From: Kamil Konieczny <k.konieczny@partner.samsung.com>
Subject: [PATCH] crypto: s5p-sss: Add HASH support for Exynos
To: linux-crypto@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Vladimir Zapolskiy <vz@mleia.com>, linux-samsung-soc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Message-id: <51b3b386-22c0-7663-6f54-d166ebebd332@partner.samsung.com>
Date: Wed, 13 Sep 2017 14:44:32 +0200
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References: <CGME20170913124433eucas1p11ac46af1676151477000f8952b0ca654@eucas1p1.samsung.com>
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Add support for MD5, SHA1, SHA256 hash algorithms for Exynos HW.
It uses the crypto framework asynchronous hash api.
It is based on omap-sham.c driver.
S5P has some HW differencies and is not implemented.

Modifications in s5p-sss:

- Add hash supporting structures and functions.

- Modify irq handler to handle both aes and hash signals.

- Disable HASH in probe if Exynos PRNG is enabled.

- Add new copyright line and new author.

- Tested on Odroid-U3 with Exynos 4412 CPU, kernel 4.13-rc6
  with crypto run-time self test testmgr
  and with tcrypt module with: modprobe tcrypt sec=1 mode=N
  where N=402, 403, 404 (MD5, SHA1, SHA256).

Modifications in drivers/crypto/Kconfig:

- Select sw algorithms MD5, SHA1 and SHA256 in S5P
  as they are nedded for fallback.

Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
---
 drivers/crypto/Kconfig   |    6 +
 drivers/crypto/s5p-sss.c | 2062 +++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 1939 insertions(+), 129 deletions(-)

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index fe33c199fc1a..a8bc7e73c6bc 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -434,10 +434,16 @@ config CRYPTO_DEV_S5P
 	depends on HAS_IOMEM && HAS_DMA
 	select CRYPTO_AES
 	select CRYPTO_BLKCIPHER
+	select CRYPTO_SHA1
+	select CRYPTO_MD5
+	select CRYPTO_SHA256
 	help
 	  This option allows you to have support for S5P crypto acceleration.
 	  Select this to offload Samsung S5PV210 or S5PC110, Exynos from AES
 	  algorithms execution.
+	  Select this to offload Exynos from HASH MD5/SHA1/SHA256.
+	  HASH algorithms will be disabled in runtime if EXYNOS_RNG
+	  was enabled due to hw conflict.
 
 config CRYPTO_DEV_NX
 	bool "Support for IBM PowerPC Nest (NX) cryptographic acceleration"
diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index 7ac657f46d15..ed2739198508 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -1,18 +1,21 @@
 /*
  * Cryptographic API.
  *
- * Support for Samsung S5PV210 HW acceleration.
+ * Support for Samsung S5PV210 and Exynos HW acceleration.
  *
  * Copyright (C) 2011 NetUP Inc. All rights reserved.
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.
  *
+ * Hash part based on omap-sham.c driver.
  */
 
 #include <linux/clk.h>
 #include <linux/crypto.h>
+#include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
 #include <linux/errno.h>
@@ -30,28 +33,67 @@
 #include <crypto/algapi.h>
 #include <crypto/scatterwalk.h>
 
+#include <crypto/hash.h>
+#include <crypto/md5.h>
+#include <crypto/sha.h>
+#include <crypto/internal/hash.h>
+
 #define _SBF(s, v)                      ((v) << (s))
 
+#ifdef DEBUG
+
+static int flow_debug_logging;
+static int flow_debug_dump;
+
+/* from crypto/bcm/util.h */
+#define FLOW_LOG(...)				\
+	do {					\
+		if (flow_debug_logging) {	\
+			printk(__VA_ARGS__);	\
+		}				\
+	} while (0)
+#define FLOW_DUMP(msg, var, var_len)		\
+	do {					\
+		if (flow_debug_dump) {		\
+			print_hex_dump(KERN_ALERT, msg, DUMP_PREFIX_NONE, \
+					16, 1, var, var_len, false); \
+		}				\
+	} while (0)
+#else /* !DEBUG */
+
+#define FLOW_LOG(...)			do {} while (0)
+#define FLOW_DUMP(msg, var, var_len)	do {} while (0)
+
+#endif /* DEBUG */
+
 /* Feed control registers */
 #define SSS_REG_FCINTSTAT               0x0000
+#define SSS_FCINTSTAT_HPARTINT		BIT(7)
+#define SSS_FCINTSTAT_HDONEINT		BIT(5)
 #define SSS_FCINTSTAT_BRDMAINT          BIT(3)
 #define SSS_FCINTSTAT_BTDMAINT          BIT(2)
 #define SSS_FCINTSTAT_HRDMAINT          BIT(1)
 #define SSS_FCINTSTAT_PKDMAINT          BIT(0)
 
 #define SSS_REG_FCINTENSET              0x0004
+#define SSS_FCINTENSET_HPARTINTENSET	BIT(7)
+#define SSS_FCINTENSET_HDONEINTENSET	BIT(5)
 #define SSS_FCINTENSET_BRDMAINTENSET    BIT(3)
 #define SSS_FCINTENSET_BTDMAINTENSET    BIT(2)
 #define SSS_FCINTENSET_HRDMAINTENSET    BIT(1)
 #define SSS_FCINTENSET_PKDMAINTENSET    BIT(0)
 
 #define SSS_REG_FCINTENCLR              0x0008
+#define SSS_FCINTENCLR_HPARTINTENCLR	BIT(7)
+#define SSS_FCINTENCLR_HDONEINTENCLR	BIT(5)
 #define SSS_FCINTENCLR_BRDMAINTENCLR    BIT(3)
 #define SSS_FCINTENCLR_BTDMAINTENCLR    BIT(2)
 #define SSS_FCINTENCLR_HRDMAINTENCLR    BIT(1)
 #define SSS_FCINTENCLR_PKDMAINTENCLR    BIT(0)
 
 #define SSS_REG_FCINTPEND               0x000C
+#define SSS_FCINTPEND_HPARTINTP		BIT(7)
+#define SSS_FCINTPEND_HDONEINTP		BIT(5)
 #define SSS_FCINTPEND_BRDMAINTP         BIT(3)
 #define SSS_FCINTPEND_BTDMAINTP         BIT(2)
 #define SSS_FCINTPEND_HRDMAINTP         BIT(1)
@@ -72,6 +114,7 @@
 #define SSS_HASHIN_INDEPENDENT          _SBF(0, 0x00)
 #define SSS_HASHIN_CIPHER_INPUT         _SBF(0, 0x01)
 #define SSS_HASHIN_CIPHER_OUTPUT        _SBF(0, 0x02)
+#define SSS_HASHIN_MASK			_SBF(0, 0x03)
 
 #define SSS_REG_FCBRDMAS                0x0020
 #define SSS_REG_FCBRDMAL                0x0024
@@ -146,9 +189,119 @@
 #define AES_KEY_LEN         16
 #define CRYPTO_QUEUE_LEN    1
 
+/* HASH registers */
+#define SSS_REG_HASH_CTRL		0x00
+
+#define SSS_HASH_USER_IV_EN		BIT(5)
+#define SSS_HASH_INIT_BIT		BIT(4)
+#define SSS_HASH_ENGINE_SHA1		_SBF(1, 0x00)
+#define SSS_HASH_ENGINE_MD5		_SBF(1, 0x01)
+#define SSS_HASH_ENGINE_SHA256		_SBF(1, 0x02)
+
+#define SSS_HASH_ENGINE_MASK		_SBF(1, 0x03)
+
+#define SSS_REG_HASH_CTRL_PAUSE		0x04
+
+#define SSS_HASH_PAUSE			BIT(0)
+
+#define SSS_REG_HASH_CTRL_FIFO		0x08
+
+#define SSS_HASH_FIFO_MODE_DMA		BIT(0)
+#define SSS_HASH_FIFO_MODE_CPU          0
+
+#define SSS_REG_HASH_CTRL_SWAP		0x0c
+
+#define SSS_HASH_BYTESWAP_DI		BIT(3)
+#define SSS_HASH_BYTESWAP_DO		BIT(2)
+#define SSS_HASH_BYTESWAP_IV		BIT(1)
+#define SSS_HASH_BYTESWAP_KEY		BIT(0)
+
+#define SSS_REG_HASH_STATUS		0x10
+
+#define SSS_HASH_STATUS_MSG_DONE	BIT(6)
+#define SSS_HASH_STATUS_PARTIAL_DONE	BIT(4)
+#define SSS_HASH_STATUS_BUFFER_READY	BIT(0)
+
+#define SSS_REG_HASH_MSG_SIZE_LOW	0x20
+#define SSS_REG_HASH_MSG_SIZE_HIGH	0x24
+
+#define SSS_REG_HASH_PRE_MSG_SIZE_LOW	0x28
+#define SSS_REG_HASH_PRE_MSG_SIZE_HIGH	0x2c
+
+#define SSS_REG_TYPE			u32
+#define HASH_MAX_REG			16
+#define HASH_REG_SIZEOF			sizeof(SSS_REG_TYPE)
+
+#define HASH_BLOCK_SIZE			(HASH_MAX_REG*HASH_REG_SIZEOF)
+
+#define HASH_MD5_MAX_REG		(MD5_DIGEST_SIZE / HASH_REG_SIZEOF)
+#define HASH_SHA1_MAX_REG		(SHA1_DIGEST_SIZE / HASH_REG_SIZEOF)
+#define HASH_SHA256_MAX_REG		(SHA256_DIGEST_SIZE / HASH_REG_SIZEOF)
+
+#define SSS_REG_HASH_IV(s)		(0xB0 + ((s) << 2))
+#define SSS_REG_HASH_OUT(s)		(0x100 + ((s) << 2))
+
+#define DEFAULT_TIMEOUT_INTERVAL	HZ
+
+#define DEFAULT_AUTOSUSPEND_DELAY	1000
+
+/* HASH flags */
+#define HASH_FLAGS_BUSY		0
+#define HASH_FLAGS_FINAL	1
+#define HASH_FLAGS_DMA_ACTIVE	2
+#define HASH_FLAGS_OUTPUT_READY	3
+#define HASH_FLAGS_INIT		4
+#define HASH_FLAGS_DMA_READY	6
+
+#define HASH_FLAGS_SGS_COPIED	9
+#define HASH_FLAGS_SGS_ALLOCED	10
+/* HASH context flags */
+#define HASH_FLAGS_FINUP	16
+#define HASH_FLAGS_ERROR	17
+
+#define HASH_FLAGS_MODE_MD5	18
+#define HASH_FLAGS_MODE_SHA1	19
+#define HASH_FLAGS_MODE_SHA256	20
+
+#define HASH_FLAGS_MODE_MASK	(BIT(18) | BIT(19) | BIT(20))
+/* HASH op codes */
+#define HASH_OP_UPDATE		1
+#define HASH_OP_FINAL		2
+
+/* HASH HW constants */
+#define HASH_ALIGN_MASK		(HASH_BLOCK_SIZE-1)
+
+#define BUFLEN			HASH_BLOCK_SIZE
+
+#define SSS_DMA_ALIGN		16
+#define SSS_ALIGNED		__attribute__((aligned(SSS_DMA_ALIGN)))
+#define SSS_DMA_ALIGN_MASK	(SSS_DMA_ALIGN-1)
+
+/* HASH queue constant */
+#define SSS_HASH_QUEUE_LENGTH	10
+
+/**
+ * struct sss_hash_algs_info - platform specific SSS HASH algorithms
+ * @algs_list:	array of transformations (algorithms)
+ * @size:	size
+ * @registered:	counter used at probe/remove
+ *
+ * Specifies platform specific information about hash algorithms
+ * of SSS module.
+ */
+struct sss_hash_algs_info {
+	struct ahash_alg	*algs_list;
+	unsigned int		size;
+	unsigned int		registered;
+};
+
 /**
  * struct samsung_aes_variant - platform specific SSS driver data
  * @aes_offset: AES register offset from SSS module's base.
+ * @hash_offset: HASH register offset from SSS module's base.
+ *
+ * @hash_algs_info: HASH transformations provided by SS module
+ * @hash_algs_size: size of hash_algs_info
  *
  * Specifies platform specific configuration of SSS module.
  * Note: A structure for driver specific platform data is used for future
@@ -156,6 +309,10 @@
  */
 struct samsung_aes_variant {
 	unsigned int			aes_offset;
+	unsigned int			hash_offset;
+
+	struct sss_hash_algs_info	*hash_algs_info;
+	unsigned int			hash_algs_size;
 };
 
 struct s5p_aes_reqctx {
@@ -175,7 +332,7 @@ struct s5p_aes_ctx {
  * @dev:	Associated device
  * @clk:	Clock for accessing hardware
  * @ioaddr:	Mapped IO memory region
- * @aes_ioaddr:	Per-varian offset for AES block IO memory
+ * @aes_ioaddr:	Per-variant offset for AES block IO memory
  * @irq_fc:	Feed control interrupt line
  * @req:	Crypto request currently handled by the device
  * @ctx:	Configuration for currently handled crypto request
@@ -187,14 +344,28 @@ struct s5p_aes_ctx {
  *		with source data.
  * @sg_dst_cpy:	In case of unaligned access, copied scatter list
  *		with destination data.
- * @tasklet:	New request scheduling jib
+ * @tasklet:	New request scheduling job
  * @queue:	Crypto queue
  * @busy:	Indicates whether the device is currently handling some request
  *		thus it uses some of the fields from this state, like:
  *		req, ctx, sg_src/dst (and copies).  This essentially
  *		protects against concurrent access to these fields.
  * @lock:	Lock for protecting both access to device hardware registers
- *		and fields related to current request (including the busy field).
+ *		and fields related to current request (including the busy
+ *		field).
+ * @res:	Resources for hash.
+ * @io_hash_base: Per-variant offset for HASH block IO memory.
+ * @hash_lock:	Lock for protecting hash_req and other HASH variables.
+ * @hash_err:	Error flags for current HASH op.
+ * @hash_tasklet: New HASH request scheduling job.
+ * @xmit_buf:	Buffer for current HASH request transfer into SSS block.
+ * @hash_flags:	Flags for current HASH op.
+ * @hash_queue:	Async hash queue.
+ * @hash_req:	Current request sending to SSS HASH block.
+ * @hash_sg_iter: Scatterlist transferred through DMA into SSS HASH block.
+ * @hash_sg_cnt: Counter for hash_sg_iter.
+ *
+ * @pdata:	Per-variant algorithms for HASH ops.
  */
 struct s5p_aes_dev {
 	struct device			*dev;
@@ -215,16 +386,85 @@ struct s5p_aes_dev {
 	struct crypto_queue		queue;
 	bool				busy;
 	spinlock_t			lock;
+
+	struct resource			*res;
+	void __iomem			*io_hash_base;
+
+	spinlock_t			hash_lock;
+	int				hash_err;
+	struct tasklet_struct		hash_tasklet;
+	u8				xmit_buf[BUFLEN] SSS_ALIGNED;
+
+	unsigned long			hash_flags;
+	struct crypto_queue		hash_queue;
+	struct ahash_request		*hash_req;
+	struct scatterlist		*hash_sg_iter;
+	int				hash_sg_cnt;
+
+	struct samsung_aes_variant	*pdata;
 };
 
-static struct s5p_aes_dev *s5p_dev;
+/**
+ * struct s5p_hash_reqctx - HASH request context
+ * @dev:	Associated device
+ * @flags:	Bits for current HASH request
+ * @op:		Current request operation (OP_UPDATE or UP_FINAL)
+ * @digcnt:	Number of bytes processed by HW (without buffer[] ones)
+ * @digest:	Digest message or IV for partial result
+ * @bufcnt:	Number of bytes holded in buffer[]
+ * @buflen:	Max length of the input data buffer
+ * @nregs:	Number of HW registers for digest or IV read/write.
+ * @engine:	Flags for setting HASH SSS block.
+ * @sg:		sg for DMA transfer.
+ * @sg_len:	Length of sg for DMA transfer.
+ * @sgl[]:	sg for joining buffer and req->src scatterlist.
+ * @skip:	Skip offset in req->src for current op.
+ * @total:	Total number of bytes for current request.
+ * @buffer[]:	For byte(s) from end of req->src in UPDATE op.
+ */
+struct s5p_hash_reqctx {
+	struct s5p_aes_dev	*dd;
+	unsigned long		flags;
+	int			op;
+
+	u64			digcnt;
+	u8			digest[SHA256_DIGEST_SIZE] SSS_ALIGNED;
+	u32			bufcnt;
+	u32			buflen;
+
+	int			nregs; /* digest_size / sizeof(reg) */
+	u32			engine;
+
+	struct scatterlist	*sg;
+	int			sg_len;
+	struct scatterlist	sgl[2];
+	int			skip;	/* skip offset in req->src sg */
+	unsigned int		total;	/* total request */
+
+	u8			buffer[0] SSS_ALIGNED;
+};
+
+/**
+ * struct s5p_hash_ctx - HASH transformation context
+ * @dd:		Associated device
+ * @flags:	Bits for algorithm HASH.
+ * @fallback:	Software transformation for zero message or size < BUFLEN.
+ */
+struct s5p_hash_ctx {
+	struct s5p_aes_dev	*dd;
+	unsigned long		flags;
+	struct crypto_shash	*fallback;
+};
 
-static const struct samsung_aes_variant s5p_aes_data = {
+static struct samsung_aes_variant s5p_aes_data = {
 	.aes_offset	= 0x4000,
+	.hash_offset	= 0x6000,
+	.hash_algs_size	= 0,
 };
 
-static const struct samsung_aes_variant exynos_aes_data = {
-	.aes_offset	= 0x200,
+static struct samsung_aes_variant exynos_aes_data = {
+	.aes_offset		= 0x200,
+	.hash_offset		= 0x400,
 };
 
 static const struct of_device_id s5p_sss_dt_match[] = {
@@ -254,6 +494,8 @@ static inline struct samsung_aes_variant *find_s5p_sss_version
 			platform_get_device_id(pdev)->driver_data;
 }
 
+static struct s5p_aes_dev *s5p_dev;
+
 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
 {
 	SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
@@ -436,19 +678,89 @@ static int s5p_aes_rx(struct s5p_aes_dev *dev/*, bool *set_dma*/)
 	return ret;
 }
 
+static inline u32 s5p_hash_read(struct s5p_aes_dev *dd, u32 offset)
+{
+	return __raw_readl(dd->io_hash_base + offset);
+}
+
+static inline void s5p_hash_write(struct s5p_aes_dev *dd,
+				  u32 offset, u32 value)
+{
+	__raw_writel(value, dd->io_hash_base + offset);
+}
+
+static inline void s5p_hash_write_mask(struct s5p_aes_dev *dd, u32 address,
+				       u32 value, u32 mask)
+{
+	u32 val;
+
+	val = s5p_hash_read(dd, address);
+	val &= ~mask;
+	val |= value;
+	s5p_hash_write(dd, address, val);
+}
+
+/**
+ * s5p_set_dma_hashdata - start DMA with sg
+ * @dev:	device
+ * @sg:		scatterlist ready to DMA transmit
+ *
+ * decrement sg counter
+ * write addr and len into HASH regs
+ *
+ * DMA starts after writing length
+ */
+static void s5p_set_dma_hashdata(struct s5p_aes_dev *dev,
+				 struct scatterlist *sg)
+{
+	FLOW_LOG("sg_cnt=%d, sg=%p len=%d", dev->hash_sg_cnt, sg, sg->length);
+	dev->hash_sg_cnt--;
+	WARN_ON(dev->hash_sg_cnt < 0);
+	WARN_ON(sg_dma_len(sg) <= 0);
+	SSS_WRITE(dev, FCHRDMAS, sg_dma_address(sg));
+	SSS_WRITE(dev, FCHRDMAL, sg_dma_len(sg)); /* DMA starts */
+}
+
+/**
+ * s5p_hash_rx - get next hash_sg_iter
+ * @dev:	device
+ *
+ * Return:
+ * 2	if there is no more data,
+ * 1	if new receiving (input) data is ready and can be written to
+ *	device
+ */
+static int s5p_hash_rx(struct s5p_aes_dev *dev)
+{
+	int ret = 2;
+
+	FLOW_LOG("hash_rx sg_cnt=%d", dev->hash_sg_cnt);
+	if (dev->hash_sg_cnt > 0) {
+		dev->hash_sg_iter = sg_next(dev->hash_sg_iter);
+		ret = 1;
+	} else {
+		set_bit(HASH_FLAGS_DMA_READY, &dev->hash_flags);
+	}
+
+	return ret;
+}
+
 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 {
 	struct platform_device *pdev = dev_id;
 	struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
 	int err_dma_tx = 0;
 	int err_dma_rx = 0;
+	int err_dma_hx = 0;
 	bool tx_end = false;
+	bool hx_end = false;
 	unsigned long flags;
-	uint32_t status;
+	u32 status, st_bits;
 	int err;
 
-	spin_lock_irqsave(&dev->lock, flags);
+	FLOW_LOG("s5p_sss: irq\n");
 
+	spin_lock_irqsave(&dev->lock, flags);
 	/*
 	 * Handle rx or tx interrupt. If there is still data (scatterlist did not
 	 * reach end), then map next scatterlist entry.
@@ -456,6 +768,8 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 	 *
 	 * If there is no more data in tx scatter list, call s5p_aes_complete()
 	 * and schedule new tasklet.
+	 *
+	 * Handle hx interrupt. If there is still data map next entry.
 	 */
 	status = SSS_READ(dev, FCINTSTAT);
 	if (status & SSS_FCINTSTAT_BRDMAINT)
@@ -467,7 +781,33 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 		err_dma_tx = s5p_aes_tx(dev);
 	}
 
-	SSS_WRITE(dev, FCINTPEND, status);
+	if (status & SSS_FCINTSTAT_HRDMAINT)
+		err_dma_hx = s5p_hash_rx(dev);
+
+	st_bits = status & (SSS_FCINTSTAT_BRDMAINT | SSS_FCINTSTAT_BTDMAINT |
+				SSS_FCINTSTAT_HRDMAINT);
+	/* clear DMA bits */
+	SSS_WRITE(dev, FCINTPEND, st_bits);
+
+	/* clear HASH irq bits */
+	if (status & (SSS_FCINTSTAT_HDONEINT | SSS_FCINTSTAT_HPARTINT)) {
+		/* cannot have both HPART and HDONE */
+		if (status & SSS_FCINTSTAT_HPARTINT) {
+			FLOW_LOG("s5p_sss: irq HPART\n");
+			st_bits = SSS_HASH_STATUS_PARTIAL_DONE;
+		}
+
+		if (status & SSS_FCINTSTAT_HDONEINT) {
+			FLOW_LOG("s5p_sss: irq HDONE\n");
+			st_bits = SSS_HASH_STATUS_MSG_DONE;
+		}
+
+		set_bit(HASH_FLAGS_OUTPUT_READY, &dev->hash_flags);
+		s5p_hash_write(dev, SSS_REG_HASH_STATUS, st_bits);
+		hx_end = true;
+		/* when DONE or PART, do not handle HASH DMA */
+		err_dma_hx = 0;
+	}
 
 	if (err_dma_rx < 0) {
 		err = err_dma_rx;
@@ -478,9 +818,13 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 		goto error;
 	}
 
+	FLOW_LOG("s5p_sss: hx_end=%d err_dma_hx=%d\n", hx_end, err_dma_hx);
 	if (tx_end) {
 		s5p_sg_done(dev);
 
+		if (err_dma_hx == 1)
+			s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
+
 		spin_unlock_irqrestore(&dev->lock, flags);
 
 		s5p_aes_complete(dev, 0);
@@ -497,163 +841,1537 @@ static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
 			s5p_set_dma_outdata(dev, dev->sg_dst);
 		if (err_dma_rx == 1)
 			s5p_set_dma_indata(dev, dev->sg_src);
+		if (err_dma_hx == 1)
+			s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
 
 		spin_unlock_irqrestore(&dev->lock, flags);
 	}
 
-	return IRQ_HANDLED;
+	goto hash_irq_end;
 
 error:
 	s5p_sg_done(dev);
 	dev->busy = false;
+	if (err_dma_hx == 1)
+		s5p_set_dma_hashdata(dev, dev->hash_sg_iter);
+
 	spin_unlock_irqrestore(&dev->lock, flags);
 	s5p_aes_complete(dev, err);
 
+hash_irq_end:
+	/*
+	 * Note about else if:
+	 *   when hash_sg_iter reaches end and its UPDATE op,
+	 *   issue SSS_HASH_PAUSE and wait for HPART irq
+	 */
+	if (hx_end)
+		tasklet_schedule(&dev->hash_tasklet);
+	else if ((err_dma_hx == 2) &&
+		!test_bit(HASH_FLAGS_FINAL, &dev->hash_flags))
+		s5p_hash_write(dev, SSS_REG_HASH_CTRL_PAUSE,
+			       SSS_HASH_PAUSE);
+
 	return IRQ_HANDLED;
 }
 
-static void s5p_set_aes(struct s5p_aes_dev *dev,
-			uint8_t *key, uint8_t *iv, unsigned int keylen)
+/**
+ * s5p_hash_wait - wait for HASH status bit
+ * @dd:		secss device
+ * @offset:	offset for HASH register
+ * @bit:	status bit
+ */
+static inline int s5p_hash_wait(struct s5p_aes_dev *dd, u32 offset, u32 bit)
 {
-	void __iomem *keystart;
-
-	if (iv)
-		memcpy_toio(dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
+	unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
 
-	if (keylen == AES_KEYSIZE_256)
-		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(0);
-	else if (keylen == AES_KEYSIZE_192)
-		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(2);
-	else
-		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(4);
+	FLOW_LOG(__func__);
+	while (!(s5p_hash_read(dd, offset) & bit)) {
+		if (time_is_before_jiffies(timeout))
+			return -ETIMEDOUT;
+	}
 
-	memcpy_toio(keystart, key, keylen);
+	return 0;
 }
 
-static bool s5p_is_sg_aligned(struct scatterlist *sg)
+/**
+ * s5p_hash_read_msg - read message or IV from HW
+ * @req:	AHASH request
+ */
+static void s5p_hash_read_msg(struct ahash_request *req)
 {
-	while (sg) {
-		if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
-			return false;
-		sg = sg_next(sg);
-	}
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_aes_dev *dd = ctx->dd;
+	u32 *hash = (u32 *)ctx->digest;
+	int i;
 
-	return true;
+	FLOW_LOG(__func__);
+	for (i = 0; i < ctx->nregs; i++)
+		hash[i] = s5p_hash_read(dd, SSS_REG_HASH_OUT(i));
 }
 
-static int s5p_set_indata_start(struct s5p_aes_dev *dev,
-				struct ablkcipher_request *req)
+/**
+ * s5p_hash_write_ctx_iv - write IV for next partial/finup op.
+ * @dd:		device
+ * @ctx:	request context
+ */
+static void s5p_hash_write_ctx_iv(struct s5p_aes_dev *dd,
+				  struct s5p_hash_reqctx *ctx)
 {
-	struct scatterlist *sg;
-	int err;
-
-	dev->sg_src_cpy = NULL;
-	sg = req->src;
-	if (!s5p_is_sg_aligned(sg)) {
-		dev_dbg(dev->dev,
-			"At least one unaligned source scatter list, making a copy\n");
-		err = s5p_make_sg_cpy(dev, sg, &dev->sg_src_cpy);
-		if (err)
-			return err;
-
-		sg = dev->sg_src_cpy;
-	}
-
-	err = s5p_set_indata(dev, sg);
-	if (err) {
-		s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
-		return err;
-	}
+	u32 *hash = (u32 *)ctx->digest;
+	int i;
 
-	return 0;
+	FLOW_LOG(__func__);
+	for (i = 0; i < ctx->nregs; i++)
+		s5p_hash_write(dd, SSS_REG_HASH_IV(i), hash[i]);
 }
 
-static int s5p_set_outdata_start(struct s5p_aes_dev *dev,
-				struct ablkcipher_request *req)
+/**
+ * s5p_hash_write_iv - write IV for next partial/finup op.
+ * @req:	AHASH request
+ */
+static void s5p_hash_write_iv(struct ahash_request *req)
 {
-	struct scatterlist *sg;
-	int err;
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_aes_dev *dd = ctx->dd;
 
-	dev->sg_dst_cpy = NULL;
-	sg = req->dst;
-	if (!s5p_is_sg_aligned(sg)) {
-		dev_dbg(dev->dev,
-			"At least one unaligned dest scatter list, making a copy\n");
-		err = s5p_make_sg_cpy(dev, sg, &dev->sg_dst_cpy);
-		if (err)
-			return err;
+	s5p_hash_write_ctx_iv(dd, ctx);
+}
 
-		sg = dev->sg_dst_cpy;
-	}
+/**
+ * s5p_hash_copy_result - copy digest into req->result
+ * @req:	AHASH request
+ */
+static void s5p_hash_copy_result(struct ahash_request *req)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	int d = ctx->nregs;
 
-	err = s5p_set_outdata(dev, sg);
-	if (err) {
-		s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
-		return err;
-	}
+	FLOW_LOG(__func__);
+	if (!req->result)
+		return;
 
-	return 0;
+	FLOW_DUMP("digest msg: ", ctx->digest, d * HASH_REG_SIZEOF);
+	memcpy(req->result, (u8 *)ctx->digest, d * HASH_REG_SIZEOF);
 }
 
-static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
+/**
+ * s5p_hash_dma_flush - flush HASH DMA
+ * @dev:	secss device
+ */
+static void s5p_hash_dma_flush(struct s5p_aes_dev *dev)
 {
-	struct ablkcipher_request *req = dev->req;
-	uint32_t aes_control;
-	unsigned long flags;
-	int err;
-
-	aes_control = SSS_AES_KEY_CHANGE_MODE;
-	if (mode & FLAGS_AES_DECRYPT)
-		aes_control |= SSS_AES_MODE_DECRYPT;
+	FLOW_LOG("s5p_sss: %s\n", __func__);
+	SSS_WRITE(dev, FCHRDMAC, SSS_FCHRDMAC_FLUSH);
+}
 
-	if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
-		aes_control |= SSS_AES_CHAIN_MODE_CBC;
-	else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
-		aes_control |= SSS_AES_CHAIN_MODE_CTR;
+/**
+ * s5p_hash_dma_enable()
+ * @dev:	secss device
+ *
+ * enable DMA mode for HASH
+ */
+static void s5p_hash_dma_enable(struct s5p_aes_dev *dev)
+{
+	FLOW_LOG("s5p_sss: %s\n", __func__);
+	s5p_hash_write(dev, SSS_REG_HASH_CTRL_FIFO, SSS_HASH_FIFO_MODE_DMA);
+}
 
-	if (dev->ctx->keylen == AES_KEYSIZE_192)
-		aes_control |= SSS_AES_KEY_SIZE_192;
-	else if (dev->ctx->keylen == AES_KEYSIZE_256)
-		aes_control |= SSS_AES_KEY_SIZE_256;
+/**
+ * s5p_hash_irq_disable - disable irq HASH signals
+ * @dev:	secss device
+ * @flags:	bitfield with irq's to be disabled
+ *
+ * SSS_FCINTENCLR_HRDMAINTENCLR
+ * SSS_FCINTENCLR_HDONEINTENCLR
+ * SSS_FCINTENCLR_HPARTINTENCLR
+ */
+static void s5p_hash_irq_disable(struct s5p_aes_dev *dev, u32 flags)
+{
+	FLOW_LOG("s5p_sss: %s\n", __func__);
+	SSS_WRITE(dev, FCINTENCLR, flags);
+}
 
-	aes_control |= SSS_AES_FIFO_MODE;
+/**
+ * s5p_hash_irq_enable - enable irq signals
+ * @dev:	secss device
+ * @flags:	bitfield with irq's to be enabled
+ *
+ * SSS_FCINTENSET_HRDMAINTENSET
+ * SSS_FCINTENSET_HDONEINTENSET
+ * SSS_FCINTENSET_HPARTINTENSET
+ */
+static void s5p_hash_irq_enable(struct s5p_aes_dev *dev, int flags)
+{
+	FLOW_LOG("s5p_sss: %s\n", __func__);
+	SSS_WRITE(dev, FCINTENSET, flags);
+}
 
-	/* as a variant it is possible to use byte swapping on DMA side */
-	aes_control |= SSS_AES_BYTESWAP_DI
-		    |  SSS_AES_BYTESWAP_DO
-		    |  SSS_AES_BYTESWAP_IV
-		    |  SSS_AES_BYTESWAP_KEY
-		    |  SSS_AES_BYTESWAP_CNT;
+/**
+ * s5p_hash_set_flow()
+ * @dev:	secss device
+ * @hashflow:	HASH stream flow with/without crypto AES/DES
+ *
+ */
+static void s5p_hash_set_flow(struct s5p_aes_dev *dev, u32 hashflow)
+{
+	unsigned long flags;
+	u32 flow;
 
+	FLOW_LOG("s5p_sss: %s\n", __func__);
 	spin_lock_irqsave(&dev->lock, flags);
 
-	SSS_WRITE(dev, FCINTENCLR,
-		  SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
-	SSS_WRITE(dev, FCFIFOCTRL, 0x00);
+	flow = SSS_READ(dev, FCFIFOCTRL);
 
-	err = s5p_set_indata_start(dev, req);
-	if (err)
-		goto indata_error;
+	hashflow &= SSS_HASHIN_MASK;
+	flow &= ~SSS_HASHIN_MASK;
+	flow |= hashflow;
 
-	err = s5p_set_outdata_start(dev, req);
-	if (err)
-		goto outdata_error;
+	SSS_WRITE(dev, FCFIFOCTRL, hashflow);
 
-	SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
-	s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
+	spin_unlock_irqrestore(&dev->lock, flags);
+}
 
-	s5p_set_dma_indata(dev,  dev->sg_src);
-	s5p_set_dma_outdata(dev, dev->sg_dst);
+/**
+ * s5p_ahash_dma_init -
+ * @dev:	secss device
+ * @hashflow:	HASH stream flow with/without AES/DES
+ *
+ * flush HASH DMA and enable DMA,
+ * set HASH stream flow inside SecSS HW
+ * enable HASH irq's HRDMA, HDONE, HPART
+ */
+static void s5p_ahash_dma_init(struct s5p_aes_dev *dev, u32 hashflow)
+{
+	FLOW_LOG("s5p_sss: %s\n", __func__);
+	s5p_hash_irq_disable(dev, SSS_FCINTENCLR_HRDMAINTENCLR |
+			     SSS_FCINTENCLR_HDONEINTENCLR |
+			     SSS_FCINTENCLR_HPARTINTENCLR);
+	s5p_hash_dma_flush(dev);
 
-	SSS_WRITE(dev, FCINTENSET,
-		  SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
+/*	SSS_WRITE(dev, FCHRDMAC, SSS_FCHRDMAC_BYTESWAP); swap on */
 
-	spin_unlock_irqrestore(&dev->lock, flags);
+	s5p_hash_dma_enable(dev);
+	s5p_hash_set_flow(dev, hashflow);
 
-	return;
+	s5p_hash_irq_enable(dev, SSS_FCINTENSET_HRDMAINTENSET |
+			    SSS_FCINTENSET_HDONEINTENSET |
+			    SSS_FCINTENSET_HPARTINTENSET);
+}
 
-outdata_error:
-	s5p_unset_indata(dev);
+/**
+ * s5p_hash_hw_init -
+ * @dev:	secss device
+ */
+static int s5p_hash_hw_init(struct s5p_aes_dev *dev)
+{
+	set_bit(HASH_FLAGS_INIT, &dev->hash_flags);
+	s5p_ahash_dma_init(dev, SSS_HASHIN_INDEPENDENT);
+
+	return 0;
+}
+
+/**
+ * s5p_hash_write_ctrl -
+ * @dd:		secss device
+ * @length:	length for request
+ * @final:	0=not final
+ *
+ * Prepare SSS HASH block for processing bytes in DMA mode.
+ * If it is called after previous updates, fill up IV words.
+ * For final, calculate and set lengths for SSS HASH so it can
+ * finalize hash.
+ * For partial, set SSS HASH length as 2^63 so it will be never
+ * reached and set to zero prelow and prehigh.
+ *
+ * This function do not start DMA transfer.
+ */
+static void s5p_hash_write_ctrl(struct s5p_aes_dev *dd, size_t length,
+				int final)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
+	u32 configflags, swapflags;
+	u32 prelow, prehigh, low, high;
+	u64 tmplen;
+
+	FLOW_LOG("s5p_sss: %s engine: 0x%x digcnt=%lld\n", __func__,
+		 ctx->engine, ctx->digcnt);
+	configflags = ctx->engine | SSS_HASH_INIT_BIT;
+
+	if (likely(ctx->digcnt)) {
+		s5p_hash_write_ctx_iv(dd, ctx);
+		configflags |= SSS_HASH_USER_IV_EN;
+	}
+
+	if (final) {
+		/* number of bytes for last part */
+		low = length; high = 0;
+		/* total number of bits prev hashed */
+		tmplen = ctx->digcnt * 8;
+		prelow = (u32)tmplen;
+		prehigh = (u32)(tmplen >> 32);
+		FLOW_LOG("s5p_sss: %s final, length=%d tmplen=%llx\n", __func__,
+			low, tmplen);
+	} else {
+		FLOW_LOG("s5p_sss: %s partial\n", __func__);
+		prelow = 0; prehigh = 0;
+		low = 0; high = BIT(31);
+	}
+
+	swapflags = SSS_HASH_BYTESWAP_DI | SSS_HASH_BYTESWAP_DO |
+		    SSS_HASH_BYTESWAP_IV | SSS_HASH_BYTESWAP_KEY;
+
+	s5p_hash_write(dd, SSS_REG_HASH_MSG_SIZE_LOW, low);
+	s5p_hash_write(dd, SSS_REG_HASH_MSG_SIZE_HIGH, high);
+	s5p_hash_write(dd, SSS_REG_HASH_PRE_MSG_SIZE_LOW, prelow);
+	s5p_hash_write(dd, SSS_REG_HASH_PRE_MSG_SIZE_HIGH, prehigh);
+
+	s5p_hash_write(dd, SSS_REG_HASH_CTRL_SWAP, swapflags);
+	s5p_hash_write(dd, SSS_REG_HASH_CTRL, configflags);
+}
+
+/**
+ * s5p_hash_xmit_dma - start DMA hash processing
+ * @dd:		secss device
+ * @length:	length for request
+ * @final:	0=not final
+ *
+ * Map ctx->sg into DMA_TO_DEVICE,
+ * remember sg and cnt in device dd->hash_sg_iter, dd->hash_sg_cnt
+ * so it can be used in loop inside irq handler.
+ * Update ctx->digcnt, need this to keep number of processed bytes
+ * for last final/finup request.
+ * Set dma address and length, this starts DMA,
+ * return with -EINPROGRESS.
+ * HW HASH block will issue signal for irq handler.
+ */
+static int s5p_hash_xmit_dma(struct s5p_aes_dev *dd, size_t length,
+			      int final)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
+	int cnt;
+
+	dev_dbg(dd->dev, "xmit_dma: digcnt: %lld, length: %d, final: %d\n",
+						ctx->digcnt, length, final);
+
+	cnt = dma_map_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
+	if (!cnt) {
+		dev_err(dd->dev, "dma_map_sg error\n");
+		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
+		return -EINVAL;
+	}
+
+	FLOW_LOG("xmit_dma");
+	set_bit(HASH_FLAGS_DMA_ACTIVE, &dd->hash_flags);
+
+	dd->hash_sg_iter = ctx->sg;
+	dd->hash_sg_cnt = cnt;
+	FLOW_LOG("xmit_dma cnt=%d final=%d len=%d", cnt, final, length);
+
+	s5p_hash_write_ctrl(dd, length, final);
+
+	/* update digcnt in request */
+	ctx->digcnt += length;
+	ctx->total -= length;
+
+	/* catch last interrupt */
+	if (final)
+		set_bit(HASH_FLAGS_FINAL, &dd->hash_flags);
+
+	s5p_set_dma_hashdata(dd, dd->hash_sg_iter); /* DMA starts */
+
+	return -EINPROGRESS;
+}
+
+/**
+ * s5p_hash_copy_sgs -
+ * @ctx:	request context
+ * @sg:		source scatterlist request
+ * @bs:		block size
+ * @new_len:	number of bytes to process from sg
+ *
+ * Allocate new buffer, copy data for HASH into it.
+ * If there was xmit_buf filled, copy it first, then
+ * copy data from sg into it.
+ * Prepare one sgl[0] with allocated buffer.
+ *
+ * Set ctx->sg to sgl[0].
+ * Set flag so we can free it after irq ends processing.
+ */
+static int s5p_hash_copy_sgs(struct s5p_hash_reqctx *ctx,
+			     struct scatterlist *sg, int bs, int new_len)
+{
+	int pages;
+	void *buf;
+	int len;
+
+	FLOW_LOG("copy_sgs new_len=%d", new_len);
+	len = new_len + ctx->bufcnt;
+
+	FLOW_LOG("copy_sgs len=%d", len);
+	pages = get_order(len); /* ctx->total); */
+
+	buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
+	if (!buf) {
+		dev_err(ctx->dd->dev, "alloc pages for unaligned case.\n");
+		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
+		return -ENOMEM;
+	}
+
+	if (ctx->bufcnt)
+		memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
+
+	scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->skip,
+				 new_len, 0);
+	sg_init_table(ctx->sgl, 1);
+	sg_set_buf(ctx->sgl, buf, len);
+	ctx->sg = ctx->sgl;
+	ctx->sg_len = 1;
+	ctx->bufcnt = 0;
+	ctx->skip = 0;
+	set_bit(HASH_FLAGS_SGS_COPIED, &ctx->dd->hash_flags);
+
+	return 0;
+}
+
+/**
+ * s5p_hash_copy_sg_lists -
+ * @rctx:	request context
+ * @sg:		source scatterlist request
+ * @bs:		block size
+ * @new_len:	number of bytes to process from sg
+ *
+ * Allocate new scatterlist table, copy data for HASH into it.
+ * If there was xmit_buf filled, prepare it first, then
+ * copy page, length and offset from source sg into it,
+ * adjusting begin and/or end for skip offset and hash_later value.
+ *
+ * Resulting sg table will be assigned to ctx->sg.
+ * Set flag so we can free it after irq ends processing.
+ */
+static int s5p_hash_copy_sg_lists(struct s5p_hash_reqctx *ctx,
+				  struct scatterlist *sg, int bs, int new_len)
+{
+	int n = sg_nents(sg);
+	struct scatterlist *tmp;
+	int offset = ctx->skip;
+
+	FLOW_LOG("copy_sg_lists n=%d", n);
+	if (ctx->bufcnt)
+		n++;
+
+	FLOW_LOG("copy_sg_lists n=%d, alloc struct sg", n);
+	ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL);
+	if (!ctx->sg) {
+		dev_err(ctx->dd->dev, "alloc sg for unaligned case.\n");
+		set_bit(HASH_FLAGS_ERROR, &ctx->flags);
+		return -ENOMEM;
+	}
+
+	sg_init_table(ctx->sg, n);
+
+	tmp = ctx->sg;
+
+	ctx->sg_len = 0;
+
+	if (ctx->bufcnt) {
+		sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt);
+		tmp = sg_next(tmp);
+		ctx->sg_len++;
+	}
+
+	while (sg && new_len) {
+		int len = sg->length - offset;
+
+		if (offset) {
+			offset -= sg->length;
+			if (offset < 0)
+				offset = 0;
+		}
+
+		if (new_len < len)
+			len = new_len;
+
+		if (len > 0) {
+			new_len -= len;
+			sg_set_page(tmp, sg_page(sg), len, sg->offset);
+			if (new_len <= 0)
+				sg_mark_end(tmp);
+			tmp = sg_next(tmp);
+			ctx->sg_len++;
+		}
+
+		sg = sg_next(sg);
+	}
+
+	set_bit(HASH_FLAGS_SGS_ALLOCED, &ctx->dd->hash_flags);
+
+	ctx->bufcnt = 0;
+
+	return 0;
+}
+
+/**
+ * s5p_hash_prepare_sgs -
+ * @sg:		source scatterlist request
+ * @nbytes:	number of bytes to process from sg
+ * @bs:		block size
+ * @final:	final flag
+ * @rctx:	request context
+ *
+ * Check two conditions: (1) if buffers in sg have len aligned data,
+ * and (2) sg table have good aligned elements (list_ok)
+ * If one of this checks fails, then either
+ * (1) allocates new buffer for data with s5p_hash_copy_sgs,
+ * copy data into this buffer and prepare request in sgl, or
+ * (2) allocates new sg table and prepare sg elements
+ *
+ * For digest or finup all conditions can be good, and we may not need
+ * any fixes.
+ */
+static int s5p_hash_prepare_sgs(struct scatterlist *sg,
+				int nbytes, int bs, bool final,
+				struct s5p_hash_reqctx *rctx)
+{
+	int n = 0;
+	bool aligned = true;
+	bool list_ok = true;
+	struct scatterlist *sg_tmp = sg;
+	int offset = rctx->skip;
+	int new_len;
+
+	FLOW_LOG("prepare_sgs nbytes=%d bs=%d, final=%d", nbytes, bs, final);
+	if (!sg || !sg->length || !nbytes)
+		return 0;
+
+	new_len = nbytes;
+
+	if (offset)
+		list_ok = false;
+
+	if (!final)
+		list_ok = false;
+
+	while (nbytes > 0 && sg_tmp) {
+		n++;
+
+		if (offset < sg_tmp->length) {
+#if 0
+			if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
+				aligned = false;
+				break;
+			}
+#endif
+			if (!IS_ALIGNED(sg_tmp->length - offset, bs)) {
+				aligned = false;
+				break;
+			}
+		}
+
+		if (!sg_tmp->length) {
+			aligned = false;
+			break;
+		}
+
+		if (offset) {
+			offset -= sg_tmp->length;
+			if (offset < 0) {
+				nbytes += offset;
+				offset = 0;
+			}
+		} else {
+			nbytes -= sg_tmp->length;
+		}
+
+		sg_tmp = sg_next(sg_tmp);
+
+		if (nbytes < 0) { /* when hash_later is > 0 */
+			list_ok = false;
+			break;
+		}
+	}
+
+	if (!aligned)
+		return s5p_hash_copy_sgs(rctx, sg, bs, new_len);
+	else if (!list_ok)
+		return s5p_hash_copy_sg_lists(rctx, sg, bs, new_len);
+
+	/* have aligned data from previous operation and/or current
+	 * Note: will enter here only if (digest or finup) and aligned
+	 */
+	if (rctx->bufcnt) {
+		FLOW_LOG("prepare_sgs xmit_buf chained with sg sg_len=%d", n+1);
+		rctx->sg_len = n;
+		sg_init_table(rctx->sgl, 2);
+		sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt);
+		sg_chain(rctx->sgl, 2, sg);
+		rctx->sg = rctx->sgl;
+		rctx->sg_len++;
+	} else {
+		FLOW_LOG("prepare_sgs no xmit_buf, original sg sg_len=%d", n);
+		rctx->sg = sg;
+		rctx->sg_len = n;
+	}
+
+	return 0;
+}
+
+/**
+ * s5p_hash_prepare_request -
+ * @req:	AHASH request
+ * @update:	true if UPDATE op
+ *
+ * Note 1: we can have update flag _and_ final flag at the same time.
+ * Note 2: we enter here when digcnt > BUFLEN (=HASH_BLOCK_SIZE) or
+ *	   either req->nbytes or ctx->bufcnt + req->nbytes is > BUFLEN or
+ *	   we have final op
+ */
+static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
+{
+	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
+	int bs;
+	int ret;
+	int nbytes;
+	bool final = rctx->flags & BIT(HASH_FLAGS_FINUP);
+	int xmit_len, hash_later;
+
+	FLOW_LOG("prepare_req update=%d final=%d", update, final);
+	if (!req)
+		return 0;
+
+	bs = BUFLEN;
+
+	if (update)
+		nbytes = req->nbytes;
+	else
+		nbytes = 0;
+
+	rctx->total = nbytes + rctx->bufcnt;
+
+	FLOW_LOG("prepare_req total=%d", rctx->total);
+	if (!rctx->total)
+		return 0;
+
+	FLOW_LOG("prepare_req nbytes=%d bufcnt=%d", nbytes, rctx->bufcnt);
+	if (nbytes && (!IS_ALIGNED(rctx->bufcnt, BUFLEN))) {
+		/* bytes left from previous request, so fill up to BUFLEN */
+		int len = BUFLEN - rctx->bufcnt % BUFLEN;
+
+		FLOW_LOG("prepare_req fillup buffer, needed len=%d", len);
+		if (len > nbytes)
+			len = nbytes;
+		FLOW_LOG("prepare_req fillup, len=%d", len);
+		scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src,
+					 0, len, 0);
+		rctx->bufcnt += len;
+		nbytes -= len;
+		rctx->skip = len;
+		FLOW_LOG("prepare_req nbytes=%d bufcnt=%d skip=%d",
+			 nbytes, rctx->bufcnt, rctx->skip);
+	} else {
+		rctx->skip = 0;
+		FLOW_LOG("prepare_req skip=%d", rctx->skip);
+	}
+
+	if (rctx->bufcnt)
+		memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt);
+
+	xmit_len = rctx->total;
+	if (final) {
+		hash_later = 0;
+		FLOW_LOG("prepare_req final, zero hash_later");
+	} else {
+		if (IS_ALIGNED(xmit_len, bs))
+			xmit_len -= bs;
+		else
+			xmit_len -= xmit_len & (bs - 1);
+
+		hash_later = rctx->total - xmit_len;
+		WARN_ON(req->nbytes == 0);
+		WARN_ON(hash_later <= 0);
+		/* == if bufcnt was BUFLEN */
+		WARN_ON(req->nbytes < hash_later);
+		WARN_ON(rctx->skip > (req->nbytes - hash_later));
+		/* copy hash_later bytes from end of req->src */
+		/* previous bytes are in xmit_buf, so no overwrite */
+		FLOW_LOG("prepare_req copy tail to buffer, off=%d, count=%d",
+			 req->nbytes - hash_later, hash_later);
+		scatterwalk_map_and_copy(rctx->buffer, req->src,
+					 req->nbytes - hash_later,
+					 hash_later, 0);
+	}
+
+	WARN_ON(hash_later < 0);
+	WARN_ON(nbytes < hash_later);
+
+	if (xmit_len > bs) {
+		FLOW_LOG("prepare_req xmit_len > bs %d %d", xmit_len, bs);
+		WARN_ON(nbytes <= hash_later);
+		ret = s5p_hash_prepare_sgs(req->src, nbytes - hash_later, bs,
+					   final, rctx);
+		if (ret)
+			return ret;
+	} else {
+		/* have buffered data only */
+		FLOW_LOG("prepare_req data xmit_len=%d, bufcnt=%d",
+			 xmit_len, rctx->bufcnt);
+		if (unlikely(!rctx->bufcnt)) {
+			/* first update didn't fill up buffer */
+			WARN_ON(xmit_len != BUFLEN);
+			scatterwalk_map_and_copy(rctx->dd->xmit_buf, req->src,
+				0, xmit_len, 0);
+		}
+
+		sg_init_table(rctx->sgl, 1);
+		sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, xmit_len);
+
+		rctx->sg = rctx->sgl;
+		rctx->sg_len = 1;
+	}
+
+	FLOW_LOG("prepare_req hash_later=%d", hash_later);
+	rctx->bufcnt = hash_later;
+	if (!final)
+		rctx->total = xmit_len;
+
+	return 0;
+}
+
+/**
+ * s5p_hash_update_dma_stop()
+ * @dd:		secss device
+ *
+ * Unmap scatterlist ctx->sg.
+ */
+static int s5p_hash_update_dma_stop(struct s5p_aes_dev *dd)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(dd->hash_req);
+
+	dma_unmap_sg(dd->dev, ctx->sg, ctx->sg_len, DMA_TO_DEVICE);
+
+	clear_bit(HASH_FLAGS_DMA_ACTIVE, &dd->hash_flags);
+
+	return 0;
+}
+
+/**
+ * s5p_hash_update_req - process AHASH request
+ * @dd:		device s5p_aes_dev
+ *
+ * Processes the input data from AHASH request using DMA
+ *
+ * Current request should have ctx->sg prepared before.
+ *
+ * Returns: see s5p_hash_final below.
+ */
+static int s5p_hash_update_req(struct s5p_aes_dev *dd)
+{
+	struct ahash_request *req = dd->hash_req;
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	int err;
+	bool final = ctx->flags & BIT(HASH_FLAGS_FINUP);
+
+	dev_dbg(dd->dev, "update_req: total: %u, digcnt: %lld, finup: %d\n",
+		 ctx->total, ctx->digcnt, final);
+
+	err = s5p_hash_xmit_dma(dd, ctx->total, final);
+
+	/* wait for dma completion before can take more data */
+	dev_dbg(dd->dev, "update: err: %d, digcnt: %lld\n", err, ctx->digcnt);
+
+	return err;
+}
+
+/**
+ * s5p_hash_final_req - process the final AHASH request
+ * @dd:		device s5p_aes_dev
+ *
+ * Processes the input data from the last AHASH request
+ * using . Resets the buffer counter (ctx->bufcnt)
+ *
+ * Returns: see s5p_hash_final below.
+ */
+static int s5p_hash_final_req(struct s5p_aes_dev *dd)
+{
+	struct ahash_request *req = dd->hash_req;
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	int err = 0;
+
+	err = s5p_hash_xmit_dma(dd, ctx->total, 1);
+	ctx->bufcnt = 0;
+	dev_dbg(dd->dev, "final_req: err: %d\n", err);
+
+	return err;
+}
+
+/**
+ * s5p_hash_finish - copy calculated digest to crypto layer
+ * @req:	AHASH request
+ *
+ * Copies the calculated hash value to the buffer provided
+ * by req->result
+ *
+ * Returns 0 on success and negative values on error.
+ */
+static int s5p_hash_finish(struct ahash_request *req)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_aes_dev *dd = ctx->dd;
+	int err = 0;
+
+	if (ctx->digcnt)
+		s5p_hash_copy_result(req);
+
+	dev_dbg(dd->dev, "digcnt: %lld, bufcnt: %d\n", ctx->digcnt,
+		ctx->bufcnt);
+
+	return err;
+}
+
+/**
+ * s5p_hash_finish_req - finish request
+ * @req:	AHASH request
+ * @err:	error
+ *
+ * Clear flags, free memory,
+ * if FINAL then read output into ctx->digest,
+ * call completetion
+ */
+static void s5p_hash_finish_req(struct ahash_request *req, int err)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_aes_dev *dd = ctx->dd;
+
+	FLOW_LOG("s5p_sss: hash_finish_req\n");
+
+	if (test_bit(HASH_FLAGS_SGS_COPIED, &dd->hash_flags))
+		free_pages((unsigned long)sg_virt(ctx->sg),
+			   get_order(ctx->sg->length));
+
+	if (test_bit(HASH_FLAGS_SGS_ALLOCED, &dd->hash_flags))
+		kfree(ctx->sg);
+
+	ctx->sg = NULL;
+
+	dd->hash_flags &= ~(BIT(HASH_FLAGS_SGS_ALLOCED) |
+			    BIT(HASH_FLAGS_SGS_COPIED));
+
+	if (!err && !test_bit(HASH_FLAGS_ERROR, &ctx->flags)) {
+		FLOW_LOG("s5p_sss: hash__finish_req read msg\n");
+		s5p_hash_read_msg(req);
+		if (test_bit(HASH_FLAGS_FINAL, &dd->hash_flags))
+			err = s5p_hash_finish(req);
+	} else {
+		FLOW_LOG("s5p_sss: hash__finish_req error, no read msg\n");
+		ctx->flags |= BIT(HASH_FLAGS_ERROR);
+	}
+
+	/* atomic operation is not needed here */
+	dd->hash_flags &= ~(BIT(HASH_FLAGS_BUSY) | BIT(HASH_FLAGS_FINAL) |
+			    BIT(HASH_FLAGS_DMA_READY) |
+			    BIT(HASH_FLAGS_OUTPUT_READY));
+
+	if (req->base.complete)
+		req->base.complete(&req->base, err);
+}
+
+/**
+ * s5p_hash_handle_queue - handle hash queue
+ * @dd:		device s5p_aes_dev
+ * @req:	AHASH request
+ *
+ * If req!=NULL enqueue it
+ *
+ * Enqueues the current AHASH request on dd->queue and
+ * if FLAGS_BUSY is not set on the device then processes
+ * the first request from the dd->queue
+ *
+ * Returns: see s5p_hash_final below.
+ */
+static int s5p_hash_handle_queue(struct s5p_aes_dev *dd,
+				  struct ahash_request *req)
+{
+	struct crypto_async_request *async_req, *backlog;
+	struct s5p_hash_reqctx *ctx;
+	unsigned long flags;
+	int err = 0, ret = 0;
+
+retry:
+	FLOW_LOG("s5p_sss: hash_handle_queue\n");
+	spin_lock_irqsave(&dd->hash_lock, flags);
+	if (req)
+		ret = ahash_enqueue_request(&dd->hash_queue, req);
+	if (test_bit(HASH_FLAGS_BUSY, &dd->hash_flags)) {
+		spin_unlock_irqrestore(&dd->hash_lock, flags);
+		FLOW_LOG("s5p_sss: hash_handle_queue - exit, busy\n");
+		return ret;
+	}
+	backlog = crypto_get_backlog(&dd->hash_queue);
+	async_req = crypto_dequeue_request(&dd->hash_queue);
+	if (async_req)
+		set_bit(HASH_FLAGS_BUSY, &dd->hash_flags);
+	spin_unlock_irqrestore(&dd->hash_lock, flags);
+
+	if (!async_req) {
+		FLOW_LOG("s5p_sss: hash_handle_queue - exit, empty\n");
+		return ret;
+	}
+
+	FLOW_LOG("s5p_sss: hash_handle_queue - backlog\n");
+	if (backlog)
+		backlog->complete(backlog, -EINPROGRESS);
+
+	FLOW_LOG("s5p_sss: hash_handle_queue - async_req\n");
+	req = ahash_request_cast(async_req);
+	dd->hash_req = req;
+	ctx = ahash_request_ctx(req);
+
+	FLOW_LOG("s5p_sss: hash_handle_queue - prepare_req\n");
+	err = s5p_hash_prepare_request(req, ctx->op == HASH_OP_UPDATE);
+	if (err || !ctx->total)
+		goto err1;
+
+	dev_dbg(dd->dev, "handling new req, op: %u, nbytes: %d\n",
+						ctx->op, req->nbytes);
+
+	err = s5p_hash_hw_init(dd);
+	if (err)
+		goto err1;
+
+	dd->hash_err = 0;
+	if (ctx->digcnt)
+		/* request has changed - restore hash */
+		s5p_hash_write_iv(req);
+
+	if (ctx->op == HASH_OP_UPDATE) {
+		FLOW_LOG("s5p_sss: hash_handle_queue - op=UPDATE, finup=%d\n",
+			 (ctx->flags & BIT(HASH_FLAGS_FINUP)) != 0);
+		err = s5p_hash_update_req(dd);
+		if (err != -EINPROGRESS &&
+		   (ctx->flags & BIT(HASH_FLAGS_FINUP)))
+			/* no final() after finup() */
+			err = s5p_hash_final_req(dd);
+	} else if (ctx->op == HASH_OP_FINAL) {
+		FLOW_LOG("s5p_sss: hash_handle_queue - op=FINAL\n");
+		err = s5p_hash_final_req(dd);
+	}
+err1:
+	dev_dbg(dd->dev, "exit, err: %d\n", err);
+
+	if (err != -EINPROGRESS) {
+		/* hash_tasklet_cb will not finish it, so do it here */
+		s5p_hash_finish_req(req, err);
+		req = NULL;
+
+		/*
+		 * Execute next request immediately if there is anything
+		 * in queue.
+		 */
+		FLOW_LOG("s5p_sss: hash_handle_queue - retry\n");
+		goto retry;
+	}
+
+	FLOW_LOG("s5p_sss: hash_handle_queue - exit, ret=%d\n", ret);
+
+	return ret;
+}
+
+/**
+ * s5p_hash_tasklet_cb - hash tasklet
+ * @data:	ptr to s5p_aes_dev
+ *
+ */
+static void s5p_hash_tasklet_cb(unsigned long data)
+{
+	struct s5p_aes_dev *dd = (struct s5p_aes_dev *)data;
+	int err = 0;
+
+	FLOW_LOG("s5p_sss: hash_tasklet\n");
+	if (!test_bit(HASH_FLAGS_BUSY, &dd->hash_flags)) {
+		FLOW_LOG("s5p_sss: hash_tasklet not BUSY, handle queue\n");
+		s5p_hash_handle_queue(dd, NULL);
+		return;
+	}
+
+	if (test_bit(HASH_FLAGS_DMA_READY, &dd->hash_flags)) {
+		FLOW_LOG("s5p_sss: hash_tasklet DMA_READY\n");
+		if (test_and_clear_bit(HASH_FLAGS_DMA_ACTIVE,
+				       &dd->hash_flags)) {
+			FLOW_LOG("s5p_sss: hash_tasklet DMA_ACTIVE cleared\n");
+			s5p_hash_update_dma_stop(dd);
+			if (dd->hash_err) {
+				FLOW_LOG("s5p_sss: hash_tasklet hash_error\n");
+				err = dd->hash_err;
+				goto finish;
+			}
+		}
+		if (test_and_clear_bit(HASH_FLAGS_OUTPUT_READY,
+				       &dd->hash_flags)) {
+			/* hash or semi-hash ready */
+			FLOW_LOG("s5p_sss: hash_tasklet OUTPUT_READY\n");
+			clear_bit(HASH_FLAGS_DMA_READY, &dd->hash_flags);
+				goto finish;
+		}
+	}
+
+	return;
+
+finish:
+	FLOW_LOG("s5p_sss: hash_tasklet finish\n");
+	dev_dbg(dd->dev, "update done: err: %d\n", err);
+	/* finish curent request */
+	s5p_hash_finish_req(dd->hash_req, err);
+
+	/* If we are not busy, process next req */
+	if (!test_bit(HASH_FLAGS_BUSY, &dd->hash_flags))
+		s5p_hash_handle_queue(dd, NULL);
+}
+
+/**
+ * s5p_hash_enqueue - enqueue request
+ * @req:	AHASH request
+ * @op:		operation UPDATE or FINAL
+ *
+ * Sets the operation flag in the AHASH request context
+ * structure and calls s5p_hash_handle_queue().
+ *
+ * Returns: see s5p_hash_final below.
+ */
+static int s5p_hash_enqueue(struct ahash_request *req, unsigned int op)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+	struct s5p_aes_dev *dd = tctx->dd;
+
+	ctx->op = op;
+
+	return s5p_hash_handle_queue(dd, req);
+}
+
+/**
+ * s5p_hash_update - process the hash input data
+ * @req:	AHASH request
+ *
+ * If request will fit in buffer, copy it and return immediately
+ * else enqueue it wit OP_UPDATE.
+ *
+ * Returns: see s5p_hash_final below.
+ */
+static int s5p_hash_update(struct ahash_request *req)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+
+	FLOW_LOG("hash update len=%d", req->nbytes);
+	if (!req->nbytes)
+		return 0;
+
+	FLOW_DUMP("upd: ", req->src, req->nbytes);
+	if (ctx->bufcnt + req->nbytes <= BUFLEN) {
+		scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
+					 0, req->nbytes, 0);
+		ctx->bufcnt += req->nbytes;
+		return 0;
+	}
+
+	return s5p_hash_enqueue(req, HASH_OP_UPDATE);
+}
+
+/**
+ * s5p_hash_shash_digest - calculate shash digest
+ * @tfm:	crypto transformation
+ * @flags:	tfm flags
+ * @data:	input data
+ * @len:	length of data
+ * @out:	output buffer
+ */
+static int s5p_hash_shash_digest(struct crypto_shash *tfm, u32 flags,
+				  const u8 *data, unsigned int len, u8 *out)
+{
+	SHASH_DESC_ON_STACK(shash, tfm);
+
+	shash->tfm = tfm;
+	shash->flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	return crypto_shash_digest(shash, data, len, out);
+}
+
+/**
+ * s5p_hash_final_shash - calculate shash digest
+ * @req:	AHASH request
+ *
+ * calculate digest from ctx->buffer,
+ * with data length ctx->bufcnt,
+ * store digest in req->result
+ */
+static int s5p_hash_final_shash(struct ahash_request *req)
+{
+	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+
+	return s5p_hash_shash_digest(tctx->fallback, req->base.flags,
+				     ctx->buffer, ctx->bufcnt, req->result);
+}
+
+/**
+ * s5p_hash_final - close up hash and calculate digest
+ * @req:	AHASH request
+ *
+ * Set FLAGS_FINUP flag for the current AHASH request context.
+ *
+ * If there were no input data processed yet and the buffered
+ * hash data is less than BUFLEN (64) then calculate the final
+ * hash immediately by using SW algorithm fallback.
+ *
+ * Otherwise enqueues the current AHASH request with OP_FINAL
+ * operation flag and finalize hash message in HW.
+ * Note that if digcnt!=0 then there were previous update op,
+ * so there are always some buffered bytes in ctx->buffer,
+ * which means that ctx->bufcnt!=0
+ *
+ * Returns:
+ * 0 if the request has been processed immediately,
+ * -EINPROGRESS if the operation has been queued for later
+ *	execution or is set to processing by HW,
+ * -EBUSY if queue is full and request should be resubmitted later,
+ * other negative values on error.
+ *
+ * Note: req->src do not have any data
+ */
+static int s5p_hash_final(struct ahash_request *req)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+
+	FLOW_LOG("hash final");
+	ctx->flags |= BIT(HASH_FLAGS_FINUP);
+
+	if (ctx->flags & BIT(HASH_FLAGS_ERROR))
+		return -EINVAL; /* uncompleted hash is not needed */
+
+	/*
+	 * If message is small (digcnt==0) and buffersize is less
+	 * than BUFLEN, we use fallback, as using DMA + HW in this
+	 * case doesn't provide any benefit.
+	 * This is also the case for zero-length message.
+	 */
+	FLOW_LOG("hash final digcnt=%lld bufcnt=%d", ctx->digcnt, ctx->bufcnt);
+	if (!ctx->digcnt && ctx->bufcnt < BUFLEN)
+		return s5p_hash_final_shash(req);
+
+	WARN_ON(ctx->bufcnt == 0);
+
+	return s5p_hash_enqueue(req, HASH_OP_FINAL);
+}
+
+/**
+ * s5p_hash_finup - process last req->src and calculate digest
+ * @req:	AHASH request containing the last update data
+ *
+ * Set FLAGS_FINUP flag in context.
+ *
+ * Call update(req) and exit if it was enqueued or is being processing.
+ *
+ * If update returns without enqueue, call final(req).
+ *
+ * Return values: see s5p_hash_final above.
+ */
+static int s5p_hash_finup(struct ahash_request *req)
+{
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	int err1, err2;
+
+	FLOW_LOG("hash finup len=%d", req->nbytes);
+	ctx->flags |= BIT(HASH_FLAGS_FINUP);
+
+	FLOW_DUMP("fin: ", req->src, req->nbytes);
+	err1 = s5p_hash_update(req);
+	if (err1 == -EINPROGRESS || err1 == -EBUSY)
+		return err1;
+	/*
+	 * final() has to be always called to cleanup resources
+	 * even if update() failed, except EINPROGRESS
+	 * or calculate digest for small size
+	 */
+	err2 = s5p_hash_final(req);
+
+	return err1 ?: err2;
+}
+
+/**
+ * s5p_hash_init - initialize AHASH request contex
+ * @req:	AHASH request
+ *
+ * Init async hash request context.
+ */
+static int s5p_hash_init(struct ahash_request *req)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct s5p_hash_ctx *tctx = crypto_ahash_ctx(tfm);
+	struct s5p_hash_reqctx *ctx = ahash_request_ctx(req);
+	struct s5p_aes_dev *dd = tctx->dd;
+
+	ctx->dd = dd;
+	ctx->flags = 0;
+
+	dev_dbg(dd->dev, "init: digest size: %d\n",
+		crypto_ahash_digestsize(tfm));
+
+	switch (crypto_ahash_digestsize(tfm)) {
+	case MD5_DIGEST_SIZE:
+		ctx->flags |= HASH_FLAGS_MODE_MD5;
+		ctx->engine = SSS_HASH_ENGINE_MD5;
+		ctx->nregs = HASH_MD5_MAX_REG;
+		break;
+	case SHA1_DIGEST_SIZE:
+		ctx->flags |= HASH_FLAGS_MODE_SHA1;
+		ctx->engine = SSS_HASH_ENGINE_SHA1;
+		ctx->nregs = HASH_SHA1_MAX_REG;
+		break;
+	case SHA256_DIGEST_SIZE:
+		ctx->flags |= HASH_FLAGS_MODE_SHA256;
+		ctx->engine = SSS_HASH_ENGINE_SHA256;
+		ctx->nregs = HASH_SHA256_MAX_REG;
+		break;
+	}
+
+	ctx->bufcnt = 0;
+	ctx->digcnt = 0;
+	ctx->total = 0;
+	ctx->skip = 0;
+	ctx->buflen = BUFLEN;
+
+	return 0;
+}
+
+/**
+ * s5p_hash_digest - calculate digest from req->src
+ * @req:	AHASH request
+ *
+ * Return values: see s5p_hash_final above.
+ */
+static int s5p_hash_digest(struct ahash_request *req)
+{
+	FLOW_LOG("hash digest len=%d", req->nbytes);
+	FLOW_DUMP("dig: ", req->src, req->nbytes);
+
+	return s5p_hash_init(req) ?: s5p_hash_finup(req);
+}
+
+/**
+ * s5p_hash_cra_init_alg - init crypto alg transformation
+ * @tfm:	crypto transformation
+ */
+static int s5p_hash_cra_init_alg(struct crypto_tfm *tfm)
+{
+	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(tfm);
+	const char *alg_name = crypto_tfm_alg_name(tfm);
+
+	tctx->dd = s5p_dev;
+	/* Allocate a fallback and abort if it failed. */
+	tctx->fallback = crypto_alloc_shash(alg_name, 0,
+					    CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(tctx->fallback)) {
+		pr_err("fallback alloc fails for '%s'\n", alg_name);
+		return PTR_ERR(tctx->fallback);
+	}
+
+	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+				 sizeof(struct s5p_hash_reqctx) + BUFLEN);
+
+	return 0;
+}
+
+/**
+ * s5p_hash_cra_init - init crypto tfm
+ * @tfm:	crypto transformation
+ */
+static int s5p_hash_cra_init(struct crypto_tfm *tfm)
+{
+	return s5p_hash_cra_init_alg(tfm);
+}
+
+/**
+ * s5p_hash_cra_exit - exit crypto tfm
+ * @tfm:	crypto transformation
+ *
+ * free allocated fallback
+ */
+static void s5p_hash_cra_exit(struct crypto_tfm *tfm)
+{
+	struct s5p_hash_ctx *tctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_shash(tctx->fallback);
+	tctx->fallback = NULL;
+}
+
+/**
+ * s5p_hash_export - export hash state
+ * @req:	AHASH request
+ * @out:	buffer for exported state
+ */
+static int s5p_hash_export(struct ahash_request *req, void *out)
+{
+	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
+
+	FLOW_LOG("hash export");
+	memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
+
+	return 0;
+}
+
+/**
+ * s5p_hash_import - import hash state
+ * @req:	AHASH request
+ * @in:		buffer with state to be imported from
+ */
+static int s5p_hash_import(struct ahash_request *req, const void *in)
+{
+	struct s5p_hash_reqctx *rctx = ahash_request_ctx(req);
+	const struct s5p_hash_reqctx *ctx_in = in;
+
+	FLOW_LOG("hash import");
+	WARN_ON(ctx_in->bufcnt < 0);
+	WARN_ON(ctx_in->bufcnt > BUFLEN);
+	memcpy(rctx, in, sizeof(*rctx) + BUFLEN);
+
+	return 0;
+}
+
+/**
+ * struct algs_sha1_md5
+ */
+static struct ahash_alg algs_sha1_md5[] = {
+{
+	.init		= s5p_hash_init,
+	.update		= s5p_hash_update,
+	.final		= s5p_hash_final,
+	.finup		= s5p_hash_finup,
+	.digest		= s5p_hash_digest,
+	.halg.digestsize	= SHA1_DIGEST_SIZE,
+	.halg.base	= {
+		.cra_name		= "sha1",
+		.cra_driver_name	= "exynos-sha1",
+		.cra_priority		= 100,
+		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
+					  CRYPTO_ALG_KERN_DRIVER_ONLY |
+					  CRYPTO_ALG_ASYNC |
+					  CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize		= HASH_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
+		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
+		.cra_module		= THIS_MODULE,
+		.cra_init		= s5p_hash_cra_init,
+		.cra_exit		= s5p_hash_cra_exit,
+	}
+},
+{
+	.init		= s5p_hash_init,
+	.update		= s5p_hash_update,
+	.final		= s5p_hash_final,
+	.finup		= s5p_hash_finup,
+	.digest		= s5p_hash_digest,
+	.halg.digestsize	= MD5_DIGEST_SIZE,
+	.halg.base	= {
+		.cra_name		= "md5",
+		.cra_driver_name	= "exynos-md5",
+		.cra_priority		= 100,
+		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
+					  CRYPTO_ALG_KERN_DRIVER_ONLY |
+					  CRYPTO_ALG_ASYNC |
+					  CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize		= HASH_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
+		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
+		.cra_module		= THIS_MODULE,
+		.cra_init		= s5p_hash_cra_init,
+		.cra_exit		= s5p_hash_cra_exit,
+	}
+}
+};
+
+/**
+ * struct algs_sha256
+ */
+static struct ahash_alg algs_sha256[] = {
+{
+	.init		= s5p_hash_init,
+	.update		= s5p_hash_update,
+	.final		= s5p_hash_final,
+	.finup		= s5p_hash_finup,
+	.digest		= s5p_hash_digest,
+	.halg.digestsize	= SHA256_DIGEST_SIZE,
+	.halg.base	= {
+		.cra_name		= "sha256",
+		.cra_driver_name	= "exynos-sha256",
+		.cra_priority		= 100,
+		.cra_flags		= CRYPTO_ALG_TYPE_AHASH |
+					  CRYPTO_ALG_KERN_DRIVER_ONLY |
+					  CRYPTO_ALG_ASYNC |
+					  CRYPTO_ALG_NEED_FALLBACK,
+		.cra_blocksize		= HASH_BLOCK_SIZE,
+		.cra_ctxsize		= sizeof(struct s5p_hash_ctx),
+		.cra_alignmask		= SSS_DMA_ALIGN_MASK,
+		.cra_module		= THIS_MODULE,
+		.cra_init		= s5p_hash_cra_init,
+		.cra_exit		= s5p_hash_cra_exit,
+	}
+}
+};
+
+/**
+ * struct exynos_hash_algs_info
+ */
+static struct sss_hash_algs_info exynos_hash_algs_info[] = {
+	{
+		.algs_list	= algs_sha1_md5,
+		.size		= ARRAY_SIZE(algs_sha1_md5),
+	},
+	{
+		.algs_list	= algs_sha256,
+		.size		= ARRAY_SIZE(algs_sha256),
+	},
+};
+
+static void s5p_set_aes(struct s5p_aes_dev *dev,
+			uint8_t *key, uint8_t *iv, unsigned int keylen)
+{
+	void __iomem *keystart;
+
+	if (iv)
+		memcpy_toio(dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
+
+	if (keylen == AES_KEYSIZE_256)
+		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(0);
+	else if (keylen == AES_KEYSIZE_192)
+		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(2);
+	else
+		keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(4);
+
+	memcpy_toio(keystart, key, keylen);
+}
+
+static bool s5p_is_sg_aligned(struct scatterlist *sg)
+{
+	while (sg) {
+		if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
+			return false;
+		sg = sg_next(sg);
+	}
+
+	return true;
+}
+
+static int s5p_set_indata_start(struct s5p_aes_dev *dev,
+				struct ablkcipher_request *req)
+{
+	struct scatterlist *sg;
+	int err;
+
+	dev->sg_src_cpy = NULL;
+	sg = req->src;
+	if (!s5p_is_sg_aligned(sg)) {
+		dev_dbg(dev->dev,
+			"At least one unaligned source scatter list, making a copy\n");
+		err = s5p_make_sg_cpy(dev, sg, &dev->sg_src_cpy);
+		if (err)
+			return err;
+
+		sg = dev->sg_src_cpy;
+	}
+
+	err = s5p_set_indata(dev, sg);
+	if (err) {
+		s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
+		return err;
+	}
+
+	return 0;
+}
+
+static int s5p_set_outdata_start(struct s5p_aes_dev *dev,
+				struct ablkcipher_request *req)
+{
+	struct scatterlist *sg;
+	int err;
+
+	dev->sg_dst_cpy = NULL;
+	sg = req->dst;
+	if (!s5p_is_sg_aligned(sg)) {
+		dev_dbg(dev->dev,
+			"At least one unaligned dest scatter list, making a copy\n");
+		err = s5p_make_sg_cpy(dev, sg, &dev->sg_dst_cpy);
+		if (err)
+			return err;
+
+		sg = dev->sg_dst_cpy;
+	}
+
+	err = s5p_set_outdata(dev, sg);
+	if (err) {
+		s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
+		return err;
+	}
+
+	return 0;
+}
+
+static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
+{
+	struct ablkcipher_request *req = dev->req;
+	uint32_t aes_control;
+	unsigned long flags;
+	int err;
+
+	aes_control = SSS_AES_KEY_CHANGE_MODE;
+	if (mode & FLAGS_AES_DECRYPT)
+		aes_control |= SSS_AES_MODE_DECRYPT;
+
+	if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
+		aes_control |= SSS_AES_CHAIN_MODE_CBC;
+	else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
+		aes_control |= SSS_AES_CHAIN_MODE_CTR;
+
+	if (dev->ctx->keylen == AES_KEYSIZE_192)
+		aes_control |= SSS_AES_KEY_SIZE_192;
+	else if (dev->ctx->keylen == AES_KEYSIZE_256)
+		aes_control |= SSS_AES_KEY_SIZE_256;
+
+	aes_control |= SSS_AES_FIFO_MODE;
+
+	/* as a variant it is possible to use byte swapping on DMA side */
+	aes_control |= SSS_AES_BYTESWAP_DI
+		    |  SSS_AES_BYTESWAP_DO
+		    |  SSS_AES_BYTESWAP_IV
+		    |  SSS_AES_BYTESWAP_KEY
+		    |  SSS_AES_BYTESWAP_CNT;
+
+	spin_lock_irqsave(&dev->lock, flags);
+
+	SSS_WRITE(dev, FCINTENCLR,
+		  SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
+	SSS_WRITE(dev, FCFIFOCTRL, 0x00);
+
+	err = s5p_set_indata_start(dev, req);
+	if (err)
+		goto indata_error;
+
+	err = s5p_set_outdata_start(dev, req);
+	if (err)
+		goto outdata_error;
+
+	SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
+	s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
+
+	s5p_set_dma_indata(dev,  dev->sg_src);
+	s5p_set_dma_outdata(dev, dev->sg_dst);
+
+	SSS_WRITE(dev, FCINTENSET,
+		  SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
+
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	return;
+
+outdata_error:
+	s5p_unset_indata(dev);
 
 indata_error:
 	s5p_sg_done(dev);
@@ -822,13 +2540,16 @@ static struct crypto_alg algs[] = {
 	},
 };
 
+bool use_hash;
+
 static int s5p_aes_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	int i, j, err = -ENODEV;
+	int aes_i, hash_i, hash_algs_size = 0, j, err = -ENODEV;
 	struct samsung_aes_variant *variant;
 	struct s5p_aes_dev *pdata;
 	struct resource *res;
+	struct sss_hash_algs_info *hash_algs_i;
 
 	if (s5p_dev)
 		return -EEXIST;
@@ -837,12 +2558,38 @@ static int s5p_aes_probe(struct platform_device *pdev)
 	if (!pdata)
 		return -ENOMEM;
 
+	variant = find_s5p_sss_version(pdev);
+	pdata->pdata = variant;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(pdata->ioaddr))
-		return PTR_ERR(pdata->ioaddr);
+	/* HACK: HASH and PRNG uses the same registers in secss,
+	 * avoid overwrite each other. This will drop HASH when
+	 * CONFIG_EXYNOS_RNG is enabled.
+	 * We need larger size for HASH registers in secss, current
+	 * describe only AES/DES
+	 */
+	if (variant == &exynos_aes_data) {
+		pdata->pdata->hash_algs_info = exynos_hash_algs_info;
+		pdata->pdata->hash_algs_size =
+			ARRAY_SIZE(exynos_hash_algs_info);
+#ifndef CONFIG_CRYPTO_DEV_EXYNOS_RNG
+		res->end += 0x300;
+		use_hash = true;
+#endif
+	}
 
-	variant = find_s5p_sss_version(pdev);
+	pdata->res = res;
+	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->ioaddr)) {
+		if (!use_hash)
+			return PTR_ERR(pdata->ioaddr);
+		/* try AES without HASH */
+		res->end -= 0x300;
+		use_hash = false;
+		pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(pdata->ioaddr))
+			return PTR_ERR(pdata->ioaddr);
+	}
 
 	pdata->clk = devm_clk_get(dev, "secss");
 	if (IS_ERR(pdata->clk)) {
@@ -857,8 +2604,10 @@ static int s5p_aes_probe(struct platform_device *pdev)
 	}
 
 	spin_lock_init(&pdata->lock);
+	spin_lock_init(&pdata->hash_lock);
 
 	pdata->aes_ioaddr = pdata->ioaddr + variant->aes_offset;
+	pdata->io_hash_base = pdata->ioaddr + variant->hash_offset;
 
 	pdata->irq_fc = platform_get_irq(pdev, 0);
 	if (pdata->irq_fc < 0) {
@@ -877,27 +2626,69 @@ static int s5p_aes_probe(struct platform_device *pdev)
 	pdata->busy = false;
 	pdata->dev = dev;
 	platform_set_drvdata(pdev, pdata);
+
 	s5p_dev = pdata;
 
 	tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
 	crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
 
-	for (i = 0; i < ARRAY_SIZE(algs); i++) {
-		err = crypto_register_alg(&algs[i]);
-		if (err)
+	tasklet_init(&pdata->hash_tasklet, s5p_hash_tasklet_cb,
+		     (unsigned long)pdata);
+	crypto_init_queue(&pdata->hash_queue, SSS_HASH_QUEUE_LENGTH);
+
+	for (aes_i = 0; aes_i < ARRAY_SIZE(algs); aes_i++) {
+		err = crypto_register_alg(&algs[aes_i]);
+		if (err) {
+			dev_err(dev, "can't register '%s': %d\n",
+				algs[aes_i].cra_name, err);
 			goto err_algs;
+		}
+	}
+
+	if (use_hash)
+		hash_algs_size = pdata->pdata->hash_algs_size;
+
+	for (hash_i = 0; hash_i < hash_algs_size; hash_i++) {
+		hash_algs_i = pdata->pdata->hash_algs_info;
+		hash_algs_i[hash_i].registered = 0;
+		for (j = 0; j < hash_algs_i[hash_i].size; j++) {
+			struct ahash_alg *alg;
+
+			alg = &(hash_algs_i[hash_i].algs_list[j]);
+			alg->export = s5p_hash_export;
+			alg->import = s5p_hash_import;
+			alg->halg.statesize = sizeof(struct s5p_hash_reqctx) +
+					      BUFLEN;
+			err = crypto_register_ahash(alg);
+			if (err) {
+				dev_err(dev, "can't register '%s': %d\n",
+					alg->halg.base.cra_driver_name, err);
+				goto err_hash;
+			}
+			FLOW_LOG("alg registered: %s\n",
+				 alg->halg.base.cra_driver_name);
+
+			hash_algs_i[hash_i].registered++;
+		}
 	}
 
 	dev_info(dev, "s5p-sss driver registered\n");
 
 	return 0;
 
+err_hash:
+	for (hash_i = hash_algs_size - 1; hash_i >= 0; hash_i--)
+		for (j = hash_algs_i[hash_i].registered - 1;
+		     j >= 0; j--)
+			crypto_unregister_ahash(
+				&(hash_algs_i[hash_i].algs_list[j]));
+
 err_algs:
-	dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
 
-	for (j = 0; j < i; j++)
+	for (j = 0; j < aes_i; j++)
 		crypto_unregister_alg(&algs[j]);
 
+	tasklet_kill(&pdata->hash_tasklet);
 	tasklet_kill(&pdata->tasklet);
 
 err_irq:
@@ -911,7 +2702,8 @@ static int s5p_aes_probe(struct platform_device *pdev)
 static int s5p_aes_remove(struct platform_device *pdev)
 {
 	struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
-	int i;
+	struct sss_hash_algs_info *hash_algs_i;
+	int i, j;
 
 	if (!pdata)
 		return -ENODEV;
@@ -919,9 +2711,20 @@ static int s5p_aes_remove(struct platform_device *pdev)
 	for (i = 0; i < ARRAY_SIZE(algs); i++)
 		crypto_unregister_alg(&algs[i]);
 
+	hash_algs_i = pdata->pdata->hash_algs_info;
+	for (i = pdata->pdata->hash_algs_size - 1; i >= 0; i--)
+		for (j = hash_algs_i[i].registered - 1; j >= 0; j--)
+			crypto_unregister_ahash(
+				&(hash_algs_i[i].algs_list[j]));
+
+	tasklet_kill(&pdata->hash_tasklet);
 	tasklet_kill(&pdata->tasklet);
 
 	clk_disable_unprepare(pdata->clk);
+	if (use_hash) {
+		pdata->res->end -= 0x300;
+		use_hash = false;
+	}
 
 	s5p_dev = NULL;
 
@@ -942,3 +2745,4 @@ module_platform_driver(s5p_aes_crypto);
 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");
+MODULE_AUTHOR("Kamil Konieczny <k.konieczny@partner.samsung.com>");
-- 
2.14.1.536.g6867272d5b56