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/*
* Driver for EIP97 cryptographic accelerator.
*
* Copyright (c) 2016 Ryder Lee <ryder.lee@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef __MTK_PLATFORM_H_
#define __MTK_PLATFORM_H_
#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <crypto/skcipher.h>
#include <linux/crypto.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/scatterlist.h>
#include "mtk-regs.h"
#define MTK_RDR_PROC_THRESH BIT(0)
#define MTK_RDR_PROC_MODE BIT(23)
#define MTK_CNT_RST BIT(31)
#define MTK_IRQ_RDR0 BIT(1)
#define MTK_IRQ_RDR1 BIT(3)
#define MTK_IRQ_RDR2 BIT(5)
#define MTK_IRQ_RDR3 BIT(7)
#define SIZE_IN_WORDS(x) ((x) >> 2)
/**
* Ring 0/1 are used by AES encrypt and decrypt.
* Ring 2/3 are used by SHA.
*/
enum {
MTK_RING0,
MTK_RING1,
MTK_RING2,
MTK_RING3,
MTK_RING_MAX
};
#define MTK_REC_NUM (MTK_RING_MAX / 2)
#define MTK_IRQ_NUM 5
/**
* struct mtk_desc - DMA descriptor
* @hdr: the descriptor control header
* @buf: DMA address of input buffer segment
* @ct: DMA address of command token that control operation flow
* @ct_hdr: the command token control header
* @tag: the user-defined field
* @tfm: DMA address of transform state
* @bound: align descriptors offset boundary
*
* Structure passed to the crypto engine to describe where source
* data needs to be fetched and how it needs to be processed.
*/
struct mtk_desc {
__le32 hdr;
__le32 buf;
__le32 ct;
__le32 ct_hdr;
__le32 tag;
__le32 tfm;
__le32 bound[2];
};
#define MTK_DESC_NUM 512
#define MTK_DESC_OFF SIZE_IN_WORDS(sizeof(struct mtk_desc))
#define MTK_DESC_SZ (MTK_DESC_OFF - 2)
#define MTK_DESC_RING_SZ ((sizeof(struct mtk_desc) * MTK_DESC_NUM))
#define MTK_DESC_CNT(x) ((MTK_DESC_OFF * (x)) << 2)
#define MTK_DESC_LAST cpu_to_le32(BIT(22))
#define MTK_DESC_FIRST cpu_to_le32(BIT(23))
#define MTK_DESC_BUF_LEN(x) cpu_to_le32(x)
#define MTK_DESC_CT_LEN(x) cpu_to_le32((x) << 24)
/**
* struct mtk_ring - Descriptor ring
* @cmd_base: pointer to command descriptor ring base
* @cmd_dma: DMA address of command descriptor ring
* @cmd_pos: current position in the command descriptor ring
* @res_base: pointer to result descriptor ring base
* @res_dma: DMA address of result descriptor ring
* @res_pos: current position in the result descriptor ring
*
* A descriptor ring is a circular buffer that is used to manage
* one or more descriptors. There are two type of descriptor rings;
* the command descriptor ring and result descriptor ring.
*/
struct mtk_ring {
struct mtk_desc *cmd_base;
dma_addr_t cmd_dma;
u32 cmd_pos;
struct mtk_desc *res_base;
dma_addr_t res_dma;
u32 res_pos;
};
/**
* struct mtk_aes_dma - Structure that holds sg list info
* @sg: pointer to scatter-gather list
* @nents: number of entries in the sg list
* @remainder: remainder of sg list
* @sg_len: number of entries in the sg mapped list
*/
struct mtk_aes_dma {
struct scatterlist *sg;
int nents;
u32 remainder;
u32 sg_len;
};
struct mtk_aes_base_ctx;
struct mtk_aes_rec;
struct mtk_cryp;
typedef int (*mtk_aes_fn)(struct mtk_cryp *cryp, struct mtk_aes_rec *aes);
/**
* struct mtk_aes_rec - AES operation record
* @cryp: pointer to Cryptographic device
* @queue: crypto request queue
* @areq: pointer to async request
* @task: the tasklet is use in AES interrupt
* @ctx: pointer to current context
* @src: the structure that holds source sg list info
* @dst: the structure that holds destination sg list info
* @aligned_sg: the scatter list is use to alignment
* @real_dst: pointer to the destination sg list
* @resume: pointer to resume function
* @total: request buffer length
* @buf: pointer to page buffer
* @id: the current use of ring
* @flags: it's describing AES operation state
* @lock: the async queue lock
*
* Structure used to record AES execution state.
*/
struct mtk_aes_rec {
struct mtk_cryp *cryp;
struct crypto_queue queue;
struct crypto_async_request *areq;
struct tasklet_struct task;
struct mtk_aes_base_ctx *ctx;
struct mtk_aes_dma src;
struct mtk_aes_dma dst;
struct scatterlist aligned_sg;
struct scatterlist *real_dst;
mtk_aes_fn resume;
size_t total;
void *buf;
u8 id;
unsigned long flags;
/* queue lock */
spinlock_t lock;
};
/**
* struct mtk_sha_rec - SHA operation record
* @cryp: pointer to Cryptographic device
* @queue: crypto request queue
* @req: pointer to ahash request
* @task: the tasklet is use in SHA interrupt
* @id: the current use of ring
* @flags: it's describing SHA operation state
* @lock: the async queue lock
*
* Structure used to record SHA execution state.
*/
struct mtk_sha_rec {
struct mtk_cryp *cryp;
struct crypto_queue queue;
struct ahash_request *req;
struct tasklet_struct task;
u8 id;
unsigned long flags;
/* queue lock */
spinlock_t lock;
};
/**
* struct mtk_cryp - Cryptographic device
* @base: pointer to mapped register I/O base
* @dev: pointer to device
* @clk_ethif: pointer to ethif clock
* @clk_cryp: pointer to crypto clock
* @irq: global system and rings IRQ
* @ring: pointer to descriptor rings
* @aes: pointer to operation record of AES
* @sha: pointer to operation record of SHA
* @aes_list: device list of AES
* @sha_list: device list of SHA
* @rec: it's used to select SHA record for tfm
*
* Structure storing cryptographic device information.
*/
struct mtk_cryp {
void __iomem *base;
struct device *dev;
struct clk *clk_ethif;
struct clk *clk_cryp;
int irq[MTK_IRQ_NUM];
struct mtk_ring *ring[MTK_RING_MAX];
struct mtk_aes_rec *aes[MTK_REC_NUM];
struct mtk_sha_rec *sha[MTK_REC_NUM];
struct list_head aes_list;
struct list_head sha_list;
bool rec;
};
int mtk_cipher_alg_register(struct mtk_cryp *cryp);
void mtk_cipher_alg_release(struct mtk_cryp *cryp);
int mtk_hash_alg_register(struct mtk_cryp *cryp);
void mtk_hash_alg_release(struct mtk_cryp *cryp);
#endif /* __MTK_PLATFORM_H_ */
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