Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2703 insertions, 0 deletions

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
new file mode 100644
index 000000000..886bf2585
--- /dev/null
+++ b/drivers/crypto/atmel-aes.c
@@ -0,0 +1,2703 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cryptographic API.
+ *
+ * Support for ATMEL AES HW acceleration.
+ *
+ * Copyright (c) 2012 Eukréa Electromatique - ATMEL
+ * Author: Nicolas Royer <nicolas@eukrea.com>
+ *
+ * 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/dmaengine.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 <crypto/scatterwalk.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/gcm.h>
+#include <crypto/xts.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include "atmel-aes-regs.h"
+#include "atmel-authenc.h"
+
+#define ATMEL_AES_PRIORITY	300
+
+#define ATMEL_AES_BUFFER_ORDER	2
+#define ATMEL_AES_BUFFER_SIZE	(PAGE_SIZE << ATMEL_AES_BUFFER_ORDER)
+
+#define CFB8_BLOCK_SIZE		1
+#define CFB16_BLOCK_SIZE	2
+#define CFB32_BLOCK_SIZE	4
+#define CFB64_BLOCK_SIZE	8
+
+#define SIZE_IN_WORDS(x)	((x) >> 2)
+
+/* AES flags */
+/* Reserve bits [18:16] [14:12] [1:0] for mode (same as for AES_MR) */
+#define AES_FLAGS_ENCRYPT	AES_MR_CYPHER_ENC
+#define AES_FLAGS_GTAGEN	AES_MR_GTAGEN
+#define AES_FLAGS_OPMODE_MASK	(AES_MR_OPMOD_MASK | AES_MR_CFBS_MASK)
+#define AES_FLAGS_ECB		AES_MR_OPMOD_ECB
+#define AES_FLAGS_CBC		AES_MR_OPMOD_CBC
+#define AES_FLAGS_OFB		AES_MR_OPMOD_OFB
+#define AES_FLAGS_CFB128	(AES_MR_OPMOD_CFB | AES_MR_CFBS_128b)
+#define AES_FLAGS_CFB64		(AES_MR_OPMOD_CFB | AES_MR_CFBS_64b)
+#define AES_FLAGS_CFB32		(AES_MR_OPMOD_CFB | AES_MR_CFBS_32b)
+#define AES_FLAGS_CFB16		(AES_MR_OPMOD_CFB | AES_MR_CFBS_16b)
+#define AES_FLAGS_CFB8		(AES_MR_OPMOD_CFB | AES_MR_CFBS_8b)
+#define AES_FLAGS_CTR		AES_MR_OPMOD_CTR
+#define AES_FLAGS_GCM		AES_MR_OPMOD_GCM
+#define AES_FLAGS_XTS		AES_MR_OPMOD_XTS
+
+#define AES_FLAGS_MODE_MASK	(AES_FLAGS_OPMODE_MASK |	\
+				 AES_FLAGS_ENCRYPT |		\
+				 AES_FLAGS_GTAGEN)
+
+#define AES_FLAGS_BUSY		BIT(3)
+#define AES_FLAGS_DUMP_REG	BIT(4)
+#define AES_FLAGS_OWN_SHA	BIT(5)
+
+#define AES_FLAGS_PERSISTENT	AES_FLAGS_BUSY
+
+#define ATMEL_AES_QUEUE_LENGTH	50
+
+#define ATMEL_AES_DMA_THRESHOLD		256
+
+
+struct atmel_aes_caps {
+	bool			has_dualbuff;
+	bool			has_cfb64;
+	bool			has_gcm;
+	bool			has_xts;
+	bool			has_authenc;
+	u32			max_burst_size;
+};
+
+struct atmel_aes_dev;
+
+
+typedef int (*atmel_aes_fn_t)(struct atmel_aes_dev *);
+
+
+struct atmel_aes_base_ctx {
+	struct atmel_aes_dev	*dd;
+	atmel_aes_fn_t		start;
+	int			keylen;
+	u32			key[AES_KEYSIZE_256 / sizeof(u32)];
+	u16			block_size;
+	bool			is_aead;
+};
+
+struct atmel_aes_ctx {
+	struct atmel_aes_base_ctx	base;
+};
+
+struct atmel_aes_ctr_ctx {
+	struct atmel_aes_base_ctx	base;
+
+	__be32			iv[AES_BLOCK_SIZE / sizeof(u32)];
+	size_t			offset;
+	struct scatterlist	src[2];
+	struct scatterlist	dst[2];
+	u32			blocks;
+};
+
+struct atmel_aes_gcm_ctx {
+	struct atmel_aes_base_ctx	base;
+
+	struct scatterlist	src[2];
+	struct scatterlist	dst[2];
+
+	__be32			j0[AES_BLOCK_SIZE / sizeof(u32)];
+	u32			tag[AES_BLOCK_SIZE / sizeof(u32)];
+	__be32			ghash[AES_BLOCK_SIZE / sizeof(u32)];
+	size_t			textlen;
+
+	const __be32		*ghash_in;
+	__be32			*ghash_out;
+	atmel_aes_fn_t		ghash_resume;
+};
+
+struct atmel_aes_xts_ctx {
+	struct atmel_aes_base_ctx	base;
+
+	u32			key2[AES_KEYSIZE_256 / sizeof(u32)];
+	struct crypto_skcipher *fallback_tfm;
+};
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+struct atmel_aes_authenc_ctx {
+	struct atmel_aes_base_ctx	base;
+	struct atmel_sha_authenc_ctx	*auth;
+};
+#endif
+
+struct atmel_aes_reqctx {
+	unsigned long		mode;
+	u8			lastc[AES_BLOCK_SIZE];
+	struct skcipher_request fallback_req;
+};
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+struct atmel_aes_authenc_reqctx {
+	struct atmel_aes_reqctx	base;
+
+	struct scatterlist	src[2];
+	struct scatterlist	dst[2];
+	size_t			textlen;
+	u32			digest[SHA512_DIGEST_SIZE / sizeof(u32)];
+
+	/* auth_req MUST be place last. */
+	struct ahash_request	auth_req;
+};
+#endif
+
+struct atmel_aes_dma {
+	struct dma_chan		*chan;
+	struct scatterlist	*sg;
+	int			nents;
+	unsigned int		remainder;
+	unsigned int		sg_len;
+};
+
+struct atmel_aes_dev {
+	struct list_head	list;
+	unsigned long		phys_base;
+	void __iomem		*io_base;
+
+	struct crypto_async_request	*areq;
+	struct atmel_aes_base_ctx	*ctx;
+
+	bool			is_async;
+	atmel_aes_fn_t		resume;
+	atmel_aes_fn_t		cpu_transfer_complete;
+
+	struct device		*dev;
+	struct clk		*iclk;
+	int			irq;
+
+	unsigned long		flags;
+
+	spinlock_t		lock;
+	struct crypto_queue	queue;
+
+	struct tasklet_struct	done_task;
+	struct tasklet_struct	queue_task;
+
+	size_t			total;
+	size_t			datalen;
+	u32			*data;
+
+	struct atmel_aes_dma	src;
+	struct atmel_aes_dma	dst;
+
+	size_t			buflen;
+	void			*buf;
+	struct scatterlist	aligned_sg;
+	struct scatterlist	*real_dst;
+
+	struct atmel_aes_caps	caps;
+
+	u32			hw_version;
+};
+
+struct atmel_aes_drv {
+	struct list_head	dev_list;
+	spinlock_t		lock;
+};
+
+static struct atmel_aes_drv atmel_aes = {
+	.dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
+	.lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
+};
+
+#ifdef VERBOSE_DEBUG
+static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz)
+{
+	switch (offset) {
+	case AES_CR:
+		return "CR";
+
+	case AES_MR:
+		return "MR";
+
+	case AES_ISR:
+		return "ISR";
+
+	case AES_IMR:
+		return "IMR";
+
+	case AES_IER:
+		return "IER";
+
+	case AES_IDR:
+		return "IDR";
+
+	case AES_KEYWR(0):
+	case AES_KEYWR(1):
+	case AES_KEYWR(2):
+	case AES_KEYWR(3):
+	case AES_KEYWR(4):
+	case AES_KEYWR(5):
+	case AES_KEYWR(6):
+	case AES_KEYWR(7):
+		snprintf(tmp, sz, "KEYWR[%u]", (offset - AES_KEYWR(0)) >> 2);
+		break;
+
+	case AES_IDATAR(0):
+	case AES_IDATAR(1):
+	case AES_IDATAR(2):
+	case AES_IDATAR(3):
+		snprintf(tmp, sz, "IDATAR[%u]", (offset - AES_IDATAR(0)) >> 2);
+		break;
+
+	case AES_ODATAR(0):
+	case AES_ODATAR(1):
+	case AES_ODATAR(2):
+	case AES_ODATAR(3):
+		snprintf(tmp, sz, "ODATAR[%u]", (offset - AES_ODATAR(0)) >> 2);
+		break;
+
+	case AES_IVR(0):
+	case AES_IVR(1):
+	case AES_IVR(2):
+	case AES_IVR(3):
+		snprintf(tmp, sz, "IVR[%u]", (offset - AES_IVR(0)) >> 2);
+		break;
+
+	case AES_AADLENR:
+		return "AADLENR";
+
+	case AES_CLENR:
+		return "CLENR";
+
+	case AES_GHASHR(0):
+	case AES_GHASHR(1):
+	case AES_GHASHR(2):
+	case AES_GHASHR(3):
+		snprintf(tmp, sz, "GHASHR[%u]", (offset - AES_GHASHR(0)) >> 2);
+		break;
+
+	case AES_TAGR(0):
+	case AES_TAGR(1):
+	case AES_TAGR(2):
+	case AES_TAGR(3):
+		snprintf(tmp, sz, "TAGR[%u]", (offset - AES_TAGR(0)) >> 2);
+		break;
+
+	case AES_CTRR:
+		return "CTRR";
+
+	case AES_GCMHR(0):
+	case AES_GCMHR(1):
+	case AES_GCMHR(2):
+	case AES_GCMHR(3):
+		snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2);
+		break;
+
+	case AES_EMR:
+		return "EMR";
+
+	case AES_TWR(0):
+	case AES_TWR(1):
+	case AES_TWR(2):
+	case AES_TWR(3):
+		snprintf(tmp, sz, "TWR[%u]", (offset - AES_TWR(0)) >> 2);
+		break;
+
+	case AES_ALPHAR(0):
+	case AES_ALPHAR(1):
+	case AES_ALPHAR(2):
+	case AES_ALPHAR(3):
+		snprintf(tmp, sz, "ALPHAR[%u]", (offset - AES_ALPHAR(0)) >> 2);
+		break;
+
+	default:
+		snprintf(tmp, sz, "0x%02x", offset);
+		break;
+	}
+
+	return tmp;
+}
+#endif /* VERBOSE_DEBUG */
+
+/* Shared functions */
+
+static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
+{
+	u32 value = readl_relaxed(dd->io_base + offset);
+
+#ifdef VERBOSE_DEBUG
+	if (dd->flags & AES_FLAGS_DUMP_REG) {
+		char tmp[16];
+
+		dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
+			 atmel_aes_reg_name(offset, tmp, sizeof(tmp)));
+	}
+#endif /* VERBOSE_DEBUG */
+
+	return value;
+}
+
+static inline void atmel_aes_write(struct atmel_aes_dev *dd,
+					u32 offset, u32 value)
+{
+#ifdef VERBOSE_DEBUG
+	if (dd->flags & AES_FLAGS_DUMP_REG) {
+		char tmp[16];
+
+		dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
+			 atmel_aes_reg_name(offset, tmp, sizeof(tmp)));
+	}
+#endif /* VERBOSE_DEBUG */
+
+	writel_relaxed(value, dd->io_base + offset);
+}
+
+static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
+					u32 *value, int count)
+{
+	for (; count--; value++, offset += 4)
+		*value = atmel_aes_read(dd, offset);
+}
+
+static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
+			      const u32 *value, int count)
+{
+	for (; count--; value++, offset += 4)
+		atmel_aes_write(dd, offset, *value);
+}
+
+static inline void atmel_aes_read_block(struct atmel_aes_dev *dd, u32 offset,
+					void *value)
+{
+	atmel_aes_read_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
+}
+
+static inline void atmel_aes_write_block(struct atmel_aes_dev *dd, u32 offset,
+					 const void *value)
+{
+	atmel_aes_write_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
+}
+
+static inline int atmel_aes_wait_for_data_ready(struct atmel_aes_dev *dd,
+						atmel_aes_fn_t resume)
+{
+	u32 isr = atmel_aes_read(dd, AES_ISR);
+
+	if (unlikely(isr & AES_INT_DATARDY))
+		return resume(dd);
+
+	dd->resume = resume;
+	atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
+	return -EINPROGRESS;
+}
+
+static inline size_t atmel_aes_padlen(size_t len, size_t block_size)
+{
+	len &= block_size - 1;
+	return len ? block_size - len : 0;
+}
+
+static struct atmel_aes_dev *atmel_aes_dev_alloc(struct atmel_aes_base_ctx *ctx)
+{
+	struct atmel_aes_dev *aes_dd;
+
+	spin_lock_bh(&atmel_aes.lock);
+	/* One AES IP per SoC. */
+	aes_dd = list_first_entry_or_null(&atmel_aes.dev_list,
+					  struct atmel_aes_dev, list);
+	spin_unlock_bh(&atmel_aes.lock);
+	return aes_dd;
+}
+
+static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
+{
+	int err;
+
+	err = clk_enable(dd->iclk);
+	if (err)
+		return err;
+
+	atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
+	atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
+
+	return 0;
+}
+
+static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
+{
+	return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
+}
+
+static int atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
+{
+	int err;
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return err;
+
+	dd->hw_version = atmel_aes_get_version(dd);
+
+	dev_info(dd->dev, "version: 0x%x\n", dd->hw_version);
+
+	clk_disable(dd->iclk);
+	return 0;
+}
+
+static inline void atmel_aes_set_mode(struct atmel_aes_dev *dd,
+				      const struct atmel_aes_reqctx *rctx)
+{
+	/* Clear all but persistent flags and set request flags. */
+	dd->flags = (dd->flags & AES_FLAGS_PERSISTENT) | rctx->mode;
+}
+
+static inline bool atmel_aes_is_encrypt(const struct atmel_aes_dev *dd)
+{
+	return (dd->flags & AES_FLAGS_ENCRYPT);
+}
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err);
+#endif
+
+static void atmel_aes_set_iv_as_last_ciphertext_block(struct atmel_aes_dev *dd)
+{
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+
+	if (req->cryptlen < ivsize)
+		return;
+
+	if (rctx->mode & AES_FLAGS_ENCRYPT) {
+		scatterwalk_map_and_copy(req->iv, req->dst,
+					 req->cryptlen - ivsize, ivsize, 0);
+	} else {
+		if (req->src == req->dst)
+			memcpy(req->iv, rctx->lastc, ivsize);
+		else
+			scatterwalk_map_and_copy(req->iv, req->src,
+						 req->cryptlen - ivsize,
+						 ivsize, 0);
+	}
+}
+
+static inline struct atmel_aes_ctr_ctx *
+atmel_aes_ctr_ctx_cast(struct atmel_aes_base_ctx *ctx)
+{
+	return container_of(ctx, struct atmel_aes_ctr_ctx, base);
+}
+
+static void atmel_aes_ctr_update_req_iv(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+	int i;
+
+	/*
+	 * The CTR transfer works in fragments of data of maximum 1 MByte
+	 * because of the 16 bit CTR counter embedded in the IP. When reaching
+	 * here, ctx->blocks contains the number of blocks of the last fragment
+	 * processed, there is no need to explicit cast it to u16.
+	 */
+	for (i = 0; i < ctx->blocks; i++)
+		crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE);
+
+	memcpy(req->iv, ctx->iv, ivsize);
+}
+
+static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
+{
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+	if (dd->ctx->is_aead)
+		atmel_aes_authenc_complete(dd, err);
+#endif
+
+	clk_disable(dd->iclk);
+	dd->flags &= ~AES_FLAGS_BUSY;
+
+	if (!err && !dd->ctx->is_aead &&
+	    (rctx->mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_ECB) {
+		if ((rctx->mode & AES_FLAGS_OPMODE_MASK) != AES_FLAGS_CTR)
+			atmel_aes_set_iv_as_last_ciphertext_block(dd);
+		else
+			atmel_aes_ctr_update_req_iv(dd);
+	}
+
+	if (dd->is_async)
+		dd->areq->complete(dd->areq, err);
+
+	tasklet_schedule(&dd->queue_task);
+
+	return err;
+}
+
+static void atmel_aes_write_ctrl_key(struct atmel_aes_dev *dd, bool use_dma,
+				     const __be32 *iv, const u32 *key, int keylen)
+{
+	u32 valmr = 0;
+
+	/* MR register must be set before IV registers */
+	if (keylen == AES_KEYSIZE_128)
+		valmr |= AES_MR_KEYSIZE_128;
+	else if (keylen == AES_KEYSIZE_192)
+		valmr |= AES_MR_KEYSIZE_192;
+	else
+		valmr |= AES_MR_KEYSIZE_256;
+
+	valmr |= dd->flags & AES_FLAGS_MODE_MASK;
+
+	if (use_dma) {
+		valmr |= AES_MR_SMOD_IDATAR0;
+		if (dd->caps.has_dualbuff)
+			valmr |= AES_MR_DUALBUFF;
+	} else {
+		valmr |= AES_MR_SMOD_AUTO;
+	}
+
+	atmel_aes_write(dd, AES_MR, valmr);
+
+	atmel_aes_write_n(dd, AES_KEYWR(0), key, SIZE_IN_WORDS(keylen));
+
+	if (iv && (valmr & AES_MR_OPMOD_MASK) != AES_MR_OPMOD_ECB)
+		atmel_aes_write_block(dd, AES_IVR(0), iv);
+}
+
+static inline void atmel_aes_write_ctrl(struct atmel_aes_dev *dd, bool use_dma,
+					const __be32 *iv)
+
+{
+	atmel_aes_write_ctrl_key(dd, use_dma, iv,
+				 dd->ctx->key, dd->ctx->keylen);
+}
+
+/* CPU transfer */
+
+static int atmel_aes_cpu_transfer(struct atmel_aes_dev *dd)
+{
+	int err = 0;
+	u32 isr;
+
+	for (;;) {
+		atmel_aes_read_block(dd, AES_ODATAR(0), dd->data);
+		dd->data += 4;
+		dd->datalen -= AES_BLOCK_SIZE;
+
+		if (dd->datalen < AES_BLOCK_SIZE)
+			break;
+
+		atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
+
+		isr = atmel_aes_read(dd, AES_ISR);
+		if (!(isr & AES_INT_DATARDY)) {
+			dd->resume = atmel_aes_cpu_transfer;
+			atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
+			return -EINPROGRESS;
+		}
+	}
+
+	if (!sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
+				 dd->buf, dd->total))
+		err = -EINVAL;
+
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	return dd->cpu_transfer_complete(dd);
+}
+
+static int atmel_aes_cpu_start(struct atmel_aes_dev *dd,
+			       struct scatterlist *src,
+			       struct scatterlist *dst,
+			       size_t len,
+			       atmel_aes_fn_t resume)
+{
+	size_t padlen = atmel_aes_padlen(len, AES_BLOCK_SIZE);
+
+	if (unlikely(len == 0))
+		return -EINVAL;
+
+	sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
+
+	dd->total = len;
+	dd->real_dst = dst;
+	dd->cpu_transfer_complete = resume;
+	dd->datalen = len + padlen;
+	dd->data = (u32 *)dd->buf;
+	atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
+	return atmel_aes_wait_for_data_ready(dd, atmel_aes_cpu_transfer);
+}
+
+
+/* DMA transfer */
+
+static void atmel_aes_dma_callback(void *data);
+
+static bool atmel_aes_check_aligned(struct atmel_aes_dev *dd,
+				    struct scatterlist *sg,
+				    size_t len,
+				    struct atmel_aes_dma *dma)
+{
+	int nents;
+
+	if (!IS_ALIGNED(len, dd->ctx->block_size))
+		return false;
+
+	for (nents = 0; sg; sg = sg_next(sg), ++nents) {
+		if (!IS_ALIGNED(sg->offset, sizeof(u32)))
+			return false;
+
+		if (len <= sg->length) {
+			if (!IS_ALIGNED(len, dd->ctx->block_size))
+				return false;
+
+			dma->nents = nents+1;
+			dma->remainder = sg->length - len;
+			sg->length = len;
+			return true;
+		}
+
+		if (!IS_ALIGNED(sg->length, dd->ctx->block_size))
+			return false;
+
+		len -= sg->length;
+	}
+
+	return false;
+}
+
+static inline void atmel_aes_restore_sg(const struct atmel_aes_dma *dma)
+{
+	struct scatterlist *sg = dma->sg;
+	int nents = dma->nents;
+
+	if (!dma->remainder)
+		return;
+
+	while (--nents > 0 && sg)
+		sg = sg_next(sg);
+
+	if (!sg)
+		return;
+
+	sg->length += dma->remainder;
+}
+
+static int atmel_aes_map(struct atmel_aes_dev *dd,
+			 struct scatterlist *src,
+			 struct scatterlist *dst,
+			 size_t len)
+{
+	bool src_aligned, dst_aligned;
+	size_t padlen;
+
+	dd->total = len;
+	dd->src.sg = src;
+	dd->dst.sg = dst;
+	dd->real_dst = dst;
+
+	src_aligned = atmel_aes_check_aligned(dd, src, len, &dd->src);
+	if (src == dst)
+		dst_aligned = src_aligned;
+	else
+		dst_aligned = atmel_aes_check_aligned(dd, dst, len, &dd->dst);
+	if (!src_aligned || !dst_aligned) {
+		padlen = atmel_aes_padlen(len, dd->ctx->block_size);
+
+		if (dd->buflen < len + padlen)
+			return -ENOMEM;
+
+		if (!src_aligned) {
+			sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
+			dd->src.sg = &dd->aligned_sg;
+			dd->src.nents = 1;
+			dd->src.remainder = 0;
+		}
+
+		if (!dst_aligned) {
+			dd->dst.sg = &dd->aligned_sg;
+			dd->dst.nents = 1;
+			dd->dst.remainder = 0;
+		}
+
+		sg_init_table(&dd->aligned_sg, 1);
+		sg_set_buf(&dd->aligned_sg, dd->buf, len + padlen);
+	}
+
+	if (dd->src.sg == dd->dst.sg) {
+		dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
+					    DMA_BIDIRECTIONAL);
+		dd->dst.sg_len = dd->src.sg_len;
+		if (!dd->src.sg_len)
+			return -EFAULT;
+	} else {
+		dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
+					    DMA_TO_DEVICE);
+		if (!dd->src.sg_len)
+			return -EFAULT;
+
+		dd->dst.sg_len = dma_map_sg(dd->dev, dd->dst.sg, dd->dst.nents,
+					    DMA_FROM_DEVICE);
+		if (!dd->dst.sg_len) {
+			dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
+				     DMA_TO_DEVICE);
+			return -EFAULT;
+		}
+	}
+
+	return 0;
+}
+
+static void atmel_aes_unmap(struct atmel_aes_dev *dd)
+{
+	if (dd->src.sg == dd->dst.sg) {
+		dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
+			     DMA_BIDIRECTIONAL);
+
+		if (dd->src.sg != &dd->aligned_sg)
+			atmel_aes_restore_sg(&dd->src);
+	} else {
+		dma_unmap_sg(dd->dev, dd->dst.sg, dd->dst.nents,
+			     DMA_FROM_DEVICE);
+
+		if (dd->dst.sg != &dd->aligned_sg)
+			atmel_aes_restore_sg(&dd->dst);
+
+		dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
+			     DMA_TO_DEVICE);
+
+		if (dd->src.sg != &dd->aligned_sg)
+			atmel_aes_restore_sg(&dd->src);
+	}
+
+	if (dd->dst.sg == &dd->aligned_sg)
+		sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
+				    dd->buf, dd->total);
+}
+
+static int atmel_aes_dma_transfer_start(struct atmel_aes_dev *dd,
+					enum dma_slave_buswidth addr_width,
+					enum dma_transfer_direction dir,
+					u32 maxburst)
+{
+	struct dma_async_tx_descriptor *desc;
+	struct dma_slave_config config;
+	dma_async_tx_callback callback;
+	struct atmel_aes_dma *dma;
+	int err;
+
+	memset(&config, 0, sizeof(config));
+	config.src_addr_width = addr_width;
+	config.dst_addr_width = addr_width;
+	config.src_maxburst = maxburst;
+	config.dst_maxburst = maxburst;
+
+	switch (dir) {
+	case DMA_MEM_TO_DEV:
+		dma = &dd->src;
+		callback = NULL;
+		config.dst_addr = dd->phys_base + AES_IDATAR(0);
+		break;
+
+	case DMA_DEV_TO_MEM:
+		dma = &dd->dst;
+		callback = atmel_aes_dma_callback;
+		config.src_addr = dd->phys_base + AES_ODATAR(0);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	err = dmaengine_slave_config(dma->chan, &config);
+	if (err)
+		return err;
+
+	desc = dmaengine_prep_slave_sg(dma->chan, dma->sg, dma->sg_len, dir,
+				       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc)
+		return -ENOMEM;
+
+	desc->callback = callback;
+	desc->callback_param = dd;
+	dmaengine_submit(desc);
+	dma_async_issue_pending(dma->chan);
+
+	return 0;
+}
+
+static int atmel_aes_dma_start(struct atmel_aes_dev *dd,
+			       struct scatterlist *src,
+			       struct scatterlist *dst,
+			       size_t len,
+			       atmel_aes_fn_t resume)
+{
+	enum dma_slave_buswidth addr_width;
+	u32 maxburst;
+	int err;
+
+	switch (dd->ctx->block_size) {
+	case CFB8_BLOCK_SIZE:
+		addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+		maxburst = 1;
+		break;
+
+	case CFB16_BLOCK_SIZE:
+		addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+		maxburst = 1;
+		break;
+
+	case CFB32_BLOCK_SIZE:
+	case CFB64_BLOCK_SIZE:
+		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+		maxburst = 1;
+		break;
+
+	case AES_BLOCK_SIZE:
+		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+		maxburst = dd->caps.max_burst_size;
+		break;
+
+	default:
+		err = -EINVAL;
+		goto exit;
+	}
+
+	err = atmel_aes_map(dd, src, dst, len);
+	if (err)
+		goto exit;
+
+	dd->resume = resume;
+
+	/* Set output DMA transfer first */
+	err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_DEV_TO_MEM,
+					   maxburst);
+	if (err)
+		goto unmap;
+
+	/* Then set input DMA transfer */
+	err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_MEM_TO_DEV,
+					   maxburst);
+	if (err)
+		goto output_transfer_stop;
+
+	return -EINPROGRESS;
+
+output_transfer_stop:
+	dmaengine_terminate_sync(dd->dst.chan);
+unmap:
+	atmel_aes_unmap(dd);
+exit:
+	return atmel_aes_complete(dd, err);
+}
+
+static void atmel_aes_dma_callback(void *data)
+{
+	struct atmel_aes_dev *dd = data;
+
+	atmel_aes_unmap(dd);
+	dd->is_async = true;
+	(void)dd->resume(dd);
+}
+
+static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
+				  struct crypto_async_request *new_areq)
+{
+	struct crypto_async_request *areq, *backlog;
+	struct atmel_aes_base_ctx *ctx;
+	unsigned long flags;
+	bool start_async;
+	int err, ret = 0;
+
+	spin_lock_irqsave(&dd->lock, flags);
+	if (new_areq)
+		ret = crypto_enqueue_request(&dd->queue, new_areq);
+	if (dd->flags & AES_FLAGS_BUSY) {
+		spin_unlock_irqrestore(&dd->lock, flags);
+		return ret;
+	}
+	backlog = crypto_get_backlog(&dd->queue);
+	areq = crypto_dequeue_request(&dd->queue);
+	if (areq)
+		dd->flags |= AES_FLAGS_BUSY;
+	spin_unlock_irqrestore(&dd->lock, flags);
+
+	if (!areq)
+		return ret;
+
+	if (backlog)
+		backlog->complete(backlog, -EINPROGRESS);
+
+	ctx = crypto_tfm_ctx(areq->tfm);
+
+	dd->areq = areq;
+	dd->ctx = ctx;
+	start_async = (areq != new_areq);
+	dd->is_async = start_async;
+
+	/* WARNING: ctx->start() MAY change dd->is_async. */
+	err = ctx->start(dd);
+	return (start_async) ? ret : err;
+}
+
+
+/* AES async block ciphers */
+
+static int atmel_aes_transfer_complete(struct atmel_aes_dev *dd)
+{
+	return atmel_aes_complete(dd, 0);
+}
+
+static int atmel_aes_start(struct atmel_aes_dev *dd)
+{
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+	bool use_dma = (req->cryptlen >= ATMEL_AES_DMA_THRESHOLD ||
+			dd->ctx->block_size != AES_BLOCK_SIZE);
+	int err;
+
+	atmel_aes_set_mode(dd, rctx);
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	atmel_aes_write_ctrl(dd, use_dma, (void *)req->iv);
+	if (use_dma)
+		return atmel_aes_dma_start(dd, req->src, req->dst,
+					   req->cryptlen,
+					   atmel_aes_transfer_complete);
+
+	return atmel_aes_cpu_start(dd, req->src, req->dst, req->cryptlen,
+				   atmel_aes_transfer_complete);
+}
+
+static int atmel_aes_ctr_transfer(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct scatterlist *src, *dst;
+	size_t datalen;
+	u32 ctr;
+	u16 start, end;
+	bool use_dma, fragmented = false;
+
+	/* Check for transfer completion. */
+	ctx->offset += dd->total;
+	if (ctx->offset >= req->cryptlen)
+		return atmel_aes_transfer_complete(dd);
+
+	/* Compute data length. */
+	datalen = req->cryptlen - ctx->offset;
+	ctx->blocks = DIV_ROUND_UP(datalen, AES_BLOCK_SIZE);
+	ctr = be32_to_cpu(ctx->iv[3]);
+
+	/* Check 16bit counter overflow. */
+	start = ctr & 0xffff;
+	end = start + ctx->blocks - 1;
+
+	if (ctx->blocks >> 16 || end < start) {
+		ctr |= 0xffff;
+		datalen = AES_BLOCK_SIZE * (0x10000 - start);
+		fragmented = true;
+	}
+
+	use_dma = (datalen >= ATMEL_AES_DMA_THRESHOLD);
+
+	/* Jump to offset. */
+	src = scatterwalk_ffwd(ctx->src, req->src, ctx->offset);
+	dst = ((req->src == req->dst) ? src :
+	       scatterwalk_ffwd(ctx->dst, req->dst, ctx->offset));
+
+	/* Configure hardware. */
+	atmel_aes_write_ctrl(dd, use_dma, ctx->iv);
+	if (unlikely(fragmented)) {
+		/*
+		 * Increment the counter manually to cope with the hardware
+		 * counter overflow.
+		 */
+		ctx->iv[3] = cpu_to_be32(ctr);
+		crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE);
+	}
+
+	if (use_dma)
+		return atmel_aes_dma_start(dd, src, dst, datalen,
+					   atmel_aes_ctr_transfer);
+
+	return atmel_aes_cpu_start(dd, src, dst, datalen,
+				   atmel_aes_ctr_transfer);
+}
+
+static int atmel_aes_ctr_start(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+	int err;
+
+	atmel_aes_set_mode(dd, rctx);
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	memcpy(ctx->iv, req->iv, AES_BLOCK_SIZE);
+	ctx->offset = 0;
+	dd->total = 0;
+	return atmel_aes_ctr_transfer(dd);
+}
+
+static int atmel_aes_xts_fallback(struct skcipher_request *req, bool enc)
+{
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+	struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(
+			crypto_skcipher_reqtfm(req));
+
+	skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
+	skcipher_request_set_callback(&rctx->fallback_req, req->base.flags,
+				      req->base.complete, req->base.data);
+	skcipher_request_set_crypt(&rctx->fallback_req, req->src, req->dst,
+				   req->cryptlen, req->iv);
+
+	return enc ? crypto_skcipher_encrypt(&rctx->fallback_req) :
+		     crypto_skcipher_decrypt(&rctx->fallback_req);
+}
+
+static int atmel_aes_crypt(struct skcipher_request *req, unsigned long mode)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct atmel_aes_reqctx *rctx;
+	u32 opmode = mode & AES_FLAGS_OPMODE_MASK;
+
+	if (opmode == AES_FLAGS_XTS) {
+		if (req->cryptlen < XTS_BLOCK_SIZE)
+			return -EINVAL;
+
+		if (!IS_ALIGNED(req->cryptlen, XTS_BLOCK_SIZE))
+			return atmel_aes_xts_fallback(req,
+						      mode & AES_FLAGS_ENCRYPT);
+	}
+
+	/*
+	 * ECB, CBC, CFB, OFB or CTR mode require the plaintext and ciphertext
+	 * to have a positve integer length.
+	 */
+	if (!req->cryptlen && opmode != AES_FLAGS_XTS)
+		return 0;
+
+	if ((opmode == AES_FLAGS_ECB || opmode == AES_FLAGS_CBC) &&
+	    !IS_ALIGNED(req->cryptlen, crypto_skcipher_blocksize(skcipher)))
+		return -EINVAL;
+
+	switch (mode & AES_FLAGS_OPMODE_MASK) {
+	case AES_FLAGS_CFB8:
+		ctx->block_size = CFB8_BLOCK_SIZE;
+		break;
+
+	case AES_FLAGS_CFB16:
+		ctx->block_size = CFB16_BLOCK_SIZE;
+		break;
+
+	case AES_FLAGS_CFB32:
+		ctx->block_size = CFB32_BLOCK_SIZE;
+		break;
+
+	case AES_FLAGS_CFB64:
+		ctx->block_size = CFB64_BLOCK_SIZE;
+		break;
+
+	default:
+		ctx->block_size = AES_BLOCK_SIZE;
+		break;
+	}
+	ctx->is_aead = false;
+
+	rctx = skcipher_request_ctx(req);
+	rctx->mode = mode;
+
+	if (opmode != AES_FLAGS_ECB &&
+	    !(mode & AES_FLAGS_ENCRYPT) && req->src == req->dst) {
+		unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+
+		if (req->cryptlen >= ivsize)
+			scatterwalk_map_and_copy(rctx->lastc, req->src,
+						 req->cryptlen - ivsize,
+						 ivsize, 0);
+	}
+
+	return atmel_aes_handle_queue(ctx->dd, &req->base);
+}
+
+static int atmel_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+			   unsigned int keylen)
+{
+	struct atmel_aes_base_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	if (keylen != AES_KEYSIZE_128 &&
+	    keylen != AES_KEYSIZE_192 &&
+	    keylen != AES_KEYSIZE_256)
+		return -EINVAL;
+
+	memcpy(ctx->key, key, keylen);
+	ctx->keylen = keylen;
+
+	return 0;
+}
+
+static int atmel_aes_ecb_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_ECB | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_ecb_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_ECB);
+}
+
+static int atmel_aes_cbc_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cbc_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CBC);
+}
+
+static int atmel_aes_ofb_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_OFB | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_ofb_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_OFB);
+}
+
+static int atmel_aes_cfb_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB128 | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cfb_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB128);
+}
+
+static int atmel_aes_cfb64_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB64 | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cfb64_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB64);
+}
+
+static int atmel_aes_cfb32_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB32 | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cfb32_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB32);
+}
+
+static int atmel_aes_cfb16_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB16 | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cfb16_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB16);
+}
+
+static int atmel_aes_cfb8_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB8 | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_cfb8_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CFB8);
+}
+
+static int atmel_aes_ctr_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CTR | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_ctr_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_CTR);
+}
+
+static int atmel_aes_init_tfm(struct crypto_skcipher *tfm)
+{
+	struct atmel_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct atmel_aes_dev *dd;
+
+	dd = atmel_aes_dev_alloc(&ctx->base);
+	if (!dd)
+		return -ENODEV;
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx));
+	ctx->base.dd = dd;
+	ctx->base.start = atmel_aes_start;
+
+	return 0;
+}
+
+static int atmel_aes_ctr_init_tfm(struct crypto_skcipher *tfm)
+{
+	struct atmel_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct atmel_aes_dev *dd;
+
+	dd = atmel_aes_dev_alloc(&ctx->base);
+	if (!dd)
+		return -ENODEV;
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx));
+	ctx->base.dd = dd;
+	ctx->base.start = atmel_aes_ctr_start;
+
+	return 0;
+}
+
+static struct skcipher_alg aes_algs[] = {
+{
+	.base.cra_name		= "ecb(aes)",
+	.base.cra_driver_name	= "atmel-ecb-aes",
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_ecb_encrypt,
+	.decrypt		= atmel_aes_ecb_decrypt,
+},
+{
+	.base.cra_name		= "cbc(aes)",
+	.base.cra_driver_name	= "atmel-cbc-aes",
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cbc_encrypt,
+	.decrypt		= atmel_aes_cbc_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "ofb(aes)",
+	.base.cra_driver_name	= "atmel-ofb-aes",
+	.base.cra_blocksize	= 1,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_ofb_encrypt,
+	.decrypt		= atmel_aes_ofb_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "cfb(aes)",
+	.base.cra_driver_name	= "atmel-cfb-aes",
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cfb_encrypt,
+	.decrypt		= atmel_aes_cfb_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "cfb32(aes)",
+	.base.cra_driver_name	= "atmel-cfb32-aes",
+	.base.cra_blocksize	= CFB32_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cfb32_encrypt,
+	.decrypt		= atmel_aes_cfb32_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "cfb16(aes)",
+	.base.cra_driver_name	= "atmel-cfb16-aes",
+	.base.cra_blocksize	= CFB16_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cfb16_encrypt,
+	.decrypt		= atmel_aes_cfb16_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "cfb8(aes)",
+	.base.cra_driver_name	= "atmel-cfb8-aes",
+	.base.cra_blocksize	= CFB8_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cfb8_encrypt,
+	.decrypt		= atmel_aes_cfb8_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "ctr(aes)",
+	.base.cra_driver_name	= "atmel-ctr-aes",
+	.base.cra_blocksize	= 1,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctr_ctx),
+
+	.init			= atmel_aes_ctr_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_ctr_encrypt,
+	.decrypt		= atmel_aes_ctr_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+},
+};
+
+static struct skcipher_alg aes_cfb64_alg = {
+	.base.cra_name		= "cfb64(aes)",
+	.base.cra_driver_name	= "atmel-cfb64-aes",
+	.base.cra_blocksize	= CFB64_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_ctx),
+
+	.init			= atmel_aes_init_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= atmel_aes_setkey,
+	.encrypt		= atmel_aes_cfb64_encrypt,
+	.decrypt		= atmel_aes_cfb64_decrypt,
+	.ivsize			= AES_BLOCK_SIZE,
+};
+
+
+/* gcm aead functions */
+
+static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
+			       const u32 *data, size_t datalen,
+			       const __be32 *ghash_in, __be32 *ghash_out,
+			       atmel_aes_fn_t resume);
+static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd);
+
+static int atmel_aes_gcm_start(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_process(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_length(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_data(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd);
+static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd);
+
+static inline struct atmel_aes_gcm_ctx *
+atmel_aes_gcm_ctx_cast(struct atmel_aes_base_ctx *ctx)
+{
+	return container_of(ctx, struct atmel_aes_gcm_ctx, base);
+}
+
+static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
+			       const u32 *data, size_t datalen,
+			       const __be32 *ghash_in, __be32 *ghash_out,
+			       atmel_aes_fn_t resume)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+
+	dd->data = (u32 *)data;
+	dd->datalen = datalen;
+	ctx->ghash_in = ghash_in;
+	ctx->ghash_out = ghash_out;
+	ctx->ghash_resume = resume;
+
+	atmel_aes_write_ctrl(dd, false, NULL);
+	return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_ghash_init);
+}
+
+static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+
+	/* Set the data length. */
+	atmel_aes_write(dd, AES_AADLENR, dd->total);
+	atmel_aes_write(dd, AES_CLENR, 0);
+
+	/* If needed, overwrite the GCM Intermediate Hash Word Registers */
+	if (ctx->ghash_in)
+		atmel_aes_write_block(dd, AES_GHASHR(0), ctx->ghash_in);
+
+	return atmel_aes_gcm_ghash_finalize(dd);
+}
+
+static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	u32 isr;
+
+	/* Write data into the Input Data Registers. */
+	while (dd->datalen > 0) {
+		atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
+		dd->data += 4;
+		dd->datalen -= AES_BLOCK_SIZE;
+
+		isr = atmel_aes_read(dd, AES_ISR);
+		if (!(isr & AES_INT_DATARDY)) {
+			dd->resume = atmel_aes_gcm_ghash_finalize;
+			atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
+			return -EINPROGRESS;
+		}
+	}
+
+	/* Read the computed hash from GHASHRx. */
+	atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash_out);
+
+	return ctx->ghash_resume(dd);
+}
+
+
+static int atmel_aes_gcm_start(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct atmel_aes_reqctx *rctx = aead_request_ctx(req);
+	size_t ivsize = crypto_aead_ivsize(tfm);
+	size_t datalen, padlen;
+	const void *iv = req->iv;
+	u8 *data = dd->buf;
+	int err;
+
+	atmel_aes_set_mode(dd, rctx);
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	if (likely(ivsize == GCM_AES_IV_SIZE)) {
+		memcpy(ctx->j0, iv, ivsize);
+		ctx->j0[3] = cpu_to_be32(1);
+		return atmel_aes_gcm_process(dd);
+	}
+
+	padlen = atmel_aes_padlen(ivsize, AES_BLOCK_SIZE);
+	datalen = ivsize + padlen + AES_BLOCK_SIZE;
+	if (datalen > dd->buflen)
+		return atmel_aes_complete(dd, -EINVAL);
+
+	memcpy(data, iv, ivsize);
+	memset(data + ivsize, 0, padlen + sizeof(u64));
+	((__be64 *)(data + datalen))[-1] = cpu_to_be64(ivsize * 8);
+
+	return atmel_aes_gcm_ghash(dd, (const u32 *)data, datalen,
+				   NULL, ctx->j0, atmel_aes_gcm_process);
+}
+
+static int atmel_aes_gcm_process(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	bool enc = atmel_aes_is_encrypt(dd);
+	u32 authsize;
+
+	/* Compute text length. */
+	authsize = crypto_aead_authsize(tfm);
+	ctx->textlen = req->cryptlen - (enc ? 0 : authsize);
+
+	/*
+	 * According to tcrypt test suite, the GCM Automatic Tag Generation
+	 * fails when both the message and its associated data are empty.
+	 */
+	if (likely(req->assoclen != 0 || ctx->textlen != 0))
+		dd->flags |= AES_FLAGS_GTAGEN;
+
+	atmel_aes_write_ctrl(dd, false, NULL);
+	return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_length);
+}
+
+static int atmel_aes_gcm_length(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	__be32 j0_lsw, *j0 = ctx->j0;
+	size_t padlen;
+
+	/* Write incr32(J0) into IV. */
+	j0_lsw = j0[3];
+	be32_add_cpu(&j0[3], 1);
+	atmel_aes_write_block(dd, AES_IVR(0), j0);
+	j0[3] = j0_lsw;
+
+	/* Set aad and text lengths. */
+	atmel_aes_write(dd, AES_AADLENR, req->assoclen);
+	atmel_aes_write(dd, AES_CLENR, ctx->textlen);
+
+	/* Check whether AAD are present. */
+	if (unlikely(req->assoclen == 0)) {
+		dd->datalen = 0;
+		return atmel_aes_gcm_data(dd);
+	}
+
+	/* Copy assoc data and add padding. */
+	padlen = atmel_aes_padlen(req->assoclen, AES_BLOCK_SIZE);
+	if (unlikely(req->assoclen + padlen > dd->buflen))
+		return atmel_aes_complete(dd, -EINVAL);
+	sg_copy_to_buffer(req->src, sg_nents(req->src), dd->buf, req->assoclen);
+
+	/* Write assoc data into the Input Data register. */
+	dd->data = (u32 *)dd->buf;
+	dd->datalen = req->assoclen + padlen;
+	return atmel_aes_gcm_data(dd);
+}
+
+static int atmel_aes_gcm_data(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	bool use_dma = (ctx->textlen >= ATMEL_AES_DMA_THRESHOLD);
+	struct scatterlist *src, *dst;
+	u32 isr, mr;
+
+	/* Write AAD first. */
+	while (dd->datalen > 0) {
+		atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
+		dd->data += 4;
+		dd->datalen -= AES_BLOCK_SIZE;
+
+		isr = atmel_aes_read(dd, AES_ISR);
+		if (!(isr & AES_INT_DATARDY)) {
+			dd->resume = atmel_aes_gcm_data;
+			atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
+			return -EINPROGRESS;
+		}
+	}
+
+	/* GMAC only. */
+	if (unlikely(ctx->textlen == 0))
+		return atmel_aes_gcm_tag_init(dd);
+
+	/* Prepare src and dst scatter lists to transfer cipher/plain texts */
+	src = scatterwalk_ffwd(ctx->src, req->src, req->assoclen);
+	dst = ((req->src == req->dst) ? src :
+	       scatterwalk_ffwd(ctx->dst, req->dst, req->assoclen));
+
+	if (use_dma) {
+		/* Update the Mode Register for DMA transfers. */
+		mr = atmel_aes_read(dd, AES_MR);
+		mr &= ~(AES_MR_SMOD_MASK | AES_MR_DUALBUFF);
+		mr |= AES_MR_SMOD_IDATAR0;
+		if (dd->caps.has_dualbuff)
+			mr |= AES_MR_DUALBUFF;
+		atmel_aes_write(dd, AES_MR, mr);
+
+		return atmel_aes_dma_start(dd, src, dst, ctx->textlen,
+					   atmel_aes_gcm_tag_init);
+	}
+
+	return atmel_aes_cpu_start(dd, src, dst, ctx->textlen,
+				   atmel_aes_gcm_tag_init);
+}
+
+static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	__be64 *data = dd->buf;
+
+	if (likely(dd->flags & AES_FLAGS_GTAGEN)) {
+		if (!(atmel_aes_read(dd, AES_ISR) & AES_INT_TAGRDY)) {
+			dd->resume = atmel_aes_gcm_tag_init;
+			atmel_aes_write(dd, AES_IER, AES_INT_TAGRDY);
+			return -EINPROGRESS;
+		}
+
+		return atmel_aes_gcm_finalize(dd);
+	}
+
+	/* Read the GCM Intermediate Hash Word Registers. */
+	atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash);
+
+	data[0] = cpu_to_be64(req->assoclen * 8);
+	data[1] = cpu_to_be64(ctx->textlen * 8);
+
+	return atmel_aes_gcm_ghash(dd, (const u32 *)data, AES_BLOCK_SIZE,
+				   ctx->ghash, ctx->ghash, atmel_aes_gcm_tag);
+}
+
+static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	unsigned long flags;
+
+	/*
+	 * Change mode to CTR to complete the tag generation.
+	 * Use J0 as Initialization Vector.
+	 */
+	flags = dd->flags;
+	dd->flags &= ~(AES_FLAGS_OPMODE_MASK | AES_FLAGS_GTAGEN);
+	dd->flags |= AES_FLAGS_CTR;
+	atmel_aes_write_ctrl(dd, false, ctx->j0);
+	dd->flags = flags;
+
+	atmel_aes_write_block(dd, AES_IDATAR(0), ctx->ghash);
+	return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_finalize);
+}
+
+static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	bool enc = atmel_aes_is_encrypt(dd);
+	u32 offset, authsize, itag[4], *otag = ctx->tag;
+	int err;
+
+	/* Read the computed tag. */
+	if (likely(dd->flags & AES_FLAGS_GTAGEN))
+		atmel_aes_read_block(dd, AES_TAGR(0), ctx->tag);
+	else
+		atmel_aes_read_block(dd, AES_ODATAR(0), ctx->tag);
+
+	offset = req->assoclen + ctx->textlen;
+	authsize = crypto_aead_authsize(tfm);
+	if (enc) {
+		scatterwalk_map_and_copy(otag, req->dst, offset, authsize, 1);
+		err = 0;
+	} else {
+		scatterwalk_map_and_copy(itag, req->src, offset, authsize, 0);
+		err = crypto_memneq(itag, otag, authsize) ? -EBADMSG : 0;
+	}
+
+	return atmel_aes_complete(dd, err);
+}
+
+static int atmel_aes_gcm_crypt(struct aead_request *req,
+			       unsigned long mode)
+{
+	struct atmel_aes_base_ctx *ctx;
+	struct atmel_aes_reqctx *rctx;
+
+	ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
+	ctx->block_size = AES_BLOCK_SIZE;
+	ctx->is_aead = true;
+
+	rctx = aead_request_ctx(req);
+	rctx->mode = AES_FLAGS_GCM | mode;
+
+	return atmel_aes_handle_queue(ctx->dd, &req->base);
+}
+
+static int atmel_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
+				unsigned int keylen)
+{
+	struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm);
+
+	if (keylen != AES_KEYSIZE_256 &&
+	    keylen != AES_KEYSIZE_192 &&
+	    keylen != AES_KEYSIZE_128)
+		return -EINVAL;
+
+	memcpy(ctx->key, key, keylen);
+	ctx->keylen = keylen;
+
+	return 0;
+}
+
+static int atmel_aes_gcm_setauthsize(struct crypto_aead *tfm,
+				     unsigned int authsize)
+{
+	return crypto_gcm_check_authsize(authsize);
+}
+
+static int atmel_aes_gcm_encrypt(struct aead_request *req)
+{
+	return atmel_aes_gcm_crypt(req, AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_gcm_decrypt(struct aead_request *req)
+{
+	return atmel_aes_gcm_crypt(req, 0);
+}
+
+static int atmel_aes_gcm_init(struct crypto_aead *tfm)
+{
+	struct atmel_aes_gcm_ctx *ctx = crypto_aead_ctx(tfm);
+	struct atmel_aes_dev *dd;
+
+	dd = atmel_aes_dev_alloc(&ctx->base);
+	if (!dd)
+		return -ENODEV;
+
+	crypto_aead_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx));
+	ctx->base.dd = dd;
+	ctx->base.start = atmel_aes_gcm_start;
+
+	return 0;
+}
+
+static struct aead_alg aes_gcm_alg = {
+	.setkey		= atmel_aes_gcm_setkey,
+	.setauthsize	= atmel_aes_gcm_setauthsize,
+	.encrypt	= atmel_aes_gcm_encrypt,
+	.decrypt	= atmel_aes_gcm_decrypt,
+	.init		= atmel_aes_gcm_init,
+	.ivsize		= GCM_AES_IV_SIZE,
+	.maxauthsize	= AES_BLOCK_SIZE,
+
+	.base = {
+		.cra_name		= "gcm(aes)",
+		.cra_driver_name	= "atmel-gcm-aes",
+		.cra_blocksize		= 1,
+		.cra_ctxsize		= sizeof(struct atmel_aes_gcm_ctx),
+	},
+};
+
+
+/* xts functions */
+
+static inline struct atmel_aes_xts_ctx *
+atmel_aes_xts_ctx_cast(struct atmel_aes_base_ctx *ctx)
+{
+	return container_of(ctx, struct atmel_aes_xts_ctx, base);
+}
+
+static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd);
+
+static int atmel_aes_xts_start(struct atmel_aes_dev *dd)
+{
+	struct atmel_aes_xts_ctx *ctx = atmel_aes_xts_ctx_cast(dd->ctx);
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	struct atmel_aes_reqctx *rctx = skcipher_request_ctx(req);
+	unsigned long flags;
+	int err;
+
+	atmel_aes_set_mode(dd, rctx);
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	/* Compute the tweak value from req->iv with ecb(aes). */
+	flags = dd->flags;
+	dd->flags &= ~AES_FLAGS_MODE_MASK;
+	dd->flags |= (AES_FLAGS_ECB | AES_FLAGS_ENCRYPT);
+	atmel_aes_write_ctrl_key(dd, false, NULL,
+				 ctx->key2, ctx->base.keylen);
+	dd->flags = flags;
+
+	atmel_aes_write_block(dd, AES_IDATAR(0), req->iv);
+	return atmel_aes_wait_for_data_ready(dd, atmel_aes_xts_process_data);
+}
+
+static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd)
+{
+	struct skcipher_request *req = skcipher_request_cast(dd->areq);
+	bool use_dma = (req->cryptlen >= ATMEL_AES_DMA_THRESHOLD);
+	u32 tweak[AES_BLOCK_SIZE / sizeof(u32)];
+	static const __le32 one[AES_BLOCK_SIZE / sizeof(u32)] = {cpu_to_le32(1), };
+	u8 *tweak_bytes = (u8 *)tweak;
+	int i;
+
+	/* Read the computed ciphered tweak value. */
+	atmel_aes_read_block(dd, AES_ODATAR(0), tweak);
+	/*
+	 * Hardware quirk:
+	 * the order of the ciphered tweak bytes need to be reversed before
+	 * writing them into the ODATARx registers.
+	 */
+	for (i = 0; i < AES_BLOCK_SIZE/2; ++i)
+		swap(tweak_bytes[i], tweak_bytes[AES_BLOCK_SIZE - 1 - i]);
+
+	/* Process the data. */
+	atmel_aes_write_ctrl(dd, use_dma, NULL);
+	atmel_aes_write_block(dd, AES_TWR(0), tweak);
+	atmel_aes_write_block(dd, AES_ALPHAR(0), one);
+	if (use_dma)
+		return atmel_aes_dma_start(dd, req->src, req->dst,
+					   req->cryptlen,
+					   atmel_aes_transfer_complete);
+
+	return atmel_aes_cpu_start(dd, req->src, req->dst, req->cryptlen,
+				   atmel_aes_transfer_complete);
+}
+
+static int atmel_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key,
+				unsigned int keylen)
+{
+	struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+	int err;
+
+	err = xts_check_key(crypto_skcipher_tfm(tfm), key, keylen);
+	if (err)
+		return err;
+
+	crypto_skcipher_clear_flags(ctx->fallback_tfm, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(ctx->fallback_tfm, tfm->base.crt_flags &
+				  CRYPTO_TFM_REQ_MASK);
+	err = crypto_skcipher_setkey(ctx->fallback_tfm, key, keylen);
+	if (err)
+		return err;
+
+	memcpy(ctx->base.key, key, keylen/2);
+	memcpy(ctx->key2, key + keylen/2, keylen/2);
+	ctx->base.keylen = keylen/2;
+
+	return 0;
+}
+
+static int atmel_aes_xts_encrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_XTS | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_xts_decrypt(struct skcipher_request *req)
+{
+	return atmel_aes_crypt(req, AES_FLAGS_XTS);
+}
+
+static int atmel_aes_xts_init_tfm(struct crypto_skcipher *tfm)
+{
+	struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct atmel_aes_dev *dd;
+	const char *tfm_name = crypto_tfm_alg_name(&tfm->base);
+
+	dd = atmel_aes_dev_alloc(&ctx->base);
+	if (!dd)
+		return -ENODEV;
+
+	ctx->fallback_tfm = crypto_alloc_skcipher(tfm_name, 0,
+						  CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(ctx->fallback_tfm))
+		return PTR_ERR(ctx->fallback_tfm);
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx) +
+				    crypto_skcipher_reqsize(ctx->fallback_tfm));
+	ctx->base.dd = dd;
+	ctx->base.start = atmel_aes_xts_start;
+
+	return 0;
+}
+
+static void atmel_aes_xts_exit_tfm(struct crypto_skcipher *tfm)
+{
+	struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	crypto_free_skcipher(ctx->fallback_tfm);
+}
+
+static struct skcipher_alg aes_xts_alg = {
+	.base.cra_name		= "xts(aes)",
+	.base.cra_driver_name	= "atmel-xts-aes",
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct atmel_aes_xts_ctx),
+	.base.cra_flags		= CRYPTO_ALG_NEED_FALLBACK,
+
+	.min_keysize		= 2 * AES_MIN_KEY_SIZE,
+	.max_keysize		= 2 * AES_MAX_KEY_SIZE,
+	.ivsize			= AES_BLOCK_SIZE,
+	.setkey			= atmel_aes_xts_setkey,
+	.encrypt		= atmel_aes_xts_encrypt,
+	.decrypt		= atmel_aes_xts_decrypt,
+	.init			= atmel_aes_xts_init_tfm,
+	.exit			= atmel_aes_xts_exit_tfm,
+};
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+/* authenc aead functions */
+
+static int atmel_aes_authenc_start(struct atmel_aes_dev *dd);
+static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err,
+				  bool is_async);
+static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err,
+				      bool is_async);
+static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd);
+static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err,
+				   bool is_async);
+
+static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+
+	if (err && (dd->flags & AES_FLAGS_OWN_SHA))
+		atmel_sha_authenc_abort(&rctx->auth_req);
+	dd->flags &= ~AES_FLAGS_OWN_SHA;
+}
+
+static int atmel_aes_authenc_start(struct atmel_aes_dev *dd)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);
+	int err;
+
+	atmel_aes_set_mode(dd, &rctx->base);
+
+	err = atmel_aes_hw_init(dd);
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	return atmel_sha_authenc_schedule(&rctx->auth_req, ctx->auth,
+					  atmel_aes_authenc_init, dd);
+}
+
+static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err,
+				  bool is_async)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+
+	if (is_async)
+		dd->is_async = true;
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	/* If here, we've got the ownership of the SHA device. */
+	dd->flags |= AES_FLAGS_OWN_SHA;
+
+	/* Configure the SHA device. */
+	return atmel_sha_authenc_init(&rctx->auth_req,
+				      req->src, req->assoclen,
+				      rctx->textlen,
+				      atmel_aes_authenc_transfer, dd);
+}
+
+static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err,
+				      bool is_async)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+	bool enc = atmel_aes_is_encrypt(dd);
+	struct scatterlist *src, *dst;
+	__be32 iv[AES_BLOCK_SIZE / sizeof(u32)];
+	u32 emr;
+
+	if (is_async)
+		dd->is_async = true;
+	if (err)
+		return atmel_aes_complete(dd, err);
+
+	/* Prepare src and dst scatter-lists to transfer cipher/plain texts. */
+	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
+	dst = src;
+
+	if (req->src != req->dst)
+		dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
+
+	/* Configure the AES device. */
+	memcpy(iv, req->iv, sizeof(iv));
+
+	/*
+	 * Here we always set the 2nd parameter of atmel_aes_write_ctrl() to
+	 * 'true' even if the data transfer is actually performed by the CPU (so
+	 * not by the DMA) because we must force the AES_MR_SMOD bitfield to the
+	 * value AES_MR_SMOD_IDATAR0. Indeed, both AES_MR_SMOD and SHA_MR_SMOD
+	 * must be set to *_MR_SMOD_IDATAR0.
+	 */
+	atmel_aes_write_ctrl(dd, true, iv);
+	emr = AES_EMR_PLIPEN;
+	if (!enc)
+		emr |= AES_EMR_PLIPD;
+	atmel_aes_write(dd, AES_EMR, emr);
+
+	/* Transfer data. */
+	return atmel_aes_dma_start(dd, src, dst, rctx->textlen,
+				   atmel_aes_authenc_digest);
+}
+
+static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+
+	/* atmel_sha_authenc_final() releases the SHA device. */
+	dd->flags &= ~AES_FLAGS_OWN_SHA;
+	return atmel_sha_authenc_final(&rctx->auth_req,
+				       rctx->digest, sizeof(rctx->digest),
+				       atmel_aes_authenc_final, dd);
+}
+
+static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err,
+				   bool is_async)
+{
+	struct aead_request *req = aead_request_cast(dd->areq);
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	bool enc = atmel_aes_is_encrypt(dd);
+	u32 idigest[SHA512_DIGEST_SIZE / sizeof(u32)], *odigest = rctx->digest;
+	u32 offs, authsize;
+
+	if (is_async)
+		dd->is_async = true;
+	if (err)
+		goto complete;
+
+	offs = req->assoclen + rctx->textlen;
+	authsize = crypto_aead_authsize(tfm);
+	if (enc) {
+		scatterwalk_map_and_copy(odigest, req->dst, offs, authsize, 1);
+	} else {
+		scatterwalk_map_and_copy(idigest, req->src, offs, authsize, 0);
+		if (crypto_memneq(idigest, odigest, authsize))
+			err = -EBADMSG;
+	}
+
+complete:
+	return atmel_aes_complete(dd, err);
+}
+
+static int atmel_aes_authenc_setkey(struct crypto_aead *tfm, const u8 *key,
+				    unsigned int keylen)
+{
+	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);
+	struct crypto_authenc_keys keys;
+	int err;
+
+	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
+		goto badkey;
+
+	if (keys.enckeylen > sizeof(ctx->base.key))
+		goto badkey;
+
+	/* Save auth key. */
+	err = atmel_sha_authenc_setkey(ctx->auth,
+				       keys.authkey, keys.authkeylen,
+				       crypto_aead_get_flags(tfm));
+	if (err) {
+		memzero_explicit(&keys, sizeof(keys));
+		return err;
+	}
+
+	/* Save enc key. */
+	ctx->base.keylen = keys.enckeylen;
+	memcpy(ctx->base.key, keys.enckey, keys.enckeylen);
+
+	memzero_explicit(&keys, sizeof(keys));
+	return 0;
+
+badkey:
+	memzero_explicit(&keys, sizeof(keys));
+	return -EINVAL;
+}
+
+static int atmel_aes_authenc_init_tfm(struct crypto_aead *tfm,
+				      unsigned long auth_mode)
+{
+	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);
+	unsigned int auth_reqsize = atmel_sha_authenc_get_reqsize();
+	struct atmel_aes_dev *dd;
+
+	dd = atmel_aes_dev_alloc(&ctx->base);
+	if (!dd)
+		return -ENODEV;
+
+	ctx->auth = atmel_sha_authenc_spawn(auth_mode);
+	if (IS_ERR(ctx->auth))
+		return PTR_ERR(ctx->auth);
+
+	crypto_aead_set_reqsize(tfm, (sizeof(struct atmel_aes_authenc_reqctx) +
+				      auth_reqsize));
+	ctx->base.dd = dd;
+	ctx->base.start = atmel_aes_authenc_start;
+
+	return 0;
+}
+
+static int atmel_aes_authenc_hmac_sha1_init_tfm(struct crypto_aead *tfm)
+{
+	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA1);
+}
+
+static int atmel_aes_authenc_hmac_sha224_init_tfm(struct crypto_aead *tfm)
+{
+	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA224);
+}
+
+static int atmel_aes_authenc_hmac_sha256_init_tfm(struct crypto_aead *tfm)
+{
+	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA256);
+}
+
+static int atmel_aes_authenc_hmac_sha384_init_tfm(struct crypto_aead *tfm)
+{
+	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA384);
+}
+
+static int atmel_aes_authenc_hmac_sha512_init_tfm(struct crypto_aead *tfm)
+{
+	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA512);
+}
+
+static void atmel_aes_authenc_exit_tfm(struct crypto_aead *tfm)
+{
+	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);
+
+	atmel_sha_authenc_free(ctx->auth);
+}
+
+static int atmel_aes_authenc_crypt(struct aead_request *req,
+				   unsigned long mode)
+{
+	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);
+	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+	struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm);
+	u32 authsize = crypto_aead_authsize(tfm);
+	bool enc = (mode & AES_FLAGS_ENCRYPT);
+
+	/* Compute text length. */
+	if (!enc && req->cryptlen < authsize)
+		return -EINVAL;
+	rctx->textlen = req->cryptlen - (enc ? 0 : authsize);
+
+	/*
+	 * Currently, empty messages are not supported yet:
+	 * the SHA auto-padding can be used only on non-empty messages.
+	 * Hence a special case needs to be implemented for empty message.
+	 */
+	if (!rctx->textlen && !req->assoclen)
+		return -EINVAL;
+
+	rctx->base.mode = mode;
+	ctx->block_size = AES_BLOCK_SIZE;
+	ctx->is_aead = true;
+
+	return atmel_aes_handle_queue(ctx->dd, &req->base);
+}
+
+static int atmel_aes_authenc_cbc_aes_encrypt(struct aead_request *req)
+{
+	return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT);
+}
+
+static int atmel_aes_authenc_cbc_aes_decrypt(struct aead_request *req)
+{
+	return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC);
+}
+
+static struct aead_alg aes_authenc_algs[] = {
+{
+	.setkey		= atmel_aes_authenc_setkey,
+	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,
+	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,
+	.init		= atmel_aes_authenc_hmac_sha1_init_tfm,
+	.exit		= atmel_aes_authenc_exit_tfm,
+	.ivsize		= AES_BLOCK_SIZE,
+	.maxauthsize	= SHA1_DIGEST_SIZE,
+
+	.base = {
+		.cra_name		= "authenc(hmac(sha1),cbc(aes))",
+		.cra_driver_name	= "atmel-authenc-hmac-sha1-cbc-aes",
+		.cra_blocksize		= AES_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),
+	},
+},
+{
+	.setkey		= atmel_aes_authenc_setkey,
+	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,
+	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,
+	.init		= atmel_aes_authenc_hmac_sha224_init_tfm,
+	.exit		= atmel_aes_authenc_exit_tfm,
+	.ivsize		= AES_BLOCK_SIZE,
+	.maxauthsize	= SHA224_DIGEST_SIZE,
+
+	.base = {
+		.cra_name		= "authenc(hmac(sha224),cbc(aes))",
+		.cra_driver_name	= "atmel-authenc-hmac-sha224-cbc-aes",
+		.cra_blocksize		= AES_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),
+	},
+},
+{
+	.setkey		= atmel_aes_authenc_setkey,
+	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,
+	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,
+	.init		= atmel_aes_authenc_hmac_sha256_init_tfm,
+	.exit		= atmel_aes_authenc_exit_tfm,
+	.ivsize		= AES_BLOCK_SIZE,
+	.maxauthsize	= SHA256_DIGEST_SIZE,
+
+	.base = {
+		.cra_name		= "authenc(hmac(sha256),cbc(aes))",
+		.cra_driver_name	= "atmel-authenc-hmac-sha256-cbc-aes",
+		.cra_blocksize		= AES_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),
+	},
+},
+{
+	.setkey		= atmel_aes_authenc_setkey,
+	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,
+	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,
+	.init		= atmel_aes_authenc_hmac_sha384_init_tfm,
+	.exit		= atmel_aes_authenc_exit_tfm,
+	.ivsize		= AES_BLOCK_SIZE,
+	.maxauthsize	= SHA384_DIGEST_SIZE,
+
+	.base = {
+		.cra_name		= "authenc(hmac(sha384),cbc(aes))",
+		.cra_driver_name	= "atmel-authenc-hmac-sha384-cbc-aes",
+		.cra_blocksize		= AES_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),
+	},
+},
+{
+	.setkey		= atmel_aes_authenc_setkey,
+	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,
+	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,
+	.init		= atmel_aes_authenc_hmac_sha512_init_tfm,
+	.exit		= atmel_aes_authenc_exit_tfm,
+	.ivsize		= AES_BLOCK_SIZE,
+	.maxauthsize	= SHA512_DIGEST_SIZE,
+
+	.base = {
+		.cra_name		= "authenc(hmac(sha512),cbc(aes))",
+		.cra_driver_name	= "atmel-authenc-hmac-sha512-cbc-aes",
+		.cra_blocksize		= AES_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),
+	},
+},
+};
+#endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */
+
+/* Probe functions */
+
+static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
+{
+	dd->buf = (void *)__get_free_pages(GFP_KERNEL, ATMEL_AES_BUFFER_ORDER);
+	dd->buflen = ATMEL_AES_BUFFER_SIZE;
+	dd->buflen &= ~(AES_BLOCK_SIZE - 1);
+
+	if (!dd->buf) {
+		dev_err(dd->dev, "unable to alloc pages.\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
+{
+	free_page((unsigned long)dd->buf);
+}
+
+static int atmel_aes_dma_init(struct atmel_aes_dev *dd)
+{
+	int ret;
+
+	/* Try to grab 2 DMA channels */
+	dd->src.chan = dma_request_chan(dd->dev, "tx");
+	if (IS_ERR(dd->src.chan)) {
+		ret = PTR_ERR(dd->src.chan);
+		goto err_dma_in;
+	}
+
+	dd->dst.chan = dma_request_chan(dd->dev, "rx");
+	if (IS_ERR(dd->dst.chan)) {
+		ret = PTR_ERR(dd->dst.chan);
+		goto err_dma_out;
+	}
+
+	return 0;
+
+err_dma_out:
+	dma_release_channel(dd->src.chan);
+err_dma_in:
+	dev_err(dd->dev, "no DMA channel available\n");
+	return ret;
+}
+
+static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
+{
+	dma_release_channel(dd->dst.chan);
+	dma_release_channel(dd->src.chan);
+}
+
+static void atmel_aes_queue_task(unsigned long data)
+{
+	struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
+
+	atmel_aes_handle_queue(dd, NULL);
+}
+
+static void atmel_aes_done_task(unsigned long data)
+{
+	struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
+
+	dd->is_async = true;
+	(void)dd->resume(dd);
+}
+
+static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
+{
+	struct atmel_aes_dev *aes_dd = dev_id;
+	u32 reg;
+
+	reg = atmel_aes_read(aes_dd, AES_ISR);
+	if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
+		atmel_aes_write(aes_dd, AES_IDR, reg);
+		if (AES_FLAGS_BUSY & aes_dd->flags)
+			tasklet_schedule(&aes_dd->done_task);
+		else
+			dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
+{
+	int i;
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+	if (dd->caps.has_authenc)
+		for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++)
+			crypto_unregister_aead(&aes_authenc_algs[i]);
+#endif
+
+	if (dd->caps.has_xts)
+		crypto_unregister_skcipher(&aes_xts_alg);
+
+	if (dd->caps.has_gcm)
+		crypto_unregister_aead(&aes_gcm_alg);
+
+	if (dd->caps.has_cfb64)
+		crypto_unregister_skcipher(&aes_cfb64_alg);
+
+	for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
+		crypto_unregister_skcipher(&aes_algs[i]);
+}
+
+static void atmel_aes_crypto_alg_init(struct crypto_alg *alg)
+{
+	alg->cra_flags |= CRYPTO_ALG_ASYNC;
+	alg->cra_alignmask = 0xf;
+	alg->cra_priority = ATMEL_AES_PRIORITY;
+	alg->cra_module = THIS_MODULE;
+}
+
+static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
+{
+	int err, i, j;
+
+	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
+		atmel_aes_crypto_alg_init(&aes_algs[i].base);
+
+		err = crypto_register_skcipher(&aes_algs[i]);
+		if (err)
+			goto err_aes_algs;
+	}
+
+	if (dd->caps.has_cfb64) {
+		atmel_aes_crypto_alg_init(&aes_cfb64_alg.base);
+
+		err = crypto_register_skcipher(&aes_cfb64_alg);
+		if (err)
+			goto err_aes_cfb64_alg;
+	}
+
+	if (dd->caps.has_gcm) {
+		atmel_aes_crypto_alg_init(&aes_gcm_alg.base);
+
+		err = crypto_register_aead(&aes_gcm_alg);
+		if (err)
+			goto err_aes_gcm_alg;
+	}
+
+	if (dd->caps.has_xts) {
+		atmel_aes_crypto_alg_init(&aes_xts_alg.base);
+
+		err = crypto_register_skcipher(&aes_xts_alg);
+		if (err)
+			goto err_aes_xts_alg;
+	}
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+	if (dd->caps.has_authenc) {
+		for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++) {
+			atmel_aes_crypto_alg_init(&aes_authenc_algs[i].base);
+
+			err = crypto_register_aead(&aes_authenc_algs[i]);
+			if (err)
+				goto err_aes_authenc_alg;
+		}
+	}
+#endif
+
+	return 0;
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+	/* i = ARRAY_SIZE(aes_authenc_algs); */
+err_aes_authenc_alg:
+	for (j = 0; j < i; j++)
+		crypto_unregister_aead(&aes_authenc_algs[j]);
+	crypto_unregister_skcipher(&aes_xts_alg);
+#endif
+err_aes_xts_alg:
+	crypto_unregister_aead(&aes_gcm_alg);
+err_aes_gcm_alg:
+	crypto_unregister_skcipher(&aes_cfb64_alg);
+err_aes_cfb64_alg:
+	i = ARRAY_SIZE(aes_algs);
+err_aes_algs:
+	for (j = 0; j < i; j++)
+		crypto_unregister_skcipher(&aes_algs[j]);
+
+	return err;
+}
+
+static void atmel_aes_get_cap(struct atmel_aes_dev *dd)
+{
+	dd->caps.has_dualbuff = 0;
+	dd->caps.has_cfb64 = 0;
+	dd->caps.has_gcm = 0;
+	dd->caps.has_xts = 0;
+	dd->caps.has_authenc = 0;
+	dd->caps.max_burst_size = 1;
+
+	/* keep only major version number */
+	switch (dd->hw_version & 0xff0) {
+	case 0x700:
+	case 0x500:
+		dd->caps.has_dualbuff = 1;
+		dd->caps.has_cfb64 = 1;
+		dd->caps.has_gcm = 1;
+		dd->caps.has_xts = 1;
+		dd->caps.has_authenc = 1;
+		dd->caps.max_burst_size = 4;
+		break;
+	case 0x200:
+		dd->caps.has_dualbuff = 1;
+		dd->caps.has_cfb64 = 1;
+		dd->caps.has_gcm = 1;
+		dd->caps.max_burst_size = 4;
+		break;
+	case 0x130:
+		dd->caps.has_dualbuff = 1;
+		dd->caps.has_cfb64 = 1;
+		dd->caps.max_burst_size = 4;
+		break;
+	case 0x120:
+		break;
+	default:
+		dev_warn(dd->dev,
+				"Unmanaged aes version, set minimum capabilities\n");
+		break;
+	}
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_aes_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9g46-aes" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids);
+#endif
+
+static int atmel_aes_probe(struct platform_device *pdev)
+{
+	struct atmel_aes_dev *aes_dd;
+	struct device *dev = &pdev->dev;
+	struct resource *aes_res;
+	int err;
+
+	aes_dd = devm_kzalloc(&pdev->dev, sizeof(*aes_dd), GFP_KERNEL);
+	if (!aes_dd)
+		return -ENOMEM;
+
+	aes_dd->dev = dev;
+
+	platform_set_drvdata(pdev, aes_dd);
+
+	INIT_LIST_HEAD(&aes_dd->list);
+	spin_lock_init(&aes_dd->lock);
+
+	tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
+					(unsigned long)aes_dd);
+	tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
+					(unsigned long)aes_dd);
+
+	crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
+
+	/* Get the base address */
+	aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!aes_res) {
+		dev_err(dev, "no MEM resource info\n");
+		err = -ENODEV;
+		goto err_tasklet_kill;
+	}
+	aes_dd->phys_base = aes_res->start;
+
+	/* Get the IRQ */
+	aes_dd->irq = platform_get_irq(pdev,  0);
+	if (aes_dd->irq < 0) {
+		err = aes_dd->irq;
+		goto err_tasklet_kill;
+	}
+
+	err = devm_request_irq(&pdev->dev, aes_dd->irq, atmel_aes_irq,
+			       IRQF_SHARED, "atmel-aes", aes_dd);
+	if (err) {
+		dev_err(dev, "unable to request aes irq.\n");
+		goto err_tasklet_kill;
+	}
+
+	/* Initializing the clock */
+	aes_dd->iclk = devm_clk_get(&pdev->dev, "aes_clk");
+	if (IS_ERR(aes_dd->iclk)) {
+		dev_err(dev, "clock initialization failed.\n");
+		err = PTR_ERR(aes_dd->iclk);
+		goto err_tasklet_kill;
+	}
+
+	aes_dd->io_base = devm_ioremap_resource(&pdev->dev, aes_res);
+	if (IS_ERR(aes_dd->io_base)) {
+		dev_err(dev, "can't ioremap\n");
+		err = PTR_ERR(aes_dd->io_base);
+		goto err_tasklet_kill;
+	}
+
+	err = clk_prepare(aes_dd->iclk);
+	if (err)
+		goto err_tasklet_kill;
+
+	err = atmel_aes_hw_version_init(aes_dd);
+	if (err)
+		goto err_iclk_unprepare;
+
+	atmel_aes_get_cap(aes_dd);
+
+#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
+	if (aes_dd->caps.has_authenc && !atmel_sha_authenc_is_ready()) {
+		err = -EPROBE_DEFER;
+		goto err_iclk_unprepare;
+	}
+#endif
+
+	err = atmel_aes_buff_init(aes_dd);
+	if (err)
+		goto err_iclk_unprepare;
+
+	err = atmel_aes_dma_init(aes_dd);
+	if (err)
+		goto err_buff_cleanup;
+
+	spin_lock(&atmel_aes.lock);
+	list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
+	spin_unlock(&atmel_aes.lock);
+
+	err = atmel_aes_register_algs(aes_dd);
+	if (err)
+		goto err_algs;
+
+	dev_info(dev, "Atmel AES - Using %s, %s for DMA transfers\n",
+			dma_chan_name(aes_dd->src.chan),
+			dma_chan_name(aes_dd->dst.chan));
+
+	return 0;
+
+err_algs:
+	spin_lock(&atmel_aes.lock);
+	list_del(&aes_dd->list);
+	spin_unlock(&atmel_aes.lock);
+	atmel_aes_dma_cleanup(aes_dd);
+err_buff_cleanup:
+	atmel_aes_buff_cleanup(aes_dd);
+err_iclk_unprepare:
+	clk_unprepare(aes_dd->iclk);
+err_tasklet_kill:
+	tasklet_kill(&aes_dd->done_task);
+	tasklet_kill(&aes_dd->queue_task);
+
+	return err;
+}
+
+static int atmel_aes_remove(struct platform_device *pdev)
+{
+	struct atmel_aes_dev *aes_dd;
+
+	aes_dd = platform_get_drvdata(pdev);
+
+	spin_lock(&atmel_aes.lock);
+	list_del(&aes_dd->list);
+	spin_unlock(&atmel_aes.lock);
+
+	atmel_aes_unregister_algs(aes_dd);
+
+	tasklet_kill(&aes_dd->done_task);
+	tasklet_kill(&aes_dd->queue_task);
+
+	atmel_aes_dma_cleanup(aes_dd);
+	atmel_aes_buff_cleanup(aes_dd);
+
+	clk_unprepare(aes_dd->iclk);
+
+	return 0;
+}
+
+static struct platform_driver atmel_aes_driver = {
+	.probe		= atmel_aes_probe,
+	.remove		= atmel_aes_remove,
+	.driver		= {
+		.name	= "atmel_aes",
+		.of_match_table = of_match_ptr(atmel_aes_dt_ids),
+	},
+};
+
+module_platform_driver(atmel_aes_driver);
+
+MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");