1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/mmc/host/cqhci-crypto.h b/drivers/mmc/host/cqhci-crypto.h
new file mode 100644
index 000000000..d7fb084f5
--- /dev/null
+++ b/drivers/mmc/host/cqhci-crypto.h
@@ -0,0 +1,50 @@
+/* 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 */