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 "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_SHA256	BIT(19)
#define SHA_FLAGS_ERROR		BIT(20)
#define SHA_FLAGS_PAD		BIT(21)

#define SHA_FLAGS_DUALBUFF	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_dev;

struct atmel_sha_reqctx {
	struct atmel_sha_dev	*dd;
	unsigned long	flags;
	unsigned long	op;

	u8	digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
	size_t	digcnt;
	size_t	bufcnt;
	size_t	buflen;
	dma_addr_t	dma_addr;

	/* walk state */
	struct scatterlist	*sg;
	unsigned int	offset;	/* offset in current sg */
	unsigned int	total;	/* total request */

	u8	buffer[0] __aligned(sizeof(u32));
};

struct atmel_sha_ctx {
	struct atmel_sha_dev	*dd;

	unsigned long		flags;

	/* fallback stuff */
	struct crypto_shash	*fallback;

};

#define ATMEL_SHA_QUEUE_LENGTH	1

struct atmel_sha_dev {
	struct list_head	list;
	unsigned long		phys_base;
	struct device		*dev;
	struct clk			*iclk;
	int					irq;
	void __iomem		*io_base;

	spinlock_t		lock;
	int			err;
	struct tasklet_struct	done_task;

	unsigned long		flags;
	struct crypto_queue	queue;
	struct ahash_request	*req;
};

struct atmel_sha_drv {
	struct list_head	dev_list;
	spinlock_t		lock;
};

static struct atmel_sha_drv atmel_sha = {
	.dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
	.lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
};

static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
{
	return readl_relaxed(dd->io_base + offset);
}

static inline void atmel_sha_write(struct atmel_sha_dev *dd,
					u32 offset, u32 value)
{
	writel_relaxed(value, dd->io_base + offset);
}

static void atmel_sha_dualbuff_test(struct atmel_sha_dev *dd)
{
	atmel_sha_write(dd, SHA_MR, SHA_MR_DUALBUFF);

	if (atmel_sha_read(dd, SHA_MR) & SHA_MR_DUALBUFF)
		dd->flags |= SHA_FLAGS_DUALBUFF;
}

static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
{
	size_t count;

	while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
		count = min(ctx->sg->length - ctx->offset, ctx->total);
		count = min(count, ctx->buflen - ctx->bufcnt);

		if (count <= 0)
			break;

		scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
			ctx->offset, count, 0);

		ctx->bufcnt += count;
		ctx->offset += count;
		ctx