diff --git a/crypto/async_tx/Kconfig b/crypto/async_tx/Kconfig
index d8fb391..b1705d1 100644
--- a/crypto/async_tx/Kconfig
+++ b/crypto/async_tx/Kconfig
@@ -14,3 +14,7 @@ config ASYNC_MEMSET
 	tristate
 	select ASYNC_CORE
 
+config ASYNC_PQXOR
+	tristate
+	select ASYNC_CORE
+
diff --git a/crypto/async_tx/Makefile b/crypto/async_tx/Makefile
index 27baa7d..32d6ce2 100644
--- a/crypto/async_tx/Makefile
+++ b/crypto/async_tx/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_ASYNC_CORE) += async_tx.o
 obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o
 obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o
 obj-$(CONFIG_ASYNC_XOR) += async_xor.o
+obj-$(CONFIG_ASYNC_PQXOR) += async_pqxor.o
diff --git a/crypto/async_tx/async_pqxor.c b/crypto/async_tx/async_pqxor.c
new file mode 100644
index 0000000..547d72a
--- /dev/null
+++ b/crypto/async_tx/async_pqxor.c
@@ -0,0 +1,532 @@
+/*
+ *	Copyright(c) 2007 Yuri Tikhonov <yur@emcraft.com>
+ *
+ *	Developed for DENX Software Engineering GmbH
+ *
+ *	Asynchronous GF-XOR calculations ASYNC_TX API.
+ *
+ *	based on async_xor.c code written by:
+ *		Dan Williams <dan.j.williams@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/raid/xor.h>
+#include <linux/async_tx.h>
+
+#include "../drivers/md/raid6.h"
+
+/**
+ *  The following static variables are used in cases of synchronous
+ * zero sum to save the values to check. Two pages used for zero sum and
+ * the third one is for dumb P destination when calling gen_syndrome()
+ */
+static spinlock_t spare_lock;
+struct page *spare_pages[3];
+
+/**
+ * do_async_pqxor - asynchronously calculate P and/or Q
+ */
+static struct dma_async_tx_descriptor *
+do_async_pqxor(struct dma_chan *chan, struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scoef_list,
+	unsigned int offset, unsigned int src_cnt, size_t len,
+	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_device *dma = chan->device;
+	struct page *dest;
+	dma_addr_t dma_dest[2];
+	dma_addr_t dma_src[src_cnt];
+	unsigned char *scf = qdest ? scoef_list : NULL;
+	struct dma_async_tx_descriptor *tx;
+	int i, dst_cnt = 0;
+	unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
+
+	if (flags & ASYNC_TX_XOR_ZERO_DST)
+		dma_prep_flags |= DMA_PREP_ZERO_DST;
+
+	/*  One parity (P or Q) calculation is initiated always;
+	 * first always try Q
+	 */
+	dest = qdest ? qdest : pdest;
+	dma_dest[dst_cnt++] = dma_map_page(dma->dev, dest, offset, len,
+					    DMA_FROM_DEVICE);
+
+	/* Switch to the next destination */
+	if (qdest && pdest) {
+		/* Both destinations are set, thus here we deal with P */
+		dma_dest[dst_cnt++] = dma_map_page(dma->dev, pdest, offset,
+						len, DMA_FROM_DEVICE);
+	}
+
+	for (i = 0; i < src_cnt; i++)
+		dma_src[i] = dma_map_page(dma->dev, src_list[i],
+			offset, len, DMA_TO_DEVICE);
+
+	/* Since we have clobbered the src_list we are committed
+	 * to doing this asynchronously.  Drivers force forward progress
+	 * in case they can not provide a descriptor
+	 */
+	tx = dma->device_prep_dma_pqxor(chan, dma_dest, dst_cnt, dma_src,
+					   src_cnt, scf, len, dma_prep_flags);
+	if (unlikely(!tx)) {
+		async_tx_quiesce(&depend_tx);
+
+		while (unlikely(!tx)) {
+			dma_async_issue_pending(chan);
+			tx = dma->device_prep_dma_pqxor(chan,
+							   dma_dest, dst_cnt,
+							   dma_src, src_cnt,
+							   scf, len,
+							   dma_prep_flags);
+		}
+	}
+
+	async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+
+	return tx;
+}
+
+/**
+ * do_sync_pqxor - synchronously calculate P and Q
+ */
+static void
+do_sync_pqxor(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scoef_list, unsigned int offset,
+	unsigned int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	int i, pos;
+	uint8_t *p, *q, *src;
+
+	/* set destination addresses */
+	p = pdest ? (uint8_t *)(page_address(pdest) + offset) : NULL;
+	q = (uint8_t *)(page_address(qdest) + offset);
+
+	if (flags & ASYNC_TX_XOR_ZERO_DST) {
+		if (p)
+			memset(p, 0, len);
+		memset(q, 0, len);
+	}
+
+	for (i = 0; i < src_cnt; i++) {
+		src = (uint8_t *)(page_address(src_list[i]) + offset);
+		for (pos = 0; pos < len; pos++) {
+			if (p)
+				p[pos] ^= src[pos];
+			q[pos] ^= raid6_gfmul[scoef_list[i]][src[pos]];
+		}
+	}
+	async_tx_sync_epilog(cb_fn, cb_param);
+}
+
+/**
+ * async_pqxor - attempt to calculate RS-syndrome and XOR in parallel using
+ *	a dma engine.
+ * @pdest: destination page for P-parity (XOR)
+ * @qdest: destination page for Q-parity (GF-XOR)
+ * @src_list: array of source pages
+ * @src_coef_list: array of source coefficients used in GF-multiplication
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_ASSUME_COHERENT,
+ *	ASYNC_TX_ACK, ASYNC_TX_DEP_ACK, ASYNC_TX_ASYNC_ONLY
+ * @depend_tx: depends on the result of this transaction.
+ * @callback: function to call when the operation completes
+ * @callback_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_pqxor(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scoef_list,
+	unsigned int offset, int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param)
+{
+	struct page *dest[2];
+	struct dma_chan *chan;
+	struct dma_device *device;
+	struct dma_async_tx_descriptor *tx = NULL;
+
+	BUG_ON(!pdest && !qdest);
+
+	dest[0] = pdest;
+	dest[1] = qdest;
+
+	chan = async_tx_find_channel(depend_tx, DMA_PQ_XOR,
+				     dest, 2, src_list, src_cnt, len);
+	device = chan ? chan->device : NULL;
+
+	if (!device && (flags & ASYNC_TX_ASYNC_ONLY))
+		return NULL;
+
+	if (device) { /* run the xor asynchronously */
+		tx = do_async_pqxor(chan, pdest, qdest, src_list,
+			       scoef_list, offset, src_cnt, len, flags,
+			       depend_tx, callback,callback_param);
+	} else { /* run the pqxor synchronously */
+		if (!qdest) {
+			struct page *tsrc[src_cnt + 1];
+			struct page **lsrc = src_list;
+			if (!(flags & ASYNC_TX_XOR_ZERO_DST)) {
+				tsrc[0] = pdest;
+				memcpy(tsrc + 1, src_list, src_cnt *
+						sizeof(struct page *));
+				lsrc = tsrc;
+				src_cnt++;
+				flags |= ASYNC_TX_XOR_DROP_DST;
+			}
+			return async_xor(pdest, lsrc, offset, src_cnt, len,
+					flags, depend_tx,
+					callback, callback_param);
+		}
+
+		/* wait for any prerequisite operations */
+		async_tx_quiesce(&depend_tx);
+
+		do_sync_pqxor(pdest, qdest, src_list, scoef_list,
+			offset,	src_cnt, len, flags, depend_tx,
+			callback, callback_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_pqxor);
+
+/**
+ * do_sync_gen_syndrome - synchronously calculate P and Q
+ */
+static void
+do_sync_gen_syndrome(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned int offset,
+	unsigned int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param)
+{
+	int i;
+	void *tsrc[src_cnt + 2];
+
+	for (i = 0; i < src_cnt; i++)
+		tsrc[i] = page_address(src_list[i]) + offset;
+
+	/* set destination addresses */
+	tsrc[i++] = page_address(pdest) + offset;
+	tsrc[i++] = page_address(qdest) + offset;
+
+	if (flags & ASYNC_TX_XOR_ZERO_DST) {
+		memset(tsrc[i-2], 0, len);
+		memset(tsrc[i-1], 0, len);
+	}
+
+	raid6_call.gen_syndrome(i, len, tsrc);
+	async_tx_sync_epilog(callback, callback_param);
+}
+
+/**
+ * async_gen_syndrome - attempt to calculate RS-syndrome and XOR in parallel
+ * using a dma engine.
+ * @pdest: destination page for P-parity (XOR)
+ * @qdest: destination page for Q-parity (GF-XOR)
+ * @src_list: array of source pages
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_ASSUME_COHERENT,
+ *	ASYNC_TX_ACK, ASYNC_TX_DEP_ACK, ASYNC_TX_ASYNC_ONLY
+ * @depend_tx: depends on the result of this transaction.
+ * @callback: function to call when the operation completes
+ * @callback_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_gen_syndrome(struct page *pdest, struct page *qdest,
+	struct page **src_list,	unsigned int offset, int src_cnt, size_t len,
+	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param)
+{
+	struct page *dest[2];
+	struct dma_chan *chan;
+	struct dma_device *device;
+	struct dma_async_tx_descriptor *tx = NULL;
+
+	dest[0] = pdest;
+	dest[1] = qdest;
+
+	chan = async_tx_find_channel(depend_tx, DMA_PQ_XOR,
+				     dest, 2, src_list, src_cnt, len);
+	device = chan ? chan->device : NULL;
+
+	if (!device && (flags & ASYNC_TX_ASYNC_ONLY))
+		return NULL;
+
+	if (device) { /* run the xor asynchronously */
+		tx = do_async_pqxor(chan, pdest, qdest, src_list,
+			       (uint8_t *)raid6_gfexp, offset, src_cnt,
+			       len, flags, depend_tx, callback, callback_param);
+	} else { /* run the pqxor synchronously */
+		if (!qdest) {
+			struct page *tsrc[src_cnt + 1];
+			struct page **lsrc = src_list;
+			if (!(flags & ASYNC_TX_XOR_ZERO_DST)) {
+				tsrc[0] = pdest;
+				memcpy(tsrc + 1, src_list, src_cnt *
+						sizeof(struct page *));
+				lsrc = tsrc;
+				src_cnt++;
+				flags |= ASYNC_TX_XOR_DROP_DST;
+			}
+			return async_xor(pdest, lsrc, offset, src_cnt, len,
+					flags, depend_tx,
+					callback, callback_param);
+		}
+
+		/* may do synchronous PQ only when both destinations exsists */
+		if (!pdest)
+			pdest = spare_pages[2];
+
+		/* wait for any prerequisite operations */
+		async_tx_quiesce(&depend_tx);
+
+		do_sync_gen_syndrome(pdest, qdest, src_list,
+			offset,	src_cnt, len, flags, depend_tx,
+			callback, callback_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_gen_syndrome);
+
+/**
+ * async_pqxor_zero_sum - attempt a PQ parities check with a dma engine.
+ * @pdest: P-parity destination to check
+ * @qdest: Q-parity destination to check
+ * @src_list: array of source pages; the 1st pointer is qdest, the 2nd - pdest.
+ * @scoef_list: coefficients to use in GF-multiplications
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @presult: 0 if P parity is OK else non-zero
+ * @qresult: 0 if Q parity is OK else non-zero
+ * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: depends on the result of this transaction.
+ * @callback: function to call when the xor completes
+ * @callback_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_pqxor_zero_sum(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scf,
+	unsigned int offset, int src_cnt, size_t len,
+	u32 *presult, u32 *qresult, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx,
+						      DMA_PQ_ZERO_SUM,
+						      src_list, 2, &src_list[2],
+						      src_cnt, len);
+	struct dma_device *device = chan ? chan->device : NULL;
+	struct dma_async_tx_descriptor *tx = NULL;
+
+	BUG_ON(src_cnt <= 1);
+	BUG_ON(!qdest || qdest != src_list[0] || pdest != src_list[1]);
+
+	if (device) {
+		dma_addr_t dma_src[src_cnt];
+		unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
+		int i;
+
+		for (i = 0; i < src_cnt; i++)
+			dma_src[i] = src_list[i] ? dma_map_page(device->dev,
+					src_list[i], offset, len,
+					DMA_TO_DEVICE) : 0;
+
+		tx = device->device_prep_dma_pqzero_sum(chan, dma_src, src_cnt,
+						      scf, len,
+						      presult, qresult,
+						      dma_prep_flags);
+
+		if (unlikely(!tx)) {
+			async_tx_quiesce(&depend_tx);
+
+			while (unlikely(!tx)) {
+				dma_async_issue_pending(chan);
+				tx = device->device_prep_dma_pqzero_sum(chan,
+						dma_src, src_cnt, scf, len,
+						presult, qresult,
+						dma_prep_flags);
+			}
+		}
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else {
+		unsigned long lflags = flags;
+
+		/* TBD: support for lengths size of more than PAGE_SIZE */
+
+		lflags &= ~ASYNC_TX_ACK;
+		lflags |= ASYNC_TX_XOR_ZERO_DST;
+
+		spin_lock(&spare_lock);
+		tx = async_pqxor(spare_pages[0], spare_pages[1],
+				 &src_list[2], scf, offset,
+				 src_cnt - 2, len, lflags,
+				 depend_tx, NULL, NULL);
+
+		async_tx_quiesce(&tx);
+
+		if (presult && pdest)
+			*presult = memcmp(page_address(pdest) + offset,
+					   page_address(spare_pages[0]) +
+					   offset, len) == 0 ? 0 : 1;
+		if (qresult && qdest)
+			*qresult = memcmp(page_address(qdest) + offset,
+					   page_address(spare_pages[1]) +
+					   offset, len) == 0 ? 0 : 1;
+		spin_unlock(&spare_lock);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_pqxor_zero_sum);
+
+/**
+ * async_syndrome_zero_sum - attempt a PQ parities check with a dma engine.
+ * @pdest: P-parity destination to check
+ * @qdest: Q-parity destination to check
+ * @src_list: array of source pages; the 1st pointer is qdest, the 2nd - pdest.
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @presult: 0 if P parity is OK else non-zero
+ * @qresult: 0 if Q parity is OK else non-zero
+ * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: depends on the result of this transaction.
+ * @callback: function to call when the xor completes
+ * @callback_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_syndrome_zero_sum(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned int offset, int src_cnt, size_t len,
+	u32 *presult, u32 *qresult, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx,
+						      DMA_PQ_ZERO_SUM,
+						      src_list, 2, &src_list[2],
+						      src_cnt, len);
+	struct dma_device *device = chan ? chan->device : NULL;
+	struct dma_async_tx_descriptor *tx = NULL;
+
+	BUG_ON(src_cnt <= 1);
+	BUG_ON(!qdest || qdest != src_list[0] || pdest != src_list[1]);
+
+	if (device) {
+		dma_addr_t dma_src[src_cnt];
+		unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
+		int i;
+
+		for (i = 0; i < src_cnt; i++)
+			dma_src[i] = src_list[i] ? dma_map_page(device->dev,
+					src_list[i], offset, len,
+					DMA_TO_DEVICE) : 0;
+
+		tx = device->device_prep_dma_pqzero_sum(chan, dma_src, src_cnt,
+						      (uint8_t *)raid6_gfexp,
+						      len, presult, qresult,
+						      dma_prep_flags);
+
+		if (unlikely(!tx)) {
+			async_tx_quiesce(&depend_tx);
+			while (unlikely(!tx)) {
+				dma_async_issue_pending(chan);
+				tx = device->device_prep_dma_pqzero_sum(chan,
+						dma_src, src_cnt,
+						(uint8_t *)raid6_gfexp, len,
+						presult, qresult,
+						dma_prep_flags);
+			}
+		}
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else {
+		unsigned long lflags = flags;
+
+		/* TBD: support for lengths size of more than PAGE_SIZE */
+
+		lflags &= ~ASYNC_TX_ACK;
+		lflags |= ASYNC_TX_XOR_ZERO_DST;
+
+		spin_lock(&spare_lock);
+		tx = async_gen_syndrome(spare_pages[0], spare_pages[1],
+					&src_list[2], offset,
+					src_cnt - 2, len, lflags,
+					depend_tx, NULL, NULL);
+		async_tx_quiesce(&tx);
+
+		if (presult && pdest)
+			*presult = memcmp(page_address(pdest) + offset,
+					   page_address(spare_pages[0]) +
+					   offset, len) == 0 ? 0 : 1;
+		if (qresult && qdest)
+			*qresult = memcmp(page_address(qdest) + offset,
+					   page_address(spare_pages[1]) +
+					   offset, len) == 0 ? 0 : 1;
+		spin_unlock(&spare_lock);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_syndrome_zero_sum);
+
+static int __init async_pqxor_init(void)
+{
+	spin_lock_init(&spare_lock);
+
+	spare_pages[0] = alloc_page(GFP_KERNEL);
+	if (!spare_pages[0])
+		goto abort;
+	spare_pages[1] = alloc_page(GFP_KERNEL);
+	if (!spare_pages[1])
+		goto abort;
+	spare_pages[2] = alloc_page(GFP_KERNEL);
+
+	return 0;
+abort:
+	safe_put_page(spare_pages[0]);
+	safe_put_page(spare_pages[1]);
+	printk(KERN_ERR "%s: cannot allocate spare!\n", __func__);
+	return -ENOMEM;
+}
+
+static void __exit async_pqxor_exit(void)
+{
+	safe_put_page(spare_pages[0]);
+	safe_put_page(spare_pages[1]);
+	safe_put_page(spare_pages[2]);
+}
+
+module_init(async_pqxor_init);
+module_exit(async_pqxor_exit);
+
+MODULE_AUTHOR("Yuri Tikhonov <yur@emcraft.com>");
+MODULE_DESCRIPTION("asynchronous qxor/qxor-zero-sum api");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
index 0f50d4c..9038b06 100644
--- a/include/linux/async_tx.h
+++ b/include/linux/async_tx.h
@@ -50,12 +50,15 @@ struct dma_chan_ref {
  * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
  * dependency chain
  * @ASYNC_TX_DEP_ACK: ack the dependency descriptor.  Useful for chaining.
+ * @ASYNC_TX_ASYNC_ONLY: if set then try to perform operation requested in
+ * asynchronous way only.
  */
 enum async_tx_flags {
 	ASYNC_TX_XOR_ZERO_DST	 = (1 << 0),
 	ASYNC_TX_XOR_DROP_DST	 = (1 << 1),
 	ASYNC_TX_ACK		 = (1 << 3),
 	ASYNC_TX_DEP_ACK	 = (1 << 4),
+	ASYNC_TX_ASYNC_ONLY	 = (1 << 5),
 };
 
 #ifdef CONFIG_DMA_ENGINE
@@ -146,5 +149,33 @@ async_trigger_callback(enum async_tx_flags flags,
 	struct dma_async_tx_descriptor *depend_tx,
 	dma_async_tx_callback cb_fn, void *cb_fn_param);
 
+struct dma_async_tx_descriptor *
+async_pqxor(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scoef_list,
+	unsigned int offset, int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param);
+
+struct dma_async_tx_descriptor *
+async_gen_syndrome(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned int offset, int src_cnt, size_t len,
+	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param);
+
+struct dma_async_tx_descriptor *
+async_pqxor_zero_sum(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned char *scoef_list,
+	unsigned int offset, int src_cnt, size_t len,
+	u32 *presult, u32 *qresult, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param);
+
+struct dma_async_tx_descriptor *
+async_syndrome_zero_sum(struct page *pdest, struct page *qdest,
+	struct page **src_list, unsigned int offset, int src_cnt, size_t len,
+	u32 *presult, u32 *qresult, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback callback, void *callback_param);
+
 void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
 #endif /* _ASYNC_TX_H_ */
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index adb0b08..51b7238 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -123,6 +123,7 @@ enum dma_ctrl_flags {
 	DMA_CTRL_ACK = (1 << 1),
 	DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2),
 	DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3),
+	DMA_PREP_ZERO_DST = (1 << 4),
 };
 
 /**
@@ -308,7 +309,9 @@ struct dma_async_tx_descriptor {
  * @device_free_chan_resources: release DMA channel's resources
  * @device_prep_dma_memcpy: prepares a memcpy operation
  * @device_prep_dma_xor: prepares a xor operation
+ * @device_prep_dma_pqxor: prepares a pq-xor operation
  * @device_prep_dma_zero_sum: prepares a zero_sum operation
+ * @device_prep_dma_pqzero_sum: prepares a pqzero_sum operation
  * @device_prep_dma_memset: prepares a memset operation
  * @device_prep_dma_interrupt: prepares an end of chain interrupt operation
  * @device_prep_slave_sg: prepares a slave dma operation
@@ -339,9 +342,17 @@ struct dma_device {
 	struct dma_async_tx_descriptor *(*device_prep_dma_xor)(
 		struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 		unsigned int src_cnt, size_t len, unsigned long flags);
+	struct dma_async_tx_descriptor *(*device_prep_dma_pqxor)(
+		struct dma_chan *chan, dma_addr_t *dst, unsigned int dst_cnt,
+		dma_addr_t *src, unsigned int src_cnt, unsigned char *scf,
+		size_t len, unsigned long flags);
 	struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)(
 		struct dma_chan *chan, dma_addr_t *src,	unsigned int src_cnt,
 		size_t len, u32 *result, unsigned long flags);
+	struct dma_async_tx_descriptor *(*device_prep_dma_pqzero_sum)(
+		struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
+		unsigned char *scf,
+		size_t len, u32 *presult, u32 *qresult, unsigned long flags);
 	struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
 		struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
 		unsigned long flags);
