/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* CQHCI crypto engine (inline encryption) support
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*
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* Copyright 2020 Google LLC
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*/
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#ifndef LINUX_MMC_CQHCI_CRYPTO_H
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#define LINUX_MMC_CQHCI_CRYPTO_H
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#include <linux/mmc/host.h>
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#include "cqhci.h"
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#ifdef CONFIG_MMC_CRYPTO
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int cqhci_crypto_init(struct cqhci_host *host);
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/*
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* Returns the crypto bits that should be set in bits 64-127 of the
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* task descriptor.
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*/
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static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
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{
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if (!mrq->crypto_ctx)
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return 0;
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/* We set max_dun_bytes_supported=4, so all DUNs should be 32-bit. */
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WARN_ON_ONCE(mrq->crypto_ctx->bc_dun[0] > U32_MAX);
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return CQHCI_CRYPTO_ENABLE_BIT |
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CQHCI_CRYPTO_KEYSLOT(mrq->crypto_key_slot) |
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mrq->crypto_ctx->bc_dun[0];
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}
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#else /* CONFIG_MMC_CRYPTO */
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static inline int cqhci_crypto_init(struct cqhci_host *host)
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{
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return 0;
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}
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static inline u64 cqhci_crypto_prep_task_desc(struct mmc_request *mrq)
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{
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return 0;
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}
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#endif /* !CONFIG_MMC_CRYPTO */
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#endif /* LINUX_MMC_CQHCI_CRYPTO_H */
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