board/idmr/flash.c

   1 /*
   2  * (C) Copyright 2000-2006
   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
  26 #define PHYS_FLASH_1 CFG_FLASH_BASE
  27 #define FLASH_BANK_SIZE 0x800000
  28 #define EN29LV640 0x227e227e
  29
  30 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
  31
  32 void flash_print_info (flash_info_t * info)
  33 {
  34         int i;
  35
  36         switch (info->flash_id & FLASH_VENDMASK) {
  37         case (AMD_MANUFACT & FLASH_VENDMASK):
  38                 printf ("AMD: ");
  39                 break;
  40         default:
  41                 printf ("Unknown Vendor ");
  42                 break;
  43         }
  44
  45         switch (info->flash_id & FLASH_TYPEMASK) {
  46         case (EN29LV640 & FLASH_TYPEMASK):
  47                 printf ("EN29LV640 (16Mbit)\n");
  48                 break;
  49         default:
  50                 printf ("Unknown Chip Type\n");
  51                 goto Done;
  52                 break;
  53         }
  54
  55         printf ("  Size: %ld MB in %d Sectors\n",
  56                 info->size >> 20, info->sector_count);
  57
  58         printf ("  Sector Start Addresses:");
  59         for (i = 0; i < info->sector_count; i++) {
  60                 if ((i % 5) == 0) {
  61                         printf ("\n   ");
  62                 }
  63                 printf (" %08lX%s", info->start[i],
  64                         info->protect[i] ? " (RO)" : "     ");
  65         }
  66         printf ("\n");
  67
  68       Done:
  69         return;
  70 }
  71
  72
  73 unsigned long flash_init (void)
  74 {
  75         int i, j;
  76         ulong size = 0;
  77
  78         for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
  79                 ulong flashbase = 0;
  80
  81                 flash_info[i].flash_id =
  82                         (AMD_MANUFACT & FLASH_VENDMASK) |
  83                         (EN29LV640 & FLASH_TYPEMASK);
  84                 flash_info[i].size = FLASH_BANK_SIZE;
  85                 flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
  86                 memset (flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
  87                 if (i == 0)
  88                         flashbase = PHYS_FLASH_1;
  89                 else
  90                         panic ("configured to many flash banks!\n");
  91
  92                 for (j = 0; j < flash_info[i].sector_count; j++) {
  93                         flash_info[i].start[j] = flashbase + 0x10000 * j;
  94                 }
  95                 size += flash_info[i].size;
  96         }
  97
  98         flash_protect (FLAG_PROTECT_SET,
  99                        CFG_FLASH_BASE,
 100                        CFG_FLASH_BASE + 0x2ffff, &flash_info[0]);
 101
 102         return size;
 103 }
 104
 105
 106 #define CMD_READ_ARRAY          0x00F0
 107 #define CMD_UNLOCK1             0x00AA
 108 #define CMD_UNLOCK2             0x0055
 109 #define CMD_ERASE_SETUP         0x0080
 110 #define CMD_ERASE_CONFIRM       0x0030
 111 #define CMD_PROGRAM             0x00A0
 112 #define CMD_UNLOCK_BYPASS       0x0020
 113
 114 #define MEM_FLASH_ADDR1         (*(volatile u16 *)(CFG_FLASH_BASE + (0x00000555<<1)))
 115 #define MEM_FLASH_ADDR2         (*(volatile u16 *)(CFG_FLASH_BASE + (0x000002AA<<1)))
 116
 117 #define BIT_ERASE_DONE          0x0080
 118 #define BIT_RDY_MASK            0x0080
 119 #define BIT_PROGRAM_ERROR       0x0020
 120 #define BIT_TIMEOUT             0x80000000      /* our flag */
 121
 122 #define READY 1
 123 #define ERR   2
 124 #define TMO   4
 125
 126
 127 int flash_erase (flash_info_t * info, int s_first, int s_last)
 128 {
 129         ulong result;
 130         int iflag, prot, sect;
 131         int rc = ERR_OK;
 132         int chip1;
 133
 134         /* first look for protection bits */
 135
 136         if (info->flash_id == FLASH_UNKNOWN)
 137                 return ERR_UNKNOWN_FLASH_TYPE;
 138
 139         if ((s_first < 0) || (s_first > s_last)) {
 140                 return ERR_INVAL;
 141         }
 142
 143         if ((info->flash_id & FLASH_VENDMASK) !=
 144             (AMD_MANUFACT & FLASH_VENDMASK)) {
 145                 return ERR_UNKNOWN_FLASH_VENDOR;
 146         }
 147
 148         prot = 0;
 149         for (sect = s_first; sect <= s_last; ++sect) {
 150                 if (info->protect[sect]) {
 151                         prot++;
 152                 }
 153         }
 154         if (prot)
 155                 return ERR_PROTECTED;
 156
 157         /*
 158          * Disable interrupts which might cause a timeout
 159          * here. Remember that our exception vectors are
 160          * at address 0 in the flash, and we don't want a
 161          * (ticker) exception to happen while the flash
 162          * chip is in programming mode.
 163          */
 164         iflag = disable_interrupts ();
 165
 166         printf ("\n");
 167
 168         /* Start erase on unprotected sectors */
 169         for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
 170                 printf ("Erasing sector %2d ... ", sect);
 171
 172                 /* arm simple, non interrupt dependent timer */
 173                 set_timer (0);
 174
 175                 if (info->protect[sect] == 0) { /* not protected */
 176                         volatile u16 *addr =
 177                                 (volatile u16 *) (info->start[sect]);
 178
 179                         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 180                         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 181                         MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;
 182
 183                         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 184                         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 185                         *addr = CMD_ERASE_CONFIRM;
 186
 187                         /* wait until flash is ready */
 188                         chip1 = 0;
 189
 190                         do {
 191                                 result = *addr;
 192
 193                                 /* check timeout */
 194                                 if (get_timer (0) > CFG_FLASH_ERASE_TOUT * CFG_HZ / 1000) {
 195                                         MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
 196                                         chip1 = TMO;
 197                                         break;
 198                                 }
 199
 200                                 if (!chip1
 201                                     && (result & 0xFFFF) & BIT_ERASE_DONE)
 202                                         chip1 = READY;
 203
 204                         } while (!chip1);
 205
 206                         MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
 207
 208                         if (chip1 == ERR) {
 209                                 rc = ERR_PROG_ERROR;
 210                                 goto outahere;
 211                         }
 212                         if (chip1 == TMO) {
 213                                 rc = ERR_TIMOUT;
 214                                 goto outahere;
 215                         }
 216
 217                         printf ("ok.\n");
 218                 } else {        /* it was protected */
 219
 220                         printf ("protected!\n");
 221                 }
 222         }
 223
 224         if (ctrlc ())
 225                 printf ("User Interrupt!\n");
 226
 227       outahere:
 228         /* allow flash to settle - wait 10 ms */
 229         printf("Waiting 10 ms...");
 230          udelay (10000);
 231
 232 /*      for (i = 0; i < 10 * 1000 * 1000; ++i)
 233                 asm(" nop");
 234 */
 235
 236         printf("done\n");
 237         if (iflag)
 238                 enable_interrupts ();
 239
 240
 241         return rc;
 242 }
 243
 244 static int write_word (flash_info_t * info, ulong dest, ulong data)
 245 {
 246         volatile u16 *addr = (volatile u16 *) dest;
 247         ulong result;
 248         int rc = ERR_OK;
 249         int iflag;
 250         int chip1;
 251
 252         /*
 253          * Check if Flash is (sufficiently) erased
 254          */
 255         result = *addr;
 256         if ((result & data) != data)
 257                 return ERR_NOT_ERASED;
 258
 259
 260         /*
 261          * Disable interrupts which might cause a timeout
 262          * here. Remember that our exception vectors are
 263          * at address 0 in the flash, and we don't want a
 264          * (ticker) exception to happen while the flash
 265          * chip is in programming mode.
 266          */
 267         iflag = disable_interrupts ();
 268
 269         MEM_FLASH_ADDR1 = CMD_UNLOCK1;
 270         MEM_FLASH_ADDR2 = CMD_UNLOCK2;
 271         MEM_FLASH_ADDR1 = CMD_PROGRAM;
 272         *addr = data;
 273
 274         /* arm simple, non interrupt dependent timer */
 275         set_timer (0);
 276
 277         /* wait until flash is ready */
 278         chip1 = 0;
 279         do {
 280                 result = *addr;
 281
 282                 /* check timeout */
 283                 if (get_timer (0) > CFG_FLASH_ERASE_TOUT * CFG_HZ / 1000) {
 284                         chip1 = ERR | TMO;
 285                         break;
 286                 }
 287                 if (!chip1 && ((result & 0x80) == (data & 0x80)))
 288                         chip1 = READY;
 289
 290         } while (!chip1);
 291
 292         *addr = CMD_READ_ARRAY;
 293
 294         if (chip1 == ERR || *addr != data)
 295                 rc = ERR_PROG_ERROR;
 296
 297         if (iflag)
 298                 enable_interrupts ();
 299
 300         return rc;
 301 }
 302
 303
 304 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 305 {
 306         ulong wp, data;
 307         int rc;
 308
 309         if (addr & 1) {
 310                 printf ("unaligned destination not supported\n");
 311                 return ERR_ALIGN;
 312         }
 313
 314 #if 0
 315         if (cnt & 1) {
 316                 printf ("odd transfer sizes not supported\n");
 317                 return ERR_ALIGN;
 318         }
 319 #endif
 320
 321         wp = addr;
 322
 323         if (addr & 1) {
 324                 data = (*((volatile u8 *) addr) << 8) | *((volatile u8 *)
 325                                                           src);
 326                 if ((rc = write_word (info, wp - 1, data)) != 0) {
 327                         return (rc);
 328                 }
 329                 src += 1;
 330                 wp += 1;
 331                 cnt -= 1;
 332         }
 333
 334         while (cnt >= 2) {
 335                 data = *((volatile u16 *) src);
 336                 if ((rc = write_word (info, wp, data)) != 0) {
 337                         return (rc);
 338                 }
 339                 src += 2;
 340                 wp += 2;
 341                 cnt -= 2;
 342         }
 343
 344         if (cnt == 1) {
 345                 data = (*((volatile u8 *) src) << 8) |
 346                         *((volatile u8 *) (wp + 1));
 347                 if ((rc = write_word (info, wp, data)) != 0) {
 348                         return (rc);
 349                 }
 350                 src += 1;
 351                 wp += 1;
 352                 cnt -= 1;
 353         }
 354
 355         return ERR_OK;
 356 }