include/linux/mtd/cfi.h

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