1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Intel Keem Bay OCS AES Crypto Driver.
  4 *
  5 * Copyright (C) 2018-2020 Intel Corporation
  6 */
  7
  8#ifndef _CRYPTO_OCS_AES_H
  9#define _CRYPTO_OCS_AES_H
 10
 11#include <linux/dma-mapping.h>
 12
 13enum ocs_cipher {
 14	OCS_AES = 0,
 15	OCS_SM4 = 1,
 16};
 17
 18enum ocs_mode {
 19	OCS_MODE_ECB = 0,
 20	OCS_MODE_CBC = 1,
 21	OCS_MODE_CTR = 2,
 22	OCS_MODE_CCM = 6,
 23	OCS_MODE_GCM = 7,
 24	OCS_MODE_CTS = 9,
 25};
 26
 27enum ocs_instruction {
 28	OCS_ENCRYPT = 0,
 29	OCS_DECRYPT = 1,
 30	OCS_EXPAND  = 2,
 31	OCS_BYPASS  = 3,
 32};
 33
 34/**
 35 * struct ocs_aes_dev - AES device context.
 36 * @list:			List head for insertion into device list hold
 37 *				by driver.
 38 * @dev:			OCS AES device.
 39 * @irq:			IRQ number.
 40 * @base_reg:			IO base address of OCS AES.
 41 * @irq_copy_completion:	Completion to indicate IRQ has been triggered.
 42 * @dma_err_mask:		Error reported by OCS DMA interrupts.
 43 * @engine:			Crypto engine for the device.
 44 */
 45struct ocs_aes_dev {
 46	struct list_head list;
 47	struct device *dev;
 48	int irq;
 49	void __iomem *base_reg;
 50	struct completion irq_completion;
 51	u32 dma_err_mask;
 52	struct crypto_engine *engine;
 53};
 54
 55/**
 56 * struct ocs_dll_desc - Descriptor of an OCS DMA Linked List.
 57 * @vaddr:	Virtual address of the linked list head.
 58 * @dma_addr:	DMA address of the linked list head.
 59 * @size:	Size (in bytes) of the linked list.
 60 */
 61struct ocs_dll_desc {
 62	void		*vaddr;
 63	dma_addr_t	dma_addr;
 64	size_t		size;
 65};
 66
 67int ocs_aes_set_key(struct ocs_aes_dev *aes_dev, const u32 key_size,
 68		    const u8 *key, const enum ocs_cipher cipher);
 69
 70int ocs_aes_op(struct ocs_aes_dev *aes_dev,
 71	       enum ocs_mode mode,
 72	       enum ocs_cipher cipher,
 73	       enum ocs_instruction instruction,
 74	       dma_addr_t dst_dma_list,
 75	       dma_addr_t src_dma_list,
 76	       u32 src_size,
 77	       u8 *iv,
 78	       u32 iv_size);
 79
 80/**
 81 * ocs_aes_bypass_op() - Use OCS DMA to copy data.
 82 * @aes_dev:            The OCS AES device to use.
 83 * @dst_dma_list:	The OCS DMA list mapping the memory where input data
 84 *			will be copied to.
 85 * @src_dma_list:	The OCS DMA list mapping input data.
 86 * @src_size:		The amount of data to copy.
 87 */
 88static inline int ocs_aes_bypass_op(struct ocs_aes_dev *aes_dev,
 89				    dma_addr_t dst_dma_list,
 90				    dma_addr_t src_dma_list, u32 src_size)
 91{
 92	return ocs_aes_op(aes_dev, OCS_MODE_ECB, OCS_AES, OCS_BYPASS,
 93			  dst_dma_list, src_dma_list, src_size, NULL, 0);
 94}
 95
 96int ocs_aes_gcm_op(struct ocs_aes_dev *aes_dev,
 97		   enum ocs_cipher cipher,
 98		   enum ocs_instruction instruction,
 99		   dma_addr_t dst_dma_list,
100		   dma_addr_t src_dma_list,
101		   u32 src_size,
102		   const u8 *iv,
103		   dma_addr_t aad_dma_list,
104		   u32 aad_size,
105		   u8 *out_tag,
106		   u32 tag_size);
107
108int ocs_aes_ccm_op(struct ocs_aes_dev *aes_dev,
109		   enum ocs_cipher cipher,
110		   enum ocs_instruction instruction,
111		   dma_addr_t dst_dma_list,
112		   dma_addr_t src_dma_list,
113		   u32 src_size,
114		   u8 *iv,
115		   dma_addr_t adata_dma_list,
116		   u32 adata_size,
117		   u8 *in_tag,
118		   u32 tag_size);
119
120int ocs_create_linked_list_from_sg(const struct ocs_aes_dev *aes_dev,
121				   struct scatterlist *sg,
122				   int sg_dma_count,
123				   struct ocs_dll_desc *dll_desc,
124				   size_t data_size,
125				   size_t data_offset);
126
127irqreturn_t ocs_aes_irq_handler(int irq, void *dev_id);
128
129#endif