board/cpu86/flash.c

   1 /*
   2  * (C) Copyright 2001, 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * Flash Routines for Intel devices
   6  *
   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 #include "cpu86.h"
  30
  31 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
  32
  33 /*-----------------------------------------------------------------------
  34  */
  35 ulong flash_int_get_size (volatile unsigned long *baseaddr,
  36                                           flash_info_t * info)
  37 {
  38         short i;
  39         unsigned long flashtest_h, flashtest_l;
  40
  41         info->sector_count = info->size = 0;
  42         info->flash_id = FLASH_UNKNOWN;
  43
  44         /* Write identify command sequence and test FLASH answer
  45          */
  46         baseaddr[0] = 0x00900090;
  47         baseaddr[1] = 0x00900090;
  48
  49         flashtest_h = baseaddr[0];      /* manufacturer ID      */
  50         flashtest_l = baseaddr[1];
  51
  52         if (flashtest_h != INTEL_MANUFACT || flashtest_l != INTEL_MANUFACT)
  53                 return (0);             /* no or unknown flash  */
  54
  55         flashtest_h = baseaddr[2];      /* device ID            */
  56         flashtest_l = baseaddr[3];
  57
  58         if (flashtest_h != flashtest_l)
  59                 return (0);
  60
  61         switch (flashtest_h) {
  62         case INTEL_ID_28F160C3B:
  63                 info->flash_id = FLASH_28F160C3B;
  64                 info->sector_count = 39;
  65                 info->size = 0x00800000;        /* 4 * 2 MB = 8 MB      */
  66                 break;
  67         case INTEL_ID_28F160F3B:
  68                 info->flash_id = FLASH_28F160F3B;
  69                 info->sector_count = 39;
  70                 info->size = 0x00800000;        /* 4 * 2 MB = 8 MB      */
  71                 break;
  72         default:
  73                 return (0);                     /* no or unknown flash  */
  74         }
  75
  76         info->flash_id |= INTEL_MANUFACT << 16; /* set manufacturer offset */
  77
  78         if (info->flash_id & FLASH_BTYPE) {
  79                 volatile unsigned long *tmp = baseaddr;
  80
  81                 /* set up sector start adress table (bottom sector type)
  82                  * AND unlock the sectors (if our chip is 160C3)
  83                  */
  84                 for (i = 0; i < info->sector_count; i++) {
  85                         if ((info->flash_id & FLASH_TYPEMASK) == FLASH_28F160C3B) {
  86                                 tmp[0] = 0x00600060;
  87                                 tmp[1] = 0x00600060;
  88                                 tmp[0] = 0x00D000D0;
  89                                 tmp[1] = 0x00D000D0;
  90                         }
  91                         info->start[i] = (uint) tmp;
  92                         tmp += i < 8 ? 0x2000 : 0x10000; /* pointer arith       */
  93                 }
  94         }
  95
  96         memset (info->protect, 0, info->sector_count);
  97
  98         baseaddr[0] = 0x00FF00FF;
  99         baseaddr[1] = 0x00FF00FF;
 100
 101         return (info->size);
 102 }
 103
 104 static ulong flash_amd_get_size (vu_char *addr, flash_info_t *info)
 105 {
 106         short i;
 107         uchar vendor, devid;
 108         ulong base = (ulong)addr;
 109
 110         /* Write auto select command: read Manufacturer ID */
 111         addr[0x0555] = 0xAA;
 112         addr[0x02AA] = 0x55;
 113         addr[0x0555] = 0x90;
 114
 115         udelay(1000);
 116
 117         vendor = addr[0];
 118         devid = addr[1] & 0xff;
 119
 120         /* only support AMD */
 121         if (vendor != 0x01) {
 122                 return 0;
 123         }
 124
 125         vendor &= 0xf;
 126         devid &= 0xff;
 127
 128         if (devid == AMD_ID_F040B) {
 129                 info->flash_id     = vendor << 16 | devid;
 130                 info->sector_count = 8;
 131                 info->size         = info->sector_count * 0x10000;
 132         }
 133         else if (devid == AMD_ID_F080B) {
 134                 info->flash_id     = vendor << 16 | devid;
 135                 info->sector_count = 16;
 136                 info->size         = 4 * info->sector_count * 0x10000;
 137         }
 138         else if (devid == AMD_ID_F016D) {
 139                 info->flash_id     = vendor << 16 | devid;
 140                 info->sector_count = 32;
 141                 info->size         = 4 * info->sector_count * 0x10000;
 142         }
 143         else {
 144                 printf ("## Unknown Flash Type: %02x\n", devid);
 145                 return 0;
 146         }
 147
 148         /* check for protected sectors */
 149         for (i = 0; i < info->sector_count; i++) {
 150                 /* sector base address */
 151                 info->start[i] = base + i * (info->size / info->sector_count);
 152                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 153                 /* D0 = 1 if protected */
 154                 addr = (volatile unsigned char *)(info->start[i]);
 155                 info->protect[i] = addr[2] & 1;
 156         }
 157
 158         /*
 159          * Prevent writes to uninitialized FLASH.
 160          */
 161         if (info->flash_id != FLASH_UNKNOWN) {
 162                 addr = (vu_char *)info->start[0];
 163                 addr[0] = 0xF0; /* reset bank */
 164         }
 165
 166         return (info->size);
 167 }
 168
 169
 170 /*-----------------------------------------------------------------------
 171  */
 172 unsigned long flash_init (void)
 173 {
 174         unsigned long size_b0 = 0;
 175         unsigned long size_b1 = 0;
 176         int i;
 177
 178         /* Init: no FLASHes known
 179          */
 180         for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
 181                 flash_info[i].flash_id = FLASH_UNKNOWN;
 182         }
 183
 184         /* Disable flash protection */
 185         CPU86_BCR |= (CPU86_BCR_FWPT | CPU86_BCR_FWRE);
 186
 187         /* Static FLASH Bank configuration here (only one bank) */
 188
 189         size_b0 = flash_int_get_size ((ulong *) CFG_FLASH_BASE, &flash_info[0]);
 190         size_b1 = flash_amd_get_size ((uchar *) CFG_BOOTROM_BASE, &flash_info[1]);
 191
 192         if (size_b0 > 0 || size_b1 > 0) {
 193
 194                 printf("(");
 195
 196                 if (size_b0 > 0) {
 197                         puts ("Bank#1 - ");
 198                         print_size (size_b0, (size_b1 > 0) ? ", " : ") ");
 199                 }
 200
 201                 if (size_b1 > 0) {
 202                         puts ("Bank#2 - ");
 203                         print_size (size_b1, ") ");
 204                 }
 205         }
 206         else {
 207                 printf ("## No FLASH found.\n");
 208                 return 0;
 209         }
 210         /* protect monitor and environment sectors
 211          */
 212
 213 #if CFG_MONITOR_BASE >= CFG_BOOTROM_BASE
 214         if (size_b1) {
 215                 /* If U-Boot is booted from ROM the CFG_MONITOR_BASE > CFG_FLASH_BASE
 216                  * but we shouldn't protect it.
 217                  */
 218
 219                 flash_protect  (FLAG_PROTECT_SET,
 220                                 CFG_MONITOR_BASE,
 221                                 CFG_MONITOR_BASE + monitor_flash_len - 1, &flash_info[1]
 222                 );
 223         }
 224 #else
 225 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 226         flash_protect (FLAG_PROTECT_SET,
 227                        CFG_MONITOR_BASE,
 228                        CFG_MONITOR_BASE + monitor_flash_len - 1, &flash_info[0]
 229         );
 230 #endif
 231 #endif
 232
 233 #if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
 234 # ifndef  CFG_ENV_SIZE
 235 #  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
 236 # endif
 237 # if CFG_ENV_ADDR >= CFG_BOOTROM_BASE
 238         if (size_b1) {
 239                 flash_protect (FLAG_PROTECT_SET,
 240                                 CFG_ENV_ADDR,
 241                                 CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[1]);
 242         }
 243 # else
 244         flash_protect (FLAG_PROTECT_SET,
 245                        CFG_ENV_ADDR,
 246                        CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
 247 # endif
 248 #endif
 249
 250         return (size_b0 + size_b1);
 251 }
 252
 253 /*-----------------------------------------------------------------------
 254  */
 255 void flash_print_info (flash_info_t * info)
 256 {
 257         int i;
 258
 259         if (info->flash_id == FLASH_UNKNOWN) {
 260                 printf ("missing or unknown FLASH type\n");
 261                 return;
 262         }
 263
 264         switch ((info->flash_id >> 16) & 0xff) {
 265         case 0x89:
 266                 printf ("INTEL ");
 267                 break;
 268         case 0x1:
 269                 printf ("AMD ");
 270                 break;
 271         default:
 272                 printf ("Unknown Vendor ");
 273                 break;
 274         }
 275
 276         switch (info->flash_id & FLASH_TYPEMASK) {
 277         case FLASH_28F160C3B:
 278                 printf ("28F160C3B (16 Mbit, bottom sector)\n");
 279                 break;
 280         case FLASH_28F160F3B:
 281                 printf ("28F160F3B (16 Mbit, bottom sector)\n");
 282                 break;
 283         case AMD_ID_F040B:
 284                 printf ("AM29F040B (4 Mbit)\n");
 285                 break;
 286         default:
 287                 printf ("Unknown Chip Type\n");
 288                 break;
 289         }
 290
 291         if (info->size < 0x100000)
 292                 printf ("  Size: %ld KB in %d Sectors\n",
 293                                 info->size >> 10, info->sector_count);
 294         else
 295                 printf ("  Size: %ld MB in %d Sectors\n",
 296                                 info->size >> 20, info->sector_count);
 297
 298         printf ("  Sector Start Addresses:");
 299         for (i = 0; i < info->sector_count; ++i) {
 300                 if ((i % 5) == 0)
 301                         printf ("\n   ");
 302                 printf (" %08lX%s",
 303                         info->start[i],
 304                         info->protect[i] ? " (RO)" : "     "
 305                 );
 306         }
 307         printf ("\n");
 308 }
 309
 310 /*-----------------------------------------------------------------------
 311  */
 312 int flash_erase (flash_info_t * info, int s_first, int s_last)
 313 {
 314         vu_char *addr = (vu_char *)(info->start[0]);
 315         int flag, prot, sect, l_sect;
 316         ulong start, now, last;
 317
 318         if ((s_first < 0) || (s_first > s_last)) {
 319                 if (info->flash_id == FLASH_UNKNOWN) {
 320                         printf ("- missing\n");
 321                 } else {
 322                         printf ("- no sectors to erase\n");
 323                 }
 324                 return 1;
 325         }
 326
 327         prot = 0;
 328         for (sect = s_first; sect <= s_last; sect++) {
 329                 if (info->protect[sect])
 330                         prot++;
 331         }
 332
 333         if (prot) {
 334                 printf ("- Warning: %d protected sectors will not be erased!\n",
 335                                 prot);
 336         } else {
 337                 printf ("\n");
 338         }
 339
 340         /* Check the type of erased flash
 341          */
 342         if (info->flash_id >> 16 == 0x1) {
 343                 /* Erase AMD flash
 344                  */
 345                 l_sect = -1;
 346
 347                 /* Disable interrupts which might cause a timeout here */
 348                 flag = disable_interrupts();
 349
 350                 addr[0x0555] = 0xAA;
 351                 addr[0x02AA] = 0x55;
 352                 addr[0x0555] = 0x80;
 353                 addr[0x0555] = 0xAA;
 354                 addr[0x02AA] = 0x55;
 355
 356                 /* wait at least 80us - let's wait 1 ms */
 357                 udelay (1000);
 358
 359                 /* Start erase on unprotected sectors */
 360                 for (sect = s_first; sect<=s_last; sect++) {
 361                         if (info->protect[sect] == 0) { /* not protected */
 362                                 addr = (vu_char *)(info->start[sect]);
 363                                 addr[0] = 0x30;
 364                                 l_sect = sect;
 365                         }
 366                 }
 367
 368                 /* re-enable interrupts if necessary */
 369                 if (flag)
 370                         enable_interrupts();
 371
 372                 /* wait at least 80us - let's wait 1 ms */
 373                 udelay (1000);
 374
 375                 /*
 376                  * We wait for the last triggered sector
 377                  */
 378                 if (l_sect < 0)
 379                         goto AMD_DONE;
 380
 381                 start = get_timer (0);
 382                 last  = start;
 383                 addr = (vu_char *)(info->start[l_sect]);
 384                 while ((addr[0] & 0x80) != 0x80) {
 385                         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 386                                 printf ("Timeout\n");
 387                                 return 1;
 388                         }
 389                         /* show that we're waiting */
 390                         if ((now - last) > 1000) {      /* every second */
 391                                 serial_putc ('.');
 392                                 last = now;
 393                         }
 394                 }
 395
 396 AMD_DONE:
 397                 /* reset to read mode */
 398                 addr = (volatile unsigned char *)info->start[0];
 399                 addr[0] = 0xF0;     /* reset bank */
 400
 401         } else {
 402                 /* Erase Intel flash
 403                  */
 404
 405                 /* Start erase on unprotected sectors
 406                  */
 407                 for (sect = s_first; sect <= s_last; sect++) {
 408                         volatile ulong *addr =
 409                                 (volatile unsigned long *) info->start[sect];
 410
 411                         start = get_timer (0);
 412                         last = start;
 413                         if (info->protect[sect] == 0) {
 414                         /* Disable interrupts which might cause a timeout here
 415                          */
 416                                 flag = disable_interrupts ();
 417
 418                                 /* Erase the block
 419                                  */
 420                                 addr[0] = 0x00200020;
 421                                 addr[1] = 0x00200020;
 422                                 addr[0] = 0x00D000D0;
 423                                 addr[1] = 0x00D000D0;
 424
 425                                 /* re-enable interrupts if necessary
 426                                  */
 427                                 if (flag)
 428                                         enable_interrupts ();
 429
 430                                 /* wait at least 80us - let's wait 1 ms
 431                                  */
 432                                 udelay (1000);
 433
 434                                 last = start;
 435                                 while ((addr[0] & 0x00800080) != 0x00800080 ||
 436                                    (addr[1] & 0x00800080) != 0x00800080) {
 437                                         if ((now = get_timer (start)) > CFG_FLASH_ERASE_TOUT) {
 438                                                 printf ("Timeout (erase suspended!)\n");
 439                                                 /* Suspend erase
 440                                                  */
 441                                                 addr[0] = 0x00B000B0;
 442                                                 addr[1] = 0x00B000B0;
 443                                                 goto DONE;
 444                                         }
 445                                         /* show that we're waiting
 446                                          */
 447                                         if ((now - last) > 1000) {      /* every second */
 448                                                 serial_putc ('.');
 449                                                 last = now;
 450                                         }
 451                                 }
 452                                 if (addr[0] & 0x00220022 || addr[1] & 0x00220022) {
 453                                         printf ("*** ERROR: erase failed!\n");
 454                                         goto DONE;
 455                                 }
 456                         }
 457                         /* Clear status register and reset to read mode
 458                          */
 459                         addr[0] = 0x00500050;
 460                         addr[1] = 0x00500050;
 461                         addr[0] = 0x00FF00FF;
 462                         addr[1] = 0x00FF00FF;
 463                 }
 464         }
 465
 466         printf (" done\n");
 467
 468 DONE:
 469         return 0;
 470 }
 471
 472 static int write_word (flash_info_t *, volatile unsigned long *, ulong);
 473 static int write_byte (flash_info_t *info, ulong dest, uchar data);
 474
 475 /*-----------------------------------------------------------------------
 476  * Copy memory to flash, returns:
 477  * 0 - OK
 478  * 1 - write timeout
 479  * 2 - Flash not erased
 480  */
 481 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 482 {
 483         ulong v;
 484         int i, l, rc, cc = cnt, res = 0;
 485
 486         if (info->flash_id >> 16 == 0x1) {
 487
 488                 /* Write to AMD 8-bit flash
 489                  */
 490                 while (cnt > 0) {
 491                         if ((rc = write_byte(info, addr, *src)) != 0) {
 492                                 return (rc);
 493                         }
 494                         addr++;
 495                         src++;
 496                         cnt--;
 497                 }
 498
 499                 return (0);
 500         } else {
 501
 502                 /* Write to Intel 64-bit flash
 503                  */
 504                 for (v=0; cc > 0; addr += 4, cc -= 4 - l) {
 505                         l = (addr & 3);
 506                         addr &= ~3;
 507
 508                         for (i = 0; i < 4; i++) {
 509                                 v = (v << 8) + (i < l || i - l >= cc ?
 510                                         *((unsigned char *) addr + i) : *src++);
 511                         }
 512
 513                         if ((res = write_word (info, (volatile unsigned long *) addr, v)) != 0)
 514                                 break;
 515                 }
 516         }
 517
 518         return (res);
 519 }
 520
 521 /*-----------------------------------------------------------------------
 522  * Write a word to Flash, returns:
 523  * 0 - OK
 524  * 1 - write timeout
 525  * 2 - Flash not erased
 526  */
 527 static int write_word (flash_info_t * info, volatile unsigned long *addr,
 528                                            ulong data)
 529 {
 530         int flag, res = 0;
 531         ulong start;
 532
 533         /* Check if Flash is (sufficiently) erased
 534          */
 535         if ((*addr & data) != data)
 536                 return (2);
 537
 538         /* Disable interrupts which might cause a timeout here
 539          */
 540         flag = disable_interrupts ();
 541
 542         *addr = 0x00400040;
 543         *addr = data;
 544
 545         /* re-enable interrupts if necessary
 546          */
 547         if (flag)
 548                 enable_interrupts ();
 549
 550         start = get_timer (0);
 551         while ((*addr & 0x00800080) != 0x00800080) {
 552                 if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 553                         /* Suspend program
 554                          */
 555                         *addr = 0x00B000B0;
 556                         res = 1;
 557                         goto OUT;
 558                 }
 559         }
 560
 561         if (*addr & 0x00220022) {
 562                 printf ("*** ERROR: program failed!\n");
 563                 res = 1;
 564         }
 565
 566 OUT:
 567         /* Clear status register and reset to read mode
 568          */
 569         *addr = 0x00500050;
 570         *addr = 0x00FF00FF;
 571
 572         return (res);
 573 }
 574
 575 /*-----------------------------------------------------------------------
 576  * Write a byte to Flash, returns:
 577  * 0 - OK
 578  * 1 - write timeout
 579  * 2 - Flash not erased
 580  */
 581 static int write_byte (flash_info_t *info, ulong dest, uchar data)
 582 {
 583         vu_char *addr = (vu_char *)(info->start[0]);
 584         ulong start;
 585         int flag;
 586
 587         /* Check if Flash is (sufficiently) erased */
 588         if ((*((vu_char *)dest) & data) != data) {
 589                 return (2);
 590         }
 591         /* Disable interrupts which might cause a timeout here */
 592         flag = disable_interrupts();
 593
 594         addr[0x0555] = 0xAA;
 595         addr[0x02AA] = 0x55;
 596         addr[0x0555] = 0xA0;
 597
 598         *((vu_char *)dest) = data;
 599
 600         /* re-enable interrupts if necessary */
 601         if (flag)
 602                 enable_interrupts();
 603
 604         /* data polling for D7 */
 605         start = get_timer (0);
 606         while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
 607                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 608                         return (1);
 609                 }
 610         }
 611         return (0);
 612 }
 613
 614 /*-----------------------------------------------------------------------
 615  */