Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 1511 insertions, 0 deletions

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
new file mode 100644
index 0000000000..8e84dd98a2
--- /dev/null
+++ b/drivers/crypto/sahara.c
@@ -0,0 +1,1511 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Cryptographic API.
+ *
+ * Support for SAHARA cryptographic accelerator.
+ *
+ * Copyright (c) 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ * Copyright (c) 2013 Vista Silicon S.L.
+ * Author: Javier Martin <javier.martin@vista-silicon.com>
+ *
+ * Based on omap-aes.c and tegra-aes.c
+ */
+
+#include <crypto/aes.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/sha1.h>
+#include <crypto/sha2.h>
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define SHA_BUFFER_LEN		PAGE_SIZE
+#define SAHARA_MAX_SHA_BLOCK_SIZE	SHA256_BLOCK_SIZE
+
+#define SAHARA_NAME "sahara"
+#define SAHARA_VERSION_3	3
+#define SAHARA_VERSION_4	4
+#define SAHARA_TIMEOUT_MS	1000
+#define SAHARA_MAX_HW_DESC	2
+#define SAHARA_MAX_HW_LINK	20
+
+#define FLAGS_MODE_MASK		0x000f
+#define FLAGS_ENCRYPT		BIT(0)
+#define FLAGS_CBC		BIT(1)
+
+#define SAHARA_HDR_BASE			0x00800000
+#define SAHARA_HDR_SKHA_ALG_AES	0
+#define SAHARA_HDR_SKHA_OP_ENC		(1 << 2)
+#define SAHARA_HDR_SKHA_MODE_ECB	(0 << 3)
+#define SAHARA_HDR_SKHA_MODE_CBC	(1 << 3)
+#define SAHARA_HDR_FORM_DATA		(5 << 16)
+#define SAHARA_HDR_FORM_KEY		(8 << 16)
+#define SAHARA_HDR_LLO			(1 << 24)
+#define SAHARA_HDR_CHA_SKHA		(1 << 28)
+#define SAHARA_HDR_CHA_MDHA		(2 << 28)
+#define SAHARA_HDR_PARITY_BIT		(1 << 31)
+
+#define SAHARA_HDR_MDHA_SET_MODE_MD_KEY	0x20880000
+#define SAHARA_HDR_MDHA_SET_MODE_HASH	0x208D0000
+#define SAHARA_HDR_MDHA_HASH		0xA0850000
+#define SAHARA_HDR_MDHA_STORE_DIGEST	0x20820000
+#define SAHARA_HDR_MDHA_ALG_SHA1	0
+#define SAHARA_HDR_MDHA_ALG_MD5		1
+#define SAHARA_HDR_MDHA_ALG_SHA256	2
+#define SAHARA_HDR_MDHA_ALG_SHA224	3
+#define SAHARA_HDR_MDHA_PDATA		(1 << 2)
+#define SAHARA_HDR_MDHA_HMAC		(1 << 3)
+#define SAHARA_HDR_MDHA_INIT		(1 << 5)
+#define SAHARA_HDR_MDHA_IPAD		(1 << 6)
+#define SAHARA_HDR_MDHA_OPAD		(1 << 7)
+#define SAHARA_HDR_MDHA_SWAP		(1 << 8)
+#define SAHARA_HDR_MDHA_MAC_FULL	(1 << 9)
+#define SAHARA_HDR_MDHA_SSL		(1 << 10)
+
+/* SAHARA can only process one request at a time */
+#define SAHARA_QUEUE_LENGTH	1
+
+#define SAHARA_REG_VERSION	0x00
+#define SAHARA_REG_DAR		0x04
+#define SAHARA_REG_CONTROL	0x08
+#define		SAHARA_CONTROL_SET_THROTTLE(x)	(((x) & 0xff) << 24)
+#define		SAHARA_CONTROL_SET_MAXBURST(x)	(((x) & 0xff) << 16)
+#define		SAHARA_CONTROL_RNG_AUTORSD	(1 << 7)
+#define		SAHARA_CONTROL_ENABLE_INT	(1 << 4)
+#define SAHARA_REG_CMD		0x0C
+#define		SAHARA_CMD_RESET		(1 << 0)
+#define		SAHARA_CMD_CLEAR_INT		(1 << 8)
+#define		SAHARA_CMD_CLEAR_ERR		(1 << 9)
+#define		SAHARA_CMD_SINGLE_STEP		(1 << 10)
+#define		SAHARA_CMD_MODE_BATCH		(1 << 16)
+#define		SAHARA_CMD_MODE_DEBUG		(1 << 18)
+#define	SAHARA_REG_STATUS	0x10
+#define		SAHARA_STATUS_GET_STATE(x)	((x) & 0x7)
+#define			SAHARA_STATE_IDLE	0
+#define			SAHARA_STATE_BUSY	1
+#define			SAHARA_STATE_ERR	2
+#define			SAHARA_STATE_FAULT	3
+#define			SAHARA_STATE_COMPLETE	4
+#define			SAHARA_STATE_COMP_FLAG	(1 << 2)
+#define		SAHARA_STATUS_DAR_FULL		(1 << 3)
+#define		SAHARA_STATUS_ERROR		(1 << 4)
+#define		SAHARA_STATUS_SECURE		(1 << 5)
+#define		SAHARA_STATUS_FAIL		(1 << 6)
+#define		SAHARA_STATUS_INIT		(1 << 7)
+#define		SAHARA_STATUS_RNG_RESEED	(1 << 8)
+#define		SAHARA_STATUS_ACTIVE_RNG	(1 << 9)
+#define		SAHARA_STATUS_ACTIVE_MDHA	(1 << 10)
+#define		SAHARA_STATUS_ACTIVE_SKHA	(1 << 11)
+#define		SAHARA_STATUS_MODE_BATCH	(1 << 16)
+#define		SAHARA_STATUS_MODE_DEDICATED	(1 << 17)
+#define		SAHARA_STATUS_MODE_DEBUG	(1 << 18)
+#define		SAHARA_STATUS_GET_ISTATE(x)	(((x) >> 24) & 0xff)
+#define SAHARA_REG_ERRSTATUS	0x14
+#define		SAHARA_ERRSTATUS_GET_SOURCE(x)	((x) & 0xf)
+#define			SAHARA_ERRSOURCE_CHA	14
+#define			SAHARA_ERRSOURCE_DMA	15
+#define		SAHARA_ERRSTATUS_DMA_DIR	(1 << 8)
+#define		SAHARA_ERRSTATUS_GET_DMASZ(x)(((x) >> 9) & 0x3)
+#define		SAHARA_ERRSTATUS_GET_DMASRC(x) (((x) >> 13) & 0x7)
+#define		SAHARA_ERRSTATUS_GET_CHASRC(x)	(((x) >> 16) & 0xfff)
+#define		SAHARA_ERRSTATUS_GET_CHAERR(x)	(((x) >> 28) & 0x3)
+#define SAHARA_REG_FADDR	0x18
+#define SAHARA_REG_CDAR		0x1C
+#define SAHARA_REG_IDAR		0x20
+
+struct sahara_hw_desc {
+	u32	hdr;
+	u32	len1;
+	u32	p1;
+	u32	len2;
+	u32	p2;
+	u32	next;
+};
+
+struct sahara_hw_link {
+	u32	len;
+	u32	p;
+	u32	next;
+};
+
+struct sahara_ctx {
+	/* AES-specific context */
+	int keylen;
+	u8 key[AES_KEYSIZE_128];
+	struct crypto_skcipher *fallback;
+};
+
+struct sahara_aes_reqctx {
+	unsigned long mode;
+	u8 iv_out[AES_BLOCK_SIZE];
+	struct skcipher_request fallback_req;	// keep at the end
+};
+
+/*
+ * struct sahara_sha_reqctx - private data per request
+ * @buf: holds data for requests smaller than block_size
+ * @rembuf: used to prepare one block_size-aligned request
+ * @context: hw-specific context for request. Digest is extracted from this
+ * @mode: specifies what type of hw-descriptor needs to be built
+ * @digest_size: length of digest for this request
+ * @context_size: length of hw-context for this request.
+ *                Always digest_size + 4
+ * @buf_cnt: number of bytes saved in buf
+ * @sg_in_idx: number of hw links
+ * @in_sg: scatterlist for input data
+ * @in_sg_chain: scatterlists for chained input data
+ * @total: total number of bytes for transfer
+ * @last: is this the last block
+ * @first: is this the first block
+ * @active: inside a transfer
+ */
+struct sahara_sha_reqctx {
+	u8			buf[SAHARA_MAX_SHA_BLOCK_SIZE];
+	u8			rembuf[SAHARA_MAX_SHA_BLOCK_SIZE];
+	u8			context[SHA256_DIGEST_SIZE + 4];
+	unsigned int		mode;
+	unsigned int		digest_size;
+	unsigned int		context_size;
+	unsigned int		buf_cnt;
+	unsigned int		sg_in_idx;
+	struct scatterlist	*in_sg;
+	struct scatterlist	in_sg_chain[2];
+	size_t			total;
+	unsigned int		last;
+	unsigned int		first;
+	unsigned int		active;
+};
+
+struct sahara_dev {
+	struct device		*device;
+	unsigned int		version;
+	void __iomem		*regs_base;
+	struct clk		*clk_ipg;
+	struct clk		*clk_ahb;
+	spinlock_t		queue_spinlock;
+	struct task_struct	*kthread;
+	struct completion	dma_completion;
+
+	struct sahara_ctx	*ctx;
+	struct crypto_queue	queue;
+	unsigned long		flags;
+
+	struct sahara_hw_desc	*hw_desc[SAHARA_MAX_HW_DESC];
+	dma_addr_t		hw_phys_desc[SAHARA_MAX_HW_DESC];
+
+	u8			*key_base;
+	dma_addr_t		key_phys_base;
+
+	u8			*iv_base;
+	dma_addr_t		iv_phys_base;
+
+	u8			*context_base;
+	dma_addr_t		context_phys_base;
+
+	struct sahara_hw_link	*hw_link[SAHARA_MAX_HW_LINK];
+	dma_addr_t		hw_phys_link[SAHARA_MAX_HW_LINK];
+
+	size_t			total;
+	struct scatterlist	*in_sg;
+	int		nb_in_sg;
+	struct scatterlist	*out_sg;
+	int		nb_out_sg;
+
+	u32			error;
+};
+
+static struct sahara_dev *dev_ptr;
+
+static inline void sahara_write(struct sahara_dev *dev, u32 data, u32 reg)
+{
+	writel(data, dev->regs_base + reg);
+}
+
+static inline unsigned int sahara_read(struct sahara_dev *dev, u32 reg)
+{
+	return readl(dev->regs_base + reg);
+}
+
+static u32 sahara_aes_key_hdr(struct sahara_dev *dev)
+{
+	u32 hdr = SAHARA_HDR_BASE | SAHARA_HDR_SKHA_ALG_AES |
+			SAHARA_HDR_FORM_KEY | SAHARA_HDR_LLO |
+			SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
+
+	if (dev->flags & FLAGS_CBC) {
+		hdr |= SAHARA_HDR_SKHA_MODE_CBC;
+		hdr ^= SAHARA_HDR_PARITY_BIT;
+	}
+
+	if (dev->flags & FLAGS_ENCRYPT) {
+		hdr |= SAHARA_HDR_SKHA_OP_ENC;
+		hdr ^= SAHARA_HDR_PARITY_BIT;
+	}
+
+	return hdr;
+}
+
+static u32 sahara_aes_data_link_hdr(struct sahara_dev *dev)
+{
+	return SAHARA_HDR_BASE | SAHARA_HDR_FORM_DATA |
+			SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
+}
+
+static const char *sahara_err_src[16] = {
+	"No error",
+	"Header error",
+	"Descriptor length error",
+	"Descriptor length or pointer error",
+	"Link length error",
+	"Link pointer error",
+	"Input buffer error",
+	"Output buffer error",
+	"Output buffer starvation",
+	"Internal state fault",
+	"General descriptor problem",
+	"Reserved",
+	"Descriptor address error",
+	"Link address error",
+	"CHA error",
+	"DMA error"
+};
+
+static const char *sahara_err_dmasize[4] = {
+	"Byte transfer",
+	"Half-word transfer",
+	"Word transfer",
+	"Reserved"
+};
+
+static const char *sahara_err_dmasrc[8] = {
+	"No error",
+	"AHB bus error",
+	"Internal IP bus error",
+	"Parity error",
+	"DMA crosses 256 byte boundary",
+	"DMA is busy",
+	"Reserved",
+	"DMA HW error"
+};
+
+static const char *sahara_cha_errsrc[12] = {
+	"Input buffer non-empty",
+	"Illegal address",
+	"Illegal mode",
+	"Illegal data size",
+	"Illegal key size",
+	"Write during processing",
+	"CTX read during processing",
+	"HW error",
+	"Input buffer disabled/underflow",
+	"Output buffer disabled/overflow",
+	"DES key parity error",
+	"Reserved"
+};
+
+static const char *sahara_cha_err[4] = { "No error", "SKHA", "MDHA", "RNG" };
+
+static void sahara_decode_error(struct sahara_dev *dev, unsigned int error)
+{
+	u8 source = SAHARA_ERRSTATUS_GET_SOURCE(error);
+	u16 chasrc = ffs(SAHARA_ERRSTATUS_GET_CHASRC(error));
+
+	dev_err(dev->device, "%s: Error Register = 0x%08x\n", __func__, error);
+
+	dev_err(dev->device, "	- %s.\n", sahara_err_src[source]);
+
+	if (source == SAHARA_ERRSOURCE_DMA) {
+		if (error & SAHARA_ERRSTATUS_DMA_DIR)
+			dev_err(dev->device, "		* DMA read.\n");
+		else
+			dev_err(dev->device, "		* DMA write.\n");
+
+		dev_err(dev->device, "		* %s.\n",
+		       sahara_err_dmasize[SAHARA_ERRSTATUS_GET_DMASZ(error)]);
+		dev_err(dev->device, "		* %s.\n",
+		       sahara_err_dmasrc[SAHARA_ERRSTATUS_GET_DMASRC(error)]);
+	} else if (source == SAHARA_ERRSOURCE_CHA) {
+		dev_err(dev->device, "		* %s.\n",
+			sahara_cha_errsrc[chasrc]);
+		dev_err(dev->device, "		* %s.\n",
+		       sahara_cha_err[SAHARA_ERRSTATUS_GET_CHAERR(error)]);
+	}
+	dev_err(dev->device, "\n");
+}
+
+static const char *sahara_state[4] = { "Idle", "Busy", "Error", "HW Fault" };
+
+static void sahara_decode_status(struct sahara_dev *dev, unsigned int status)
+{
+	u8 state;
+
+	if (!__is_defined(DEBUG))
+		return;
+
+	state = SAHARA_STATUS_GET_STATE(status);
+
+	dev_dbg(dev->device, "%s: Status Register = 0x%08x\n",
+		__func__, status);
+
+	dev_dbg(dev->device, "	- State = %d:\n", state);
+	if (state & SAHARA_STATE_COMP_FLAG)
+		dev_dbg(dev->device, "		* Descriptor completed. IRQ pending.\n");
+
+	dev_dbg(dev->device, "		* %s.\n",
+	       sahara_state[state & ~SAHARA_STATE_COMP_FLAG]);
+
+	if (status & SAHARA_STATUS_DAR_FULL)
+		dev_dbg(dev->device, "	- DAR Full.\n");
+	if (status & SAHARA_STATUS_ERROR)
+		dev_dbg(dev->device, "	- Error.\n");
+	if (status & SAHARA_STATUS_SECURE)
+		dev_dbg(dev->device, "	- Secure.\n");
+	if (status & SAHARA_STATUS_FAIL)
+		dev_dbg(dev->device, "	- Fail.\n");
+	if (status & SAHARA_STATUS_RNG_RESEED)
+		dev_dbg(dev->device, "	- RNG Reseed Request.\n");
+	if (status & SAHARA_STATUS_ACTIVE_RNG)
+		dev_dbg(dev->device, "	- RNG Active.\n");
+	if (status & SAHARA_STATUS_ACTIVE_MDHA)
+		dev_dbg(dev->device, "	- MDHA Active.\n");
+	if (status & SAHARA_STATUS_ACTIVE_SKHA)
+		dev_dbg(dev->device, "	- SKHA Active.\n");
+
+	if (status & SAHARA_STATUS_MODE_BATCH)
+		dev_dbg(dev->device, "	- Batch Mode.\n");
+	else if (status & SAHARA_STATUS_MODE_DEDICATED)
+		dev_dbg(dev->device, "	- Dedicated Mode.\n");
+	else if (status & SAHARA_STATUS_MODE_DEBUG)
+		dev_dbg(dev->device, "	- Debug Mode.\n");
+
+	dev_dbg(dev->device, "	- Internal state = 0x%02x\n",
+	       SAHARA_STATUS_GET_ISTATE(status));
+
+	dev_dbg(dev->device, "Current DAR: 0x%08x\n",
+		sahara_read(dev, SAHARA_REG_CDAR));
+	dev_dbg(dev->device, "Initial DAR: 0x%08x\n\n",
+		sahara_read(dev, SAHARA_REG_IDAR));
+}
+
+static void sahara_dump_descriptors(struct sahara_dev *dev)
+{
+	int i;
+
+	if (!__is_defined(DEBUG))
+		return;
+
+	for (i = 0; i < SAHARA_MAX_HW_DESC; i++) {
+		dev_dbg(dev->device, "Descriptor (%d) (%pad):\n",
+			i, &dev->hw_phys_desc[i]);
+		dev_dbg(dev->device, "\thdr = 0x%08x\n", dev->hw_desc[i]->hdr);
+		dev_dbg(dev->device, "\tlen1 = %u\n", dev->hw_desc[i]->len1);
+		dev_dbg(dev->device, "\tp1 = 0x%08x\n", dev->hw_desc[i]->p1);
+		dev_dbg(dev->device, "\tlen2 = %u\n", dev->hw_desc[i]->len2);
+		dev_dbg(dev->device, "\tp2 = 0x%08x\n", dev->hw_desc[i]->p2);
+		dev_dbg(dev->device, "\tnext = 0x%08x\n",
+			dev->hw_desc[i]->next);
+	}
+	dev_dbg(dev->device, "\n");
+}
+
+static void sahara_dump_links(struct sahara_dev *dev)
+{
+	int i;
+
+	if (!__is_defined(DEBUG))
+		return;
+
+	for (i = 0; i < SAHARA_MAX_HW_LINK; i++) {
+		dev_dbg(dev->device, "Link (%d) (%pad):\n",
+			i, &dev->hw_phys_link[i]);
+		dev_dbg(dev->device, "\tlen = %u\n", dev->hw_link[i]->len);
+		dev_dbg(dev->device, "\tp = 0x%08x\n", dev->hw_link[i]->p);
+		dev_dbg(dev->device, "\tnext = 0x%08x\n",
+			dev->hw_link[i]->next);
+	}
+	dev_dbg(dev->device, "\n");
+}
+
+static int sahara_hw_descriptor_create(struct sahara_dev *dev)
+{
+	struct sahara_ctx *ctx = dev->ctx;
+	struct scatterlist *sg;
+	int ret;
+	int i, j;
+	int idx = 0;
+	u32 len;
+
+	memcpy(dev->key_base, ctx->key, ctx->keylen);
+
+	if (dev->flags & FLAGS_CBC) {
+		dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
+		dev->hw_desc[idx]->p1 = dev->iv_phys_base;
+	} else {
+		dev->hw_desc[idx]->len1 = 0;
+		dev->hw_desc[idx]->p1 = 0;
+	}
+	dev->hw_desc[idx]->len2 = ctx->keylen;
+	dev->hw_desc[idx]->p2 = dev->key_phys_base;
+	dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
+	dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
+
+	idx++;
+
+
+	dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total);
+	if (dev->nb_in_sg < 0) {
+		dev_err(dev->device, "Invalid numbers of src SG.\n");
+		return dev->nb_in_sg;
+	}
+	dev->nb_out_sg = sg_nents_for_len(dev->out_sg, dev->total);
+	if (dev->nb_out_sg < 0) {
+		dev_err(dev->device, "Invalid numbers of dst SG.\n");
+		return dev->nb_out_sg;
+	}
+	if ((dev->nb_in_sg + dev->nb_out_sg) > SAHARA_MAX_HW_LINK) {
+		dev_err(dev->device, "not enough hw links (%d)\n",
+			dev->nb_in_sg + dev->nb_out_sg);
+		return -EINVAL;
+	}
+
+	ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+			 DMA_TO_DEVICE);
+	if (!ret) {
+		dev_err(dev->device, "couldn't map in sg\n");
+		return -EINVAL;
+	}
+
+	ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg,
+			 DMA_FROM_DEVICE);
+	if (!ret) {
+		dev_err(dev->device, "couldn't map out sg\n");
+		goto unmap_in;
+	}
+
+	/* Create input links */
+	dev->hw_desc[idx]->p1 = dev->hw_phys_link[0];
+	sg = dev->in_sg;
+	len = dev->total;
+	for (i = 0; i < dev->nb_in_sg; i++) {
+		dev->hw_link[i]->len = min(len, sg->length);
+		dev->hw_link[i]->p = sg->dma_address;
+		if (i == (dev->nb_in_sg - 1)) {
+			dev->hw_link[i]->next = 0;
+		} else {
+			len -= min(len, sg->length);
+			dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
+			sg = sg_next(sg);
+		}
+	}
+
+	/* Create output links */
+	dev->hw_desc[idx]->p2 = dev->hw_phys_link[i];
+	sg = dev->out_sg;
+	len = dev->total;
+	for (j = i; j < dev->nb_out_sg + i; j++) {
+		dev->hw_link[j]->len = min(len, sg->length);
+		dev->hw_link[j]->p = sg->dma_address;
+		if (j == (dev->nb_out_sg + i - 1)) {
+			dev->hw_link[j]->next = 0;
+		} else {
+			len -= min(len, sg->length);
+			dev->hw_link[j]->next = dev->hw_phys_link[j + 1];
+			sg = sg_next(sg);
+		}
+	}
+
+	/* Fill remaining fields of hw_desc[1] */
+	dev->hw_desc[idx]->hdr = sahara_aes_data_link_hdr(dev);
+	dev->hw_desc[idx]->len1 = dev->total;
+	dev->hw_desc[idx]->len2 = dev->total;
+	dev->hw_desc[idx]->next = 0;
+
+	sahara_dump_descriptors(dev);
+	sahara_dump_links(dev);
+
+	sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
+
+	return 0;
+
+unmap_in:
+	dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+		DMA_TO_DEVICE);
+
+	return -EINVAL;
+}
+
+static void sahara_aes_cbc_update_iv(struct skcipher_request *req)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
+	unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+
+	/* Update IV buffer to contain the last ciphertext block */
+	if (rctx->mode & FLAGS_ENCRYPT) {
+		sg_pcopy_to_buffer(req->dst, sg_nents(req->dst), req->iv,
+				   ivsize, req->cryptlen - ivsize);
+	} else {
+		memcpy(req->iv, rctx->iv_out, ivsize);
+	}
+}
+
+static int sahara_aes_process(struct skcipher_request *req)
+{
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct sahara_dev *dev = dev_ptr;
+	struct sahara_ctx *ctx;
+	struct sahara_aes_reqctx *rctx;
+	int ret;
+	unsigned long timeout;
+
+	/* Request is ready to be dispatched by the device */
+	dev_dbg(dev->device,
+		"dispatch request (nbytes=%d, src=%p, dst=%p)\n",
+		req->cryptlen, req->src, req->dst);
+
+	/* assign new request to device */
+	dev->total = req->cryptlen;
+	dev->in_sg = req->src;
+	dev->out_sg = req->dst;
+
+	rctx = skcipher_request_ctx(req);
+	ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	rctx->mode &= FLAGS_MODE_MASK;
+	dev->flags = (dev->flags & ~FLAGS_MODE_MASK) | rctx->mode;
+
+	if ((dev->flags & FLAGS_CBC) && req->iv) {
+		unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
+
+		memcpy(dev->iv_base, req->iv, ivsize);
+
+		if (!(dev->flags & FLAGS_ENCRYPT)) {
+			sg_pcopy_to_buffer(req->src, sg_nents(req->src),
+					   rctx->iv_out, ivsize,
+					   req->cryptlen - ivsize);
+		}
+	}
+
+	/* assign new context to device */
+	dev->ctx = ctx;
+
+	reinit_completion(&dev->dma_completion);
+
+	ret = sahara_hw_descriptor_create(dev);
+	if (ret)
+		return -EINVAL;
+
+	timeout = wait_for_completion_timeout(&dev->dma_completion,
+				msecs_to_jiffies(SAHARA_TIMEOUT_MS));
+
+	dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
+		DMA_FROM_DEVICE);
+	dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+		DMA_TO_DEVICE);
+
+	if (!timeout) {
+		dev_err(dev->device, "AES timeout\n");
+		return -ETIMEDOUT;
+	}
+
+	if ((dev->flags & FLAGS_CBC) && req->iv)
+		sahara_aes_cbc_update_iv(req);
+
+	return 0;
+}
+
+static int sahara_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+			     unsigned int keylen)
+{
+	struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	ctx->keylen = keylen;
+
+	/* SAHARA only supports 128bit keys */
+	if (keylen == AES_KEYSIZE_128) {
+		memcpy(ctx->key, key, keylen);
+		return 0;
+	}
+
+	if (keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
+		return -EINVAL;
+
+	/*
+	 * The requested key size is not supported by HW, do a fallback.
+	 */
+	crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
+	crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
+						 CRYPTO_TFM_REQ_MASK);
+	return crypto_skcipher_setkey(ctx->fallback, key, keylen);
+}
+
+static int sahara_aes_fallback(struct skcipher_request *req, unsigned long mode)
+{
+	struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
+	struct sahara_ctx *ctx = crypto_skcipher_ctx(
+		crypto_skcipher_reqtfm(req));
+
+	skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
+	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);
+
+	if (mode & FLAGS_ENCRYPT)
+		return crypto_skcipher_encrypt(&rctx->fallback_req);
+
+	return crypto_skcipher_decrypt(&rctx->fallback_req);
+}
+
+static int sahara_aes_crypt(struct skcipher_request *req, unsigned long mode)
+{
+	struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
+	struct sahara_ctx *ctx = crypto_skcipher_ctx(
+		crypto_skcipher_reqtfm(req));
+	struct sahara_dev *dev = dev_ptr;
+	int err = 0;
+
+	if (!req->cryptlen)
+		return 0;
+
+	if (unlikely(ctx->keylen != AES_KEYSIZE_128))
+		return sahara_aes_fallback(req, mode);
+
+	dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n",
+		req->cryptlen, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC));
+
+	if (!IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE)) {
+		dev_err(dev->device,
+			"request size is not exact amount of AES blocks\n");
+		return -EINVAL;
+	}
+
+	rctx->mode = mode;
+
+	spin_lock_bh(&dev->queue_spinlock);
+	err = crypto_enqueue_request(&dev->queue, &req->base);
+	spin_unlock_bh(&dev->queue_spinlock);
+
+	wake_up_process(dev->kthread);
+
+	return err;
+}
+
+static int sahara_aes_ecb_encrypt(struct skcipher_request *req)
+{
+	return sahara_aes_crypt(req, FLAGS_ENCRYPT);
+}
+
+static int sahara_aes_ecb_decrypt(struct skcipher_request *req)
+{
+	return sahara_aes_crypt(req, 0);
+}
+
+static int sahara_aes_cbc_encrypt(struct skcipher_request *req)
+{
+	return sahara_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
+}
+
+static int sahara_aes_cbc_decrypt(struct skcipher_request *req)
+{
+	return sahara_aes_crypt(req, FLAGS_CBC);
+}
+
+static int sahara_aes_init_tfm(struct crypto_skcipher *tfm)
+{
+	const char *name = crypto_tfm_alg_name(&tfm->base);
+	struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	ctx->fallback = crypto_alloc_skcipher(name, 0,
+					      CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(ctx->fallback)) {
+		pr_err("Error allocating fallback algo %s\n", name);
+		return PTR_ERR(ctx->fallback);
+	}
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct sahara_aes_reqctx) +
+					 crypto_skcipher_reqsize(ctx->fallback));
+
+	return 0;
+}
+
+static void sahara_aes_exit_tfm(struct crypto_skcipher *tfm)
+{
+	struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	crypto_free_skcipher(ctx->fallback);
+}
+
+static u32 sahara_sha_init_hdr(struct sahara_dev *dev,
+			      struct sahara_sha_reqctx *rctx)
+{
+	u32 hdr = 0;
+
+	hdr = rctx->mode;
+
+	if (rctx->first) {
+		hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH;
+		hdr |= SAHARA_HDR_MDHA_INIT;
+	} else {
+		hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY;
+	}
+
+	if (rctx->last)
+		hdr |= SAHARA_HDR_MDHA_PDATA;
+
+	if (hweight_long(hdr) % 2 == 0)
+		hdr |= SAHARA_HDR_PARITY_BIT;
+
+	return hdr;
+}
+
+static int sahara_sha_hw_links_create(struct sahara_dev *dev,
+				       struct sahara_sha_reqctx *rctx,
+				       int start)
+{
+	struct scatterlist *sg;
+	unsigned int len;
+	unsigned int i;
+	int ret;
+
+	dev->in_sg = rctx->in_sg;
+
+	dev->nb_in_sg = sg_nents_for_len(dev->in_sg, rctx->total);
+	if (dev->nb_in_sg < 0) {
+		dev_err(dev->device, "Invalid numbers of src SG.\n");
+		return dev->nb_in_sg;
+	}
+	if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) {
+		dev_err(dev->device, "not enough hw links (%d)\n",
+			dev->nb_in_sg + dev->nb_out_sg);
+		return -EINVAL;
+	}
+
+	sg = dev->in_sg;
+	ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE);
+	if (!ret)
+		return -EFAULT;
+
+	len = rctx->total;
+	for (i = start; i < dev->nb_in_sg + start; i++) {
+		dev->hw_link[i]->len = min(len, sg->length);
+		dev->hw_link[i]->p = sg->dma_address;
+		if (i == (dev->nb_in_sg + start - 1)) {
+			dev->hw_link[i]->next = 0;
+		} else {
+			len -= min(len, sg->length);
+			dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
+			sg = sg_next(sg);
+		}
+	}
+
+	return i;
+}
+
+static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev,
+						struct sahara_sha_reqctx *rctx,
+						struct ahash_request *req,
+						int index)
+{
+	unsigned result_len;
+	int i = index;
+
+	if (rctx->first)
+		/* Create initial descriptor: #8*/
+		dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
+	else
+		/* Create hash descriptor: #10. Must follow #6. */
+		dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH;
+
+	dev->hw_desc[index]->len1 = rctx->total;
+	if (dev->hw_desc[index]->len1 == 0) {
+		/* if len1 is 0, p1 must be 0, too */
+		dev->hw_desc[index]->p1 = 0;
+		rctx->sg_in_idx = 0;
+	} else {
+		/* Create input links */
+		dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
+		i = sahara_sha_hw_links_create(dev, rctx, index);
+
+		rctx->sg_in_idx = index;
+		if (i < 0)
+			return i;
+	}
+
+	dev->hw_desc[index]->p2 = dev->hw_phys_link[i];
+
+	/* Save the context for the next operation */
+	result_len = rctx->context_size;
+	dev->hw_link[i]->p = dev->context_phys_base;
+
+	dev->hw_link[i]->len = result_len;
+	dev->hw_desc[index]->len2 = result_len;
+
+	dev->hw_link[i]->next = 0;
+
+	return 0;
+}
+
+/*
+ * Load descriptor aka #6
+ *
+ * To load a previously saved context back to the MDHA unit
+ *
+ * p1: Saved Context
+ * p2: NULL
+ *
+ */
+static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
+						struct sahara_sha_reqctx *rctx,
+						struct ahash_request *req,
+						int index)
+{
+	dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
+
+	dev->hw_desc[index]->len1 = rctx->context_size;
+	dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
+	dev->hw_desc[index]->len2 = 0;
+	dev->hw_desc[index]->p2 = 0;
+
+	dev->hw_link[index]->len = rctx->context_size;
+	dev->hw_link[index]->p = dev->context_phys_base;
+	dev->hw_link[index]->next = 0;
+
+	return 0;
+}
+
+static int sahara_sha_prepare_request(struct ahash_request *req)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+	unsigned int hash_later;
+	unsigned int block_size;
+	unsigned int len;
+
+	block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
+
+	/* append bytes from previous operation */
+	len = rctx->buf_cnt + req->nbytes;
+
+	/* only the last transfer can be padded in hardware */
+	if (!rctx->last && (len < block_size)) {
+		/* to few data, save for next operation */
+		scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src,
+					 0, req->nbytes, 0);
+		rctx->buf_cnt += req->nbytes;
+
+		return 0;
+	}
+
+	/* add data from previous operation first */
+	if (rctx->buf_cnt)
+		memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt);
+
+	/* data must always be a multiple of block_size */
+	hash_later = rctx->last ? 0 : len & (block_size - 1);
+	if (hash_later) {
+		unsigned int offset = req->nbytes - hash_later;
+		/* Save remaining bytes for later use */
+		scatterwalk_map_and_copy(rctx->buf, req->src, offset,
+					hash_later, 0);
+	}
+
+	rctx->total = len - hash_later;
+	/* have data from previous operation and current */
+	if (rctx->buf_cnt && req->nbytes) {
+		sg_init_table(rctx->in_sg_chain, 2);
+		sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
+		sg_chain(rctx->in_sg_chain, 2, req->src);
+		rctx->in_sg = rctx->in_sg_chain;
+	/* only data from previous operation */
+	} else if (rctx->buf_cnt) {
+		rctx->in_sg = rctx->in_sg_chain;
+		sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
+	/* no data from previous operation */
+	} else {
+		rctx->in_sg = req->src;
+	}
+
+	/* on next call, we only have the remaining data in the buffer */
+	rctx->buf_cnt = hash_later;
+
+	return -EINPROGRESS;
+}
+
+static int sahara_sha_process(struct ahash_request *req)
+{
+	struct sahara_dev *dev = dev_ptr;
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+	int ret;
+	unsigned long timeout;
+
+	ret = sahara_sha_prepare_request(req);
+	if (!ret)
+		return ret;
+
+	if (rctx->first) {
+		ret = sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0);
+		if (ret)
+			return ret;
+
+		dev->hw_desc[0]->next = 0;
+		rctx->first = 0;
+	} else {
+		memcpy(dev->context_base, rctx->context, rctx->context_size);
+
+		sahara_sha_hw_context_descriptor_create(dev, rctx, req, 0);
+		dev->hw_desc[0]->next = dev->hw_phys_desc[1];
+		ret = sahara_sha_hw_data_descriptor_create(dev, rctx, req, 1);
+		if (ret)
+			return ret;
+
+		dev->hw_desc[1]->next = 0;
+	}
+
+	sahara_dump_descriptors(dev);
+	sahara_dump_links(dev);
+
+	reinit_completion(&dev->dma_completion);
+
+	sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
+
+	timeout = wait_for_completion_timeout(&dev->dma_completion,
+				msecs_to_jiffies(SAHARA_TIMEOUT_MS));
+
+	if (rctx->sg_in_idx)
+		dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
+			     DMA_TO_DEVICE);
+
+	if (!timeout) {
+		dev_err(dev->device, "SHA timeout\n");
+		return -ETIMEDOUT;
+	}
+
+	memcpy(rctx->context, dev->context_base, rctx->context_size);
+
+	if (req->result && rctx->last)
+		memcpy(req->result, rctx->context, rctx->digest_size);
+
+	return 0;
+}
+
+static int sahara_queue_manage(void *data)
+{
+	struct sahara_dev *dev = data;
+	struct crypto_async_request *async_req;
+	struct crypto_async_request *backlog;
+	int ret = 0;
+
+	do {
+		__set_current_state(TASK_INTERRUPTIBLE);
+
+		spin_lock_bh(&dev->queue_spinlock);
+		backlog = crypto_get_backlog(&dev->queue);
+		async_req = crypto_dequeue_request(&dev->queue);
+		spin_unlock_bh(&dev->queue_spinlock);
+
+		if (backlog)
+			crypto_request_complete(backlog, -EINPROGRESS);
+
+		if (async_req) {
+			if (crypto_tfm_alg_type(async_req->tfm) ==
+			    CRYPTO_ALG_TYPE_AHASH) {
+				struct ahash_request *req =
+					ahash_request_cast(async_req);
+
+				ret = sahara_sha_process(req);
+			} else {
+				struct skcipher_request *req =
+					skcipher_request_cast(async_req);
+
+				ret = sahara_aes_process(req);
+			}
+
+			crypto_request_complete(async_req, ret);
+
+			continue;
+		}
+
+		schedule();
+	} while (!kthread_should_stop());
+
+	return 0;
+}
+
+static int sahara_sha_enqueue(struct ahash_request *req, int last)
+{
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+	struct sahara_dev *dev = dev_ptr;
+	int ret;
+
+	if (!req->nbytes && !last)
+		return 0;
+
+	rctx->last = last;
+
+	if (!rctx->active) {
+		rctx->active = 1;
+		rctx->first = 1;
+	}
+
+	spin_lock_bh(&dev->queue_spinlock);
+	ret = crypto_enqueue_request(&dev->queue, &req->base);
+	spin_unlock_bh(&dev->queue_spinlock);
+
+	wake_up_process(dev->kthread);
+
+	return ret;
+}
+
+static int sahara_sha_init(struct ahash_request *req)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+	memset(rctx, 0, sizeof(*rctx));
+
+	switch (crypto_ahash_digestsize(tfm)) {
+	case SHA1_DIGEST_SIZE:
+		rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA1;
+		rctx->digest_size = SHA1_DIGEST_SIZE;
+		break;
+	case SHA256_DIGEST_SIZE:
+		rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA256;
+		rctx->digest_size = SHA256_DIGEST_SIZE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	rctx->context_size = rctx->digest_size + 4;
+	rctx->active = 0;
+
+	return 0;
+}
+
+static int sahara_sha_update(struct ahash_request *req)
+{
+	return sahara_sha_enqueue(req, 0);
+}
+
+static int sahara_sha_final(struct ahash_request *req)
+{
+	req->nbytes = 0;
+	return sahara_sha_enqueue(req, 1);
+}
+
+static int sahara_sha_finup(struct ahash_request *req)
+{
+	return sahara_sha_enqueue(req, 1);
+}
+
+static int sahara_sha_digest(struct ahash_request *req)
+{
+	sahara_sha_init(req);
+
+	return sahara_sha_finup(req);
+}
+
+static int sahara_sha_export(struct ahash_request *req, void *out)
+{
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+	memcpy(out, rctx, sizeof(struct sahara_sha_reqctx));
+
+	return 0;
+}
+
+static int sahara_sha_import(struct ahash_request *req, const void *in)
+{
+	struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
+
+	memcpy(rctx, in, sizeof(struct sahara_sha_reqctx));
+
+	return 0;
+}
+
+static int sahara_sha_cra_init(struct crypto_tfm *tfm)
+{
+	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+				 sizeof(struct sahara_sha_reqctx));
+
+	return 0;
+}
+
+static struct skcipher_alg aes_algs[] = {
+{
+	.base.cra_name		= "ecb(aes)",
+	.base.cra_driver_name	= "sahara-ecb-aes",
+	.base.cra_priority	= 300,
+	.base.cra_flags		= CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct sahara_ctx),
+	.base.cra_alignmask	= 0x0,
+	.base.cra_module	= THIS_MODULE,
+
+	.init			= sahara_aes_init_tfm,
+	.exit			= sahara_aes_exit_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE ,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.setkey			= sahara_aes_setkey,
+	.encrypt		= sahara_aes_ecb_encrypt,
+	.decrypt		= sahara_aes_ecb_decrypt,
+}, {
+	.base.cra_name		= "cbc(aes)",
+	.base.cra_driver_name	= "sahara-cbc-aes",
+	.base.cra_priority	= 300,
+	.base.cra_flags		= CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct sahara_ctx),
+	.base.cra_alignmask	= 0x0,
+	.base.cra_module	= THIS_MODULE,
+
+	.init			= sahara_aes_init_tfm,
+	.exit			= sahara_aes_exit_tfm,
+	.min_keysize		= AES_MIN_KEY_SIZE ,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.ivsize			= AES_BLOCK_SIZE,
+	.setkey			= sahara_aes_setkey,
+	.encrypt		= sahara_aes_cbc_encrypt,
+	.decrypt		= sahara_aes_cbc_decrypt,
+}
+};
+
+static struct ahash_alg sha_v3_algs[] = {
+{
+	.init		= sahara_sha_init,
+	.update		= sahara_sha_update,
+	.final		= sahara_sha_final,
+	.finup		= sahara_sha_finup,
+	.digest		= sahara_sha_digest,
+	.export		= sahara_sha_export,
+	.import		= sahara_sha_import,
+	.halg.digestsize	= SHA1_DIGEST_SIZE,
+	.halg.statesize         = sizeof(struct sahara_sha_reqctx),
+	.halg.base	= {
+		.cra_name		= "sha1",
+		.cra_driver_name	= "sahara-sha1",
+		.cra_priority		= 300,
+		.cra_flags		= CRYPTO_ALG_ASYNC |
+						CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize		= SHA1_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct sahara_ctx),
+		.cra_alignmask		= 0,
+		.cra_module		= THIS_MODULE,
+		.cra_init		= sahara_sha_cra_init,
+	}
+},
+};
+
+static struct ahash_alg sha_v4_algs[] = {
+{
+	.init		= sahara_sha_init,
+	.update		= sahara_sha_update,
+	.final		= sahara_sha_final,
+	.finup		= sahara_sha_finup,
+	.digest		= sahara_sha_digest,
+	.export		= sahara_sha_export,
+	.import		= sahara_sha_import,
+	.halg.digestsize	= SHA256_DIGEST_SIZE,
+	.halg.statesize         = sizeof(struct sahara_sha_reqctx),
+	.halg.base	= {
+		.cra_name		= "sha256",
+		.cra_driver_name	= "sahara-sha256",
+		.cra_priority		= 300,
+		.cra_flags		= CRYPTO_ALG_ASYNC |
+						CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize		= SHA256_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct sahara_ctx),
+		.cra_alignmask		= 0,
+		.cra_module		= THIS_MODULE,
+		.cra_init		= sahara_sha_cra_init,
+	}
+},
+};
+
+static irqreturn_t sahara_irq_handler(int irq, void *data)
+{
+	struct sahara_dev *dev = data;
+	unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS);
+	unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS);
+
+	sahara_write(dev, SAHARA_CMD_CLEAR_INT | SAHARA_CMD_CLEAR_ERR,
+		     SAHARA_REG_CMD);
+
+	sahara_decode_status(dev, stat);
+
+	if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_BUSY) {
+		return IRQ_NONE;
+	} else if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_COMPLETE) {
+		dev->error = 0;
+	} else {
+		sahara_decode_error(dev, err);
+		dev->error = -EINVAL;
+	}
+
+	complete(&dev->dma_completion);
+
+	return IRQ_HANDLED;
+}
+
+
+static int sahara_register_algs(struct sahara_dev *dev)
+{
+	int err;
+	unsigned int i, j, k, l;
+
+	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
+		err = crypto_register_skcipher(&aes_algs[i]);
+		if (err)
+			goto err_aes_algs;
+	}
+
+	for (k = 0; k < ARRAY_SIZE(sha_v3_algs); k++) {
+		err = crypto_register_ahash(&sha_v3_algs[k]);
+		if (err)
+			goto err_sha_v3_algs;
+	}
+
+	if (dev->version > SAHARA_VERSION_3)
+		for (l = 0; l < ARRAY_SIZE(sha_v4_algs); l++) {
+			err = crypto_register_ahash(&sha_v4_algs[l]);
+			if (err)
+				goto err_sha_v4_algs;
+		}
+
+	return 0;
+
+err_sha_v4_algs:
+	for (j = 0; j < l; j++)
+		crypto_unregister_ahash(&sha_v4_algs[j]);
+
+err_sha_v3_algs:
+	for (j = 0; j < k; j++)
+		crypto_unregister_ahash(&sha_v3_algs[j]);
+
+err_aes_algs:
+	for (j = 0; j < i; j++)
+		crypto_unregister_skcipher(&aes_algs[j]);
+
+	return err;
+}
+
+static void sahara_unregister_algs(struct sahara_dev *dev)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
+		crypto_unregister_skcipher(&aes_algs[i]);
+
+	for (i = 0; i < ARRAY_SIZE(sha_v3_algs); i++)
+		crypto_unregister_ahash(&sha_v3_algs[i]);
+
+	if (dev->version > SAHARA_VERSION_3)
+		for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++)
+			crypto_unregister_ahash(&sha_v4_algs[i]);
+}
+
+static const struct of_device_id sahara_dt_ids[] = {
+	{ .compatible = "fsl,imx53-sahara" },
+	{ .compatible = "fsl,imx27-sahara" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sahara_dt_ids);
+
+static int sahara_probe(struct platform_device *pdev)
+{
+	struct sahara_dev *dev;
+	u32 version;
+	int irq;
+	int err;
+	int i;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->device = &pdev->dev;
+	platform_set_drvdata(pdev, dev);
+
+	/* Get the base address */
+	dev->regs_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dev->regs_base))
+		return PTR_ERR(dev->regs_base);
+
+	/* Get the IRQ */
+	irq = platform_get_irq(pdev,  0);
+	if (irq < 0)
+		return irq;
+
+	err = devm_request_irq(&pdev->dev, irq, sahara_irq_handler,
+			       0, dev_name(&pdev->dev), dev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		return err;
+	}
+
+	/* clocks */
+	dev->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+	if (IS_ERR(dev->clk_ipg)) {
+		dev_err(&pdev->dev, "Could not get ipg clock\n");
+		return PTR_ERR(dev->clk_ipg);
+	}
+
+	dev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
+	if (IS_ERR(dev->clk_ahb)) {
+		dev_err(&pdev->dev, "Could not get ahb clock\n");
+		return PTR_ERR(dev->clk_ahb);
+	}
+
+	/* Allocate HW descriptors */
+	dev->hw_desc[0] = dmam_alloc_coherent(&pdev->dev,
+			SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc),
+			&dev->hw_phys_desc[0], GFP_KERNEL);
+	if (!dev->hw_desc[0]) {
+		dev_err(&pdev->dev, "Could not allocate hw descriptors\n");
+		return -ENOMEM;
+	}
+	dev->hw_desc[1] = dev->hw_desc[0] + 1;
+	dev->hw_phys_desc[1] = dev->hw_phys_desc[0] +
+				sizeof(struct sahara_hw_desc);
+
+	/* Allocate space for iv and key */
+	dev->key_base = dmam_alloc_coherent(&pdev->dev, 2 * AES_KEYSIZE_128,
+				&dev->key_phys_base, GFP_KERNEL);
+	if (!dev->key_base) {
+		dev_err(&pdev->dev, "Could not allocate memory for key\n");
+		return -ENOMEM;
+	}
+	dev->iv_base = dev->key_base + AES_KEYSIZE_128;
+	dev->iv_phys_base = dev->key_phys_base + AES_KEYSIZE_128;
+
+	/* Allocate space for context: largest digest + message length field */
+	dev->context_base = dmam_alloc_coherent(&pdev->dev,
+					SHA256_DIGEST_SIZE + 4,
+					&dev->context_phys_base, GFP_KERNEL);
+	if (!dev->context_base) {
+		dev_err(&pdev->dev, "Could not allocate memory for MDHA context\n");
+		return -ENOMEM;
+	}
+
+	/* Allocate space for HW links */
+	dev->hw_link[0] = dmam_alloc_coherent(&pdev->dev,
+			SAHARA_MAX_HW_LINK * sizeof(struct sahara_hw_link),
+			&dev->hw_phys_link[0], GFP_KERNEL);
+	if (!dev->hw_link[0]) {
+		dev_err(&pdev->dev, "Could not allocate hw links\n");
+		return -ENOMEM;
+	}
+	for (i = 1; i < SAHARA_MAX_HW_LINK; i++) {
+		dev->hw_phys_link[i] = dev->hw_phys_link[i - 1] +
+					sizeof(struct sahara_hw_link);
+		dev->hw_link[i] = dev->hw_link[i - 1] + 1;
+	}
+
+	crypto_init_queue(&dev->queue, SAHARA_QUEUE_LENGTH);
+
+	spin_lock_init(&dev->queue_spinlock);
+
+	dev_ptr = dev;
+
+	dev->kthread = kthread_run(sahara_queue_manage, dev, "sahara_crypto");
+	if (IS_ERR(dev->kthread)) {
+		return PTR_ERR(dev->kthread);
+	}
+
+	init_completion(&dev->dma_completion);
+
+	err = clk_prepare_enable(dev->clk_ipg);
+	if (err)
+		return err;
+	err = clk_prepare_enable(dev->clk_ahb);
+	if (err)
+		goto clk_ipg_disable;
+
+	version = sahara_read(dev, SAHARA_REG_VERSION);
+	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx27-sahara")) {
+		if (version != SAHARA_VERSION_3)
+			err = -ENODEV;
+	} else if (of_device_is_compatible(pdev->dev.of_node,
+			"fsl,imx53-sahara")) {
+		if (((version >> 8) & 0xff) != SAHARA_VERSION_4)
+			err = -ENODEV;
+		version = (version >> 8) & 0xff;
+	}
+	if (err == -ENODEV) {
+		dev_err(&pdev->dev, "SAHARA version %d not supported\n",
+				version);
+		goto err_algs;
+	}
+
+	dev->version = version;
+
+	sahara_write(dev, SAHARA_CMD_RESET | SAHARA_CMD_MODE_BATCH,
+		     SAHARA_REG_CMD);
+	sahara_write(dev, SAHARA_CONTROL_SET_THROTTLE(0) |
+			SAHARA_CONTROL_SET_MAXBURST(8) |
+			SAHARA_CONTROL_RNG_AUTORSD |
+			SAHARA_CONTROL_ENABLE_INT,
+			SAHARA_REG_CONTROL);
+
+	err = sahara_register_algs(dev);
+	if (err)
+		goto err_algs;
+
+	dev_info(&pdev->dev, "SAHARA version %d initialized\n", version);
+
+	return 0;
+
+err_algs:
+	kthread_stop(dev->kthread);
+	dev_ptr = NULL;
+	clk_disable_unprepare(dev->clk_ahb);
+clk_ipg_disable:
+	clk_disable_unprepare(dev->clk_ipg);
+
+	return err;
+}
+
+static int sahara_remove(struct platform_device *pdev)
+{
+	struct sahara_dev *dev = platform_get_drvdata(pdev);
+
+	kthread_stop(dev->kthread);
+
+	sahara_unregister_algs(dev);
+
+	clk_disable_unprepare(dev->clk_ipg);
+	clk_disable_unprepare(dev->clk_ahb);
+
+	dev_ptr = NULL;
+
+	return 0;
+}
+
+static struct platform_driver sahara_driver = {
+	.probe		= sahara_probe,
+	.remove		= sahara_remove,
+	.driver		= {
+		.name	= SAHARA_NAME,
+		.of_match_table = sahara_dt_ids,
+	},
+};
+
+module_platform_driver(sahara_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
+MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
+MODULE_DESCRIPTION("SAHARA2 HW crypto accelerator");