board/rbc823/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]; /* info for FLASH chips */
  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, &flash_info[0]);
  50
  51         /* Setup offsets */
  52         flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  53
  54 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  55         /* Monitor protection ON by default */
  56         flash_protect(FLAG_PROTECT_SET,
  57                       CONFIG_SYS_MONITOR_BASE,
  58                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  59                       &flash_info[0]);
  60 #endif
  61
  62         size_b1 = 0 ;
  63
  64         flash_info[1].flash_id = FLASH_UNKNOWN;
  65         flash_info[1].sector_count = -1;
  66
  67         flash_info[0].size = size_b0;
  68         flash_info[1].size = size_b1;
  69
  70         return (size_b0 + size_b1);
  71 }
  72
  73 /*-----------------------------------------------------------------------
  74  * Fix this to support variable sector sizes
  75 */
  76 static void flash_get_offsets (ulong base, flash_info_t *info)
  77 {
  78         int i;
  79
  80         /* set up sector start address table */
  81         if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
  82                 /* set sector offsets for bottom boot block type        */
  83                 for (i = 0; i < info->sector_count; i++)
  84                         info->start[i] = base + (i * 0x00010000);
  85         }
  86 }
  87
  88 /*-----------------------------------------------------------------------
  89  */
  90 void flash_print_info  (flash_info_t *info)
  91 {
  92         int i;
  93
  94         if (info->flash_id == FLASH_UNKNOWN)
  95         {
  96                 puts ("missing or unknown FLASH type\n");
  97                 return;
  98         }
  99
 100         switch (info->flash_id & FLASH_VENDMASK)
 101         {
 102                 case FLASH_MAN_AMD:     printf ("AMD ");                break;
 103                 case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 104                 case FLASH_MAN_BM:      printf ("BRIGHT MICRO ");       break;
 105                 default:                printf ("Unknown Vendor ");     break;
 106         }
 107
 108         switch (info->flash_id & FLASH_TYPEMASK)
 109         {
 110                 case FLASH_AM040:       printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
 111                         break;
 112                 case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 113                                         break;
 114                 case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 115                                         break;
 116                 case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 117                                         break;
 118                 case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 119                                         break;
 120                 case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 121                                         break;
 122                 case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 123                                         break;
 124                 case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 125                                         break;
 126                 case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 127                                         break;
 128                 default:                printf ("Unknown Chip Type\n");
 129                                         break;
 130         }
 131
 132         if (info->size >> 20) {
 133             printf ("  Size: %ld MB in %d Sectors\n",
 134                 info->size >> 20,
 135                 info->sector_count);
 136         } else {
 137             printf ("  Size: %ld KB in %d Sectors\n",
 138                 info->size >> 10,
 139                 info->sector_count);
 140         }
 141
 142         puts ("  Sector Start Addresses:");
 143
 144         for (i=0; i<info->sector_count; ++i)
 145         {
 146                 if ((i % 5) == 0)
 147                 {
 148                         puts ("\n   ");
 149                 }
 150
 151                 printf (" %08lX%s",
 152                         info->start[i],
 153                         info->protect[i] ? " (RO)" : "     ");
 154         }
 155
 156         putc ('\n');
 157         return;
 158 }
 159 /*-----------------------------------------------------------------------
 160  */
 161
 162 /*
 163  * The following code cannot be run from FLASH!
 164  */
 165
 166 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 167 {
 168         short i;
 169         volatile unsigned char *caddr;
 170         char value;
 171
 172         caddr = (volatile unsigned char *)addr ;
 173
 174         /* Write auto select command: read Manufacturer ID */
 175
 176 #if 0
 177         printf("Base address is: %08x\n", caddr);
 178 #endif
 179
 180         caddr[0x0555] = 0xAA;
 181         caddr[0x02AA] = 0x55;
 182         caddr[0x0555] = 0x90;
 183
 184         value = caddr[0];
 185
 186 #if 0
 187         printf("Manufact ID: %02x\n", value);
 188 #endif
 189         switch (value)
 190         {
 191                 case 0x01: /*AMD_MANUFACT*/
 192                         info->flash_id = FLASH_MAN_AMD;
 193                 break;
 194
 195                 case 0x04: /*FUJ_MANUFACT*/
 196                         info->flash_id = FLASH_MAN_FUJ;
 197                 break;
 198
 199                 default:
 200                         info->flash_id = FLASH_UNKNOWN;
 201                         info->sector_count = 0;
 202                         info->size = 0;
 203                         break;
 204         }
 205
 206         value = caddr[1];                       /* device ID            */
 207 #if 0
 208         printf("Device ID: %02x\n", value);
 209 #endif
 210         switch (value)
 211         {
 212                 case AMD_ID_LV040B:
 213                         info->flash_id += FLASH_AM040;
 214                         info->sector_count = 8;
 215                         info->size = 0x00080000;
 216                         break;                          /* => 512Kb             */
 217
 218                 default:
 219                         info->flash_id = FLASH_UNKNOWN;
 220                         return (0);                     /* => no or unknown flash */
 221
 222         }
 223
 224         flash_get_offsets ((ulong)addr, &flash_info[0]);
 225
 226         /* check for protected sectors */
 227         for (i = 0; i < info->sector_count; i++)
 228         {
 229                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 230                 /* D0 = 1 if protected */
 231                 caddr = (volatile unsigned char *)(info->start[i]);
 232                 info->protect[i] = caddr[2] & 1;
 233         }
 234
 235         /*
 236          * Prevent writes to uninitialized FLASH.
 237          */
 238         if (info->flash_id != FLASH_UNKNOWN)
 239         {
 240                 caddr = (volatile unsigned char *)info->start[0];
 241                 *caddr = 0xF0;  /* reset bank */
 242         }
 243
 244         return (info->size);
 245 }
 246
 247
 248 /*-----------------------------------------------------------------------
 249  */
 250
 251 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 252 {
 253         volatile unsigned char *addr = (volatile unsigned char *)(info->start[0]);
 254         int flag, prot, sect, l_sect;
 255         ulong start, now, last;
 256
 257         if ((s_first < 0) || (s_first > s_last)) {
 258                 if (info->flash_id == FLASH_UNKNOWN) {
 259                         printf ("- missing\n");
 260                 } else {
 261                         printf ("- no sectors to erase\n");
 262                 }
 263                 return 1;
 264         }
 265
 266         if ((info->flash_id == FLASH_UNKNOWN) ||
 267             (info->flash_id > FLASH_AMD_COMP)) {
 268                 printf ("Can't erase unknown flash type - aborted\n");
 269                 return 1;
 270         }
 271
 272         prot = 0;
 273         for (sect=s_first; sect<=s_last; ++sect) {
 274                 if (info->protect[sect]) {
 275                         prot++;
 276                 }
 277         }
 278
 279         if (prot) {
 280                 printf ("- Warning: %d protected sectors will not be erased!\n",
 281                         prot);
 282         } else {
 283                 printf ("\n");
 284         }
 285
 286         l_sect = -1;
 287
 288         /* Disable interrupts which might cause a timeout here */
 289         flag = disable_interrupts();
 290
 291         addr[0x0555] = 0xAA;
 292         addr[0x02AA] = 0x55;
 293         addr[0x0555] = 0x80;
 294         addr[0x0555] = 0xAA;
 295         addr[0x02AA] = 0x55;
 296
 297         /* Start erase on unprotected sectors */
 298         for (sect = s_first; sect<=s_last; sect++) {
 299                 if (info->protect[sect] == 0) { /* not protected */
 300                         addr = (volatile unsigned char *)(info->start[sect]);
 301                         addr[0] = 0x30;
 302                         l_sect = sect;
 303                 }
 304         }
 305
 306         /* re-enable interrupts if necessary */
 307         if (flag)
 308                 enable_interrupts();
 309
 310         /* wait at least 80us - let's wait 1 ms */
 311         udelay (1000);
 312
 313         /*
 314          * We wait for the last triggered sector
 315          */
 316         if (l_sect < 0)
 317                 goto DONE;
 318
 319         start = get_timer (0);
 320         last  = start;
 321         addr = (volatile unsigned char *)(info->start[l_sect]);
 322
 323         while ((addr[0] & 0xFF) != 0xFF)
 324         {
 325                 if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 326                         printf ("Timeout\n");
 327                         return 1;
 328                 }
 329                 /* show that we're waiting */
 330                 if ((now - last) > 1000) {      /* every second */
 331                         putc ('.');
 332                         last = now;
 333                 }
 334         }
 335
 336 DONE:
 337         /* reset to read mode */
 338         addr = (volatile unsigned char *)info->start[0];
 339
 340         addr[0] = 0xF0; /* reset bank */
 341
 342         printf (" done\n");
 343         return 0;
 344 }
 345
 346 /*-----------------------------------------------------------------------
 347  * Copy memory to flash, returns:
 348  * 0 - OK
 349  * 1 - write timeout
 350  * 2 - Flash not erased
 351  */
 352
 353 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 354 {
 355         ulong cp, wp, data;
 356         int i, l, rc;
 357
 358         wp = (addr & ~3);       /* get lower word aligned address */
 359
 360         /*
 361          * handle unaligned start bytes
 362          */
 363         if ((l = addr - wp) != 0) {
 364                 data = 0;
 365                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 366                         data = (data << 8) | (*(uchar *)cp);
 367                 }
 368                 for (; i<4 && cnt>0; ++i) {
 369                         data = (data << 8) | *src++;
 370                         --cnt;
 371                         ++cp;
 372                 }
 373                 for (; cnt==0 && i<4; ++i, ++cp) {
 374                         data = (data << 8) | (*(uchar *)cp);
 375                 }
 376
 377                 if ((rc = write_word(info, wp, data)) != 0) {
 378                         return (rc);
 379                 }
 380                 wp += 4;
 381         }
 382
 383         /*
 384          * handle word aligned part
 385          */
 386         while (cnt >= 4) {
 387                 data = 0;
 388                 for (i=0; i<4; ++i) {
 389                         data = (data << 8) | *src++;
 390                 }
 391                 if ((rc = write_word(info, wp, data)) != 0) {
 392                         return (rc);
 393                 }
 394                 wp  += 4;
 395                 cnt -= 4;
 396         }
 397
 398         if (cnt == 0) {
 399                 return (0);
 400         }
 401
 402         /*
 403          * handle unaligned tail bytes
 404          */
 405         data = 0;
 406         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 407                 data = (data << 8) | *src++;
 408                 --cnt;
 409         }
 410         for (; i<4; ++i, ++cp) {
 411                 data = (data << 8) | (*(uchar *)cp);
 412         }
 413
 414         return (write_word(info, wp, data));
 415 }
 416
 417 /*-----------------------------------------------------------------------
 418  * Write a word to Flash, returns:
 419  * 0 - OK
 420  * 1 - write timeout
 421  * 2 - Flash not erased
 422  */
 423 static int write_word (flash_info_t *info, ulong dest, ulong data)
 424 {
 425         volatile unsigned char *addr = (volatile unsigned char*)(info->start[0]),
 426                                 *cdest,*cdata;
 427         ulong start;
 428         int flag, count = 4 ;
 429
 430         cdest = (volatile unsigned char *)dest ;
 431         cdata = (volatile unsigned char *)&data ;
 432
 433         /* Check if Flash is (sufficiently) erased */
 434         if ((*((vu_long *)dest) & data) != data) {
 435                 return (2);
 436         }
 437
 438         while(count--)
 439         {
 440             /* Disable interrupts which might cause a timeout here */
 441             flag = disable_interrupts();
 442
 443             addr[0x0555] = 0xAA;
 444             addr[0x02AA] = 0x55;
 445             addr[0x0555] = 0xA0;
 446
 447             *cdest = *cdata;
 448
 449             /* re-enable interrupts if necessary */
 450             if (flag)
 451                 enable_interrupts();
 452
 453             /* data polling for D7 */
 454             start = get_timer (0);
 455             while ((*cdest ^ *cdata) & 0x80)
 456             {
 457                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 458                         return (1);
 459                 }
 460             }
 461
 462             cdata++ ;
 463             cdest++ ;
 464         }
 465         return (0);
 466 }
 467
 468 /*-----------------------------------------------------------------------
 469  */