xref: /linux/include/linux/ccp.h (revision 905e46acd3272d04566fec49afbd7ad9e2ed9ae3)
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
669