board/tqm5200/flash.c

   1 /*
   2  * (C) Copyright 2003-2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2004
   6  * Martin Krause, TQ-Systems GmbH, martin.krause@tqs.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
  29 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
  30
  31 /*
  32  * CPU to flash interface is 32-bit, so make declaration accordingly
  33  */
  34 typedef unsigned long FLASH_PORT_WIDTH;
  35 typedef volatile unsigned long FLASH_PORT_WIDTHV;
  36
  37 #define FPW     FLASH_PORT_WIDTH
  38 #define FPWV    FLASH_PORT_WIDTHV
  39
  40 #define FLASH_CYCLE1    0x0555
  41 #define FLASH_CYCLE2    0x02aa
  42
  43 /*-----------------------------------------------------------------------
  44  * Functions
  45  */
  46 static ulong flash_get_size(FPWV *addr, flash_info_t *info);
  47 static void flash_reset(flash_info_t *info);
  48 static int write_word_amd(flash_info_t *info, FPWV *dest, FPW data);
  49 static flash_info_t *flash_get_info(ulong base);
  50
  51 /*-----------------------------------------------------------------------
  52  * flash_init()
  53  *
  54  * sets up flash_info and returns size of FLASH (bytes)
  55  */
  56 unsigned long flash_init (void)
  57 {
  58         unsigned long size = 0;
  59         extern void flash_preinit(void);
  60         ulong flashbase = CFG_FLASH_BASE;
  61
  62         flash_preinit();
  63
  64         /* Init: no FLASHes known */
  65         memset(&flash_info[0], 0, sizeof(flash_info_t));
  66
  67         flash_info[0].size =
  68                 flash_get_size((FPW *)flashbase, &flash_info[0]);
  69
  70         size = flash_info[0].size;
  71
  72 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
  73         /* monitor protection ON by default */
  74         flash_protect(FLAG_PROTECT_SET,
  75                       CFG_MONITOR_BASE,
  76                       CFG_MONITOR_BASE+monitor_flash_len-1,
  77                       flash_get_info(CFG_MONITOR_BASE));
  78 #endif
  79
  80 #ifdef  CFG_ENV_IS_IN_FLASH
  81         /* ENV protection ON by default */
  82         flash_protect(FLAG_PROTECT_SET,
  83                       CFG_ENV_ADDR,
  84                       CFG_ENV_ADDR+CFG_ENV_SIZE-1,
  85                       flash_get_info(CFG_ENV_ADDR));
  86 #endif
  87
  88         return size ? size : 1;
  89 }
  90
  91 /*-----------------------------------------------------------------------
  92  */
  93 static void flash_reset(flash_info_t *info)
  94 {
  95         FPWV *base = (FPWV *)(info->start[0]);
  96
  97         /* Put FLASH back in read mode */
  98         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
  99                 *base = (FPW)0x00FF00FF;        /* Intel Read Mode */
 100         else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
 101                 *base = (FPW)0x00F000F0;        /* AMD Read Mode */
 102 }
 103
 104 /*-----------------------------------------------------------------------
 105  */
 106
 107 static flash_info_t *flash_get_info(ulong base)
 108 {
 109         int i;
 110         flash_info_t * info;
 111
 112         for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) {
 113                 info = & flash_info[i];
 114                 if (info->size && info->start[0] <= base &&
 115                     base <= info->start[0] + info->size - 1)
 116                         break;
 117         }
 118
 119         return i == CFG_MAX_FLASH_BANKS ? 0 : info;
 120 }
 121
 122 /*-----------------------------------------------------------------------
 123  */
 124
 125 void flash_print_info (flash_info_t *info)
 126 {
 127         int i;
 128
 129         if (info->flash_id == FLASH_UNKNOWN) {
 130                 printf ("missing or unknown FLASH type\n");
 131                 return;
 132         }
 133
 134         switch (info->flash_id & FLASH_VENDMASK) {
 135         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 136         case FLASH_MAN_BM:      printf ("BRIGHT MICRO ");       break;
 137         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 138         case FLASH_MAN_SST:     printf ("SST ");                break;
 139         case FLASH_MAN_STM:     printf ("STM ");                break;
 140         case FLASH_MAN_INTEL:   printf ("INTEL ");              break;
 141         default:                printf ("Unknown Vendor ");     break;
 142         }
 143
 144         switch (info->flash_id & FLASH_TYPEMASK) {
 145         case FLASH_AMLV128U:
 146                 printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
 147                 break;
 148         case FLASH_AM160B:
 149                 printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 150                 break;
 151         default:
 152                 printf ("Unknown Chip Type\n");
 153                 break;
 154         }
 155
 156         printf ("  Size: %ld MB in %d Sectors\n",
 157                 info->size >> 20,
 158                 info->sector_count);
 159
 160         printf ("  Sector Start Addresses:");
 161
 162         for (i=0; i<info->sector_count; ++i) {
 163                 if ((i % 5) == 0) {
 164                         printf ("\n   ");
 165                 }
 166                 printf (" %08lX%s",
 167                         info->start[i],
 168                         info->protect[i] ? " (RO)" : "     ");
 169         }
 170         printf ("\n");
 171         return;
 172 }
 173
 174 /*-----------------------------------------------------------------------
 175  */
 176
 177 /*
 178  * The following code cannot be run from FLASH!
 179  */
 180
 181 ulong flash_get_size (FPWV *addr, flash_info_t *info)
 182 {
 183         int i;
 184         ulong base = (ulong)addr;
 185
 186         /* Write auto select command: read Manufacturer ID */
 187         /* Write auto select command sequence and test FLASH answer */
 188         addr[FLASH_CYCLE1] = (FPW)0x00AA00AA;   /* for AMD, Intel ignores this */
 189         addr[FLASH_CYCLE2] = (FPW)0x00550055;   /* for AMD, Intel ignores this */
 190         addr[FLASH_CYCLE1] = (FPW)0x00900090;   /* selects Intel or AMD */
 191
 192         /* The manufacturer codes are only 1 byte, so just use 1 byte.
 193          * This works for any bus width and any FLASH device width.
 194          */
 195         udelay(100);
 196         switch (addr[0] & 0xff) {
 197
 198         case (uchar)AMD_MANUFACT:
 199                 debug ("Manufacturer: AMD (Spansion)\n");
 200                 info->flash_id = FLASH_MAN_AMD;
 201                 break;
 202
 203         case (uchar)INTEL_MANUFACT:
 204                 debug ("Manufacturer: Intel (not supported yet)\n");
 205                 info->flash_id = FLASH_MAN_INTEL;
 206                 break;
 207
 208         default:
 209                 info->flash_id = FLASH_UNKNOWN;
 210                 info->sector_count = 0;
 211                 info->size = 0;
 212                 break;
 213         }
 214
 215         /* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
 216         if (info->flash_id != FLASH_UNKNOWN) switch ((FPW)addr[1]) {
 217
 218         case (FPW)AMD_ID_LV160B:
 219                 debug ("Chip: AM29LV160MB\n");
 220                 info->flash_id += FLASH_AM160B;
 221                 info->sector_count = 35;
 222                 info->size = 0x00400000;
 223                 /*
 224                  * The first 4 sectors are 16 kB, 8 kB, 8 kB and 32 kB, all
 225                  * the other ones are 64 kB
 226                  */
 227                 info->start[0] = base + 0x00000000;
 228                 info->start[1] = base + 0x00008000;
 229                 info->start[2] = base + 0x0000C000;
 230                 info->start[3] = base + 0x00010000;
 231                 for( i = 4; i < info->sector_count; i++ )
 232                         info->start[i] =
 233                                 base + (i * 2 * (64 << 10)) - 0x00060000;
 234                 break;          /* => 4 MB */
 235
 236         case AMD_ID_MIRROR:
 237                 debug ("Mirror Bit flash: addr[14] = %08lX  addr[15] = %08lX\n",
 238                         addr[14], addr[15]);
 239
 240                 switch(addr[14]) {
 241                 case AMD_ID_LV128U_2:
 242                         if (addr[15] != AMD_ID_LV128U_3) {
 243                                 debug ("Chip: AM29LVxxxM -> unknown\n");
 244                                 info->flash_id = FLASH_UNKNOWN;
 245                                 info->sector_count = 0;
 246                                 info->size = 0;
 247                         } else {
 248                                 debug ("Chip: AM29LV128M\n");
 249                                 info->flash_id += FLASH_AMLV128U;
 250                                 info->sector_count = 256;
 251                                 info->size = 0x02000000;
 252                                 for (i = 0; i < info->sector_count; i++) {
 253                                         info->start[i] = base;
 254                                         base += 0x20000;
 255                                 }
 256                         }
 257                         break;  /* => 32 MB     */
 258                 default:
 259                         debug ("Chip: *** unknown ***\n");
 260                         info->flash_id = FLASH_UNKNOWN;
 261                         info->sector_count = 0;
 262                         info->size = 0;
 263                         break;
 264                 }
 265                 break;
 266
 267         default:
 268                 info->flash_id = FLASH_UNKNOWN;
 269                 info->sector_count = 0;
 270                 info->size = 0;
 271         }
 272
 273         /* Put FLASH back in read mode */
 274         flash_reset(info);
 275
 276         return (info->size);
 277 }
 278
 279 /*-----------------------------------------------------------------------
 280  */
 281
 282 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 283 {
 284         vu_long *addr = (vu_long*)(info->start[0]);
 285         int flag, prot, sect, l_sect;
 286         ulong start, now, last;
 287
 288         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 289
 290         if ((s_first < 0) || (s_first > s_last)) {
 291                 if (info->flash_id == FLASH_UNKNOWN) {
 292                         printf ("- missing\n");
 293                 } else {
 294                         printf ("- no sectors to erase\n");
 295                 }
 296                 return 1;
 297         }
 298
 299         if ((info->flash_id == FLASH_UNKNOWN) ||
 300             (info->flash_id > FLASH_AMD_COMP)) {
 301                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 302                         info->flash_id);
 303                 return 1;
 304         }
 305
 306         prot = 0;
 307         for (sect=s_first; sect<=s_last; ++sect) {
 308                 if (info->protect[sect]) {
 309                         prot++;
 310                 }
 311         }
 312
 313         if (prot) {
 314                 printf ("- Warning: %d protected sectors will not be erased!\n",
 315                         prot);
 316         } else {
 317                 printf ("\n");
 318         }
 319
 320         l_sect = -1;
 321
 322         /* Disable interrupts which might cause a timeout here */
 323         flag = disable_interrupts();
 324
 325         addr[0x0555] = 0x00AA00AA;
 326         addr[0x02AA] = 0x00550055;
 327         addr[0x0555] = 0x00800080;
 328         addr[0x0555] = 0x00AA00AA;
 329         addr[0x02AA] = 0x00550055;
 330
 331         /* Start erase on unprotected sectors */
 332         for (sect = s_first; sect<=s_last; sect++) {
 333                 if (info->protect[sect] == 0) { /* not protected */
 334                         addr = (vu_long*)(info->start[sect]);
 335                         addr[0] = 0x00300030;
 336                         l_sect = sect;
 337                 }
 338         }
 339
 340         /* re-enable interrupts if necessary */
 341         if (flag)
 342                 enable_interrupts();
 343
 344         /* wait at least 80us - let's wait 1 ms */
 345         udelay (1000);
 346
 347         /*
 348          * We wait for the last triggered sector
 349          */
 350         if (l_sect < 0)
 351                 goto DONE;
 352
 353         start = get_timer (0);
 354         last  = start;
 355         addr = (vu_long*)(info->start[l_sect]);
 356         while ((addr[0] & 0x00800080) != 0x00800080) {
 357                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 358                         printf ("Timeout\n");
 359                         return 1;
 360                 }
 361                 /* show that we're waiting */
 362                 if ((now - last) > 1000) {      /* every second */
 363                         putc ('.');
 364                         last = now;
 365                 }
 366         }
 367
 368 DONE:
 369         /* reset to read mode */
 370         addr = (volatile unsigned long *)info->start[0];
 371         addr[0] = 0x00F000F0;   /* reset bank */
 372
 373         printf (" done\n");
 374         return 0;
 375 }
 376
 377 /*-----------------------------------------------------------------------
 378  * Copy memory to flash, returns:
 379  * 0 - OK
 380  * 1 - write timeout
 381  * 2 - Flash not erased
 382  */
 383
 384 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 385 {
 386         ulong cp, wp, data;
 387         int i, l, rc;
 388
 389         /*
 390          * Get lower word aligned address. Assumes 32 bit flash bus width.
 391          */
 392         wp = (addr & ~3);
 393
 394         /*
 395          * handle unaligned start bytes
 396          */
 397         if ((l = addr - wp) != 0) {
 398                 data = 0;
 399                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 400                         data = (data << 8) | (*(uchar *)cp);
 401                 }
 402                 for (; i<4 && cnt>0; ++i) {
 403                         data = (data << 8) | *src++;
 404                         --cnt;
 405                         ++cp;
 406                 }
 407                 for (; cnt==0 && i<4; ++i, ++cp) {
 408                         data = (data << 8) | (*(uchar *)cp);
 409                 }
 410
 411                 if ((rc = write_word_amd(info, (FPW *)wp, data)) != 0) {
 412                         return (rc);
 413                 }
 414                 wp += 4;
 415         }
 416
 417         /*
 418          * handle word aligned part
 419          */
 420         while (cnt >= 4) {
 421                 data = 0;
 422                 for (i=0; i<4; ++i) {
 423                         data = (data << 8) | *src++;
 424                 }
 425                 if ((rc = write_word_amd(info, (FPW *)wp, data)) != 0) {
 426                         return (rc);
 427                 }
 428                 wp  += 4;
 429                 cnt -= 4;
 430         }
 431
 432         if (cnt == 0) {
 433                 return (0);
 434         }
 435
 436         /*
 437          * handle unaligned tail bytes
 438          */
 439         data = 0;
 440         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 441                 data = (data << 8) | *src++;
 442                 --cnt;
 443         }
 444         for (; i<4; ++i, ++cp) {
 445                 data = (data << 8) | (*(uchar *)cp);
 446         }
 447
 448         return (write_word_amd(info, (FPW *)wp, data));
 449 }
 450
 451 /*-----------------------------------------------------------------------
 452  * Write a word to Flash for AMD FLASH
 453  * A word is 16 or 32 bits, whichever the bus width of the flash bank
 454  * (not an individual chip) is.
 455  *
 456  * returns:
 457  * 0 - OK
 458  * 1 - write timeout
 459  * 2 - Flash not erased
 460  */
 461 static int write_word_amd (flash_info_t *info, FPWV *dest, FPW data)
 462 {
 463         ulong start;
 464         int flag;
 465         FPWV *base;             /* first address in flash bank  */
 466
 467         /* Check if Flash is (sufficiently) erased */
 468         if ((*dest & data) != data) {
 469                 return (2);
 470         }
 471
 472         base = (FPWV *)(info->start[0]);
 473
 474         /* Disable interrupts which might cause a timeout here */
 475         flag = disable_interrupts();
 476
 477         base[FLASH_CYCLE1] = (FPW)0x00AA00AA;   /* unlock */
 478         base[FLASH_CYCLE2] = (FPW)0x00550055;   /* unlock */
 479         base[FLASH_CYCLE1] = (FPW)0x00A000A0;   /* selects program mode */
 480
 481         *dest = data;           /* start programming the data   */
 482
 483         /* re-enable interrupts if necessary */
 484         if (flag)
 485                 enable_interrupts();
 486
 487         start = get_timer (0);
 488
 489         /* data polling for D7 */
 490         while ((*dest & (FPW)0x00800080) != (data & (FPW)0x00800080)) {
 491                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 492                         *dest = (FPW)0x00F000F0;        /* reset bank */
 493                         return (1);
 494                 }
 495         }
 496         return (0);
 497 }