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/* SPDX-License-Identifier: GPL-2.0-only */
* Intel Keem Bay OCS HCU Crypto Driver.
* Copyright (C) 2018-2020 Intel Corporation
#include <linux/dma-mapping.h>
#define OCS_HCU_HW_KEY_LEN 64
struct ocs_hcu_dma_list;
enum ocs_hcu_algo {
* struct ocs_hcu_dev - OCS HCU device context.
* @list: List of device contexts.
* @dev: OCS HCU device.
* @io_base: Base address of OCS HCU registers.
* @engine: Crypto engine for the device.
* @irq: IRQ number.
* @irq_done: Completion for IRQ.
* @irq_err: Flag indicating an IRQ error has happened.
struct ocs_hcu_dev {
struct list_head list;
struct device *dev;
void __iomem *io_base;
struct crypto_engine *engine;
int irq;
struct completion irq_done;
bool irq_err;
* struct ocs_hcu_idata - Intermediate data generated by the HCU.
* @msg_len_lo: Length of data the HCU has operated on in bits, low 32b.
* @msg_len_hi: Length of data the HCU has operated on in bits, high 32b.
* @digest: The digest read from the HCU. If the HCU is terminated, it will
* contain the actual hash digest. Otherwise it is the intermediate
* state.
struct ocs_hcu_idata {
u32 msg_len_lo;
u32 msg_len_hi;
u8 digest[SHA512_DIGEST_SIZE];
* struct ocs_hcu_hash_ctx - Context for OCS HCU hashing operation.
* @algo: The hashing algorithm being used.
* @idata: The current intermediate data.
struct ocs_hcu_hash_ctx {
enum ocs_hcu_algo algo;
struct ocs_hcu_idata idata;
irqreturn_t ocs_hcu_irq_handler(int irq, void *dev_id);
struct ocs_hcu_dma_list *ocs_hcu_dma_list_alloc(struct ocs_hcu_dev *hcu_dev,
int max_nents);
void ocs_hcu_dma_list_free(struct ocs_hcu_dev *hcu_dev,
struct ocs_hcu_dma_list *dma_list);
int ocs_hcu_dma_list_add_tail(struct ocs_hcu_dev *hcu_dev,
struct ocs_hcu_dma_list *dma_list,
dma_addr_t addr, u32 len);
int ocs_hcu_hash_init(struct ocs_hcu_hash_ctx *ctx, enum ocs_hcu_algo algo);
int ocs_hcu_hash_update(struct ocs_hcu_dev *hcu_dev,
struct ocs_hcu_hash_ctx *ctx,
const struct ocs_hcu_dma_list *dma_list);
int ocs_hcu_hash_finup(struct ocs_hcu_dev *hcu_dev,
const struct ocs_hcu_hash_ctx *ctx,
const struct ocs_hcu_dma_list *dma_list,
u8 *dgst, size_t dgst_len);
int ocs_hcu_hash_final(struct ocs_hcu_dev *hcu_dev,
const struct ocs_hcu_hash_ctx *ctx, u8 *dgst,
size_t dgst_len);
int ocs_hcu_digest(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo,
void *data, size_t data_len, u8 *dgst, size_t dgst_len);
int ocs_hcu_hmac(struct ocs_hcu_dev *hcu_dev, enum ocs_hcu_algo algo,
const u8 *key, size_t key_len,
const struct ocs_hcu_dma_list *dma_list,
u8 *dgst, size_t dgst_len);
#endif /* _CRYPTO_OCS_HCU_H */