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/* 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 */
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