include/linux/ccp.h

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) driver
   3  *
   4  * Copyright (C) 2013,2016 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
  24 struct ccp_device;
  25 struct ccp_cmd;
  26
  27 #if defined(CONFIG_CRYPTO_DEV_CCP_DD) || \
  28         defined(CONFIG_CRYPTO_DEV_CCP_DD_MODULE)
  29
  30 /**
  31  * ccp_present - check if a CCP device is present
  32  *
  33  * Returns zero if a CCP device is present, -ENODEV otherwise.
  34  */
  35 int ccp_present(void);
  36
  37 #define CCP_VSIZE 16
  38 #define CCP_VMASK               ((unsigned int)((1 << CCP_VSIZE) - 1))
  39 #define CCP_VERSION(v, r)       ((unsigned int)((v << CCP_VSIZE) \
  40                                                | (r & CCP_VMASK)))
  41
  42 /**
  43  * ccp_version - get the version of the CCP
  44  *
  45  * Returns a positive version number, or zero if no CCP
  46  */
  47 unsigned int ccp_version(void);
  48
  49 /**
  50  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  51  *
  52  * @cmd: ccp_cmd struct to be processed
  53  *
  54  * Refer to the ccp_cmd struct below for required fields.
  55  *
  56  * Queue a cmd to be processed by the CCP. If queueing the cmd
  57  * would exceed the defined length of the cmd queue the cmd will
  58  * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
  59  * result in a return code of -EBUSY.
  60  *
  61  * The callback routine specified in the ccp_cmd struct will be
  62  * called to notify the caller of completion (if the cmd was not
  63  * backlogged) or advancement out of the backlog. If the cmd has
  64  * advanced out of the backlog the "err" value of the callback
  65  * will be -EINPROGRESS. Any other "err" value during callback is
  66  * the result of the operation.
  67  *
  68  * The cmd has been successfully queued if:
  69  *   the return code is -EINPROGRESS or
  70  *   the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
  71  */
  72 int ccp_enqueue_cmd(struct ccp_cmd *cmd);
  73
  74 #else /* CONFIG_CRYPTO_DEV_CCP_DD is not enabled */
  75
  76 static inline int ccp_present(void)
  77 {
  78         return -ENODEV;
  79 }
  80
  81 static inline unsigned int ccp_version(void)
  82 {
  83         return 0;
  84 }
  85
  86 static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
  87 {
  88         return -ENODEV;
  89 }
  90
  91 #endif /* CONFIG_CRYPTO_DEV_CCP_DD */
  92
  93
  94 /***** AES engine *****/
  95 /**
  96  * ccp_aes_type - AES key size
  97  *
  98  * @CCP_AES_TYPE_128: 128-bit key
  99  * @CCP_AES_TYPE_192: 192-bit key
 100  * @CCP_AES_TYPE_256: 256-bit key
 101  */
 102 enum ccp_aes_type {
 103         CCP_AES_TYPE_128 = 0,
 104         CCP_AES_TYPE_192,
 105         CCP_AES_TYPE_256,
 106         CCP_AES_TYPE__LAST,
 107 };
 108
 109 /**
 110  * ccp_aes_mode - AES operation mode
 111  *
 112  * @CCP_AES_MODE_ECB: ECB mode
 113  * @CCP_AES_MODE_CBC: CBC mode
 114  * @CCP_AES_MODE_OFB: OFB mode
 115  * @CCP_AES_MODE_CFB: CFB mode
 116  * @CCP_AES_MODE_CTR: CTR mode
 117  * @CCP_AES_MODE_CMAC: CMAC mode
 118  */
 119 enum ccp_aes_mode {
 120         CCP_AES_MODE_ECB = 0,
 121         CCP_AES_MODE_CBC,
 122         CCP_AES_MODE_OFB,
 123         CCP_AES_MODE_CFB,
 124         CCP_AES_MODE_CTR,
 125         CCP_AES_MODE_CMAC,
 126         CCP_AES_MODE_GHASH,
 127         CCP_AES_MODE_GCTR,
 128         CCP_AES_MODE_GCM,
 129         CCP_AES_MODE_GMAC,
 130         CCP_AES_MODE__LAST,
 131 };
 132
 133 /**
 134  * ccp_aes_mode - AES operation mode
 135  *
 136  * @CCP_AES_ACTION_DECRYPT: AES decrypt operation
 137  * @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
 138  */
 139 enum ccp_aes_action {
 140         CCP_AES_ACTION_DECRYPT = 0,
 141         CCP_AES_ACTION_ENCRYPT,
 142         CCP_AES_ACTION__LAST,
 143 };
 144 /* Overloaded field */
 145 #define CCP_AES_GHASHAAD        CCP_AES_ACTION_DECRYPT
 146 #define CCP_AES_GHASHFINAL      CCP_AES_ACTION_ENCRYPT
 147
 148 /**
 149  * struct ccp_aes_engine - CCP AES operation
 150  * @type: AES operation key size
 151  * @mode: AES operation mode
 152  * @action: AES operation (decrypt/encrypt)
 153  * @key: key to be used for this AES operation
 154  * @key_len: length in bytes of key
 155  * @iv: IV to be used for this AES operation
 156  * @iv_len: length in bytes of iv
 157  * @src: data to be used for this operation
 158  * @dst: data produced by this operation
 159  * @src_len: length in bytes of data used for this operation
 160  * @cmac_final: indicates final operation when running in CMAC mode
 161  * @cmac_key: K1/K2 key used in final CMAC operation
 162  * @cmac_key_len: length in bytes of cmac_key
 163  *
 164  * Variables required to be set when calling ccp_enqueue_cmd():
 165  *   - type, mode, action, key, key_len, src, dst, src_len
 166  *   - iv, iv_len for any mode other than ECB
 167  *   - cmac_final for CMAC mode
 168  *   - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
 169  *
 170  * The iv variable is used as both input and output. On completion of the
 171  * AES operation the new IV overwrites the old IV.
 172  */
 173 struct ccp_aes_engine {
 174         enum ccp_aes_type type;
 175         enum ccp_aes_mode mode;
 176         enum ccp_aes_action action;
 177
 178         struct scatterlist *key;
 179         u32 key_len;            /* In bytes */
 180
 181         struct scatterlist *iv;
 182         u32 iv_len;             /* In bytes */
 183
 184         struct scatterlist *src, *dst;
 185         u64 src_len;            /* In bytes */
 186
 187         u32 cmac_final;         /* Indicates final cmac cmd */
 188         struct scatterlist *cmac_key;   /* K1/K2 cmac key required for
 189                                          * final cmac cmd */
 190         u32 cmac_key_len;       /* In bytes */
 191
 192         u32 aad_len;            /* In bytes */
 193 };
 194
 195 /***** XTS-AES engine *****/
 196 /**
 197  * ccp_xts_aes_unit_size - XTS unit size
 198  *
 199  * @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
 200  * @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
 201  * @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
 202  * @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
 203  * @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
 204  */
 205 enum ccp_xts_aes_unit_size {
 206         CCP_XTS_AES_UNIT_SIZE_16 = 0,
 207         CCP_XTS_AES_UNIT_SIZE_512,
 208         CCP_XTS_AES_UNIT_SIZE_1024,
 209         CCP_XTS_AES_UNIT_SIZE_2048,
 210         CCP_XTS_AES_UNIT_SIZE_4096,
 211         CCP_XTS_AES_UNIT_SIZE__LAST,
 212 };
 213
 214 /**
 215  * struct ccp_xts_aes_engine - CCP XTS AES operation
 216  * @action: AES operation (decrypt/encrypt)
 217  * @unit_size: unit size of the XTS operation
 218  * @key: key to be used for this XTS AES operation
 219  * @key_len: length in bytes of key
 220  * @iv: IV to be used for this XTS AES operation
 221  * @iv_len: length in bytes of iv
 222  * @src: data to be used for this operation
 223  * @dst: data produced by this operation
 224  * @src_len: length in bytes of data used for this operation
 225  * @final: indicates final XTS operation
 226  *
 227  * Variables required to be set when calling ccp_enqueue_cmd():
 228  *   - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
 229  *
 230  * The iv variable is used as both input and output. On completion of the
 231  * AES operation the new IV overwrites the old IV.
 232  */
 233 struct ccp_xts_aes_engine {
 234         enum ccp_aes_action action;
 235         enum ccp_xts_aes_unit_size unit_size;
 236
 237         struct scatterlist *key;
 238         u32 key_len;            /* In bytes */
 239
 240         struct scatterlist *iv;
 241         u32 iv_len;             /* In bytes */
 242
 243         struct scatterlist *src, *dst;
 244         u64 src_len;            /* In bytes */
 245
 246         u32 final;
 247 };
 248
 249 /***** SHA engine *****/
 250 /**
 251  * ccp_sha_type - type of SHA operation
 252  *
 253  * @CCP_SHA_TYPE_1: SHA-1 operation
 254  * @CCP_SHA_TYPE_224: SHA-224 operation
 255  * @CCP_SHA_TYPE_256: SHA-256 operation
 256  */
 257 enum ccp_sha_type {
 258         CCP_SHA_TYPE_1 = 1,
 259         CCP_SHA_TYPE_224,
 260         CCP_SHA_TYPE_256,
 261         CCP_SHA_TYPE_384,
 262         CCP_SHA_TYPE_512,
 263         CCP_SHA_TYPE__LAST,
 264 };
 265
 266 /**
 267  * struct ccp_sha_engine - CCP SHA operation
 268  * @type: Type of SHA operation
 269  * @ctx: current hash value
 270  * @ctx_len: length in bytes of hash value
 271  * @src: data to be used for this operation
 272  * @src_len: length in bytes of data used for this operation
 273  * @opad: data to be used for final HMAC operation
 274  * @opad_len: length in bytes of data used for final HMAC operation
 275  * @first: indicates first SHA operation
 276  * @final: indicates final SHA operation
 277  * @msg_bits: total length of the message in bits used in final SHA operation
 278  *
 279  * Variables required to be set when calling ccp_enqueue_cmd():
 280  *   - type, ctx, ctx_len, src, src_len, final
 281  *   - msg_bits if final is non-zero
 282  *
 283  * The ctx variable is used as both input and output. On completion of the
 284  * SHA operation the new hash value overwrites the old hash value.
 285  */
 286 struct ccp_sha_engine {
 287         enum ccp_sha_type type;
 288
 289         struct scatterlist *ctx;
 290         u32 ctx_len;            /* In bytes */
 291
 292         struct scatterlist *src;
 293         u64 src_len;            /* In bytes */
 294
 295         struct scatterlist *opad;
 296         u32 opad_len;           /* In bytes */
 297
 298         u32 first;              /* Indicates first sha cmd */
 299         u32 final;              /* Indicates final sha cmd */
 300         u64 msg_bits;           /* Message length in bits required for
 301                                  * final sha cmd */
 302 };
 303
 304 /***** 3DES engine *****/
 305 enum ccp_des3_mode {
 306         CCP_DES3_MODE_ECB = 0,
 307         CCP_DES3_MODE_CBC,
 308         CCP_DES3_MODE_CFB,
 309         CCP_DES3_MODE__LAST,
 310 };
 311
 312 enum ccp_des3_type {
 313         CCP_DES3_TYPE_168 = 1,
 314         CCP_DES3_TYPE__LAST,
 315         };
 316
 317 enum ccp_des3_action {
 318         CCP_DES3_ACTION_DECRYPT = 0,
 319         CCP_DES3_ACTION_ENCRYPT,
 320         CCP_DES3_ACTION__LAST,
 321 };
 322
 323 /**
 324  * struct ccp_des3_engine - CCP SHA operation
 325  * @type: Type of 3DES operation
 326  * @mode: cipher mode
 327  * @action: 3DES operation (decrypt/encrypt)
 328  * @key: key to be used for this 3DES operation
 329  * @key_len: length of key (in bytes)
 330  * @iv: IV to be used for this AES operation
 331  * @iv_len: length in bytes of iv
 332  * @src: input data to be used for this operation
 333  * @src_len: length of input data used for this operation (in bytes)
 334  * @dst: output data produced by this operation
 335  *
 336  * Variables required to be set when calling ccp_enqueue_cmd():
 337  *   - type, mode, action, key, key_len, src, dst, src_len
 338  *   - iv, iv_len for any mode other than ECB
 339  *
 340  * The iv variable is used as both input and output. On completion of the
 341  * 3DES operation the new IV overwrites the old IV.
 342  */
 343 struct ccp_des3_engine {
 344         enum ccp_des3_type type;
 345         enum ccp_des3_mode mode;
 346         enum ccp_des3_action action;
 347
 348         struct scatterlist *key;
 349         u32 key_len;        /* In bytes */
 350
 351         struct scatterlist *iv;
 352         u32 iv_len;          /* In bytes */
 353
 354         struct scatterlist *src, *dst;
 355         u64 src_len;        /* In bytes */
 356 };
 357
 358 /***** RSA engine *****/
 359 /**
 360  * struct ccp_rsa_engine - CCP RSA operation
 361  * @key_size: length in bits of RSA key
 362  * @exp: RSA exponent
 363  * @exp_len: length in bytes of exponent
 364  * @mod: RSA modulus
 365  * @mod_len: length in bytes of modulus
 366  * @src: data to be used for this operation
 367  * @dst: data produced by this operation
 368  * @src_len: length in bytes of data used for this operation
 369  *
 370  * Variables required to be set when calling ccp_enqueue_cmd():
 371  *   - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
 372  */
 373 struct ccp_rsa_engine {
 374         u32 key_size;           /* In bits */
 375
 376         struct scatterlist *exp;
 377         u32 exp_len;            /* In bytes */
 378
 379         struct scatterlist *mod;
 380         u32 mod_len;            /* In bytes */
 381
 382         struct scatterlist *src, *dst;
 383         u32 src_len;            /* In bytes */
 384 };
 385
 386 /***** Passthru engine *****/
 387 /**
 388  * ccp_passthru_bitwise - type of bitwise passthru operation
 389  *
 390  * @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
 391  * @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
 392  * @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
 393  * @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
 394  * @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
 395  */
 396 enum ccp_passthru_bitwise {
 397         CCP_PASSTHRU_BITWISE_NOOP = 0,
 398         CCP_PASSTHRU_BITWISE_AND,
 399         CCP_PASSTHRU_BITWISE_OR,
 400         CCP_PASSTHRU_BITWISE_XOR,
 401         CCP_PASSTHRU_BITWISE_MASK,
 402         CCP_PASSTHRU_BITWISE__LAST,
 403 };
 404
 405 /**
 406  * ccp_passthru_byteswap - type of byteswap passthru operation
 407  *
 408  * @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
 409  * @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
 410  * @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
 411  */
 412 enum ccp_passthru_byteswap {
 413         CCP_PASSTHRU_BYTESWAP_NOOP = 0,
 414         CCP_PASSTHRU_BYTESWAP_32BIT,
 415         CCP_PASSTHRU_BYTESWAP_256BIT,
 416         CCP_PASSTHRU_BYTESWAP__LAST,
 417 };
 418
 419 /**
 420  * struct ccp_passthru_engine - CCP pass-through operation
 421  * @bit_mod: bitwise operation to perform
 422  * @byte_swap: byteswap operation to perform
 423  * @mask: mask to be applied to data
 424  * @mask_len: length in bytes of mask
 425  * @src: data to be used for this operation
 426  * @dst: data produced by this operation
 427  * @src_len: length in bytes of data used for this operation
 428  * @final: indicate final pass-through operation
 429  *
 430  * Variables required to be set when calling ccp_enqueue_cmd():
 431  *   - bit_mod, byte_swap, src, dst, src_len
 432  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 433  */
 434 struct ccp_passthru_engine {
 435         enum ccp_passthru_bitwise bit_mod;
 436         enum ccp_passthru_byteswap byte_swap;
 437
 438         struct scatterlist *mask;
 439         u32 mask_len;           /* In bytes */
 440
 441         struct scatterlist *src, *dst;
 442         u64 src_len;            /* In bytes */
 443
 444         u32 final;
 445 };
 446
 447 /**
 448  * struct ccp_passthru_nomap_engine - CCP pass-through operation
 449  *   without performing DMA mapping
 450  * @bit_mod: bitwise operation to perform
 451  * @byte_swap: byteswap operation to perform
 452  * @mask: mask to be applied to data
 453  * @mask_len: length in bytes of mask
 454  * @src: data to be used for this operation
 455  * @dst: data produced by this operation
 456  * @src_len: length in bytes of data used for this operation
 457  * @final: indicate final pass-through operation
 458  *
 459  * Variables required to be set when calling ccp_enqueue_cmd():
 460  *   - bit_mod, byte_swap, src, dst, src_len
 461  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 462  */
 463 struct ccp_passthru_nomap_engine {
 464         enum ccp_passthru_bitwise bit_mod;
 465         enum ccp_passthru_byteswap byte_swap;
 466
 467         dma_addr_t mask;
 468         u32 mask_len;           /* In bytes */
 469
 470         dma_addr_t src_dma, dst_dma;
 471         u64 src_len;            /* In bytes */
 472
 473         u32 final;
 474 };
 475
 476 /***** ECC engine *****/
 477 #define CCP_ECC_MODULUS_BYTES   48      /* 384-bits */
 478 #define CCP_ECC_MAX_OPERANDS    6
 479 #define CCP_ECC_MAX_OUTPUTS     3
 480
 481 /**
 482  * ccp_ecc_function - type of ECC function
 483  *
 484  * @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
 485  * @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
 486  * @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
 487  * @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
 488  * @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
 489  * @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
 490  */
 491 enum ccp_ecc_function {
 492         CCP_ECC_FUNCTION_MMUL_384BIT = 0,
 493         CCP_ECC_FUNCTION_MADD_384BIT,
 494         CCP_ECC_FUNCTION_MINV_384BIT,
 495         CCP_ECC_FUNCTION_PADD_384BIT,
 496         CCP_ECC_FUNCTION_PMUL_384BIT,
 497         CCP_ECC_FUNCTION_PDBL_384BIT,
 498 };
 499
 500 /**
 501  * struct ccp_ecc_modular_math - CCP ECC modular math parameters
 502  * @operand_1: first operand for the modular math operation
 503  * @operand_1_len: length of the first operand
 504  * @operand_2: second operand for the modular math operation
 505  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 506  * @operand_2_len: length of the second operand
 507  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 508  * @result: result of the modular math operation
 509  * @result_len: length of the supplied result buffer
 510  */
 511 struct ccp_ecc_modular_math {
 512         struct scatterlist *operand_1;
 513         unsigned int operand_1_len;     /* In bytes */
 514
 515         struct scatterlist *operand_2;
 516         unsigned int operand_2_len;     /* In bytes */
 517
 518         struct scatterlist *result;
 519         unsigned int result_len;        /* In bytes */
 520 };
 521
 522 /**
 523  * struct ccp_ecc_point - CCP ECC point definition
 524  * @x: the x coordinate of the ECC point
 525  * @x_len: the length of the x coordinate
 526  * @y: the y coordinate of the ECC point
 527  * @y_len: the length of the y coordinate
 528  */
 529 struct ccp_ecc_point {
 530         struct scatterlist *x;
 531         unsigned int x_len;     /* In bytes */
 532
 533         struct scatterlist *y;
 534         unsigned int y_len;     /* In bytes */
 535 };
 536
 537 /**
 538  * struct ccp_ecc_point_math - CCP ECC point math parameters
 539  * @point_1: the first point of the ECC point math operation
 540  * @point_2: the second point of the ECC point math operation
 541  *           (only used for CCP_ECC_FUNCTION_PADD_384BIT)
 542  * @domain_a: the a parameter of the ECC curve
 543  * @domain_a_len: the length of the a parameter
 544  * @scalar: the scalar parameter for the point match operation
 545  *          (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 546  * @scalar_len: the length of the scalar parameter
 547  *              (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 548  * @result: the point resulting from the point math operation
 549  */
 550 struct ccp_ecc_point_math {
 551         struct ccp_ecc_point point_1;
 552         struct ccp_ecc_point point_2;
 553
 554         struct scatterlist *domain_a;
 555         unsigned int domain_a_len;      /* In bytes */
 556
 557         struct scatterlist *scalar;
 558         unsigned int scalar_len;        /* In bytes */
 559
 560         struct ccp_ecc_point result;
 561 };
 562
 563 /**
 564  * struct ccp_ecc_engine - CCP ECC operation
 565  * @function: ECC function to perform
 566  * @mod: ECC modulus
 567  * @mod_len: length in bytes of modulus
 568  * @mm: module math parameters
 569  * @pm: point math parameters
 570  * @ecc_result: result of the ECC operation
 571  *
 572  * Variables required to be set when calling ccp_enqueue_cmd():
 573  *   - function, mod, mod_len
 574  *   - operand, operand_len, operand_count, output, output_len, output_count
 575  *   - ecc_result
 576  */
 577 struct ccp_ecc_engine {
 578         enum ccp_ecc_function function;
 579
 580         struct scatterlist *mod;
 581         u32 mod_len;            /* In bytes */
 582
 583         union {
 584                 struct ccp_ecc_modular_math mm;
 585                 struct ccp_ecc_point_math pm;
 586         } u;
 587
 588         u16 ecc_result;
 589 };
 590
 591
 592 /**
 593  * ccp_engine - CCP operation identifiers
 594  *
 595  * @CCP_ENGINE_AES: AES operation
 596  * @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
 597  * @CCP_ENGINE_RSVD1: unused
 598  * @CCP_ENGINE_SHA: SHA operation
 599  * @CCP_ENGINE_RSA: RSA operation
 600  * @CCP_ENGINE_PASSTHRU: pass-through operation
 601  * @CCP_ENGINE_ZLIB_DECOMPRESS: unused
 602  * @CCP_ENGINE_ECC: ECC operation
 603  */
 604 enum ccp_engine {
 605         CCP_ENGINE_AES = 0,
 606         CCP_ENGINE_XTS_AES_128,
 607         CCP_ENGINE_DES3,
 608         CCP_ENGINE_SHA,
 609         CCP_ENGINE_RSA,
 610         CCP_ENGINE_PASSTHRU,
 611         CCP_ENGINE_ZLIB_DECOMPRESS,
 612         CCP_ENGINE_ECC,
 613         CCP_ENGINE__LAST,
 614 };
 615
 616 /* Flag values for flags member of ccp_cmd */
 617 #define CCP_CMD_MAY_BACKLOG             0x00000001
 618 #define CCP_CMD_PASSTHRU_NO_DMA_MAP     0x00000002
 619
 620 /**
 621  * struct ccp_cmd - CCP operation request
 622  * @entry: list element (ccp driver use only)
 623  * @work: work element used for callbacks (ccp driver use only)
 624  * @ccp: CCP device to be run on
 625  * @ret: operation return code (ccp driver use only)
 626  * @flags: cmd processing flags
 627  * @engine: CCP operation to perform
 628  * @engine_error: CCP engine return code
 629  * @u: engine specific structures, refer to specific engine struct below
 630  * @callback: operation completion callback function
 631  * @data: parameter value to be supplied to the callback function
 632  *
 633  * Variables required to be set when calling ccp_enqueue_cmd():
 634  *   - engine, callback
 635  *   - See the operation structures below for what is required for each
 636  *     operation.
 637  */
 638 struct ccp_cmd {
 639         /* The list_head, work_struct, ccp and ret variables are for use
 640          * by the CCP driver only.
 641          */
 642         struct list_head entry;
 643         struct work_struct work;
 644         struct ccp_device *ccp;
 645         int ret;
 646
 647         u32 flags;
 648
 649         enum ccp_engine engine;
 650         u32 engine_error;
 651
 652         union {
 653                 struct ccp_aes_engine aes;
 654                 struct ccp_xts_aes_engine xts;
 655                 struct ccp_des3_engine des3;
 656                 struct ccp_sha_engine sha;
 657                 struct ccp_rsa_engine rsa;
 658                 struct ccp_passthru_engine passthru;
 659                 struct ccp_passthru_nomap_engine passthru_nomap;
 660                 struct ccp_ecc_engine ecc;
 661         } u;
 662
 663         /* Completion callback support */
 664         void (*callback)(void *data, int err);
 665         void *data;
 666 };
 667
 668 #endif