drivers/mtd/jedec_flash.c

   1 /*
   2  * (C) Copyright 2007
   3  * Michael Schwingen, <michael@schwingen.org>
   4  *
   5  * based in great part on jedec_probe.c from linux kernel:
   6  * (C) 2000 Red Hat. GPL'd.
   7  * Occasionally maintained by Thayne Harbaugh tharbaugh at lnxi dot com
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  *
  27  */
  28
  29 /* The DEBUG define must be before common to enable debugging */
  30 /*#define DEBUG*/
  31
  32 #include <common.h>
  33 #include <asm/processor.h>
  34 #include <asm/io.h>
  35 #include <asm/byteorder.h>
  36 #include <environment.h>
  37
  38 #define P_ID_AMD_STD CFI_CMDSET_AMD_LEGACY
  39
  40 /* Manufacturers */
  41 #define MANUFACTURER_AMD        0x0001
  42 #define MANUFACTURER_SST        0x00BF
  43
  44 /* AMD */
  45 #define AM29DL800BB     0x22C8
  46 #define AM29DL800BT     0x224A
  47
  48 #define AM29F800BB      0x2258
  49 #define AM29F800BT      0x22D6
  50 #define AM29LV400BB     0x22BA
  51 #define AM29LV400BT     0x22B9
  52 #define AM29LV800BB     0x225B
  53 #define AM29LV800BT     0x22DA
  54 #define AM29LV160DT     0x22C4
  55 #define AM29LV160DB     0x2249
  56 #define AM29F017D       0x003D
  57 #define AM29F016D       0x00AD
  58 #define AM29F080        0x00D5
  59 #define AM29F040        0x00A4
  60 #define AM29LV040B      0x004F
  61 #define AM29F032B       0x0041
  62 #define AM29F002T       0x00B0
  63
  64 /* SST */
  65 #define SST39LF800      0x2781
  66 #define SST39LF160      0x2782
  67 #define SST39VF1601     0x234b
  68 #define SST39LF512      0x00D4
  69 #define SST39LF010      0x00D5
  70 #define SST39LF020      0x00D6
  71 #define SST39LF040      0x00D7
  72 #define SST39SF010A     0x00B5
  73 #define SST39SF020A     0x00B6
  74
  75
  76 /*
  77  * Unlock address sets for AMD command sets.
  78  * Intel command sets use the MTD_UADDR_UNNECESSARY.
  79  * Each identifier, except MTD_UADDR_UNNECESSARY, and
  80  * MTD_UADDR_NO_SUPPORT must be defined below in unlock_addrs[].
  81  * MTD_UADDR_NOT_SUPPORTED must be 0 so that structure
  82  * initialization need not require initializing all of the
  83  * unlock addresses for all bit widths.
  84  */
  85 enum uaddr {
  86         MTD_UADDR_NOT_SUPPORTED = 0,    /* data width not supported */
  87         MTD_UADDR_0x0555_0x02AA,
  88         MTD_UADDR_0x0555_0x0AAA,
  89         MTD_UADDR_0x5555_0x2AAA,
  90         MTD_UADDR_0x0AAA_0x0555,
  91         MTD_UADDR_DONT_CARE,            /* Requires an arbitrary address */
  92         MTD_UADDR_UNNECESSARY,          /* Does not require any address */
  93 };
  94
  95
  96 struct unlock_addr {
  97         u32 addr1;
  98         u32 addr2;
  99 };
 100
 101
 102 /*
 103  * I don't like the fact that the first entry in unlock_addrs[]
 104  * exists, but is for MTD_UADDR_NOT_SUPPORTED - and, therefore,
 105  * should not be used.  The  problem is that structures with
 106  * initializers have extra fields initialized to 0.  It is _very_
 107  * desireable to have the unlock address entries for unsupported
 108  * data widths automatically initialized - that means that
 109  * MTD_UADDR_NOT_SUPPORTED must be 0 and the first entry here
 110  * must go unused.
 111  */
 112 static const struct unlock_addr  unlock_addrs[] = {
 113         [MTD_UADDR_NOT_SUPPORTED] = {
 114                 .addr1 = 0xffff,
 115                 .addr2 = 0xffff
 116         },
 117
 118         [MTD_UADDR_0x0555_0x02AA] = {
 119                 .addr1 = 0x0555,
 120                 .addr2 = 0x02aa
 121         },
 122
 123         [MTD_UADDR_0x0555_0x0AAA] = {
 124                 .addr1 = 0x0555,
 125                 .addr2 = 0x0aaa
 126         },
 127
 128         [MTD_UADDR_0x5555_0x2AAA] = {
 129                 .addr1 = 0x5555,
 130                 .addr2 = 0x2aaa
 131         },
 132
 133         [MTD_UADDR_0x0AAA_0x0555] = {
 134                 .addr1 = 0x0AAA,
 135                 .addr2 = 0x0555
 136         },
 137
 138         [MTD_UADDR_DONT_CARE] = {
 139                 .addr1 = 0x0000,      /* Doesn't matter which address */
 140                 .addr2 = 0x0000       /* is used - must be last entry */
 141         },
 142
 143         [MTD_UADDR_UNNECESSARY] = {
 144                 .addr1 = 0x0000,
 145                 .addr2 = 0x0000
 146         }
 147 };
 148
 149
 150 struct amd_flash_info {
 151         const __u16 mfr_id;
 152         const __u16 dev_id;
 153         const char *name;
 154         const int DevSize;
 155         const int NumEraseRegions;
 156         const int CmdSet;
 157         const __u8 uaddr[4];            /* unlock addrs for 8, 16, 32, 64 */
 158         const ulong regions[6];
 159 };
 160
 161 #define ERASEINFO(size,blocks) (size<<8)|(blocks-1)
 162
 163 #define SIZE_64KiB  16
 164 #define SIZE_128KiB 17
 165 #define SIZE_256KiB 18
 166 #define SIZE_512KiB 19
 167 #define SIZE_1MiB   20
 168 #define SIZE_2MiB   21
 169 #define SIZE_4MiB   22
 170 #define SIZE_8MiB   23
 171
 172 static const struct amd_flash_info jedec_table[] = {
 173 #ifdef CFG_FLASH_LEGACY_256Kx8
 174         {
 175                 .mfr_id         = MANUFACTURER_SST,
 176                 .dev_id         = SST39LF020,
 177                 .name           = "SST 39LF020",
 178                 .uaddr          = {
 179                         [0] = MTD_UADDR_0x5555_0x2AAA /* x8 */
 180                 },
 181                 .DevSize        = SIZE_256KiB,
 182                 .CmdSet         = P_ID_AMD_STD,
 183                 .NumEraseRegions= 1,
 184                 .regions        = {
 185                         ERASEINFO(0x01000,64),
 186                 }
 187         },
 188 #endif
 189 #ifdef CFG_FLASH_LEGACY_512Kx8
 190         {
 191                 .mfr_id         = MANUFACTURER_AMD,
 192                 .dev_id         = AM29LV040B,
 193                 .name           = "AMD AM29LV040B",
 194                 .uaddr          = {
 195                         [0] = MTD_UADDR_0x0555_0x02AA /* x8 */
 196                 },
 197                 .DevSize        = SIZE_512KiB,
 198                 .CmdSet         = P_ID_AMD_STD,
 199                 .NumEraseRegions= 1,
 200                 .regions        = {
 201                         ERASEINFO(0x10000,8),
 202                 }
 203         },
 204         {
 205                 .mfr_id         = MANUFACTURER_SST,
 206                 .dev_id         = SST39LF040,
 207                 .name           = "SST 39LF040",
 208                 .uaddr          = {
 209                         [0] = MTD_UADDR_0x5555_0x2AAA /* x8 */
 210                 },
 211                 .DevSize        = SIZE_512KiB,
 212                 .CmdSet         = P_ID_AMD_STD,
 213                 .NumEraseRegions= 1,
 214                 .regions        = {
 215                         ERASEINFO(0x01000,128),
 216                 }
 217         },
 218 #endif
 219 };
 220
 221
 222 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 223
 224
 225 static inline void fill_info(flash_info_t *info, const struct amd_flash_info *jedec_entry, ulong base)
 226 {
 227         int i,j;
 228         int sect_cnt;
 229         int size_ratio;
 230         int total_size;
 231         enum uaddr uaddr_idx;
 232
 233         size_ratio = info->portwidth / info->chipwidth;
 234
 235         debug("Found JEDEC Flash: %s\n", jedec_entry->name);
 236         info->vendor = jedec_entry->CmdSet;
 237         /* Todo: do we need device-specific timeouts? */
 238         info->erase_blk_tout = 30000;
 239         info->buffer_write_tout = 1000;
 240         info->write_tout = 100;
 241         info->name = jedec_entry->name;
 242
 243         /* copy unlock addresses from device table to CFI info struct. This
 244            is just here because the addresses are in the table anyway - if
 245            the flash is not detected due to wrong unlock addresses,
 246            flash_detect_legacy would have to try all of them before we even
 247            get here. */
 248         switch(info->chipwidth) {
 249         case FLASH_CFI_8BIT:
 250                 uaddr_idx = jedec_entry->uaddr[0];
 251                 break;
 252         case FLASH_CFI_16BIT:
 253                 uaddr_idx = jedec_entry->uaddr[1];
 254                 break;
 255         case FLASH_CFI_32BIT:
 256                 uaddr_idx = jedec_entry->uaddr[2];
 257                 break;
 258         default:
 259                 uaddr_idx = MTD_UADDR_NOT_SUPPORTED;
 260                 break;
 261         }
 262
 263         debug("unlock address index %d\n", uaddr_idx);
 264         info->addr_unlock1 = unlock_addrs[uaddr_idx].addr1;
 265         info->addr_unlock2 = unlock_addrs[uaddr_idx].addr2;
 266         debug("unlock addresses are 0x%x/0x%x\n", info->addr_unlock1, info->addr_unlock2);
 267
 268         sect_cnt = 0;
 269         total_size = 0;
 270         for (i = 0; i < jedec_entry->NumEraseRegions; i++) {
 271                 ulong erase_region_size = jedec_entry->regions[i] >> 8;
 272                 ulong erase_region_count = (jedec_entry->regions[i] & 0xff) + 1;
 273
 274                 total_size += erase_region_size * erase_region_count;
 275                 debug ("erase_region_count = %d erase_region_size = %d\n",
 276                        erase_region_count, erase_region_size);
 277                 for (j = 0; j < erase_region_count; j++) {
 278                         if (sect_cnt >= CFG_MAX_FLASH_SECT) {
 279                                 printf("ERROR: too many flash sectors\n");
 280                                 break;
 281                         }
 282                         info->start[sect_cnt] = base;
 283                         base += (erase_region_size * size_ratio);
 284                         sect_cnt++;
 285                 }
 286         }
 287         info->sector_count = sect_cnt;
 288         info->size = total_size * size_ratio;
 289 }
 290
 291 /*-----------------------------------------------------------------------
 292  * match jedec ids against table. If a match is found, fill flash_info entry
 293  */
 294 int jedec_flash_match(flash_info_t *info, ulong base)
 295 {
 296         int ret = 0;
 297         int i;
 298         ulong mask = 0xFFFF;
 299         if (info->chipwidth == 1)
 300                 mask = 0xFF;
 301
 302         for (i = 0; i < ARRAY_SIZE(jedec_table); i++) {
 303                 if ((jedec_table[i].mfr_id & mask) == (info->manufacturer_id & mask) &&
 304                     (jedec_table[i].dev_id & mask) == (info->device_id & mask)) {
 305                         fill_info(info, &jedec_table[i], base);
 306                         ret = 1;
 307                         break;
 308                 }
 309         }
 310         return ret;
 311 }