include/linux/mtd/cfi.h

   1 /*
   2  * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org> et al.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  *
  18  */
  19
  20 #ifndef __MTD_CFI_H__
  21 #define __MTD_CFI_H__
  22
  23 #include <linux/delay.h>
  24 #include <linux/types.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/mtd/flashchip.h>
  27 #include <linux/mtd/map.h>
  28 #include <linux/mtd/cfi_endian.h>
  29 #include <linux/mtd/xip.h>
  30
  31 #ifdef CONFIG_MTD_CFI_I1
  32 #define cfi_interleave(cfi) 1
  33 #define cfi_interleave_is_1(cfi) (cfi_interleave(cfi) == 1)
  34 #else
  35 #define cfi_interleave_is_1(cfi) (0)
  36 #endif
  37
  38 #ifdef CONFIG_MTD_CFI_I2
  39 # ifdef cfi_interleave
  40 #  undef cfi_interleave
  41 #  define cfi_interleave(cfi) ((cfi)->interleave)
  42 # else
  43 #  define cfi_interleave(cfi) 2
  44 # endif
  45 #define cfi_interleave_is_2(cfi) (cfi_interleave(cfi) == 2)
  46 #else
  47 #define cfi_interleave_is_2(cfi) (0)
  48 #endif
  49
  50 #ifdef CONFIG_MTD_CFI_I4
  51 # ifdef cfi_interleave
  52 #  undef cfi_interleave
  53 #  define cfi_interleave(cfi) ((cfi)->interleave)
  54 # else
  55 #  define cfi_interleave(cfi) 4
  56 # endif
  57 #define cfi_interleave_is_4(cfi) (cfi_interleave(cfi) == 4)
  58 #else
  59 #define cfi_interleave_is_4(cfi) (0)
  60 #endif
  61
  62 #ifdef CONFIG_MTD_CFI_I8
  63 # ifdef cfi_interleave
  64 #  undef cfi_interleave
  65 #  define cfi_interleave(cfi) ((cfi)->interleave)
  66 # else
  67 #  define cfi_interleave(cfi) 8
  68 # endif
  69 #define cfi_interleave_is_8(cfi) (cfi_interleave(cfi) == 8)
  70 #else
  71 #define cfi_interleave_is_8(cfi) (0)
  72 #endif
  73
  74 #ifndef cfi_interleave
  75 #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.
  76 static inline int cfi_interleave(void *cfi)
  77 {
  78         BUG();
  79         return 0;
  80 }
  81 #endif
  82
  83 static inline int cfi_interleave_supported(int i)
  84 {
  85         switch (i) {
  86 #ifdef CONFIG_MTD_CFI_I1
  87         case 1:
  88 #endif
  89 #ifdef CONFIG_MTD_CFI_I2
  90         case 2:
  91 #endif
  92 #ifdef CONFIG_MTD_CFI_I4
  93         case 4:
  94 #endif
  95 #ifdef CONFIG_MTD_CFI_I8
  96         case 8:
  97 #endif
  98                 return 1;
  99
 100         default:
 101                 return 0;
 102         }
 103 }
 104
 105
 106 /* NB: these values must represents the number of bytes needed to meet the
 107  *     device type (x8, x16, x32).  Eg. a 32 bit device is 4 x 8 bytes.
 108  *     These numbers are used in calculations.
 109  */
 110 #define CFI_DEVICETYPE_X8  (8 / 8)
 111 #define CFI_DEVICETYPE_X16 (16 / 8)
 112 #define CFI_DEVICETYPE_X32 (32 / 8)
 113 #define CFI_DEVICETYPE_X64 (64 / 8)
 114
 115
 116 /* Device Interface Code Assignments from the "Common Flash Memory Interface
 117  * Publication 100" dated December 1, 2001.
 118  */
 119 #define CFI_INTERFACE_X8_ASYNC          0x0000
 120 #define CFI_INTERFACE_X16_ASYNC         0x0001
 121 #define CFI_INTERFACE_X8_BY_X16_ASYNC   0x0002
 122 #define CFI_INTERFACE_X32_ASYNC         0x0003
 123 #define CFI_INTERFACE_X16_BY_X32_ASYNC  0x0005
 124 #define CFI_INTERFACE_NOT_ALLOWED       0xffff
 125
 126
 127 /* NB: We keep these structures in memory in HOST byteorder, except
 128  * where individually noted.
 129  */
 130
 131 /* Basic Query Structure */
 132 struct cfi_ident {
 133         uint8_t  qry[3];
 134         uint16_t P_ID;
 135         uint16_t P_ADR;
 136         uint16_t A_ID;
 137         uint16_t A_ADR;
 138         uint8_t  VccMin;
 139         uint8_t  VccMax;
 140         uint8_t  VppMin;
 141         uint8_t  VppMax;
 142         uint8_t  WordWriteTimeoutTyp;
 143         uint8_t  BufWriteTimeoutTyp;
 144         uint8_t  BlockEraseTimeoutTyp;
 145         uint8_t  ChipEraseTimeoutTyp;
 146         uint8_t  WordWriteTimeoutMax;
 147         uint8_t  BufWriteTimeoutMax;
 148         uint8_t  BlockEraseTimeoutMax;
 149         uint8_t  ChipEraseTimeoutMax;
 150         uint8_t  DevSize;
 151         uint16_t InterfaceDesc;
 152         uint16_t MaxBufWriteSize;
 153         uint8_t  NumEraseRegions;
 154         uint32_t EraseRegionInfo[0]; /* Not host ordered */
 155 } __attribute__((packed));
 156
 157 /* Extended Query Structure for both PRI and ALT */
 158
 159 struct cfi_extquery {
 160         uint8_t  pri[3];
 161         uint8_t  MajorVersion;
 162         uint8_t  MinorVersion;
 163 } __attribute__((packed));
 164
 165 /* Vendor-Specific PRI for Intel/Sharp Extended Command Set (0x0001) */
 166
 167 struct cfi_pri_intelext {
 168         uint8_t  pri[3];
 169         uint8_t  MajorVersion;
 170         uint8_t  MinorVersion;
 171         uint32_t FeatureSupport; /* if bit 31 is set then an additional uint32_t feature
 172                                     block follows - FIXME - not currently supported */
 173         uint8_t  SuspendCmdSupport;
 174         uint16_t BlkStatusRegMask;
 175         uint8_t  VccOptimal;
 176         uint8_t  VppOptimal;
 177         uint8_t  NumProtectionFields;
 178         uint16_t ProtRegAddr;
 179         uint8_t  FactProtRegSize;
 180         uint8_t  UserProtRegSize;
 181         uint8_t  extra[0];
 182 } __attribute__((packed));
 183
 184 struct cfi_intelext_otpinfo {
 185         uint32_t ProtRegAddr;
 186         uint16_t FactGroups;
 187         uint8_t  FactProtRegSize;
 188         uint16_t UserGroups;
 189         uint8_t  UserProtRegSize;
 190 } __attribute__((packed));
 191
 192 struct cfi_intelext_blockinfo {
 193         uint16_t NumIdentBlocks;
 194         uint16_t BlockSize;
 195         uint16_t MinBlockEraseCycles;
 196         uint8_t  BitsPerCell;
 197         uint8_t  BlockCap;
 198 } __attribute__((packed));
 199
 200 struct cfi_intelext_regioninfo {
 201         uint16_t NumIdentPartitions;
 202         uint8_t  NumOpAllowed;
 203         uint8_t  NumOpAllowedSimProgMode;
 204         uint8_t  NumOpAllowedSimEraMode;
 205         uint8_t  NumBlockTypes;
 206         struct cfi_intelext_blockinfo BlockTypes[1];
 207 } __attribute__((packed));
 208
 209 struct cfi_intelext_programming_regioninfo {
 210         uint8_t  ProgRegShift;
 211         uint8_t  Reserved1;
 212         uint8_t  ControlValid;
 213         uint8_t  Reserved2;
 214         uint8_t  ControlInvalid;
 215         uint8_t  Reserved3;
 216 } __attribute__((packed));
 217
 218 /* Vendor-Specific PRI for AMD/Fujitsu Extended Command Set (0x0002) */
 219
 220 struct cfi_pri_amdstd {
 221         uint8_t  pri[3];
 222         uint8_t  MajorVersion;
 223         uint8_t  MinorVersion;
 224         uint8_t  SiliconRevision; /* bits 1-0: Address Sensitive Unlock */
 225         uint8_t  EraseSuspend;
 226         uint8_t  BlkProt;
 227         uint8_t  TmpBlkUnprotect;
 228         uint8_t  BlkProtUnprot;
 229         uint8_t  SimultaneousOps;
 230         uint8_t  BurstMode;
 231         uint8_t  PageMode;
 232         uint8_t  VppMin;
 233         uint8_t  VppMax;
 234         uint8_t  TopBottom;
 235 } __attribute__((packed));
 236
 237 /* Vendor-Specific PRI for Atmel chips (command set 0x0002) */
 238
 239 struct cfi_pri_atmel {
 240         uint8_t pri[3];
 241         uint8_t MajorVersion;
 242         uint8_t MinorVersion;
 243         uint8_t Features;
 244         uint8_t BottomBoot;
 245         uint8_t BurstMode;
 246         uint8_t PageMode;
 247 } __attribute__((packed));
 248
 249 struct cfi_pri_query {
 250         uint8_t  NumFields;
 251         uint32_t ProtField[1]; /* Not host ordered */
 252 } __attribute__((packed));
 253
 254 struct cfi_bri_query {
 255         uint8_t  PageModeReadCap;
 256         uint8_t  NumFields;
 257         uint32_t ConfField[1]; /* Not host ordered */
 258 } __attribute__((packed));
 259
 260 #define P_ID_NONE               0x0000
 261 #define P_ID_INTEL_EXT          0x0001
 262 #define P_ID_AMD_STD            0x0002
 263 #define P_ID_INTEL_STD          0x0003
 264 #define P_ID_AMD_EXT            0x0004
 265 #define P_ID_WINBOND            0x0006
 266 #define P_ID_ST_ADV             0x0020
 267 #define P_ID_MITSUBISHI_STD     0x0100
 268 #define P_ID_MITSUBISHI_EXT     0x0101
 269 #define P_ID_SST_PAGE           0x0102
 270 #define P_ID_SST_OLD            0x0701
 271 #define P_ID_INTEL_PERFORMANCE  0x0200
 272 #define P_ID_INTEL_DATA         0x0210
 273 #define P_ID_RESERVED           0xffff
 274
 275
 276 #define CFI_MODE_CFI    1
 277 #define CFI_MODE_JEDEC  0
 278
 279 struct cfi_private {
 280         uint16_t cmdset;
 281         void *cmdset_priv;
 282         int interleave;
 283         int device_type;
 284         int cfi_mode;           /* Are we a JEDEC device pretending to be CFI? */
 285         int addr_unlock1;
 286         int addr_unlock2;
 287         struct mtd_info *(*cmdset_setup)(struct map_info *);
 288         struct cfi_ident *cfiq; /* For now only one. We insist that all devs
 289                                   must be of the same type. */
 290         int mfr, id;
 291         int numchips;
 292         map_word sector_erase_cmd;
 293         unsigned long chipshift; /* Because they're of the same type */
 294         const char *im_name;     /* inter_module name for cmdset_setup */
 295         struct flchip chips[0];  /* per-chip data structure for each chip */
 296 };
 297
 298 /*
 299  * Returns the command address according to the given geometry.
 300  */
 301 static inline uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs,
 302                                 struct map_info *map, struct cfi_private *cfi)
 303 {
 304         unsigned bankwidth = map_bankwidth(map);
 305         unsigned interleave = cfi_interleave(cfi);
 306         unsigned type = cfi->device_type;
 307         uint32_t addr;
 308
 309         addr = (cmd_ofs * type) * interleave;
 310
 311         /* Modify the unlock address if we are in compatibility mode.
 312          * For 16bit devices on 8 bit busses
 313          * and 32bit devices on 16 bit busses
 314          * set the low bit of the alternating bit sequence of the address.
 315          */
 316         if (((type * interleave) > bankwidth) && ((cmd_ofs & 0xff) == 0xaa))
 317                 addr |= (type >> 1)*interleave;
 318
 319         return  addr;
 320 }
 321
 322 /*
 323  * Transforms the CFI command for the given geometry (bus width & interleave).
 324  * It looks too long to be inline, but in the common case it should almost all
 325  * get optimised away.
 326  */
 327 static inline map_word cfi_build_cmd(u_long cmd, struct map_info *map, struct cfi_private *cfi)
 328 {
 329         map_word val = { {0} };
 330         int wordwidth, words_per_bus, chip_mode, chips_per_word;
 331         unsigned long onecmd;
 332         int i;
 333
 334         /* We do it this way to give the compiler a fighting chance
 335            of optimising away all the crap for 'bankwidth' larger than
 336            an unsigned long, in the common case where that support is
 337            disabled */
 338         if (map_bankwidth_is_large(map)) {
 339                 wordwidth = sizeof(unsigned long);
 340                 words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
 341         } else {
 342                 wordwidth = map_bankwidth(map);
 343                 words_per_bus = 1;
 344         }
 345
 346         chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
 347         chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
 348
 349         /* First, determine what the bit-pattern should be for a single
 350            device, according to chip mode and endianness... */
 351         switch (chip_mode) {
 352         default: BUG();
 353         case 1:
 354                 onecmd = cmd;
 355                 break;
 356         case 2:
 357                 onecmd = cpu_to_cfi16(cmd);
 358                 break;
 359         case 4:
 360                 onecmd = cpu_to_cfi32(cmd);
 361                 break;
 362         }
 363
 364         /* Now replicate it across the size of an unsigned long, or
 365            just to the bus width as appropriate */
 366         switch (chips_per_word) {
 367         default: BUG();
 368 #if BITS_PER_LONG >= 64
 369         case 8:
 370                 onecmd |= (onecmd << (chip_mode * 32));
 371 #endif
 372         case 4:
 373                 onecmd |= (onecmd << (chip_mode * 16));
 374         case 2:
 375                 onecmd |= (onecmd << (chip_mode * 8));
 376         case 1:
 377                 ;
 378         }
 379
 380         /* And finally, for the multi-word case, replicate it
 381            in all words in the structure */
 382         for (i=0; i < words_per_bus; i++) {
 383                 val.x[i] = onecmd;
 384         }
 385
 386         return val;
 387 }
 388 #define CMD(x)  cfi_build_cmd((x), map, cfi)
 389
 390
 391 static inline unsigned long cfi_merge_status(map_word val, struct map_info *map,
 392                                            struct cfi_private *cfi)
 393 {
 394         int wordwidth, words_per_bus, chip_mode, chips_per_word;
 395         unsigned long onestat, res = 0;
 396         int i;
 397
 398         /* We do it this way to give the compiler a fighting chance
 399            of optimising away all the crap for 'bankwidth' larger than
 400            an unsigned long, in the common case where that support is
 401            disabled */
 402         if (map_bankwidth_is_large(map)) {
 403                 wordwidth = sizeof(unsigned long);
 404                 words_per_bus = (map_bankwidth(map)) / wordwidth; // i.e. normally 1
 405         } else {
 406                 wordwidth = map_bankwidth(map);
 407                 words_per_bus = 1;
 408         }
 409
 410         chip_mode = map_bankwidth(map) / cfi_interleave(cfi);
 411         chips_per_word = wordwidth * cfi_interleave(cfi) / map_bankwidth(map);
 412
 413         onestat = val.x[0];
 414         /* Or all status words together */
 415         for (i=1; i < words_per_bus; i++) {
 416                 onestat |= val.x[i];
 417         }
 418
 419         res = onestat;
 420         switch(chips_per_word) {
 421         default: BUG();
 422 #if BITS_PER_LONG >= 64
 423         case 8:
 424                 res |= (onestat >> (chip_mode * 32));
 425 #endif
 426         case 4:
 427                 res |= (onestat >> (chip_mode * 16));
 428         case 2:
 429                 res |= (onestat >> (chip_mode * 8));
 430         case 1:
 431                 ;
 432         }
 433
 434         /* Last, determine what the bit-pattern should be for a single
 435            device, according to chip mode and endianness... */
 436         switch (chip_mode) {
 437         case 1:
 438                 break;
 439         case 2:
 440                 res = cfi16_to_cpu(res);
 441                 break;
 442         case 4:
 443                 res = cfi32_to_cpu(res);
 444                 break;
 445         default: BUG();
 446         }
 447         return res;
 448 }
 449
 450 #define MERGESTATUS(x) cfi_merge_status((x), map, cfi)
 451
 452
 453 /*
 454  * Sends a CFI command to a bank of flash for the given geometry.
 455  *
 456  * Returns the offset in flash where the command was written.
 457  * If prev_val is non-null, it will be set to the value at the command address,
 458  * before the command was written.
 459  */
 460 static inline uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base,
 461                                 struct map_info *map, struct cfi_private *cfi,
 462                                 int type, map_word *prev_val)
 463 {
 464         map_word val;
 465         uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, map, cfi);
 466         val = cfi_build_cmd(cmd, map, cfi);
 467
 468         if (prev_val)
 469                 *prev_val = map_read(map, addr);
 470
 471         map_write(map, val, addr);
 472
 473         return addr - base;
 474 }
 475
 476 static inline uint8_t cfi_read_query(struct map_info *map, uint32_t addr)
 477 {
 478         map_word val = map_read(map, addr);
 479
 480         if (map_bankwidth_is_1(map)) {
 481                 return val.x[0];
 482         } else if (map_bankwidth_is_2(map)) {
 483                 return cfi16_to_cpu(val.x[0]);
 484         } else {
 485                 /* No point in a 64-bit byteswap since that would just be
 486                    swapping the responses from different chips, and we are
 487                    only interested in one chip (a representative sample) */
 488                 return cfi32_to_cpu(val.x[0]);
 489         }
 490 }
 491
 492 static inline uint16_t cfi_read_query16(struct map_info *map, uint32_t addr)
 493 {
 494         map_word val = map_read(map, addr);
 495
 496         if (map_bankwidth_is_1(map)) {
 497                 return val.x[0] & 0xff;
 498         } else if (map_bankwidth_is_2(map)) {
 499                 return cfi16_to_cpu(val.x[0]);
 500         } else {
 501                 /* No point in a 64-bit byteswap since that would just be
 502                    swapping the responses from different chips, and we are
 503                    only interested in one chip (a representative sample) */
 504                 return cfi32_to_cpu(val.x[0]);
 505         }
 506 }
 507
 508 static inline void cfi_udelay(int us)
 509 {
 510         if (us >= 1000) {
 511                 msleep((us+999)/1000);
 512         } else {
 513                 udelay(us);
 514                 cond_resched();
 515         }
 516 }
 517
 518 int __xipram cfi_qry_present(struct map_info *map, __u32 base,
 519                              struct cfi_private *cfi);
 520 int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
 521                              struct cfi_private *cfi);
 522 void __xipram cfi_qry_mode_off(uint32_t base, struct map_info *map,
 523                                struct cfi_private *cfi);
 524
 525 struct cfi_extquery *cfi_read_pri(struct map_info *map, uint16_t adr, uint16_t size,
 526                              const char* name);
 527 struct cfi_fixup {
 528         uint16_t mfr;
 529         uint16_t id;
 530         void (*fixup)(struct mtd_info *mtd);
 531 };
 532
 533 #define CFI_MFR_ANY             0xFFFF
 534 #define CFI_ID_ANY              0xFFFF
 535 #define CFI_MFR_CONTINUATION    0x007F
 536
 537 #define CFI_MFR_AMD             0x0001
 538 #define CFI_MFR_AMIC            0x0037
 539 #define CFI_MFR_ATMEL           0x001F
 540 #define CFI_MFR_EON             0x001C
 541 #define CFI_MFR_FUJITSU         0x0004
 542 #define CFI_MFR_HYUNDAI         0x00AD
 543 #define CFI_MFR_INTEL           0x0089
 544 #define CFI_MFR_MACRONIX        0x00C2
 545 #define CFI_MFR_NEC             0x0010
 546 #define CFI_MFR_PMC             0x009D
 547 #define CFI_MFR_SAMSUNG         0x00EC
 548 #define CFI_MFR_SHARP           0x00B0
 549 #define CFI_MFR_SST             0x00BF
 550 #define CFI_MFR_ST              0x0020 /* STMicroelectronics */
 551 #define CFI_MFR_TOSHIBA         0x0098
 552 #define CFI_MFR_WINBOND         0x00DA
 553
 554 void cfi_fixup(struct mtd_info *mtd, struct cfi_fixup* fixups);
 555
 556 typedef int (*varsize_frob_t)(struct map_info *map, struct flchip *chip,
 557                               unsigned long adr, int len, void *thunk);
 558
 559 int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
 560         loff_t ofs, size_t len, void *thunk);
 561
 562
 563 #endif /* __MTD_CFI_H__ */