board/cmi/flash.c

   1 /*
   2  * (C) Copyright 2003
   3  * Martin Winistoerfer, martinwinistoerfer@gmx.ch.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * File:                flash.c
  26  *
  27  * Discription:         This Driver is for 28F320J3A, 28F640J3A and
  28  *                      28F128J3A Intel flashs working in 16 Bit mode.
  29  *                      They are single bank flashs.
  30  *
  31  *                      Most of this code is taken from existing u-boot
  32  *                      source code.
  33  */
  34
  35
  36 #include <common.h>
  37 #include <mpc5xx.h>
  38
  39 #if defined(CONFIG_ENV_IS_IN_FLASH)
  40 # ifndef  CONFIG_ENV_ADDR
  41 #  define CONFIG_ENV_ADDR       (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  42 # endif
  43 # ifndef  CONFIG_ENV_SIZE
  44 #  define CONFIG_ENV_SIZE       CONFIG_ENV_SECT_SIZE
  45 # endif
  46 # ifndef  CONFIG_ENV_SECT_SIZE
  47 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
  48 # endif
  49 #endif
  50
  51 #define FLASH_ID_MASK                   0xFFFF
  52 #define FLASH_BLOCK_SIZE                0x00010000
  53 #define FLASH_CMD_READ_ID               0x0090
  54 #define FLASH_CMD_RESET                 0x00ff
  55 #define FLASH_CMD_BLOCK_ERASE           0x0020
  56 #define FLASH_CMD_ERASE_CONFIRM         0x00D0
  57 #define FLASH_CMD_CLEAR_STATUS          0x0050
  58 #define FLASH_CMD_SUSPEND_ERASE         0x00B0
  59 #define FLASH_CMD_WRITE                 0x0040
  60 #define FLASH_CMD_PROTECT               0x0060
  61 #define FLASH_CMD_PROTECT_SET           0x0001
  62 #define FLASH_CMD_PROTECT_CLEAR         0x00D0
  63 #define FLASH_STATUS_DONE               0x0080
  64
  65 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  66
  67 /*
  68  * Local function prototypes
  69  */
  70 static ulong    flash_get_size          (vu_short *addr, flash_info_t *info);
  71 static int      write_short             (flash_info_t *info, ulong dest, ushort data);
  72 static void     flash_get_offsets       (ulong base, flash_info_t *info);
  73
  74 /*
  75  * Initialize flash
  76  */
  77
  78 unsigned long flash_init (void)
  79 {
  80         unsigned long size_b0;
  81         int i;
  82
  83         /* Init: no FLASHes known */
  84         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
  85                 flash_info[i].flash_id = FLASH_UNKNOWN;
  86         }
  87
  88         /* Static FLASH Bank configuration here - FIXME XXX */
  89 #if 1
  90         debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);
  91 #endif
  92         size_b0 = flash_get_size((vu_short *)FLASH_BASE0_PRELIM, &flash_info[0]);
  93
  94         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  95                 printf ("## Unknown FLASH on Bank 0: "
  96                         "ID 0x%lx, Size = 0x%08lx = %ld MB\n",
  97                         flash_info[0].flash_id,
  98                         size_b0, size_b0<<20);
  99         }
 100
 101         flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
 102
 103         flash_info[0].size = size_b0;
 104
 105 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 106         /* monitor protection ON by default */
 107         flash_protect(FLAG_PROTECT_SET,
 108                       CONFIG_SYS_MONITOR_BASE,
 109                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
 110                       &flash_info[0]);
 111 #endif
 112
 113 #ifdef  CONFIG_ENV_IS_IN_FLASH
 114         /* ENV protection ON by default */
 115         flash_protect(FLAG_PROTECT_SET,
 116                       CONFIG_ENV_ADDR,
 117                       CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
 118                       &flash_info[0]);
 119 #endif
 120
 121         return size_b0;
 122 }
 123
 124 /*
 125  * Compute start adress of each sector (block)
 126  */
 127
 128 static void flash_get_offsets (ulong base, flash_info_t *info)
 129 {
 130         int i;
 131
 132         if (info->flash_id == FLASH_UNKNOWN) {
 133                 return;
 134         }
 135
 136         switch (info->flash_id & FLASH_VENDMASK) {
 137         case FLASH_MAN_INTEL:
 138             for (i = 0; i < info->sector_count; i++) {
 139                 info->start[i] = base + i * FLASH_BLOCK_SIZE;
 140             }
 141             return;
 142
 143         default:
 144             printf ("Don't know sector offsets for flash type 0x%lx\n",
 145                 info->flash_id);
 146             return;
 147         }
 148 }
 149
 150 /*
 151  * Print flash information
 152  */
 153 void flash_print_info  (flash_info_t *info)
 154 {
 155         int i;
 156
 157         if (info->flash_id == FLASH_UNKNOWN) {
 158                 printf ("missing or unknown FLASH type\n");
 159                 return;
 160         }
 161
 162         switch (info->flash_id & FLASH_VENDMASK) {
 163         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 164         case FLASH_MAN_FUJ:     printf ("Fujitsu ");            break;
 165         case FLASH_MAN_SST:     printf ("SST ");                break;
 166         case FLASH_MAN_STM:     printf ("STM ");                break;
 167         case FLASH_MAN_INTEL:   printf ("Intel ");              break;
 168         case FLASH_MAN_MT:      printf ("MT ");                 break;
 169         default:                printf ("Unknown Vendor ");     break;
 170         }
 171
 172         switch (info->flash_id & FLASH_TYPEMASK) {
 173         case FLASH_28F320J3A:   printf ("28F320J3A (32Mbit) 16-Bit\n");
 174                                 break;
 175         case FLASH_28F640J3A:   printf ("28F640J3A (64Mbit) 16-Bit\n");
 176                                 break;
 177         case FLASH_28F128J3A:   printf ("28F128J3A (128Mbit) 16-Bit\n");
 178                                 break;
 179         default:                printf ("Unknown Chip Type\n");
 180                                 break;
 181         }
 182
 183         if (info->size >= (1 << 20)) {
 184                 i = 20;
 185         } else {
 186                 i = 10;
 187         }
 188         printf ("  Size: %ld %cB in %d Sectors\n",
 189                 info->size >> i,
 190                 (i == 20) ? 'M' : 'k',
 191                 info->sector_count);
 192
 193         printf ("  Sector Start Addresses:");
 194         for (i=0; i<info->sector_count; ++i) {
 195                 if ((i % 5) == 0)
 196                         printf ("\n   ");
 197                 printf (" %08lX%s",
 198                         info->start[i],
 199                         info->protect[i] ? " (RO)" : "     "
 200                 );
 201         }
 202         printf ("\n");
 203         return;
 204 }
 205
 206 /*
 207  * Get size of flash in bytes.
 208  * The following code cannot be run from FLASH!
 209  */
 210
 211 static ulong flash_get_size (vu_short *addr, flash_info_t *info)
 212 {
 213         vu_short value;
 214
 215         /* Read Manufacturer ID */
 216         addr[0] = FLASH_CMD_READ_ID;
 217         value = addr[0];
 218
 219         switch (value) {
 220         case (AMD_MANUFACT & FLASH_ID_MASK):
 221                 info->flash_id = FLASH_MAN_AMD;
 222                 break;
 223         case (FUJ_MANUFACT & FLASH_ID_MASK):
 224                 info->flash_id = FLASH_MAN_FUJ;
 225                 break;
 226         case (SST_MANUFACT & FLASH_ID_MASK):
 227                 info->flash_id = FLASH_MAN_SST;
 228                 break;
 229         case (STM_MANUFACT & FLASH_ID_MASK):
 230                 info->flash_id = FLASH_MAN_STM;
 231                 break;
 232         case (INTEL_MANUFACT & FLASH_ID_MASK):
 233                 info->flash_id = FLASH_MAN_INTEL;
 234                 break;
 235         default:
 236                 info->flash_id = FLASH_UNKNOWN;
 237                 info->sector_count = 0;
 238                 info->size = 0;
 239                 addr[0] = FLASH_CMD_RESET;      /* restore read mode */
 240                 return (0);                     /* no or unknown flash  */
 241         }
 242
 243         value = addr[1];                        /* device ID            */
 244
 245         switch (value) {
 246         case (INTEL_ID_28F320J3A  & FLASH_ID_MASK):
 247                 info->flash_id += FLASH_28F320J3A;
 248                 info->sector_count = 32;
 249                 info->size = 0x00400000;
 250                 break;                          /* =>  32 MBit          */
 251
 252         case (INTEL_ID_28F640J3A & FLASH_ID_MASK):
 253                 info->flash_id += FLASH_28F640J3A;
 254                 info->sector_count = 64;
 255                 info->size = 0x00800000;
 256                 break;                          /* => 64 MBit           */
 257
 258         case (INTEL_ID_28F128J3A & FLASH_ID_MASK):
 259                 info->flash_id += FLASH_28F128J3A;
 260                 info->sector_count = 128;
 261                 info->size = 0x01000000;
 262                 break;                          /* => 128 MBit          */
 263
 264         default:
 265                 info->flash_id = FLASH_UNKNOWN;
 266                 addr[0] = FLASH_CMD_RESET;      /* restore read mode */
 267                 return (0);                     /* => no or unknown flash */
 268
 269         }
 270
 271         if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 272                 printf ("** ERROR: sector count %d > max (%d) **\n",
 273                         info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 274                 info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 275         }
 276
 277         addr[0] = FLASH_CMD_RESET;              /* restore read mode */
 278
 279         return (info->size);
 280 }
 281
 282
 283 /*
 284  * Erase unprotected sectors
 285  */
 286
 287 int flash_erase (flash_info_t *info, int s_first, int s_last)
 288 {
 289         int flag, prot, sect;
 290         ulong start, now, last;
 291
 292         if ((s_first < 0) || (s_first > s_last)) {
 293                 if (info->flash_id == FLASH_UNKNOWN) {
 294                         printf ("- missing\n");
 295                 } else {
 296                         printf ("- no sectors to erase\n");
 297                 }
 298                 return 1;
 299         }
 300
 301         if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
 302                 printf ("Can erase only Intel flash types - aborted\n");
 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         start = get_timer (0);
 321         last  = start;
 322
 323         /* Start erase on unprotected sectors */
 324         for (sect = s_first; sect<=s_last; sect++) {
 325                 if (info->protect[sect] == 0) { /* not protected */
 326                         vu_short *addr = (vu_short *)(info->start[sect]);
 327                         unsigned long status;
 328
 329                         /* Disable interrupts which might cause a timeout here */
 330                         flag = disable_interrupts();
 331
 332 #ifdef DEBUG
 333                         printf("Erase sector %d at start addr 0x%08X", sect, (unsigned int)info->start[sect]);
 334 #endif
 335
 336                         *addr = FLASH_CMD_CLEAR_STATUS;
 337                         *addr = FLASH_CMD_BLOCK_ERASE;
 338                         *addr = FLASH_CMD_ERASE_CONFIRM;
 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                         while (((status = *addr) & FLASH_STATUS_DONE) != FLASH_STATUS_DONE) {
 348                                 if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 349                                         printf("Flash erase timeout at address %lx\n", info->start[sect]);
 350                                         *addr = FLASH_CMD_SUSPEND_ERASE;
 351                                         *addr = FLASH_CMD_RESET;
 352                                         return 1;
 353                                 }
 354
 355                                 /* show that we're waiting */
 356                                 if ((now - last) > 1000) {      /* every second */
 357                                         putc ('.');
 358                                         last = now;
 359                                 }
 360                         }
 361                         *addr = FLASH_CMD_RESET;
 362                 }
 363         }
 364         printf (" done\n");
 365         return 0;
 366 }
 367
 368 /*
 369  * Copy memory to flash, returns:
 370  * 0 - OK
 371  * 1 - write timeout
 372  * 2 - Flash not erased
 373  * 4 - Flash not identified
 374  */
 375
 376 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 377 {
 378         ulong cp, wp;
 379         ushort data;
 380         int i, rc;
 381
 382         if (info->flash_id == FLASH_UNKNOWN) {
 383                 return 4;
 384         }
 385
 386         wp = (addr & ~1);       /* get lower word aligned address */
 387
 388         /*
 389          * handle unaligned start byte
 390          */
 391
 392         if (addr - wp) {
 393                 data = 0;
 394                 data = (data << 8) | *src++;
 395                 --cnt;
 396                 if ((rc = write_short(info, wp, data)) != 0) {
 397                         return (rc);
 398                 }
 399                 wp += 2;
 400         }
 401
 402         /*
 403          * handle word aligned part
 404          */
 405
 406         while (cnt >= 2) {
 407                 data = 0;
 408                 for (i=0; i<2; ++i) {
 409                         data = (data << 8) | *src++;
 410                 }
 411
 412                 if ((rc = write_short(info, wp, data)) != 0) {
 413                         return (rc);
 414                 }
 415                 wp  += 2;
 416                 cnt -= 2;
 417         }
 418
 419         if (cnt == 0) {
 420                 return (0);
 421         }
 422
 423         /*
 424          * handle unaligned tail bytes
 425          */
 426
 427         data = 0;
 428         for (i=0, cp=wp; i<2 && cnt>0; ++i, ++cp) {
 429                 data = (data << 8) | *src++;
 430                 --cnt;
 431         }
 432         for (; i<2; ++i, ++cp) {
 433                 data = (data << 8) | (*(uchar *)cp);
 434         }
 435
 436         return (write_short(info, wp, data));
 437
 438 }
 439
 440 /*
 441  * Write 16 bit (short) to flash
 442  */
 443
 444 static int write_short (flash_info_t *info, ulong dest, ushort data)
 445 {
 446         vu_short *addr = (vu_short*)(info->start[0]);
 447         ulong start;
 448         int flag;
 449
 450         /* Check if Flash is (sufficiently) erased */
 451         if ((*((vu_short *)dest) & data) != data) {
 452                 return (2);
 453         }
 454
 455         /* Disable interrupts which might cause a timeout here */
 456         flag = disable_interrupts();
 457
 458         if (!(info->flash_id & FLASH_VENDMASK)) {
 459                 return 4;
 460         }
 461         *addr = FLASH_CMD_ERASE_CONFIRM;
 462         *addr = FLASH_CMD_WRITE;
 463
 464         *((vu_short *)dest) = data;
 465
 466         /* re-enable interrupts if necessary */
 467         if (flag) {
 468                 enable_interrupts();
 469         }
 470
 471         /* data polling for D7 */
 472         start = get_timer (0);
 473
 474         /* wait for error or finish */
 475         while(!(addr[0] & FLASH_STATUS_DONE)){
 476                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 477                         addr[0] = FLASH_CMD_RESET;
 478                         return (1);
 479                 }
 480         }
 481
 482         *addr = FLASH_CMD_RESET;
 483         return (0);
 484 }
 485
 486 /*
 487  * Protects a flash sector
 488  */
 489
 490 int flash_real_protect(flash_info_t *info, long sector, int prot)
 491 {
 492         vu_short *addr = (vu_short*)(info->start[sector]);
 493         ulong start;
 494
 495         *addr = FLASH_CMD_CLEAR_STATUS;
 496         *addr = FLASH_CMD_PROTECT;
 497
 498         if(prot) {
 499                 *addr = FLASH_CMD_PROTECT_SET;
 500         } else {
 501                 *addr = FLASH_CMD_PROTECT_CLEAR;
 502         }
 503
 504         /* wait for error or finish */
 505         start = get_timer (0);
 506         while(!(addr[0] & FLASH_STATUS_DONE)){
 507                 if (get_timer(start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 508                         printf("Flash protect timeout at address %lx\n",  info->start[sector]);
 509                         addr[0] = FLASH_CMD_RESET;
 510                         return (1);
 511                 }
 512         }
 513         /* Set software protect flag */
 514         info->protect[sector] = prot;
 515         *addr = FLASH_CMD_RESET;
 516         return (0);
 517 }