path: root/target/linux/coldfire/patches/007-Add-eDMA-support-for-MCF5445x.patch

From cd07e01d0c6c207a6138e9d5229dfa8c88ab3879 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:40 +0800
Subject: [PATCH 07/52] Add eDMA support for MCF5445x

Add MCF5445x on-chip eDMA controller driver.

Signed-off-by: Alison Wang <b18965@freescale.com>
---
 arch/m68k/include/asm/mcf_edma.h |  246 +++++++++
 drivers/Makefile                 |    2 +
 drivers/dma/Kconfig              |   15 +
 drivers/dma/Makefile             |    4 +
 drivers/dma/mcf_edma.c           | 1029 ++++++++++++++++++++++++++++++++++++++
 drivers/dma/mcf_edma_test.c      |  276 ++++++++++
 6 files changed, 1572 insertions(+), 0 deletions(-)
 create mode 100644 arch/m68k/include/asm/mcf_edma.h
 create mode 100644 drivers/dma/mcf_edma.c
 create mode 100644 drivers/dma/mcf_edma_test.c

--- /dev/null
+++ b/arch/m68k/include/asm/mcf_edma.h
@@ -0,0 +1,246 @@
+/*
+ * mcf_edma.h - Coldfire eDMA driver header file.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ *  Add support for m5441x platform (Lanttor.Guo@freescale.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.
+ */
+
+#ifndef _MCF_EDMA_H
+#define _MCF_EDMA_H
+
+#include <asm/mcfsim.h>
+#include <linux/interrupt.h>
+#if defined(CONFIG_M5445X)
+#include <asm/mcf5445x_edma.h>
+#elif defined(CONFIG_M5441X)
+#include <asm/mcf5441x_edma.h>
+#endif
+#include <linux/scatterlist.h>
+
+#define MCF_EDMA_INT0_CHANNEL_BASE	(8)
+#define MCF_EDMA_INT0_CONTROLLER_BASE	(64)
+#define MCF_EDMA_INT0_BASE		(MCF_EDMA_INT0_CHANNEL_BASE + \
+					 MCF_EDMA_INT0_CONTROLLER_BASE)
+#define MCF_EDMA_INT0_NUM		(16)
+#define MCF_EDMA_INT0_END		(MCF_EDMA_INT0_NUM)
+
+#if defined(CONFIG_M5441X)
+#define MCF_EDMA_INT1_CHANNEL_BASE	(8)
+#define MCF_EDMA_INT1_CONTROLLER_BASE	(128)
+#define MCF_EDMA_INT1_BASE		(MCF_EDMA_INT1_CHANNEL_BASE + \
+					 MCF_EDMA_INT1_CONTROLLER_BASE)
+#define MCF_EDMA_INT1_NUM		(40)
+#define MCF_EDMA_INT1_END		(MCF_EDMA_INT0_END + MCF_EDMA_INT1_NUM)
+
+#define MCF_EDMA_INT2_CHANNEL_BASE	(0)
+#define MCF_EDMA_INT2_CONTROLLER_BASE	(192)
+#define MCF_EDMA_INT2_BASE		(MCF_EDMA_INT2_CHANNEL_BASE + \
+					 MCF_EDMA_INT2_CONTROLLER_BASE)
+#define MCF_EDMA_INT2_NUM		(8)
+#define MCF_EDMA_INT2_END		(MCF_EDMA_INT1_END + MCF_EDMA_INT2_NUM)
+
+#endif
+
+#if defined(CONFIG_M5445X)
+#define MCF_EDMA_CHANNELS		(16)	/* 0-15 */
+#elif defined(CONFIG_M5441X)
+#define MCF_EDMA_CHANNELS		(64)	/* 0-63 */
+#endif
+
+#define MCF_EDMA_CHANNEL_ANY		(0xFF)
+#define MCF_EDMA_INT_ERR		(16)	/* edma error interrupt */
+
+#define MCF_EDMA_TCD_PER_CHAN		256
+
+#ifdef CONFIG_M54455
+/* eDMA engine TCD memory description */
+
+struct TCD {
+	u32	saddr;
+	u16	attr;
+	u16	soff;
+	u32	nbytes;
+	u32	slast;
+	u32	daddr;
+	u16	citer;
+	u16	doff;
+	u32	dlast_sga;
+	u16	biter;
+	u16	csr;
+} __packed;
+
+struct fsl_edma_requestbuf {
+	dma_addr_t	saddr;
+	dma_addr_t	daddr;
+	u32	soff;
+	u32	doff;
+	u32	attr;
+	u32	 minor_loop;
+	u32	len;
+};
+
+/*
+ * config the eDMA to use the TCD sg feature
+ *
+ * @channel: which channel. in fact this function is designed to satisfy
+ * the ATA driver TCD SG need, i.e. by now it is a special
+ * func, because it need prev alloc channel TCD physical memory
+ * first, we add the ATA's in the eDMA init only
+ * @buf: buffer array to fill the TCDs
+ * @nents: the size of the buf
+ */
+void mcf_edma_sg_config(int channel, struct fsl_edma_requestbuf *buf,
+			int nents);
+
+/*
+ * The zero-copy version of mcf_edma_sg_config()
+ */
+void mcf_edma_sglist_config(int channel, struct scatterlist *sgl, int n_elem,
+			int dma_dir, u32 addr, u32 attr,
+			u32 soff, u32 doff, u32 nbytes);
+#endif
+
+/* Setup transfer control descriptor (TCD)
+ *   channel - descriptor number
+ *   source  - source address
+ *   dest    - destination address
+ *   attr    - attributes
+ *   soff    - source offset
+ *   nbytes  - number of bytes to be transfered in minor loop
+ *   slast   - last source address adjustment
+ *   citer   - major loop count
+ *   biter   - begining minor loop count
+ *   doff    - destination offset
+ *   dlast_sga - last destination address adjustment
+ *   major_int - generate interrupt after each major loop
+ *   disable_req - disable DMA request after major loop
+ */
+void mcf_edma_set_tcd_params(int channel, u32 source, u32 dest,
+			     u32 attr, u32 soff, u32 nbytes, u32 slast,
+			     u32 citer, u32 biter, u32 doff, u32 dlast_sga,
+			     int major_int, int disable_req);
+
+/* Setup transfer control descriptor (TCD) and enable halfway irq
+ *   channel - descriptor number
+ *   source  - source address
+ *   dest    - destination address
+ *   attr    - attributes
+ *   soff    - source offset
+ *   nbytes  - number of bytes to be transfered in minor loop
+ *   slast   - last source address adjustment
+ *   biter   - major loop count
+ *   doff    - destination offset
+ *   dlast_sga - last destination address adjustment
+ *   disable_req - disable DMA request after major loop
+ */
+void mcf_edma_set_tcd_params_halfirq(int channel, u32 source, u32 dest,
+				     u32 attr, u32 soff, u32 nbytes, u32 slast,
+				     u32 biter, u32 doff, u32 dlast_sga,
+				     int disable_req);
+
+/* check if dma is done
+ *   channel - descriptor number
+ *   return 1 if done
+ */
+int mcf_edma_check_done(int channel);
+
+/* Starts eDMA transfer on specified channel
+ *   channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_start_transfer(int channel)
+{
+	MCF_EDMA_SERQ = channel;
+	MCF_EDMA_SSRT = channel;
+}
+
+/* Restart eDMA transfer from halfirq
+ *   channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_confirm_halfirq(int channel)
+{
+	/*MCF_EDMA_TCD_CSR(channel) = 7;*/
+	MCF_EDMA_SSRT = channel;
+}
+
+/* Starts eDMA transfer on specified channel based on peripheral request
+ *   channel - eDMA TCD number
+ */
+static inline void  mcf_edma_enable_transfer(int channel)
+{
+	MCF_EDMA_SERQ = channel;
+}
+
+
+/* Stops eDMA transfer
+ *   channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_stop_transfer(int channel)
+{
+	MCF_EDMA_CINT = channel;
+	MCF_EDMA_CERQ = channel;
+}
+
+/* Confirm that interrupt has been handled
+ *   channel - eDMA TCD number
+ */
+static inline void
+mcf_edma_confirm_interrupt_handled(int channel)
+{
+	MCF_EDMA_CINT = channel;
+}
+
+/**
+ * mcf_edma_request_channel - Request an eDMA channel
+ * @channel: channel number. In case it is equal to EDMA_CHANNEL_ANY
+ *		it will be allocated a first free eDMA channel.
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @irq_level: irq level for the dma handler
+ * @arg: argument to pass back
+ * @lock: optional spinlock to hold over interrupt
+ * @device_id: device id
+ *
+ * Returns allocatedd channel number if success or
+ * a negative value if failure.
+ */
+int mcf_edma_request_channel(int channel,
+			     irqreturn_t(*handler) (int, void *),
+			     void (*error_handler) (int, void *),
+			     u8 irq_level,
+			     void *arg,
+			     spinlock_t *lock, const char *device_id);
+
+/**
+ * Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int mcf_edma_set_callback(int channel,
+			  irqreturn_t(*handler) (int, void *),
+			  void (*error_handler) (int, void *), void *arg);
+
+/**
+ * Free the edma channel
+ * @channel: channel number
+ * @arg: argument created with
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int mcf_edma_free_channel(int channel, void *arg);
+
+void mcf_edma_dump_channel(int channel);
+
+#endif				/* _MCF_EDMA_H */
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_FB_I810)           += video
 obj-$(CONFIG_FB_INTEL)          += video/intelfb/
 
 obj-$(CONFIG_PARPORT)		+= parport/
+obj-$(CONFIG_COLDFIRE_EDMA)       += dma/
 obj-y				+= base/ block/ misc/ mfd/ nfc/
 obj-$(CONFIG_NUBUS)		+= nubus/
 obj-y				+= macintosh/
@@ -114,6 +115,7 @@ obj-$(CONFIG_BCMA)		+= bcma/
 obj-$(CONFIG_VHOST_NET)		+= vhost/
 obj-$(CONFIG_VLYNQ)		+= vlynq/
 obj-$(CONFIG_STAGING)		+= staging/
+obj-$(CONFIG_MCD_DMA)           += dma/
 obj-y				+= platform/
 obj-y				+= ieee802154/
 #common clk code
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -114,6 +114,21 @@ config MPC512X_DMA
 	---help---
 	  Enable support for the Freescale MPC512x built-in DMA engine.
 
+config COLDFIRE_EDMA
+	tristate "Coldfire eDMA support"
+	default y
+	depends on COLDFIRE && (M5445X || M5441X)
+	help
+	  Enable support for Coldfire eDMA controller. For example
+	  used by Coldfire SSI Audio device driver.
+
+config COLDFIRE_EDMA_TEST
+	tristate "Coldfire eDMA simple test module"
+	default m
+	depends on COLDFIRE_EDMA
+	help
+	  This is simple eDMA test module.
+
 config MV_XOR
 	bool "Marvell XOR engine support"
 	depends on PLAT_ORION
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -13,10 +13,14 @@ obj-$(CONFIG_INTEL_IOATDMA) += ioat/
 obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
 obj-$(CONFIG_FSL_DMA) += fsldma.o
 obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
+obj-$(CONFIG_COLDFIRE_EDMA) += mcf_edma.o
+obj-$(CONFIG_COLDFIRE_EDMA_TEST) += mcf_edma_test.o
 obj-$(CONFIG_MV_XOR) += mv_xor.o
 obj-$(CONFIG_DW_DMAC) += dw_dmac.o
 obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
 obj-$(CONFIG_MX3_IPU) += ipu/
+obj-$(CONFIG_MCD_DMA) += mcddma.o
+mcddma-objs := MCD_dmaApi.o MCD_tasks.o MCD_tasksInit.o
 obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
 obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
--- /dev/null
+++ b/drivers/dma/mcf_edma.c
@@ -0,0 +1,1029 @@
+/*
+ * mcf_edma.c - eDMA driver for Coldfire.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Andrey Butok
+ *         Yaroslav Vinogradov
+ *         Lanttor.Guo@freescale.com add  m5441x platform support.
+ *
+ * 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
+ *
+ ***************************************************************************
+ * Changes:
+ *   v0.002    29 February 2008        Andrey Butok, Freescale Semiconductor
+ *             Added support of atomatic channel allocation from the
+ *             channel pool.
+ *   v0.001    12 February 2008                Andrey Butok
+ *             Initial Release - developed on uClinux with 2.6.23 kernel.
+ *             Based on coldfire_edma.c code
+ *             of Yaroslav Vinogradov (Freescale Semiconductor, Inc.)
+ *
+ * NOTE: This driver was tested on MCF52277 platform.
+ *      It should also work on other Coldfire platdorms with eDMA module.
+ *
+ * TBD: Try to make it more general.
+ *     Try to integrate with current <asm/dma.h> <kernel/dma.c> API
+ *     or use Intel DMA API
+ */
+
+#include <linux/dma-mapping.h>
+#include <asm/mcf_edma.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <asm/coldfire.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+/* Please add here processors that were tested with this driver */
+#if !defined(CONFIG_M5227x) && !defined(CONFIG_M5445X) && \
+	!defined(CONFIG_M5441X)
+#error "The driver is not tested/designed for your processor!"
+#endif
+
+#define MCF_EDMA_DRIVER_VERSION	"Revision: 0.003"
+#define MCF_EDMA_DRIVER_AUTHOR	"Freescale Semiconductor Inc, Andrey Butok"
+#define MCF_EDMA_DRIVER_DESC	"Coldfire EDMA driver."
+#define MCF_EDMA_DRIVER_INFO	DRIVER_VERSION " " DRIVER_DESC
+#define MCF_EDMA_DRIVER_LICENSE	"GPL"
+#define MCF_EDMA_DRIVER_NAME	"mcf_edma"
+
+#define MCF_EDMA_DEV_MINOR	(1)
+
+#undef MCF_EDMA_DEBUG
+
+#ifdef MCF_EDMA_DEBUG
+#define DBG(fmt, args...)	printk(KERN_INFO "[%s]  " fmt, \
+				__func__, ## args)
+#else
+#define DBG(fmt, args...)	do {} while (0)
+#endif
+
+#define ERR(format, arg...)	printk(KERN_ERR "%s:%s: " format "\n", \
+				 __FILE__,  __func__ , ## arg)
+#define INFO(stuff...)		printk(KERN_INFO MCF_EDMA_DRIVER_NAME \
+				": " stuff)
+
+/* DMA channel pool used for atomtic channel allocation.
+ * You can edit this list. First candidates are "Not used/Reserved" channels */
+u8 mcf_edma_channel_pool[] = { 1,	/* Not used */
+	0,			/* External DMA request */
+	5,			/* UART1 Receive */
+	6,			/* UART1 Transmit */
+	7,			/* UART2 Receive */
+	8,			/* UART2 Transmit */
+#if defined(CONFIG_M5441X)
+	16,
+	55,
+	56,
+	63,
+#endif
+};
+
+/*
+ * Callback handler data for each TCD
+ */
+struct mcf_edma_isr_record {
+	irqreturn_t(*irq_handler) (int, void *);	/* interrupt handler */
+	void (*error_handler) (int, void *);	/* error interrupt handler */
+	void *arg;		/* argument to pass back */
+	int allocated;		/* busy flag */
+	spinlock_t *lock;	/* spin lock (optional) */
+	const char *device_id;	/* dev id string, used in procfs */
+};
+
+/*
+ * Device structure
+ */
+struct mcf_edma_dev {
+	struct cdev cdev;	/* character device */
+	struct mcf_edma_isr_record dma_interrupt_handlers[MCF_EDMA_CHANNELS];
+};
+
+/* allocated major device number */
+static int mcf_edma_major;
+
+/* device driver structure */
+static struct mcf_edma_dev *mcf_edma_devp;
+
+#ifdef CONFIG_M54455
+/* PATA controller structure */
+static struct {
+	struct TCD *pata_tcd_va;
+	dma_addr_t pata_tcd_pa;
+} fsl_pata_dma_tcd;
+#endif
+
+/* device driver file operations */
+const struct file_operations mcf_edma_fops = {
+	.owner = THIS_MODULE,
+};
+
+/**
+ * mcf_edma_isr - eDMA channel interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
+static irqreturn_t
+mcf_edma_isr(int irq, void *dev_id)
+{
+	int channel = -1;
+	int result = IRQ_HANDLED;
+
+#if defined(CONFIG_M5445X)
+	channel = irq - MCF_EDMA_INT0_BASE;
+#elif defined(CONFIG_M5441X)
+	if (irq >= MCF_EDMA_INT0_BASE &&
+	    irq < MCF_EDMA_INT0_BASE + MCF_EDMA_INT0_NUM)
+		channel = irq - MCF_EDMA_INT0_BASE;
+	else if (irq >= MCF_EDMA_INT1_BASE &&
+		 irq < MCF_EDMA_INT1_BASE + MCF_EDMA_INT1_NUM)
+		channel = irq - MCF_EDMA_INT1_BASE + MCF_EDMA_INT0_END;
+	else if (irq == MCF_EDMA_INT2_BASE &&
+		 irq < MCF_EDMA_INT2_BASE + MCF_EDMA_INT2_NUM) {
+		int i;
+		for (i = 0; i < MCF_EDMA_INT2_NUM; i++) {
+			if ((MCF_EDMA_INTH >> 24) & (0x1 << i)) {
+				channel = irq - MCF_EDMA_INT2_BASE +
+					  MCF_EDMA_INT1_END + i;
+				break;
+			}
+		}
+	} else {
+		ERR("Bad irq number at isr!\n");
+		return result;
+	}
+#endif
+
+	DBG("\n");
+
+	if ((mcf_edma_devp != NULL) &&
+	    (mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler)) {
+		/* call user irq handler */
+		if (mcf_edma_devp->dma_interrupt_handlers[channel].lock)
+			spin_lock(mcf_edma_devp->
+				  dma_interrupt_handlers[channel].lock);
+
+		result =
+		    mcf_edma_devp->dma_interrupt_handlers[channel].
+		    irq_handler(channel,
+				mcf_edma_devp->dma_interrupt_handlers[channel].
+				arg);
+
+		if (mcf_edma_devp->dma_interrupt_handlers[channel].lock)
+			spin_unlock(mcf_edma_devp->
+				    dma_interrupt_handlers[channel].lock);
+	} else {
+		/* no irq handler so just ack it */
+		mcf_edma_confirm_interrupt_handled(channel);
+		ERR(" No handler for DMA channel (%d)\n", channel);
+	}
+
+	return result;
+}
+
+/**
+ * mcf_edma_error_isr - eDMA error interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
+static irqreturn_t
+mcf_edma_error_isr(int irq, void *dev_id)
+{
+	int i;
+
+#if defined(CONFIG_M5445X)
+	u16 err;
+
+	err = MCF_EDMA_ERR;
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		if (err & (1 << i)) {
+			if (mcf_edma_devp != NULL &&
+			    mcf_edma_devp->dma_interrupt_handlers[i].
+			    error_handler)
+				mcf_edma_devp->dma_interrupt_handlers[i].
+				    error_handler(i,
+						  mcf_edma_devp->
+						  dma_interrupt_handlers[i].
+						  arg);
+			else
+				ERR(" DMA error on channel (%d)\n", i);
+		}
+	}
+#elif defined(CONFIG_M5441X)
+	u32 errl, errh;
+
+	errl = MCF_EDMA_ERRL;
+	errh = MCF_EDMA_ERRH;
+
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		if ((errl & (1 << i)) || (errh & (1 << (i - 32)))) {
+			if (mcf_edma_devp != NULL &&
+				mcf_edma_devp->dma_interrupt_handlers[i].
+				error_handler)
+				mcf_edma_devp->dma_interrupt_handlers[i].
+					error_handler(i, mcf_edma_devp->
+						dma_interrupt_handlers[i].arg);
+			else
+				ERR(" DMA error on channel (%d)\n", i);
+		}
+	}
+#endif
+	MCF_EDMA_CERR = MCF_EDMA_CERR_CAER;
+	return IRQ_HANDLED;
+}
+
+/**
+ * mcf_edma_check_done - Check if channel is finished or not
+ * @channel: channel number
+ * return: 0 if not done yet
+ */
+int
+mcf_edma_check_done(int channel)
+{
+	if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+		return 1;
+
+	return MCF_EDMA_TCD_CSR(channel) & MCF_EDMA_TCD_CSR_DONE;
+}
+EXPORT_SYMBOL(mcf_edma_check_done);
+
+/**
+ * mcf_edma_set_tcd_params - Set transfer control descriptor (TCD)
+ * @channel: channel number
+ * @source: source address
+ * @dest: destination address
+ * @attr: attributes
+ * @soff: source offset
+ * @nbytes: number of bytes to be transfered in minor loop
+ * @slast: last source address adjustment
+ * @citer: major loop count
+ * @biter: beginning major loop count
+ * @doff: destination offset
+ * @dlast_sga: last destination address adjustment
+ * @major_int: generate interrupt after each major loop
+ * @disable_req: disable DMA request after major loop
+ */
+void
+mcf_edma_set_tcd_params(int channel, u32 source, u32 dest,
+			u32 attr, u32 soff, u32 nbytes, u32 slast,
+			u32 citer, u32 biter, u32 doff, u32 dlast_sga,
+			int major_int, int disable_req)
+{
+	DBG("(%d)\n", channel);
+
+	if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+		return;
+
+	MCF_EDMA_TCD_SADDR(channel) = source;
+	MCF_EDMA_TCD_DADDR(channel) = dest;
+	MCF_EDMA_TCD_ATTR(channel) = attr;
+	MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(soff);
+	MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(nbytes);
+	MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(slast);
+	MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(citer);
+	MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(biter);
+	MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(doff);
+	MCF_EDMA_TCD_DLAST_SGA(channel) =
+	    MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga);
+	MCF_EDMA_TCD_CSR(channel) = 0x0000;
+
+	/* interrupt at the end of major loop */
+	if (major_int)
+		MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_INT_MAJOR;
+	else
+		MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_INT_MAJOR;
+
+	/* disable request at the end of major loop of transfer or not */
+	if (disable_req)
+		MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_D_REQ;
+	else
+		MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_D_REQ;
+
+	/* enable error interrupt */
+	MCF_EDMA_SEEI = MCF_EDMA_SEEI_SEEI(channel);
+}
+EXPORT_SYMBOL(mcf_edma_set_tcd_params);
+#ifdef CONFIG_M54455
+/**
+ * mcf_edma_sg_config - config an eDMA channel to use the S/G tcd feature
+ * @channel: channel number
+ * @buf: the array of tcd sg
+ * @nents: number of tcd sg array, the max is 256 set but can modify
+ *
+ * limitation:
+ *	currently this function is only for PATA RX/TX on MCF54455,
+ *	so eDMA init does not allocate TCD memory for other memory
+ *
+ * TODO:
+ *	any one who need this feature shoule add his own TCD memory init
+ */
+void mcf_edma_sg_config(int channel, struct fsl_edma_requestbuf *buf,
+			int nents)
+{
+	struct TCD *vtcd = (struct TCD *)fsl_pata_dma_tcd.pata_tcd_va;
+	u32 ptcd = fsl_pata_dma_tcd.pata_tcd_pa;
+	struct fsl_edma_requestbuf *pb = buf;
+	int i;
+
+	if (channel < MCF_EDMA_CHAN_ATA_RX || channel > MCF_EDMA_CHAN_ATA_TX) {
+		printk(KERN_ERR "mcf edma sg config err, not support\n");
+		return;
+	}
+	if (nents > MCF_EDMA_TCD_PER_CHAN) {
+		printk(KERN_ERR "Too many SGs, please confirm.%d > %d\n",
+				nents, MCF_EDMA_TCD_PER_CHAN);
+		return;
+	}
+
+	/* build our tcd sg array */
+	for (i = 0; i < nents; i++) {
+		memset(vtcd, 0 , sizeof(struct TCD));
+		vtcd->saddr = pb->saddr;
+		vtcd->daddr = pb->daddr;
+		vtcd->attr = pb->attr;
+		vtcd->soff = pb->soff;
+		vtcd->doff = pb->doff;
+		vtcd->nbytes = pb->minor_loop;
+		vtcd->citer = vtcd->biter = pb->len/pb->minor_loop;
+
+		if (i != nents - 1) {
+			vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;/* we are tcd sg */
+			vtcd->dlast_sga =
+				(u32)(ptcd + (i + 1)*sizeof(struct TCD));
+		} else {
+			/*this is the last sg, so enable the major int*/
+			vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+					|MCF_EDMA_TCD_CSR_D_REQ;
+		}
+		pb++;
+		vtcd++;
+	}
+
+	/* Now setup the firset TCD for this sg to the edma enginee */
+	vtcd = fsl_pata_dma_tcd.pata_tcd_va;
+
+	MCF_EDMA_TCD_CSR(channel) = 0x0000;
+	MCF_EDMA_TCD_SADDR(channel) = vtcd->saddr;
+	MCF_EDMA_TCD_DADDR(channel) = vtcd->daddr;
+	MCF_EDMA_TCD_ATTR(channel) = vtcd->attr;
+	MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(vtcd->soff);
+	MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(vtcd->nbytes);
+	MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(vtcd->slast);
+	MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(vtcd->citer);
+	MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(vtcd->biter);
+	MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(vtcd->doff);
+	MCF_EDMA_TCD_DLAST_SGA(channel) =
+	    MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(vtcd->dlast_sga);
+	MCF_EDMA_TCD_CSR(channel) |= vtcd->csr;
+}
+EXPORT_SYMBOL(mcf_edma_sg_config);
+
+/**
+ * The zero-copy version of mcf_edma_sg_config
+ * dma_dir : indicate teh addr direction
+ */
+void mcf_edma_sglist_config(int channel, struct scatterlist *sgl, int n_elem,
+			int dma_dir, u32 addr, u32 attr,
+			u32 soff, u32 doff, u32 nbytes)
+{
+	struct TCD *vtcd = (struct TCD *)fsl_pata_dma_tcd.pata_tcd_va;
+	u32 ptcd = fsl_pata_dma_tcd.pata_tcd_pa;
+	struct scatterlist *sg;
+	u32 si;
+
+	if (channel < MCF_EDMA_CHAN_ATA_RX || channel > MCF_EDMA_CHAN_ATA_TX) {
+		printk(KERN_ERR "mcf edma sg config err, not support\n");
+		return;
+	}
+	if (n_elem > MCF_EDMA_TCD_PER_CHAN) {
+		printk(KERN_ERR "Too many SGs, please confirm.%d > %d\n",
+				n_elem, MCF_EDMA_TCD_PER_CHAN);
+		return;
+	}
+
+	/* build our tcd sg array */
+	if (dma_dir == DMA_TO_DEVICE) {	/* write */
+		for_each_sg(sgl, sg, n_elem, si) {
+			memset(vtcd, 0 , sizeof(struct TCD));
+			vtcd->saddr = sg_dma_address(sg);
+			vtcd->daddr = addr;
+			vtcd->attr = attr;
+			vtcd->soff = soff;
+			vtcd->doff = doff;
+			vtcd->nbytes = nbytes;
+			vtcd->citer = vtcd->biter = sg_dma_len(sg)/nbytes;
+
+			if (si != n_elem - 1) {
+				/* we are tcd sg */
+				vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;
+				vtcd->dlast_sga = (u32)(ptcd + (si + 1) * \
+							sizeof(struct TCD));
+			} else {
+				/*this is the last sg, so enable the major int*/
+				vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+					|MCF_EDMA_TCD_CSR_D_REQ;
+			}
+			vtcd++;
+		}
+	} else {
+		for_each_sg(sgl, sg, n_elem, si) {
+			memset(vtcd, 0 , sizeof(struct TCD));
+			vtcd->daddr = sg_dma_address(sg);
+			vtcd->saddr = addr;
+			vtcd->attr = attr;
+			vtcd->soff = soff;
+			vtcd->doff = doff;
+			vtcd->nbytes = nbytes;
+			vtcd->citer = vtcd->biter = sg_dma_len(sg)/nbytes;
+
+			if (si != n_elem - 1) {
+				/* we are tcd sg */
+				vtcd->csr |= MCF_EDMA_TCD_CSR_E_SG;
+				vtcd->dlast_sga = (u32)(ptcd + (si + 1) * \
+							sizeof(struct TCD));
+			} else {
+				/*this is the last sg, so enable the major int*/
+				vtcd->csr |= MCF_EDMA_TCD_CSR_INT_MAJOR
+					|MCF_EDMA_TCD_CSR_D_REQ;
+			}
+			vtcd++;
+		}
+	}
+
+	/* Now setup the firset TCD for this sg to the edma enginee */
+	vtcd = fsl_pata_dma_tcd.pata_tcd_va;
+
+	MCF_EDMA_TCD_CSR(channel) = 0x0000;
+	MCF_EDMA_TCD_SADDR(channel) = vtcd->saddr;
+	MCF_EDMA_TCD_DADDR(channel) = vtcd->daddr;
+	MCF_EDMA_TCD_ATTR(channel) = vtcd->attr;
+	MCF_EDMA_TCD_SOFF(channel) = MCF_EDMA_TCD_SOFF_SOFF(vtcd->soff);
+	MCF_EDMA_TCD_NBYTES(channel) = MCF_EDMA_TCD_NBYTES_NBYTES(vtcd->nbytes);
+	MCF_EDMA_TCD_SLAST(channel) = MCF_EDMA_TCD_SLAST_SLAST(vtcd->slast);
+	MCF_EDMA_TCD_CITER(channel) = MCF_EDMA_TCD_CITER_CITER(vtcd->citer);
+	MCF_EDMA_TCD_BITER(channel) = MCF_EDMA_TCD_BITER_BITER(vtcd->biter);
+	MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(vtcd->doff);
+	MCF_EDMA_TCD_DLAST_SGA(channel) =
+	    MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(vtcd->dlast_sga);
+
+	MCF_EDMA_TCD_CSR(channel) |= vtcd->csr;
+}
+EXPORT_SYMBOL(mcf_edma_sglist_config);
+#endif
+/**
+ * mcf_edma_set_tcd_params_halfirq - Set TCD AND enable half irq
+ * @channel: channel number
+ * @source: source address
+ * @dest: destination address
+ * @attr: attributes
+ * @soff: source offset
+ * @nbytes: number of bytes to be transfered in minor loop
+ * @slast: last source address adjustment
+ * @biter: beginning major loop count
+ * @doff: destination offset
+ * @dlast_sga: last destination address adjustment
+ * @disable_req: disable DMA request after major loop
+ */
+void
+mcf_edma_set_tcd_params_halfirq(int channel, u32 source, u32 dest,
+				u32 attr, u32 soff, u32 nbytes, u32 slast,
+				u32 biter, u32 doff, u32 dlast_sga,
+				int disable_req)
+{
+	DBG("(%d)\n", channel);
+
+	if (channel < 0 || channel > MCF_EDMA_CHANNELS)
+		return;
+
+	mcf_edma_set_tcd_params(channel, source, dest,
+				attr, soff, nbytes, slast,
+				biter, biter, doff, dlast_sga,
+				1/*0*/, disable_req);
+
+	if (biter < 2)
+		printk(KERN_ERR "MCF_EDMA: Request for halfway irq denied\n");
+
+	/* interrupt midway through major loop */
+	MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_INT_HALF;
+}
+EXPORT_SYMBOL(mcf_edma_set_tcd_params_halfirq);
+
+/**
+ * mcf_edma_request_channel - Request an eDMA channel
+ * @channel: channel number. In case it is equal to EDMA_CHANNEL_ANY
+ *		it will be allocated a first free eDMA channel.
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @irq_level: irq level for the dma handler
+ * @arg: argument to pass back
+ * @lock: optional spinlock to hold over interrupt
+ * @device_id: device id
+ *
+ * Returns allocatedd channel number if success or
+ * a negative value if failure.
+ */
+int
+mcf_edma_request_channel(int channel,
+			 irqreturn_t(*handler) (int, void *),
+			 void (*error_handler) (int, void *),
+			 u8 irq_level,
+			 void *arg, spinlock_t *lock, const char *device_id)
+{
+	DBG("\n channel=%d\n", channel);
+
+	if (mcf_edma_devp != NULL
+	    && ((channel >= 0 && channel <= MCF_EDMA_CHANNELS)
+		|| (channel == MCF_EDMA_CHANNEL_ANY))) {
+		if (channel == MCF_EDMA_CHANNEL_ANY) {
+			int i;
+			for (i = 0; i < sizeof(mcf_edma_channel_pool); i++) {
+				if (mcf_edma_devp->dma_interrupt_handlers
+				    [mcf_edma_channel_pool[i]].allocated ==
+				    0) {
+					channel = mcf_edma_channel_pool[i];
+					break;
+				}
+			};
+			if (channel == MCF_EDMA_CHANNEL_ANY)
+				return -EBUSY;
+		} else {
+			if (mcf_edma_devp->dma_interrupt_handlers[channel].
+			    allocated)
+				return -EBUSY;
+		}
+
+		mcf_edma_devp->dma_interrupt_handlers[channel].allocated = 1;
+		mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler =
+		    handler;
+		mcf_edma_devp->dma_interrupt_handlers[channel].error_handler =
+		    error_handler;
+		mcf_edma_devp->dma_interrupt_handlers[channel].arg = arg;
+		mcf_edma_devp->dma_interrupt_handlers[channel].lock = lock;
+		mcf_edma_devp->dma_interrupt_handlers[channel].device_id =
+		    device_id;
+
+		/* Initalize interrupt controller to allow eDMA interrupts */
+#if defined(CONFIG_M5445X)
+		MCF_INTC0_ICR(MCF_EDMA_INT0_CHANNEL_BASE + channel) = irq_level;
+		MCF_INTC0_CIMR = MCF_EDMA_INT0_CHANNEL_BASE + channel;
+#elif defined(CONFIG_M5441X)
+		if (channel >= 0 && channel < MCF_EDMA_INT0_END) {
+			MCF_INTC0_ICR(MCF_EDMA_INT0_CHANNEL_BASE + channel) =
+				irq_level;
+			MCF_INTC0_CIMR = MCF_EDMA_INT0_CHANNEL_BASE + channel;
+		} else if (channel >= MCF_EDMA_INT0_END &&
+			   channel < MCF_EDMA_INT1_END) {
+			MCF_INTC1_ICR(MCF_EDMA_INT1_CHANNEL_BASE +
+				(channel - MCF_EDMA_INT0_END)) = irq_level;
+			MCF_INTC1_CIMR = MCF_EDMA_INT1_CHANNEL_BASE +
+				(channel - MCF_EDMA_INT0_END);
+		} else if (channel >= MCF_EDMA_INT1_END &&
+			   channel < MCF_EDMA_INT2_END) {
+			MCF_INTC2_ICR(MCF_EDMA_INT2_CHANNEL_BASE) = irq_level;
+			MCF_INTC2_CIMR = MCF_EDMA_INT2_CHANNEL_BASE;
+		} else
+			ERR("Bad channel number!\n");
+#endif
+		return channel;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_request_channel);
+
+/**
+ * mcf_edma_set_callback - Update the channel callback/arg
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int
+mcf_edma_set_callback(int channel,
+		      irqreturn_t(*handler) (int, void *),
+		      void (*error_handler) (int, void *), void *arg)
+{
+	DBG("\n");
+
+	if (mcf_edma_devp != NULL && channel >= 0
+	    && channel <= MCF_EDMA_CHANNELS
+	    && mcf_edma_devp->dma_interrupt_handlers[channel].allocated) {
+		mcf_edma_devp->dma_interrupt_handlers[channel].irq_handler =
+		    handler;
+		mcf_edma_devp->dma_interrupt_handlers[channel].error_handler =
+		    error_handler;
+		mcf_edma_devp->dma_interrupt_handlers[channel].arg = arg;
+		return 0;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_set_callback);
+
+/**
+ * mcf_edma_free_channel - Free the edma channel
+ * @channel: channel number
+ * @arg: argument created with
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int
+mcf_edma_free_channel(int channel, void *arg)
+{
+	DBG("\n");
+
+	if (mcf_edma_devp != NULL && channel >= 0
+	    && channel <= MCF_EDMA_CHANNELS) {
+		if (mcf_edma_devp->dma_interrupt_handlers[channel].allocated) {
+#if 1
+			if (mcf_edma_devp->dma_interrupt_handlers[channel].
+			    arg != arg)
+				return -EBUSY;
+#endif
+
+			mcf_edma_devp->dma_interrupt_handlers[channel].
+			    allocated = 0;
+			mcf_edma_devp->dma_interrupt_handlers[channel].arg =
+			    NULL;
+			mcf_edma_devp->dma_interrupt_handlers[channel].
+			    irq_handler = NULL;
+			mcf_edma_devp->dma_interrupt_handlers[channel].
+			    error_handler = NULL;
+			mcf_edma_devp->dma_interrupt_handlers[channel].lock =
+			    NULL;
+		}
+
+		/* make sure error interrupt is disabled */
+		MCF_EDMA_CEEI = MCF_EDMA_CEEI_CEEI(channel);
+
+		return 0;
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mcf_edma_free_channel);
+
+/**
+ * mcf_edma_cleanup - cleanup driver allocated resources
+ */
+static void
+mcf_edma_cleanup(void)
+{
+	dev_t devno;
+	int i;
+
+	DBG("\n");
+
+	/* disable all error ints */
+	MCF_EDMA_CEEI = MCF_EDMA_CEEI_CAEE;
+
+	/* free interrupts/memory */
+	if (mcf_edma_devp) {
+		for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		#if defined(CONFIG_M5445X)
+			free_irq(MCF_EDMA_INT0_BASE + i, mcf_edma_devp);
+		#elif defined(CONFIG_M5441X)
+			if (i >= 0 && i < MCF_EDMA_INT0_END)
+				free_irq(MCF_EDMA_INT0_BASE + i, mcf_edma_devp);
+			else if (i >= MCF_EDMA_INT0_END &&
+				 i <= MCF_EDMA_INT1_END)
+				free_irq(MCF_EDMA_INT1_BASE +
+				 (i - MCF_EDMA_INT0_END), mcf_edma_devp);
+			else if (i >= MCF_EDMA_INT1_END &&
+				 i < MCF_EDMA_INT2_END) {
+				free_irq(MCF_EDMA_INT2_BASE, mcf_edma_devp);
+				break;
+			} else {
+				ERR("Bad irq number!\n");
+				return;
+			}
+		#endif
+		}
+
+		free_irq(MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR, mcf_edma_devp);
+		cdev_del(&mcf_edma_devp->cdev);
+		kfree(mcf_edma_devp);
+	}
+
+	/* unregister character device */
+	devno = MKDEV(mcf_edma_major, 0);
+	unregister_chrdev_region(devno, 1);
+}
+
+/**
+ * mcf_edma_dump_channel - dump a channel information
+ */
+void
+mcf_edma_dump_channel(int channel)
+{
+	printk(KERN_DEBUG "EDMA Channel %d\n", channel);
+	printk(KERN_DEBUG "  TCD Base     = 0x%x\n",
+	       (int)&MCF_EDMA_TCD_SADDR(channel));
+	printk(KERN_DEBUG "  SRCADDR      = 0x%lx\n",
+	       MCF_EDMA_TCD_SADDR(channel));
+	printk(KERN_DEBUG "  SRCOFF       = 0x%x\n",
+	       MCF_EDMA_TCD_SOFF(channel));
+	printk(KERN_DEBUG "  XFR ATTRIB   = 0x%x\n",
+	       MCF_EDMA_TCD_ATTR(channel));
+	printk(KERN_DEBUG "  SRCLAST      = 0x%lx\n",
+	       MCF_EDMA_TCD_SLAST(channel));
+	printk(KERN_DEBUG "  DSTADDR      = 0x%lx\n",
+	       MCF_EDMA_TCD_DADDR(channel));
+	printk(KERN_DEBUG "  MINOR BCNT   = 0x%lx\n",
+	       MCF_EDMA_TCD_NBYTES(channel));
+	printk(KERN_DEBUG "  CUR_LOOP_CNT = 0x%x\n",
+	       MCF_EDMA_TCD_CITER(channel)&0x1ff);
+	printk(KERN_DEBUG "  BEG_LOOP_CNT = 0x%x\n",
+	       MCF_EDMA_TCD_BITER(channel)&0x1ff);
+	printk(KERN_DEBUG "  STATUS       = 0x%x\n",
+	       MCF_EDMA_TCD_CSR(channel));
+
+}
+EXPORT_SYMBOL(mcf_edma_dump_channel);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * proc file system support
+ */
+
+#define FREE_CHANNEL "free"
+#define DEVICE_UNKNOWN "device unknown"
+
+/**
+ * mcf_edma_proc_show - print out proc info
+ * @m: seq_file
+ * @v:
+ */
+static int
+mcf_edma_proc_show(struct seq_file *m, void *v)
+{
+	int i;
+
+	if (mcf_edma_devp == NULL)
+		return 0;
+
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		if (mcf_edma_devp->dma_interrupt_handlers[i].allocated) {
+			if (mcf_edma_devp->dma_interrupt_handlers[i].device_id)
+				seq_printf(m, "%2d: %s\n", i,
+					   mcf_edma_devp->
+					   dma_interrupt_handlers[i].
+					   device_id);
+			else
+				seq_printf(m, "%2d: %s\n", i, DEVICE_UNKNOWN);
+		} else
+			seq_printf(m, "%2d: %s\n", i, FREE_CHANNEL);
+	}
+	return 0;
+}
+
+/**
+ * mcf_edma_proc_open - open the proc file
+ * @inode: inode ptr
+ * @file: file ptr
+ */
+static int
+mcf_edma_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mcf_edma_proc_show, NULL);
+}
+
+static const struct file_operations mcf_edma_proc_operations = {
+	.open = mcf_edma_proc_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+/**
+ * mcf_edma_proc_init - initialize proc filesystem
+ */
+static int __init
+mcf_edma_proc_init(void)
+{
+	struct proc_dir_entry *e;
+
+	e = create_proc_entry("edma", 0, NULL);
+	if (e)
+		e->proc_fops = &mcf_edma_proc_operations;
+
+	return 0;
+}
+
+#endif
+
+/**
+ * mcf_edma_init - eDMA module init
+ */
+static int __init
+mcf_edma_init(void)
+{
+	dev_t dev;
+	int result;
+	int i;
+#ifdef CONFIG_M54455
+	u32 offset;
+#endif
+
+#if defined(CONFIG_M5441X)
+	/* edma group priority, default grp0 > grp1 > grp2 > grp3 */
+	u32 grp0_pri = MCF_EDMA_CR_GRP0PRI(0x00);
+	u32 grp1_pri = MCF_EDMA_CR_GRP1PRI(0x01);
+	u32 grp2_pri = MCF_EDMA_CR_GRP2PRI(0x02);
+	u32 grp3_pri = MCF_EDMA_CR_GRP3PRI(0x03);
+#endif
+
+	DBG("Entry\n");
+
+	/* allocate free major number */
+	result =
+	    alloc_chrdev_region(&dev, MCF_EDMA_DEV_MINOR, 1,
+				MCF_EDMA_DRIVER_NAME);
+	if (result < 0) {
+		ERR("Error %d can't get major number.\n", result);
+		return result;
+	}
+	mcf_edma_major = MAJOR(dev);
+
+	/* allocate device driver structure */
+	mcf_edma_devp = kmalloc(sizeof(struct mcf_edma_dev), GFP_KERNEL);
+	if (!mcf_edma_devp) {
+		result = -ENOMEM;
+		goto fail;
+	}
+
+	/* init handlers (no handlers for beginning) */
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		mcf_edma_devp->dma_interrupt_handlers[i].irq_handler = NULL;
+		mcf_edma_devp->dma_interrupt_handlers[i].error_handler = NULL;
+		mcf_edma_devp->dma_interrupt_handlers[i].arg = NULL;
+		mcf_edma_devp->dma_interrupt_handlers[i].allocated = 0;
+		mcf_edma_devp->dma_interrupt_handlers[i].lock = NULL;
+		mcf_edma_devp->dma_interrupt_handlers[i].device_id = NULL;
+		MCF_EDMA_TCD_CSR(i) = 0x0000;
+	}
+
+	/* register char device */
+	cdev_init(&mcf_edma_devp->cdev, &mcf_edma_fops);
+	mcf_edma_devp->cdev.owner = THIS_MODULE;
+	mcf_edma_devp->cdev.ops = &mcf_edma_fops;
+	result = cdev_add(&mcf_edma_devp->cdev, dev, 1);
+	if (result) {
+		ERR("Error %d adding coldfire-dma device.\n", result);
+		result = -ENODEV;
+		goto fail;
+	}
+
+	/* request/enable irq for each eDMA channel */
+#if defined(CONFIG_M5445X)
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		result = request_irq(MCF_EDMA_INT0_BASE + i,
+				     mcf_edma_isr, IRQF_DISABLED,
+				     MCF_EDMA_DRIVER_NAME, mcf_edma_devp);
+		if (result) {
+			ERR("Cannot request irq %d\n",
+			     (MCF_EDMA_INT0_BASE + i));
+			result = -EBUSY;
+			goto fail;
+		}
+	}
+#elif defined(CONFIG_M5441X)
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		if (i >= 0 && i < MCF_EDMA_INT0_END) {
+			result = request_irq(MCF_EDMA_INT0_BASE + i,
+					     mcf_edma_isr, IRQF_DISABLED,
+					     MCF_EDMA_DRIVER_NAME,
+					     mcf_edma_devp);
+
+			if (result) {
+				ERR("Cannot request irq %d\n",
+				     (MCF_EDMA_INT0_BASE + i));
+				result = -EBUSY;
+				goto fail;
+			}
+		} else if (i >= MCF_EDMA_INT0_END && i < MCF_EDMA_INT1_END) {
+			result = request_irq(MCF_EDMA_INT1_BASE +
+					     (i - MCF_EDMA_INT0_END),
+					     mcf_edma_isr, IRQF_DISABLED,
+					     MCF_EDMA_DRIVER_NAME,
+					     mcf_edma_devp);
+
+			if (result) {
+				ERR("Cannot request irq %d\n",
+				    (MCF_EDMA_INT1_BASE +
+				    (i - MCF_EDMA_INT0_END)));
+				result = -EBUSY;
+				goto fail;
+			}
+		} else if (i >= MCF_EDMA_INT1_END && MCF_EDMA_INT2_END) {
+			result = request_irq(MCF_EDMA_INT2_BASE,
+					     mcf_edma_isr, IRQF_DISABLED,
+					     MCF_EDMA_DRIVER_NAME,
+					     mcf_edma_devp);
+			if (result) {
+				ERR("Cannot request irq %d\n",
+				    MCF_EDMA_INT2_BASE);
+				result = -EBUSY;
+				goto fail;
+			}
+			break;
+		} else {
+			ERR(" Cannot request irq because of wrong number!\n");
+			result = -EBUSY;
+			goto fail;
+		}
+	}
+#endif
+
+	/* request error interrupt */
+	result = request_irq(MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR,
+			     mcf_edma_error_isr, IRQF_DISABLED,
+			     MCF_EDMA_DRIVER_NAME, mcf_edma_devp);
+	if (result) {
+		ERR("Cannot request irq %d\n",
+		    (MCF_EDMA_INT0_BASE + MCF_EDMA_INT_ERR));
+		result = -EBUSY;
+		goto fail;
+	}
+
+#if defined(CONFIG_M5445X)
+	MCF_EDMA_CR = 0;
+#elif defined(CONFIG_M5441X)
+	MCF_EDMA_CR = (0 | grp0_pri | grp1_pri | grp2_pri | grp3_pri);
+	DBG("MCF_EDMA_CR = %lx\n", MCF_EDMA_CR);
+#endif
+
+#ifdef CONFIG_M54455
+	fsl_pata_dma_tcd.pata_tcd_va = (struct TCD *) dma_alloc_coherent(NULL,
+			MCF_EDMA_TCD_PER_CHAN + 1,
+			&fsl_pata_dma_tcd.pata_tcd_pa,
+			GFP_KERNEL);
+
+	if (!fsl_pata_dma_tcd.pata_tcd_va) {
+		printk(KERN_INFO "MCF eDMA alllocate tcd memeory failed\n");
+		goto fail;
+	}
+
+
+	offset = (fsl_pata_dma_tcd.pata_tcd_pa & (sizeof(struct TCD)-1)) ;
+	if (offset) {
+		/*
+		 * up align the addr to 32B to match the eDMA enginee require,
+		 * ie. sizeof tcd boundary
+		 * */
+		printk(KERN_INFO "pata tcd original:pa-%x[%x]\n",
+				fsl_pata_dma_tcd.pata_tcd_pa,
+				(u32)fsl_pata_dma_tcd.pata_tcd_va);
+
+		fsl_pata_dma_tcd.pata_tcd_pa += sizeof(struct TCD) - offset;
+		fsl_pata_dma_tcd.pata_tcd_va += sizeof(struct TCD) - offset;
+
+		printk(KERN_INFO "pata tcd realigned:pa-%x[%x]\n",
+				fsl_pata_dma_tcd.pata_tcd_pa,
+				(u32)fsl_pata_dma_tcd.pata_tcd_va);
+	}
+#endif
+#ifdef CONFIG_PROC_FS
+	mcf_edma_proc_init();
+#endif
+
+	INFO("Initialized successfully\n");
+	return 0;
+fail:
+	mcf_edma_cleanup();
+	return result;
+}
+
+/**
+ * mcf_edma_exit - eDMA module exit
+ */
+static void __exit
+mcf_edma_exit(void)
+{
+	mcf_edma_cleanup();
+}
+
+#ifdef CONFIG_COLDFIRE_EDMA_MODULE
+module_init(mcf_edma_init);
+module_exit(mcf_edma_exit);
+#else
+/* get us in early */
+postcore_initcall(mcf_edma_init);
+#endif
+
+MODULE_DESCRIPTION(MCF_EDMA_DRIVER_INFO);
+MODULE_AUTHOR(MCF_EDMA_DRIVER_AUTHOR);
+MODULE_LICENSE(MCF_EDMA_DRIVER_LICENSE);
--- /dev/null
+++ b/drivers/dma/mcf_edma_test.c
@@ -0,0 +1,276 @@
+/*
+ * mcf_edma_test.c - simple test/example module for Coldfire eDMA.
+ *
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Andrey Butok
+ *
+ * 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
+ *
+ ***************************************************************************
+ * Changes:
+ *   v0.001    29 February 2008                Andrey Butok
+ *             Initial Release
+ *
+ * NOTE:       This module tests eDMA driver performing
+ *             a simple memory to memory transfer with a 32 bit
+ *             source and destination transfer size that generates
+ *             an interrupt when the transfer is complete.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <asm/mcfsim.h>
+#include <asm/coldfire.h>
+#include <asm/mcf_edma.h>
+#include <asm/cacheflush.h>
+
+#define MCF_EDMA_TEST_DRIVER_VERSION	"Revision: 0.001"
+#define MCF_EDMA_TEST_DRIVER_AUTHOR	\
+		"Freescale Semiconductor Inc, Andrey Butok"
+#define MCF_EDMA_TEST_DRIVER_DESC	\
+		"Simple testing module for Coldfire eDMA "
+#define MCF_EDMA_TEST_DRIVER_INFO	\
+		MCF_EDMA_TEST_DRIVER_VERSION " " MCF_EDMA_TEST_DRIVER_DESC
+#define MCF_EDMA_TEST_DRIVER_LICENSE	"GPL"
+#define MCF_EDMA_TEST_DRIVER_NAME	"mcf_edma_test"
+
+#ifndef TRUE
+#define TRUE  1
+#define FALSE 0
+#endif
+
+#define TEST_HALFIRQ
+
+/* Global variable used to signal main process when interrupt is recognized */
+static volatile int mcf_edma_test_interrupt;
+volatile int *mcf_edma_test_interrupt_p =
+				(volatile int *) &mcf_edma_test_interrupt;
+
+/********************************************************************/
+static irqreturn_t
+mcf_edma_test_handler(int channel, void *dev_id)
+{
+	int done = mcf_edma_check_done(channel);
+
+	/* Clear interrupt flag */
+	mcf_edma_confirm_interrupt_handled(channel);
+
+	if (done) {
+		printk(KERN_INFO "DMA Finished\n");
+
+		/* Set interrupt status flag to TRUE */
+		mcf_edma_test_interrupt = TRUE;
+	} else {
+		printk(KERN_INFO "DMA Halfway Done\n");
+
+		/* restart DMA. */
+		mcf_edma_confirm_halfirq(channel);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void
+mcf_edma_test_error_handler(int channel, void *dev_id)
+{
+	printk(KERN_INFO "DMA ERROR: Channel = %d\n", channel);
+	printk(KERN_INFO "           EDMA_ES = 0x%lx\n", (MCF_EDMA_ES));
+	mcf_edma_dump_channel(channel);
+}
+
+/********************************************************************/
+
+int
+mcf_edma_test_block_compare(u8 *block1, u8 *block2, u32 size)
+{
+	u32 i;
+
+	for (i = 0; i < (size); i++) {
+		if ((*(u8 *) (block1 + i)) != (*(u8 *) (block2 + i))) {
+			printk(KERN_INFO "Data Mismatch index=0x%x len=0x%x "
+			       "block1=0x%p  block2=0x%p\n",
+			       i, size, block1, block2);
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}
+
+/********************************************************************/
+
+void
+mcf_edma_test_run(void)
+{
+	u16 byte_count;
+	u32 i, j;
+	u8 *start_address;
+	u8 *dest_address;
+	u32 test_data;
+	int channel;
+	u32 allocated_channels_low = 0;
+	u32 allocated_channels_high = 0;
+
+	printk(KERN_INFO "\n===============================================\n");
+	printk(KERN_INFO "\nStarting eDMA transfer test!\n");
+
+	/* Initialize test variables */
+	byte_count = 0x2000;
+	test_data = 0xA5A5A5A5;
+
+	/* DMA buffer must be from GFP_DMA zone, so it will not be cached */
+	start_address = kmalloc(byte_count, GFP_DMA);
+	if (start_address == NULL) {
+		printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
+		       ": failed to allocate DMA[%d] buffer\n", byte_count);
+		goto err_out;
+	}
+	dest_address = kmalloc(byte_count, /*GFP_KERNEL*/GFP_DMA);
+	if (dest_address == NULL) {
+		printk(KERN_INFO MCF_EDMA_TEST_DRIVER_NAME
+		       ": failed to allocate DMA[%d] buffer\n", byte_count);
+		goto err_free_mem;
+	}
+
+	/* Test all automatically allocated DMA channels. The test data is
+	 * complemented at the end of the loop, so that the testData value
+	 * isn't the same twice in a row */
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		/* request eDMA channel */
+		channel = mcf_edma_request_channel(MCF_EDMA_CHANNEL_ANY,
+						mcf_edma_test_handler,
+						mcf_edma_test_error_handler,
+						0x6,
+						NULL,
+						NULL,
+						MCF_EDMA_TEST_DRIVER_NAME);
+		if (channel < 0)
+			goto test_end;
+
+
+		if (channel >= 0 && channel < 32)
+			allocated_channels_low |= (1 << channel);
+		else if (channel >= 32 && channel < 64)
+			allocated_channels_high |= (1 << (channel - 32));
+
+		/* Initialize data for DMA to move */
+		for (j = 0; j < byte_count; j = j + 4) {
+			*((u32 *) (start_address + j)) = test_data;
+			*((u32 *) (dest_address + j)) = ~test_data;
+		}
+
+		/* Clear interrupt status indicator */
+		mcf_edma_test_interrupt = FALSE;
+
+		/* Configure DMA Channel TCD */
+#ifndef TEST_HALFIRQ
+		/* regular irq on completion */
+		mcf_edma_set_tcd_params(channel,
+					(u32)virt_to_phys(start_address),
+					(u32)virt_to_phys(dest_address),
+					(0 | MCF_EDMA_TCD_ATTR_SSIZE_32BIT |
+					 MCF_EDMA_TCD_ATTR_DSIZE_32BIT), 0x04,
+					byte_count, 0x0, 1, 1, 0x04, 0x0, 0x1,
+					0x0);
+#else
+		/* half completion irq */
+		mcf_edma_set_tcd_params_halfirq(channel,
+					       (u32)virt_to_phys(start_address),
+					       (u32)virt_to_phys(dest_address),
+					       (MCF_EDMA_TCD_ATTR_SSIZE_32BIT |
+						MCF_EDMA_TCD_ATTR_DSIZE_32BIT),
+					       0x04,		/* soff */
+					       byte_count/2,	/* bytes/loop */
+					       0x0,		/* slast */
+					       2,		/* loop count */
+					       0x04,		/* doff */
+					       0x0,		/* dlast_sga */
+					       0x0);		/* req dis */
+#endif
+
+		printk(KERN_INFO "DMA Channel %d  Bytes = 0x%x\n",
+		       channel, byte_count);
+		/* Start DMA. */
+		mcf_edma_start_transfer(channel);
+
+		printk(KERN_INFO "DMA channel %d started.\n", channel);
+
+		/* Wait for DMA to complete */
+		while (!*mcf_edma_test_interrupt_p)
+			;
+
+		/* Test data */
+		if (mcf_edma_test_block_compare
+		    (start_address, dest_address, byte_count))
+			printk(KERN_INFO "Data are moved correctly.\n");
+		else
+			printk(KERN_INFO "ERROR!!! Data error!\n");
+
+		printk(KERN_INFO "DMA channel %d test complete.\n", channel);
+		printk(KERN_INFO "-------------------------------\n");
+
+		/* Complement test data so next channel test does not
+		 * use same values */
+		test_data = ~test_data;
+	}
+
+test_end:
+	printk(KERN_INFO "All tests are complete\n\n");
+	printk(KERN_INFO
+		"It has been automatically allocated %d eDMA channels:\n", i);
+	for (i = 0; i < MCF_EDMA_CHANNELS; i++) {
+		if ((allocated_channels_low & (1 << i)) ||
+		    (allocated_channels_high & (1 << (i - 32)))) {
+			printk(KERN_INFO "%d,\n", i);
+			mcf_edma_free_channel(i, NULL);
+		}
+	}
+	printk(KERN_INFO "===============================================\n\n");
+
+	kfree(dest_address);
+err_free_mem:
+	kfree(start_address);
+err_out:
+	return;
+}
+
+/********************************************************************/
+
+static int __init
+mcf_edma_test_init(void)
+{
+	mcf_edma_test_run();
+
+	/* We intentionaly return -EAGAIN to prevent keeping
+	 * the module. It does all its work from init()
+	 * and doesn't offer any runtime functionality */
+	return -EAGAIN;
+}
+
+static void __exit
+mcf_edma_test_exit(void)
+{
+}
+
+module_init(mcf_edma_test_init);
+module_exit(mcf_edma_test_exit);
+
+MODULE_DESCRIPTION(MCF_EDMA_TEST_DRIVER_INFO);
+MODULE_AUTHOR(MCF_EDMA_TEST_DRIVER_AUTHOR);
+MODULE_LICENSE(MCF_EDMA_TEST_DRIVER_LICENSE);