git.sur5r.net Git - u-boot/blob - 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];
  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 unsigned long flash_init(void)
  37 {
  38         unsigned long size_b0;
  39         int i;
  40
  41         /* Init: no FLASHes known */
  42         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
  43                 flash_info[i].flash_id = FLASH_UNKNOWN;
  44
  45         /* Detect size */
  46         size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE,
  47                         &flash_info[0]);
  48
  49         /* Setup offsets */
  50         flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  51
  52 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  53         /* Monitor protection ON by default */
  54         flash_protect(FLAG_PROTECT_SET,
  55                       CONFIG_SYS_MONITOR_BASE,
  56                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  57                       &flash_info[0]);
  58 #endif
  59
  60         flash_info[0].size = size_b0;
  61
  62         return size_b0;
  63 }
  64
  65 /*-----------------------------------------------------------------------
  66  * Fix this to support variable sector sizes
  67 */
  68 static void flash_get_offsets(ulong base, flash_info_t *info)
  69 {
  70         int i;
  71
  72         /* set up sector start address table */
  73         if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
  74                 /* set sector offsets for bottom boot block type        */
  75                 for (i = 0; i < info->sector_count; i++)
  76                         info->start[i] = base + (i * 0x00010000);
  77         }
  78 }
  79
  80 /*-----------------------------------------------------------------------
  81  */
  82 void flash_print_info(flash_info_t *info)
  83 {
  84         int i;
  85
  86         if (info->flash_id == FLASH_UNKNOWN) {
  87                 puts("missing or unknown FLASH type\n");
  88                 return;
  89         }
  90
  91         switch (info->flash_id & FLASH_VENDMASK) {
  92         case FLASH_MAN_AMD:
  93                 printf("AMD ");
  94                 break;
  95         case FLASH_MAN_FUJ:
  96                 printf("FUJITSU ");
  97                 break;
  98         case FLASH_MAN_BM:
  99                 printf("BRIGHT MICRO ");
 100                 break;
 101         default:
 102                 printf("Unknown Vendor ");
 103                 break;
 104         }
 105
 106         switch (info->flash_id & FLASH_TYPEMASK) {
 107         case FLASH_AM040:
 108                 printf("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
 109                 break;
 110         case FLASH_AM400B:
 111                 printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
 112                 break;
 113         case FLASH_AM400T:
 114                 printf("AM29LV400T (4 Mbit, top boot sector)\n");
 115                 break;
 116         case FLASH_AM800B:
 117                 printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
 118                 break;
 119         case FLASH_AM800T:
 120                 printf("AM29LV800T (8 Mbit, top boot sector)\n");
 121                 break;
 122         case FLASH_AM160B:
 123                 printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
 124                 break;
 125         case FLASH_AM160T:
 126                 printf("AM29LV160T (16 Mbit, top boot sector)\n");
 127                 break;
 128         case FLASH_AM320B:
 129                 printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
 130                 break;
 131         case FLASH_AM320T:
 132                 printf("AM29LV320T (32 Mbit, top boot sector)\n");
 133                 break;
 134         default:
 135                 printf("Unknown Chip Type\n");
 136                 break;
 137         }
 138
 139         if (info->size >> 20) {
 140                 printf("  Size: %ld MB in %d Sectors\n",
 141                         info->size >> 20,
 142                         info->sector_count);
 143         } else {
 144                 printf("  Size: %ld KB in %d Sectors\n",
 145                         info->size >> 10,
 146                         info->sector_count);
 147         }
 148
 149         puts("  Sector Start Addresses:");
 150
 151         for (i = 0; i < info->sector_count; ++i) {
 152                 if ((i % 5) == 0)
 153                         puts("\n   ");
 154
 155                 printf(" %08lX%s",
 156                         info->start[i],
 157                         info->protect[i] ? " (RO)" : "     ");
 158         }
 159
 160         putc('\n');
 161         return;
 162 }
 163
 164 /*
 165  * The following code cannot be run from FLASH!
 166  */
 167
 168 static ulong flash_get_size(vu_long *addr, flash_info_t *info)
 169 {
 170         short i;
 171         volatile unsigned char *caddr;
 172         char value;
 173
 174         caddr = (volatile unsigned char *)addr ;
 175
 176         /* Write auto select command: read Manufacturer ID */
 177
 178         debug("Base address is: %8p\n", caddr);
 179
 180         caddr[0x0555] = 0xAA;
 181         caddr[0x02AA] = 0x55;
 182         caddr[0x0555] = 0x90;
 183
 184         value = caddr[0];
 185
 186         debug("Manufact ID: %02x\n", value);
 187
 188         switch (value) {
 189         case 0x01:      /*AMD_MANUFACT*/
 190                 info->flash_id = FLASH_MAN_AMD;
 191                 break;
 192
 193         case 0x04:      /*FUJ_MANUFACT*/
 194                 info->flash_id = FLASH_MAN_FUJ;
 195                 break;
 196
 197         default:
 198                 info->flash_id = FLASH_UNKNOWN;
 199                 info->sector_count = 0;
 200                 info->size = 0;
 201                 break;
 202         }
 203
 204         value = caddr[1];                       /* device ID            */
 205
 206         debug("Device ID: %02x\n", value);
 207
 208         switch (value) {
 209         case AMD_ID_LV040B:
 210                 info->flash_id += FLASH_AM040;
 211                 info->sector_count = 8;
 212                 info->size = 0x00080000;
 213                 break;                          /* => 512Kb             */
 214
 215         default:
 216                 info->flash_id = FLASH_UNKNOWN;
 217                 return 0;                       /* => no or unknown flash */
 218         }
 219
 220         flash_get_offsets((ulong)addr, &flash_info[0]);
 221
 222         /* check for protected sectors */
 223         for (i = 0; i < info->sector_count; i++) {
 224                 /*
 225                  * read sector protection at sector address,
 226                  * (A7 .. A0) = 0x02
 227                  * D0 = 1 if protected
 228                  */
 229                 caddr = (volatile unsigned char *)(info->start[i]);
 230                 info->protect[i] = caddr[2] & 1;
 231         }
 232
 233         /*
 234          * Prevent writes to uninitialized FLASH.
 235          */
 236         if (info->flash_id != FLASH_UNKNOWN) {
 237                 caddr = (volatile unsigned char *)info->start[0];
 238                 *caddr = 0xF0;  /* reset bank */
 239         }
 240
 241         return info->size;
 242 }
 243
 244
 245 int     flash_erase(flash_info_t *info, int s_first, int s_last)
 246 {
 247         volatile unsigned char *addr =
 248                 (volatile unsigned char *)(info->start[0]);
 249         int flag, prot, sect, l_sect;
 250         ulong start, now, last;
 251
 252         if ((s_first < 0) || (s_first > s_last)) {
 253                 if (info->flash_id == FLASH_UNKNOWN)
 254                         printf("- missing\n");
 255                 else
 256                         printf("- no sectors to erase\n");
 257
 258                 return 1;
 259         }
 260
 261         if ((info->flash_id == FLASH_UNKNOWN) ||
 262             (info->flash_id > FLASH_AMD_COMP)) {
 263                 printf("Can't erase unknown flash type - aborted\n");
 264                 return 1;
 265         }
 266
 267         prot = 0;
 268         for (sect = s_first; sect <= s_last; ++sect) {
 269                 if (info->protect[sect])
 270                         prot++;
 271         }
 272
 273         if (prot) {
 274                 printf("- Warning: %d protected sectors will not be erased!\n",
 275                         prot);
 276         } else {
 277                 printf("\n");
 278         }
 279
 280         l_sect = -1;
 281
 282         /* Disable interrupts which might cause a timeout here */
 283         flag = disable_interrupts();
 284
 285         addr[0x0555] = 0xAA;
 286         addr[0x02AA] = 0x55;
 287         addr[0x0555] = 0x80;
 288         addr[0x0555] = 0xAA;
 289         addr[0x02AA] = 0x55;
 290
 291         /* Start erase on unprotected sectors */
 292         for (sect = s_first; sect <= s_last; sect++) {
 293                 if (info->protect[sect] == 0) { /* not protected */
 294                         addr = (volatile unsigned char *)(info->start[sect]);
 295                         addr[0] = 0x30;
 296                         l_sect = sect;
 297                 }
 298         }
 299
 300         /* re-enable interrupts if necessary */
 301         if (flag)
 302                 enable_interrupts();
 303
 304         /* wait at least 80us - let's wait 1 ms */
 305         udelay(1000);
 306
 307         /*
 308          * We wait for the last triggered sector
 309          */
 310         if (l_sect < 0)
 311                 goto DONE;
 312
 313         start = get_timer(0);
 314         last  = start;
 315         addr = (volatile unsigned char *)(info->start[l_sect]);
 316
 317         while ((addr[0] & 0xFF) != 0xFF) {
 318                 now = get_timer(start);
 319                 if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
 320                         printf("Timeout\n");
 321                         return 1;
 322                 }
 323                 /* show that we're waiting */
 324                 if ((now - last) > 1000) {      /* every second */
 325                         putc('.');
 326                         last = now;
 327                 }
 328         }
 329
 330 DONE:
 331         /* reset to read mode */
 332         addr = (volatile unsigned char *)info->start[0];
 333
 334         addr[0] = 0xF0; /* reset bank */
 335
 336         printf(" done\n");
 337         return 0;
 338 }
 339
 340 /*
 341  * Copy memory to flash, returns:
 342  * 0 - OK
 343  * 1 - write timeout
 344  * 2 - Flash not erased
 345  */
 346
 347 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 348 {
 349         ulong cp, wp, data;
 350         int i, l, rc;
 351
 352         wp = (addr & ~3);       /* get lower word aligned address */
 353
 354         /*
 355          * handle unaligned start bytes
 356          */
 357         l = addr - wp;
 358
 359         if (l != 0) {
 360                 data = 0;
 361                 for (i = 0, cp = wp; i < l; ++i, ++cp)
 362                         data = (data << 8) | (*(uchar *)cp);
 363
 364                 for (; i < 4 && cnt > 0; ++i) {
 365                         data = (data << 8) | *src++;
 366                         --cnt;
 367                         ++cp;
 368                 }
 369
 370                 for (; cnt == 0 && i < 4; ++i, ++cp)
 371                         data = (data << 8) | (*(uchar *)cp);
 372
 373                 rc = write_word(info, wp, data);
 374
 375                 if (rc != 0)
 376                         return rc;
 377
 378                 wp += 4;
 379         }
 380
 381         /*
 382          * handle word aligned part
 383          */
 384         while (cnt >= 4) {
 385                 data = 0;
 386                 for (i = 0; i < 4; ++i)
 387                         data = (data << 8) | *src++;
 388
 389                 rc = write_word(info, wp, data);
 390
 391                 if (rc != 0)
 392                         return rc;
 393
 394                 wp  += 4;
 395                 cnt -= 4;
 396         }
 397
 398         if (cnt == 0)
 399                 return 0;
 400
 401         /*
 402          * handle unaligned tail bytes
 403          */
 404         data = 0;
 405         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 406                 data = (data << 8) | *src++;
 407                 --cnt;
 408         }
 409         for (; i < 4; ++i, ++cp)
 410                 data = (data << 8) | (*(uchar *)cp);
 411
 412         return write_word(info, wp, data);
 413 }
 414
 415 /*
 416  * Write a word to Flash, returns:
 417  * 0 - OK
 418  * 1 - write timeout
 419  * 2 - Flash not erased
 420  */
 421 static int write_word(flash_info_t *info, ulong dest, ulong data)
 422 {
 423         volatile unsigned char *cdest, *cdata;
 424         volatile unsigned char *addr =
 425                 (volatile unsigned char *)(info->start[0]);
 426         ulong start;
 427         int flag, count = 4 ;
 428
 429         cdest = (volatile unsigned char *)dest ;
 430         cdata = (volatile unsigned char *)&data ;
 431
 432         /* Check if Flash is (sufficiently) erased */
 433         if ((*((vu_long *)dest)&data) != data)
 434                 return 2;
 435
 436         while (count--) {
 437                 /* Disable interrupts which might cause a timeout here */
 438                 flag = disable_interrupts();
 439
 440                 addr[0x0555] = 0xAA;
 441                 addr[0x02AA] = 0x55;
 442                 addr[0x0555] = 0xA0;
 443
 444                 *cdest = *cdata;
 445
 446                 /* re-enable interrupts if necessary */
 447                 if (flag)
 448                         enable_interrupts();
 449
 450                 /* data polling for D7 */
 451                 start = get_timer(0);
 452                 while ((*cdest ^ *cdata) & 0x80) {
 453                         if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 454                                 return 1;
 455                 }
 456
 457                 cdata++ ;
 458                 cdest++ ;
 459         }
 460         return 0;
 461 }