qemu/roms/u-boot/board/cray/L1/flash.c

   1 /*
   2  * (C) Copyright 2000
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * Modified 4/5/2001
  10  * Wait for completion of each sector erase command issued
  11  * 4/5/2001
  12  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  13  */
  14
  15 /*
  16  * Modified July 20, 2001
  17  * Strip down to support ONLY the AMD29F032B.
  18  * Dave Updegraff - Cray, Inc. dave@cray.com
  19  */
  20
  21 #include <common.h>
  22 #include <asm/ppc4xx.h>
  23 #include <asm/processor.h>
  24
  25 /* The flash chip we use... */
  26 #define AMD_ID_F032B    0x41    /* 29F032B ID  32 Mbit,64 64Kx8 sectors */
  27 #define FLASH_AM320B    0x0009
  28
  29
  30 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
  31
  32 /*-----------------------------------------------------------------------
  33  * Functions
  34  */
  35 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  36 static int write_word (flash_info_t *info, ulong dest, ulong data);
  37 static void flash_get_offsets (ulong base, flash_info_t *info);
  38
  39 #define ADDR0           0x5555
  40 #define ADDR1           0x2aaa
  41 #define FLASH_WORD_SIZE unsigned char
  42
  43 /*-----------------------------------------------------------------------
  44  */
  45
  46 unsigned long flash_init (void)
  47 {
  48         unsigned long size_b0, size_b1;
  49         int i;
  50
  51         /* Init: no FLASHes known */
  52         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
  53                 flash_info[i].flash_id = FLASH_UNKNOWN;
  54         }
  55
  56         /* Static FLASH Bank configuration here - FIXME XXX */
  57
  58         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  59
  60         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  61                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  62                         size_b0, size_b0<<20);
  63         }
  64
  65         /* Only one bank */
  66         if (CONFIG_SYS_MAX_FLASH_BANKS == 1)
  67           {
  68             /* Setup offsets */
  69             flash_get_offsets (FLASH_BASE0_PRELIM, &flash_info[0]);
  70
  71 #if 0
  72             /* Monitor protection ON by default */
  73             (void)flash_protect(FLAG_PROTECT_SET,
  74                                 FLASH_BASE0_PRELIM,
  75                                 FLASH_BASE0_PRELIM+monitor_flash_len-1,
  76                                 &flash_info[0]);
  77 #endif
  78             size_b1 = 0 ;
  79             flash_info[0].size = size_b0;
  80           }
  81
  82         return (size_b0 + size_b1);
  83 }
  84
  85
  86 /*-----------------------------------------------------------------------
  87  */
  88 static void flash_get_offsets (ulong base, flash_info_t *info)
  89 {
  90         int i;
  91
  92         /* set up sector start address table */
  93         for (i = 0; i < info->sector_count; i++)
  94                 info->start[i] = base + (i * 0x00010000);
  95 }
  96
  97 /*-----------------------------------------------------------------------
  98  */
  99 void flash_print_info  (flash_info_t *info)
 100 {
 101         int i;
 102         int k;
 103         int size;
 104         int erased;
 105         volatile unsigned long *flash;
 106
 107         if (info->flash_id == FLASH_UNKNOWN) {
 108                 printf ("missing or unknown FLASH type\n");
 109                 return;
 110         }
 111
 112         switch (info->flash_id & FLASH_VENDMASK) {
 113         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 114         default:                printf ("Unknown Vendor ");     break;
 115         }
 116
 117         switch (info->flash_id & FLASH_TYPEMASK) {
 118         case FLASH_AM320B:printf ("AM29F032B (32 Mbit 64x64KB uniform sectors)\n");
 119                                 break;
 120         default:                printf ("Unknown Chip Type\n");
 121                                 break;
 122         }
 123
 124         printf ("  Size: %ld KB in %d Sectors\n",
 125                 info->size >> 10, info->sector_count);
 126
 127         printf ("  Sector Start Addresses:");
 128         for (i=0; i<info->sector_count; ++i) {
 129                 /*
 130                  * Check if whole sector is erased
 131                  */
 132                 if (i != (info->sector_count-1))
 133                   size = info->start[i+1] - info->start[i];
 134                 else
 135                   size = info->start[0] + info->size - info->start[i];
 136                 erased = 1;
 137                 flash = (volatile unsigned long *)info->start[i];
 138                 size = size >> 2;        /* divide by 4 for longword access */
 139                 for (k=0; k<size; k++)
 140                   {
 141                     if (*flash++ != 0xffffffff)
 142                       {
 143                         erased = 0;
 144                         break;
 145                       }
 146                   }
 147
 148                 if ((i % 5) == 0)
 149                         printf ("\n   ");
 150
 151                 printf (" %08lX%s%s",
 152                         info->start[i],
 153                         erased ? " E" : "  ",
 154                         info->protect[i] ? "RO " : "   "
 155                 );
 156         }
 157         printf ("\n");
 158 }
 159
 160 /*-----------------------------------------------------------------------
 161  */
 162
 163
 164 /*-----------------------------------------------------------------------
 165  */
 166
 167 /*
 168  * The following code cannot be run from FLASH!
 169  */
 170 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 171 {
 172         short i;
 173         FLASH_WORD_SIZE value;
 174         ulong base = (ulong)addr;
 175         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
 176
 177         /* Write auto select command: read Manufacturer ID */
 178         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 179         addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 180         addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
 181
 182         value = addr2[0];
 183
 184         switch (value) {
 185         case (FLASH_WORD_SIZE)AMD_MANUFACT:
 186                 info->flash_id = FLASH_MAN_AMD;
 187                 break;
 188         default:
 189                 info->flash_id = FLASH_UNKNOWN;
 190                 info->sector_count = 0;
 191                 info->size = 0;
 192                 return (0);                     /* no or unknown flash  */
 193         }
 194
 195         value = addr2[1];                       /* device ID            */
 196
 197         switch (value) {
 198         case (FLASH_WORD_SIZE)AMD_ID_F032B:
 199                 info->flash_id += FLASH_AM320B;
 200                 info->sector_count = 64;
 201                 info->size = 0x0400000; /* => 4 MB */
 202                 break;
 203         default:
 204                 info->flash_id = FLASH_UNKNOWN;
 205                 return (0);                     /* => no or unknown flash */
 206
 207         }
 208
 209         /* set up sector start address table */
 210         for (i = 0; i < info->sector_count; i++)
 211                 info->start[i] = base + (i * 0x00010000);
 212
 213         /* check for protected sectors */
 214         for (i = 0; i < info->sector_count; i++) {
 215                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 216                 /* D0 = 1 if protected */
 217                 addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 218         info->protect[i] = addr2[2] & 1;
 219         }
 220
 221         /*
 222          * Prevent writes to uninitialized FLASH.
 223          */
 224         if (info->flash_id != FLASH_UNKNOWN) {
 225                 addr2 = (FLASH_WORD_SIZE *)info->start[0];
 226                 *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
 227         }
 228
 229         return (info->size);
 230 }
 231
 232 int wait_for_DQ7(flash_info_t *info, int sect)
 233 {
 234         ulong start, now, last;
 235         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);
 236
 237         start = get_timer (0);
 238     last  = start;
 239     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 240         if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 241             printf ("Timeout\n");
 242             return -1;
 243         }
 244         /* show that we're waiting */
 245         if ((now - last) > 1000) {  /* every second */
 246             putc ('.');
 247             last = now;
 248         }
 249     }
 250         return 0;
 251 }
 252
 253 /*-----------------------------------------------------------------------
 254  */
 255
 256 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 257 {
 258         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 259         volatile FLASH_WORD_SIZE *addr2;
 260         int flag, prot, sect;
 261
 262         if ((s_first < 0) || (s_first > s_last)) {
 263                 if (info->flash_id == FLASH_UNKNOWN) {
 264                         printf ("- missing\n");
 265                 } else {
 266                         printf ("- no sectors to erase\n");
 267                 }
 268                 return 1;
 269         }
 270
 271         if (info->flash_id == FLASH_UNKNOWN) {
 272                 printf ("Can't erase unknown flash type - aborted\n");
 273                 return 1;
 274         }
 275
 276         prot = 0;
 277         for (sect=s_first; sect<=s_last; ++sect) {
 278                 if (info->protect[sect]) {
 279                         prot++;
 280                 }
 281         }
 282
 283         if (prot) {
 284                 printf ("- Warning: %d protected sectors will not be erased!\n",
 285                         prot);
 286         } else {
 287                 printf ("\n");
 288         }
 289
 290         /* Disable interrupts which might cause a timeout here */
 291         flag = disable_interrupts();
 292
 293         /* Start erase on unprotected sectors */
 294         for (sect = s_first; sect<=s_last; sect++) {
 295                 if (info->protect[sect] == 0) { /* not protected */
 296                         addr2 = (FLASH_WORD_SIZE *)(info->start[sect]);
 297                         printf("Erasing sector %p\n", addr2);
 298
 299                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 300                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 301                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 302                         addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 303                         addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 304                         addr2[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 305                         /*
 306                          * Wait for each sector to complete, it's more
 307                          * reliable.  According to AMD Spec, you must
 308                          * issue all erase commands within a specified
 309                          * timeout.  This has been seen to fail, especially
 310                          * if printf()s are included (for debug)!!
 311                          */
 312                         wait_for_DQ7(info, sect);
 313                 }
 314         }
 315
 316         /* re-enable interrupts if necessary */
 317         if (flag)
 318                 enable_interrupts();
 319
 320         /* wait at least 80us - let's wait 1 ms */
 321         udelay (1000);
 322
 323         /* reset to read mode */
 324         addr = (FLASH_WORD_SIZE *)info->start[0];
 325         addr[0] = (FLASH_WORD_SIZE)0x00F000F0;  /* reset bank */
 326
 327         printf (" done\n");
 328         return 0;
 329 }
 330
 331 /*-----------------------------------------------------------------------
 332  * Copy memory to flash, returns:
 333  * 0 - OK
 334  * 1 - write timeout
 335  * 2 - Flash not erased
 336  */
 337
 338 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 339 {
 340         ulong cp, wp, data;
 341         int i, l, rc;
 342
 343         wp = (addr & ~3);       /* get lower word aligned address */
 344
 345         /*
 346          * handle unaligned start bytes
 347          */
 348         if ((l = addr - wp) != 0) {
 349                 data = 0;
 350                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 351                         data = (data << 8) | (*(uchar *)cp);
 352                 }
 353                 for (; i<4 && cnt>0; ++i) {
 354                         data = (data << 8) | *src++;
 355                         --cnt;
 356                         ++cp;
 357                 }
 358                 for (; cnt==0 && i<4; ++i, ++cp) {
 359                         data = (data << 8) | (*(uchar *)cp);
 360                 }
 361
 362                 if ((rc = write_word(info, wp, data)) != 0) {
 363                         return (rc);
 364                 }
 365                 wp += 4;
 366         }
 367
 368         /*
 369          * handle word aligned part
 370          */
 371         while (cnt >= 4) {
 372                 data = 0;
 373                 for (i=0; i<4; ++i) {
 374                         data = (data << 8) | *src++;
 375                 }
 376                 if ((rc = write_word(info, wp, data)) != 0) {
 377                         return (rc);
 378                 }
 379                 wp  += 4;
 380                 cnt -= 4;
 381         }
 382
 383         if (cnt == 0) {
 384                 return (0);
 385         }
 386
 387         /*
 388          * handle unaligned tail bytes
 389          */
 390         data = 0;
 391         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 392                 data = (data << 8) | *src++;
 393                 --cnt;
 394         }
 395         for (; i<4; ++i, ++cp) {
 396                 data = (data << 8) | (*(uchar *)cp);
 397         }
 398
 399         return (write_word(info, wp, data));
 400 }
 401
 402 /*-----------------------------------------------------------------------
 403  * Write a word to Flash, returns:
 404  * 0 - OK
 405  * 1 - write timeout
 406  * 2 - Flash not erased
 407  */
 408 static int write_word (flash_info_t *info, ulong dest, ulong data)
 409 {
 410         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)(info->start[0]);
 411         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *)dest;
 412         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
 413         ulong start;
 414         int flag;
 415         int i;
 416
 417         /* Check if Flash is (sufficiently) erased */
 418         if ((*((volatile FLASH_WORD_SIZE *)dest) &
 419              (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
 420                 return (2);
 421         }
 422         /* Disable interrupts which might cause a timeout here */
 423         flag = disable_interrupts();
 424
 425         for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
 426           {
 427             addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 428             addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 429             addr2[ADDR0] = (FLASH_WORD_SIZE)0x00A000A0;
 430
 431             dest2[i] = data2[i];
 432
 433             /* re-enable interrupts if necessary */
 434             if (flag)
 435               enable_interrupts();
 436
 437             /* data polling for D7 */
 438             start = get_timer (0);
 439             while ((dest2[i] & (FLASH_WORD_SIZE)0x00800080) !=
 440                    (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
 441               if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 442                 return (1);
 443               }
 444             }
 445           }
 446
 447         return (0);
 448 }
 449
 450 /*-----------------------------------------------------------------------
 451  */