drivers/mmc/host/cqhci-crypto.h

   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  */
  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
  38 static inline int cqhci_crypto_init(struct cqhci_host *host)
  39 {
  40         return 0;
  41 }
  42
  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 */