Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 7e9c991c95e03fc1df55553461d95f9153d37cd7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
/*
 * AMD Cryptographic Coprocessor (CCP) driver
 *
 * Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 * Author: Gary R Hook <gary.hook@amd.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __CCP_H__
#define __CCP_H__

#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/list.h>
#include <crypto/aes.h>
#include <crypto/sha.h>

struct ccp_device;
struct ccp_cmd;

#if defined(CONFIG_CRYPTO_DEV_SP_CCP)

/**
 * ccp_present - check if a CCP device is present
 *
 * Returns zero if a CCP device is present, -ENODEV otherwise.
 */
int ccp_present(void);

#define	CCP_VSIZE 16
#define	CCP_VMASK		((unsigned int)((1 << CCP_VSIZE) - 1))
#define	CCP_VERSION(v, r)	((unsigned int)((v << CCP_VSIZE) \
					       | (r & CCP_VMASK)))

/**
 * ccp_version - get the version of the CCP
 *
 * Returns a positive version number, or zero if no CCP
 */
unsigned int ccp_version(void);

/**
 * ccp_enqueue_cmd - queue an operation for processing by the CCP
 *
 * @cmd: ccp_cmd struct to be processed
 *
 * Refer to the ccp_cmd struct below for required fields.
 *
 * Queue a cmd to be processed by the CCP. If queueing the cmd
 * would exceed the defined length of the cmd queue the cmd will
 * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
 * result in a return code of -EBUSY.
 *
 * The callback routine specified in the ccp_cmd struct will be
 * called to notify the caller of completion (if the cmd was not
 * backlogged) or advancement out of the backlog. If the cmd has
 * advanced out of the backlog the "err" value of the callback
 * will be -EINPROGRESS. Any other "err" value during callback is
 * the result of the operation.
 *
 * The cmd has been successfully queued if:
 *   the return code is -EINPROGRESS or
 *   the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
 */
int ccp_enqueue_cmd(struct ccp_cmd *cmd);

#else /* CONFIG_CRYPTO_DEV_CCP_SP_DEV is not enabled */

static inline int ccp_present(void)
{
	return -ENODEV;
}

static inline unsigned int ccp_version(void)
{
	return 0;
}

static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
{
	return -ENODEV;
}

#endif /* CONFIG_CRYPTO_DEV_SP_CCP */


/***** AES engine *****/
/**
 * ccp_aes_type - AES key size
 *
 * @CCP_AES_TYPE_128: 128-bit key
 * @CCP_AES_TYPE_192: 192-bit key
 * @CCP_AES_TYPE_256: 256-bit key
 */
enum ccp_aes_type {
	CCP_AES_TYPE_128 = 0,
	CCP_AES_TYPE_192,
	CCP_AES_TYPE_256,
	CCP_AES_TYPE__LAST,
};

/**
 * ccp_aes_mode - AES operation mode
 *
 * @CCP_AES_MODE_ECB: ECB mode
 * @CCP_AES_MODE_CBC: CBC mode
 * @CCP_AES_MODE_OFB: OFB mode
 * @CCP_AES_MODE_CFB: CFB mode
 * @CCP_AES_MODE_CTR: CTR mode
 * @CCP_AES_MODE_CMAC: CMAC mode
 */
enum ccp_aes_mode {
	CCP_AES_MODE_ECB = 0,
	CCP_AES_MODE_CBC,
	CCP_AES_MODE_OFB,
	CCP_AES_MODE_CFB,
	CCP_AES_MODE_CTR,
	CCP_AES_MODE_CMAC,
	CCP_AES_MODE_GHASH,
	CCP_AES_MODE_GCTR,
	CCP_AES_MODE_GCM,
	CCP_AES_MODE_GMAC,
	CCP_AES_MODE__LAST,
};

/**
 * ccp_aes_mode - AES operation mode
 *
 * @CCP_AES_ACTION_DECRYPT: AES decrypt operation
 * @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
 */
enum ccp_aes_action {
	CCP_AES_ACTION_DECRYPT = 0,
	CCP_AES_ACTION_ENCRYPT,
	CCP_AES_ACTION__LAST,
};
/* Overloaded field */
#define	CCP_AES_GHASHAAD	CCP_AES_ACTION_DECRYPT
#define	CCP_AES_GHASHFINAL	CCP_AES_ACTION_ENCRYPT

/**
 * struct ccp_aes_engine - CCP AES operation
 * @type: AES operation key size
 * @mode: AES operation mode
 * @action: AES operation (decrypt/encrypt)
 * @key: key to be used for this AES operation
 * @key_len: length in bytes of key
 * @iv: IV to be used for this AES operation
 * @iv_len: length in bytes of iv
 * @src: data to be used for this operation
 * @dst: data produced by this operation
 * @src_len: length in bytes of data used for this operation
 * @cmac_final: indicates final operation when running in CMAC mode
 * @cmac_key: K1/K2 key used in final CMAC operation
 * @cmac_key_len: length in bytes of cmac_key
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - type, mode, action, key, key_len, src, dst, src_len
 *   - iv, iv_len for any mode other than ECB
 *   - cmac_final for CMAC mode
 *   - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
 *
 * The iv variable is used as both input and output. On completion of the
 * AES operation the new IV overwrites the old IV.
 */
struct ccp_aes_engine {
	enum ccp_aes_type type;
	enum ccp_aes_mode mode;
	enum ccp_aes_action action;

	struct scatterlist *key;
	u32 key_len;		/* In bytes */

	struct scatterlist *iv;
	u32 iv_len;		/* In bytes */

	struct scatterlist *src, *dst;
	u64 src_len;		/* In bytes */

	u32 cmac_final;		/* Indicates final cmac cmd */
	struct scatterlist *cmac_key;	/* K1/K2 cmac key required for
					 * final cmac cmd */
	u32 cmac_key_len;	/* In bytes */

	u32 aad_len;		/* In bytes */
};

/***** XTS-AES engine *****/
/**
 * ccp_xts_aes_unit_size - XTS unit size
 *
 * @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
 * @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
 * @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
 * @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
 * @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
 */
enum ccp_xts_aes_unit_size {
	CCP_XTS_AES_UNIT_SIZE_16 = 0,
	CCP_XTS_AES_UNIT_SIZE_512,
	CCP_XTS_AES_UNIT_SIZE_1024,
	CCP_XTS_AES_UNIT_SIZE_2048,
	CCP_XTS_AES_UNIT_SIZE_4096,
	CCP_XTS_AES_UNIT_SIZE__LAST,
};

/**
 * struct ccp_xts_aes_engine - CCP XTS AES operation
 * @action: AES operation (decrypt/encrypt)
 * @unit_size: unit size of the XTS operation
 * @key: key to be used for this XTS AES operation
 * @key_len: length in bytes of key
 * @iv: IV to be used for this XTS AES operation
 * @iv_len: length in bytes of iv
 * @src: data to be used for this operation
 * @dst: data produced by this operation
 * @src_len: length in bytes of data used for this operation
 * @final: indicates final XTS operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
 *
 * The iv variable is used as both input and output. On completion of the
 * AES operation the new IV overwrites the old IV.
 */
struct ccp_xts_aes_engine {
	enum ccp_aes_type type;
	enum ccp_aes_action action;
	enum ccp_xts_aes_unit_size unit_size;

	struct scatterlist *key;
	u32 key_len;		/* In bytes */

	struct scatterlist *iv;
	u32 iv_len;		/* In bytes */

	struct scatterlist *src, *dst;
	u64 src_len;		/* In bytes */

	u32 final;
};

/***** SHA engine *****/
/**
 * ccp_sha_type - type of SHA operation
 *
 * @CCP_SHA_TYPE_1: SHA-1 operation
 * @CCP_SHA_TYPE_224: SHA-224 operation
 * @CCP_SHA_TYPE_256: SHA-256 operation
 */
enum ccp_sha_type {
	CCP_SHA_TYPE_1 = 1,
	CCP_SHA_TYPE_224,
	CCP_SHA_TYPE_256,
	CCP_SHA_TYPE_384,
	CCP_SHA_TYPE_512,
	CCP_SHA_TYPE__LAST,
};

/**
 * struct ccp_sha_engine - CCP SHA operation
 * @type: Type of SHA operation
 * @ctx: current hash value
 * @ctx_len: length in bytes of hash value
 * @src: data to be used for this operation
 * @src_len: length in bytes of data used for this operation
 * @opad: data to be used for final HMAC operation
 * @opad_len: length in bytes of data used for final HMAC operation
 * @first: indicates first SHA operation
 * @final: indicates final SHA operation
 * @msg_bits: total length of the message in bits used in final SHA operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - type, ctx, ctx_len, src, src_len, final
 *   - msg_bits if final is non-zero
 *
 * The ctx variable is used as both input and output. On completion of the
 * SHA operation the new hash value overwrites the old hash value.
 */
struct ccp_sha_engine {
	enum ccp_sha_type type;

	struct scatterlist *ctx;
	u32 ctx_len;		/* In bytes */

	struct scatterlist *src;
	u64 src_len;		/* In bytes */

	struct scatterlist *opad;
	u32 opad_len;		/* In bytes */

	u32 first;		/* Indicates first sha cmd */
	u32 final;		/* Indicates final sha cmd */
	u64 msg_bits;		/* Message length in bits required for
				 * final sha cmd */
};

/***** 3DES engine *****/
enum ccp_des3_mode {
	CCP_DES3_MODE_ECB = 0,
	CCP_DES3_MODE_CBC,
	CCP_DES3_MODE_CFB,
	CCP_DES3_MODE__LAST,
};

enum ccp_des3_type {
	CCP_DES3_TYPE_168 = 1,
	CCP_DES3_TYPE__LAST,
	};

enum ccp_des3_action {
	CCP_DES3_ACTION_DECRYPT = 0,
	CCP_DES3_ACTION_ENCRYPT,
	CCP_DES3_ACTION__LAST,
};

/**
 * struct ccp_des3_engine - CCP SHA operation
 * @type: Type of 3DES operation
 * @mode: cipher mode
 * @action: 3DES operation (decrypt/encrypt)
 * @key: key to be used for this 3DES operation
 * @key_len: length of key (in bytes)
 * @iv: IV to be used for this AES operation
 * @iv_len: length in bytes of iv
 * @src: input data to be used for this operation
 * @src_len: length of input data used for this operation (in bytes)
 * @dst: output data produced by this operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - type, mode, action, key, key_len, src, dst, src_len
 *   - iv, iv_len for any mode other than ECB
 *
 * The iv variable is used as both input and output. On completion of the
 * 3DES operation the new IV overwrites the old IV.
 */
struct ccp_des3_engine {
	enum ccp_des3_type type;
	enum ccp_des3_mode mode;
	enum ccp_des3_action action;

	struct scatterlist *key;
	u32 key_len;	    /* In bytes */

	struct scatterlist *iv;
	u32 iv_len;	     /* In bytes */

	struct scatterlist *src, *dst;
	u64 src_len;	    /* In bytes */
};

/***** RSA engine *****/
/**
 * struct ccp_rsa_engine - CCP RSA operation
 * @key_size: length in bits of RSA key
 * @exp: RSA exponent
 * @exp_len: length in bytes of exponent
 * @mod: RSA modulus
 * @mod_len: length in bytes of modulus
 * @src: data to be used for this operation
 * @dst: data produced by this operation
 * @src_len: length in bytes of data used for this operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
 */
struct ccp_rsa_engine {
	u32 key_size;		/* In bits */

	struct scatterlist *exp;
	u32 exp_len;		/* In bytes */

	struct scatterlist *mod;
	u32 mod_len;		/* In bytes */

	struct scatterlist *src, *dst;
	u32 src_len;		/* In bytes */
};

/***** Passthru engine *****/
/**
 * ccp_passthru_bitwise - type of bitwise passthru operation
 *
 * @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
 * @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
 * @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
 * @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
 * @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
 */
enum ccp_passthru_bitwise {
	CCP_PASSTHRU_BITWISE_NOOP = 0,
	CCP_PASSTHRU_BITWISE_AND,
	CCP_PASSTHRU_BITWISE_OR,
	CCP_PASSTHRU_BITWISE_XOR,
	CCP_PASSTHRU_BITWISE_MASK,
	CCP_PASSTHRU_BITWISE__LAST,
};

/**
 * ccp_passthru_byteswap - type of byteswap passthru operation
 *
 * @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
 * @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
 * @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
 */
enum ccp_passthru_byteswap {
	CCP_PASSTHRU_BYTESWAP_NOOP = 0,
	CCP_PASSTHRU_BYTESWAP_32BIT,
	CCP_PASSTHRU_BYTESWAP_256BIT,
	CCP_PASSTHRU_BYTESWAP__LAST,
};

/**
 * struct ccp_passthru_engine - CCP pass-through operation
 * @bit_mod: bitwise operation to perform
 * @byte_swap: byteswap operation to perform
 * @mask: mask to be applied to data
 * @mask_len: length in bytes of mask
 * @src: data to be used for this operation
 * @dst: data produced by this operation
 * @src_len: length in bytes of data used for this operation
 * @final: indicate final pass-through operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - bit_mod, byte_swap, src, dst, src_len
 *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 */
struct ccp_passthru_engine {
	enum ccp_passthru_bitwise bit_mod;
	enum ccp_passthru_byteswap byte_swap;

	struct scatterlist *mask;
	u32 mask_len;		/* In bytes */

	struct scatterlist *src, *dst;
	u64 src_len;		/* In bytes */

	u32 final;
};

/**
 * struct ccp_passthru_nomap_engine - CCP pass-through operation
 *   without performing DMA mapping
 * @bit_mod: bitwise operation to perform
 * @byte_swap: byteswap operation to perform
 * @mask: mask to be applied to data
 * @mask_len: length in bytes of mask
 * @src: data to be used for this operation
 * @dst: data produced by this operation
 * @src_len: length in bytes of data used for this operation
 * @final: indicate final pass-through operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - bit_mod, byte_swap, src, dst, src_len
 *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 */
struct ccp_passthru_nomap_engine {
	enum ccp_passthru_bitwise bit_mod;
	enum ccp_passthru_byteswap byte_swap;

	dma_addr_t mask;
	u32 mask_len;		/* In bytes */

	dma_addr_t src_dma, dst_dma;
	u64 src_len;		/* In bytes */

	u32 final;
};

/***** ECC engine *****/
#define CCP_ECC_MODULUS_BYTES	48	/* 384-bits */
#define CCP_ECC_MAX_OPERANDS	6
#define CCP_ECC_MAX_OUTPUTS	3

/**
 * ccp_ecc_function - type of ECC function
 *
 * @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
 * @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
 * @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
 * @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
 * @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
 * @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
 */
enum ccp_ecc_function {
	CCP_ECC_FUNCTION_MMUL_384BIT = 0,
	CCP_ECC_FUNCTION_MADD_384BIT,
	CCP_ECC_FUNCTION_MINV_384BIT,
	CCP_ECC_FUNCTION_PADD_384BIT,
	CCP_ECC_FUNCTION_PMUL_384BIT,
	CCP_ECC_FUNCTION_PDBL_384BIT,
};

/**
 * struct ccp_ecc_modular_math - CCP ECC modular math parameters
 * @operand_1: first operand for the modular math operation
 * @operand_1_len: length of the first operand
 * @operand_2: second operand for the modular math operation
 *	       (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 * @operand_2_len: length of the second operand
 *	       (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 * @result: result of the modular math operation
 * @result_len: length of the supplied result buffer
 */
struct ccp_ecc_modular_math {
	struct scatterlist *operand_1;
	unsigned int operand_1_len;	/* In bytes */

	struct scatterlist *operand_2;
	unsigned int operand_2_len;	/* In bytes */

	struct scatterlist *result;
	unsigned int result_len;	/* In bytes */
};

/**
 * struct ccp_ecc_point - CCP ECC point definition
 * @x: the x coordinate of the ECC point
 * @x_len: the length of the x coordinate
 * @y: the y coordinate of the ECC point
 * @y_len: the length of the y coordinate
 */
struct ccp_ecc_point {
	struct scatterlist *x;
	unsigned int x_len;	/* In bytes */

	struct scatterlist *y;
	unsigned int y_len;	/* In bytes */
};

/**
 * struct ccp_ecc_point_math - CCP ECC point math parameters
 * @point_1: the first point of the ECC point math operation
 * @point_2: the second point of the ECC point math operation
 *	     (only used for CCP_ECC_FUNCTION_PADD_384BIT)
 * @domain_a: the a parameter of the ECC curve
 * @domain_a_len: the length of the a parameter
 * @scalar: the scalar parameter for the point match operation
 *	    (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 * @scalar_len: the length of the scalar parameter
 *		(only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 * @result: the point resulting from the point math operation
 */
struct ccp_ecc_point_math {
	struct ccp_ecc_point point_1;
	struct ccp_ecc_point point_2;

	struct scatterlist *domain_a;
	unsigned int domain_a_len;	/* In bytes */

	struct scatterlist *scalar;
	unsigned int scalar_len;	/* In bytes */

	struct ccp_ecc_point result;
};

/**
 * struct ccp_ecc_engine - CCP ECC operation
 * @function: ECC function to perform
 * @mod: ECC modulus
 * @mod_len: length in bytes of modulus
 * @mm: module math parameters
 * @pm: point math parameters
 * @ecc_result: result of the ECC operation
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - function, mod, mod_len
 *   - operand, operand_len, operand_count, output, output_len, output_count
 *   - ecc_result
 */
struct ccp_ecc_engine {
	enum ccp_ecc_function function;

	struct scatterlist *mod;
	u32 mod_len;		/* In bytes */

	union {
		struct ccp_ecc_modular_math mm;
		struct ccp_ecc_point_math pm;
	} u;

	u16 ecc_result;
};


/**
 * ccp_engine - CCP operation identifiers
 *
 * @CCP_ENGINE_AES: AES operation
 * @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
 * @CCP_ENGINE_RSVD1: unused
 * @CCP_ENGINE_SHA: SHA operation
 * @CCP_ENGINE_RSA: RSA operation
 * @CCP_ENGINE_PASSTHRU: pass-through operation
 * @CCP_ENGINE_ZLIB_DECOMPRESS: unused
 * @CCP_ENGINE_ECC: ECC operation
 */
enum ccp_engine {
	CCP_ENGINE_AES = 0,
	CCP_ENGINE_XTS_AES_128,
	CCP_ENGINE_DES3,
	CCP_ENGINE_SHA,
	CCP_ENGINE_RSA,
	CCP_ENGINE_PASSTHRU,
	CCP_ENGINE_ZLIB_DECOMPRESS,
	CCP_ENGINE_ECC,
	CCP_ENGINE__LAST,
};

/* Flag values for flags member of ccp_cmd */
#define CCP_CMD_MAY_BACKLOG		0x00000001
#define CCP_CMD_PASSTHRU_NO_DMA_MAP	0x00000002

/**
 * struct ccp_cmd - CCP operation request
 * @entry: list element (ccp driver use only)
 * @work: work element used for callbacks (ccp driver use only)
 * @ccp: CCP device to be run on
 * @ret: operation return code (ccp driver use only)
 * @flags: cmd processing flags
 * @engine: CCP operation to perform
 * @engine_error: CCP engine return code
 * @u: engine specific structures, refer to specific engine struct below
 * @callback: operation completion callback function
 * @data: parameter value to be supplied to the callback function
 *
 * Variables required to be set when calling ccp_enqueue_cmd():
 *   - engine, callback
 *   - See the operation structures below for what is required for each
 *     operation.
 */
struct ccp_cmd {
	/* The list_head, work_struct, ccp and ret variables are for use
	 * by the CCP driver only.
	 */
	struct list_head entry;
	struct work_struct work;
	struct ccp_device *ccp;
	int ret;

	u32 flags;

	enum ccp_engine engine;
	u32 engine_error;

	union {
		struct ccp_aes_engine aes;
		struct ccp_xts_aes_engine xts;
		struct ccp_des3_engine des3;
		struct ccp_sha_engine sha;
		struct ccp_rsa_engine rsa;
		struct ccp_passthru_engine passthru;
		struct ccp_passthru_nomap_engine passthru_nomap;
		struct ccp_ecc_engine ecc;
	} u;

	/* Completion callback support */
	void (*callback)(void *data, int err);
	void *data;
};

#endif