board/RPXClassic/flash.c

   1 /*
   2  * (C)  Copyright 2001
   3  * Stäubli Faverges - <www.staubli.com>
   4  * Pierre AUBERT  p.aubert@staubli.com
   5  * U-Boot port on RPXClassic LF (CLLF_BW31) board
   6  *
   7  * RPXClassic uses Am29DL323B flash memory with 2 banks
   8  *
   9  *
  10  * (C) Copyright 2000
  11  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  12  *
  13  * See file CREDITS for list of people who contributed to this
  14  * project.
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License as
  18  * published by the Free Software Foundation; either version 2 of
  19  * the License, or (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  * MA 02111-1307 USA
  30  */
  31
  32
  33 #include <common.h>
  34 #include <mpc8xx.h>
  35
  36 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
  37
  38 /*-----------------------------------------------------------------------
  39  * Functions
  40  */
  41 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  42 static int write_word (flash_info_t *info, ulong dest, ulong data);
  43 static void flash_get_offsets (ulong base, flash_info_t *info);
  44
  45 /*-----------------------------------------------------------------------
  46  */
  47
  48 unsigned long flash_init (void)
  49 {
  50         unsigned long size_b0 ;
  51         int i;
  52
  53         /* Init: no FLASHes known */
  54         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
  55                 flash_info[i].flash_id = FLASH_UNKNOWN;
  56         }
  57
  58         size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  59
  60
  61         flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  62
  63 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  64         /* monitor protection ON by default */
  65         flash_protect(FLAG_PROTECT_SET,
  66                       CONFIG_SYS_MONITOR_BASE,
  67                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  68                       &flash_info[0]);
  69 #endif
  70
  71         flash_info[0].size = size_b0;
  72
  73         return (size_b0);
  74 }
  75
  76 /*-----------------------------------------------------------------------
  77  */
  78 static void flash_get_offsets (ulong base, flash_info_t *info)
  79 {
  80         int i;
  81
  82         if (info->flash_id & FLASH_BTYPE) {
  83                 /* set sector offsets for bottom boot block type        */
  84                 info->start[0] = base + 0x00000000;
  85                 info->start[1] = base + 0x00008000;
  86                 info->start[2] = base + 0x00010000;
  87                 info->start[3] = base + 0x00018000;
  88                 info->start[4] = base + 0x00020000;
  89                 info->start[5] = base + 0x00028000;
  90                 info->start[6] = base + 0x00030000;
  91                 info->start[7] = base + 0x00038000;
  92                 for (i = 8; i < info->sector_count; i++) {
  93                         info->start[i] = base + ((i-7) * 0x00040000) ;
  94                 }
  95         }
  96 }
  97
  98 /*-----------------------------------------------------------------------
  99  */
 100 void flash_print_info  (flash_info_t *info)
 101 {
 102         int i;
 103
 104         if (info->flash_id == FLASH_UNKNOWN) {
 105                 printf ("missing or unknown FLASH type\n");
 106                 return;
 107         }
 108
 109         switch (info->flash_id & FLASH_VENDMASK) {
 110         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 111         default:                printf ("Unknown Vendor ");     break;
 112         }
 113
 114         switch (info->flash_id & FLASH_TYPEMASK) {
 115         case FLASH_AMDL323B:
 116             printf ("AMDL323DB (16 Mbytes, bottom boot sect)\n");
 117             break;
 118         default:
 119             printf ("Unknown Chip Type\n");
 120             break;
 121         }
 122
 123         printf ("  Size: %ld MB in %d Sectors\n",
 124                 info->size >> 20, info->sector_count);
 125
 126         printf ("  Sector Start Addresses:");
 127         for (i=0; i<info->sector_count; ++i) {
 128                 if ((i % 5) == 0)
 129                         printf ("\n   ");
 130                 printf (" %08lX%s",
 131                         info->start[i],
 132                         info->protect[i] ? " (RO)" : "     "
 133                 );
 134         }
 135         printf ("\n");
 136 }
 137
 138 /*-----------------------------------------------------------------------
 139  */
 140
 141
 142 /*-----------------------------------------------------------------------
 143  */
 144
 145 /*
 146  * The following code cannot be run from FLASH!
 147  */
 148
 149 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 150 {
 151         short i;
 152         ulong value;
 153         ulong base = (ulong)addr;
 154
 155         /* Reset flash componeny                                             */
 156         addr [0] = 0xf0f0f0f0;
 157
 158         /* Write auto select command: read Manufacturer ID */
 159         addr[0xAAA] = 0xAAAAAAAA ;
 160         addr[0x555] = 0x55555555 ;
 161         addr[0xAAA] = 0x90909090 ;
 162
 163         value = addr[0] ;
 164
 165         switch (value & 0x00FF00FF) {
 166         case AMD_MANUFACT:
 167                 info->flash_id = FLASH_MAN_AMD;
 168                 break;
 169         default:
 170                 info->flash_id = FLASH_UNKNOWN;
 171                 info->sector_count = 0;
 172                 info->size = 0;
 173                 return (0);                     /* no or unknown flash  */
 174         }
 175
 176         value = addr[2] ;               /* device ID            */
 177
 178         switch (value & 0x00FF00FF) {
 179         case (AMD_ID_DL323B & 0x00FF00FF):
 180             info->flash_id += FLASH_AMDL323B;
 181             info->sector_count = 71;
 182             info->size = 0x01000000;            /* 16 Mb                     */
 183
 184             break;
 185         default:
 186                 info->flash_id = FLASH_UNKNOWN;
 187                 return (0);                     /* => no or unknown flash */
 188
 189         }
 190         /* set up sector start address table */
 191         /* set sector offsets for bottom boot block type        */
 192         info->start[0] = base + 0x00000000;
 193         info->start[1] = base + 0x00008000;
 194         info->start[2] = base + 0x00010000;
 195         info->start[3] = base + 0x00018000;
 196         info->start[4] = base + 0x00020000;
 197         info->start[5] = base + 0x00028000;
 198         info->start[6] = base + 0x00030000;
 199         info->start[7] = base + 0x00038000;
 200         for (i = 8; i < info->sector_count; i++) {
 201             info->start[i] = base + ((i-7) * 0x00040000) ;
 202         }
 203
 204         /* check for protected sectors */
 205         for (i = 0; i < 23; i++) {
 206             /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 207             /* D0 = 1 if protected */
 208             addr = (volatile unsigned long *)(info->start[i]);
 209             info->protect[i] = addr[4] & 1 ;
 210         }
 211         /* Check for protected sectors in the 2nd bank                       */
 212         addr[0x100AAA] = 0xAAAAAAAA ;
 213         addr[0x100555] = 0x55555555 ;
 214         addr[0x100AAA] = 0x90909090 ;
 215
 216         for (i = 23; i < info->sector_count; i++) {
 217             /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 218             /* D0 = 1 if protected */
 219             addr = (volatile unsigned long *)(info->start[i]);
 220             info->protect[i] = addr[4] & 1 ;
 221         }
 222
 223         /*
 224          * Prevent writes to uninitialized FLASH.
 225          */
 226         if (info->flash_id != FLASH_UNKNOWN) {
 227                 addr = (volatile unsigned long *)info->start[0];
 228
 229                 *addr = 0xF0F0F0F0;     /* reset bank 1                      */
 230                 addr = (volatile unsigned long *)info->start[23];
 231
 232                 *addr = 0xF0F0F0F0;     /* reset bank 2                      */
 233
 234         }
 235
 236         return (info->size);
 237 }
 238
 239
 240 /*-----------------------------------------------------------------------
 241  */
 242
 243 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 244 {
 245         vu_long *addr = (vu_long*)(info->start[0]);
 246         int flag, prot, sect, l_sect;
 247         ulong start, now, last;
 248
 249         if ((s_first < 0) || (s_first > s_last)) {
 250                 if (info->flash_id == FLASH_UNKNOWN) {
 251                         printf ("- missing\n");
 252                 } else {
 253                         printf ("- no sectors to erase\n");
 254                 }
 255                 return 1;
 256         }
 257
 258         if ((info->flash_id == FLASH_UNKNOWN) ||
 259             (info->flash_id > FLASH_AMD_COMP)) {
 260                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 261                         info->flash_id);
 262                 return 1;
 263         }
 264
 265         prot = 0;
 266         for (sect=s_first; sect<=s_last; ++sect) {
 267                 if (info->protect[sect]) {
 268                         prot++;
 269                 }
 270         }
 271
 272         if (prot) {
 273                 printf ("- Warning: %d protected sectors will not be erased!\n",
 274                         prot);
 275         } else {
 276                 printf ("\n");
 277         }
 278
 279         l_sect = -1;
 280
 281         /* Disable interrupts which might cause a timeout here */
 282         flag = disable_interrupts();
 283
 284         addr[0xAAA] = 0xAAAAAAAA;
 285         addr[0x555] = 0x55555555;
 286         addr[0xAAA] = 0x80808080;
 287         addr[0xAAA] = 0xAAAAAAAA;
 288         addr[0x555] = 0x55555555;
 289
 290         /* Start erase on unprotected sectors */
 291         for (sect = s_first; sect<=s_last; sect++) {
 292                 if (info->protect[sect] == 0) { /* not protected */
 293                         addr = (vu_long *)(info->start[sect]) ;
 294                         addr[0] = 0x30303030 ;
 295                         l_sect = sect;
 296                 }
 297         }
 298
 299         /* re-enable interrupts if necessary */
 300         if (flag)
 301                 enable_interrupts();
 302
 303         /* wait at least 80us - let's wait 1 ms */
 304         udelay (1000);
 305
 306         /*
 307          * We wait for the last triggered sector
 308          */
 309         if (l_sect < 0)
 310                 goto DONE;
 311
 312         start = get_timer (0);
 313         last  = start;
 314         addr = (vu_long *)(info->start[l_sect]);
 315         while ((addr[0] & 0x80808080) != 0x80808080) {
 316                 if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 317                         printf ("Timeout\n");
 318                         return 1;
 319                 }
 320                 /* show that we're waiting */
 321                 if ((now - last) > 1000) {      /* every second */
 322                         putc ('.');
 323                         last = now;
 324                 }
 325         }
 326
 327 DONE:
 328         /* reset to read mode */
 329         addr = (vu_long *)info->start[0];
 330         addr[0] = 0xF0F0F0F0;   /* reset bank */
 331
 332         printf (" done\n");
 333         return 0;
 334 }
 335
 336 /*-----------------------------------------------------------------------
 337  * Copy memory to flash, returns:
 338  * 0 - OK
 339  * 1 - write timeout
 340  * 2 - Flash not erased
 341  */
 342
 343 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 344 {
 345         ulong cp, wp, data;
 346         int i, l, rc;
 347
 348         wp = (addr & ~3);       /* get lower word aligned address */
 349
 350         /*
 351          * handle unaligned start bytes
 352          */
 353         if ((l = addr - wp) != 0) {
 354                 data = 0;
 355                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 356                         data = (data << 8) | (*(uchar *)cp);
 357                 }
 358                 for (; i<4 && cnt>0; ++i) {
 359                         data = (data << 8) | *src++;
 360                         --cnt;
 361                         ++cp;
 362                 }
 363                 for (; cnt==0 && i<4; ++i, ++cp) {
 364                         data = (data << 8) | (*(uchar *)cp);
 365                 }
 366
 367                 if ((rc = write_word(info, wp, data)) != 0) {
 368                         return (rc);
 369                 }
 370                 wp += 4;
 371         }
 372
 373         /*
 374          * handle word aligned part
 375          */
 376         while (cnt >= 4) {
 377                 data = 0;
 378                 for (i=0; i<4; ++i) {
 379                         data = (data << 8) | *src++;
 380                 }
 381                 if ((rc = write_word(info, wp, data)) != 0) {
 382                         return (rc);
 383                 }
 384                 wp  += 4;
 385                 cnt -= 4;
 386         }
 387
 388         if (cnt == 0) {
 389                 return (0);
 390         }
 391
 392         /*
 393          * handle unaligned tail bytes
 394          */
 395         data = 0;
 396         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 397                 data = (data << 8) | *src++;
 398                 --cnt;
 399         }
 400         for (; i<4; ++i, ++cp) {
 401                 data = (data << 8) | (*(uchar *)cp);
 402         }
 403
 404         return (write_word(info, wp, data));
 405 }
 406
 407 /*-----------------------------------------------------------------------
 408  * Write a word to Flash, returns:
 409  * 0 - OK
 410  * 1 - write timeout
 411  * 2 - Flash not erased
 412  */
 413 static int write_word (flash_info_t *info, ulong dest, ulong data)
 414 {
 415         vu_long *addr = (vu_long *)(info->start[0]);
 416         ulong start;
 417         int flag;
 418
 419         /* Check if Flash is (sufficiently) erased */
 420         if ((*((vu_long *)dest) & data) != data) {
 421                 return (2);
 422         }
 423         /* Disable interrupts which might cause a timeout here */
 424         flag = disable_interrupts();
 425
 426         addr[0xAAA] = 0xAAAAAAAA;
 427         addr[0x555] = 0x55555555;
 428         addr[0xAAA] = 0xA0A0A0A0;
 429
 430         *((vu_long *)dest) = data;
 431
 432         /* re-enable interrupts if necessary */
 433         if (flag)
 434                 enable_interrupts();
 435
 436         /* data polling for D7 */
 437         start = get_timer (0);
 438         while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
 439                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 440                         return (1);
 441                 }
 442         }
 443         return (0);
 444 }
 445
 446 /*-----------------------------------------------------------------------
 447  */