board/cmc_pu2/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  * Modified for the CMC PU2 by (C) Copyright 2004 Gary Jennejohn
   9  * garyj@denx.de
  10  *
  11  * See file CREDITS for list of people who contributed to this
  12  * project.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation; either version 2 of
  17  * the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  * MA 02111-1307 USA
  28  */
  29
  30 #include <common.h>
  31
  32 #ifndef CFG_ENV_ADDR
  33 #define CFG_ENV_ADDR    (CFG_FLASH_BASE + CFG_ENV_OFFSET)
  34 #endif
  35
  36 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
  37
  38 #define FLASH_CYCLE1    0x0555
  39 #define FLASH_CYCLE2    0x02AA
  40
  41 /*-----------------------------------------------------------------------
  42  * Functions
  43  */
  44 static ulong flash_get_size(vu_short *addr, flash_info_t *info);
  45 static void flash_reset(flash_info_t *info);
  46 static int write_word_amd(flash_info_t *info, vu_short *dest, ushort data);
  47 static flash_info_t *flash_get_info(ulong base);
  48
  49 /*-----------------------------------------------------------------------
  50  * flash_init()
  51  *
  52  * sets up flash_info and returns size of FLASH (bytes)
  53  */
  54 unsigned long flash_init (void)
  55 {
  56         unsigned long size = 0;
  57         ulong flashbase = CFG_FLASH_BASE;
  58
  59         /* Init: no FLASHes known */
  60         memset(&flash_info[0], 0, sizeof(flash_info_t));
  61
  62         flash_info[0].size = flash_get_size((vu_short *)flashbase, &flash_info[0]);
  63
  64         size = flash_info[0].size;
  65
  66 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
  67         /* monitor protection ON by default */
  68         flash_protect(FLAG_PROTECT_SET,
  69                       CFG_MONITOR_BASE,
  70                       CFG_MONITOR_BASE+monitor_flash_len-1,
  71                       flash_get_info(CFG_MONITOR_BASE));
  72 #endif
  73
  74 #ifdef  CFG_ENV_IS_IN_FLASH
  75         /* ENV protection ON by default */
  76         flash_protect(FLAG_PROTECT_SET,
  77                       CFG_ENV_ADDR,
  78                       CFG_ENV_ADDR+CFG_ENV_SIZE-1,
  79                       flash_get_info(CFG_ENV_ADDR));
  80 #endif
  81
  82         return size ? size : 1;
  83 }
  84
  85 /*-----------------------------------------------------------------------
  86  */
  87 static void flash_reset(flash_info_t *info)
  88 {
  89         vu_short *base = (vu_short *)(info->start[0]);
  90
  91         /* Put FLASH back in read mode */
  92         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
  93                 *base = 0x00FF; /* Intel Read Mode */
  94         else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
  95                 *base = 0x00F0; /* AMD Read Mode */
  96 }
  97
  98 /*-----------------------------------------------------------------------
  99  */
 100
 101 static flash_info_t *flash_get_info(ulong base)
 102 {
 103         int i;
 104         flash_info_t * info;
 105
 106         info = NULL;
 107         for (i = 0; i < CFG_MAX_FLASH_BANKS; i ++) {
 108                 info = & flash_info[i];
 109                 if (info->size && info->start[0] <= base &&
 110                     base <= info->start[0] + info->size - 1)
 111                         break;
 112         }
 113
 114         return i == CFG_MAX_FLASH_BANKS ? 0 : info;
 115 }
 116
 117 /*-----------------------------------------------------------------------
 118  */
 119
 120 void flash_print_info (flash_info_t *info)
 121 {
 122         int i;
 123
 124         if (info->flash_id == FLASH_UNKNOWN) {
 125                 printf ("missing or unknown FLASH type\n");
 126                 return;
 127         }
 128
 129         switch (info->flash_id & FLASH_VENDMASK) {
 130         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 131         case FLASH_MAN_BM:      printf ("BRIGHT MICRO ");       break;
 132         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 133         case FLASH_MAN_SST:     printf ("SST ");                break;
 134         case FLASH_MAN_STM:     printf ("STM ");                break;
 135         case FLASH_MAN_INTEL:   printf ("INTEL ");              break;
 136         default:                printf ("Unknown Vendor ");     break;
 137         }
 138
 139         switch (info->flash_id & FLASH_TYPEMASK) {
 140         case FLASH_S29GL064M:
 141                 printf ("S29GL064M-R6 (64Mbit, uniform sector size)\n");
 142                 break;
 143         default:
 144                 printf ("Unknown Chip Type\n");
 145                 break;
 146         }
 147
 148         printf ("  Size: %ld MB in %d Sectors\n",
 149                 info->size >> 20,
 150                 info->sector_count);
 151
 152         printf ("  Sector Start Addresses:");
 153
 154         for (i=0; i<info->sector_count; ++i) {
 155                 if ((i % 5) == 0) {
 156                         printf ("\n   ");
 157                 }
 158                 printf (" %08lX%s",
 159                         info->start[i],
 160                         info->protect[i] ? " (RO)" : "     ");
 161         }
 162         printf ("\n");
 163         return;
 164 }
 165
 166 /*-----------------------------------------------------------------------
 167  */
 168
 169 /*
 170  * The following code cannot be run from FLASH!
 171  */
 172
 173 ulong flash_get_size (vu_short *addr, flash_info_t *info)
 174 {
 175         int i;
 176         ushort value;
 177         ulong base = (ulong)addr;
 178
 179         /* Write auto select command sequence */
 180         addr[FLASH_CYCLE1] = 0x00AA;    /* for AMD, Intel ignores this */
 181         addr[FLASH_CYCLE2] = 0x0055;    /* for AMD, Intel ignores this */
 182         addr[FLASH_CYCLE1] = 0x0090;    /* selects Intel or AMD */
 183
 184         /* read Manufacturer ID */
 185         udelay(100);
 186         value = addr[0];
 187         debug ("Manufacturer ID: %04X\n", value);
 188
 189         switch (value) {
 190
 191         case (AMD_MANUFACT & 0xFFFF):
 192                 debug ("Manufacturer: AMD (Spansion)\n");
 193                 info->flash_id = FLASH_MAN_AMD;
 194                 break;
 195
 196         case (INTEL_MANUFACT & 0xFFFF):
 197                 debug ("Manufacturer: Intel (not supported yet)\n");
 198                 info->flash_id = FLASH_MAN_INTEL;
 199                 break;
 200
 201         default:
 202                 printf ("Unknown Manufacturer ID: %04X\n", value);
 203                 info->flash_id = FLASH_UNKNOWN;
 204                 info->sector_count = 0;
 205                 info->size = 0;
 206                 goto out;
 207         }
 208
 209         value = addr[1];
 210         debug ("Device ID: %04X\n", value);
 211
 212         switch (addr[1]) {
 213
 214         case (AMD_ID_MIRROR & 0xFFFF):
 215                 debug ("Mirror Bit flash: addr[14] = %08X  addr[15] = %08X\n",
 216                         addr[14], addr[15]);
 217
 218                 switch(addr[14]) {
 219                 case (AMD_ID_GL064M_2 & 0xFFFF):
 220                         if (addr[15] != (AMD_ID_GL064M_3 & 0xffff)) {
 221                                 printf ("Chip: S29GLxxxM -> unknown\n");
 222                                 info->flash_id = FLASH_UNKNOWN;
 223                                 info->sector_count = 0;
 224                                 info->size = 0;
 225                         } else {
 226                                 debug ("Chip: S29GL064M-R6\n");
 227                                 info->flash_id += FLASH_S29GL064M;
 228                                 info->sector_count = 128;
 229                                 info->size = 0x00800000;
 230                                 for (i = 0; i < info->sector_count; i++) {
 231                                         info->start[i] = base;
 232                                         base += 0x10000;
 233                                 }
 234                         }
 235                         break;  /* => 16 MB     */
 236                 default:
 237                         printf ("Chip: *** unknown ***\n");
 238                         info->flash_id = FLASH_UNKNOWN;
 239                         info->sector_count = 0;
 240                         info->size = 0;
 241                         break;
 242                 }
 243                 break;
 244
 245         default:
 246                 printf ("Unknown Device ID: %04X\n", value);
 247                 info->flash_id = FLASH_UNKNOWN;
 248                 info->sector_count = 0;
 249                 info->size = 0;
 250                 break;
 251         }
 252
 253 out:
 254         /* Put FLASH back in read mode */
 255         flash_reset(info);
 256
 257         return (info->size);
 258 }
 259
 260 /*-----------------------------------------------------------------------
 261  */
 262
 263 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 264 {
 265         vu_short *addr = (vu_short *)(info->start[0]);
 266         int flag, prot, sect, ssect, l_sect;
 267         ulong start, now, last;
 268
 269         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 270
 271         if ((s_first < 0) || (s_first > s_last)) {
 272                 if (info->flash_id == FLASH_UNKNOWN) {
 273                         printf ("- missing\n");
 274                 } else {
 275                         printf ("- no sectors to erase\n");
 276                 }
 277                 return 1;
 278         }
 279
 280         if ((info->flash_id == FLASH_UNKNOWN) ||
 281             (info->flash_id > FLASH_AMD_COMP)) {
 282                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 283                         info->flash_id);
 284                 return 1;
 285         }
 286
 287         prot = 0;
 288         for (sect=s_first; sect<=s_last; ++sect) {
 289                 if (info->protect[sect]) {
 290                         prot++;
 291                 }
 292         }
 293
 294         if (prot) {
 295                 printf ("- Warning: %d protected sectors will not be erased!\n",
 296                         prot);
 297         } else {
 298                 printf ("\n");
 299         }
 300
 301         /* Disable interrupts which might cause a timeout here */
 302         flag = disable_interrupts();
 303
 304         /*
 305          * Start erase on unprotected sectors.
 306          * Since the flash can erase multiple sectors with one command
 307          * we take advantage of that by doing the erase in chunks of
 308          * 3 sectors.
 309          */
 310         for (sect = s_first; sect <= s_last; ) {
 311                 l_sect = -1;
 312
 313                 addr[FLASH_CYCLE1] = 0x00AA;
 314                 addr[FLASH_CYCLE2] = 0x0055;
 315                 addr[FLASH_CYCLE1] = 0x0080;
 316                 addr[FLASH_CYCLE1] = 0x00AA;
 317                 addr[FLASH_CYCLE2] = 0x0055;
 318
 319                 /* do the erase in chunks of at most 3 sectors */
 320                 for (ssect = 0; ssect < 3; ssect++) {
 321                         if ((sect + ssect) > s_last)
 322                                 break;
 323                         if (info->protect[sect + ssect] == 0) { /* not protected */
 324                                 addr = (vu_short *)(info->start[sect + ssect]);
 325                                 addr[0] = 0x0030;
 326                                 l_sect = sect + ssect;
 327                         }
 328                 }
 329                 /* wait at least 80us - let's wait 1 ms */
 330                 udelay (1000);
 331
 332                 /*
 333                  * We wait for the last triggered sector
 334                  */
 335                 if (l_sect < 0)
 336                         goto DONE;
 337
 338                 start = get_timer (0);
 339                 last  = start;
 340                 addr = (vu_short *)(info->start[l_sect]);
 341                 while ((addr[0] & 0x0080) != 0x0080) {
 342                         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 343                                 printf ("Timeout\n");
 344                                 return 1;
 345                         }
 346                         /* show that we're waiting */
 347                         if ((now - last) > 1000) {      /* every second */
 348                                 putc ('.');
 349                                 last = now;
 350                         }
 351                 }
 352                 addr = (vu_short *)info->start[0];
 353                 addr[0] = 0x00F0;       /* reset bank */
 354                 sect += ssect;
 355         }
 356
 357         /* re-enable interrupts if necessary */
 358         if (flag)
 359                 enable_interrupts();
 360
 361 DONE:
 362         /* reset to read mode */
 363         addr = (vu_short *)info->start[0];
 364         addr[0] = 0x00F0;       /* reset bank */
 365
 366         printf (" done\n");
 367         return 0;
 368 }
 369
 370 /*-----------------------------------------------------------------------
 371  * Copy memory to flash, returns:
 372  * 0 - OK
 373  * 1 - write timeout
 374  * 2 - Flash not erased
 375  */
 376
 377 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 378 {
 379         ulong wp, data;
 380         int rc;
 381
 382         if (addr & 1) {
 383                 printf ("unaligned destination not supported\n");
 384                 return ERR_ALIGN;
 385         };
 386
 387         if ((int) src & 1) {
 388                 printf ("unaligned source not supported\n");
 389                 return ERR_ALIGN;
 390         };
 391
 392         wp = addr;
 393
 394         while (cnt >= 2) {
 395                 data = *((vu_short *)src);
 396                 if ((rc = write_word_amd(info, (vu_short *)wp, data)) != 0) {
 397                         return (rc);
 398                 }
 399                 src += 2;
 400                 wp += 2;
 401                 cnt -= 2;
 402         }
 403
 404         if (cnt == 0) {
 405                 return (0);
 406         }
 407
 408         if (cnt == 1) {
 409                 data = (*((volatile u8 *) src)) | (*((volatile u8 *) (wp + 1))
 410                                 << 8);
 411                 if ((rc = write_word_amd(info, (vu_short *)wp, data)) != 0) {
 412                         return (rc);
 413                 }
 414                 src += 1;
 415                 wp += 1;
 416                 cnt -= 1;
 417         }
 418
 419         return ERR_OK;
 420 }
 421
 422 /*-----------------------------------------------------------------------
 423  * Write a word to Flash for AMD FLASH
 424  * A word is 16 or 32 bits, whichever the bus width of the flash bank
 425  * (not an individual chip) is.
 426  *
 427  * returns:
 428  * 0 - OK
 429  * 1 - write timeout
 430  * 2 - Flash not erased
 431  */
 432 static int write_word_amd (flash_info_t *info, vu_short *dest, ushort data)
 433 {
 434         ulong start;
 435         int flag;
 436         vu_short *base;         /* first address in flash bank  */
 437
 438         /* Check if Flash is (sufficiently) erased */
 439         if ((*dest & data) != data) {
 440                 return (2);
 441         }
 442
 443         base = (vu_short *)(info->start[0]);
 444
 445         /* Disable interrupts which might cause a timeout here */
 446         flag = disable_interrupts();
 447
 448         base[FLASH_CYCLE1] = 0x00AA;    /* unlock */
 449         base[FLASH_CYCLE2] = 0x0055;    /* unlock */
 450         base[FLASH_CYCLE1] = 0x00A0;    /* selects program mode */
 451
 452         *dest = data;           /* start programming the data   */
 453
 454         /* re-enable interrupts if necessary */
 455         if (flag)
 456                 enable_interrupts();
 457
 458         start = get_timer (0);
 459
 460         /* data polling for D7 */
 461         while ((*dest & 0x0080) != (data & 0x0080)) {
 462                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 463                         *dest = 0x00F0; /* reset bank */
 464                         return (1);
 465                 }
 466         }
 467         return (0);
 468 }