board/ixdp425/flash.c

   1 /*
   2  * (C) Copyright 2001
   3  * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
   4  *
   5  * (C) Copyright 2001
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <linux/byteorder/swab.h>
  29
  30
  31 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];    /* info for FLASH chips        */
  32
  33 /* Board support for 1 or 2 flash devices */
  34 #undef FLASH_PORT_WIDTH32
  35 #define FLASH_PORT_WIDTH16
  36
  37 #ifdef FLASH_PORT_WIDTH16
  38 #define FLASH_PORT_WIDTH        ushort
  39 #define FLASH_PORT_WIDTHV       vu_short
  40 #define SWAP(x)                 x
  41 #else
  42 #define FLASH_PORT_WIDTH        ulong
  43 #define FLASH_PORT_WIDTHV       vu_long
  44 #define SWAP(x)                 __swab32(x)
  45 #endif
  46
  47 #define FPW     FLASH_PORT_WIDTH
  48 #define FPWV    FLASH_PORT_WIDTHV
  49
  50 #define mb()    __asm__ __volatile__ ("" : : : "memory")
  51
  52 /*-----------------------------------------------------------------------
  53  * Functions
  54  */
  55 static ulong flash_get_size (FPW * addr, flash_info_t * info);
  56 static int write_data (flash_info_t * info, ulong dest, FPW data);
  57 static void flash_get_offsets (ulong base, flash_info_t * info);
  58 void inline spin_wheel (void);
  59
  60 /*-----------------------------------------------------------------------
  61  */
  62
  63 unsigned long flash_init (void)
  64 {
  65         int i;
  66         ulong size = 0;
  67
  68         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  69                 switch (i) {
  70                 case 0:
  71                         flash_get_size ((FPW *) PHYS_FLASH_1, &flash_info[i]);
  72                         flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
  73                         break;
  74                 default:
  75                         panic ("configured too many flash banks!\n");
  76                         break;
  77                 }
  78                 size += flash_info[i].size;
  79         }
  80
  81         /* Protect monitor and environment sectors
  82          */
  83         flash_protect (FLAG_PROTECT_SET,
  84                        CONFIG_SYS_FLASH_BASE,
  85                        CONFIG_SYS_FLASH_BASE + _bss_start - _armboot_start,
  86                        &flash_info[0]);
  87
  88         flash_protect (FLAG_PROTECT_SET,
  89                        CONFIG_ENV_ADDR,
  90                        CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);
  91
  92         return size;
  93 }
  94
  95 /*-----------------------------------------------------------------------
  96  */
  97 static void flash_get_offsets (ulong base, flash_info_t * info)
  98 {
  99         int i;
 100
 101         if (info->flash_id == FLASH_UNKNOWN) {
 102                 return;
 103         }
 104
 105         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
 106                 for (i = 0; i < info->sector_count; i++) {
 107                         info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
 108                         info->protect[i] = 0;
 109                 }
 110         }
 111 }
 112
 113 /*-----------------------------------------------------------------------
 114  */
 115 void flash_print_info (flash_info_t * info)
 116 {
 117         int i;
 118
 119         if (info->flash_id == FLASH_UNKNOWN) {
 120                 printf ("missing or unknown FLASH type\n");
 121                 return;
 122         }
 123
 124         switch (info->flash_id & FLASH_VENDMASK) {
 125         case FLASH_MAN_INTEL:
 126                 printf ("INTEL ");
 127                 break;
 128         default:
 129                 printf ("Unknown Vendor ");
 130                 break;
 131         }
 132
 133         switch (info->flash_id & FLASH_TYPEMASK) {
 134         case FLASH_28F128J3A:
 135                 printf ("28F128J3A\n");
 136                 break;
 137         default:
 138                 printf ("Unknown Chip Type\n");
 139                 break;
 140         }
 141
 142         printf ("  Size: %ld MB in %d Sectors\n",
 143                 info->size >> 20, info->sector_count);
 144
 145         printf ("  Sector Start Addresses:");
 146         for (i = 0; i < info->sector_count; ++i) {
 147                 if ((i % 5) == 0)
 148                         printf ("\n   ");
 149                 printf (" %08lX%s",
 150                         info->start[i], info->protect[i] ? " (RO)" : "     ");
 151         }
 152         printf ("\n");
 153         return;
 154 }
 155
 156 /*
 157  * The following code cannot be run from FLASH!
 158  */
 159 static ulong flash_get_size (FPW * addr, flash_info_t * info)
 160 {
 161         volatile FPW value;
 162
 163         /* Write auto select command: read Manufacturer ID */
 164         addr[0x5555] = (FPW) 0x00AA00AA;
 165         addr[0x2AAA] = (FPW) 0x00550055;
 166         addr[0x5555] = (FPW) 0x00900090;
 167
 168         mb ();
 169         value = addr[0];
 170
 171         switch (value) {
 172
 173         case (FPW) INTEL_MANUFACT:
 174                 info->flash_id = FLASH_MAN_INTEL;
 175                 break;
 176
 177         default:
 178                 info->flash_id = FLASH_UNKNOWN;
 179                 info->sector_count = 0;
 180                 info->size = 0;
 181                 addr[0] = (FPW) 0x00FF00FF;     /* restore read mode */
 182                 return (0);     /* no or unknown flash  */
 183         }
 184
 185         mb ();
 186         value = addr[1];        /* device ID            */
 187
 188         switch (value) {
 189
 190         case (FPW) INTEL_ID_28F128J3A:
 191                 info->flash_id += FLASH_28F128J3A;
 192                 info->sector_count = 128;
 193                 info->size = 0x02000000;
 194                 break;          /* => 16 MB     */
 195
 196         default:
 197                 info->flash_id = FLASH_UNKNOWN;
 198                 break;
 199         }
 200
 201         if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 202                 printf ("** ERROR: sector count %d > max (%d) **\n",
 203                         info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 204                 info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 205         }
 206
 207         addr[0] = (FPW) 0x00FF00FF;     /* restore read mode */
 208
 209         return (info->size);
 210 }
 211
 212
 213 /*-----------------------------------------------------------------------
 214  */
 215
 216 int flash_erase (flash_info_t * info, int s_first, int s_last)
 217 {
 218         int flag, prot, sect;
 219         ulong type;
 220         int rcode = 0;
 221
 222         if ((s_first < 0) || (s_first > s_last)) {
 223                 if (info->flash_id == FLASH_UNKNOWN) {
 224                         printf ("- missing\n");
 225                 } else {
 226                         printf ("- no sectors to erase\n");
 227                 }
 228                 return 1;
 229         }
 230
 231         type = (info->flash_id & FLASH_VENDMASK);
 232         if ((type != FLASH_MAN_INTEL)) {
 233                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 234                         info->flash_id);
 235                 return 1;
 236         }
 237
 238         prot = 0;
 239         for (sect = s_first; sect <= s_last; ++sect) {
 240                 if (info->protect[sect]) {
 241                         prot++;
 242                 }
 243         }
 244
 245         if (prot) {
 246                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 247         } else {
 248                 printf ("\n");
 249         }
 250
 251         /* Disable interrupts which might cause a timeout here */
 252         flag = disable_interrupts ();
 253
 254         /* Start erase on unprotected sectors */
 255         for (sect = s_first; sect <= s_last; sect++) {
 256                 if (info->protect[sect] == 0) { /* not protected */
 257                         FPWV *addr = (FPWV *) (info->start[sect]);
 258                         FPW status;
 259
 260                         printf ("Erasing sector %2d ... ", sect);
 261
 262                         /* arm simple, non interrupt dependent timer */
 263                         reset_timer_masked ();
 264
 265                         *addr = (FPW) 0x00500050;       /* clear status register */
 266                         *addr = (FPW) 0x00200020;       /* erase setup */
 267                         *addr = (FPW) 0x00D000D0;       /* erase confirm */
 268
 269                         while (((status =
 270                                  *addr) & (FPW) 0x00800080) !=
 271                                (FPW) 0x00800080) {
 272                                 if (get_timer_masked () >
 273                                     CONFIG_SYS_FLASH_ERASE_TOUT) {
 274                                         printf ("Timeout\n");
 275                                         *addr = (FPW) 0x00B000B0;       /* suspend erase         */
 276                                         *addr = (FPW) 0x00FF00FF;       /* reset to read mode */
 277                                         rcode = 1;
 278                                         break;
 279                                 }
 280                         }
 281
 282                         *addr = (FPW) 0x00500050;       /* clear status register cmd.   */
 283                         *addr = (FPW) 0x00FF00FF;       /* resest to read mode          */
 284
 285                         printf (" done\n");
 286                 }
 287         }
 288         return rcode;
 289 }
 290
 291 /*-----------------------------------------------------------------------
 292  * Copy memory to flash, returns:
 293  * 0 - OK
 294  * 1 - write timeout
 295  * 2 - Flash not erased
 296  * 4 - Flash not identified
 297  */
 298
 299 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 300 {
 301         ulong cp, wp;
 302         FPW data;
 303         int count, i, l, rc, port_width;
 304
 305         if (info->flash_id == FLASH_UNKNOWN) {
 306                 return 4;
 307         }
 308
 309 /* get lower word aligned address */
 310 #ifdef FLASH_PORT_WIDTH16
 311         wp = (addr & ~1);
 312         port_width = 2;
 313 #else
 314         wp = (addr & ~3);
 315         port_width = 4;
 316 #endif
 317
 318         /*
 319          * handle unaligned start bytes
 320          */
 321         if ((l = addr - wp) != 0) {
 322                 data = 0;
 323                 for (i = 0, cp = wp; i < l; ++i, ++cp) {
 324                         data = (data << 8) | (*(uchar *) cp);
 325                 }
 326                 for (; i < port_width && cnt > 0; ++i) {
 327                         data = (data << 8) | *src++;
 328                         --cnt;
 329                         ++cp;
 330                 }
 331                 for (; cnt == 0 && i < port_width; ++i, ++cp) {
 332                         data = (data << 8) | (*(uchar *) cp);
 333                 }
 334
 335                 if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 336                         return (rc);
 337                 }
 338                 wp += port_width;
 339         }
 340
 341         /*
 342          * handle word aligned part
 343          */
 344         count = 0;
 345         while (cnt >= port_width) {
 346                 data = 0;
 347                 for (i = 0; i < port_width; ++i) {
 348                         data = (data << 8) | *src++;
 349                 }
 350                 if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 351                         return (rc);
 352                 }
 353                 wp += port_width;
 354                 cnt -= port_width;
 355                 if (count++ > 0x800) {
 356                         spin_wheel ();
 357                         count = 0;
 358                 }
 359         }
 360
 361         if (cnt == 0) {
 362                 return (0);
 363         }
 364
 365         /*
 366          * handle unaligned tail bytes
 367          */
 368         data = 0;
 369         for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
 370                 data = (data << 8) | *src++;
 371                 --cnt;
 372         }
 373         for (; i < port_width; ++i, ++cp) {
 374                 data = (data << 8) | (*(uchar *) cp);
 375         }
 376
 377         return (write_data (info, wp, SWAP (data)));
 378 }
 379
 380 /*-----------------------------------------------------------------------
 381  * Write a word or halfword to Flash, returns:
 382  * 0 - OK
 383  * 1 - write timeout
 384  * 2 - Flash not erased
 385  */
 386 static int write_data (flash_info_t * info, ulong dest, FPW data)
 387 {
 388         FPWV *addr = (FPWV *) dest;
 389         ulong status;
 390         int flag;
 391
 392         /* Check if Flash is (sufficiently) erased */
 393         if ((*addr & data) != data) {
 394                 printf ("not erased at %08lx (%lx)\n", (ulong) addr,
 395                         (ulong) * addr);
 396                 return (2);
 397         }
 398         /* Disable interrupts which might cause a timeout here */
 399         flag = disable_interrupts ();
 400
 401         *addr = (FPW) 0x00400040;       /* write setup */
 402         *addr = data;
 403
 404         /* arm simple, non interrupt dependent timer */
 405         reset_timer_masked ();
 406
 407         /* wait while polling the status register */
 408         while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
 409                 if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
 410                         *addr = (FPW) 0x00FF00FF;       /* restore read mode */
 411                         return (1);
 412                 }
 413         }
 414
 415         *addr = (FPW) 0x00FF00FF;       /* restore read mode */
 416
 417         return (0);
 418 }
 419
 420 void inline spin_wheel (void)
 421 {
 422         static int p = 0;
 423         static char w[] = "\\/-";
 424
 425         printf ("\010%c", w[p]);
 426         (++p == 3) ? (p = 0) : 0;
 427 }