board/gen860t/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  * Keith Outwater, keith_outwater@mvsi.com
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <mpc8xx.h>
  11
  12 #if defined(CONFIG_ENV_IS_IN_FLASH)
  13 # ifndef  CONFIG_ENV_ADDR
  14 #  define CONFIG_ENV_ADDR       (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  15 # endif
  16 # ifndef  CONFIG_ENV_SIZE
  17 #  define CONFIG_ENV_SIZE       CONFIG_ENV_SECT_SIZE
  18 # endif
  19 # ifndef  CONFIG_ENV_SECT_SIZE
  20 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
  21 # endif
  22 #endif
  23
  24 /*
  25  * Use buffered writes to flash by default - they are about 32x faster than
  26  * single byte writes.
  27  */
  28 #ifndef  CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
  29 #define CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
  30 #endif
  31
  32 /*
  33  * Max time to wait (in mS) for flash device to allocate a write buffer.
  34  */
  35 #ifndef CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT
  36 #define CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT              100
  37 #endif
  38
  39 /*
  40  * These functions support a single Intel StrataFlash device (28F128J3A)
  41  * in byte mode only!.  The flash routines are very basic and simple
  42  * since there isn't really any remapping necessary.
  43  */
  44
  45 /*
  46  * Intel SCS (Scalable Command Set) command definitions
  47  * (taken from 28F128J3A datasheet)
  48  */
  49 #define SCS_READ_CMD                            0xff
  50 #define SCS_READ_ID_CMD                         0x90
  51 #define SCS_QUERY_CMD                           0x98
  52 #define SCS_READ_STATUS_CMD                     0x70
  53 #define SCS_CLEAR_STATUS_CMD            0x50
  54 #define SCS_WRITE_BUF_CMD                       0xe8
  55 #define SCS_PROGRAM_CMD                         0x40
  56 #define SCS_BLOCK_ERASE_CMD                     0x20
  57 #define SCS_BLOCK_ERASE_RESUME_CMD      0xd0
  58 #define SCS_PROGRAM_RESUME_CMD          0xd0
  59 #define SCS_BLOCK_ERASE_SUSPEND_CMD     0xb0
  60 #define SCS_SET_BLOCK_LOCK_CMD          0x60
  61 #define SCS_CLR_BLOCK_LOCK_CMD          0x60
  62
  63 /*
  64  * SCS status/extended status register bit definitions
  65  */
  66 #define  SCS_SR7                                        0x80
  67 #define  SCS_XSR7                                       0x80
  68
  69 /*---------------------------------------------------------------------*/
  70 #if 0
  71 #define DEBUG_FLASH
  72 #endif
  73
  74 #ifdef DEBUG_FLASH
  75 #define PRINTF(fmt,args...) printf(fmt ,##args)
  76 #else
  77 #define PRINTF(fmt,args...)
  78 #endif
  79 /*---------------------------------------------------------------------*/
  80
  81 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  82
  83 /*-----------------------------------------------------------------------
  84  * Functions
  85  */
  86 static ulong flash_get_size (vu_char *addr, flash_info_t *info);
  87 static int write_data8 (flash_info_t *info, ulong dest, uchar data);
  88 static void flash_get_offsets (ulong base, flash_info_t *info);
  89
  90 /*-----------------------------------------------------------------------
  91  * Initialize the flash memory.
  92  */
  93 unsigned long
  94 flash_init (void)
  95 {
  96         volatile immap_t     *immap  = (immap_t *)CONFIG_SYS_IMMR;
  97         volatile memctl8xx_t *memctl = &immap->im_memctl;
  98         unsigned long size_b0;
  99         int i;
 100
 101         for (i= 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 102                 flash_info[i].flash_id = FLASH_UNKNOWN;
 103         }
 104
 105         /*
 106          * The gen860t board only has one FLASH memory device, so the
 107          * FLASH Bank configuration is done statically.
 108          */
 109         PRINTF("\n## Get flash bank 1 size @ 0x%08x\n", FLASH_BASE0_PRELIM);
 110         size_b0 = flash_get_size((vu_char *)FLASH_BASE0_PRELIM, &flash_info[0]);
 111         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 112                 printf ("## Unknown FLASH on Bank 0: "
 113                                 "ID 0x%lx, Size = 0x%08lx = %ld MB\n",
 114                                 flash_info[0].flash_id,size_b0, size_b0 << 20);
 115         }
 116
 117         PRINTF("## Before remap:\n"
 118                    "  BR0: 0x%08x    OR0: 0x%08x\n  BR1: 0x%08x    OR1: 0x%08x\n",
 119                    memctl->memc_br0, memctl->memc_or0,
 120                    memctl->memc_br1, memctl->memc_or1);
 121
 122         /*
 123          * Remap FLASH according to real size
 124          */
 125         memctl->memc_or0 |= (-size_b0 & 0xFFFF8000);
 126         memctl->memc_br0 |= (CONFIG_SYS_FLASH_BASE & BR_BA_MSK);
 127
 128         PRINTF("## After remap:\n"
 129                    "  BR0: 0x%08x    OR0: 0x%08x\n", memctl->memc_br0, memctl->memc_or0);
 130
 131         /*
 132          * Re-do sizing to get full correct info
 133          */
 134         size_b0 = flash_get_size ((vu_char *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
 135         flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
 136         flash_info[0].size = size_b0;
 137
 138 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 139         /*
 140          * Monitor protection is ON by default
 141          */
 142         flash_protect(FLAG_PROTECT_SET,
 143                           CONFIG_SYS_MONITOR_BASE,
 144                           CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 145                           &flash_info[0]);
 146 #endif
 147
 148 #ifdef  CONFIG_ENV_IS_IN_FLASH
 149         /*
 150          * Environment protection ON by default
 151          */
 152         flash_protect(FLAG_PROTECT_SET,
 153                           CONFIG_ENV_ADDR,
 154                           CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
 155                           &flash_info[0]);
 156 #endif
 157
 158         PRINTF("## Final Flash bank size: 0x%08lx\n",size_b0);
 159         return (size_b0);
 160 }
 161
 162
 163 /*-----------------------------------------------------------------------
 164  * Fill in the FLASH offset table
 165  */
 166 static void
 167 flash_get_offsets (ulong base, flash_info_t *info)
 168 {
 169         int i;
 170
 171         if (info->flash_id == FLASH_UNKNOWN) {
 172                 return;
 173         }
 174
 175         switch (info->flash_id & FLASH_VENDMASK) {
 176                 case FLASH_MAN_INTEL:
 177                 for (i = 0; i < info->sector_count; i++) {
 178                                 info->start[i] = base;
 179                                 base += 1024 * 128;
 180                 }
 181                 return;
 182
 183                 default:
 184                         printf ("Don't know sector offsets for FLASH"
 185                                 " type 0x%lx\n", info->flash_id);
 186             return;
 187         }
 188 }
 189
 190
 191 /*-----------------------------------------------------------------------
 192  * Display FLASH device info
 193  */
 194 void
 195 flash_print_info (flash_info_t *info)
 196 {
 197         int i;
 198
 199         if (info->flash_id == FLASH_UNKNOWN) {
 200                 printf ("Missing or unknown FLASH type\n");
 201                 return;
 202         }
 203
 204         switch (info->flash_id & FLASH_VENDMASK) {
 205         case FLASH_MAN_INTEL:
 206                         printf ("Intel ");
 207                         break;
 208         default:
 209                         printf ("Unknown Vendor ");
 210                         break;
 211         }
 212
 213         switch (info->flash_id & FLASH_TYPEMASK) {
 214         case FLASH_28F128J3A:
 215                         printf ("28F128J3A (128Mbit = 128K x 128)\n");
 216                         break;
 217         default:
 218                         printf ("Unknown Chip Type\n");
 219                         break;
 220         }
 221
 222         if (info->size >= (1024 * 1024)) {
 223                 i = 20;
 224         } else {
 225                 i = 10;
 226         }
 227         printf ("  Size: %ld %cB in %d Sectors\n",
 228                         info->size >> i,
 229                         (i == 20) ? 'M' : 'k',
 230                         info->sector_count);
 231
 232         printf ("  Sector Start Addresses:");
 233         for (i=0; i<info->sector_count; ++i) {
 234                 if ((i % 5) == 0)
 235                         printf ("\n   ");
 236                         printf (" %08lX%s",
 237                         info->start[i],
 238                         info->protect[i] ? " (RO)" : "     "
 239                 );
 240         }
 241         printf ("\n");
 242         return;
 243 }
 244
 245
 246 /*-----------------------------------------------------------------------
 247  * Get size and other information for a FLASH device.
 248  * NOTE: The following code cannot be run from FLASH!
 249  */
 250 static
 251 ulong flash_get_size (vu_char *addr, flash_info_t *info)
 252 {
 253 #define NO_FLASH        0
 254
 255         vu_char value[2];
 256
 257         /*
 258          * Try to read the manufacturer ID
 259          */
 260         addr[0] = SCS_READ_CMD;
 261         addr[0] = SCS_READ_ID_CMD;
 262         value[0] = addr[0];
 263         value[1] = addr[2];
 264         addr[0] = SCS_READ_CMD;
 265
 266         PRINTF("Manuf. ID @ 0x%08lx: 0x%02x\n", (ulong)addr, value[0]);
 267         switch (value[0]) {
 268                 case (INTEL_MANUFACT & 0xff):
 269                         info->flash_id = FLASH_MAN_INTEL;
 270                         break;
 271                 default:
 272                         info->flash_id = FLASH_UNKNOWN;
 273                         info->sector_count = 0;
 274                         info->size = 0;
 275                         return (NO_FLASH);
 276         }
 277
 278         /*
 279          * Read the device ID
 280          */
 281         PRINTF("Device ID @ 0x%08lx: 0x%02x\n", (ulong)(&addr[2]), value[1]);
 282         switch (value[1]) {
 283                 case (INTEL_ID_28F128J3A & 0xff):
 284                         info->flash_id += FLASH_28F128J3A;
 285                         info->sector_count = 128;
 286                         info->size = 16 * 1024 * 1024;
 287                         break;
 288
 289                 default:
 290                         info->flash_id = FLASH_UNKNOWN;
 291                         return (NO_FLASH);
 292         }
 293
 294         if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 295                 printf ("** ERROR: sector count %d > max (%d) **\n",
 296                                 info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 297                                 info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 298         }
 299         return (info->size);
 300 }
 301
 302
 303 /*-----------------------------------------------------------------------
 304  * Erase the specified sectors in the specified FLASH device
 305  */
 306 int
 307 flash_erase(flash_info_t *info, int s_first, int s_last)
 308 {
 309         int flag, prot, sect;
 310         ulong start, now, last;
 311
 312         if ((s_first < 0) || (s_first > s_last)) {
 313                 if (info->flash_id == FLASH_UNKNOWN) {
 314                         printf ("- missing\n");
 315                 } else {
 316                         printf ("- no sectors to erase\n");
 317                 }
 318                 return 1;
 319         }
 320
 321         if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
 322                 printf ("Can erase only Intel flash types - aborted\n");
 323                 return 1;
 324         }
 325
 326         prot = 0;
 327         for (sect=s_first; sect<=s_last; ++sect) {
 328                 if (info->protect[sect]) {
 329                         prot++;
 330                 }
 331         }
 332
 333         if (prot) {
 334                 printf ("- Warning: %d protected sectors will not be erased!\n",
 335                                 prot);
 336         } else {
 337                 printf ("\n");
 338         }
 339
 340         start = get_timer (0);
 341         last  = start;
 342
 343         /*
 344          * Start erase on unprotected sectors
 345          */
 346         for (sect = s_first; sect<=s_last; sect++) {
 347                 if (info->protect[sect] == 0) { /* not protected */
 348                         vu_char *addr = (uchar *)(info->start[sect]);
 349                         vu_char status;
 350
 351                         /*
 352                          * Disable interrupts which might cause a timeout
 353                          */
 354                         flag = disable_interrupts();
 355
 356                         *addr = SCS_CLEAR_STATUS_CMD;
 357                         *addr = SCS_BLOCK_ERASE_CMD;
 358                         *addr = SCS_BLOCK_ERASE_RESUME_CMD;
 359
 360                         /*
 361                          * Re-enable interrupts if necessary
 362                          */
 363                         if (flag)
 364                                 enable_interrupts();
 365
 366                         /*
 367                          * Wait at least 80us - let's wait 1 ms
 368                          */
 369                         udelay (1000);
 370
 371                         while (((status = *addr) & SCS_SR7) != SCS_SR7) {
 372                                 if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 373                                         printf ("Timeout\n");
 374                                         *addr = SCS_BLOCK_ERASE_SUSPEND_CMD;
 375                                         *addr = SCS_READ_CMD;
 376                                         return 1;
 377                                 }
 378
 379                                 /*
 380                                  * Show that we're waiting
 381                                  */
 382                                 if ((now - last) > 1000) {      /* 1 second */
 383                                         putc ('.');
 384                                         last = now;
 385                                 }
 386                         }
 387                         *addr = SCS_READ_CMD;
 388                 }
 389         }
 390         printf (" done\n");
 391         return 0;
 392 }
 393
 394
 395 #ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
 396 /*
 397  * Allocate a flash buffer, fill it with data and write it to the flash.
 398  * 0 - OK
 399  * 1 - Timeout on buffer request
 400  *
 401  * NOTE: After the last call to this function, WSM status needs to be checked!
 402  */
 403 static int
 404 write_flash_buffer8(flash_info_t *info_p, vu_char *src_p, vu_char *dest_p,
 405                                     uint count)
 406 {
 407         vu_char *block_addr_p = NULL;
 408         vu_char *start_addr_p = NULL;
 409         ulong blocksize = info_p->size / (ulong)info_p->sector_count;
 410
 411         int i;
 412         uint time = get_timer(0);
 413
 414         PRINTF("%s:%d: src: 0x%p dest: 0x%p  count: %d\n",
 415                    __FUNCTION__, __LINE__, src_p, dest_p, count);
 416
 417         /*
 418          * What block are we in? We already know that the source address is
 419          * in the flash address range, but we also can't cross a block boundary.
 420          * We assume that the block does not cross a boundary (we'll check before
 421          * calling this function).
 422          */
 423         for (i = 0; i < info_p->sector_count; ++i) {
 424                 if ( ((ulong)dest_p >= info_p->start[i]) &&
 425                     ((ulong)dest_p < (info_p->start[i] + blocksize)) ) {
 426                         PRINTF("%s:%d: Dest addr 0x%p is in block %d @ 0x%.8lx\n",
 427                                    __FUNCTION__, __LINE__, dest_p, i, info_p->start[i]);
 428                         block_addr_p = (vu_char *)info_p->start[i];
 429                         break;
 430                 }
 431         }
 432
 433         /*
 434          * Request a buffer
 435          */
 436         *block_addr_p = SCS_WRITE_BUF_CMD;
 437         while ((*block_addr_p & SCS_XSR7) != SCS_XSR7) {
 438                 if (get_timer(time) >  CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT) {
 439                         PRINTF("%s:%d: Buffer allocation timeout @ 0x%p (waited %d mS)\n",
 440                                    __FUNCTION__, __LINE__, block_addr_p,
 441                                    CONFIG_SYS_FLASH_ALLOC_BUFFER_TOUT);
 442                         return 1;
 443                 }
 444                 *block_addr_p = SCS_WRITE_BUF_CMD;
 445         }
 446
 447         /*
 448          * Fill the buffer with data
 449          */
 450         start_addr_p = dest_p;
 451         *block_addr_p = count - 1; /* flash device wants count - 1 */
 452         PRINTF("%s:%d: Fill buffer at block addr 0x%p\n",
 453                    __FUNCTION__, __LINE__, block_addr_p);
 454         for (i = 0; i < count; i++) {
 455                 *start_addr_p++ = *src_p++;
 456         }
 457
 458         /*
 459          * Flush buffer to flash
 460          */
 461         *block_addr_p = SCS_PROGRAM_RESUME_CMD;
 462 #if 1
 463         time = get_timer(0);
 464         while ((*block_addr_p & SCS_SR7) != SCS_SR7) {
 465                 if (get_timer(time) >  CONFIG_SYS_FLASH_WRITE_TOUT) {
 466                         PRINTF("%s:%d: Write timeout @ 0x%p (waited %d mS)\n",
 467                                    __FUNCTION__, __LINE__, block_addr_p, CONFIG_SYS_FLASH_WRITE_TOUT);
 468                         return 1;
 469                 }
 470         }
 471
 472 #endif
 473         return 0;
 474 }
 475 #endif
 476
 477
 478 /*-----------------------------------------------------------------------
 479  * Copy memory to flash, returns:
 480  * 0 - OK
 481  * 1 - write timeout
 482  * 2 - Flash not erased
 483  * 4 - Flash not identified
 484  */
 485 int
 486 write_buff(flash_info_t *info_p, uchar *src_p, ulong addr, ulong count)
 487 {
 488         int rc = 0;
 489 #ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
 490 #define FLASH_WRITE_BUF_SIZE    0x00000020      /* 32 bytes */
 491         int i;
 492         uint bufs;
 493         ulong buf_count;
 494         vu_char *sp;
 495         vu_char *dp;
 496 #else
 497         ulong wp;
 498 #endif
 499
 500         PRINTF("\n%s:%d: src: 0x%.8lx dest: 0x%.8lx size: %d (0x%.8lx)\n",
 501                    __FUNCTION__, __LINE__, (ulong)src_p, addr, (uint)count, count);
 502
 503         if (info_p->flash_id == FLASH_UNKNOWN) {
 504                 return 4;
 505         }
 506
 507 #ifdef CONFIG_SYS_GEN860T_FLASH_USE_WRITE_BUFFER
 508         sp = src_p;
 509         dp = (uchar *)addr;
 510
 511         /*
 512          * For maximum performance, we want to align the start address to
 513          * the beginning of a write buffer boundary (i.e. A4-A0 of the
 514          * start address = 0). See how many bytes are required to get to a
 515          * write-buffer-aligned address.  If that number is non-zero, do
 516          * non buffered writes of the non-aligned data.  By doing non-buffered
 517          * writes, we avoid the problem of crossing a block (sector) boundary
 518          * with buffered writes.
 519          */
 520         buf_count = FLASH_WRITE_BUF_SIZE - (addr & (FLASH_WRITE_BUF_SIZE - 1));
 521         if (buf_count == FLASH_WRITE_BUF_SIZE) { /* already on a boundary */
 522                 buf_count = 0;
 523         }
 524         if (buf_count > count) { /* not a full buffers worth of data to write */
 525                 buf_count = count;
 526         }
 527         count -= buf_count;
 528
 529         PRINTF("%s:%d: Write buffer alignment count = %ld\n",
 530                    __FUNCTION__, __LINE__, buf_count);
 531         while (buf_count-- >= 1) {
 532                 if ((rc = write_data8(info_p, (ulong)dp++, *sp++)) != 0)  {
 533                         return (rc);
 534                 }
 535         }
 536
 537         PRINTF("%s:%d: count = %ld\n", __FUNCTION__, __LINE__, count);
 538         if (count == 0) { /* all done */
 539                 PRINTF("%s:%d: Less than 1 buffer (%d) worth of bytes\n",
 540                            __FUNCTION__, __LINE__, FLASH_WRITE_BUF_SIZE);
 541                 return (rc);
 542         }
 543
 544         /*
 545          * Now that we are write buffer aligned, write full or partial buffers.
 546          * The fact that we are write buffer aligned automatically avoids
 547          * crossing a block address during a write buffer operation.
 548          */
 549         bufs = count / FLASH_WRITE_BUF_SIZE;
 550         PRINTF("%s:%d: %d (0x%x) buffers to write\n", __FUNCTION__, __LINE__,
 551                    bufs, bufs);
 552         while (bufs >= 1) {
 553                 rc = write_flash_buffer8(info_p, sp, dp, FLASH_WRITE_BUF_SIZE);
 554                 if (rc != 0) {
 555                         PRINTF("%s:%d: ** Error writing buf %d\n",
 556                                    __FUNCTION__, __LINE__, bufs);
 557                         return (rc);
 558                 }
 559                 bufs--;
 560                 sp += FLASH_WRITE_BUF_SIZE;
 561                 dp += FLASH_WRITE_BUF_SIZE;
 562         }
 563
 564         /*
 565          * Do the leftovers
 566          */
 567         i = count % FLASH_WRITE_BUF_SIZE;
 568         PRINTF("%s:%d: %d (0x%x) leftover bytes\n", __FUNCTION__, __LINE__, i, i);
 569         if (i > 0) {
 570                 rc = write_flash_buffer8(info_p, sp, dp, i);
 571         }
 572
 573         sp = (vu_char*)info_p->start[0];
 574         *sp = SCS_READ_CMD;
 575         return (rc);
 576
 577 #else
 578         wp = addr;
 579         while (count-- >= 1) {
 580                 if((rc = write_data8(info_p, wp++, *src_p++)) != 0)
 581                         return (rc);
 582         }
 583         return 0;
 584 #endif
 585 }
 586
 587
 588 /*-----------------------------------------------------------------------
 589  * Write a byte to Flash, returns:
 590  * 0 - OK
 591  * 1 - write timeout
 592  * 2 - Flash not erased
 593  */
 594 static int
 595 write_data8 (flash_info_t *info, ulong dest, uchar data)
 596 {
 597         vu_char *addr = (vu_char *)dest;
 598         vu_char status;
 599         ulong start;
 600         int flag;
 601
 602         /* Check if Flash is (sufficiently) erased */
 603         if ((*addr & data) != data) {
 604                 return (2);
 605         }
 606         /* Disable interrupts which might cause a timeout here */
 607         flag = disable_interrupts();
 608
 609         *addr = SCS_PROGRAM_CMD;
 610         *addr = data;
 611
 612         /* re-enable interrupts if necessary */
 613         if (flag)
 614                 enable_interrupts();
 615
 616         start = get_timer (0);
 617
 618         while (((status = *addr) & SCS_SR7) != SCS_SR7) {
 619                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 620                         *addr = SCS_READ_CMD;
 621                         return (1);
 622                 }
 623         }
 624         *addr = SCS_READ_CMD;
 625         return (0);
 626 }
 627
 628 /* vim: set ts=4 sw=4 tw=78: */