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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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