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a09c5e0649
AES-CCM is an AEAD algorithm supporting both encryption and authentication of data. This patch introduces support for AES-CCM AEAD algorithm in the DTHEv2 driver. Signed-off-by: T Pratham <t-pratham@ti.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* K3 DTHE V2 crypto accelerator driver
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*
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* Copyright (C) Texas Instruments 2025 - https://www.ti.com
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* Author: T Pratham <t-pratham@ti.com>
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*/
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#ifndef __TI_DTHEV2_H__
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#define __TI_DTHEV2_H__
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#include <crypto/aead.h>
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <crypto/engine.h>
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#include <crypto/hash.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dmapool.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/scatterlist.h>
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#define DTHE_REG_SIZE 4
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#define DTHE_DMA_TIMEOUT_MS 2000
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/*
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* Size of largest possible key (of all algorithms) to be stored in dthe_tfm_ctx
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* This is currently the keysize of XTS-AES-256 which is 512 bits (64 bytes)
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*/
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#define DTHE_MAX_KEYSIZE (AES_MAX_KEY_SIZE * 2)
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enum dthe_aes_mode {
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DTHE_AES_ECB = 0,
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DTHE_AES_CBC,
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DTHE_AES_CTR,
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DTHE_AES_XTS,
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DTHE_AES_GCM,
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DTHE_AES_CCM,
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};
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/* Driver specific struct definitions */
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/**
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* struct dthe_data - DTHE_V2 driver instance data
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* @dev: Device pointer
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* @regs: Base address of the register space
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* @list: list node for dev
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* @engine: Crypto engine instance
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* @dma_aes_rx: AES Rx DMA Channel
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* @dma_aes_tx: AES Tx DMA Channel
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* @dma_sha_tx: SHA Tx DMA Channel
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*/
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struct dthe_data {
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struct device *dev;
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void __iomem *regs;
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struct list_head list;
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struct crypto_engine *engine;
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struct dma_chan *dma_aes_rx;
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struct dma_chan *dma_aes_tx;
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struct dma_chan *dma_sha_tx;
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};
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/**
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* struct dthe_list - device data list head
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* @dev_list: linked list head
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* @lock: Spinlock protecting accesses to the list
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*/
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struct dthe_list {
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struct list_head dev_list;
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spinlock_t lock;
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};
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/**
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* struct dthe_tfm_ctx - Transform ctx struct containing ctx for all sub-components of DTHE V2
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* @dev_data: Device data struct pointer
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* @keylen: AES key length
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* @authsize: Authentication size for modes with authentication
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* @key: AES key
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* @aes_mode: AES mode
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* @aead_fb: Fallback crypto aead handle
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* @skcipher_fb: Fallback crypto skcipher handle for AES-XTS mode
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*/
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struct dthe_tfm_ctx {
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struct dthe_data *dev_data;
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unsigned int keylen;
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unsigned int authsize;
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u32 key[DTHE_MAX_KEYSIZE / sizeof(u32)];
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enum dthe_aes_mode aes_mode;
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union {
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struct crypto_sync_aead *aead_fb;
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struct crypto_sync_skcipher *skcipher_fb;
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};
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};
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/**
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* struct dthe_aes_req_ctx - AES engine req ctx struct
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* @enc: flag indicating encryption or decryption operation
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* @padding: padding buffer for handling unaligned data
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* @aes_compl: Completion variable for use in manual completion in case of DMA callback failure
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*/
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struct dthe_aes_req_ctx {
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int enc;
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u8 padding[2 * AES_BLOCK_SIZE];
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struct completion aes_compl;
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};
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/* Struct definitions end */
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struct dthe_data *dthe_get_dev(struct dthe_tfm_ctx *ctx);
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/**
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* dthe_copy_sg - Copy sg entries from src to dst
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* @dst: Destination sg to be filled
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* @src: Source sg to be copied from
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* @buflen: Number of bytes to be copied
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*
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* Description:
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* Copy buflen bytes of data from src to dst.
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*
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**/
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struct scatterlist *dthe_copy_sg(struct scatterlist *dst,
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struct scatterlist *src,
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int buflen);
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int dthe_register_aes_algs(void);
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void dthe_unregister_aes_algs(void);
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#endif
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