board/genietv/flash.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   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 #include <common.h>
  25 #include <mpc8xx.h>
  26
  27 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  28
  29 /*-----------------------------------------------------------------------
  30  * Functions
  31  */
  32 static ulong flash_get_size(vu_long *addr, flash_info_t *info);
  33 static int write_word(flash_info_t *info, ulong dest, ulong data);
  34 static void flash_get_offsets(ulong base, flash_info_t *info);
  35
  36 /*-----------------------------------------------------------------------
  37  */
  38
  39 unsigned long flash_init(void)
  40 {
  41         unsigned long size_b0, size_b1;
  42         int i;
  43
  44         /* Init: no FLASHes known */
  45         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
  46                 flash_info[i].flash_id = FLASH_UNKNOWN;
  47
  48         /* Detect size */
  49         size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE,
  50                         &flash_info[0]);
  51
  52         /* Setup offsets */
  53         flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  54
  55 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  56         /* Monitor protection ON by default */
  57         flash_protect(FLAG_PROTECT_SET,
  58                       CONFIG_SYS_MONITOR_BASE,
  59                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  60                       &flash_info[0]);
  61 #endif
  62
  63         size_b1 = 0 ;
  64
  65         flash_info[1].flash_id = FLASH_UNKNOWN;
  66         flash_info[1].sector_count = -1;
  67
  68         flash_info[0].size = size_b0;
  69         flash_info[1].size = size_b1;
  70
  71         return size_b0 + size_b1;
  72 }
  73
  74 /*-----------------------------------------------------------------------
  75  * Fix this to support variable sector sizes
  76 */
  77 static void flash_get_offsets(ulong base, flash_info_t *info)
  78 {
  79         int i;
  80
  81         /* set up sector start address table */
  82         if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
  83                 /* set sector offsets for bottom boot block type        */
  84                 for (i = 0; i < info->sector_count; i++)
  85                         info->start[i] = base + (i * 0x00010000);
  86         }
  87 }
  88
  89 /*-----------------------------------------------------------------------
  90  */
  91 void flash_print_info(flash_info_t *info)
  92 {
  93         int i;
  94
  95         if (info->flash_id == FLASH_UNKNOWN) {
  96                 puts("missing or unknown FLASH type\n");
  97                 return;
  98         }
  99
 100         switch (info->flash_id & FLASH_VENDMASK) {
 101         case FLASH_MAN_AMD:
 102                 printf("AMD ");
 103                 break;
 104         case FLASH_MAN_FUJ:
 105                 printf("FUJITSU ");
 106                 break;
 107         case FLASH_MAN_BM:
 108                 printf("BRIGHT MICRO ");
 109                 break;
 110         default:
 111                 printf("Unknown Vendor ");
 112                 break;
 113         }
 114
 115         switch (info->flash_id & FLASH_TYPEMASK) {
 116         case FLASH_AM040:
 117                 printf("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
 118                 break;
 119         case FLASH_AM400B:
 120                 printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
 121                 break;
 122         case FLASH_AM400T:
 123                 printf("AM29LV400T (4 Mbit, top boot sector)\n");
 124                 break;
 125         case FLASH_AM800B:
 126                 printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
 127                 break;
 128         case FLASH_AM800T:
 129                 printf("AM29LV800T (8 Mbit, top boot sector)\n");
 130                 break;
 131         case FLASH_AM160B:
 132                 printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
 133                 break;
 134         case FLASH_AM160T:
 135                 printf("AM29LV160T (16 Mbit, top boot sector)\n");
 136                 break;
 137         case FLASH_AM320B:
 138                 printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
 139                 break;
 140         case FLASH_AM320T:
 141                 printf("AM29LV320T (32 Mbit, top boot sector)\n");
 142                 break;
 143         default:
 144                 printf("Unknown Chip Type\n");
 145                 break;
 146         }
 147
 148         if (info->size >> 20) {
 149                 printf("  Size: %ld MB in %d Sectors\n",
 150                         info->size >> 20,
 151                         info->sector_count);
 152         } else {
 153                 printf("  Size: %ld KB in %d Sectors\n",
 154                         info->size >> 10,
 155                         info->sector_count);
 156         }
 157
 158         puts("  Sector Start Addresses:");
 159
 160         for (i = 0; i < info->sector_count; ++i) {
 161                 if ((i % 5) == 0)
 162                         puts("\n   ");
 163
 164                 printf(" %08lX%s",
 165                         info->start[i],
 166                         info->protect[i] ? " (RO)" : "     ");
 167         }
 168
 169         putc('\n');
 170         return;
 171 }
 172 /*-----------------------------------------------------------------------
 173  */
 174
 175 /*
 176  * The following code cannot be run from FLASH!
 177  */
 178
 179 static ulong flash_get_size(vu_long *addr, flash_info_t *info)
 180 {
 181         short i;
 182         volatile unsigned char *caddr;
 183         char value;
 184
 185         caddr = (volatile unsigned char *)addr ;
 186
 187         /* Write auto select command: read Manufacturer ID */
 188
 189         debug("Base address is: %08x\n", caddr);
 190
 191         caddr[0x0555] = 0xAA;
 192         caddr[0x02AA] = 0x55;
 193         caddr[0x0555] = 0x90;
 194
 195         value = caddr[0];
 196
 197         debug("Manufact ID: %02x\n", value);
 198
 199         switch (value) {
 200         case 0x1: /* AMD_MANUFACT */
 201                 info->flash_id = FLASH_MAN_AMD;
 202                 break;
 203         case 0x4: /* FUJ_MANUFACT */
 204                 info->flash_id = FLASH_MAN_FUJ;
 205                 break;
 206         default:
 207                 info->flash_id = FLASH_UNKNOWN;
 208                 info->sector_count = 0;
 209                 info->size = 0;
 210                 break;
 211         }
 212
 213         value = caddr[1];                       /* device ID            */
 214
 215         debug("Device ID: %02x\n", value);
 216
 217         switch (value) {
 218         case AMD_ID_LV040B:
 219                 info->flash_id += FLASH_AM040;
 220                 info->sector_count = 8;
 221                 info->size = 0x00080000;
 222                 break;                          /* => 512Kb             */
 223
 224         default:
 225                 info->flash_id = FLASH_UNKNOWN;
 226                 return 0;                       /* => no or unknown flash */
 227         }
 228
 229         flash_get_offsets((ulong)addr, &flash_info[0]);
 230
 231         /* check for protected sectors */
 232         for (i = 0; i < info->sector_count; i++) {
 233                 /*
 234                  * read sector protection at sector address,
 235                  * (A7 .. A0) = 0x02
 236                  * D0 = 1 if protected
 237                  */
 238                 caddr = (volatile unsigned char *)(info->start[i]);
 239                 info->protect[i] = caddr[2] & 1;
 240         }
 241
 242         /*
 243          * Prevent writes to uninitialized FLASH.
 244          */
 245         if (info->flash_id != FLASH_UNKNOWN) {
 246                 caddr = (volatile unsigned char *)info->start[0];
 247                 *caddr = 0xF0;  /* reset bank */
 248         }
 249
 250         return info->size;
 251 }
 252
 253 int     flash_erase(flash_info_t *info, int s_first, int s_last)
 254 {
 255         volatile unsigned char *addr =
 256                 (volatile unsigned char *)(info->start[0]);
 257         int flag, prot, sect, l_sect;
 258         ulong start, now, last;
 259
 260         if ((s_first < 0) || (s_first > s_last)) {
 261                 if (info->flash_id == FLASH_UNKNOWN)
 262                         printf("- missing\n");
 263                 else
 264                         printf("- no sectors to erase\n");
 265
 266                 return 1;
 267         }
 268
 269         if ((info->flash_id == FLASH_UNKNOWN) ||
 270             (info->flash_id > FLASH_AMD_COMP)) {
 271                 printf("Can't erase unknown flash type - aborted\n");
 272                 return 1;
 273         }
 274
 275         prot = 0;
 276         for (sect = s_first; sect <= s_last; ++sect) {
 277                 if (info->protect[sect])
 278                         prot++;
 279         }
 280
 281         if (prot) {
 282                 printf("- Warning: %d protected sectors will not be erased!\n",
 283                         prot);
 284         } else {
 285                 printf("\n");
 286         }
 287
 288         l_sect = -1;
 289
 290         /* Disable interrupts which might cause a timeout here */
 291         flag = disable_interrupts();
 292
 293         addr[0x0555] = 0xAA;
 294         addr[0x02AA] = 0x55;
 295         addr[0x0555] = 0x80;
 296         addr[0x0555] = 0xAA;
 297         addr[0x02AA] = 0x55;
 298
 299         /* Start erase on unprotected sectors */
 300         for (sect = s_first; sect <= s_last; sect++) {
 301                 if (info->protect[sect] == 0) { /* not protected */
 302                         addr = (volatile unsigned char *)(info->start[sect]);
 303                         addr[0] = 0x30;
 304                         l_sect = sect;
 305                 }
 306         }
 307
 308         /* re-enable interrupts if necessary */
 309         if (flag)
 310                 enable_interrupts();
 311
 312         /* wait at least 80us - let's wait 1 ms */
 313         udelay(1000);
 314
 315         /*
 316          * We wait for the last triggered sector
 317          */
 318         if (l_sect < 0)
 319                 goto DONE;
 320
 321         start = get_timer(0);
 322         last  = start;
 323         addr = (volatile unsigned char *)(info->start[l_sect]);
 324
 325         while ((addr[0] & 0xFF) != 0xFF) {
 326
 327                 now = get_timer(start);
 328
 329                 if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
 330                         printf("Timeout\n");
 331                         return 1;
 332                 }
 333                 /* show that we're waiting */
 334                 if ((now - last) > 1000) {      /* every second */
 335                         putc('.');
 336                         last = now;
 337                 }
 338         }
 339
 340 DONE:
 341         /* reset to read mode */
 342         addr = (volatile unsigned char *)info->start[0];
 343
 344         addr[0] = 0xF0; /* reset bank */
 345
 346         printf(" done\n");
 347         return 0;
 348 }
 349
 350 /*-----------------------------------------------------------------------
 351  * Copy memory to flash, returns:
 352  * 0 - OK
 353  * 1 - write timeout
 354  * 2 - Flash not erased
 355  */
 356
 357 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 358 {
 359         ulong cp, wp, data;
 360         int i, l, rc;
 361
 362         wp = (addr & ~3);       /* get lower word aligned address */
 363
 364         /*
 365          * handle unaligned start bytes
 366          */
 367         l = addr - wp;
 368
 369         if (l != 0) {
 370                 data = 0;
 371                 for (i = 0, cp = wp; i < l; ++i, ++cp)
 372                         data = (data << 8) | (*(uchar *)cp);
 373
 374                 for (; i < 4 && cnt > 0; ++i) {
 375                         data = (data << 8) | *src++;
 376                         --cnt;
 377                         ++cp;
 378                 }
 379                 for (; cnt == 0 && i < 4; ++i, ++cp)
 380                         data = (data << 8) | (*(uchar *)cp);
 381
 382                 rc = write_word(info, wp, data);
 383
 384                 if (rc != 0)
 385                         return rc;
 386
 387                 wp += 4;
 388         }
 389
 390         /*
 391          * handle word aligned part
 392          */
 393         while (cnt >= 4) {
 394                 data = 0;
 395                 for (i = 0; i < 4; ++i)
 396                         data = (data << 8) | *src++;
 397
 398                 rc = write_word(info, wp, data);
 399
 400                 if (rc != 0)
 401                         return rc;
 402
 403                 wp  += 4;
 404                 cnt -= 4;
 405         }
 406
 407         if (cnt == 0)
 408                 return 0;
 409
 410         /*
 411          * handle unaligned tail bytes
 412          */
 413         data = 0;
 414         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 415                 data = (data << 8) | *src++;
 416                 --cnt;
 417         }
 418         for (; i < 4; ++i, ++cp)
 419                 data = (data << 8) | (*(uchar *)cp);
 420
 421         return write_word(info, wp, data);
 422 }
 423
 424 /*-----------------------------------------------------------------------
 425  * Write a word to Flash, returns:
 426  * 0 - OK
 427  * 1 - write timeout
 428  * 2 - Flash not erased
 429  */
 430 static int write_word(flash_info_t *info, ulong dest, ulong data)
 431 {
 432         volatile unsigned char *cdest, *cdata;
 433         volatile unsigned char *addr =
 434                 (volatile unsigned char *)(info->start[0]);
 435         ulong start;
 436         int flag, count = 4 ;
 437
 438         cdest = (volatile unsigned char *)dest ;
 439         cdata = (volatile unsigned char *)&data ;
 440
 441         /* Check if Flash is (sufficiently) erased */
 442         if ((*((vu_long *)dest) & data) != data)
 443                 return 2;
 444
 445         while (count--) {
 446
 447                 /* Disable interrupts which might cause a timeout here */
 448                 flag = disable_interrupts();
 449
 450                 addr[0x0555] = 0xAA;
 451                 addr[0x02AA] = 0x55;
 452                 addr[0x0555] = 0xA0;
 453
 454                 *cdest = *cdata;
 455
 456                 /* re-enable interrupts if necessary */
 457                 if (flag)
 458                         enable_interrupts();
 459
 460                 /* data polling for D7 */
 461                 start = get_timer(0);
 462                 while ((*cdest ^ *cdata) & 0x80) {
 463                         if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 464                                 return 1;
 465                 }
 466
 467                 cdata++ ;
 468                 cdest++ ;
 469         }
 470         return 0;
 471 }