path: root/drivers/crypto/atmel-sha.c

/*
 * Cryptographic API.
 *
 * Support for ATMEL SHA1/SHA256 HW acceleration.
 *
 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
 * Author: Nicolas Royer <nicolas@eukrea.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 omap-sham.c drivers.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/hw_random.h>
#include <linux/platform_device.h>

#include <linux/device.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>
#include <crypto/sha.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <linux/platform_data/crypto-atmel.h>
#include "atmel-sha-regs.h"

/* SHA flags */
#define SHA_FLAGS_BUSY			BIT(0)
#define	SHA_FLAGS_FINAL			BIT(1)
#define SHA_FLAGS_DMA_ACTIVE	BIT(2)
#define SHA_FLAGS_OUTPUT_READY	BIT(3)
#define SHA_FLAGS_INIT			BIT(4)
#define SHA_FLAGS_CPU			BIT(5)
#define SHA_FLAGS_DMA_READY		BIT(6)

#define SHA_FLAGS_FINUP		BIT(16)
#define SHA_FLAGS_SG		BIT(17)
#define SHA_FLAGS_SHA1		BIT(18)
#define SHA_FLAGS_SHA224	BIT(19)
#define SHA_FLAGS_SHA256	BIT(20)
#define SHA_FLAGS_SHA384	BIT(21)
#define SHA_FLAGS_SHA512	BIT(22)
#define SHA_FLAGS_ERROR		BIT(23)
#define SHA_FLAGS_PAD		BIT(24)

#define SHA_OP_UPDATE	1
#define SHA_OP_FINAL	2

#define SHA_BUFFER_LEN		PAGE_SIZE

#define ATMEL_SHA_DMA_THRESHOLD		56

struct atmel_sha_caps {
	bool	has_dma;
	bool	has_dualbuff;
	bool	has_sha224;