Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 1298 insertions, 0 deletions

diff --git a/drivers/crypto/atmel-tdes.c b/drivers/crypto/atmel-tdes.c
new file mode 100644
index 000000000..8b7bc1076
--- /dev/null
+++ b/drivers/crypto/atmel-tdes.c
@@ -0,0 +1,1298 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cryptographic API.
+ *
+ * Support for ATMEL DES/TDES HW acceleration.
+ *
+ * Copyright (c) 2012 Eukréa Electromatique - ATMEL
+ * Author: Nicolas Royer <nicolas@eukrea.com>
+ *
+ * Some ideas are from omap-aes.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/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/internal/des.h>
+#include <crypto/internal/skcipher.h>
+#include "atmel-tdes-regs.h"
+
+#define ATMEL_TDES_PRIORITY	300
+
+/* TDES flags  */
+/* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */
+#define TDES_FLAGS_ENCRYPT	TDES_MR_CYPHER_ENC
+#define TDES_FLAGS_OPMODE_MASK	(TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK)
+#define TDES_FLAGS_ECB		TDES_MR_OPMOD_ECB
+#define TDES_FLAGS_CBC		TDES_MR_OPMOD_CBC
+#define TDES_FLAGS_OFB		TDES_MR_OPMOD_OFB
+#define TDES_FLAGS_CFB64	(TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b)
+#define TDES_FLAGS_CFB32	(TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b)
+#define TDES_FLAGS_CFB16	(TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b)
+#define TDES_FLAGS_CFB8		(TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b)
+
+#define TDES_FLAGS_MODE_MASK	(TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT)
+
+#define TDES_FLAGS_INIT		BIT(3)
+#define TDES_FLAGS_FAST		BIT(4)
+#define TDES_FLAGS_BUSY		BIT(5)
+#define TDES_FLAGS_DMA		BIT(6)
+
+#define ATMEL_TDES_QUEUE_LENGTH	50
+
+#define CFB8_BLOCK_SIZE		1
+#define CFB16_BLOCK_SIZE	2
+#define CFB32_BLOCK_SIZE	4
+
+struct atmel_tdes_caps {
+	bool	has_dma;
+	u32		has_cfb_3keys;
+};
+
+struct atmel_tdes_dev;
+
+struct atmel_tdes_ctx {
+	struct atmel_tdes_dev *dd;
+
+	int		keylen;
+	u32		key[DES3_EDE_KEY_SIZE / sizeof(u32)];
+	unsigned long	flags;
+
+	u16		block_size;
+};
+
+struct atmel_tdes_reqctx {
+	unsigned long mode;
+	u8 lastc[DES_BLOCK_SIZE];
+};
+
+struct atmel_tdes_dma {
+	struct dma_chan			*chan;
+	struct dma_slave_config dma_conf;
+};
+
+struct atmel_tdes_dev {
+	struct list_head	list;
+	unsigned long		phys_base;
+	void __iomem		*io_base;
+
+	struct atmel_tdes_ctx	*ctx;
+	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;
+
+	struct skcipher_request	*req;
+	size_t				total;
+
+	struct scatterlist	*in_sg;
+	unsigned int		nb_in_sg;
+	size_t				in_offset;
+	struct scatterlist	*out_sg;
+	unsigned int		nb_out_sg;
+	size_t				out_offset;
+
+	size_t	buflen;
+	size_t	dma_size;
+
+	void	*buf_in;
+	int		dma_in;
+	dma_addr_t	dma_addr_in;
+	struct atmel_tdes_dma	dma_lch_in;
+
+	void	*buf_out;
+	int		dma_out;
+	dma_addr_t	dma_addr_out;
+	struct atmel_tdes_dma	dma_lch_out;
+
+	struct atmel_tdes_caps	caps;
+
+	u32	hw_version;
+};
+
+struct atmel_tdes_drv {
+	struct list_head	dev_list;
+	spinlock_t		lock;
+};
+
+static struct atmel_tdes_drv atmel_tdes = {
+	.dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
+	.lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
+};
+
+static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
+			void *buf, size_t buflen, size_t total, int out)
+{
+	size_t count, off = 0;
+
+	while (buflen && total) {
+		count = min((*sg)->length - *offset, total);
+		count = min(count, buflen);
+
+		if (!count)
+			return off;
+
+		scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
+
+		off += count;
+		buflen -= count;
+		*offset += count;
+		total -= count;
+
+		if (*offset == (*sg)->length) {
+			*sg = sg_next(*sg);
+			if (*sg)
+				*offset = 0;
+			else
+				total = 0;
+		}
+	}
+
+	return off;
+}
+
+static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
+{
+	return readl_relaxed(dd->io_base + offset);
+}
+
+static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
+					u32 offset, u32 value)
+{
+	writel_relaxed(value, dd->io_base + offset);
+}
+
+static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
+			       const u32 *value, int count)
+{
+	for (; count--; value++, offset += 4)
+		atmel_tdes_write(dd, offset, *value);
+}
+
+static struct atmel_tdes_dev *atmel_tdes_dev_alloc(void)
+{
+	struct atmel_tdes_dev *tdes_dd;
+
+	spin_lock_bh(&atmel_tdes.lock);
+	/* One TDES IP per SoC. */
+	tdes_dd = list_first_entry_or_null(&atmel_tdes.dev_list,
+					   struct atmel_tdes_dev, list);
+	spin_unlock_bh(&atmel_tdes.lock);
+	return tdes_dd;
+}
+
+static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
+{
+	int err;
+
+	err = clk_prepare_enable(dd->iclk);
+	if (err)
+		return err;
+
+	if (!(dd->flags & TDES_FLAGS_INIT)) {
+		atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
+		dd->flags |= TDES_FLAGS_INIT;
+	}
+
+	return 0;
+}
+
+static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
+{
+	return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
+}
+
+static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
+{
+	int err;
+
+	err = atmel_tdes_hw_init(dd);
+	if (err)
+		return err;
+
+	dd->hw_version = atmel_tdes_get_version(dd);
+
+	dev_info(dd->dev,
+			"version: 0x%x\n", dd->hw_version);
+
+	clk_disable_unprepare(dd->iclk);
+
+	return 0;
+}
+
+static void atmel_tdes_dma_callback(void *data)
+{
+	struct atmel_tdes_dev *dd = data;
+
+	/* dma_lch_out - completed */
+	tasklet_schedule(&dd->done_task);
+}
+
+static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
+{
+	int err;
+	u32 valmr = TDES_MR_SMOD_PDC;
+
+	err = atmel_tdes_hw_init(dd);
+
+	if (err)
+		return err;
+
+	if (!dd->caps.has_dma)
+		atmel_tdes_write(dd, TDES_PTCR,
+			TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
+
+	/* MR register must be set before IV registers */
+	if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
+		valmr |= TDES_MR_KEYMOD_3KEY;
+		valmr |= TDES_MR_TDESMOD_TDES;
+	} else if (dd->ctx->keylen > DES_KEY_SIZE) {
+		valmr |= TDES_MR_KEYMOD_2KEY;
+		valmr |= TDES_MR_TDESMOD_TDES;
+	} else {
+		valmr |= TDES_MR_TDESMOD_DES;
+	}
+
+	valmr |= dd->flags & TDES_FLAGS_MODE_MASK;
+
+	atmel_tdes_write(dd, TDES_MR, valmr);
+
+	atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
+						dd->ctx->keylen >> 2);
+
+	if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB)
+		atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2);
+
+	return 0;
+}
+
+static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
+{
+	int err = 0;
+	size_t count;
+
+	atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
+
+	if (dd->flags & TDES_FLAGS_FAST) {
+		dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
+		dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
+	} else {
+		dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
+					   dd->dma_size, DMA_FROM_DEVICE);
+
+		/* copy data */
+		count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
+				dd->buf_out, dd->buflen, dd->dma_size, 1);
+		if (count != dd->dma_size) {
+			err = -EINVAL;
+			dev_dbg(dd->dev, "not all data converted: %zu\n", count);
+		}
+	}
+
+	return err;
+}
+
+static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
+{
+	int err = -ENOMEM;
+
+	dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
+	dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
+	dd->buflen = PAGE_SIZE;
+	dd->buflen &= ~(DES_BLOCK_SIZE - 1);
+
+	if (!dd->buf_in || !dd->buf_out) {
+		dev_dbg(dd->dev, "unable to alloc pages.\n");
+		goto err_alloc;
+	}
+
+	/* MAP here */
+	dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
+					dd->buflen, DMA_TO_DEVICE);
+	err = dma_mapping_error(dd->dev, dd->dma_addr_in);
+	if (err) {
+		dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
+		goto err_map_in;
+	}
+
+	dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
+					dd->buflen, DMA_FROM_DEVICE);
+	err = dma_mapping_error(dd->dev, dd->dma_addr_out);
+	if (err) {
+		dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
+		goto err_map_out;
+	}
+
+	return 0;
+
+err_map_out:
+	dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
+		DMA_TO_DEVICE);
+err_map_in:
+err_alloc:
+	free_page((unsigned long)dd->buf_out);
+	free_page((unsigned long)dd->buf_in);
+	return err;
+}
+
+static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
+{
+	dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
+			 DMA_FROM_DEVICE);
+	dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
+		DMA_TO_DEVICE);
+	free_page((unsigned long)dd->buf_out);
+	free_page((unsigned long)dd->buf_in);
+}
+
+static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
+				dma_addr_t dma_addr_in,
+				dma_addr_t dma_addr_out, int length)
+{
+	struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
+	int len32;
+
+	dd->dma_size = length;
+
+	if (!(dd->flags & TDES_FLAGS_FAST)) {
+		dma_sync_single_for_device(dd->dev, dma_addr_in, length,
+					   DMA_TO_DEVICE);
+	}
+
+	switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
+	case TDES_FLAGS_CFB8:
+		len32 = DIV_ROUND_UP(length, sizeof(u8));
+		break;
+
+	case TDES_FLAGS_CFB16:
+		len32 = DIV_ROUND_UP(length, sizeof(u16));
+		break;
+
+	default:
+		len32 = DIV_ROUND_UP(length, sizeof(u32));
+		break;
+	}
+
+	atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
+	atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
+	atmel_tdes_write(dd, TDES_TCR, len32);
+	atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
+	atmel_tdes_write(dd, TDES_RCR, len32);
+
+	/* Enable Interrupt */
+	atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
+
+	/* Start DMA transfer */
+	atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
+
+	return 0;
+}
+
+static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
+				dma_addr_t dma_addr_in,
+				dma_addr_t dma_addr_out, int length)
+{
+	struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
+	struct scatterlist sg[2];
+	struct dma_async_tx_descriptor	*in_desc, *out_desc;
+	enum dma_slave_buswidth addr_width;
+
+	dd->dma_size = length;
+
+	if (!(dd->flags & TDES_FLAGS_FAST)) {
+		dma_sync_single_for_device(dd->dev, dma_addr_in, length,
+					   DMA_TO_DEVICE);
+	}
+
+	switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
+	case TDES_FLAGS_CFB8:
+		addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+		break;
+
+	case TDES_FLAGS_CFB16:
+		addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+		break;
+
+	default:
+		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+		break;
+	}
+
+	dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
+	dd->dma_lch_out.dma_conf.src_addr_width = addr_width;
+
+	dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
+	dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
+
+	dd->flags |= TDES_FLAGS_DMA;
+
+	sg_init_table(&sg[0], 1);
+	sg_dma_address(&sg[0]) = dma_addr_in;
+	sg_dma_len(&sg[0]) = length;
+
+	sg_init_table(&sg[1], 1);
+	sg_dma_address(&sg[1]) = dma_addr_out;
+	sg_dma_len(&sg[1]) = length;
+
+	in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
+				1, DMA_MEM_TO_DEV,
+				DMA_PREP_INTERRUPT  |  DMA_CTRL_ACK);
+	if (!in_desc)
+		return -EINVAL;
+
+	out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
+				1, DMA_DEV_TO_MEM,
+				DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!out_desc)
+		return -EINVAL;
+
+	out_desc->callback = atmel_tdes_dma_callback;
+	out_desc->callback_param = dd;
+
+	dmaengine_submit(out_desc);
+	dma_async_issue_pending(dd->dma_lch_out.chan);
+
+	dmaengine_submit(in_desc);
+	dma_async_issue_pending(dd->dma_lch_in.chan);
+
+	return 0;
+}
+
+static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
+{
+	int err, fast = 0, in, out;
+	size_t count;
+	dma_addr_t addr_in, addr_out;
+
+	if ((!dd->in_offset) && (!dd->out_offset)) {
+		/* check for alignment */
+		in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
+			IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
+		out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
+			IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
+		fast = in && out;
+
+		if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
+			fast = 0;
+	}
+
+
+	if (fast)  {
+		count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
+		count = min_t(size_t, count, sg_dma_len(dd->out_sg));
+
+		err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
+		if (!err) {
+			dev_dbg(dd->dev, "dma_map_sg() error\n");
+			return -EINVAL;
+		}
+
+		err = dma_map_sg(dd->dev, dd->out_sg, 1,
+				DMA_FROM_DEVICE);
+		if (!err) {
+			dev_dbg(dd->dev, "dma_map_sg() error\n");
+			dma_unmap_sg(dd->dev, dd->in_sg, 1,
+				DMA_TO_DEVICE);
+			return -EINVAL;
+		}
+
+		addr_in = sg_dma_address(dd->in_sg);
+		addr_out = sg_dma_address(dd->out_sg);
+
+		dd->flags |= TDES_FLAGS_FAST;
+
+	} else {
+		/* use cache buffers */
+		count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
+				dd->buf_in, dd->buflen, dd->total, 0);
+
+		addr_in = dd->dma_addr_in;
+		addr_out = dd->dma_addr_out;
+
+		dd->flags &= ~TDES_FLAGS_FAST;
+	}
+
+	dd->total -= count;
+
+	if (dd->caps.has_dma)
+		err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count);
+	else
+		err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count);
+
+	if (err && (dd->flags & TDES_FLAGS_FAST)) {
+		dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
+		dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
+	}
+
+	return err;
+}
+
+static void
+atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd)
+{
+	struct skcipher_request *req = dd->req;
+	struct atmel_tdes_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 & TDES_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 void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
+{
+	struct skcipher_request *req = dd->req;
+	struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
+
+	clk_disable_unprepare(dd->iclk);
+
+	dd->flags &= ~TDES_FLAGS_BUSY;
+
+	if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB)
+		atmel_tdes_set_iv_as_last_ciphertext_block(dd);
+
+	req->base.complete(&req->base, err);
+}
+
+static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
+			       struct skcipher_request *req)
+{
+	struct crypto_async_request *async_req, *backlog;
+	struct atmel_tdes_ctx *ctx;
+	struct atmel_tdes_reqctx *rctx;
+	unsigned long flags;
+	int err, ret = 0;
+
+	spin_lock_irqsave(&dd->lock, flags);
+	if (req)
+		ret = crypto_enqueue_request(&dd->queue, &req->base);
+	if (dd->flags & TDES_FLAGS_BUSY) {
+		spin_unlock_irqrestore(&dd->lock, flags);
+		return ret;
+	}
+	backlog = crypto_get_backlog(&dd->queue);
+	async_req = crypto_dequeue_request(&dd->queue);
+	if (async_req)
+		dd->flags |= TDES_FLAGS_BUSY;
+	spin_unlock_irqrestore(&dd->lock, flags);
+
+	if (!async_req)
+		return ret;
+
+	if (backlog)
+		backlog->complete(backlog, -EINPROGRESS);
+
+	req = skcipher_request_cast(async_req);
+
+	/* assign new request to device */
+	dd->req = req;
+	dd->total = req->cryptlen;
+	dd->in_offset = 0;
+	dd->in_sg = req->src;
+	dd->out_offset = 0;
+	dd->out_sg = req->dst;
+
+	rctx = skcipher_request_ctx(req);
+	ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	rctx->mode &= TDES_FLAGS_MODE_MASK;
+	dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
+	dd->ctx = ctx;
+
+	err = atmel_tdes_write_ctrl(dd);
+	if (!err)
+		err = atmel_tdes_crypt_start(dd);
+	if (err) {
+		/* des_task will not finish it, so do it here */
+		atmel_tdes_finish_req(dd, err);
+		tasklet_schedule(&dd->queue_task);
+	}
+
+	return ret;
+}
+
+static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
+{
+	int err = -EINVAL;
+	size_t count;
+
+	if (dd->flags & TDES_FLAGS_DMA) {
+		err = 0;
+		if  (dd->flags & TDES_FLAGS_FAST) {
+			dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
+			dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
+		} else {
+			dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
+				dd->dma_size, DMA_FROM_DEVICE);
+
+			/* copy data */
+			count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
+				dd->buf_out, dd->buflen, dd->dma_size, 1);
+			if (count != dd->dma_size) {
+				err = -EINVAL;
+				dev_dbg(dd->dev, "not all data converted: %zu\n", count);
+			}
+		}
+	}
+	return err;
+}
+
+static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher);
+	struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
+	struct device *dev = ctx->dd->dev;
+
+	if (!req->cryptlen)
+		return 0;
+
+	switch (mode & TDES_FLAGS_OPMODE_MASK) {
+	case TDES_FLAGS_CFB8:
+		if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {
+			dev_dbg(dev, "request size is not exact amount of CFB8 blocks\n");
+			return -EINVAL;
+		}
+		ctx->block_size = CFB8_BLOCK_SIZE;
+		break;
+
+	case TDES_FLAGS_CFB16:
+		if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) {
+			dev_dbg(dev, "request size is not exact amount of CFB16 blocks\n");
+			return -EINVAL;
+		}
+		ctx->block_size = CFB16_BLOCK_SIZE;
+		break;
+
+	case TDES_FLAGS_CFB32:
+		if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) {
+			dev_dbg(dev, "request size is not exact amount of CFB32 blocks\n");
+			return -EINVAL;
+		}
+		ctx->block_size = CFB32_BLOCK_SIZE;
+		break;
+
+	default:
+		if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) {
+			dev_dbg(dev, "request size is not exact amount of DES blocks\n");
+			return -EINVAL;
+		}
+		ctx->block_size = DES_BLOCK_SIZE;
+		break;
+	}
+
+	rctx->mode = mode;
+
+	if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB &&
+	    !(mode & TDES_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_tdes_handle_queue(ctx->dd, req);
+}
+
+static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd)
+{
+	int ret;
+
+	/* Try to grab 2 DMA channels */
+	dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
+	if (IS_ERR(dd->dma_lch_in.chan)) {
+		ret = PTR_ERR(dd->dma_lch_in.chan);
+		goto err_dma_in;
+	}
+
+	dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
+		TDES_IDATA1R;
+	dd->dma_lch_in.dma_conf.src_maxburst = 1;
+	dd->dma_lch_in.dma_conf.src_addr_width =
+		DMA_SLAVE_BUSWIDTH_4_BYTES;
+	dd->dma_lch_in.dma_conf.dst_maxburst = 1;
+	dd->dma_lch_in.dma_conf.dst_addr_width =
+		DMA_SLAVE_BUSWIDTH_4_BYTES;
+	dd->dma_lch_in.dma_conf.device_fc = false;
+
+	dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx");
+	if (IS_ERR(dd->dma_lch_out.chan)) {
+		ret = PTR_ERR(dd->dma_lch_out.chan);
+		goto err_dma_out;
+	}
+
+	dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
+		TDES_ODATA1R;
+	dd->dma_lch_out.dma_conf.src_maxburst = 1;
+	dd->dma_lch_out.dma_conf.src_addr_width =
+		DMA_SLAVE_BUSWIDTH_4_BYTES;
+	dd->dma_lch_out.dma_conf.dst_maxburst = 1;
+	dd->dma_lch_out.dma_conf.dst_addr_width =
+		DMA_SLAVE_BUSWIDTH_4_BYTES;
+	dd->dma_lch_out.dma_conf.device_fc = false;
+
+	return 0;
+
+err_dma_out:
+	dma_release_channel(dd->dma_lch_in.chan);
+err_dma_in:
+	dev_err(dd->dev, "no DMA channel available\n");
+	return ret;
+}
+
+static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
+{
+	dma_release_channel(dd->dma_lch_in.chan);
+	dma_release_channel(dd->dma_lch_out.chan);
+}
+
+static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
+			   unsigned int keylen)
+{
+	struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
+	int err;
+
+	err = verify_skcipher_des_key(tfm, key);
+	if (err)
+		return err;
+
+	memcpy(ctx->key, key, keylen);
+	ctx->keylen = keylen;
+
+	return 0;
+}
+
+static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+			   unsigned int keylen)
+{
+	struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
+	int err;
+
+	err = verify_skcipher_des3_key(tfm, key);
+	if (err)
+		return err;
+
+	memcpy(ctx->key, key, keylen);
+	ctx->keylen = keylen;
+
+	return 0;
+}
+
+static int atmel_tdes_ecb_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_ecb_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_ECB);
+}
+
+static int atmel_tdes_cbc_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_cbc_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
+}
+static int atmel_tdes_cfb_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_cfb_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB64);
+}
+
+static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB8);
+}
+
+static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB16);
+}
+
+static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_CFB32);
+}
+
+static int atmel_tdes_ofb_encrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT);
+}
+
+static int atmel_tdes_ofb_decrypt(struct skcipher_request *req)
+{
+	return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
+}
+
+static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm)
+{
+	struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	ctx->dd = atmel_tdes_dev_alloc();
+	if (!ctx->dd)
+		return -ENODEV;
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
+
+	return 0;
+}
+
+static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg)
+{
+	alg->base.cra_priority = ATMEL_TDES_PRIORITY;
+	alg->base.cra_flags = CRYPTO_ALG_ASYNC;
+	alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx);
+	alg->base.cra_module = THIS_MODULE;
+
+	alg->init = atmel_tdes_init_tfm;
+}
+
+static struct skcipher_alg tdes_algs[] = {
+{
+	.base.cra_name		= "ecb(des)",
+	.base.cra_driver_name	= "atmel-ecb-des",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_ecb_encrypt,
+	.decrypt		= atmel_tdes_ecb_decrypt,
+},
+{
+	.base.cra_name		= "cbc(des)",
+	.base.cra_driver_name	= "atmel-cbc-des",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_cbc_encrypt,
+	.decrypt		= atmel_tdes_cbc_decrypt,
+},
+{
+	.base.cra_name		= "cfb(des)",
+	.base.cra_driver_name	= "atmel-cfb-des",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_cfb_encrypt,
+	.decrypt		= atmel_tdes_cfb_decrypt,
+},
+{
+	.base.cra_name		= "cfb8(des)",
+	.base.cra_driver_name	= "atmel-cfb8-des",
+	.base.cra_blocksize	= CFB8_BLOCK_SIZE,
+	.base.cra_alignmask	= 0,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_cfb8_encrypt,
+	.decrypt		= atmel_tdes_cfb8_decrypt,
+},
+{
+	.base.cra_name		= "cfb16(des)",
+	.base.cra_driver_name	= "atmel-cfb16-des",
+	.base.cra_blocksize	= CFB16_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x1,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_cfb16_encrypt,
+	.decrypt		= atmel_tdes_cfb16_decrypt,
+},
+{
+	.base.cra_name		= "cfb32(des)",
+	.base.cra_driver_name	= "atmel-cfb32-des",
+	.base.cra_blocksize	= CFB32_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x3,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_cfb32_encrypt,
+	.decrypt		= atmel_tdes_cfb32_decrypt,
+},
+{
+	.base.cra_name		= "ofb(des)",
+	.base.cra_driver_name	= "atmel-ofb-des",
+	.base.cra_blocksize	= 1,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES_KEY_SIZE,
+	.max_keysize		= DES_KEY_SIZE,
+	.ivsize			= DES_BLOCK_SIZE,
+	.setkey			= atmel_des_setkey,
+	.encrypt		= atmel_tdes_ofb_encrypt,
+	.decrypt		= atmel_tdes_ofb_decrypt,
+},
+{
+	.base.cra_name		= "ecb(des3_ede)",
+	.base.cra_driver_name	= "atmel-ecb-tdes",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES3_EDE_KEY_SIZE,
+	.max_keysize		= DES3_EDE_KEY_SIZE,
+	.setkey			= atmel_tdes_setkey,
+	.encrypt		= atmel_tdes_ecb_encrypt,
+	.decrypt		= atmel_tdes_ecb_decrypt,
+},
+{
+	.base.cra_name		= "cbc(des3_ede)",
+	.base.cra_driver_name	= "atmel-cbc-tdes",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES3_EDE_KEY_SIZE,
+	.max_keysize		= DES3_EDE_KEY_SIZE,
+	.setkey			= atmel_tdes_setkey,
+	.encrypt		= atmel_tdes_cbc_encrypt,
+	.decrypt		= atmel_tdes_cbc_decrypt,
+	.ivsize			= DES_BLOCK_SIZE,
+},
+{
+	.base.cra_name		= "ofb(des3_ede)",
+	.base.cra_driver_name	= "atmel-ofb-tdes",
+	.base.cra_blocksize	= DES_BLOCK_SIZE,
+	.base.cra_alignmask	= 0x7,
+
+	.min_keysize		= DES3_EDE_KEY_SIZE,
+	.max_keysize		= DES3_EDE_KEY_SIZE,
+	.setkey			= atmel_tdes_setkey,
+	.encrypt		= atmel_tdes_ofb_encrypt,
+	.decrypt		= atmel_tdes_ofb_decrypt,
+	.ivsize			= DES_BLOCK_SIZE,
+},
+};
+
+static void atmel_tdes_queue_task(unsigned long data)
+{
+	struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
+
+	atmel_tdes_handle_queue(dd, NULL);
+}
+
+static void atmel_tdes_done_task(unsigned long data)
+{
+	struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
+	int err;
+
+	if (!(dd->flags & TDES_FLAGS_DMA))
+		err = atmel_tdes_crypt_pdc_stop(dd);
+	else
+		err = atmel_tdes_crypt_dma_stop(dd);
+
+	if (dd->total && !err) {
+		if (dd->flags & TDES_FLAGS_FAST) {
+			dd->in_sg = sg_next(dd->in_sg);
+			dd->out_sg = sg_next(dd->out_sg);
+			if (!dd->in_sg || !dd->out_sg)
+				err = -EINVAL;
+		}
+		if (!err)
+			err = atmel_tdes_crypt_start(dd);
+		if (!err)
+			return; /* DMA started. Not fininishing. */
+	}
+
+	atmel_tdes_finish_req(dd, err);
+	atmel_tdes_handle_queue(dd, NULL);
+}
+
+static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
+{
+	struct atmel_tdes_dev *tdes_dd = dev_id;
+	u32 reg;
+
+	reg = atmel_tdes_read(tdes_dd, TDES_ISR);
+	if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
+		atmel_tdes_write(tdes_dd, TDES_IDR, reg);
+		if (TDES_FLAGS_BUSY & tdes_dd->flags)
+			tasklet_schedule(&tdes_dd->done_task);
+		else
+			dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
+		crypto_unregister_skcipher(&tdes_algs[i]);
+}
+
+static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
+{
+	int err, i, j;
+
+	for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
+		atmel_tdes_skcipher_alg_init(&tdes_algs[i]);
+
+		err = crypto_register_skcipher(&tdes_algs[i]);
+		if (err)
+			goto err_tdes_algs;
+	}
+
+	return 0;
+
+err_tdes_algs:
+	for (j = 0; j < i; j++)
+		crypto_unregister_skcipher(&tdes_algs[j]);
+
+	return err;
+}
+
+static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
+{
+
+	dd->caps.has_dma = 0;
+	dd->caps.has_cfb_3keys = 0;
+
+	/* keep only major version number */
+	switch (dd->hw_version & 0xf00) {
+	case 0x800:
+	case 0x700:
+		dd->caps.has_dma = 1;
+		dd->caps.has_cfb_3keys = 1;
+		break;
+	case 0x600:
+		break;
+	default:
+		dev_warn(dd->dev,
+				"Unmanaged tdes version, set minimum capabilities\n");
+		break;
+	}
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_tdes_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9g46-tdes" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
+#endif
+
+static int atmel_tdes_probe(struct platform_device *pdev)
+{
+	struct atmel_tdes_dev *tdes_dd;
+	struct device *dev = &pdev->dev;
+	struct resource *tdes_res;
+	int err;
+
+	tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
+	if (!tdes_dd)
+		return -ENOMEM;
+
+	tdes_dd->dev = dev;
+
+	platform_set_drvdata(pdev, tdes_dd);
+
+	INIT_LIST_HEAD(&tdes_dd->list);
+	spin_lock_init(&tdes_dd->lock);
+
+	tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
+					(unsigned long)tdes_dd);
+	tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
+					(unsigned long)tdes_dd);
+
+	crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
+
+	/* Get the base address */
+	tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!tdes_res) {
+		dev_err(dev, "no MEM resource info\n");
+		err = -ENODEV;
+		goto err_tasklet_kill;
+	}
+	tdes_dd->phys_base = tdes_res->start;
+
+	/* Get the IRQ */
+	tdes_dd->irq = platform_get_irq(pdev,  0);
+	if (tdes_dd->irq < 0) {
+		err = tdes_dd->irq;
+		goto err_tasklet_kill;
+	}
+
+	err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
+			       IRQF_SHARED, "atmel-tdes", tdes_dd);
+	if (err) {
+		dev_err(dev, "unable to request tdes irq.\n");
+		goto err_tasklet_kill;
+	}
+
+	/* Initializing the clock */
+	tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
+	if (IS_ERR(tdes_dd->iclk)) {
+		dev_err(dev, "clock initialization failed.\n");
+		err = PTR_ERR(tdes_dd->iclk);
+		goto err_tasklet_kill;
+	}
+
+	tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
+	if (IS_ERR(tdes_dd->io_base)) {
+		err = PTR_ERR(tdes_dd->io_base);
+		goto err_tasklet_kill;
+	}
+
+	err = atmel_tdes_hw_version_init(tdes_dd);
+	if (err)
+		goto err_tasklet_kill;
+
+	atmel_tdes_get_cap(tdes_dd);
+
+	err = atmel_tdes_buff_init(tdes_dd);
+	if (err)
+		goto err_tasklet_kill;
+
+	if (tdes_dd->caps.has_dma) {
+		err = atmel_tdes_dma_init(tdes_dd);
+		if (err)
+			goto err_buff_cleanup;
+
+		dev_info(dev, "using %s, %s for DMA transfers\n",
+				dma_chan_name(tdes_dd->dma_lch_in.chan),
+				dma_chan_name(tdes_dd->dma_lch_out.chan));
+	}
+
+	spin_lock(&atmel_tdes.lock);
+	list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
+	spin_unlock(&atmel_tdes.lock);
+
+	err = atmel_tdes_register_algs(tdes_dd);
+	if (err)
+		goto err_algs;
+
+	dev_info(dev, "Atmel DES/TDES\n");
+
+	return 0;
+
+err_algs:
+	spin_lock(&atmel_tdes.lock);
+	list_del(&tdes_dd->list);
+	spin_unlock(&atmel_tdes.lock);
+	if (tdes_dd->caps.has_dma)
+		atmel_tdes_dma_cleanup(tdes_dd);
+err_buff_cleanup:
+	atmel_tdes_buff_cleanup(tdes_dd);
+err_tasklet_kill:
+	tasklet_kill(&tdes_dd->done_task);
+	tasklet_kill(&tdes_dd->queue_task);
+
+	return err;
+}
+
+static int atmel_tdes_remove(struct platform_device *pdev)
+{
+	struct atmel_tdes_dev *tdes_dd = platform_get_drvdata(pdev);
+
+	spin_lock(&atmel_tdes.lock);
+	list_del(&tdes_dd->list);
+	spin_unlock(&atmel_tdes.lock);
+
+	atmel_tdes_unregister_algs(tdes_dd);
+
+	tasklet_kill(&tdes_dd->done_task);
+	tasklet_kill(&tdes_dd->queue_task);
+
+	if (tdes_dd->caps.has_dma)
+		atmel_tdes_dma_cleanup(tdes_dd);
+
+	atmel_tdes_buff_cleanup(tdes_dd);
+
+	return 0;
+}
+
+static struct platform_driver atmel_tdes_driver = {
+	.probe		= atmel_tdes_probe,
+	.remove		= atmel_tdes_remove,
+	.driver		= {
+		.name	= "atmel_tdes",
+		.of_match_table = of_match_ptr(atmel_tdes_dt_ids),
+	},
+};
+
+module_platform_driver(atmel_tdes_driver);
+
+MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");