ");
 125                 break;
 126         case FLASH_MAN_STM:
 127                 printf ("ST Micro ");
 128                 break;
 129         default:
 130                 printf ("Unknown Vendor ");
 131                 break;
 132         }
 133
 134           /* (Reduced table of only parts expected in JSE boards.) */
 135         switch (info->flash_id) {
 136         case FLASH_MAN_AMD | FLASH_AM040:
 137                 printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 138                 break;
 139         case FLASH_MAN_STM | FLASH_AM040:
 140                 printf ("MM29W040W (512 Kbit, uniform sector size)\n");
 141                 break;
 142         default:
 143                 printf ("Unknown Chip Type\n");
 144                 break;
 145         }
 146
 147         printf ("  Size: %ld KB in %d Sectors\n",
 148                 info->size >> 10, info->sector_count);
 149
 150         printf ("  Sector Start Addresses:");
 151         for (i = 0; i < info->sector_count; ++i) {
 152                 /*
 153                  * Check if whole sector is erased
 154                  */
 155                 if (i != (info->sector_count - 1))
 156                         size = info->start[i + 1] - info->start[i];
 157                 else
 158                         size = info->start[0] + info->size - info->start[i];
 159                 erased = 1;
 160                 flash = (volatile unsigned long *) info->start[i];
 161                 size = size >> 2;       /* divide by 4 for longword access */
 162                 for (k = 0; k < size; k++) {
 163                         if (*flash++ != 0xffffffff) {
 164                                 erased = 0;
 165                                 break;
 166                         }
 167                 }
 168
 169                 if ((i % 5) == 0)
 170                         printf ("\n   ");
 171                 printf (" %08lX%s%s",
 172                         info->start[i],
 173                         erased ? " E" : "  ", info->protect[i] ? "RO " : "   "
 174                 );
 175         }
 176         printf ("\n");
 177         return;
 178 }
 179
 180 /*-----------------------------------------------------------------------
 181  */
 182
 183
 184 /*-----------------------------------------------------------------------
 185  */
 186
 187 /*
 188  * The following code cannot be run from FLASH!
 189  */
 190 static ulong flash_get_size (vu_long * addr, flash_info_t * info)
 191 {
 192         short i;
 193         FLASH_WORD_SIZE value;
 194         ulong base = (ulong) addr;
 195         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;
 196
 197         /* Write auto select command: read Manufacturer ID */
 198         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 199         addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 200         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
 201
 202         value = addr2[0];
 203
 204         switch (value) {
 205         case (FLASH_WORD_SIZE) AMD_MANUFACT:
 206                 info->flash_id = FLASH_MAN_AMD;
 207                 break;
 208         case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 209                 info->flash_id = FLASH_MAN_FUJ;
 210                 break;
 211         case (FLASH_WORD_SIZE) SST_MANUFACT:
 212                 info->flash_id = FLASH_MAN_SST;
 213                 break;
 214         case (FLASH_WORD_SIZE)STM_MANUFACT:
 215                 info->flash_id = FLASH_MAN_STM;
 216                 break;
 217         default:
 218                 info->flash_id = FLASH_UNKNOWN;
 219                 info->sector_count = 0;
 220                 info->size = 0;
 221                 printf("Unknown flash manufacturer code: 0x%x\n", value);
 222                 return (0);     /* no or unknown flash  */
 223         }
 224
 225         value = addr2[1];       /* device ID            */
 226
 227         switch (value) {
 228         case (FLASH_WORD_SIZE) AMD_ID_F040B:
 229                 info->flash_id += FLASH_AM040;
 230                 info->sector_count = 8;
 231                 info->size = 0x0080000; /* => 512 ko */
 232                 break;
 233         case (FLASH_WORD_SIZE) AMD_ID_LV040B:
 234                 info->flash_id += FLASH_AM040;
 235                 info->sector_count = 8;
 236                 info->size = 0x0080000; /* => 512 ko */
 237                 break;
 238         case (FLASH_WORD_SIZE)STM_ID_M29W040B: /* most likele JSE chip */
 239                 info->flash_id += FLASH_AM040;
 240                 info->sector_count = 8;
 241                 info->size = 0x0080000; /* => 512 ko */
 242                 break;
 243         default:
 244                 info->flash_id = FLASH_UNKNOWN;
 245                 return (0);     /* => no or unknown flash */
 246
 247         }
 248
 249           /* Calculate the sector offsets (Use JSE Optimized code). */
 250         flash_get_offsets(base, info);
 251
 252         /* check for protected sectors */
 253         for (i = 0; i < info->sector_count; i++) {
 254                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 255                 /* D0 = 1 if protected */
 256                 addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 257                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 258                         info->protect[i] = 0;
 259                 else
 260                         info->protect[i] = addr2[2] & 1;
 261         }
 262
 263         /*
 264          * Prevent writes to uninitialized FLASH.
 265          */
 266         if (info->flash_id != FLASH_UNKNOWN) {
 267                 addr2 = (FLASH_WORD_SIZE *) info->start[0];
 268                 *addr2 = (FLASH_WORD_SIZE) 0x00F000F0;  /* reset bank */
 269         }
 270
 271         return (info->size);
 272 }
 273
 274 int wait_for_DQ7 (flash_info_t * info, int sect)
 275 {
 276         ulong start, now, last;
 277         volatile FLASH_WORD_SIZE *addr =
 278                 (FLASH_WORD_SIZE *) (info->start[sect]);
 279
 280         start = get_timer (0);
 281         last = start;
 282         while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 283                (FLASH_WORD_SIZE) 0x00800080) {
 284                 if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 285                         printf ("Timeout\n");
 286                         return -1;
 287                 }
 288                 /* show that we're waiting */
 289                 if ((now - last) > 1000) {      /* every second */
 290                         putc ('.');
 291                         last = now;
 292                 }
 293         }
 294         return 0;
 295 }
 296
 297 /*-----------------------------------------------------------------------
 298  */
 299
 300 int flash_erase (flash_info_t * info, int s_first, int s_last)
 301 {
 302         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 303         volatile FLASH_WORD_SIZE *addr2;
 304         int flag, prot, sect, l_sect;
 305         int i;
 306
 307         if ((s_first < 0) || (s_first > s_last)) {
 308                 if (info->flash_id == FLASH_UNKNOWN) {
 309                         printf ("- missing\n");
 310                 } else {
 311                         printf ("- no sectors to erase\n");
 312                 }
 313                 return 1;
 314         }
 315
 316         if (info->flash_id == FLASH_UNKNOWN) {
 317                 printf ("Can't erase unknown flash type - aborted\n");
 318                 return 1;
 319         }
 320
 321         prot = 0;
 322         for (sect = s_first; sect <= s_last; ++sect) {
 323                 if (info->protect[sect]) {
 324                         prot++;
 325                 }
 326         }
 327
 328         if (prot) {
 329                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 330         } else {
 331                 printf ("\n");
 332         }
 333
 334         l_sect = -1;
 335
 336         /* Disable interrupts which might cause a timeout here */
 337         flag = disable_interrupts ();
 338
 339         /* Start erase on unprotected sectors */
 340         for (sect = s_first; sect <= s_last; sect++) {
 341                 if (info->protect[sect] == 0) { /* not protected */
 342                         addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
 343                         printf ("Erasing sector %p\n", addr2);  /* CLH */
 344
 345                         if ((info->flash_id & FLASH_VENDMASK) ==
 346                             FLASH_MAN_SST) {
 347                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 348                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 349                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 350                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 351                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 352                                 addr2[0] = (FLASH_WORD_SIZE) 0x00500050;        /* block erase */
 353                                 for (i = 0; i < 50; i++)
 354                                         udelay (1000);  /* wait 1 ms */
 355                         } else {
 356                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 357                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 358                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 359                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 360                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 361                                 addr2[0] = (FLASH_WORD_SIZE) 0x00300030;        /* sector erase */
 362                         }
 363                         l_sect = sect;
 364                         /*
 365                          * Wait for each sector to complete, it's more
 366                          * reliable.  According to AMD Spec, you must
 367                          * issue all erase commands within a specified
 368                          * timeout.  This has been seen to fail, especially
 369                          * if printf()s are included (for debug)!!
 370                          */
 371                         wait_for_DQ7 (info, sect);
 372                 }
 373         }
 374
 375         /* re-enable interrupts if necessary */
 376         if (flag)
 377                 enable_interrupts ();
 378
 379         /* wait at least 80us - let's wait 1 ms */
 380         udelay (1000);
 381
 382 #if 0
 383         /*
 384          * We wait for the last triggered sector
 385          */
 386         if (l_sect < 0)
 387                 goto DONE;
 388         wait_for_DQ7 (info, l_sect);
 389
 390 DONE:
 391 #endif
 392         /* reset to read mode */
 393         addr = (FLASH_WORD_SIZE *) info->start[0];
 394         addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */
 395
 396         printf (" done\n");
 397         return 0;
 398 }
 399
 400 /*-----------------------------------------------------------------------
 401  * Copy memory to flash, returns:
 402  * 0 - OK
 403  * 1 - write timeout
 404  * 2 - Flash not erased
 405  */
 406
 407 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 408 {
 409         ulong cp, wp, data;
 410         int i, l, rc;
 411
 412         wp = (addr & ~3);       /* get lower word aligned address */
 413
 414         /*
 415          * handle unaligned start bytes
 416          */
 417         if ((l = addr - wp) != 0) {
 418                 data = 0;
 419                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 420                         data = (data << 8) | (*(uchar *) cp);
 421                 }
 422                 for (; i < 4 && cnt > 0; ++i) {
 423                         data = (data << 8) | *src++;
 424                         --cnt;
 425                         ++cp;
 426                 }
 427                 for (; cnt == 0 && i < 4; ++i, ++cp) {
 428                         data = (data << 8) | (*(uchar *) cp);
 429                 }
 430
 431                 if ((rc = write_word (info, wp, data)) != 0) {
 432                         return (rc);
 433                 }
 434                 wp += 4;
 435         }
 436
 437         /*
 438          * handle word aligned part
 439          */
 440         while (cnt >= 4) {
 441                 data = 0;
 442                 for (i = 0; i < 4; ++i) {
 443                         data = (data << 8) | *src++;
 444                 }
 445                 if ((rc = write_word (info, wp, data)) != 0) {
 446                         return (rc);
 447                 }
 448                 wp += 4;
 449                 cnt -= 4;
 450         }
 451
 452         if (cnt == 0) {
 453                 return (0);
 454         }
 455
 456         /*
 457          * handle unaligned tail bytes
 458          */
 459         data = 0;
 460         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 461                 data = (data << 8) | *src++;
 462                 --cnt;
 463         }
 464         for (; i < 4; ++i, ++cp) {
 465                 data = (data << 8) | (*(uchar *) cp);
 466         }
 467
 468         return (write_word (info, wp, data));
 469 }
 470
 471 /*-----------------------------------------------------------------------
 472  * Write a word to Flash, returns:
 473  * 0 - OK
 474  * 1 - write timeout
 475  * 2 - Flash not erased
 476  */
 477 static int write_word (flash_info_t * info, ulong dest, ulong data)
 478 {
 479         volatile FLASH_WORD_SIZE *addr2 =
 480                 (FLASH_WORD_SIZE *) (info->start[0]);
 481         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 482         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 483         ulong start;
 484         int i;
 485
 486         /* Check if Flash is (sufficiently) erased */
 487         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 488             (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 489                 return (2);
 490         }
 491
 492         for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 493                 int flag;
 494
 495                 /* Disable interrupts which might cause a timeout here */
 496                 flag = disable_interrupts ();
 497
 498                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 499                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 500                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 501
 502                 dest2[i] = data2[i];
 503
 504                 /* re-enable interrupts if necessary */
 505                 if (flag)
 506                         enable_interrupts ();
 507
 508                 /* data polling for D7 */
 509                 start = get_timer (0);
 510                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 511                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 512
 513                         if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 514                                 return (1);
 515                         }
 516                 }
 517         }
 518
 519         return (0);
 520 }