include/linux/ccp.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * AMD Cryptographic Coprocessor (CCP) driver
   4  *
   5  * Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
   6  *
   7  * Author: Tom Lendacky <thomas.lendacky@amd.com>
   8  * Author: Gary R Hook <gary.hook@amd.com>
   9  */
  10
  11 #ifndef __CCP_H__
  12 #define __CCP_H__
  13
  14 #include <linux/scatterlist.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/list.h>
  17 #include <crypto/aes.h>
  18 #include <crypto/sha.h>
  19
  20 struct ccp_device;
  21 struct ccp_cmd;
  22
  23 #if defined(CONFIG_CRYPTO_DEV_SP_CCP)
  24
  25 /**
  26  * ccp_present - check if a CCP device is present
  27  *
  28  * Returns zero if a CCP device is present, -ENODEV otherwise.
  29  */
  30 int ccp_present(void);
  31
  32 #define CCP_VSIZE 16
  33 #define CCP_VMASK               ((unsigned int)((1 << CCP_VSIZE) - 1))
  34 #define CCP_VERSION(v, r)       ((unsigned int)((v << CCP_VSIZE) \
  35                                                | (r & CCP_VMASK)))
  36
  37 /**
  38  * ccp_version - get the version of the CCP
  39  *
  40  * Returns a positive version number, or zero if no CCP
  41  */
  42 unsigned int ccp_version(void);
  43
  44 /**
  45  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  46  *
  47  * @cmd: ccp_cmd struct to be processed
  48  *
  49  * Refer to the ccp_cmd struct below for required fields.
  50  *
  51  * Queue a cmd to be processed by the CCP. If queueing the cmd
  52  * would exceed the defined length of the cmd queue the cmd will
  53  * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
  54  * result in a return code of -EBUSY.
  55  *
  56  * The callback routine specified in the ccp_cmd struct will be
  57  * called to notify the caller of completion (if the cmd was not
  58  * backlogged) or advancement out of the backlog. If the cmd has
  59  * advanced out of the backlog the "err" value of the callback
  60  * will be -EINPROGRESS. Any other "err" value during callback is
  61  * the result of the operation.
  62  *
  63  * The cmd has been successfully queued if:
  64  *   the return code is -EINPROGRESS or
  65  *   the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
  66  */
  67 int ccp_enqueue_cmd(struct ccp_cmd *cmd);
  68
  69 #else /* CONFIG_CRYPTO_DEV_CCP_SP_DEV is not enabled */
  70
  71 static inline int ccp_present(void)
  72 {
  73         return -ENODEV;
  74 }
  75
  76 static inline unsigned int ccp_version(void)
  77 {
  78         return 0;
  79 }
  80
  81 static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
  82 {
  83         return -ENODEV;
  84 }
  85
  86 #endif /* CONFIG_CRYPTO_DEV_SP_CCP */
  87
  88
  89 /***** AES engine *****/
  90 /**
  91  * ccp_aes_type - AES key size
  92  *
  93  * @CCP_AES_TYPE_128: 128-bit key
  94  * @CCP_AES_TYPE_192: 192-bit key
  95  * @CCP_AES_TYPE_256: 256-bit key
  96  */
  97 enum ccp_aes_type {
  98         CCP_AES_TYPE_128 = 0,
  99         CCP_AES_TYPE_192,
 100         CCP_AES_TYPE_256,
 101         CCP_AES_TYPE__LAST,
 102 };
 103
 104 /**
 105  * ccp_aes_mode - AES operation mode
 106  *
 107  * @CCP_AES_MODE_ECB: ECB mode
 108  * @CCP_AES_MODE_CBC: CBC mode
 109  * @CCP_AES_MODE_OFB: OFB mode
 110  * @CCP_AES_MODE_CFB: CFB mode
 111  * @CCP_AES_MODE_CTR: CTR mode
 112  * @CCP_AES_MODE_CMAC: CMAC mode
 113  */
 114 enum ccp_aes_mode {
 115         CCP_AES_MODE_ECB = 0,
 116         CCP_AES_MODE_CBC,
 117         CCP_AES_MODE_OFB,
 118         CCP_AES_MODE_CFB,
 119         CCP_AES_MODE_CTR,
 120         CCP_AES_MODE_CMAC,
 121         CCP_AES_MODE_GHASH,
 122         CCP_AES_MODE_GCTR,
 123         CCP_AES_MODE_GCM,
 124         CCP_AES_MODE_GMAC,
 125         CCP_AES_MODE__LAST,
 126 };
 127
 128 /**
 129  * ccp_aes_mode - AES operation mode
 130  *
 131  * @CCP_AES_ACTION_DECRYPT: AES decrypt operation
 132  * @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
 133  */
 134 enum ccp_aes_action {
 135         CCP_AES_ACTION_DECRYPT = 0,
 136         CCP_AES_ACTION_ENCRYPT,
 137         CCP_AES_ACTION__LAST,
 138 };
 139 /* Overloaded field */
 140 #define CCP_AES_GHASHAAD        CCP_AES_ACTION_DECRYPT
 141 #define CCP_AES_GHASHFINAL      CCP_AES_ACTION_ENCRYPT
 142
 143 /**
 144  * struct ccp_aes_engine - CCP AES operation
 145  * @type: AES operation key size
 146  * @mode: AES operation mode
 147  * @action: AES operation (decrypt/encrypt)
 148  * @key: key to be used for this AES operation
 149  * @key_len: length in bytes of key
 150  * @iv: IV to be used for this AES operation
 151  * @iv_len: length in bytes of iv
 152  * @src: data to be used for this operation
 153  * @dst: data produced by this operation
 154  * @src_len: length in bytes of data used for this operation
 155  * @cmac_final: indicates final operation when running in CMAC mode
 156  * @cmac_key: K1/K2 key used in final CMAC operation
 157  * @cmac_key_len: length in bytes of cmac_key
 158  *
 159  * Variables required to be set when calling ccp_enqueue_cmd():
 160  *   - type, mode, action, key, key_len, src, dst, src_len
 161  *   - iv, iv_len for any mode other than ECB
 162  *   - cmac_final for CMAC mode
 163  *   - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
 164  *
 165  * The iv variable is used as both input and output. On completion of the
 166  * AES operation the new IV overwrites the old IV.
 167  */
 168 struct ccp_aes_engine {
 169         enum ccp_aes_type type;
 170         enum ccp_aes_mode mode;
 171         enum ccp_aes_action action;
 172
 173         struct scatterlist *key;
 174         u32 key_len;            /* In bytes */
 175
 176         struct scatterlist *iv;
 177         u32 iv_len;             /* In bytes */
 178
 179         struct scatterlist *src, *dst;
 180         u64 src_len;            /* In bytes */
 181
 182         u32 cmac_final;         /* Indicates final cmac cmd */
 183         struct scatterlist *cmac_key;   /* K1/K2 cmac key required for
 184                                          * final cmac cmd */
 185         u32 cmac_key_len;       /* In bytes */
 186
 187         u32 aad_len;            /* In bytes */
 188 };
 189
 190 /***** XTS-AES engine *****/
 191 /**
 192  * ccp_xts_aes_unit_size - XTS unit size
 193  *
 194  * @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
 195  * @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
 196  * @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
 197  * @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
 198  * @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
 199  */
 200 enum ccp_xts_aes_unit_size {
 201         CCP_XTS_AES_UNIT_SIZE_16 = 0,
 202         CCP_XTS_AES_UNIT_SIZE_512,
 203         CCP_XTS_AES_UNIT_SIZE_1024,
 204         CCP_XTS_AES_UNIT_SIZE_2048,
 205         CCP_XTS_AES_UNIT_SIZE_4096,
 206         CCP_XTS_AES_UNIT_SIZE__LAST,
 207 };
 208
 209 /**
 210  * struct ccp_xts_aes_engine - CCP XTS AES operation
 211  * @action: AES operation (decrypt/encrypt)
 212  * @unit_size: unit size of the XTS operation
 213  * @key: key to be used for this XTS AES operation
 214  * @key_len: length in bytes of key
 215  * @iv: IV to be used for this XTS AES operation
 216  * @iv_len: length in bytes of iv
 217  * @src: data to be used for this operation
 218  * @dst: data produced by this operation
 219  * @src_len: length in bytes of data used for this operation
 220  * @final: indicates final XTS operation
 221  *
 222  * Variables required to be set when calling ccp_enqueue_cmd():
 223  *   - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
 224  *
 225  * The iv variable is used as both input and output. On completion of the
 226  * AES operation the new IV overwrites the old IV.
 227  */
 228 struct ccp_xts_aes_engine {
 229         enum ccp_aes_type type;
 230         enum ccp_aes_action action;
 231         enum ccp_xts_aes_unit_size unit_size;
 232
 233         struct scatterlist *key;
 234         u32 key_len;            /* In bytes */
 235
 236         struct scatterlist *iv;
 237         u32 iv_len;             /* In bytes */
 238
 239         struct scatterlist *src, *dst;
 240         u64 src_len;            /* In bytes */
 241
 242         u32 final;
 243 };
 244
 245 /***** SHA engine *****/
 246 /**
 247  * ccp_sha_type - type of SHA operation
 248  *
 249  * @CCP_SHA_TYPE_1: SHA-1 operation
 250  * @CCP_SHA_TYPE_224: SHA-224 operation
 251  * @CCP_SHA_TYPE_256: SHA-256 operation
 252  */
 253 enum ccp_sha_type {
 254         CCP_SHA_TYPE_1 = 1,
 255         CCP_SHA_TYPE_224,
 256         CCP_SHA_TYPE_256,
 257         CCP_SHA_TYPE_384,
 258         CCP_SHA_TYPE_512,
 259         CCP_SHA_TYPE__LAST,
 260 };
 261
 262 /**
 263  * struct ccp_sha_engine - CCP SHA operation
 264  * @type: Type of SHA operation
 265  * @ctx: current hash value
 266  * @ctx_len: length in bytes of hash value
 267  * @src: data to be used for this operation
 268  * @src_len: length in bytes of data used for this operation
 269  * @opad: data to be used for final HMAC operation
 270  * @opad_len: length in bytes of data used for final HMAC operation
 271  * @first: indicates first SHA operation
 272  * @final: indicates final SHA operation
 273  * @msg_bits: total length of the message in bits used in final SHA operation
 274  *
 275  * Variables required to be set when calling ccp_enqueue_cmd():
 276  *   - type, ctx, ctx_len, src, src_len, final
 277  *   - msg_bits if final is non-zero
 278  *
 279  * The ctx variable is used as both input and output. On completion of the
 280  * SHA operation the new hash value overwrites the old hash value.
 281  */
 282 struct ccp_sha_engine {
 283         enum ccp_sha_type type;
 284
 285         struct scatterlist *ctx;
 286         u32 ctx_len;            /* In bytes */
 287
 288         struct scatterlist *src;
 289         u64 src_len;            /* In bytes */
 290
 291         struct scatterlist *opad;
 292         u32 opad_len;           /* In bytes */
 293
 294         u32 first;              /* Indicates first sha cmd */
 295         u32 final;              /* Indicates final sha cmd */
 296         u64 msg_bits;           /* Message length in bits required for
 297                                  * final sha cmd */
 298 };
 299
 300 /***** 3DES engine *****/
 301 enum ccp_des3_mode {
 302         CCP_DES3_MODE_ECB = 0,
 303         CCP_DES3_MODE_CBC,
 304         CCP_DES3_MODE_CFB,
 305         CCP_DES3_MODE__LAST,
 306 };
 307
 308 enum ccp_des3_type {
 309         CCP_DES3_TYPE_168 = 1,
 310         CCP_DES3_TYPE__LAST,
 311         };
 312
 313 enum ccp_des3_action {
 314         CCP_DES3_ACTION_DECRYPT = 0,
 315         CCP_DES3_ACTION_ENCRYPT,
 316         CCP_DES3_ACTION__LAST,
 317 };
 318
 319 /**
 320  * struct ccp_des3_engine - CCP SHA operation
 321  * @type: Type of 3DES operation
 322  * @mode: cipher mode
 323  * @action: 3DES operation (decrypt/encrypt)
 324  * @key: key to be used for this 3DES operation
 325  * @key_len: length of key (in bytes)
 326  * @iv: IV to be used for this AES operation
 327  * @iv_len: length in bytes of iv
 328  * @src: input data to be used for this operation
 329  * @src_len: length of input data used for this operation (in bytes)
 330  * @dst: output data produced by this operation
 331  *
 332  * Variables required to be set when calling ccp_enqueue_cmd():
 333  *   - type, mode, action, key, key_len, src, dst, src_len
 334  *   - iv, iv_len for any mode other than ECB
 335  *
 336  * The iv variable is used as both input and output. On completion of the
 337  * 3DES operation the new IV overwrites the old IV.
 338  */
 339 struct ccp_des3_engine {
 340         enum ccp_des3_type type;
 341         enum ccp_des3_mode mode;
 342         enum ccp_des3_action action;
 343
 344         struct scatterlist *key;
 345         u32 key_len;        /* In bytes */
 346
 347         struct scatterlist *iv;
 348         u32 iv_len;          /* In bytes */
 349
 350         struct scatterlist *src, *dst;
 351         u64 src_len;        /* In bytes */
 352 };
 353
 354 /***** RSA engine *****/
 355 /**
 356  * struct ccp_rsa_engine - CCP RSA operation
 357  * @key_size: length in bits of RSA key
 358  * @exp: RSA exponent
 359  * @exp_len: length in bytes of exponent
 360  * @mod: RSA modulus
 361  * @mod_len: length in bytes of modulus
 362  * @src: data to be used for this operation
 363  * @dst: data produced by this operation
 364  * @src_len: length in bytes of data used for this operation
 365  *
 366  * Variables required to be set when calling ccp_enqueue_cmd():
 367  *   - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
 368  */
 369 struct ccp_rsa_engine {
 370         u32 key_size;           /* In bits */
 371
 372         struct scatterlist *exp;
 373         u32 exp_len;            /* In bytes */
 374
 375         struct scatterlist *mod;
 376         u32 mod_len;            /* In bytes */
 377
 378         struct scatterlist *src, *dst;
 379         u32 src_len;            /* In bytes */
 380 };
 381
 382 /***** Passthru engine *****/
 383 /**
 384  * ccp_passthru_bitwise - type of bitwise passthru operation
 385  *
 386  * @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
 387  * @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
 388  * @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
 389  * @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
 390  * @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
 391  */
 392 enum ccp_passthru_bitwise {
 393         CCP_PASSTHRU_BITWISE_NOOP = 0,
 394         CCP_PASSTHRU_BITWISE_AND,
 395         CCP_PASSTHRU_BITWISE_OR,
 396         CCP_PASSTHRU_BITWISE_XOR,
 397         CCP_PASSTHRU_BITWISE_MASK,
 398         CCP_PASSTHRU_BITWISE__LAST,
 399 };
 400
 401 /**
 402  * ccp_passthru_byteswap - type of byteswap passthru operation
 403  *
 404  * @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
 405  * @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
 406  * @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
 407  */
 408 enum ccp_passthru_byteswap {
 409         CCP_PASSTHRU_BYTESWAP_NOOP = 0,
 410         CCP_PASSTHRU_BYTESWAP_32BIT,
 411         CCP_PASSTHRU_BYTESWAP_256BIT,
 412         CCP_PASSTHRU_BYTESWAP__LAST,
 413 };
 414
 415 /**
 416  * struct ccp_passthru_engine - CCP pass-through operation
 417  * @bit_mod: bitwise operation to perform
 418  * @byte_swap: byteswap operation to perform
 419  * @mask: mask to be applied to data
 420  * @mask_len: length in bytes of mask
 421  * @src: data to be used for this operation
 422  * @dst: data produced by this operation
 423  * @src_len: length in bytes of data used for this operation
 424  * @final: indicate final pass-through operation
 425  *
 426  * Variables required to be set when calling ccp_enqueue_cmd():
 427  *   - bit_mod, byte_swap, src, dst, src_len
 428  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 429  */
 430 struct ccp_passthru_engine {
 431         enum ccp_passthru_bitwise bit_mod;
 432         enum ccp_passthru_byteswap byte_swap;
 433
 434         struct scatterlist *mask;
 435         u32 mask_len;           /* In bytes */
 436
 437         struct scatterlist *src, *dst;
 438         u64 src_len;            /* In bytes */
 439
 440         u32 final;
 441 };
 442
 443 /**
 444  * struct ccp_passthru_nomap_engine - CCP pass-through operation
 445  *   without performing DMA mapping
 446  * @bit_mod: bitwise operation to perform
 447  * @byte_swap: byteswap operation to perform
 448  * @mask: mask to be applied to data
 449  * @mask_len: length in bytes of mask
 450  * @src: data to be used for this operation
 451  * @dst: data produced by this operation
 452  * @src_len: length in bytes of data used for this operation
 453  * @final: indicate final pass-through operation
 454  *
 455  * Variables required to be set when calling ccp_enqueue_cmd():
 456  *   - bit_mod, byte_swap, src, dst, src_len
 457  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 458  */
 459 struct ccp_passthru_nomap_engine {
 460         enum ccp_passthru_bitwise bit_mod;
 461         enum ccp_passthru_byteswap byte_swap;
 462
 463         dma_addr_t mask;
 464         u32 mask_len;           /* In bytes */
 465
 466         dma_addr_t src_dma, dst_dma;
 467         u64 src_len;            /* In bytes */
 468
 469         u32 final;
 470 };
 471
 472 /***** ECC engine *****/
 473 #define CCP_ECC_MODULUS_BYTES   48      /* 384-bits */
 474 #define CCP_ECC_MAX_OPERANDS    6
 475 #define CCP_ECC_MAX_OUTPUTS     3
 476
 477 /**
 478  * ccp_ecc_function - type of ECC function
 479  *
 480  * @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
 481  * @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
 482  * @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
 483  * @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
 484  * @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
 485  * @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
 486  */
 487 enum ccp_ecc_function {
 488         CCP_ECC_FUNCTION_MMUL_384BIT = 0,
 489         CCP_ECC_FUNCTION_MADD_384BIT,
 490         CCP_ECC_FUNCTION_MINV_384BIT,
 491         CCP_ECC_FUNCTION_PADD_384BIT,
 492         CCP_ECC_FUNCTION_PMUL_384BIT,
 493         CCP_ECC_FUNCTION_PDBL_384BIT,
 494 };
 495
 496 /**
 497  * struct ccp_ecc_modular_math - CCP ECC modular math parameters
 498  * @operand_1: first operand for the modular math operation
 499  * @operand_1_len: length of the first operand
 500  * @operand_2: second operand for the modular math operation
 501  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 502  * @operand_2_len: length of the second operand
 503  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 504  * @result: result of the modular math operation
 505  * @result_len: length of the supplied result buffer
 506  */
 507 struct ccp_ecc_modular_math {
 508         struct scatterlist *operand_1;
 509         unsigned int operand_1_len;     /* In bytes */
 510
 511         struct scatterlist *operand_2;
 512         unsigned int operand_2_len;     /* In bytes */
 513
 514         struct scatterlist *result;
 515         unsigned int result_len;        /* In bytes */
 516 };
 517
 518 /**
 519  * struct ccp_ecc_point - CCP ECC point definition
 520  * @x: the x coordinate of the ECC point
 521  * @x_len: the length of the x coordinate
 522  * @y: the y coordinate of the ECC point
 523  * @y_len: the length of the y coordinate
 524  */
 525 struct ccp_ecc_point {
 526         struct scatterlist *x;
 527         unsigned int x_len;     /* In bytes */
 528
 529         struct scatterlist *y;
 530         unsigned int y_len;     /* In bytes */
 531 };
 532
 533 /**
 534  * struct ccp_ecc_point_math - CCP ECC point math parameters
 535  * @point_1: the first point of the ECC point math operation
 536  * @point_2: the second point of the ECC point math operation
 537  *           (only used for CCP_ECC_FUNCTION_PADD_384BIT)
 538  * @domain_a: the a parameter of the ECC curve
 539  * @domain_a_len: the length of the a parameter
 540  * @scalar: the scalar parameter for the point match operation
 541  *          (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 542  * @scalar_len: the length of the scalar parameter
 543  *              (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 544  * @result: the point resulting from the point math operation
 545  */
 546 struct ccp_ecc_point_math {
 547         struct ccp_ecc_point point_1;
 548         struct ccp_ecc_point point_2;
 549
 550         struct scatterlist *domain_a;
 551         unsigned int domain_a_len;      /* In bytes */
 552
 553         struct scatterlist *scalar;
 554         unsigned int scalar_len;        /* In bytes */
 555
 556         struct ccp_ecc_point result;
 557 };
 558
 559 /**
 560  * struct ccp_ecc_engine - CCP ECC operation
 561  * @function: ECC function to perform
 562  * @mod: ECC modulus
 563  * @mod_len: length in bytes of modulus
 564  * @mm: module math parameters
 565  * @pm: point math parameters
 566  * @ecc_result: result of the ECC operation
 567  *
 568  * Variables required to be set when calling ccp_enqueue_cmd():
 569  *   - function, mod, mod_len
 570  *   - operand, operand_len, operand_count, output, output_len, output_count
 571  *   - ecc_result
 572  */
 573 struct ccp_ecc_engine {
 574         enum ccp_ecc_function function;
 575
 576         struct scatterlist *mod;
 577         u32 mod_len;            /* In bytes */
 578
 579         union {
 580                 struct ccp_ecc_modular_math mm;
 581                 struct ccp_ecc_point_math pm;
 582         } u;
 583
 584         u16 ecc_result;
 585 };
 586
 587
 588 /**
 589  * ccp_engine - CCP operation identifiers
 590  *
 591  * @CCP_ENGINE_AES: AES operation
 592  * @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
 593  * @CCP_ENGINE_RSVD1: unused
 594  * @CCP_ENGINE_SHA: SHA operation
 595  * @CCP_ENGINE_RSA: RSA operation
 596  * @CCP_ENGINE_PASSTHRU: pass-through operation
 597  * @CCP_ENGINE_ZLIB_DECOMPRESS: unused
 598  * @CCP_ENGINE_ECC: ECC operation
 599  */
 600 enum ccp_engine {
 601         CCP_ENGINE_AES = 0,
 602         CCP_ENGINE_XTS_AES_128,
 603         CCP_ENGINE_DES3,
 604         CCP_ENGINE_SHA,
 605         CCP_ENGINE_RSA,
 606         CCP_ENGINE_PASSTHRU,
 607         CCP_ENGINE_ZLIB_DECOMPRESS,
 608         CCP_ENGINE_ECC,
 609         CCP_ENGINE__LAST,
 610 };
 611
 612 /* Flag values for flags member of ccp_cmd */
 613 #define CCP_CMD_MAY_BACKLOG             0x00000001
 614 #define CCP_CMD_PASSTHRU_NO_DMA_MAP     0x00000002
 615
 616 /**
 617  * struct ccp_cmd - CCP operation request
 618  * @entry: list element (ccp driver use only)
 619  * @work: work element used for callbacks (ccp driver use only)
 620  * @ccp: CCP device to be run on
 621  * @ret: operation return code (ccp driver use only)
 622  * @flags: cmd processing flags
 623  * @engine: CCP operation to perform
 624  * @engine_error: CCP engine return code
 625  * @u: engine specific structures, refer to specific engine struct below
 626  * @callback: operation completion callback function
 627  * @data: parameter value to be supplied to the callback function
 628  *
 629  * Variables required to be set when calling ccp_enqueue_cmd():
 630  *   - engine, callback
 631  *   - See the operation structures below for what is required for each
 632  *     operation.
 633  */
 634 struct ccp_cmd {
 635         /* The list_head, work_struct, ccp and ret variables are for use
 636          * by the CCP driver only.
 637          */
 638         struct list_head entry;
 639         struct work_struct work;
 640         struct ccp_device *ccp;
 641         int ret;
 642
 643         u32 flags;
 644
 645         enum ccp_engine engine;
 646         u32 engine_error;
 647
 648         union {
 649                 struct ccp_aes_engine aes;
 650                 struct ccp_xts_aes_engine xts;
 651                 struct ccp_des3_engine des3;
 652                 struct ccp_sha_engine sha;
 653                 struct ccp_rsa_engine rsa;
 654                 struct ccp_passthru_engine passthru;
 655                 struct ccp_passthru_nomap_engine passthru_nomap;
 656                 struct ccp_ecc_engine ecc;
 657         } u;
 658
 659         /* Completion callback support */
 660         void (*callback)(void *data, int err);
 661         void *data;
 662 };
 663
 664 #endif