xref: /linux/drivers/mmc/host/cqhci-crypto.h (revision 762f99f4f3cb41a775b5157dd761217beba65873)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * CQHCI crypto engine (inline encryption) support
4  *
5  * Copyright 2020 Google LLC
6  */
7 
8 #ifndef LINUX_MMC_CQHCI_CRYPTO_H
9 #define LINUX_MMC_CQHCI_CRYPTO_H
10 
11 #include <linux/mmc/host.h>
12 
13 #include "cqhci.h"
14 
15 #ifdef CONFIG_MMC_CRYPTO
16 
17 int cqhci_crypto_init(struct cqhci_host *host);
18 
19 /*
20  * Returns the crypto bits that should be set in bits 64-127 of the
21  * task descriptor.
22  */
cqhci_crypto_prep_task_desc(struct mmc_request * mrq)23 static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
24 {
25 	if (!mrq->crypto_ctx)
26 		return 0;
27 
28 	/* We set max_dun_bytes_supported=4, so all DUNs should be 32-bit. */
29 	WARN_ON_ONCE(mrq->crypto_ctx->bc_dun[0] > U32_MAX);
30 
31 	return CQHCI_CRYPTO_ENABLE_BIT |
32 	       CQHCI_CRYPTO_KEYSLOT(mrq->crypto_key_slot) |
33 	       mrq->crypto_ctx->bc_dun[0];
34 }
35 
36 #else /* CONFIG_MMC_CRYPTO */
37 
cqhci_crypto_init(struct cqhci_host * host)38 static inline int cqhci_crypto_init(struct cqhci_host *host)
39 {
40 	return 0;
41 }
42 
cqhci_crypto_prep_task_desc(struct mmc_request * mrq)43 static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
44 {
45 	return 0;
46 }
47 
48 #endif /* !CONFIG_MMC_CRYPTO */
49 
50 #endif /* LINUX_MMC_CQHCI_CRYPTO_H */
51