board/pm520/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
   4  *
   5  * (C) Copyright 2001-2004
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.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 <linux/byteorder/swab.h>
  29
  30
  31 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];   /* info for FLASH chips    */
  32
  33 /* Board support for 1 or 2 flash devices */
  34 #define FLASH_PORT_WIDTH32
  35 #undef FLASH_PORT_WIDTH16
  36
  37 #ifdef FLASH_PORT_WIDTH16
  38 #define FLASH_PORT_WIDTH                ushort
  39 #define FLASH_PORT_WIDTHV               vu_short
  40 #define SWAP(x)                         (x)
  41 #else
  42 #define FLASH_PORT_WIDTH                ulong
  43 #define FLASH_PORT_WIDTHV               vu_long
  44 #define SWAP(x)                         (x)
  45 #endif
  46
  47 /* Intel-compatible flash ID */
  48 #define INTEL_COMPAT  0x00890089
  49 #define INTEL_ALT     0x00B000B0
  50
  51 /* Intel-compatible flash commands */
  52 #define INTEL_PROGRAM 0x00100010
  53 #define INTEL_ERASE   0x00200020
  54 #define INTEL_CLEAR   0x00500050
  55 #define INTEL_LOCKBIT 0x00600060
  56 #define INTEL_PROTECT 0x00010001
  57 #define INTEL_STATUS  0x00700070
  58 #define INTEL_READID  0x00900090
  59 #define INTEL_CONFIRM 0x00D000D0
  60 #define INTEL_RESET   0xFFFFFFFF
  61
  62 /* Intel-compatible flash status bits */
  63 #define INTEL_FINISHED 0x00800080
  64 #define INTEL_OK       0x00800080
  65
  66 #define FPW        FLASH_PORT_WIDTH
  67 #define FPWV   FLASH_PORT_WIDTHV
  68
  69 #define mb() __asm__ __volatile__ ("" : : : "memory")
  70
  71 /*-----------------------------------------------------------------------
  72  * Functions
  73  */
  74 static ulong flash_get_size (FPW *addr, flash_info_t *info);
  75 static int write_data (flash_info_t *info, ulong dest, FPW data);
  76 static void flash_get_offsets (ulong base, flash_info_t *info);
  77 void inline spin_wheel (void);
  78 static void flash_sync_real_protect (flash_info_t * info);
  79 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);
  80
  81 /*-----------------------------------------------------------------------
  82  */
  83
  84 unsigned long flash_init (void)
  85 {
  86         int i;
  87         ulong size = 0;
  88         extern void flash_preinit(void);
  89         extern void flash_afterinit(ulong, ulong);
  90         ulong flashbase = CFG_FLASH_BASE;
  91
  92         flash_preinit();
  93
  94         for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
  95                 switch (i) {
  96                 case 0:
  97                         memset(&flash_info[i], 0, sizeof(flash_info_t));
  98                         flash_get_size ((FPW *) flashbase, &flash_info[i]);
  99                         flash_get_offsets (flash_info[i].start[0], &flash_info[i]);
 100                         break;
 101                 default:
 102                         panic ("configured to many flash banks!\n");
 103                         break;
 104                 }
 105                 size += flash_info[i].size;
 106
 107                 /* get the h/w and s/w protection status in sync */
 108                 flash_sync_real_protect(&flash_info[i]);
 109         }
 110
 111         /* Protect monitor and environment sectors
 112          */
 113 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 114 #ifndef CONFIG_BOOT_ROM
 115         flash_protect ( FLAG_PROTECT_SET,
 116                         CFG_MONITOR_BASE,
 117                         CFG_MONITOR_BASE + monitor_flash_len - 1,
 118                         &flash_info[0] );
 119 #endif
 120 #endif
 121
 122 #ifdef  CFG_ENV_IS_IN_FLASH
 123         flash_protect ( FLAG_PROTECT_SET,
 124                         CFG_ENV_ADDR,
 125                         CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0] );
 126 #endif
 127
 128         flash_afterinit(flash_info[0].start[0], flash_info[0].size);
 129
 130         return size;
 131 }
 132
 133 /*-----------------------------------------------------------------------
 134  */
 135 static void flash_get_offsets (ulong base, flash_info_t *info)
 136 {
 137         int i;
 138
 139         if (info->flash_id == FLASH_UNKNOWN) {
 140                 return;
 141         }
 142
 143         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
 144                 for (i = 0; i < info->sector_count; i++) {
 145                         info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
 146                 }
 147         }
 148 }
 149
 150 /*-----------------------------------------------------------------------
 151  */
 152 void flash_print_info (flash_info_t *info)
 153 {
 154         int i;
 155
 156         if (info->flash_id == FLASH_UNKNOWN) {
 157                 printf ("missing or unknown FLASH type\n");
 158                 return;
 159         }
 160
 161         switch (info->flash_id & FLASH_VENDMASK) {
 162         case FLASH_MAN_INTEL:
 163                 printf ("INTEL ");
 164                 break;
 165         default:
 166                 printf ("Unknown Vendor ");
 167                 break;
 168         }
 169
 170         switch (info->flash_id & FLASH_TYPEMASK) {
 171         case FLASH_28F256J3A:
 172                 printf ("28F256J3A\n");
 173                 break;
 174
 175         case FLASH_28F128J3A:
 176                 printf ("28F128J3A\n");
 177                 break;
 178
 179         case FLASH_28F640J3A:
 180                 printf ("28F640J3A\n");
 181                 break;
 182
 183         case FLASH_28F320J3A:
 184                 printf ("28F320J3A\n");
 185                 break;
 186
 187         default:
 188                 printf ("Unknown Chip Type\n");
 189                 break;
 190         }
 191
 192         printf ("  Size: %ld MB in %d Sectors\n",
 193                         info->size >> 20, info->sector_count);
 194
 195         printf ("  Sector Start Addresses:");
 196         for (i = 0; i < info->sector_count; ++i) {
 197                 if ((i % 5) == 0)
 198                         printf ("\n   ");
 199                 printf (" %08lX%s",
 200                         info->start[i],
 201                         info->protect[i] ? " (RO)" : "     ");
 202         }
 203         printf ("\n");
 204         return;
 205 }
 206
 207 /*
 208  * The following code cannot be run from FLASH!
 209  */
 210 static ulong flash_get_size (FPW *addr, flash_info_t *info)
 211 {
 212         volatile FPW value;
 213
 214         /* Write auto select command: read Manufacturer ID */
 215         addr[0x5555] = (FPW) 0x00AA00AA;
 216         addr[0x2AAA] = (FPW) 0x00550055;
 217         addr[0x5555] = (FPW) 0x00900090;
 218
 219         mb ();
 220         udelay(100);
 221
 222         value = addr[0];
 223
 224         switch (value) {
 225
 226         case (FPW) INTEL_MANUFACT:
 227                 info->flash_id = FLASH_MAN_INTEL;
 228                 break;
 229
 230         default:
 231                 info->flash_id = FLASH_UNKNOWN;
 232                 info->sector_count = 0;
 233                 info->size = 0;
 234                 addr[0] = (FPW) 0x00FF00FF;     /* restore read mode */
 235                 return (0);                     /* no or unknown flash  */
 236         }
 237
 238         mb ();
 239         value = addr[1];                        /* device ID        */
 240
 241         switch (value) {
 242
 243         case (FPW) INTEL_ID_28F256J3A:
 244                 info->flash_id += FLASH_28F256J3A;
 245                 /* In U-Boot we support only 32 MB (no bank-switching) */
 246                 info->sector_count = 256 / 2;
 247                 info->size =  0x04000000 / 2;
 248                 info->start[0] = CFG_FLASH_BASE + 0x02000000;
 249                 break;                          /* => 32 MB     */
 250
 251         case (FPW) INTEL_ID_28F128J3A:
 252                 info->flash_id += FLASH_28F128J3A;
 253                 info->sector_count = 128;
 254                 info->size = 0x02000000;
 255                 info->start[0] = CFG_FLASH_BASE + 0x02000000;
 256                 break;                          /* => 32 MB     */
 257
 258         case (FPW) INTEL_ID_28F640J3A:
 259                 info->flash_id += FLASH_28F640J3A;
 260                 info->sector_count = 64;
 261                 info->size = 0x01000000;
 262                 info->start[0] = CFG_FLASH_BASE + 0x03000000;
 263                 break;                          /* => 16 MB     */
 264
 265         case (FPW) INTEL_ID_28F320J3A:
 266                 info->flash_id += FLASH_28F320J3A;
 267                 info->sector_count = 32;
 268                 info->size = 0x800000;
 269                 info->start[0] = CFG_FLASH_BASE + 0x03800000;
 270                 break;                          /* => 8 MB     */
 271
 272         default:
 273                 info->flash_id = FLASH_UNKNOWN;
 274                 break;
 275         }
 276
 277         if (info->sector_count > CFG_MAX_FLASH_SECT) {
 278                 printf ("** ERROR: sector count %d > max (%d) **\n",
 279                         info->sector_count, CFG_MAX_FLASH_SECT);
 280                 info->sector_count = CFG_MAX_FLASH_SECT;
 281         }
 282
 283         addr[0] = (FPW) 0x00FF00FF;             /* restore read mode */
 284
 285         return (info->size);
 286 }
 287
 288
 289 /*
 290  * This function gets the u-boot flash sector protection status
 291  * (flash_info_t.protect[]) in sync with the sector protection
 292  * status stored in hardware.
 293  */
 294 static void flash_sync_real_protect (flash_info_t * info)
 295 {
 296         int i;
 297
 298         switch (info->flash_id & FLASH_TYPEMASK) {
 299
 300         case FLASH_28F256J3A:
 301         case FLASH_28F128J3A:
 302         case FLASH_28F640J3A:
 303         case FLASH_28F320J3A:
 304                 for (i = 0; i < info->sector_count; ++i) {
 305                         info->protect[i] = intel_sector_protected(info, i);
 306                 }
 307                 break;
 308         default:
 309                 /* no h/w protect support */
 310                 break;
 311         }
 312 }
 313
 314
 315 /*
 316  * checks if "sector" in bank "info" is protected. Should work on intel
 317  * strata flash chips 28FxxxJ3x in 8-bit mode.
 318  * Returns 1 if sector is protected (or timed-out while trying to read
 319  * protection status), 0 if it is not.
 320  */
 321 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
 322 {
 323         FPWV *addr;
 324         FPWV *lock_conf_addr;
 325         ulong start;
 326         unsigned char ret;
 327
 328         /*
 329          * first, wait for the WSM to be finished. The rationale for
 330          * waiting for the WSM to become idle for at most
 331          * CFG_FLASH_ERASE_TOUT is as follows. The WSM can be busy
 332          * because of: (1) erase, (2) program or (3) lock bit
 333          * configuration. So we just wait for the longest timeout of
 334          * the (1)-(3), i.e. the erase timeout.
 335          */
 336
 337         /* wait at least 35ns (W12) before issuing Read Status Register */
 338         udelay(1);
 339         addr = (FPWV *) info->start[sector];
 340         *addr = (FPW) INTEL_STATUS;
 341
 342         start = get_timer (0);
 343         while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
 344                 if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
 345                         *addr = (FPW) INTEL_RESET; /* restore read mode */
 346                         printf("WSM busy too long, can't get prot status\n");
 347                         return 1;
 348                 }
 349         }
 350
 351         /* issue the Read Identifier Codes command */
 352         *addr = (FPW) INTEL_READID;
 353
 354         /* wait at least 35ns (W12) before reading */
 355         udelay(1);
 356
 357         /* Intel example code uses offset of 2 for 16 bit flash */
 358         lock_conf_addr = (FPWV *) info->start[sector] + 2;
 359         ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;
 360
 361         /* put flash back in read mode */
 362         *addr = (FPW) INTEL_RESET;
 363
 364         return ret;
 365 }
 366
 367 /*-----------------------------------------------------------------------
 368  */
 369
 370 int flash_erase (flash_info_t *info, int s_first, int s_last)
 371 {
 372         int flag, prot, sect;
 373         ulong type, start, last;
 374         int rcode = 0;
 375
 376         if ((s_first < 0) || (s_first > s_last)) {
 377                 if (info->flash_id == FLASH_UNKNOWN) {
 378                         printf ("- missing\n");
 379                 } else {
 380                         printf ("- no sectors to erase\n");
 381                 }
 382                 return 1;
 383         }
 384
 385         type = (info->flash_id & FLASH_VENDMASK);
 386         if ((type != FLASH_MAN_INTEL)) {
 387                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 388                         info->flash_id);
 389                 return 1;
 390         }
 391
 392         prot = 0;
 393         for (sect = s_first; sect <= s_last; ++sect) {
 394                 if (info->protect[sect]) {
 395                         prot++;
 396                 }
 397         }
 398
 399         if (prot) {
 400                 printf ("- Warning: %d protected sectors will not be erased!\n",
 401                         prot);
 402         } else {
 403                 printf ("\n");
 404         }
 405
 406         start = get_timer (0);
 407         last = start;
 408
 409         /* Disable interrupts which might cause a timeout here */
 410         flag = disable_interrupts ();
 411
 412         /* Start erase on unprotected sectors */
 413         for (sect = s_first; sect <= s_last; sect++) {
 414                 if (info->protect[sect] == 0) { /* not protected */
 415                         FPWV *addr = (FPWV *) (info->start[sect]);
 416                         FPW status;
 417
 418                         printf ("Erasing sector %2d ... ", sect);
 419
 420                         /* arm simple, non interrupt dependent timer */
 421                         start = get_timer(0);
 422
 423                         *addr = (FPW) 0x00500050;       /* clear status register */
 424                         *addr = (FPW) 0x00200020;       /* erase setup */
 425                         *addr = (FPW) 0x00D000D0;       /* erase confirm */
 426
 427                         while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
 428                                 if (get_timer(start) > CFG_FLASH_ERASE_TOUT) {
 429                                         printf ("Timeout\n");
 430                                         *addr = (FPW) 0x00B000B0;       /* suspend erase     */
 431                                         *addr = (FPW) 0x00FF00FF;       /* reset to read mode */
 432                                         rcode = 1;
 433                                         break;
 434                                 }
 435                         }
 436
 437                         *addr = 0x00500050;     /* clear status register cmd.   */
 438                         *addr = 0x00FF00FF;     /* resest to read mode          */
 439
 440                         printf (" done\n");
 441                 }
 442         }
 443         return rcode;
 444 }
 445
 446 /*-----------------------------------------------------------------------
 447  * Copy memory to flash, returns:
 448  * 0 - OK
 449  * 1 - write timeout
 450  * 2 - Flash not erased
 451  * 4 - Flash not identified
 452  */
 453
 454 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 455 {
 456         ulong cp, wp;
 457         FPW data;
 458         int count, i, l, rc, port_width;
 459
 460         if (info->flash_id == FLASH_UNKNOWN) {
 461                 return 4;
 462         }
 463 /* get lower word aligned address */
 464 #ifdef FLASH_PORT_WIDTH16
 465         wp = (addr & ~1);
 466         port_width = 2;
 467 #else
 468         wp = (addr & ~3);
 469         port_width = 4;
 470 #endif
 471
 472         /*
 473          * handle unaligned start bytes
 474          */
 475         if ((l = addr - wp) != 0) {
 476                 data = 0;
 477                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 478                         data = (data << 8) | (*(uchar *) cp);
 479                 }
 480                 for (; i < port_width && cnt > 0; ++i) {
 481                         data = (data << 8) | *src++;
 482                         --cnt;
 483                         ++cp;
 484                 }
 485                 for (; cnt == 0 && i < port_width; ++i, ++cp) {
 486                         data = (data << 8) | (*(uchar *) cp);
 487                 }
 488
 489                 if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 490                         return (rc);
 491                 }
 492                 wp += port_width;
 493         }
 494
 495         /*
 496          * handle word aligned part
 497          */
 498         count = 0;
 499         while (cnt >= port_width) {
 500                 data = 0;
 501                 for (i = 0; i < port_width; ++i) {
 502                         data = (data << 8) | *src++;
 503                 }
 504                 if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 505                         return (rc);
 506                 }
 507                 wp += port_width;
 508                 cnt -= port_width;
 509                 if (count++ > 0x800) {
 510                         spin_wheel ();
 511                         count = 0;
 512                 }
 513         }
 514
 515         if (cnt == 0) {
 516                 return (0);
 517         }
 518
 519         /*
 520          * handle unaligned tail bytes
 521          */
 522         data = 0;
 523         for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
 524                 data = (data << 8) | *src++;
 525                 --cnt;
 526         }
 527         for (; i < port_width; ++i, ++cp) {
 528                 data = (data << 8) | (*(uchar *) cp);
 529         }
 530
 531         return (write_data (info, wp, SWAP (data)));
 532 }
 533
 534 /*-----------------------------------------------------------------------
 535  * Write a word or halfword to Flash, returns:
 536  * 0 - OK
 537  * 1 - write timeout
 538  * 2 - Flash not erased
 539  */
 540 static int write_data (flash_info_t *info, ulong dest, FPW data)
 541 {
 542         FPWV *addr = (FPWV *) dest;
 543         ulong status;
 544         ulong start;
 545         int flag;
 546
 547         /* Check if Flash is (sufficiently) erased */
 548         if ((*addr & data) != data) {
 549                 printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
 550                 return (2);
 551         }
 552         /* Disable interrupts which might cause a timeout here */
 553         flag = disable_interrupts ();
 554
 555         *addr = (FPW) 0x00400040;       /* write setup */
 556         *addr = data;
 557
 558         /* arm simple, non interrupt dependent timer */
 559         start = get_timer(0);
 560
 561         /* wait while polling the status register */
 562         while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
 563                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 564                         *addr = (FPW) 0x00FF00FF;       /* restore read mode */
 565                         return (1);
 566                 }
 567         }
 568
 569         *addr = (FPW) 0x00FF00FF;       /* restore read mode */
 570
 571         return (0);
 572 }
 573
 574 void inline spin_wheel (void)
 575 {
 576         static int p = 0;
 577         static char w[] = "\\/-";
 578
 579         printf ("\010%c", w[p]);
 580         (++p == 3) ? (p = 0) : 0;
 581 }
 582
 583 /*-----------------------------------------------------------------------
 584  * Set/Clear sector's lock bit, returns:
 585  * 0 - OK
 586  * 1 - Error (timeout, voltage problems, etc.)
 587  */
 588 int flash_real_protect (flash_info_t *info, long sector, int prot)
 589 {
 590         ulong start;
 591         int i;
 592         int rc = 0;
 593         vu_long *addr = (vu_long *)(info->start[sector]);
 594         int flag = disable_interrupts();
 595
 596         *addr = INTEL_CLEAR;    /* Clear status register */
 597         if (prot) {                     /* Set sector lock bit */
 598                 *addr = INTEL_LOCKBIT;  /* Sector lock bit */
 599                 *addr = INTEL_PROTECT;  /* set */
 600         }
 601         else {                          /* Clear sector lock bit */
 602                 *addr = INTEL_LOCKBIT;  /* All sectors lock bits */
 603                 *addr = INTEL_CONFIRM;  /* clear */
 604         }
 605
 606         start = get_timer(0);
 607
 608         while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
 609                 if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT) {
 610                         printf("Flash lock bit operation timed out\n");
 611                         rc = 1;
 612                         break;
 613                 }
 614         }
 615
 616         if (*addr != INTEL_OK) {
 617                 printf("Flash lock bit operation failed at %08X, CSR=%08X\n",
 618                        (uint)addr, (uint)*addr);
 619                 rc = 1;
 620         }
 621
 622         if (!rc)
 623                 info->protect[sector] = prot;
 624
 625         /*
 626          * Clear lock bit command clears all sectors lock bits, so
 627          * we have to restore lock bits of protected sectors.
 628          * WARNING: code below re-locks sectors only for one bank (info).
 629          * This causes problems on boards where several banks share
 630          * the same chip, as sectors in othere banks will be unlocked
 631          * but not re-locked. It works fine on pm520 though, as there
 632          * is only one chip and one bank.
 633          */
 634         if (!prot)
 635         {
 636                 for (i = 0; i < info->sector_count; i++)
 637                 {
 638                         if (info->protect[i])
 639                         {
 640                                 start = get_timer(0);
 641                                 addr = (vu_long *)(info->start[i]);
 642                                 *addr = INTEL_LOCKBIT;  /* Sector lock bit */
 643                                 *addr = INTEL_PROTECT;  /* set */
 644                                 while ((*addr & INTEL_FINISHED) != INTEL_FINISHED)
 645                                 {
 646                                         if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT)
 647                                         {
 648                                                 printf("Flash lock bit operation timed out\n");
 649                                                 rc = 1;
 650                                                 break;
 651                                         }
 652                                 }
 653                         }
 654                 }
 655                 /*
 656                  * get the s/w sector protection status in sync with the h/w,
 657                  * in case something went wrong during the re-locking.
 658                  */
 659                 flash_sync_real_protect(info); /* resets flash to read  mode */
 660         }
 661
 662         if (flag)
 663                 enable_interrupts();
 664
 665         *addr = INTEL_RESET;            /* Reset to read array mode */
 666
 667         return rc;
 668 }