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

/*
 * Cryptographic API.
 *
 * Support for ATMEL AES 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-aes.c driver.
 */


#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/of_device.h>
#include <linux/delay.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <linux/platform_data/crypto-atmel.h>
#include <dt-bindings/dma/at91.h>
#include "atmel-aes-regs.h"

#define CFB8_BLOCK_SIZE		1
#define CFB16_BLOCK_SIZE	2
#define CFB32_BLOCK_SIZE	4
#define CFB64_BLOCK_SIZE	8

/* AES flags */
#define AES_FLAGS_MODE_MASK	0x03ff
#define AES_FLAGS_ENCRYPT	BIT(0)
#define AES_FLAGS_CBC		BIT(1)
#define AES_FLAGS_CFB		BIT(2)
#define AES_FLAGS_CFB8		BIT(3)
#define AES_FLAGS_CFB16		BIT(4)
#define AES_FLAGS_CFB32		BIT(5)
#define AES_FLAGS_CFB64		BIT(6)
#define AES_FLAGS_CFB128	BIT(7)
#define AES_FLAGS_OFB		BIT(8)
#define AES_FLAGS_CTR		BIT(9)

#define AES_FLAGS_INIT		BIT(16)
#define AES_FLAGS_DMA		BIT(17)
#define AES_FLAGS_BUSY		BIT(18)
#define AES_FLAGS_FAST		BIT(19)

#define ATMEL_AES_QUEUE_LENGTH	50

#define ATMEL_AES_DMA_THRESHOLD		16


struct atmel_aes_caps {
	bool	has_dualbuff;
	bool	has_cfb64;
	u32		max_burst_size;
};

struct atmel_aes_dev;

struct atmel_aes_ctx {
	struct atmel_aes_dev *dd;

	int		keylen;
	u32		key[