LXR uboot/board/hermes/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
  27flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
  28
  29/*-----------------------------------------------------------------------
  30 * Functions
  31 */
  32static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  33static int write_byte (flash_info_t *info, ulong dest, uchar data);
  34static void flash_get_offsets (ulong base, flash_info_t *info);
  35
  36/*-----------------------------------------------------------------------
  37 */
  38
  39unsigned long flash_init (void)
  40{
  41        volatile immap_t     *immap  = (immap_t *)CONFIG_SYS_IMMR;
  42        volatile memctl8xx_t *memctl = &immap->im_memctl;
  43        unsigned long size;
  44        int i;
  45
  46        /* Init: no FLASHes known */
  47        for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
  48                flash_info[i].flash_id = FLASH_UNKNOWN;
  49        }
  50
  51        /* Static FLASH Bank configuration here - FIXME XXX */
  52
  53        size = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  54
  55        if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  56                printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  57                        size, size<<20);
  58        }
  59
  60        /* Remap FLASH according to real size */
  61        memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH | (-size & 0xFFFF8000);
  62        memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) |
  63                                (memctl->memc_br0 & ~(BR_BA_MSK));
  64
  65        /* Re-do sizing to get full correct info */
  66        size = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  67
  68        flash_get_offsets (CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  69
  70#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  71        /* monitor protection ON by default */
  72        flash_protect(FLAG_PROTECT_SET,
  73                      CONFIG_SYS_MONITOR_BASE,
  74                      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  75                      &flash_info[0]);
  76#endif
  77
  78        flash_info[0].size = size;
  79
  80        return (size);
  81}
  82
  83/*-----------------------------------------------------------------------
  84 */
  85static void flash_get_offsets (ulong base, flash_info_t *info)
  86{
  87        int i;
  88
  89        /* set up sector start address table */
  90        if (info->flash_id & FLASH_BTYPE) {
  91                /* set sector offsets for bottom boot block type        */
  92                info->start[0] = base + 0x00000000;
  93                info->start[1] = base + 0x00004000;
  94                info->start[2] = base + 0x00006000;
  95                info->start[3] = base + 0x00008000;
  96                for (i = 4; i < info->sector_count; i++) {
  97                        info->start[i] = base + (i * 0x00010000) - 0x00030000;
  98                }
  99        } else {
 100                /* set sector offsets for top boot block type           */
 101                i = info->sector_count - 1;
 102                info->start[i--] = base + info->size - 0x00004000;
 103                info->start[i--] = base + info->size - 0x00006000;
 104                info->start[i--] = base + info->size - 0x00008000;
 105                for (; i >= 0; i--) {
 106                        info->start[i] = base + i * 0x00010000;
 107                }
 108        }
 109
 110}
 111
 112/*-----------------------------------------------------------------------
 113 */
 114void flash_print_info  (flash_info_t *info)
 115{
 116        int i;
 117
 118        if (info->flash_id == FLASH_UNKNOWN) {
 119                printf ("missing or unknown FLASH type\n");
 120                return;
 121        }
 122
 123        switch (info->flash_id & FLASH_VENDMASK) {
 124        case FLASH_MAN_AMD:     printf ("AMD ");                break;
 125        case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 126        default:                printf ("Unknown Vendor ");     break;
 127        }
 128
 129        switch (info->flash_id & FLASH_TYPEMASK) {
 130        case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 131                                break;
 132        case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 133                                break;
 134        case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 135                                break;
 136        case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 137                                break;
 138        case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 139                                break;
 140        case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 141                                break;
 142        case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 143                                break;
 144        case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 145                                break;
 146        default:                printf ("Unknown Chip Type\n");
 147                                break;
 148        }
 149
 150        printf ("  Size: %ld MB in %d Sectors\n",
 151                info->size >> 20, info->sector_count);
 152
 153        printf ("  Sector Start Addresses:");
 154        for (i=0; i<info->sector_count; ++i) {
 155                if ((i % 5) == 0)
 156                        printf ("\n   ");
 157                printf (" %08lX%s",
 158                        info->start[i],
 159                        info->protect[i] ? " (RO)" : "     "
 160                );
 161        }
 162        printf ("\n");
 163        return;
 164}
 165
 166/*-----------------------------------------------------------------------
 167 */
 168
 169
 170/*-----------------------------------------------------------------------
 171 */
 172
 173/*
 174 * The following code cannot be run from FLASH!
 175 */
 176
 177static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 178{
 179        short i;
 180        uchar value;
 181        vu_char *caddr = (vu_char *)addr;
 182        ulong base = (ulong)addr;
 183
 184
 185        /* Write auto select command: read Manufacturer ID */
 186        caddr[0x0AAA] = 0xAA;
 187        caddr[0x0555] = 0x55;
 188        caddr[0x0AAA] = 0x90;
 189
 190        value = caddr[0];
 191        switch (value) {
 192        case (AMD_MANUFACT & 0xFF):
 193                info->flash_id = FLASH_MAN_AMD;
 194                break;
 195        case (FUJ_MANUFACT & 0xFF):
 196                info->flash_id = FLASH_MAN_FUJ;
 197                break;
 198        default:
 199                info->flash_id = FLASH_UNKNOWN;
 200                info->sector_count = 0;
 201                info->size = 0;
 202                return (0);                     /* no or unknown flash  */
 203        }
 204
 205        value = caddr[2];                       /* device ID            */
 206
 207        switch (value) {
 208        case (AMD_ID_LV400T & 0xFF):
 209                info->flash_id += FLASH_AM400T;
 210                info->sector_count = 11;
 211                info->size = 0x00080000;
 212                break;                          /* => 512 kB            */
 213
 214        case (AMD_ID_LV400B & 0xFF):
 215                info->flash_id += FLASH_AM400B;
 216                info->sector_count = 11;
 217                info->size = 0x00080000;
 218                break;                          /* => 512 kB            */
 219
 220        case (AMD_ID_LV800T & 0xFF):
 221                info->flash_id += FLASH_AM800T;
 222                info->sector_count = 19;
 223                info->size = 0x00100000;
 224                break;                          /* => 1 MB              */
 225
 226        case (AMD_ID_LV800B & 0xFF):
 227                info->flash_id += FLASH_AM800B;
 228                info->sector_count = 19;
 229                info->size = 0x00100000;
 230                break;                          /* => 1 MB              */
 231
 232        case (AMD_ID_LV160T & 0xFF):
 233                info->flash_id += FLASH_AM160T;
 234                info->sector_count = 35;
 235                info->size = 0x00200000;
 236                break;                          /* => 2 MB              */
 237
 238        case (AMD_ID_LV160B & 0xFF):
 239                info->flash_id += FLASH_AM160B;
 240                info->sector_count = 35;
 241                info->size = 0x00200000;
 242                break;                          /* => 2 MB              */
 243#if 0   /* enable when device IDs are available */
 244        case (AMD_ID_LV320T & 0xFF):
 245                info->flash_id += FLASH_AM320T;
 246                info->sector_count = 67;
 247                info->size = 0x00400000;
 248                break;                          /* => 4 MB              */
 249
 250        case (AMD_ID_LV320B & 0xFF):
 251                info->flash_id += FLASH_AM320B;
 252                info->sector_count = 67;
 253                info->size = 0x00400000;
 254                break;                          /* => 4 MB              */
 255#endif
 256        default:
 257                info->flash_id = FLASH_UNKNOWN;
 258                return (0);                     /* => no or unknown flash */
 259
 260        }
 261
 262        /* set up sector start address table */
 263        if (info->flash_id & FLASH_BTYPE) {
 264                /* set sector offsets for bottom boot block type        */
 265                info->start[0] = base + 0x00000000;
 266                info->start[1] = base + 0x00004000;
 267                info->start[2] = base + 0x00006000;
 268                info->start[3] = base + 0x00008000;
 269                for (i = 4; i < info->sector_count; i++) {
 270                        info->start[i] = base + (i * 0x00010000) - 0x00030000;
 271                }
 272        } else {
 273                /* set sector offsets for top boot block type           */
 274                i = info->sector_count - 1;
 275                info->start[i--] = base + info->size - 0x00004000;
 276                info->start[i--] = base + info->size - 0x00006000;
 277                info->start[i--] = base + info->size - 0x00008000;
 278                for (; i >= 0; i--) {
 279                        info->start[i] = base + i * 0x00010000;
 280                }
 281        }
 282
 283        /* check for protected sectors */
 284        for (i = 0; i < info->sector_count; i++) {
 285                /* read sector protection: D0 = 1 if protected */
 286                caddr = (volatile unsigned char *)(info->start[i]);
 287                info->protect[i] = caddr[4] & 1;
 288        }
 289
 290        /*
 291         * Prevent writes to uninitialized FLASH.
 292         */
 293        if (info->flash_id != FLASH_UNKNOWN) {
 294                caddr = (vu_char *)info->start[0];
 295
 296                *caddr = 0xF0;  /* reset bank */
 297        }
 298
 299        return (info->size);
 300}
 301
 302
 303/*-----------------------------------------------------------------------
 304 */
 305
 306int     flash_erase (flash_info_t *info, int s_first, int s_last)
 307{
 308        vu_char *addr = (vu_char*)(info->start[0]);
 309        int flag, prot, sect, l_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_UNKNOWN) ||
 322            (info->flash_id > FLASH_AMD_COMP)) {
 323                printf ("Can't erase unknown flash type %08lx - aborted\n",
 324                        info->flash_id);
 325                return 1;
 326        }
 327
 328        prot = 0;
 329        for (sect=s_first; sect<=s_last; ++sect) {
 330                if (info->protect[sect]) {
 331                        prot++;
 332                }
 333        }
 334
 335        if (prot) {
 336                printf ("- Warning: %d protected sectors will not be erased!\n",
 337                        prot);
 338        } else {
 339                printf ("\n");
 340        }
 341
 342        l_sect = -1;
 343
 344        /* Disable interrupts which might cause a timeout here */
 345        flag = disable_interrupts();
 346
 347        addr[0x0AAA] = 0xAA;
 348        addr[0x0555] = 0x55;
 349        addr[0x0AAA] = 0x80;
 350        addr[0x0AAA] = 0xAA;
 351        addr[0x0555] = 0x55;
 352
 353        /* Start erase on unprotected sectors */
 354        for (sect = s_first; sect<=s_last; sect++) {
 355                if (info->protect[sect] == 0) { /* not protected */
 356                        addr = (vu_char*)(info->start[sect]);
 357                        addr[0] = 0x30;
 358                        l_sect = sect;
 359                }
 360        }
 361
 362        /* re-enable interrupts if necessary */
 363        if (flag)
 364                enable_interrupts();
 365
 366        /* wait at least 80us - let's wait 1 ms */
 367        udelay (1000);
 368
 369        /*
 370         * We wait for the last triggered sector
 371         */
 372        if (l_sect < 0)
 373                goto DONE;
 374
 375        start = get_timer (0);
 376        last  = start;
 377        addr = (vu_char*)(info->start[l_sect]);
 378        while ((addr[0] & 0x80) != 0x80) {
 379                if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 380                        printf ("Timeout\n");
 381                        return 1;
 382                }
 383                /* show that we're waiting */
 384                if ((now - last) > 1000) {      /* every second */
 385                        putc ('.');
 386                        last = now;
 387                }
 388        }
 389
 390DONE:
 391        /* reset to read mode */
 392        addr = (vu_char *)info->start[0];
 393        addr[0] = 0xF0; /* reset bank */
 394
 395        printf (" done\n");
 396        return 0;
 397}
 398
 399/*-----------------------------------------------------------------------
 400 * Copy memory to flash, returns:
 401 * 0 - OK
 402 * 1 - write timeout
 403 * 2 - Flash not erased
 404 */
 405
 406int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 407{
 408        int rc;
 409
 410        while (cnt > 0) {
 411                if ((rc = write_byte(info, addr++, *src++)) != 0) {
 412                        return (rc);
 413                }
 414                --cnt;
 415        }
 416
 417        return (0);
 418}
 419
 420/*-----------------------------------------------------------------------
 421 * Write a word to Flash, returns:
 422 * 0 - OK
 423 * 1 - write timeout
 424 * 2 - Flash not erased
 425 */
 426static int write_byte (flash_info_t *info, ulong dest, uchar data)
 427{
 428        vu_char *addr = (vu_char*)(info->start[0]);
 429        ulong start;
 430        int flag;
 431
 432        /* Check if Flash is (sufficiently) erased */
 433        if ((*((vu_char *)dest) & data) != data) {
 434                return (2);
 435        }
 436        /* Disable interrupts which might cause a timeout here */
 437        flag = disable_interrupts();
 438
 439        addr[0x0AAA] = 0xAA;
 440        addr[0x0555] = 0x55;
 441        addr[0x0AAA] = 0xA0;
 442
 443        *((vu_char *)dest) = data;
 444
 445        /* re-enable interrupts if necessary */
 446        if (flag)
 447                enable_interrupts();
 448
 449        /* data polling for D7 */
 450        start = get_timer (0);
 451        while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
 452                if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 453                        return (1);
 454                }
 455        }
 456        return (0);
 457}
 458
 459/*-----------------------------------------------------------------------
 460 */
 461