board/lpd7a40x/flash.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * (C) Copyright 2002
   7  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 /* #define DEBUG */
  29
  30 #include <common.h>
  31 #include <environment.h>
  32
  33 #define FLASH_BANK_SIZE 0x1000000       /* 16MB (2 x 8 MB) */
  34 #define MAIN_SECT_SIZE  0x40000         /* 256KB (2 x 128kB) */
  35
  36 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
  37
  38
  39 #define CMD_READ_ARRAY          0x00FF00FF
  40 #define CMD_IDENTIFY            0x00900090
  41 #define CMD_ERASE_SETUP         0x00200020
  42 #define CMD_ERASE_CONFIRM       0x00D000D0
  43 #define CMD_PROGRAM             0x00400040
  44 #define CMD_RESUME              0x00D000D0
  45 #define CMD_SUSPEND             0x00B000B0
  46 #define CMD_STATUS_READ         0x00700070
  47 #define CMD_STATUS_RESET        0x00500050
  48
  49 #define BIT_BUSY                0x00800080
  50 #define BIT_ERASE_SUSPEND       0x00400040
  51 #define BIT_ERASE_ERROR         0x00200020
  52 #define BIT_PROGRAM_ERROR       0x00100010
  53 #define BIT_VPP_RANGE_ERROR     0x00080008
  54 #define BIT_PROGRAM_SUSPEND     0x00040004
  55 #define BIT_PROTECT_ERROR       0x00020002
  56 #define BIT_UNDEFINED           0x00010001
  57
  58 #define BIT_SEQUENCE_ERROR      0x00300030
  59 #define BIT_TIMEOUT             0x80000000
  60
  61 /*-----------------------------------------------------------------------
  62  */
  63
  64 ulong flash_init (void)
  65 {
  66         int i, j;
  67         ulong size = 0;
  68
  69         for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
  70                 ulong flashbase = 0;
  71
  72                 flash_info[i].flash_id =
  73                         (INTEL_MANUFACT     & FLASH_VENDMASK) |
  74                         (INTEL_ID_28F640J3A & FLASH_TYPEMASK);
  75                 flash_info[i].size = FLASH_BANK_SIZE;
  76                 flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
  77                 memset (flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
  78                 if (i == 0)
  79                         flashbase = CFG_FLASH_BASE;
  80                 else
  81                         panic ("configured too many flash banks!\n");
  82                 for (j = 0; j < flash_info[i].sector_count; j++) {
  83                         flash_info[i].start[j] = flashbase;
  84
  85                         /* uniform sector size */
  86                         flashbase += MAIN_SECT_SIZE;
  87                 }
  88                 size += flash_info[i].size;
  89         }
  90
  91         /*
  92          * Protect monitor and environment sectors
  93          */
  94         flash_protect ( FLAG_PROTECT_SET,
  95                         CFG_FLASH_BASE,
  96                         CFG_FLASH_BASE + monitor_flash_len - 1,
  97                         &flash_info[0]);
  98
  99         flash_protect ( FLAG_PROTECT_SET,
 100                         CFG_ENV_ADDR,
 101                         CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
 102
 103 #ifdef CFG_ENV_ADDR_REDUND
 104         flash_protect ( FLAG_PROTECT_SET,
 105                         CFG_ENV_ADDR_REDUND,
 106                         CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1,
 107                         &flash_info[0]);
 108 #endif
 109
 110         return size;
 111 }
 112
 113 /*-----------------------------------------------------------------------
 114  */
 115 void flash_print_info (flash_info_t * info)
 116 {
 117         int i;
 118
 119         switch (info->flash_id & FLASH_VENDMASK) {
 120         case (INTEL_MANUFACT & FLASH_VENDMASK):
 121                 printf ("Intel: ");
 122                 break;
 123         default:
 124                 printf ("Unknown Vendor ");
 125                 break;
 126         }
 127
 128         switch (info->flash_id & FLASH_TYPEMASK) {
 129         case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
 130                 printf ("2x 28F640J3A (64Mbit)\n");
 131                 break;
 132         default:
 133                 printf ("Unknown Chip Type\n");
 134                 return;
 135                 break;
 136         }
 137
 138         printf ("  Size: %ld MB in %d Sectors\n",
 139                         info->size >> 20, info->sector_count);
 140
 141         printf ("  Sector Start Addresses:");
 142         for (i = 0; i < info->sector_count; i++) {
 143                 if ((i % 5) == 0) {
 144                         printf ("\n   ");
 145                 }
 146                 printf (" %08lX%s",
 147                         info->start[i],
 148                         info->protect[i] ? " (RO)" : "     ");
 149         }
 150         printf ("\n");
 151 }
 152
 153 /*-----------------------------------------------------------------------
 154  */
 155
 156 int flash_error (ulong code)
 157 {
 158         /* Check bit patterns */
 159         /* SR.7=0 is busy, SR.7=1 is ready */
 160         /* all other flags indicate error on 1 */
 161         /* SR.0 is undefined */
 162         /* Timeout is our faked flag */
 163
 164         /* sequence is described in Intel 290644-005 document */
 165
 166         /* check Timeout */
 167         if (code & BIT_TIMEOUT) {
 168                 puts ("Timeout\n");
 169                 return ERR_TIMOUT;
 170         }
 171
 172         /* check Busy, SR.7 */
 173         if (~code & BIT_BUSY) {
 174                 puts ("Busy\n");
 175                 return ERR_PROG_ERROR;
 176         }
 177
 178         /* check Vpp low, SR.3 */
 179         if (code & BIT_VPP_RANGE_ERROR) {
 180                 puts ("Vpp range error\n");
 181                 return ERR_PROG_ERROR;
 182         }
 183
 184         /* check Device Protect Error, SR.1 */
 185         if (code & BIT_PROTECT_ERROR) {
 186                 puts ("Device protect error\n");
 187                 return ERR_PROG_ERROR;
 188         }
 189
 190         /* check Command Seq Error, SR.4 & SR.5 */
 191         if (code & BIT_SEQUENCE_ERROR) {
 192                 puts ("Command seqence error\n");
 193                 return ERR_PROG_ERROR;
 194         }
 195
 196         /* check Block Erase Error, SR.5 */
 197         if (code & BIT_ERASE_ERROR) {
 198                 puts ("Block erase error\n");
 199                 return ERR_PROG_ERROR;
 200         }
 201
 202         /* check Program Error, SR.4 */
 203         if (code & BIT_PROGRAM_ERROR) {
 204                 puts ("Program error\n");
 205                 return ERR_PROG_ERROR;
 206         }
 207
 208         /* check Block Erase Suspended, SR.6 */
 209         if (code & BIT_ERASE_SUSPEND) {
 210                 puts ("Block erase suspended\n");
 211                 return ERR_PROG_ERROR;
 212         }
 213
 214         /* check Program Suspended, SR.2 */
 215         if (code & BIT_PROGRAM_SUSPEND) {
 216                 puts ("Program suspended\n");
 217                 return ERR_PROG_ERROR;
 218         }
 219
 220         /* OK, no error */
 221         return ERR_OK;
 222 }
 223
 224 /*-----------------------------------------------------------------------
 225  */
 226
 227 int flash_erase (flash_info_t * info, int s_first, int s_last)
 228 {
 229         ulong result, result1;
 230         int iflag, prot, sect;
 231         int rc = ERR_OK;
 232
 233 #ifdef USE_920T_MMU
 234         int cflag;
 235 #endif
 236
 237         debug ("flash_erase: s_first %d  s_last %d\n", s_first, s_last);
 238
 239         /* first look for protection bits */
 240
 241         if (info->flash_id == FLASH_UNKNOWN)
 242                 return ERR_UNKNOWN_FLASH_TYPE;
 243
 244         if ((s_first < 0) || (s_first > s_last)) {
 245                 return ERR_INVAL;
 246         }
 247
 248         if ((info->flash_id & FLASH_VENDMASK) !=
 249                 (INTEL_MANUFACT & FLASH_VENDMASK)) {
 250                 return ERR_UNKNOWN_FLASH_VENDOR;
 251         }
 252
 253         prot = 0;
 254         for (sect = s_first; sect <= s_last; ++sect) {
 255                 if (info->protect[sect]) {
 256                         prot++;
 257                 }
 258         }
 259
 260         if (prot) {
 261                 printf ("- Warning: %d protected sectors will not be erased!\n",
 262                         prot);
 263         } else {
 264                 printf ("\n");
 265         }
 266
 267         /*
 268          * Disable interrupts which might cause a timeout
 269          * here. Remember that our exception vectors are
 270          * at address 0 in the flash, and we don't want a
 271          * (ticker) exception to happen while the flash
 272          * chip is in programming mode.
 273          */
 274 #ifdef USE_920T_MMU
 275         cflag = dcache_status ();
 276         dcache_disable ();
 277 #endif
 278         iflag = disable_interrupts ();
 279
 280         /* Start erase on unprotected sectors */
 281         for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
 282
 283                 debug ("Erasing sector %2d @ %08lX... ",
 284                         sect, info->start[sect]);
 285
 286                 /* arm simple, non interrupt dependent timer */
 287                 reset_timer();
 288
 289                 if (info->protect[sect] == 0) { /* not protected */
 290                         vu_long *addr = (vu_long *) (info->start[sect]);
 291                         ulong bsR7, bsR7_2, bsR5, bsR5_2;
 292                         ulong tstart;
 293
 294                         /* *addr = CMD_STATUS_RESET; */
 295                         *addr = CMD_ERASE_SETUP;
 296                         *addr = CMD_ERASE_CONFIRM;
 297
 298                         /* wait until flash is ready */
 299                         tstart = get_timer(0);
 300                         do {
 301                                 ulong now;
 302                                 /* check timeout */
 303                                 /*if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) { */
 304                                 if ((now = get_timer(tstart)) > CFG_FLASH_ERASE_TOUT) {
 305                                         printf("tstart = 0x%08lx, now = 0x%08lx\n", tstart, now);
 306                                         *addr = CMD_STATUS_RESET;
 307                                         result = BIT_TIMEOUT;
 308                                         break;
 309                                 }
 310
 311                                 *addr = CMD_STATUS_READ;
 312                                 result = *addr;
 313                                 bsR7 = result & (1 << 7);
 314                                 bsR7_2 = result & (1 << 23);
 315                         } while (!bsR7 | !bsR7_2);
 316
 317                         *addr = CMD_STATUS_READ;
 318                         result1 = *addr;
 319                         bsR5 = result1 & (1 << 5);
 320                         bsR5_2 = result1 & (1 << 21);
 321 #ifdef SAMSUNG_FLASH_DEBUG
 322                         printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
 323                         if (bsR5 != 0 && bsR5_2 != 0)
 324                                 printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
 325 #endif
 326
 327                         *addr = CMD_READ_ARRAY;
 328                         *addr = CMD_RESUME;
 329
 330                         if ((rc = flash_error (result)) != ERR_OK)
 331                                 goto outahere;
 332 #if 0
 333                         printf ("ok.\n");
 334                 } else {                /* it was protected */
 335
 336                         printf ("protected!\n");
 337 #endif
 338                 }
 339         }
 340
 341 outahere:
 342         /* allow flash to settle - wait 10 ms */
 343         udelay_masked (10000);
 344
 345         if (iflag)
 346                 enable_interrupts ();
 347
 348 #ifdef USE_920T_MMU
 349         if (cflag)
 350                 dcache_enable ();
 351 #endif
 352         return rc;
 353 }
 354
 355 /*-----------------------------------------------------------------------
 356  * Copy memory to flash
 357  */
 358
 359 volatile static int write_word (flash_info_t * info, ulong dest,
 360                                                                 ulong data)
 361 {
 362         vu_long *addr = (vu_long *) dest;
 363         ulong result;
 364         int rc = ERR_OK;
 365         int iflag;
 366
 367 #ifdef USE_920T_MMU
 368         int cflag;
 369 #endif
 370
 371         /*
 372          * Check if Flash is (sufficiently) erased
 373          */
 374         result = *addr;
 375         if ((result & data) != data)
 376                 return ERR_NOT_ERASED;
 377
 378         /*
 379          * Disable interrupts which might cause a timeout
 380          * here. Remember that our exception vectors are
 381          * at address 0 in the flash, and we don't want a
 382          * (ticker) exception to happen while the flash
 383          * chip is in programming mode.
 384          */
 385 #ifdef USE_920T_MMU
 386         cflag = dcache_status ();
 387         dcache_disable ();
 388 #endif
 389         iflag = disable_interrupts ();
 390
 391         /* *addr = CMD_STATUS_RESET; */
 392         *addr = CMD_PROGRAM;
 393         *addr = data;
 394
 395         /* arm simple, non interrupt dependent timer */
 396         reset_timer_masked ();
 397
 398         /* wait until flash is ready */
 399         do {
 400                 /* check timeout */
 401                 if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
 402                         *addr = CMD_SUSPEND;
 403                         result = BIT_TIMEOUT;
 404                         break;
 405                 }
 406
 407                 *addr = CMD_STATUS_READ;
 408                 result = *addr;
 409         } while (~result & BIT_BUSY);
 410
 411         /* *addr = CMD_READ_ARRAY; */
 412         *addr = CMD_STATUS_READ;
 413         result = *addr;
 414
 415         rc = flash_error (result);
 416
 417         if (iflag)
 418                 enable_interrupts ();
 419
 420 #ifdef USE_920T_MMU
 421         if (cflag)
 422                 dcache_enable ();
 423 #endif
 424         *addr = CMD_READ_ARRAY;
 425         *addr = CMD_RESUME;
 426         return rc;
 427 }
 428
 429 /*-----------------------------------------------------------------------
 430  * Copy memory to flash.
 431  */
 432
 433 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 434 {
 435         ulong cp, wp, data;
 436         int l;
 437         int i, rc;
 438
 439         wp = (addr & ~3);                       /* get lower word aligned address */
 440
 441         /*
 442          * handle unaligned start bytes
 443          */
 444         if ((l = addr - wp) != 0) {
 445                 data = 0;
 446                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 447                         data = (data >> 8) | (*(uchar *) cp << 24);
 448                 }
 449                 for (; i < 4 && cnt > 0; ++i) {
 450                         data = (data >> 8) | (*src++ << 24);
 451                         --cnt;
 452                         ++cp;
 453                 }
 454                 for (; cnt == 0 && i < 4; ++i, ++cp) {
 455                         data = (data >> 8) | (*(uchar *) cp << 24);
 456                 }
 457
 458                 if ((rc = write_word (info, wp, data)) != 0) {
 459                         return (rc);
 460                 }
 461                 wp += 4;
 462         }
 463
 464         /*
 465          * handle word aligned part
 466          */
 467         while (cnt >= 4) {
 468                 data = *((vu_long *) src);
 469                 if ((rc = write_word (info, wp, data)) != 0) {
 470                         return (rc);
 471                 }
 472                 src += 4;
 473                 wp += 4;
 474                 cnt -= 4;
 475         }
 476
 477         if (cnt == 0) {
 478                 return ERR_OK;
 479         }
 480
 481         /*
 482          * handle unaligned tail bytes
 483          */
 484         data = 0;
 485         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 486                 data = (data >> 8) | (*src++ << 24);
 487                 --cnt;
 488         }
 489         for (; i < 4; ++i, ++cp) {
 490                 data = (data >> 8) | (*(uchar *) cp << 24);
 491         }
 492
 493         return write_word (info, wp, data);
 494 }