board/lart/flash.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26
  27 ulong myflush(void);
  28
  29
  30 #define FLASH_BANK_SIZE 0x800000
  31 #define MAIN_SECT_SIZE  0x20000
  32 #define PARAM_SECT_SIZE 0x4000
  33
  34 /* puzzle magic for lart
  35  * data_*_flash are def'd in flashasm.S
  36  */
  37
  38 extern u32 data_from_flash(u32);
  39 extern u32 data_to_flash(u32);
  40
  41 #define PUZZLE_FROM_FLASH(x)    data_from_flash((x))
  42 #define PUZZLE_TO_FLASH(x)      data_to_flash((x))
  43
  44 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS];
  45
  46
  47 #define CMD_READ_ARRAY          0x00FF00FF
  48 #define CMD_IDENTIFY            0x00900090
  49 #define CMD_ERASE_SETUP         0x00200020
  50 #define CMD_ERASE_CONFIRM       0x00D000D0
  51 #define CMD_PROGRAM             0x00400040
  52 #define CMD_RESUME              0x00D000D0
  53 #define CMD_SUSPEND             0x00B000B0
  54 #define CMD_STATUS_READ         0x00700070
  55 #define CMD_STATUS_RESET        0x00500050
  56
  57 #define BIT_BUSY                0x00800080
  58 #define BIT_ERASE_SUSPEND       0x00400040
  59 #define BIT_ERASE_ERROR         0x00200020
  60 #define BIT_PROGRAM_ERROR       0x00100010
  61 #define BIT_VPP_RANGE_ERROR     0x00080008
  62 #define BIT_PROGRAM_SUSPEND     0x00040004
  63 #define BIT_PROTECT_ERROR       0x00020002
  64 #define BIT_UNDEFINED           0x00010001
  65
  66 #define BIT_SEQUENCE_ERROR      0x00300030
  67 #define BIT_TIMEOUT             0x80000000
  68
  69 /*-----------------------------------------------------------------------
  70  */
  71
  72 ulong flash_init(void)
  73 {
  74     int i, j;
  75     ulong size = 0;
  76
  77     for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
  78     {
  79         ulong flashbase = 0;
  80         flash_info[i].flash_id =
  81           (INTEL_MANUFACT & FLASH_VENDMASK) |
  82           (INTEL_ID_28F160F3B & FLASH_TYPEMASK);
  83         flash_info[i].size = FLASH_BANK_SIZE;
  84         flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
  85         memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
  86         if (i == 0)
  87           flashbase = PHYS_FLASH_1;
  88         else
  89           panic("configured too many flash banks!\n");
  90         for (j = 0; j < flash_info[i].sector_count; j++)
  91         {
  92             if (j <= 7)
  93             {
  94                 flash_info[i].start[j] = flashbase + j * PARAM_SECT_SIZE;
  95             }
  96             else
  97             {
  98                 flash_info[i].start[j] = flashbase + (j - 7)*MAIN_SECT_SIZE;
  99             }
 100         }
 101         size += flash_info[i].size;
 102     }
 103
 104     /* Protect monitor and environment sectors
 105      */
 106     flash_protect(FLAG_PROTECT_SET,
 107                   CFG_FLASH_BASE,
 108                   CFG_FLASH_BASE + monitor_flash_len - 1,
 109                   &flash_info[0]);
 110
 111     flash_protect(FLAG_PROTECT_SET,
 112                   CFG_ENV_ADDR,
 113                   CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
 114                   &flash_info[0]);
 115
 116     return size;
 117 }
 118
 119 /*-----------------------------------------------------------------------
 120  */
 121 void flash_print_info  (flash_info_t *info)
 122 {
 123     int i;
 124
 125     switch (info->flash_id & FLASH_VENDMASK)
 126     {
 127     case (INTEL_MANUFACT & FLASH_VENDMASK):
 128         printf("Intel: ");
 129         break;
 130     default:
 131         printf("Unknown Vendor ");
 132         break;
 133     }
 134
 135     switch (info->flash_id & FLASH_TYPEMASK)
 136     {
 137     case (INTEL_ID_28F160F3B & FLASH_TYPEMASK):
 138         printf("2x 28F160F3B (16Mbit)\n");
 139         break;
 140     default:
 141         printf("Unknown Chip Type\n");
 142         goto Done;
 143         break;
 144     }
 145
 146     printf("  Size: %ld MB in %d Sectors\n",
 147            info->size >> 20, info->sector_count);
 148
 149     printf("  Sector Start Addresses:");
 150     for (i = 0; i < info->sector_count; i++)
 151     {
 152         if ((i % 5) == 0)
 153         {
 154             printf ("\n   ");
 155         }
 156         printf (" %08lX%s", info->start[i],
 157                 info->protect[i] ? " (RO)" : "     ");
 158     }
 159     printf ("\n");
 160
 161 Done:
 162     ;
 163 }
 164
 165 /*-----------------------------------------------------------------------
 166  */
 167
 168 int flash_error (ulong code)
 169 {
 170         /* Check bit patterns */
 171         /* SR.7=0 is busy, SR.7=1 is ready */
 172         /* all other flags indicate error on 1 */
 173         /* SR.0 is undefined */
 174         /* Timeout is our faked flag */
 175
 176         /* sequence is described in Intel 290644-005 document */
 177
 178         /* check Timeout */
 179         if (code & BIT_TIMEOUT)
 180         {
 181                 printf ("Timeout\n");
 182                 return ERR_TIMOUT;
 183         }
 184
 185         /* check Busy, SR.7 */
 186         if (~code & BIT_BUSY)
 187         {
 188                 printf ("Busy\n");
 189                 return ERR_PROG_ERROR;
 190         }
 191
 192         /* check Vpp low, SR.3 */
 193         if (code & BIT_VPP_RANGE_ERROR)
 194         {
 195                 printf ("Vpp range error\n");
 196                 return ERR_PROG_ERROR;
 197         }
 198
 199         /* check Device Protect Error, SR.1 */
 200         if (code & BIT_PROTECT_ERROR)
 201         {
 202                 printf ("Device protect error\n");
 203                 return ERR_PROG_ERROR;
 204         }
 205
 206         /* check Command Seq Error, SR.4 & SR.5 */
 207         if (code & BIT_SEQUENCE_ERROR)
 208         {
 209                 printf ("Command seqence error\n");
 210                 return ERR_PROG_ERROR;
 211         }
 212
 213         /* check Block Erase Error, SR.5 */
 214         if (code & BIT_ERASE_ERROR)
 215         {
 216                 printf ("Block erase error\n");
 217                 return ERR_PROG_ERROR;
 218         }
 219
 220         /* check Program Error, SR.4 */
 221         if (code & BIT_PROGRAM_ERROR)
 222         {
 223                 printf ("Program error\n");
 224                 return ERR_PROG_ERROR;
 225         }
 226
 227         /* check Block Erase Suspended, SR.6 */
 228         if (code & BIT_ERASE_SUSPEND)
 229         {
 230                 printf ("Block erase suspended\n");
 231                 return ERR_PROG_ERROR;
 232         }
 233
 234         /* check Program Suspended, SR.2 */
 235         if (code & BIT_PROGRAM_SUSPEND)
 236         {
 237                 printf ("Program suspended\n");
 238                 return ERR_PROG_ERROR;
 239         }
 240
 241         /* OK, no error */
 242         return ERR_OK;
 243 }
 244
 245 /*-----------------------------------------------------------------------
 246  */
 247
 248 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 249 {
 250     ulong result;
 251     int iflag, cflag, prot, sect;
 252     int rc = ERR_OK;
 253
 254     /* first look for protection bits */
 255
 256     if (info->flash_id == FLASH_UNKNOWN)
 257         return ERR_UNKNOWN_FLASH_TYPE;
 258
 259     if ((s_first < 0) || (s_first > s_last)) {
 260         return ERR_INVAL;
 261     }
 262
 263     if ((info->flash_id & FLASH_VENDMASK) !=
 264         (INTEL_MANUFACT & FLASH_VENDMASK)) {
 265         return ERR_UNKNOWN_FLASH_VENDOR;
 266     }
 267
 268     prot = 0;
 269     for (sect=s_first; sect<=s_last; ++sect) {
 270         if (info->protect[sect]) {
 271             prot++;
 272         }
 273     }
 274     if (prot)
 275         return ERR_PROTECTED;
 276
 277     /*
 278      * Disable interrupts which might cause a timeout
 279      * here. Remember that our exception vectors are
 280      * at address 0 in the flash, and we don't want a
 281      * (ticker) exception to happen while the flash
 282      * chip is in programming mode.
 283      */
 284     cflag = icache_status();
 285     icache_disable();
 286     iflag = disable_interrupts();
 287
 288     /* Start erase on unprotected sectors */
 289     for (sect = s_first; sect<=s_last && !ctrlc(); sect++)
 290     {
 291         printf("Erasing sector %2d ... ", sect);
 292
 293         /* arm simple, non interrupt dependent timer */
 294         reset_timer_masked();
 295
 296         if (info->protect[sect] == 0)
 297         {       /* not protected */
 298             vu_long *addr = (vu_long *)(info->start[sect]);
 299
 300             *addr = PUZZLE_TO_FLASH(CMD_STATUS_RESET);
 301             *addr = PUZZLE_TO_FLASH(CMD_ERASE_SETUP);
 302             *addr = PUZZLE_TO_FLASH(CMD_ERASE_CONFIRM);
 303
 304             /* wait until flash is ready */
 305             do
 306             {
 307                 /* check timeout */
 308                 if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
 309                 {
 310                     *addr = PUZZLE_TO_FLASH(CMD_SUSPEND);
 311                     result = BIT_TIMEOUT;
 312                     break;
 313                 }
 314
 315                 result = PUZZLE_FROM_FLASH(*addr);
 316             }  while (~result & BIT_BUSY);
 317
 318             *addr = PUZZLE_TO_FLASH(CMD_READ_ARRAY);
 319
 320             if ((rc = flash_error(result)) != ERR_OK)
 321                 goto outahere;
 322
 323             printf("ok.\n");
 324         }
 325         else /* it was protected */
 326         {
 327             printf("protected!\n");
 328         }
 329     }
 330
 331     if (ctrlc())
 332       printf("User Interrupt!\n");
 333
 334 outahere:
 335     /* allow flash to settle - wait 10 ms */
 336     udelay_masked(10000);
 337
 338     if (iflag)
 339       enable_interrupts();
 340
 341     if (cflag)
 342       icache_enable();
 343
 344     return rc;
 345 }
 346
 347 /*-----------------------------------------------------------------------
 348  * Copy memory to flash
 349  */
 350
 351 static int write_word (flash_info_t *info, ulong dest, ulong data)
 352 {
 353     vu_long *addr = (vu_long *)dest;
 354     ulong result;
 355     int rc = ERR_OK;
 356     int cflag, iflag;
 357
 358     /* Check if Flash is (sufficiently) erased
 359      */
 360     result = PUZZLE_FROM_FLASH(*addr);
 361     if ((result & data) != data)
 362         return ERR_NOT_ERASED;
 363
 364     /*
 365      * Disable interrupts which might cause a timeout
 366      * here. Remember that our exception vectors are
 367      * at address 0 in the flash, and we don't want a
 368      * (ticker) exception to happen while the flash
 369      * chip is in programming mode.
 370      */
 371     cflag = icache_status();
 372     icache_disable();
 373     iflag = disable_interrupts();
 374
 375     *addr = PUZZLE_TO_FLASH(CMD_STATUS_RESET);
 376     *addr = PUZZLE_TO_FLASH(CMD_PROGRAM);
 377     *addr = data;
 378
 379     /* arm simple, non interrupt dependent timer */
 380     reset_timer_masked();
 381
 382     /* wait until flash is ready */
 383     do
 384     {
 385         /* check timeout */
 386         if (get_timer_masked() > CFG_FLASH_ERASE_TOUT)
 387         {
 388             *addr = PUZZLE_TO_FLASH(CMD_SUSPEND);
 389             result = BIT_TIMEOUT;
 390             break;
 391         }
 392
 393         result = PUZZLE_FROM_FLASH(*addr);
 394     }  while (~result & BIT_BUSY);
 395
 396     *addr = PUZZLE_TO_FLASH(CMD_READ_ARRAY);
 397
 398     rc = flash_error(result);
 399
 400     if (iflag)
 401       enable_interrupts();
 402
 403     if (cflag)
 404       icache_enable();
 405
 406     return rc;
 407 }
 408
 409 /*-----------------------------------------------------------------------
 410  * Copy memory to flash.
 411  */
 412
 413 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 414 {
 415     ulong cp, wp, data;
 416     int l;
 417     int i, rc;
 418
 419     wp = (addr & ~3);   /* get lower word aligned address */
 420
 421     /*
 422      * handle unaligned start bytes
 423      */
 424     if ((l = addr - wp) != 0) {
 425         data = 0;
 426         for (i=0, cp=wp; i<l; ++i, ++cp) {
 427             data = (data >> 8) | (*(uchar *)cp << 24);
 428         }
 429         for (; i<4 && cnt>0; ++i) {
 430             data = (data >> 8) | (*src++ << 24);
 431             --cnt;
 432             ++cp;
 433         }
 434         for (; cnt==0 && i<4; ++i, ++cp) {
 435             data = (data >> 8) | (*(uchar *)cp << 24);
 436         }
 437
 438         if ((rc = write_word(info, wp, data)) != 0) {
 439             return (rc);
 440         }
 441         wp += 4;
 442     }
 443
 444     /*
 445      * handle word aligned part
 446      */
 447     while (cnt >= 4) {
 448         data = *((vu_long*)src);
 449         if ((rc = write_word(info, wp, data)) != 0) {
 450             return (rc);
 451         }
 452         src += 4;
 453         wp  += 4;
 454         cnt -= 4;
 455     }
 456
 457     if (cnt == 0) {
 458         return ERR_OK;
 459     }
 460
 461     /*
 462      * handle unaligned tail bytes
 463      */
 464     data = 0;
 465     for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 466         data = (data >> 8) | (*src++ << 24);
 467         --cnt;
 468     }
 469     for (; i<4; ++i, ++cp) {
 470         data = (data >> 8) | (*(uchar *)cp << 24);
 471     }
 472
 473     return write_word(info, wp, data);
 474 }