dmaengine: add driver for Freescale MPC85xx DMA controller

The driver implements DMA engine API for Freescale MPC85xx DMA controller,
which could be used by devices in the silicon.  The driver supports the
Basic mode of Freescale MPC85xx DMA controller.  The MPC85xx processors
supported include MPC8540/60, MPC8555, MPC8548, MPC8641 and so on.

The MPC83xx(MPC8349, MPC8360) are also supported.

[kamalesh@linux.vnet.ibm.com: build fix]
[dan.j.williams@intel.com: merge mm fixes, rebase on async_tx-2.6.25]
Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Ebony Zhu <ebony.zhu@freescale.com>
Acked-by: Kumar Gala <galak@gate.crashing.org>
Cc: Shannon Nelson <shannon.nelson@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

MAINTAINERS

@@ -1589,6 +1589,13 @@ L:	linux-fbdev-devel@lists.sourceforge.net (moderated for non-subscribers)
 W:	http://linux-fbdev.sourceforge.net/
 S:	Maintained
 
+FREESCALE DMA DRIVER
+P;	Zhang Wei
+M:	wei.zhang@freescale.com
+L:	linuxppc-embedded@ozlabs.org
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+
 FREESCALE SOC FS_ENET DRIVER
 P:	Pantelis Antoniou
 M:	pantelis.antoniou@gmail.com

drivers/dma/Kconfig

@@ -4,7 +4,7 @@
 
 menuconfig DMADEVICES
 	bool "DMA Engine support"
-	depends on (PCI && X86) || ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX
+	depends on (PCI && X86) || ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX || PPC
 	depends on !HIGHMEM64G
 	help
 	  DMA engines can do asynchronous data transfers without
@@ -37,6 +37,23 @@ config INTEL_IOP_ADMA
 	help
 	  Enable support for the Intel(R) IOP Series RAID engines.
 
+config FSL_DMA
+	bool "Freescale MPC85xx/MPC83xx DMA support"
+	depends on PPC
+	select DMA_ENGINE
+	---help---
+	  Enable support for the Freescale DMA engine. Now, it support
+	  MPC8560/40, MPC8555, MPC8548 and MPC8641 processors.
+	  The MPC8349, MPC8360 is also supported.
+
+config FSL_DMA_SELFTEST
+	bool "Enable the self test for each DMA channel"
+	depends on FSL_DMA
+	default y
+	---help---
+	  Enable the self test for each DMA channel. A self test will be
+	  performed after the channel probed to ensure the DMA works well.
+
 config DMA_ENGINE
 	bool
 

drivers/dma/Makefile

@@ -3,3 +3,4 @@ obj-$(CONFIG_NET_DMA) += iovlock.o
 obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o
 ioatdma-objs := ioat.o ioat_dma.o ioat_dca.o
 obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
+obj-$(CONFIG_FSL_DMA) += fsldma.o

drivers/dma/fsldma.c

+/*
+ * Freescale MPC85xx, MPC83xx DMA Engine support
+ *
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author:
+ *   Zhang Wei <wei.zhang@freescale.com>, Jul 2007
+ *   Ebony Zhu <ebony.zhu@freescale.com>, May 2007
+ *
+ * Description:
+ *   DMA engine driver for Freescale MPC8540 DMA controller, which is
+ *   also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc.
+ *   The support for MPC8349 DMA contorller is also added.
+ *
+ * This 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/of_platform.h>
+
+#include "fsldma.h"
+
+static void dma_init(struct fsl_dma_chan *fsl_chan)
+{
+	/* Reset the channel */
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, 0, 32);
+
+	switch (fsl_chan->feature & FSL_DMA_IP_MASK) {
+	case FSL_DMA_IP_85XX:
+		/* Set the channel to below modes:
+		 * EIE - Error interrupt enable
+		 * EOSIE - End of segments interrupt enable (basic mode)
+		 * EOLNIE - End of links interrupt enable
+		 */
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EIE
+				| FSL_DMA_MR_EOLNIE | FSL_DMA_MR_EOSIE, 32);
+		break;
+	case FSL_DMA_IP_83XX:
+		/* Set the channel to below modes:
+		 * EOTIE - End-of-transfer interrupt enable
+		 */
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr, FSL_DMA_MR_EOTIE,
+				32);
+		break;
+	}
+
+}
+
+static void set_sr(struct fsl_dma_chan *fsl_chan, dma_addr_t val)
+{
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->sr, val, 32);
+}
+
+static dma_addr_t get_sr(struct fsl_dma_chan *fsl_chan)
+{
+	return DMA_IN(fsl_chan, &fsl_chan->reg_base->sr, 32);
+}
+
+static void set_desc_cnt(struct fsl_dma_chan *fsl_chan,
+				struct fsl_dma_ld_hw *hw, u32 count)
+{
+	hw->count = CPU_TO_DMA(fsl_chan, count, 32);
+}
+
+static void set_desc_src(struct fsl_dma_chan *fsl_chan,
+				struct fsl_dma_ld_hw *hw, dma_addr_t src)
+{
+	u64 snoop_bits;
+
+	snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
+		? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0;
+	hw->src_addr = CPU_TO_DMA(fsl_chan, snoop_bits | src, 64);
+}
+
+static void set_desc_dest(struct fsl_dma_chan *fsl_chan,
+				struct fsl_dma_ld_hw *hw, dma_addr_t dest)
+{
+	u64 snoop_bits;
+
+	snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX)
+		? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0;
+	hw->dst_addr = CPU_TO_DMA(fsl_chan, snoop_bits | dest, 64);
+}
+
+static void set_desc_next(struct fsl_dma_chan *fsl_chan,
+				struct fsl_dma_ld_hw *hw, dma_addr_t next)
+{
+	u64 snoop_bits;
+
+	snoop_bits = ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX)
+		? FSL_DMA_SNEN : 0;
+	hw->next_ln_addr = CPU_TO_DMA(fsl_chan, snoop_bits | next, 64);
+}
+
+static void set_cdar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr)
+{
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->cdar, addr | FSL_DMA_SNEN, 64);
+}
+
+static dma_addr_t get_cdar(struct fsl_dma_chan *fsl_chan)
+{
+	return DMA_IN(fsl_chan, &fsl_chan->reg_base->cdar, 64) & ~FSL_DMA_SNEN;
+}
+
+static void set_ndar(struct fsl_dma_chan *fsl_chan, dma_addr_t addr)
+{
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->ndar, addr, 64);
+}
+
+static dma_addr_t get_ndar(struct fsl_dma_chan *fsl_chan)
+{
+	return DMA_IN(fsl_chan, &fsl_chan->reg_base->ndar, 64);
+}
+
+static int dma_is_idle(struct fsl_dma_chan *fsl_chan)
+{
+	u32 sr = get_sr(fsl_chan);
+	return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH);
+}
+
+static void dma_start(struct fsl_dma_chan *fsl_chan)
+{
+	u32 mr_set = 0;;
+
+	if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) {
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32);
+		mr_set |= FSL_DMA_MR_EMP_EN;
+	} else
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32)
+				& ~FSL_DMA_MR_EMP_EN, 32);
+
+	if (fsl_chan->feature & FSL_DMA_CHAN_START_EXT)
+		mr_set |= FSL_DMA_MR_EMS_EN;
+	else
+		mr_set |= FSL_DMA_MR_CS;
+
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32)
+			| mr_set, 32);
+}
+
+static void dma_halt(struct fsl_dma_chan *fsl_chan)
+{
+	int i = 0;
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+		DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA,
+		32);
+	DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+		DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS
+		| FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32);
+
+	while (!dma_is_idle(fsl_chan) && (i++ < 100))
+		udelay(10);
+	if (i >= 100 && !dma_is_idle(fsl_chan))
+		dev_err(fsl_chan->dev, "DMA halt timeout!\n");
+}
+
+static void set_ld_eol(struct fsl_dma_chan *fsl_chan,
+			struct fsl_desc_sw *desc)
+{
+	desc->hw.next_ln_addr = CPU_TO_DMA(fsl_chan,
+		DMA_TO_CPU(fsl_chan, desc->hw.next_ln_addr, 64)	| FSL_DMA_EOL,
+		64);
+}
+
+static void append_ld_queue(struct fsl_dma_chan *fsl_chan,
+		struct fsl_desc_sw *new_desc)
+{
+	struct fsl_desc_sw *queue_tail = to_fsl_desc(fsl_chan->ld_queue.prev);
+
+	if (list_empty(&fsl_chan->ld_queue))
+		return;
+
+	/* Link to the new descriptor physical address and
+	 * Enable End-of-segment interrupt for
+	 * the last link descriptor.
+	 * (the previous node's next link descriptor)
+	 *
+	 * For FSL_DMA_IP_83xx, the snoop enable bit need be set.
+	 */
+	queue_tail->hw.next_ln_addr = CPU_TO_DMA(fsl_chan,
+			new_desc->async_tx.phys | FSL_DMA_EOSIE |
+			(((fsl_chan->feature & FSL_DMA_IP_MASK)
+				== FSL_DMA_IP_83XX) ? FSL_DMA_SNEN : 0), 64);
+}
+
+/**
+ * fsl_chan_set_src_loop_size - Set source address hold transfer size
+ * @fsl_chan : Freescale DMA channel
+ * @size     : Address loop size, 0 for disable loop
+ *
+ * The set source address hold transfer size. The source
+ * address hold or loop transfer size is when the DMA transfer
+ * data from source address (SA), if the loop size is 4, the DMA will
+ * read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA,
+ * SA + 1 ... and so on.
+ */
+static void fsl_chan_set_src_loop_size(struct fsl_dma_chan *fsl_chan, int size)
+{
+	switch (size) {
+	case 0:
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) &
+			(~FSL_DMA_MR_SAHE), 32);
+		break;
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) |
+			FSL_DMA_MR_SAHE | (__ilog2(size) << 14),
+			32);
+		break;
+	}
+}
+
+/**
+ * fsl_chan_set_dest_loop_size - Set destination address hold transfer size
+ * @fsl_chan : Freescale DMA channel
+ * @size     : Address loop size, 0 for disable loop
+ *
+ * The set destination address hold transfer size. The destination
+ * address hold or loop transfer size is when the DMA transfer
+ * data to destination address (TA), if the loop size is 4, the DMA will
+ * write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA,
+ * TA + 1 ... and so on.
+ */
+static void fsl_chan_set_dest_loop_size(struct fsl_dma_chan *fsl_chan, int size)
+{
+	switch (size) {
+	case 0:
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) &
+			(~FSL_DMA_MR_DAHE), 32);
+		break;
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) |
+			FSL_DMA_MR_DAHE | (__ilog2(size) << 16),
+			32);
+		break;
+	}
+}
+
+/**
+ * fsl_chan_toggle_ext_pause - Toggle channel external pause status
+ * @fsl_chan : Freescale DMA channel
+ * @size     : Pause control size, 0 for disable external pause control.
+ *             The maximum is 1024.
+ *
+ * The Freescale DMA channel can be controlled by the external
+ * signal DREQ#. The pause control size is how many bytes are allowed
+ * to transfer before pausing the channel, after which a new assertion
+ * of DREQ# resumes channel operation.
+ */
+static void fsl_chan_toggle_ext_pause(struct fsl_dma_chan *fsl_chan, int size)
+{
+	if (size > 1024)
+		return;
+
+	if (size) {
+		DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
+			DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32)
+				| ((__ilog2(size) << 24) & 0x0f000000),
+			32);
+		fsl_chan->feature |= FSL_DMA_CHAN_PAUSE_EXT;
+	} else
+		fsl_chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT;
+}
+
+/**
+ * fsl_chan_toggle_ext_start - Toggle channel external start status
+ * @fsl_chan : Freescale DMA channel
+ * @enable   : 0 is disabled, 1 is enabled.
+ *
+ * If enable the external start, the channel can be started by an
+ * external DMA start pin. So the dma_start() does not start the
+ * transfer immediately. The DMA channel will wait for the
+ * control pin asserted.
+ */
+static void fsl_chan_toggle_ext_start(struct fsl_dma_chan *fsl_chan, int enable)
+{
+	if (enable)
+		fsl_chan->feature |= FSL_DMA_CHAN_START_EXT;
+	else
+		fsl_chan->feature &= ~FSL_DMA_CHAN_START_EXT;
+}
+
+static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+	struct fsl_desc_sw *desc = tx_to_fsl_desc(tx);
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(tx->chan);
+	unsigned long flags;
+	dma_cookie_t cookie;
+
+	/* cookie increment and adding to ld_queue must be atomic */
+	spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+
+	cookie = fsl_chan->common.cookie;
+	cookie++;
+	if (cookie < 0)
+		cookie = 1;
+	desc->async_tx.cookie = cookie;
+	fsl_chan->common.cookie = desc->async_tx.cookie;
+
+	append_ld_queue(fsl_chan, desc);
+	list_splice_init(&desc->async_tx.tx_list, fsl_chan->ld_queue.prev);
+
+	spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+
+	return cookie;
+}
+
+/**
+ * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool.
+ * @fsl_chan : Freescale DMA channel
+ *
+ * Return - The descriptor allocated. NULL for failed.
+ */
+static struct fsl_desc_sw *fsl_dma_alloc_descriptor(
+					struct fsl_dma_chan *fsl_chan)
+{
+	dma_addr_t pdesc;
+	struct fsl_desc_sw *desc_sw;
+
+	desc_sw = dma_pool_alloc(fsl_chan->desc_pool, GFP_ATOMIC, &pdesc);
+	if (desc_sw) {
+		memset(desc_sw, 0, sizeof(struct fsl_desc_sw));
+		dma_async_tx_descriptor_init(&desc_sw->async_tx,
+						&fsl_chan->common);
+		desc_sw->async_tx.tx_submit = fsl_dma_tx_submit;
+		INIT_LIST_HEAD(&desc_sw->async_tx.tx_list);
+		desc_sw->async_tx.phys = pdesc;
+	}
+
+	return desc_sw;
+}
+
+
+/**
+ * fsl_dma_alloc_chan_resources - Allocate resources for DMA channel.
+ * @fsl_chan : Freescale DMA channel
+ *
+ * This function will create a dma pool for descriptor allocation.
+ *
+ * Return - The number of descriptors allocated.
+ */
+static int fsl_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
+	LIST_HEAD(tmp_list);
+
+	/* We need the descriptor to be aligned to 32bytes
+	 * for meeting FSL DMA specification requirement.
+	 */
+	fsl_chan->desc_pool = dma_pool_create("fsl_dma_engine_desc_pool",
+			fsl_chan->dev, sizeof(struct fsl_desc_sw),
+			32, 0);
+	if (!fsl_chan->desc_pool) {
+		dev_err(fsl_chan->dev, "No memory for channel %d "
+			"descriptor dma pool.\n", fsl_chan->id);
+		return 0;
+	}
+
+	return 1;
+}
+
+/**
+ * fsl_dma_free_chan_resources - Free all resources of the channel.
+ * @fsl_chan : Freescale DMA channel
+ */
+static void fsl_dma_free_chan_resources(struct dma_chan *chan)
+{
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
+	struct fsl_desc_sw *desc, *_desc;
+	unsigned long flags;
+
+	dev_dbg(fsl_chan->dev, "Free all channel resources.\n");
+	spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+	list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) {
+#ifdef FSL_DMA_LD_DEBUG
+		dev_dbg(fsl_chan->dev,
+				"LD %p will be released.\n", desc);
+#endif
+		list_del(&desc->node);
+		/* free link descriptor */
+		dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys);
+	}
+	spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+	dma_pool_destroy(fsl_chan->desc_pool);
+}
+
+static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
+	struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
+	size_t len, unsigned long flags)
+{
+	struct fsl_dma_chan *fsl_chan;
+	struct fsl_desc_sw *first = NULL, *prev = NULL, *new;
+	size_t copy;
+	LIST_HEAD(link_chain);
+
+	if (!chan)
+		return NULL;
+
+	if (!len)
+		return NULL;
+
+	fsl_chan = to_fsl_chan(chan);
+
+	do {
+
+		/* Allocate the link descriptor from DMA pool */
+		new = fsl_dma_alloc_descriptor(fsl_chan);
+		if (!new) {
+			dev_err(fsl_chan->dev,
+					"No free memory for link descriptor\n");
+			return NULL;
+		}
+#ifdef FSL_DMA_LD_DEBUG
+		dev_dbg(fsl_chan->dev, "new link desc alloc %p\n", new);
+#endif
+
+		copy = min(len, FSL_DMA_BCR_MAX_CNT);
+
+		set_desc_cnt(fsl_chan, &new->hw, copy);
+		set_desc_src(fsl_chan, &new->hw, dma_src);
+		set_desc_dest(fsl_chan, &new->hw, dma_dest);
+
+		if (!first)
+			first = new;
+		else
+			set_desc_next(fsl_chan, &prev->hw, new->async_tx.phys);
+
+		new->async_tx.cookie = 0;
+		new->async_tx.ack = 1;
+
+		prev = new;
+		len -= copy;
+		dma_src += copy;
+		dma_dest += copy;
+
+		/* Insert the link descriptor to the LD ring */
+		list_add_tail(&new->node, &first->async_tx.tx_list);
+	} while (len);
+
+	new->async_tx.ack = 0; /* client is in control of this ack */
+	new->async_tx.cookie = -EBUSY;
+
+	/* Set End-of-link to the last link descriptor of new list*/
+	set_ld_eol(fsl_chan, new);
+
+	return first ? &first->async_tx : NULL;
+}
+
+/**
+ * fsl_dma_update_completed_cookie - Update the completed cookie.
+ * @fsl_chan : Freescale DMA channel
+ */
+static void fsl_dma_update_completed_cookie(struct fsl_dma_chan *fsl_chan)
+{
+	struct fsl_desc_sw *cur_desc, *desc;
+	dma_addr_t ld_phy;
+
+	ld_phy = get_cdar(fsl_chan) & FSL_DMA_NLDA_MASK;
+
+	if (ld_phy) {
+		cur_desc = NULL;
+		list_for_each_entry(desc, &fsl_chan->ld_queue, node)
+			if (desc->async_tx.phys == ld_phy) {
+				cur_desc = desc;
+				break;
+			}
+
+		if (cur_desc && cur_desc->async_tx.cookie) {
+			if (dma_is_idle(fsl_chan))
+				fsl_chan->completed_cookie =
+					cur_desc->async_tx.cookie;
+			else
+				fsl_chan->completed_cookie =
+					cur_desc->async_tx.cookie - 1;
+		}
+	}
+}
+
+/**
+ * fsl_chan_ld_cleanup - Clean up link descriptors
+ * @fsl_chan : Freescale DMA channel
+ *
+ * This function clean up the ld_queue of DMA channel.
+ * If 'in_intr' is set, the function will move the link descriptor to
+ * the recycle list. Otherwise, free it directly.
+ */
+static void fsl_chan_ld_cleanup(struct fsl_dma_chan *fsl_chan)
+{
+	struct fsl_desc_sw *desc, *_desc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+
+	fsl_dma_update_completed_cookie(fsl_chan);
+	dev_dbg(fsl_chan->dev, "chan completed_cookie = %d\n",
+			fsl_chan->completed_cookie);
+	list_for_each_entry_safe(desc, _desc, &fsl_chan->ld_queue, node) {
+		dma_async_tx_callback callback;
+		void *callback_param;
+
+		if (dma_async_is_complete(desc->async_tx.cookie,
+			    fsl_chan->completed_cookie, fsl_chan->common.cookie)
+				== DMA_IN_PROGRESS)
+			break;
+
+		callback = desc->async_tx.callback;
+		callback_param = desc->async_tx.callback_param;
+
+		/* Remove from ld_queue list */
+		list_del(&desc->node);
+
+		dev_dbg(fsl_chan->dev, "link descriptor %p will be recycle.\n",
+				desc);
+		dma_pool_free(fsl_chan->desc_pool, desc, desc->async_tx.phys);
+
+		/* Run the link descriptor callback function */
+		if (callback) {
+			spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+			dev_dbg(fsl_chan->dev, "link descriptor %p callback\n",
+					desc);
+			callback(callback_param);
+			spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+		}
+	}
+	spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+}
+
+/**
+ * fsl_chan_xfer_ld_queue - Transfer link descriptors in channel ld_queue.
+ * @fsl_chan : Freescale DMA channel
+ */
+static void fsl_chan_xfer_ld_queue(struct fsl_dma_chan *fsl_chan)
+{
+	struct list_head *ld_node;
+	dma_addr_t next_dest_addr;
+	unsigned long flags;
+
+	if (!dma_is_idle(fsl_chan))
+		return;
+
+	dma_halt(fsl_chan);
+
+	/* If there are some link descriptors
+	 * not transfered in queue. We need to start it.
+	 */
+	spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+
+	/* Find the first un-transfer desciptor */
+	for (ld_node = fsl_chan->ld_queue.next;
+		(ld_node != &fsl_chan->ld_queue)
+			&& (dma_async_is_complete(
+				to_fsl_desc(ld_node)->async_tx.cookie,
+				fsl_chan->completed_cookie,
+				fsl_chan->common.cookie) == DMA_SUCCESS);
+		ld_node = ld_node->next);
+
+	spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+
+	if (ld_node != &fsl_chan->ld_queue) {
+		/* Get the ld start address from ld_queue */
+		next_dest_addr = to_fsl_desc(ld_node)->async_tx.phys;
+		dev_dbg(fsl_chan->dev, "xfer LDs staring from 0x%016llx\n",
+				(u64)next_dest_addr);
+		set_cdar(fsl_chan, next_dest_addr);
+		dma_start(fsl_chan);
+	} else {
+		set_cdar(fsl_chan, 0);
+		set_ndar(fsl_chan, 0);
+	}
+}
+
+/**
+ * fsl_dma_memcpy_issue_pending - Issue the DMA start command
+ * @fsl_chan : Freescale DMA channel
+ */
+static void fsl_dma_memcpy_issue_pending(struct dma_chan *chan)
+{
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
+
+#ifdef FSL_DMA_LD_DEBUG
+	struct fsl_desc_sw *ld;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fsl_chan->desc_lock, flags);
+	if (list_empty(&fsl_chan->ld_queue)) {
+		spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+		return;
+	}
+
+	dev_dbg(fsl_chan->dev, "--memcpy issue--\n");
+	list_for_each_entry(ld, &fsl_chan->ld_queue, node) {
+		int i;
+		dev_dbg(fsl_chan->dev, "Ch %d, LD %08x\n",
+				fsl_chan->id, ld->async_tx.phys);
+		for (i = 0; i < 8; i++)
+			dev_dbg(fsl_chan->dev, "LD offset %d: %08x\n",
+					i, *(((u32 *)&ld->hw) + i));
+	}
+	dev_dbg(fsl_chan->dev, "----------------\n");
+	spin_unlock_irqrestore(&fsl_chan->desc_lock, flags);
+#endif
+
+	fsl_chan_xfer_ld_queue(fsl_chan);
+}
+
+static void fsl_dma_dependency_added(struct dma_chan *chan)
+{
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
+
+	fsl_chan_ld_cleanup(fsl_chan);
+}
+
+/**
+ * fsl_dma_is_complete - Determine the DMA status
+ * @fsl_chan : Freescale DMA channel
+ */
+static enum dma_status fsl_dma_is_complete(struct dma_chan *chan,
+					dma_cookie_t cookie,
+					dma_cookie_t *done,
+					dma_cookie_t *used)
+{
+	struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
+	dma_cookie_t last_used;
+	dma_cookie_t last_complete;
+
+	fsl_chan_ld_cleanup(fsl_chan);
+
+	last_used = chan->cookie;
+	last_complete = fsl_chan->completed_cookie;
+
+	if (done)
+		*done = last_complete;
+
+	if (used)
+		*used = last_used;
+
+	return dma_async_is_complete(cookie, last_complete, last_used);
+}
+
+static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
+{
+	struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data;
+	dma_addr_t stat;
+
+	stat = get_sr(fsl_chan);
+	dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n",
+						fsl_chan->id, stat);
+	set_sr(fsl_chan, stat);		/* Clear the event register */
+
+	stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH);
+	if (!stat)
+		return IRQ_NONE;
+
+	if (stat & FSL_DMA_SR_TE)
+		dev_err(fsl_chan->dev, "Transfer Error!\n");
+
+	/* If the link descriptor segment transfer finishes,
+	 * we will recycle the used descriptor.
+	 */
+	if (stat & FSL_DMA_SR_EOSI) {
+		dev_dbg(fsl_chan->dev, "event: End-of-segments INT\n");
+		dev_dbg(fsl_chan->dev, "event: clndar 0x%016llx, "
+				"nlndar 0x%016llx\n", (u64)get_cdar(fsl_chan),
+				(u64)get_ndar(fsl_chan));
+		stat &= ~FSL_DMA_SR_EOSI;
+		fsl_chan_ld_cleanup(fsl_chan);
+	}
+
+	/* If it current transfer is the end-of-transfer,
+	 * we should clear the Channel Start bit for
+	 * prepare next transfer.
+	 */
+	if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) {
+		dev_dbg(fsl_chan->dev, "event: End-of-link INT\n");
+		stat &= ~FSL_DMA_SR_EOLNI;
+		fsl_chan_xfer_ld_queue(fsl_chan);
+	}
+
+	if (stat)
+		dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n",
+					stat);
+
+	dev_dbg(fsl_chan->dev, "event: Exit\n");
+	tasklet_schedule(&fsl_chan->tasklet);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t fsl_dma_do_interrupt(int irq, void *data)
+{
+	struct fsl_dma_device *fdev = (struct fsl_dma_device *)data;
+	u32 gsr;
+	int ch_nr;
+
+	gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->reg_base)
+			: in_le32(fdev->reg_base);
+	ch_nr = (32 - ffs(gsr)) / 8;
+
+	return fdev->chan[ch_nr] ? fsl_dma_chan_do_interrupt(irq,
+			fdev->chan[ch_nr]) : IRQ_NONE;
+}
+
+static void dma_do_tasklet(unsigned long data)
+{
+	struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data;
+	fsl_chan_ld_cleanup(fsl_chan);
+}
+
+static void fsl_dma_callback_test(struct fsl_dma_chan *fsl_chan)
+{
+	if (fsl_chan)
+		dev_info(fsl_chan->dev, "selftest: callback is ok!\n");
+}
+
+static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan)
+{
+	struct dma_chan *chan;
+	int err = 0;
+	dma_addr_t dma_dest, dma_src;
+	dma_cookie_t cookie;
+	u8 *src, *dest;
+	int i;
+	size_t test_size;
+	struct dma_async_tx_descriptor *tx1, *tx2, *tx3;
+
+	test_size = 4096;
+
+	src = kmalloc(test_size * 2, GFP_KERNEL);
+	if (!src) {
+		dev_err(fsl_chan->dev,
+				"selftest: Cannot alloc memory for test!\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	dest = src + test_size;
+
+	for (i = 0; i < test_size; i++)
+		src[i] = (u8) i;
+
+	chan = &fsl_chan->common;
+
+	if (fsl_dma_alloc_chan_resources(chan) < 1) {
+		dev_err(fsl_chan->dev,
+				"selftest: Cannot alloc resources for DMA\n");
+		err = -ENODEV;
+		goto out;
+	}
+
+	/* TX 1 */
+	dma_src = dma_map_single(fsl_chan->dev, src, test_size / 2,
+				 DMA_TO_DEVICE);
+	dma_dest = dma_map_single(fsl_chan->dev, dest, test_size / 2,
+				  DMA_FROM_DEVICE);
+	tx1 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 2, 0);
+	async_tx_ack(tx1);
+
+	cookie = fsl_dma_tx_submit(tx1);
+	fsl_dma_memcpy_issue_pending(chan);
+	msleep(2);
+
+	if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+		dev_err(fsl_chan->dev, "selftest: Time out!\n");
+		err = -ENODEV;
+		goto out;
+	}
+
+	/* Test free and re-alloc channel resources */
+	fsl_dma_free_chan_resources(chan);
+
+	if (fsl_dma_alloc_chan_resources(chan) < 1) {
+		dev_err(fsl_chan->dev,
+				"selftest: Cannot alloc resources for DMA\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
+
+	/* Continue to test
+	 * TX 2
+	 */
+	dma_src = dma_map_single(fsl_chan->dev, src + test_size / 2,
+					test_size / 4, DMA_TO_DEVICE);
+	dma_dest = dma_map_single(fsl_chan->dev, dest + test_size / 2,
+					test_size / 4, DMA_FROM_DEVICE);
+	tx2 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0);
+	async_tx_ack(tx2);
+
+	/* TX 3 */
+	dma_src = dma_map_single(fsl_chan->dev, src + test_size * 3 / 4,
+					test_size / 4, DMA_TO_DEVICE);
+	dma_dest = dma_map_single(fsl_chan->dev, dest + test_size * 3 / 4,
+					test_size / 4, DMA_FROM_DEVICE);
+	tx3 = fsl_dma_prep_memcpy(chan, dma_dest, dma_src, test_size / 4, 0);
+	async_tx_ack(tx3);
+
+	/* Test exchanging the prepared tx sort */
+	cookie = fsl_dma_tx_submit(tx3);
+	cookie = fsl_dma_tx_submit(tx2);
+
+#ifdef FSL_DMA_CALLBACKTEST
+	if (dma_has_cap(DMA_INTERRUPT, ((struct fsl_dma_device *)
+	    dev_get_drvdata(fsl_chan->dev->parent))->common.cap_mask)) {
+		tx3->callback = fsl_dma_callback_test;
+		tx3->callback_param = fsl_chan;
+	}
+#endif
+	fsl_dma_memcpy_issue_pending(chan);
+	msleep(2);
+
+	if (fsl_dma_is_complete(chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+		dev_err(fsl_chan->dev, "selftest: Time out!\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
+
+	err = memcmp(src, dest, test_size);
+	if (err) {
+		for (i = 0; (*(src + i) == *(dest + i)) && (i < test_size);
+				i++);
+		dev_err(fsl_chan->dev, "selftest: Test failed, data %d/%d is "
+				"error! src 0x%x, dest 0x%x\n",
+				i, test_size, *(src + i), *(dest + i));
+	}
+
+free_resources:
+	fsl_dma_free_chan_resources(chan);
+out:
+	kfree(src);
+	return err;
+}
+
+static int __devinit of_fsl_dma_chan_probe(struct of_device *dev,
+			const struct of_device_id *match)
+{
+	struct fsl_dma_device *fdev;
+	struct fsl_dma_chan *new_fsl_chan;
+	int err;
+
+	fdev = dev_get_drvdata(dev->dev.parent);
+	BUG_ON(!fdev);
+
+	/* alloc channel */
+	new_fsl_chan = kzalloc(sizeof(struct fsl_dma_chan), GFP_KERNEL);
+	if (!new_fsl_chan) {
+		dev_err(&dev->dev, "No free memory for allocating "
+				"dma channels!\n");
+		err = -ENOMEM;
+		goto err;
+	}
+
+	/* get dma channel register base */
+	err = of_address_to_resource(dev->node, 0, &new_fsl_chan->reg);
+	if (err) {
+		dev_err(&dev->dev, "Can't get %s property 'reg'\n",
+				dev->node->full_name);
+		goto err;
+	}
+
+	new_fsl_chan->feature = *(u32 *)match->data;
+
+	if (!fdev->feature)
+		fdev->feature = new_fsl_chan->feature;
+
+	/* If the DMA device's feature is different than its channels',
+	 * report the bug.
+	 */
+	WARN_ON(fdev->feature != new_fsl_chan->feature);
+
+	new_fsl_chan->dev = &dev->dev;
+	new_fsl_chan->reg_base = ioremap(new_fsl_chan->reg.start,
+			new_fsl_chan->reg.end - new_fsl_chan->reg.start + 1);
+
+	new_fsl_chan->id = ((new_fsl_chan->reg.start - 0x100) & 0xfff) >> 7;
+	if (new_fsl_chan->id > FSL_DMA_MAX_CHANS_PER_DEVICE) {
+		dev_err(&dev->dev, "There is no %d channel!\n",
+				new_fsl_chan->id);
+		err = -EINVAL;
+		goto err;
+	}
+	fdev->chan[new_fsl_chan->id] = new_fsl_chan;
+	tasklet_init(&new_fsl_chan->tasklet, dma_do_tasklet,
+			(unsigned long)new_fsl_chan);
+
+	/* Init the channel */
+	dma_init(new_fsl_chan);
+
+	/* Clear cdar registers */
+	set_cdar(new_fsl_chan, 0);
+
+	switch (new_fsl_chan->feature & FSL_DMA_IP_MASK) {
+	case FSL_DMA_IP_85XX:
+		new_fsl_chan->toggle_ext_start = fsl_chan_toggle_ext_start;
+		new_fsl_chan->toggle_ext_pause = fsl_chan_toggle_ext_pause;
+	case FSL_DMA_IP_83XX:
+		new_fsl_chan->set_src_loop_size = fsl_chan_set_src_loop_size;
+		new_fsl_chan->set_dest_loop_size = fsl_chan_set_dest_loop_size;
+	}
+
+	spin_lock_init(&new_fsl_chan->desc_lock);
+	INIT_LIST_HEAD(&new_fsl_chan->ld_queue);
+
+	new_fsl_chan->common.device = &fdev->common;
+
+	/* Add the channel to DMA device channel list */
+	list_add_tail(&new_fsl_chan->common.device_node,
+			&fdev->common.channels);
+	fdev->common.chancnt++;
+
+	new_fsl_chan->irq = irq_of_parse_and_map(dev->node, 0);
+	if (new_fsl_chan->irq != NO_IRQ) {
+		err = request_irq(new_fsl_chan->irq,
+					&fsl_dma_chan_do_interrupt, IRQF_SHARED,
+					"fsldma-channel", new_fsl_chan);
+		if (err) {
+			dev_err(&dev->dev, "DMA channel %s request_irq error "
+				"with return %d\n", dev->node->full_name, err);
+			goto err;
+		}
+	}
+
+#ifdef CONFIG_FSL_DMA_SELFTEST
+	err = fsl_dma_self_test(new_fsl_chan);
+	if (err)
+		goto err;
+#endif
+
+	dev_info(&dev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id,
+				match->compatible, new_fsl_chan->irq);
+
+	return 0;
+err:
+	dma_halt(new_fsl_chan);
+	iounmap(new_fsl_chan->reg_base);
+	free_irq(new_fsl_chan->irq, new_fsl_chan);
+	list_del(&new_fsl_chan->common.device_node);
+	kfree(new_fsl_chan);
+	return err;
+}
+
+const u32 mpc8540_dma_ip_feature = FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN;
+const u32 mpc8349_dma_ip_feature = FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN;
+
+static struct of_device_id of_fsl_dma_chan_ids[] = {
+	{
+		.compatible = "fsl,mpc8540-dma-channel",
+		.data = (void *)&mpc8540_dma_ip_feature,
+	},
+	{
+		.compatible = "fsl,mpc8349-dma-channel",
+		.data = (void *)&mpc8349_dma_ip_feature,
+	},
+	{}
+};
+
+static struct of_platform_driver of_fsl_dma_chan_driver = {
+	.name = "of-fsl-dma-channel",
+	.match_table = of_fsl_dma_chan_ids,
+	.probe = of_fsl_dma_chan_probe,
+};
+
+static __init int of_fsl_dma_chan_init(void)
+{
+	return of_register_platform_driver(&of_fsl_dma_chan_driver);
+}
+
+static int __devinit of_fsl_dma_probe(struct of_device *dev,
+			const struct of_device_id *match)
+{
+	int err;
+	unsigned int irq;
+	struct fsl_dma_device *fdev;
+
+	fdev = kzalloc(sizeof(struct fsl_dma_device), GFP_KERNEL);
+	if (!fdev) {
+		dev_err(&dev->dev, "No enough memory for 'priv'\n");
+		err = -ENOMEM;
+		goto err;
+	}
+	fdev->dev = &dev->dev;
+	INIT_LIST_HEAD(&fdev->common.channels);
+
+	/* get DMA controller register base */
+	err = of_address_to_resource(dev->node, 0, &fdev->reg);
+	if (err) {
+		dev_err(&dev->dev, "Can't get %s property 'reg'\n",
+				dev->node->full_name);
+		goto err;
+	}
+
+	dev_info(&dev->dev, "Probe the Freescale DMA driver for %s "
+			"controller at 0x%08x...\n",
+			match->compatible, fdev->reg.start);
+	fdev->reg_base = ioremap(fdev->reg.start, fdev->reg.end
+						- fdev->reg.start + 1);
+
+	dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, fdev->common.cap_mask);
+	fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources;
+	fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources;
+	fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy;
+	fdev->common.device_is_tx_complete = fsl_dma_is_complete;
+	fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
+	fdev->common.device_dependency_added = fsl_dma_dependency_added;
+	fdev->common.dev = &dev->dev;
+
+	irq = irq_of_parse_and_map(dev->node, 0);
+	if (irq != NO_IRQ) {
+		err = request_irq(irq, &fsl_dma_do_interrupt, IRQF_SHARED,
+					"fsldma-device", fdev);
+		if (err) {
+			dev_err(&dev->dev, "DMA device request_irq error "
+				"with return %d\n", err);
+			goto err;
+		}
+	}
+
+	dev_set_drvdata(&(dev->dev), fdev);
+	of_platform_bus_probe(dev->node, of_fsl_dma_chan_ids, &dev->dev);
+
+	dma_async_device_register(&fdev->common);
+	return 0;
+
+err:
+	iounmap(fdev->reg_base);
+	kfree(fdev);
+	return err;
+}
+
+static struct of_device_id of_fsl_dma_ids[] = {
+	{ .compatible = "fsl,mpc8540-dma", },
+	{ .compatible = "fsl,mpc8349-dma", },
+	{}
+};
+
+static struct of_platform_driver of_fsl_dma_driver = {
+	.name = "of-fsl-dma",
+	.match_table = of_fsl_dma_ids,
+	.probe = of_fsl_dma_probe,
+};
+
+static __init int of_fsl_dma_init(void)
+{
+	return of_register_platform_driver(&of_fsl_dma_driver);
+}
+
+subsys_initcall(of_fsl_dma_chan_init);
+subsys_initcall(of_fsl_dma_init);

drivers/dma/fsldma.h

+/*
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Author:
+ *   Zhang Wei <wei.zhang@freescale.com>, Jul 2007
+ *   Ebony Zhu <ebony.zhu@freescale.com>, May 2007
+ *
+ * This 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.
+ *
+ */
+#ifndef __DMA_FSLDMA_H
+#define __DMA_FSLDMA_H
+
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/dmaengine.h>
+
+/* Define data structures needed by Freescale
+ * MPC8540 and MPC8349 DMA controller.
+ */
+#define FSL_DMA_MR_CS		0x00000001
+#define FSL_DMA_MR_CC		0x00000002
+#define FSL_DMA_MR_CA		0x00000008
+#define FSL_DMA_MR_EIE		0x00000040
+#define FSL_DMA_MR_XFE		0x00000020
+#define FSL_DMA_MR_EOLNIE	0x00000100
+#define FSL_DMA_MR_EOLSIE	0x00000080
+#define FSL_DMA_MR_EOSIE	0x00000200
+#define FSL_DMA_MR_CDSM		0x00000010
+#define FSL_DMA_MR_CTM		0x00000004
+#define FSL_DMA_MR_EMP_EN	0x00200000
+#define FSL_DMA_MR_EMS_EN	0x00040000
+#define FSL_DMA_MR_DAHE		0x00002000
+#define FSL_DMA_MR_SAHE		0x00001000
+
+/* Special MR definition for MPC8349 */
+#define FSL_DMA_MR_EOTIE	0x00000080
+
+#define FSL_DMA_SR_CH		0x00000020
+#define FSL_DMA_SR_CB		0x00000004
+#define FSL_DMA_SR_TE		0x00000080
+#define FSL_DMA_SR_EOSI		0x00000002
+#define FSL_DMA_SR_EOLSI	0x00000001
+#define FSL_DMA_SR_EOCDI	0x00000001
+#define FSL_DMA_SR_EOLNI	0x00000008
+
+#define FSL_DMA_SATR_SBPATMU			0x20000000
+#define FSL_DMA_SATR_STRANSINT_RIO		0x00c00000
+#define FSL_DMA_SATR_SREADTYPE_SNOOP_READ	0x00050000
+#define FSL_DMA_SATR_SREADTYPE_BP_IORH		0x00020000
+#define FSL_DMA_SATR_SREADTYPE_BP_NREAD		0x00040000
+#define FSL_DMA_SATR_SREADTYPE_BP_MREAD		0x00070000
+
+#define FSL_DMA_DATR_DBPATMU			0x20000000
+#define FSL_DMA_DATR_DTRANSINT_RIO		0x00c00000
+#define FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE	0x00050000
+#define FSL_DMA_DATR_DWRITETYPE_BP_FLUSH	0x00010000
+
+#define FSL_DMA_EOL		((u64)0x1)
+#define FSL_DMA_SNEN		((u64)0x10)
+#define FSL_DMA_EOSIE		0x8
+#define FSL_DMA_NLDA_MASK	(~(u64)0x1f)
+
+#define FSL_DMA_BCR_MAX_CNT	0x03ffffffu
+
+#define FSL_DMA_DGSR_TE		0x80
+#define FSL_DMA_DGSR_CH		0x20
+#define FSL_DMA_DGSR_PE		0x10
+#define FSL_DMA_DGSR_EOLNI	0x08
+#define FSL_DMA_DGSR_CB		0x04
+#define FSL_DMA_DGSR_EOSI	0x02
+#define FSL_DMA_DGSR_EOLSI	0x01
+
+struct fsl_dma_ld_hw {
+	u64 __bitwise	src_addr;
+	u64 __bitwise	dst_addr;
+	u64 __bitwise	next_ln_addr;
+	u32 __bitwise	count;
+	u32 __bitwise	reserve;
+} __attribute__((aligned(32)));
+
+struct fsl_desc_sw {
+	struct fsl_dma_ld_hw hw;
+	struct list_head node;
+	struct dma_async_tx_descriptor async_tx;
+	struct list_head *ld;
+	void *priv;
+} __attribute__((aligned(32)));
+
+struct fsl_dma_chan_regs {
+	u32 __bitwise	mr;	/* 0x00 - Mode Register */
+	u32 __bitwise	sr;	/* 0x04 - Status Register */
+	u64 __bitwise	cdar;	/* 0x08 - Current descriptor address register */
+	u64 __bitwise	sar;	/* 0x10 - Source Address Register */
+	u64 __bitwise	dar;	/* 0x18 - Destination Address Register */
+	u32 __bitwise	bcr;	/* 0x20 - Byte Count Register */
+	u64 __bitwise	ndar;	/* 0x24 - Next Descriptor Address Register */
+};
+
+struct fsl_dma_chan;
+#define FSL_DMA_MAX_CHANS_PER_DEVICE 4
+
+struct fsl_dma_device {
+	void __iomem *reg_base;	/* DGSR register base */
+	struct resource reg;	/* Resource for register */
+	struct device *dev;
+	struct dma_device common;
+	struct fsl_dma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE];
+	u32 feature;		/* The same as DMA channels */
+};
+
+/* Define macros for fsl_dma_chan->feature property */
+#define FSL_DMA_LITTLE_ENDIAN	0x00000000
+#define FSL_DMA_BIG_ENDIAN	0x00000001
+
+#define FSL_DMA_IP_MASK		0x00000ff0
+#define FSL_DMA_IP_85XX		0x00000010
+#define FSL_DMA_IP_83XX		0x00000020
+
+#define FSL_DMA_CHAN_PAUSE_EXT	0x00001000
+#define FSL_DMA_CHAN_START_EXT	0x00002000
+
+struct fsl_dma_chan {
+	struct fsl_dma_chan_regs __iomem *reg_base;
+	dma_cookie_t completed_cookie;	/* The maximum cookie completed */
+	spinlock_t desc_lock;		/* Descriptor operation lock */
+	struct list_head ld_queue;	/* Link descriptors queue */
+	struct dma_chan common;		/* DMA common channel */
+	struct dma_pool *desc_pool;	/* Descriptors pool */
+	struct device *dev;		/* Channel device */
+	struct resource reg;		/* Resource for register */
+	int irq;			/* Channel IRQ */
+	int id;				/* Raw id of this channel */
+	struct tasklet_struct tasklet;
+	u32 feature;
+
+	void (*toggle_ext_pause)(struct fsl_dma_chan *fsl_chan, int size);
+	void (*toggle_ext_start)(struct fsl_dma_chan *fsl_chan, int enable);
+	void (*set_src_loop_size)(struct fsl_dma_chan *fsl_chan, int size);
+	void (*set_dest_loop_size)(struct fsl_dma_chan *fsl_chan, int size);
+};
+
+#define to_fsl_chan(chan) container_of(chan, struct fsl_dma_chan, common)
+#define to_fsl_desc(lh) container_of(lh, struct fsl_desc_sw, node)
+#define tx_to_fsl_desc(tx) container_of(tx, struct fsl_desc_sw, async_tx)
+
+#ifndef __powerpc64__
+static u64 in_be64(const u64 __iomem *addr)
+{
+	return ((u64)in_be32((u32 *)addr) << 32) | (in_be32((u32 *)addr + 1));
+}
+
+static void out_be64(u64 __iomem *addr, u64 val)
+{
+	out_be32((u32 *)addr, val >> 32);
+	out_be32((u32 *)addr + 1, (u32)val);
+}
+
+/* There is no asm instructions for 64 bits reverse loads and stores */
+static u64 in_le64(const u64 __iomem *addr)
+{
+	return ((u64)in_le32((u32 *)addr + 1) << 32) | (in_le32((u32 *)addr));
+}
+
+static void out_le64(u64 __iomem *addr, u64 val)
+{
+	out_le32((u32 *)addr + 1, val >> 32);
+	out_le32((u32 *)addr, (u32)val);
+}
+#endif
+
+#define DMA_IN(fsl_chan, addr, width)					\
+		(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?		\
+			in_be##width(addr) : in_le##width(addr))
+#define DMA_OUT(fsl_chan, addr, val, width)				\
+		(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?		\
+			out_be##width(addr, val) : out_le##width(addr, val))
+
+#define DMA_TO_CPU(fsl_chan, d, width)					\
+		(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?		\
+			be##width##_to_cpu(d) :	le##width##_to_cpu(d))
+#define CPU_TO_DMA(fsl_chan, c, width)					\
+		(((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ?		\
+			cpu_to_be##width(c) : cpu_to_le##width(c))
+
+#endif	/* __DMA_FSLDMA_H */