board/sbc8260/flash.c

   1 /*
   2  * (C) Copyright 2000
   3  * Marius Groeger <mgroeger@sysgo.de>
   4  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   5  *
   6  * (C) Copyright 2000
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * Flash Routines for AMD 29F080B devices
  10  *
  11  *--------------------------------------------------------------------
  12  * See file CREDITS for list of people who contributed to this
  13  * project.
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License as
  17  * published by the Free Software Foundation; either version 2 of
  18  * the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  * MA 02111-1307 USA
  29  */
  30
  31 #include <common.h>
  32 #include <mpc8xx.h>
  33
  34 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
  35
  36 /*-----------------------------------------------------------------------
  37  * Functions
  38  */
  39
  40 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  41 static int write_word (flash_info_t *info, ulong dest, ulong data);
  42
  43 /*-----------------------------------------------------------------------
  44  */
  45
  46 unsigned long flash_init (void)
  47 {
  48     unsigned long size;
  49     int i;
  50
  51     /* Init: no FLASHes known */
  52     for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  53         flash_info[i].flash_id = FLASH_UNKNOWN;
  54     }
  55
  56     /* for now, only support the 4 MB Flash SIMM */
  57     size = flash_get_size((vu_long *)CFG_FLASH0_BASE, &flash_info[0]);
  58
  59     /*
  60      * protect monitor and environment sectors
  61      */
  62
  63 #if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
  64     flash_protect(FLAG_PROTECT_SET,
  65                   CFG_MONITOR_BASE,
  66                   CFG_MONITOR_BASE+monitor_flash_len-1,
  67                   &flash_info[0]);
  68 #endif
  69
  70 #if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
  71 # ifndef  CFG_ENV_SIZE
  72 #  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
  73 # endif
  74     flash_protect(FLAG_PROTECT_SET,
  75                   CFG_ENV_ADDR,
  76                   CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
  77                   &flash_info[0]);
  78 #endif
  79
  80     return /*size*/ (CFG_FLASH0_SIZE * 1024 * 1024);
  81 }
  82
  83 /*-----------------------------------------------------------------------
  84  */
  85 void flash_print_info  (flash_info_t *info)
  86 {
  87     int i;
  88
  89     if (info->flash_id == FLASH_UNKNOWN) {
  90         printf ("missing or unknown FLASH type\n");
  91         return;
  92     }
  93
  94     switch ((info->flash_id >> 16) & 0xff) {
  95     case 0x1:
  96         printf ("AMD ");
  97         break;
  98     default:
  99         printf ("Unknown Vendor ");
 100         break;
 101     }
 102
 103     switch (info->flash_id & FLASH_TYPEMASK) {
 104     case AMD_ID_F040B:
 105         printf ("AM29F040B (4 Mbit)\n");
 106         break;
 107     case AMD_ID_F080B:
 108         printf ("AM29F080B (8 Mbit)\n");
 109         break;
 110     default:
 111         printf ("Unknown Chip Type\n");
 112         break;
 113     }
 114
 115     printf ("  Size: %ld MB in %d Sectors\n",
 116             info->size >> 20, info->sector_count);
 117
 118     printf ("  Sector Start Addresses:");
 119     for (i=0; i<info->sector_count; ++i) {
 120         if ((i % 5) == 0)
 121           printf ("\n   ");
 122         printf (" %08lX%s",
 123                 info->start[i],
 124                 info->protect[i] ? " (RO)" : "     "
 125                 );
 126     }
 127     printf ("\n");
 128     return;
 129 }
 130
 131 /*
 132  * The following code cannot be run from FLASH!
 133  */
 134
 135 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 136 {
 137     short i;
 138     vu_long vendor, devid;
 139     ulong base = (ulong)addr;
 140
 141 /*    printf("addr   = %08lx\n", (unsigned long)addr); */
 142
 143     /* Reset and Write auto select command: read Manufacturer ID */
 144     addr[0] = 0xf0f0f0f0;
 145     addr[0x0555] = 0xAAAAAAAA;
 146     addr[0x02AA] = 0x55555555;
 147     addr[0x0555] = 0x90909090;
 148     udelay (1000);
 149
 150     vendor = addr[0];
 151 /*    printf("vendor = %08lx\n", vendor); */
 152     if (vendor != 0x01010101) {
 153         info->size = 0;
 154         goto out;
 155     }
 156
 157     devid = addr[1];
 158 /*    printf("devid  = %08lx\n", devid); */
 159
 160     if ((devid & 0xff) == AMD_ID_F080B) {
 161         info->flash_id     = (vendor & 0xff) << 16 | AMD_ID_F080B;
 162         /* we have 16 sectors with 64KB each x 4 */
 163         info->sector_count = 16;
 164         info->size         = 4 * info->sector_count * 64*1024;
 165     }
 166     else {
 167         info->size = 0;
 168         goto out;
 169     }
 170
 171     /* check for protected sectors */
 172     for (i = 0; i < info->sector_count; i++) {
 173         /* sector base address */
 174         info->start[i] = base + i * (info->size / info->sector_count);
 175         /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 176         /* D0 = 1 if protected */
 177         addr = (volatile unsigned long *)(info->start[i]);
 178         info->protect[i] = addr[2] & 1;
 179     }
 180
 181     /* reset command */
 182     addr = (vu_long *)info->start[0];
 183
 184 out:
 185     addr[0] = 0xf0f0f0f0;
 186
 187     return info->size;
 188 }
 189
 190
 191 /*-----------------------------------------------------------------------
 192  */
 193
 194 int flash_erase (flash_info_t *info, int s_first, int s_last)
 195 {
 196     vu_long *addr = (vu_long*)(info->start[0]);
 197     int flag, prot, sect, l_sect;
 198     ulong start, now, last;
 199
 200     if ((s_first < 0) || (s_first > s_last)) {
 201         if (info->flash_id == FLASH_UNKNOWN) {
 202             printf ("- missing\n");
 203         } else {
 204             printf ("- no sectors to erase\n");
 205         }
 206         return 1;
 207     }
 208
 209     prot = 0;
 210     for (sect = s_first; sect <= s_last; sect++) {
 211         if (info->protect[sect]) {
 212             prot++;
 213         }
 214     }
 215
 216     if (prot) {
 217         printf ("- Warning: %d protected sectors will not be erased!\n",
 218                 prot);
 219     } else {
 220         printf ("\n");
 221     }
 222
 223     l_sect = -1;
 224
 225     /* Disable interrupts which might cause a timeout here */
 226     flag = disable_interrupts();
 227
 228     addr[0x0555] = 0xAAAAAAAA;
 229     addr[0x02AA] = 0x55555555;
 230     addr[0x0555] = 0x80808080;
 231     addr[0x0555] = 0xAAAAAAAA;
 232     addr[0x02AA] = 0x55555555;
 233     udelay (100);
 234
 235     /* Start erase on unprotected sectors */
 236     for (sect = s_first; sect<=s_last; sect++) {
 237         if (info->protect[sect] == 0) { /* not protected */
 238             addr = (vu_long*)(info->start[sect]);
 239             addr[0] = 0x30303030;
 240             l_sect = sect;
 241         }
 242     }
 243
 244     /* re-enable interrupts if necessary */
 245     if (flag)
 246       enable_interrupts();
 247
 248     /* wait at least 80us - let's wait 1 ms */
 249     udelay (1000);
 250
 251     /*
 252      * We wait for the last triggered sector
 253      */
 254     if (l_sect < 0)
 255       goto DONE;
 256
 257     start = get_timer (0);
 258     last  = start;
 259     addr = (vu_long*)(info->start[l_sect]);
 260     while ((addr[0] & 0x80808080) != 0x80808080) {
 261         if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 262             printf ("Timeout\n");
 263             return 1;
 264         }
 265         /* show that we're waiting */
 266         if ((now - last) > 1000) {      /* every second */
 267             serial_putc ('.');
 268             last = now;
 269         }
 270     }
 271
 272     DONE:
 273     /* reset to read mode */
 274     addr = (volatile unsigned long *)info->start[0];
 275     addr[0] = 0xF0F0F0F0;       /* reset bank */
 276
 277     printf (" done\n");
 278     return 0;
 279 }
 280
 281 /*-----------------------------------------------------------------------
 282  * Copy memory to flash, returns:
 283  * 0 - OK
 284  * 1 - write timeout
 285  * 2 - Flash not erased
 286  */
 287
 288 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 289 {
 290     ulong cp, wp, data;
 291     int i, l, rc;
 292
 293     wp = (addr & ~3);   /* get lower word aligned address */
 294
 295     /*
 296      * handle unaligned start bytes
 297      */
 298     if ((l = addr - wp) != 0) {
 299         data = 0;
 300         for (i=0, cp=wp; i<l; ++i, ++cp) {
 301             data = (data << 8) | (*(uchar *)cp);
 302         }
 303         for (; i<4 && cnt>0; ++i) {
 304             data = (data << 8) | *src++;
 305             --cnt;
 306             ++cp;
 307         }
 308         for (; cnt==0 && i<4; ++i, ++cp) {
 309             data = (data << 8) | (*(uchar *)cp);
 310         }
 311
 312         if ((rc = write_word(info, wp, data)) != 0) {
 313             return (rc);
 314         }
 315         wp += 4;
 316     }
 317
 318     /*
 319      * handle word aligned part
 320      */
 321     while (cnt >= 4) {
 322         data = 0;
 323         for (i=0; i<4; ++i) {
 324             data = (data << 8) | *src++;
 325         }
 326         if ((rc = write_word(info, wp, data)) != 0) {
 327             return (rc);
 328         }
 329         wp  += 4;
 330         cnt -= 4;
 331     }
 332
 333     if (cnt == 0) {
 334         return (0);
 335     }
 336
 337     /*
 338      * handle unaligned tail bytes
 339      */
 340     data = 0;
 341     for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 342         data = (data << 8) | *src++;
 343         --cnt;
 344     }
 345     for (; i<4; ++i, ++cp) {
 346         data = (data << 8) | (*(uchar *)cp);
 347     }
 348
 349     return (write_word(info, wp, data));
 350 }
 351
 352 /*-----------------------------------------------------------------------
 353  * Write a word to Flash, returns:
 354  * 0 - OK
 355  * 1 - write timeout
 356  * 2 - Flash not erased
 357  */
 358 static int write_word (flash_info_t *info, ulong dest, ulong data)
 359 {
 360     vu_long *addr = (vu_long*)(info->start[0]);
 361     ulong start;
 362     int flag;
 363
 364     /* Check if Flash is (sufficiently) erased */
 365     if ((*((vu_long *)dest) & data) != data) {
 366         return (2);
 367     }
 368     /* Disable interrupts which might cause a timeout here */
 369     flag = disable_interrupts();
 370
 371     addr[0x0555] = 0xAAAAAAAA;
 372     addr[0x02AA] = 0x55555555;
 373     addr[0x0555] = 0xA0A0A0A0;
 374
 375     *((vu_long *)dest) = data;
 376
 377     /* re-enable interrupts if necessary */
 378     if (flag)
 379       enable_interrupts();
 380
 381     /* data polling for D7 */
 382     start = get_timer (0);
 383     while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
 384         if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 385             return (1);
 386         }
 387     }
 388     return (0);
 389 }
 390
 391 /*-----------------------------------------------------------------------
 392  */