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 */ 51