include/linux/ccp.h

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) driver
   3  *
   4  * Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
   5  *
   6  * Author: Tom Lendacky <thomas.lendacky@amd.com>
   7  * Author: Gary R Hook <gary.hook@amd.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __CCP_H__
  15 #define __CCP_H__
  16
  17 #include <linux/scatterlist.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/list.h>
  20 #include <crypto/aes.h>
  21 #include <crypto/sha.h>
  22
  23 struct ccp_device;
  24 struct ccp_cmd;
  25
  26 #if defined(CONFIG_CRYPTO_DEV_SP_CCP)
  27
  28 /**
  29  * ccp_present - check if a CCP device is present
  30  *
  31  * Returns zero if a CCP device is present, -ENODEV otherwise.
  32  */
  33 int ccp_present(void);
  34
  35 #define CCP_VSIZE 16
  36 #define CCP_VMASK               ((unsigned int)((1 << CCP_VSIZE) - 1))
  37 #define CCP_VERSION(v, r)       ((unsigned int)((v << CCP_VSIZE) \
  38                                                | (r & CCP_VMASK)))
  39
  40 /**
  41  * ccp_version - get the version of the CCP
  42  *
  43  * Returns a positive version number, or zero if no CCP
  44  */
  45 unsigned int ccp_version(void);
  46
  47 /**
  48  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  49  *
  50  * @cmd: ccp_cmd struct to be processed
  51  *
  52  * Refer to the ccp_cmd struct below for required fields.
  53  *
  54  * Queue a cmd to be processed by the CCP. If queueing the cmd
  55  * would exceed the defined length of the cmd queue the cmd will
  56  * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
  57  * result in a return code of -EBUSY.
  58  *
  59  * The callback routine specified in the ccp_cmd struct will be
  60  * called to notify the caller of completion (if the cmd was not
  61  * backlogged) or advancement out of the backlog. If the cmd has
  62  * advanced out of the backlog the "err" value of the callback
  63  * will be -EINPROGRESS. Any other "err" value during callback is
  64  * the result of the operation.
  65  *
  66  * The cmd has been successfully queued if:
  67  *   the return code is -EINPROGRESS or
  68  *   the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
  69  */
  70 int ccp_enqueue_cmd(struct ccp_cmd *cmd);
  71
  72 #else /* CONFIG_CRYPTO_DEV_CCP_SP_DEV is not enabled */
  73
  74 static inline int ccp_present(void)
  75 {
  76         return -ENODEV;
  77 }
  78
  79 static inline unsigned int ccp_version(void)
  80 {
  81         return 0;
  82 }
  83
  84 static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
  85 {
  86         return -ENODEV;
  87 }
  88
  89 #endif /* CONFIG_CRYPTO_DEV_SP_CCP */
  90
  91
  92 /***** AES engine *****/
  93 /**
  94  * ccp_aes_type - AES key size
  95  *
  96  * @CCP_AES_TYPE_128: 128-bit key
  97  * @CCP_AES_TYPE_192: 192-bit key
  98  * @CCP_AES_TYPE_256: 256-bit key
  99  */
 100 enum ccp_aes_type {
 101         CCP_AES_TYPE_128 = 0,
 102         CCP_AES_TYPE_192,
 103         CCP_AES_TYPE_256,
 104         CCP_AES_TYPE__LAST,
 105 };
 106
 107 /**
 108  * ccp_aes_mode - AES operation mode
 109  *
 110  * @CCP_AES_MODE_ECB: ECB mode
 111  * @CCP_AES_MODE_CBC: CBC mode
 112  * @CCP_AES_MODE_OFB: OFB mode
 113  * @CCP_AES_MODE_CFB: CFB mode
 114  * @CCP_AES_MODE_CTR: CTR mode
 115  * @CCP_AES_MODE_CMAC: CMAC mode
 116  */
 117 enum ccp_aes_mode {
 118         CCP_AES_MODE_ECB = 0,
 119         CCP_AES_MODE_CBC,
 120         CCP_AES_MODE_OFB,
 121         CCP_AES_MODE_CFB,
 122         CCP_AES_MODE_CTR,
 123         CCP_AES_MODE_CMAC,
 124         CCP_AES_MODE_GHASH,
 125         CCP_AES_MODE_GCTR,
 126         CCP_AES_MODE_GCM,
 127         CCP_AES_MODE_GMAC,
 128         CCP_AES_MODE__LAST,
 129 };
 130
 131 /**
 132  * ccp_aes_mode - AES operation mode
 133  *
 134  * @CCP_AES_ACTION_DECRYPT: AES decrypt operation
 135  * @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
 136  */
 137 enum ccp_aes_action {
 138         CCP_AES_ACTION_DECRYPT = 0,
 139         CCP_AES_ACTION_ENCRYPT,
 140         CCP_AES_ACTION__LAST,
 141 };
 142 /* Overloaded field */
 143 #define CCP_AES_GHASHAAD        CCP_AES_ACTION_DECRYPT
 144 #define CCP_AES_GHASHFINAL      CCP_AES_ACTION_ENCRYPT
 145
 146 /**
 147  * struct ccp_aes_engine - CCP AES operation
 148  * @type: AES operation key size
 149  * @mode: AES operation mode
 150  * @action: AES operation (decrypt/encrypt)
 151  * @key: key to be used for this AES operation
 152  * @key_len: length in bytes of key
 153  * @iv: IV to be used for this AES operation
 154  * @iv_len: length in bytes of iv
 155  * @src: data to be used for this operation
 156  * @dst: data produced by this operation
 157  * @src_len: length in bytes of data used for this operation
 158  * @cmac_final: indicates final operation when running in CMAC mode
 159  * @cmac_key: K1/K2 key used in final CMAC operation
 160  * @cmac_key_len: length in bytes of cmac_key
 161  *
 162  * Variables required to be set when calling ccp_enqueue_cmd():
 163  *   - type, mode, action, key, key_len, src, dst, src_len
 164  *   - iv, iv_len for any mode other than ECB
 165  *   - cmac_final for CMAC mode
 166  *   - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
 167  *
 168  * The iv variable is used as both input and output. On completion of the
 169  * AES operation the new IV overwrites the old IV.
 170  */
 171 struct ccp_aes_engine {
 172         enum ccp_aes_type type;
 173         enum ccp_aes_mode mode;
 174         enum ccp_aes_action action;
 175
 176         struct scatterlist *key;
 177         u32 key_len;            /* In bytes */
 178
 179         struct scatterlist *iv;
 180         u32 iv_len;             /* In bytes */
 181
 182         struct scatterlist *src, *dst;
 183         u64 src_len;            /* In bytes */
 184
 185         u32 cmac_final;         /* Indicates final cmac cmd */
 186         struct scatterlist *cmac_key;   /* K1/K2 cmac key required for
 187                                          * final cmac cmd */
 188         u32 cmac_key_len;       /* In bytes */
 189
 190         u32 aad_len;            /* In bytes */
 191 };
 192
 193 /***** XTS-AES engine *****/
 194 /**
 195  * ccp_xts_aes_unit_size - XTS unit size
 196  *
 197  * @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
 198  * @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
 199  * @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
 200  * @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
 201  * @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
 202  */
 203 enum ccp_xts_aes_unit_size {
 204         CCP_XTS_AES_UNIT_SIZE_16 = 0,
 205         CCP_XTS_AES_UNIT_SIZE_512,
 206         CCP_XTS_AES_UNIT_SIZE_1024,
 207         CCP_XTS_AES_UNIT_SIZE_2048,
 208         CCP_XTS_AES_UNIT_SIZE_4096,
 209         CCP_XTS_AES_UNIT_SIZE__LAST,
 210 };
 211
 212 /**
 213  * struct ccp_xts_aes_engine - CCP XTS AES operation
 214  * @action: AES operation (decrypt/encrypt)
 215  * @unit_size: unit size of the XTS operation
 216  * @key: key to be used for this XTS AES operation
 217  * @key_len: length in bytes of key
 218  * @iv: IV to be used for this XTS AES operation
 219  * @iv_len: length in bytes of iv
 220  * @src: data to be used for this operation
 221  * @dst: data produced by this operation
 222  * @src_len: length in bytes of data used for this operation
 223  * @final: indicates final XTS operation
 224  *
 225  * Variables required to be set when calling ccp_enqueue_cmd():
 226  *   - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
 227  *
 228  * The iv variable is used as both input and output. On completion of the
 229  * AES operation the new IV overwrites the old IV.
 230  */
 231 struct ccp_xts_aes_engine {
 232         enum ccp_aes_type type;
 233         enum ccp_aes_action action;
 234         enum ccp_xts_aes_unit_size unit_size;
 235
 236         struct scatterlist *key;
 237         u32 key_len;            /* In bytes */
 238
 239         struct scatterlist *iv;
 240         u32 iv_len;             /* In bytes */
 241
 242         struct scatterlist *src, *dst;
 243         u64 src_len;            /* In bytes */
 244
 245         u32 final;
 246 };
 247
 248 /***** SHA engine *****/
 249 /**
 250  * ccp_sha_type - type of SHA operation
 251  *
 252  * @CCP_SHA_TYPE_1: SHA-1 operation
 253  * @CCP_SHA_TYPE_224: SHA-224 operation
 254  * @CCP_SHA_TYPE_256: SHA-256 operation
 255  */
 256 enum ccp_sha_type {
 257         CCP_SHA_TYPE_1 = 1,
 258         CCP_SHA_TYPE_224,
 259         CCP_SHA_TYPE_256,
 260         CCP_SHA_TYPE_384,
 261         CCP_SHA_TYPE_512,
 262         CCP_SHA_TYPE__LAST,
 263 };
 264
 265 /**
 266  * struct ccp_sha_engine - CCP SHA operation
 267  * @type: Type of SHA operation
 268  * @ctx: current hash value
 269  * @ctx_len: length in bytes of hash value
 270  * @src: data to be used for this operation
 271  * @src_len: length in bytes of data used for this operation
 272  * @opad: data to be used for final HMAC operation
 273  * @opad_len: length in bytes of data used for final HMAC operation
 274  * @first: indicates first SHA operation
 275  * @final: indicates final SHA operation
 276  * @msg_bits: total length of the message in bits used in final SHA operation
 277  *
 278  * Variables required to be set when calling ccp_enqueue_cmd():
 279  *   - type, ctx, ctx_len, src, src_len, final
 280  *   - msg_bits if final is non-zero
 281  *
 282  * The ctx variable is used as both input and output. On completion of the
 283  * SHA operation the new hash value overwrites the old hash value.
 284  */
 285 struct ccp_sha_engine {
 286         enum ccp_sha_type type;
 287
 288         struct scatterlist *ctx;
 289         u32 ctx_len;            /* In bytes */
 290
 291         struct scatterlist *src;
 292         u64 src_len;            /* In bytes */
 293
 294         struct scatterlist *opad;
 295         u32 opad_len;           /* In bytes */
 296
 297         u32 first;              /* Indicates first sha cmd */
 298         u32 final;              /* Indicates final sha cmd */
 299         u64 msg_bits;           /* Message length in bits required for
 300                                  * final sha cmd */
 301 };
 302
 303 /***** 3DES engine *****/
 304 enum ccp_des3_mode {
 305         CCP_DES3_MODE_ECB = 0,
 306         CCP_DES3_MODE_CBC,
 307         CCP_DES3_MODE_CFB,
 308         CCP_DES3_MODE__LAST,
 309 };
 310
 311 enum ccp_des3_type {
 312         CCP_DES3_TYPE_168 = 1,
 313         CCP_DES3_TYPE__LAST,
 314         };
 315
 316 enum ccp_des3_action {
 317         CCP_DES3_ACTION_DECRYPT = 0,
 318         CCP_DES3_ACTION_ENCRYPT,
 319         CCP_DES3_ACTION__LAST,
 320 };
 321
 322 /**
 323  * struct ccp_des3_engine - CCP SHA operation
 324  * @type: Type of 3DES operation
 325  * @mode: cipher mode
 326  * @action: 3DES operation (decrypt/encrypt)
 327  * @key: key to be used for this 3DES operation
 328  * @key_len: length of key (in bytes)
 329  * @iv: IV to be used for this AES operation
 330  * @iv_len: length in bytes of iv
 331  * @src: input data to be used for this operation
 332  * @src_len: length of input data used for this operation (in bytes)
 333  * @dst: output data produced by this operation
 334  *
 335  * Variables required to be set when calling ccp_enqueue_cmd():
 336  *   - type, mode, action, key, key_len, src, dst, src_len
 337  *   - iv, iv_len for any mode other than ECB
 338  *
 339  * The iv variable is used as both input and output. On completion of the
 340  * 3DES operation the new IV overwrites the old IV.
 341  */
 342 struct ccp_des3_engine {
 343         enum ccp_des3_type type;
 344         enum ccp_des3_mode mode;
 345         enum ccp_des3_action action;
 346
 347         struct scatterlist *key;
 348         u32 key_len;        /* In bytes */
 349
 350         struct scatterlist *iv;
 351         u32 iv_len;          /* In bytes */
 352
 353         struct scatterlist *src, *dst;
 354         u64 src_len;        /* In bytes */
 355 };
 356
 357 /***** RSA engine *****/
 358 /**
 359  * struct ccp_rsa_engine - CCP RSA operation
 360  * @key_size: length in bits of RSA key
 361  * @exp: RSA exponent
 362  * @exp_len: length in bytes of exponent
 363  * @mod: RSA modulus
 364  * @mod_len: length in bytes of modulus
 365  * @src: data to be used for this operation
 366  * @dst: data produced by this operation
 367  * @src_len: length in bytes of data used for this operation
 368  *
 369  * Variables required to be set when calling ccp_enqueue_cmd():
 370  *   - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
 371  */
 372 struct ccp_rsa_engine {
 373         u32 key_size;           /* In bits */
 374
 375         struct scatterlist *exp;
 376         u32 exp_len;            /* In bytes */
 377
 378         struct scatterlist *mod;
 379         u32 mod_len;            /* In bytes */
 380
 381         struct scatterlist *src, *dst;
 382         u32 src_len;            /* In bytes */
 383 };
 384
 385 /***** Passthru engine *****/
 386 /**
 387  * ccp_passthru_bitwise - type of bitwise passthru operation
 388  *
 389  * @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
 390  * @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
 391  * @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
 392  * @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
 393  * @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
 394  */
 395 enum ccp_passthru_bitwise {
 396         CCP_PASSTHRU_BITWISE_NOOP = 0,
 397         CCP_PASSTHRU_BITWISE_AND,
 398         CCP_PASSTHRU_BITWISE_OR,
 399         CCP_PASSTHRU_BITWISE_XOR,
 400         CCP_PASSTHRU_BITWISE_MASK,
 401         CCP_PASSTHRU_BITWISE__LAST,
 402 };
 403
 404 /**
 405  * ccp_passthru_byteswap - type of byteswap passthru operation
 406  *
 407  * @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
 408  * @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
 409  * @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
 410  */
 411 enum ccp_passthru_byteswap {
 412         CCP_PASSTHRU_BYTESWAP_NOOP = 0,
 413         CCP_PASSTHRU_BYTESWAP_32BIT,
 414         CCP_PASSTHRU_BYTESWAP_256BIT,
 415         CCP_PASSTHRU_BYTESWAP__LAST,
 416 };
 417
 418 /**
 419  * struct ccp_passthru_engine - CCP pass-through operation
 420  * @bit_mod: bitwise operation to perform
 421  * @byte_swap: byteswap operation to perform
 422  * @mask: mask to be applied to data
 423  * @mask_len: length in bytes of mask
 424  * @src: data to be used for this operation
 425  * @dst: data produced by this operation
 426  * @src_len: length in bytes of data used for this operation
 427  * @final: indicate final pass-through operation
 428  *
 429  * Variables required to be set when calling ccp_enqueue_cmd():
 430  *   - bit_mod, byte_swap, src, dst, src_len
 431  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 432  */
 433 struct ccp_passthru_engine {
 434         enum ccp_passthru_bitwise bit_mod;
 435         enum ccp_passthru_byteswap byte_swap;
 436
 437         struct scatterlist *mask;
 438         u32 mask_len;           /* In bytes */
 439
 440         struct scatterlist *src, *dst;
 441         u64 src_len;            /* In bytes */
 442
 443         u32 final;
 444 };
 445
 446 /**
 447  * struct ccp_passthru_nomap_engine - CCP pass-through operation
 448  *   without performing DMA mapping
 449  * @bit_mod: bitwise operation to perform
 450  * @byte_swap: byteswap operation to perform
 451  * @mask: mask to be applied to data
 452  * @mask_len: length in bytes of mask
 453  * @src: data to be used for this operation
 454  * @dst: data produced by this operation
 455  * @src_len: length in bytes of data used for this operation
 456  * @final: indicate final pass-through operation
 457  *
 458  * Variables required to be set when calling ccp_enqueue_cmd():
 459  *   - bit_mod, byte_swap, src, dst, src_len
 460  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 461  */
 462 struct ccp_passthru_nomap_engine {
 463         enum ccp_passthru_bitwise bit_mod;
 464         enum ccp_passthru_byteswap byte_swap;
 465
 466         dma_addr_t mask;
 467         u32 mask_len;           /* In bytes */
 468
 469         dma_addr_t src_dma, dst_dma;
 470         u64 src_len;            /* In bytes */
 471
 472         u32 final;
 473 };
 474
 475 /***** ECC engine *****/
 476 #define CCP_ECC_MODULUS_BYTES   48      /* 384-bits */
 477 #define CCP_ECC_MAX_OPERANDS    6
 478 #define CCP_ECC_MAX_OUTPUTS     3
 479
 480 /**
 481  * ccp_ecc_function - type of ECC function
 482  *
 483  * @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
 484  * @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
 485  * @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
 486  * @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
 487  * @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
 488  * @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
 489  */
 490 enum ccp_ecc_function {
 491         CCP_ECC_FUNCTION_MMUL_384BIT = 0,
 492         CCP_ECC_FUNCTION_MADD_384BIT,
 493         CCP_ECC_FUNCTION_MINV_384BIT,
 494         CCP_ECC_FUNCTION_PADD_384BIT,
 495         CCP_ECC_FUNCTION_PMUL_384BIT,
 496         CCP_ECC_FUNCTION_PDBL_384BIT,
 497 };
 498
 499 /**
 500  * struct ccp_ecc_modular_math - CCP ECC modular math parameters
 501  * @operand_1: first operand for the modular math operation
 502  * @operand_1_len: length of the first operand
 503  * @operand_2: second operand for the modular math operation
 504  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 505  * @operand_2_len: length of the second operand
 506  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 507  * @result: result of the modular math operation
 508  * @result_len: length of the supplied result buffer
 509  */
 510 struct ccp_ecc_modular_math {
 511         struct scatterlist *operand_1;
 512         unsigned int operand_1_len;     /* In bytes */
 513
 514         struct scatterlist *operand_2;
 515         unsigned int operand_2_len;     /* In bytes */
 516
 517         struct scatterlist *result;
 518         unsigned int result_len;        /* In bytes */
 519 };
 520
 521 /**
 522  * struct ccp_ecc_point - CCP ECC point definition
 523  * @x: the x coordinate of the ECC point
 524  * @x_len: the length of the x coordinate
 525  * @y: the y coordinate of the ECC point
 526  * @y_len: the length of the y coordinate
 527  */
 528 struct ccp_ecc_point {
 529         struct scatterlist *x;
 530         unsigned int x_len;     /* In bytes */
 531
 532         struct scatterlist *y;
 533         unsigned int y_len;     /* In bytes */
 534 };
 535
 536 /**
 537  * struct ccp_ecc_point_math - CCP ECC point math parameters
 538  * @point_1: the first point of the ECC point math operation
 539  * @point_2: the second point of the ECC point math operation
 540  *           (only used for CCP_ECC_FUNCTION_PADD_384BIT)
 541  * @domain_a: the a parameter of the ECC curve
 542  * @domain_a_len: the length of the a parameter
 543  * @scalar: the scalar parameter for the point match operation
 544  *          (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 545  * @scalar_len: the length of the scalar parameter
 546  *              (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 547  * @result: the point resulting from the point math operation
 548  */
 549 struct ccp_ecc_point_math {
 550         struct ccp_ecc_point point_1;
 551         struct ccp_ecc_point point_2;
 552
 553         struct scatterlist *domain_a;
 554         unsigned int domain_a_len;      /* In bytes */
 555
 556         struct scatterlist *scalar;
 557         unsigned int scalar_len;        /* In bytes */
 558
 559         struct ccp_ecc_point result;
 560 };
 561
 562 /**
 563  * struct ccp_ecc_engine - CCP ECC operation
 564  * @function: ECC function to perform
 565  * @mod: ECC modulus
 566  * @mod_len: length in bytes of modulus
 567  * @mm: module math parameters
 568  * @pm: point math parameters
 569  * @ecc_result: result of the ECC operation
 570  *
 571  * Variables required to be set when calling ccp_enqueue_cmd():
 572  *   - function, mod, mod_len
 573  *   - operand, operand_len, operand_count, output, output_len, output_count
 574  *   - ecc_result
 575  */
 576 struct ccp_ecc_engine {
 577         enum ccp_ecc_function function;
 578
 579         struct scatterlist *mod;
 580         u32 mod_len;            /* In bytes */
 581
 582         union {
 583                 struct ccp_ecc_modular_math mm;
 584                 struct ccp_ecc_point_math pm;
 585         } u;
 586
 587         u16 ecc_result;
 588 };
 589
 590
 591 /**
 592  * ccp_engine - CCP operation identifiers
 593  *
 594  * @CCP_ENGINE_AES: AES operation
 595  * @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
 596  * @CCP_ENGINE_RSVD1: unused
 597  * @CCP_ENGINE_SHA: SHA operation
 598  * @CCP_ENGINE_RSA: RSA operation
 599  * @CCP_ENGINE_PASSTHRU: pass-through operation
 600  * @CCP_ENGINE_ZLIB_DECOMPRESS: unused
 601  * @CCP_ENGINE_ECC: ECC operation
 602  */
 603 enum ccp_engine {
 604         CCP_ENGINE_AES = 0,
 605         CCP_ENGINE_XTS_AES_128,
 606         CCP_ENGINE_DES3,
 607         CCP_ENGINE_SHA,
 608         CCP_ENGINE_RSA,
 609         CCP_ENGINE_PASSTHRU,
 610         CCP_ENGINE_ZLIB_DECOMPRESS,
 611         CCP_ENGINE_ECC,
 612         CCP_ENGINE__LAST,
 613 };
 614
 615 /* Flag values for flags member of ccp_cmd */
 616 #define CCP_CMD_MAY_BACKLOG             0x00000001
 617 #define CCP_CMD_PASSTHRU_NO_DMA_MAP     0x00000002
 618
 619 /**
 620  * struct ccp_cmd - CCP operation request
 621  * @entry: list element (ccp driver use only)
 622  * @work: work element used for callbacks (ccp driver use only)
 623  * @ccp: CCP device to be run on
 624  * @ret: operation return code (ccp driver use only)
 625  * @flags: cmd processing flags
 626  * @engine: CCP operation to perform
 627  * @engine_error: CCP engine return code
 628  * @u: engine specific structures, refer to specific engine struct below
 629  * @callback: operation completion callback function
 630  * @data: parameter value to be supplied to the callback function
 631  *
 632  * Variables required to be set when calling ccp_enqueue_cmd():
 633  *   - engine, callback
 634  *   - See the operation structures below for what is required for each
 635  *     operation.
 636  */
 637 struct ccp_cmd {
 638         /* The list_head, work_struct, ccp and ret variables are for use
 639          * by the CCP driver only.
 640          */
 641         struct list_head entry;
 642         struct work_struct work;
 643         struct ccp_device *ccp;
 644         int ret;
 645
 646         u32 flags;
 647
 648         enum ccp_engine engine;
 649         u32 engine_error;
 650
 651         union {
 652                 struct ccp_aes_engine aes;
 653                 struct ccp_xts_aes_engine xts;
 654                 struct ccp_des3_engine des3;
 655                 struct ccp_sha_engine sha;
 656                 struct ccp_rsa_engine rsa;
 657                 struct ccp_passthru_engine passthru;
 658                 struct ccp_passthru_nomap_engine passthru_nomap;
 659                 struct ccp_ecc_engine ecc;
 660         } u;
 661
 662         /* Completion callback support */
 663         void (*callback)(void *data, int err);
 664         void *data;
 665 };
 666
 667 #endif