path: root/drivers/crypto/mediatek/mtk-sha.c

/*
 * Cryptographic API.
 *
 * Driver for EIP97 SHA1/SHA2(HMAC) acceleration.
 *
 * 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.
 *
 * Some ideas are from atmel-sha.c and omap-sham.c drivers.
 */

#include <crypto/sha.h>
#include "mtk-platform.h"

#define SHA_ALIGN_MSK		(sizeof(u32) - 1)
#define SHA_QUEUE_SIZE		512
#define SHA_TMP_BUF_SIZE	512
#define SHA_BUF_SIZE		((u32)PAGE_SIZE)

#define SHA_OP_UPDATE		1
#define SHA_OP_FINAL		2

#define SHA_DATA_LEN_MSK	cpu_to_le32(GENMASK(16, 0))

/* SHA command token */
#define SHA_CT_SIZE		5
#define SHA_CT_CTRL_HDR		cpu_to_le32(0x02220000)
#define SHA_CMD0		cpu_to_le32(0x03020000)
#define SHA_CMD1		cpu_to_le32(0x21060000)
#define SHA_CMD2		cpu_to_le32(0xe0e63802)

/* SHA transform information */
#define SHA_TFM_HASH		cpu_to_le32(0x2 << 0)
#define SHA_TFM_INNER_DIG	cpu_to_le32(0x1 << 21)
#define SHA_TFM_SIZE(x)		cpu_to_le32((x) << 8)
#define SHA_TFM_START		cpu_to_le32(0x1 << 4)
#define SHA_TFM_CONTINUE	cpu_to_le32(0x1 << 5)
#define SHA_TFM_HASH_STORE	cpu_to_le32(0x1 << 19)
#define SHA_TFM_SHA1		cpu_to_le32(0x2 << 23)
#define SHA_TFM_SHA256		cpu_to_le32(0x3 << 23)
#define SHA_TFM_SHA224		cpu_to_le32(0x4 << 23)
#define SHA_TFM_SHA512		cpu_to_le32(0x5 << 23)
#define SHA_TFM_SHA384		cpu_to_le32(0x6 << 23)
#define SHA_TFM_DIGEST(x)	cpu_to_le32(((x) & GENMASK(3, 0)) << 24)

/* SHA flags */
#define SHA_FLAGS_BUSY		BIT(0)
#define	SHA_FLAGS_FINAL		BIT(1)
#define SHA_FLAGS_FINUP		BIT(2)
#define SHA_FLAGS_SG		BIT(3)
#define SHA_FLAGS_ALGO_MSK	GENMASK(8, 4)
#define SHA_FLAGS_SHA1		BIT(4)
#define SHA_FLAGS_SHA224	BIT(5)
#define SHA_FLAGS_SHA256	BIT(6)
#define SHA_FLAGS_SHA384	BIT(7)
#define SHA_FLAGS_SHA512	BIT(8)
#define SHA_FLAGS_HMAC		BIT(9)
#define SHA_FLAGS_PAD		BIT(10)

/**
 * mtk_sha_ct is a set of hardware instructions(command token)
 * that are used to control engine's processing flow of SHA,
 * and it contains the first two words of transform state.
 */
struct mtk_sha_ct {
	__le32 ctrl[2];
	__le32 cmd[3];
};

/**
 * mtk_sha_tfm is used to define SHA transform state
 * and store result digest that produced by engine.
 */
struct mtk_sha_tfm {
	__le32 ctrl[2];
	__le32 digest[SIZE_IN_WORDS(SHA512_DIGEST_SIZE)];
};

/**
 * mtk_sha_info consists of command token and transform state
 * of SHA, its role is similar to mtk_aes_info.
 */
struct mtk_sha_info {
	struct mtk_sha_ct ct;
	struct mtk_sha_tfm tfm;
};

struct mtk_sha_reqctx {
	struct mtk_sha_info info;
	unsigned long flags;
	unsigned long op;

	u64 digcnt;
	bool start;
	size_t bufcnt;
	dma_addr_t dma_addr;

	__le32 ct_hdr;
	u32 ct_size;
	dma_addr_t ct_dma;
	dma_addr_t tfm_dma;

	/* Walk state */
	struct scatterlist *sg;
	u32 offset;	/* Offset in current sg */
	u32 total;	/* Total request */