summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/cqhci-crypto.h
blob: d7fb084f563b0e01ac2c42c341ede7bc2842fb61 (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * CQHCI crypto engine (inline encryption) support
 *
 * Copyright 2020 Google LLC
 */

#ifndef LINUX_MMC_CQHCI_CRYPTO_H
#define LINUX_MMC_CQHCI_CRYPTO_H

#include <linux/mmc/host.h>

#include "cqhci.h"

#ifdef CONFIG_MMC_CRYPTO

int cqhci_crypto_init(struct cqhci_host *host);

/*
 * Returns the crypto bits that should be set in bits 64-127 of the
 * task descriptor.
 */
static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
{
	if (!mrq->crypto_ctx)
		return 0;

	/* We set max_dun_bytes_supported=4, so all DUNs should be 32-bit. */
	WARN_ON_ONCE(mrq->crypto_ctx->bc_dun[0] > U32_MAX);

	return CQHCI_CRYPTO_ENABLE_BIT |
	       CQHCI_CRYPTO_KEYSLOT(mrq->crypto_key_slot) |
	       mrq->crypto_ctx->bc_dun[0];
}

#else /* CONFIG_MMC_CRYPTO */

static inline int cqhci_crypto_init(struct cqhci_host *host)
{
	return 0;
}

static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
{
	return 0;
}

#endif /* !CONFIG_MMC_CRYPTO */

#endif /* LINUX_MMC_CQHCI_CRYPTO_H */