openwrt-xburst/target/linux/ep93xx/patches-2.6.30/005-ep93xx-dma.patch

--- /dev/null
+++ b/arch/arm/mach-ep93xx/dma_ep93xx.c
@@ -0,0 +1,2940 @@
+/******************************************************************************
+ * arch/arm/mach-ep9312/dma_ep93xx.c
+ *
+ * Support functions for the ep93xx internal DMA channels.
+ * (see also Documentation/arm/ep93xx/dma.txt)
+ *
+ * Copyright (C) 2003  Cirrus Logic
+ *
+ * A large portion of this file is based on the dma api implemented by
+ * Nicolas Pitre, dma-sa1100.c, copyrighted 2000.
+ *
+ *
+ * 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
+ *
+ ****************************************************************************/
+#include <linux/autoconf.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/mach/dma.h>
+#include "dma_ep93xx.h"
+
+/*****************************************************************************
+ *
+ * Debugging macros
+ *
+ ****************************************************************************/
+#undef DEBUG
+//#define DEBUG   1
+#ifdef DEBUG
+#define DPRINTK( fmt, arg... )  printk( fmt, ##arg )
+#else
+#define DPRINTK( fmt, arg... )
+#endif
+
+/*****************************************************************************
+ *
+ * static global variables
+ *
+ ****************************************************************************/
+ep93xx_dma_t dma_chan[MAX_EP93XX_DMA_CHANNELS];
+
+/*
+ *  lock used to protect the list of dma channels while searching for a free
+ *  channel during dma_request.
+ */
+//static spinlock_t dma_list_lock;
+static spinlock_t dma_list_lock = SPIN_LOCK_UNLOCKED;
+
+/*****************************************************************************
+ *
+ *  Internal DMA processing functions.
+ *
+ ****************************************************************************/
+/*****************************************************************************
+ *
+ *  get_dma_channel_from_handle()
+ *
+ *  If Handle is valid, returns the DMA channel # (0 to 9 for channels 1-10)
+ *  If Handle is not valid, returns -1.
+ *
+ ****************************************************************************/
+static int
+dma_get_channel_from_handle(int handle)
+{
+	int channel;
+
+	/*
+	 *  Get the DMA channel # from the handle.
+	 */
+	channel = ((int)handle & DMA_HANDLE_SPECIFIER_MASK) >> 28;
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (dma_chan[channel].last_valid_handle != (int)handle) {
+		DPRINTK("DMA ERROR - invalid handle 0x%x \n", handle);
+		return(-1);
+	}
+
+	/*
+	 *  See if this instance is still open
+	 */
+	if (!dma_chan[channel].ref_count )
+		return(-1);
+
+	return(channel);
+}
+
+static void dma_m2m_transfer_done(ep93xx_dma_t *dma)
+{
+	unsigned int uiCONTROL;
+	unsigned int M2M_reg_base = dma->reg_base;
+	unsigned int read_back;
+
+	DPRINTK("1  ");
+
+	outl( 0, M2M_reg_base+M2M_OFFSET_INTERRUPT );
+
+	if (dma->total_buffers) {
+		/*
+		 * The current_buffer has already been tranfered, so add the
+		 * byte count to the total_bytes field.
+		 */
+		dma->total_bytes = dma->total_bytes +
+			dma->buffer_queue[dma->current_buffer].size;
+
+		/*
+		 * Mark the current_buffer as used.
+		 */
+		dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+		/*
+		 * Increment the used buffer counter
+		 */
+		dma->used_buffers++;
+
+		DPRINTK("#%d", dma->current_buffer);
+
+		/*
+		 * Increment the current_buffer
+		 */
+		dma->current_buffer = (dma->current_buffer + 1) %
+				      MAX_EP93XX_DMA_BUFFERS;
+
+		/*
+		 * check if there's a new buffer to transfer.
+		 */
+		if (dma->new_buffers && dma->xfer_enable) {
+			/*
+			 * We have a new buffer to transfer so program in the
+			 * buffer values.  Since a STALL interrupt was
+			 * triggered, we program the buffer descriptor 0
+			 *
+			 * Set the SAR_BASE/DAR_BASE/BCR registers with values
+			 * from the next buffer in the queue.
+			 */
+			outl( dma->buffer_queue[dma->current_buffer].source,
+			      M2M_reg_base + M2M_OFFSET_SAR_BASE0 );
+
+			outl( dma->buffer_queue[dma->current_buffer].dest,
+			      M2M_reg_base + M2M_OFFSET_DAR_BASE0 );
+
+			outl( dma->buffer_queue[dma->current_buffer].size,
+			      M2M_reg_base + M2M_OFFSET_BCR0 );
+
+			DPRINTK("SAR_BASE0 - 0x%x\n", dma->buffer_queue[dma->current_buffer].source);
+			DPRINTK("DAR_BASE0 - 0x%x\n", dma->buffer_queue[dma->current_buffer].dest);
+			DPRINTK("BCR0 - 0x%x\n", dma->buffer_queue[dma->current_buffer].size);
+
+			/*
+			 * Decrement the new buffer counter
+			 */
+			dma->new_buffers--;
+
+			/*
+			 * If there's a second new buffer, we program the
+			 * second buffer descriptor.
+			 */
+			if (dma->new_buffers) {
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].source,
+				      M2M_reg_base+M2M_OFFSET_SAR_BASE1 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].dest,
+				      M2M_reg_base+M2M_OFFSET_DAR_BASE1 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].size,
+				      M2M_reg_base+M2M_OFFSET_BCR1 );
+
+				uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+				uiCONTROL |= CONTROL_M2M_NFBINTEN;
+				outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+				dma->new_buffers--;
+			}
+		} else {
+			DPRINTK("2 \n");
+			/*
+			 * There's a chance we setup both buffer descriptors,
+			 * but didn't service the NFB quickly enough, causing
+			 * the channel to transfer both buffers, then enter the
+			 * stall state.  So, we need to be able to process the
+			 * second buffer.
+			 */
+			if ((dma->used_buffers + dma->new_buffers) < dma->total_buffers)
+			{
+				DPRINTK("3 ");
+
+				/*
+				 * The current_buffer has already been
+				 * tranferred, so add the byte count to the
+				 * total_bytes field.
+				 */
+				dma->total_bytes = dma->total_bytes +
+					dma->buffer_queue[dma->current_buffer].size;
+
+				/*
+				 * Mark the current_buffer as used.
+				 */
+				dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+				/*
+				 * Increment the used buffer counter
+				 */
+				dma->used_buffers++;
+
+				DPRINTK("#%d", dma->current_buffer);
+
+				/*
+				 * Increment the current buffer pointer.
+				 */
+				dma->current_buffer = (dma->current_buffer + 1) %
+						      MAX_EP93XX_DMA_BUFFERS;
+
+			}
+
+			/*
+			 * No new buffers to transfer, so disable the channel.
+			 */
+			uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+			uiCONTROL &= ~CONTROL_M2M_ENABLE;
+			outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+			/*
+			 * Indicate that this channel is in the pause by
+			 * starvation state by setting the pause bit to true.
+			 */
+			dma->pause = TRUE;
+		}
+	} else {
+		/*
+		 * No buffers to transfer, or old buffers to mark as used,
+		 * so disable the channel
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2M_ENABLE;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+		/*
+		 * Must read the control register back after a write.
+		 */
+		read_back = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+
+		/*
+		 * Indicate that this channel is in the pause by
+		 * starvation state by setting the pause bit to true.
+		 */
+		dma->pause = TRUE;
+	}
+}
+
+static void dma_m2m_next_frame_buffer(ep93xx_dma_t *dma)
+{
+	int loop;
+	unsigned int uiCONTROL;
+	unsigned int M2M_reg_base = dma->reg_base;
+
+	DPRINTK("5  ");
+
+	if (dma->total_buffers) {
+		DPRINTK("6  ");
+		/*
+		 * The iCurrentBuffer has already been transfered.  so add the
+		 * byte count from the current buffer to the total byte count.
+		 */
+		dma->total_bytes = dma->total_bytes +
+			dma->buffer_queue[dma->current_buffer].size;
+
+		/*
+		 * Mark the Current Buffer as used.
+		 */
+		dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+		/*
+		 * Increment the used buffer counter
+		 */
+		dma->used_buffers++;
+
+		DPRINTK("#%d", dma->current_buffer);
+
+		if ((dma->buffer_queue[
+		    (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].last) ||
+		    (dma->new_buffers == 0) || (dma->xfer_enable == FALSE)) {
+			DPRINTK("7  ");
+
+			/*
+			 * This is the last Buffer in this transaction, so
+			 * disable the NFB interrupt.  We shouldn't get an NFB
+			 * int when the FSM moves to the ON state where it
+			 * would typically get the NFB int indicating a new
+			 * buffer can be programmed.  Instead, once in the ON
+			 * state, the DMA will just proceed to complete the
+			 * transfer of the current buffer, move the FSB
+			 * directly to the STALL state where a STALL interrupt
+			 * will be generated.
+			 */
+			uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+			uiCONTROL &= ~CONTROL_M2M_NFBINTEN ;
+			outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+			/*
+			 * The current buffer has been transferred, so
+			 * increment the current buffer counter to reflect
+			 * this.
+			 */
+			dma->current_buffer = (dma->current_buffer + 1) %
+					      MAX_EP93XX_DMA_BUFFERS;
+
+			DPRINTK("End of NFB handling. \n");
+			DPRINTK("CONTROL - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_CONTROL) );
+			DPRINTK("STATUS - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_STATUS) );
+			DPRINTK("SAR_BASE0 - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_SAR_BASE0) );
+			DPRINTK("SAR_CUR0 - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_SAR_CURRENT0) );
+			DPRINTK("DAR_BASE0 - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_DAR_BASE0) );
+			DPRINTK("DAR_CUR0 - 0x%x \n",
+                                inl(M2M_reg_base+M2M_OFFSET_DAR_CURRENT0) );
+
+			DPRINTK("Buffer	buf_id	 source	   size	   last	   used \n");
+			for (loop = 0; loop < 32; loop ++)
+				DPRINTK("%d		0x%x		0x%x		 0x%x		%d		 %d \n",
+					loop, dma->buffer_queue[loop].buf_id,
+					dma->buffer_queue[loop].source,
+					dma->buffer_queue[loop].size,
+					dma->buffer_queue[loop].last,
+					dma->buffer_queue[loop].used);
+			DPRINTK("pause	 0x%x		0x%x		 0x%x		%d		 %d \n",
+				dma->pause_buf.buf_id, dma->pause_buf.source,
+				dma->pause_buf.size, dma->pause_buf.last,
+				dma->pause_buf.used);
+
+			DPRINTK("Pause - %d \n", dma->pause);
+			DPRINTK("xfer_enable - %d \n", dma->xfer_enable);
+			DPRINTK("total bytes - 0x%x \n", dma->total_bytes);
+			DPRINTK("total buffer - %d \n", dma->total_buffers);
+			DPRINTK("new buffers - %d \n", dma->new_buffers);
+			DPRINTK("current buffer - %d \n", dma->current_buffer);
+			DPRINTK("last buffer - %d \n", dma->last_buffer);
+			DPRINTK("used buffers - %d \n", dma->used_buffers);
+			DPRINTK("callback addr - 0x%p \n", dma->callback);
+
+		} else if (dma->new_buffers) {
+			DPRINTK("8  ");
+			/*
+			 * We have a new buffer, so increment the current
+			 * buffer to point to the next buffer, which is already
+			 * programmed into the DMA. Next time around, it'll be
+			 * pointing to the current buffer.
+			 */
+			dma->current_buffer = (dma->current_buffer + 1) %
+					      MAX_EP93XX_DMA_BUFFERS;
+
+			/*
+			 * We know we have a new buffer to program as the next
+			 * buffer, so check which set of SAR_BASE/DAR_BASE/BCR
+			 * registers to program.
+			 */
+			if ( inl(M2M_reg_base+M2M_OFFSET_STATUS) & STATUS_M2M_NB ) {
+				/*
+				 * Set the SAR_BASE1/DAR_BASE1/BCR1 registers
+				 * with values from the next buffer in the
+				 * queue.
+				 */
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].source,
+				      M2M_reg_base+M2M_OFFSET_SAR_BASE1 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].dest,
+				      M2M_reg_base+M2M_OFFSET_DAR_BASE1 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].size,
+				      M2M_reg_base+M2M_OFFSET_BCR1 );
+			} else {
+				/*
+				 * Set the SAR_BASE0/DAR_BASE0/BCR0 registers
+				 * with values from the next buffer in the
+				 * queue.
+				 */
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].source,
+				      M2M_reg_base+M2M_OFFSET_SAR_BASE0 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].dest,
+				      M2M_reg_base+M2M_OFFSET_DAR_BASE0 );
+
+				outl( dma->buffer_queue[(dma->current_buffer + 1) %
+							MAX_EP93XX_DMA_BUFFERS].size,
+				      M2M_reg_base+M2M_OFFSET_BCR0 );
+			}
+
+			/*
+			 *  Decrement the new buffers counter
+			 */
+			dma->new_buffers--;
+		}
+	} else {
+		/*
+		 * Total number of buffers is 0 - really we should never get
+		 * here, but just in case.
+		 */
+		DPRINTK("9 \n");
+
+		/*
+		 *  No new buffers to transfer, so Disable the channel
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2M_ENABLE;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+		/*
+		 *  Indicate that the channel is paused by starvation.
+		 */
+		dma->pause = 1;
+	}
+}
+
+/*****************************************************************************
+ *
+ * dma_m2m_irq_handler
+ *
+ ****************************************************************************/
+static irqreturn_t
+dma_m2m_irq_handler(int irq, void *dev_id)
+{
+	ep93xx_dma_t *dma = (ep93xx_dma_t *)dev_id;
+	unsigned int M2M_reg_base = dma->reg_base;
+	ep93xx_dma_dev_t dma_int = UNDEF_INT;
+	int status;
+
+//	printk("+m2m irq=%d\n", irq);
+
+	/*
+	 *  Determine what kind of dma interrupt this is.
+	 */
+	status = inl(M2M_reg_base + M2M_OFFSET_INTERRUPT);
+	if ( status & INTERRUPT_M2M_DONEINT )
+		dma_int = DONE; // we're done with a requested dma
+	else if ( status & INTERRUPT_M2M_NFBINT )
+		dma_int = NFB;  // we're done with one dma buffer
+
+	DPRINTK("IRQ: b=%#x st=%#x\n", (int)dma->current_buffer, dma_int);
+
+	switch (dma_int) {
+	/*
+	 *  Next Frame Buffer Interrupt.  If there's a new buffer program it
+	 *  Check if this is the last buffer in the transfer,
+	 *  and if it is, disable the NFB int to prevent being
+	 *  interrupted for another buffer when we know there won't be
+	 *  another.
+	 */
+	case NFB:
+		dma_m2m_next_frame_buffer(dma);
+		break;
+	/*
+	 *  Done interrupt generated, indicating that the transfer is complete.
+	 */
+	case DONE:
+		dma_m2m_transfer_done(dma);
+		break;
+
+	default:
+		break;
+	}
+
+	if ((dma_int != UNDEF_INT) && dma->callback)
+		dma->callback(dma_int, dma->device, dma->user_data);
+
+	return IRQ_HANDLED;
+}
+
+/*****************************************************************************
+ *
+ * dma_m2p_irq_handler
+ *
+ *
+ *
+ ****************************************************************************/
+static irqreturn_t
+dma_m2p_irq_handler(int irq, void *dev_id)
+{
+	ep93xx_dma_t *dma = (ep93xx_dma_t *) dev_id;
+	unsigned int M2P_reg_base = dma->reg_base;
+	unsigned int read_back;
+	ep93xx_dma_dev_t dma_int = UNDEF_INT;
+	unsigned int loop, uiCONTROL, uiINTERRUPT;
+
+	/*
+	 *  Determine what kind of dma interrupt this is.
+	 */
+	if ( inl(M2P_reg_base+M2P_OFFSET_INTERRUPT) & INTERRUPT_M2P_STALLINT )
+		dma_int = STALL;
+	else if ( inl(M2P_reg_base+M2P_OFFSET_INTERRUPT) & INTERRUPT_M2P_NFBINT )
+		dma_int = NFB;
+	else if ( inl(M2P_reg_base+M2P_OFFSET_INTERRUPT) & INTERRUPT_M2P_CHERRORINT )
+		dma_int = CHERROR;
+
+	/*
+	 *  Stall Interrupt: The Channel is stalled, meaning nothing is
+	 *  programmed to transfer right now.  So, we're back to the
+	 *  beginnning.  If there's a buffer to transfer, program it into
+	 *  max and base 0 registers.
+	 */
+	if (dma_int == STALL) {
+		DPRINTK("1  ");
+
+		if (dma->total_buffers) {
+			/*
+			 * The current_buffer has already been tranfered, so
+			 * add the byte count to the total_bytes field.
+			 */
+			dma->total_bytes = dma->total_bytes +
+				dma->buffer_queue[dma->current_buffer].size;
+
+			/*
+			 *  Mark the current_buffer as used.
+			 */
+			dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+			/*
+			 *  Increment the used buffer counter
+			 */
+			dma->used_buffers++;
+
+			DPRINTK("#%d", dma->current_buffer);
+
+			/*
+			 *  Increment the current_buffer
+			 */
+			dma->current_buffer = (dma->current_buffer + 1) %
+					      MAX_EP93XX_DMA_BUFFERS;
+
+			/*
+			 *  check if there's a new buffer to transfer.
+			 */
+			if (dma->new_buffers && dma->xfer_enable) {
+				/*
+				 * We have a new buffer to transfer so program
+				 * in the buffer values.  Since a STALL
+				 * interrupt was triggered, we program the
+				 * base0 and maxcnt0
+				 *
+				 * Set the MAXCNT0 register with the buffer
+				 * size
+				 */
+				outl( dma->buffer_queue[dma->current_buffer].size,
+					  M2P_reg_base+M2P_OFFSET_MAXCNT0 );
+
+				/*
+				 * Set the BASE0 register with the buffer base
+				 * address
+				 */
+				outl( dma->buffer_queue[dma->current_buffer].source,
+					  M2P_reg_base+M2P_OFFSET_BASE0 );
+
+				/*
+				 *  Decrement the new buffer counter
+				 */
+				dma->new_buffers--;
+
+				if (dma->new_buffers) {
+					DPRINTK("A  ");
+					/*
+					 * Set the MAXCNT1 register with the
+					 * buffer size
+					 */
+					outl( dma->buffer_queue[(dma->current_buffer + 1) %
+											MAX_EP93XX_DMA_BUFFERS].size,
+						  M2P_reg_base+M2P_OFFSET_MAXCNT1 );
+
+					/*
+					 * Set the BASE1 register with the
+					 * buffer base address
+					 */
+					outl( dma->buffer_queue[dma->current_buffer + 1 %
+											MAX_EP93XX_DMA_BUFFERS].source,
+						  M2P_reg_base+M2P_OFFSET_BASE1 );
+
+					/*
+					 *  Decrement the new buffer counter
+					 */
+					dma->new_buffers--;
+
+					/*
+					 *  Enable the NFB Interrupt.
+					 */
+					uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+					uiCONTROL |= CONTROL_M2P_NFBINTEN;
+					outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+				}
+			} else {
+				/*
+				 *  No new buffers.
+				 */
+				DPRINTK("2 \n");
+
+				/*
+				 *  There's a chance we setup both buffer descriptors, but
+				 *  didn't service the NFB quickly enough, causing the channel
+				 *  to transfer both buffers, then enter the stall state.
+				 *  So, we need to be able to process the second buffer.
+				 */
+				if ((dma->used_buffers + dma->new_buffers) < dma->total_buffers) {
+					DPRINTK("3 ");
+
+					/*
+					 *  The current_buffer has already been tranfered, so add the
+					 *  byte count to the total_bytes field.
+					 */
+					dma->total_bytes = dma->total_bytes +
+						dma->buffer_queue[dma->current_buffer].size;
+
+					/*
+					 *  Mark the current_buffer as used.
+					 */
+					dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+					/*
+					 *  Increment the used buffer counter
+					 */
+					dma->used_buffers++;
+
+					DPRINTK("#%d", dma->current_buffer);
+
+					/*
+					 *  Increment the current buffer pointer.
+					 */
+					dma->current_buffer = (dma->current_buffer + 1) %
+						MAX_EP93XX_DMA_BUFFERS;
+
+				}
+
+				/*
+				 *  No new buffers to transfer, so disable the channel.
+				 */
+				uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+				uiCONTROL &= ~CONTROL_M2P_ENABLE;
+				outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+				/*
+				 *  Indicate that this channel is in the pause by starvation
+				 *  state by setting the pause bit to true.
+				 */
+				dma->pause = TRUE;
+
+				DPRINTK("STATUS - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_STATUS) );
+				DPRINTK("CONTROL - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_CONTROL) );
+				DPRINTK("REMAIN - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_REMAIN) );
+				DPRINTK("PPALLOC - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_PPALLOC) );
+				DPRINTK("BASE0 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE0) );
+				DPRINTK("MAXCNT0 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT0) );
+				DPRINTK("CURRENT0 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT0) );
+				DPRINTK("BASE1 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE1) );
+				DPRINTK("MAXCNT1 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT1) );
+				DPRINTK("CURRENT1 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT1) );
+
+				DPRINTK("Buffer	buf_id	 source	   size	   last	   used \n");
+				for (loop = 0; loop < 32; loop ++)
+					DPRINTK("%d		0x%x		0x%x		 0x%x		%d		 %d \n",
+							loop, dma->buffer_queue[loop].buf_id, dma->buffer_queue[loop].source,
+							dma->buffer_queue[loop].size,
+							dma->buffer_queue[loop].last, dma->buffer_queue[loop].used);
+				DPRINTK("pause	 0x%x		0x%x		 0x%x		%d		 %d \n",
+						dma->pause_buf.buf_id, dma->pause_buf.source, dma->pause_buf.size,
+						dma->pause_buf.last, dma->pause_buf.used);
+
+				DPRINTK("Pause - %d \n", dma->pause);
+				DPRINTK("xfer_enable - %d \n", dma->xfer_enable);
+				DPRINTK("total bytes - 0x%x \n", dma->total_bytes);
+				DPRINTK("total buffer - %d \n", dma->total_buffers);
+				DPRINTK("new buffers - %d \n", dma->new_buffers);
+				DPRINTK("current buffer - %d \n", dma->current_buffer);
+				DPRINTK("last buffer - %d \n", dma->last_buffer);
+				DPRINTK("used buffers - %d \n", dma->used_buffers);
+				DPRINTK("callback addr - 0x%p \n", dma->callback);
+			}
+		} else {
+			/*
+			 *  No buffers to transfer, or old buffers to mark as used,
+			 *  so Disable the channel
+			 */
+			uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+			uiCONTROL &= ~CONTROL_M2P_ENABLE;
+			outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+			/*
+			 *  Must read the control register back after a write.
+			 */
+			read_back = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+
+			/*
+			 *  Indicate that this channel is in the pause by
+			 *  starvation state by setting the pause bit to true.
+			 */
+			dma->pause = TRUE;
+		}
+	}
+
+	/*
+	 *  Next Frame Buffer Interrupt.  If there's a new buffer program it
+	 *  Check if this is the last buffer in the transfer,
+	 *  and if it is, disable the NFB int to prevent being
+	 *  interrupted for another buffer when we know there won't be
+	 *  another.
+	 */
+	if (dma_int == NFB) {
+		DPRINTK("5  ");
+
+		if (dma->total_buffers) {
+			DPRINTK("6  ");
+			/*
+			 *  The iCurrentBuffer has already been transfered.  so add the
+			 *  byte count from the current buffer to the total byte count.
+			 */
+			dma->total_bytes = dma->total_bytes +
+				dma->buffer_queue[dma->current_buffer].size;
+
+			/*
+			 *  Mark the Current Buffer as used.
+			 */
+			dma->buffer_queue[dma->current_buffer].used = TRUE;
+
+			/*
+			 *  Increment the used buffer counter
+			 */
+			dma->used_buffers++;
+
+			DPRINTK("#%d", dma->current_buffer);
+
+			if ((dma->buffer_queue[
+			    (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].last) ||
+			    (dma->new_buffers == 0) || (dma->xfer_enable == FALSE)) {
+				DPRINTK("7  ");
+
+				/*
+				 *  This is the last Buffer in this transaction, so disable
+				 *  the NFB interrupt.  We shouldn't get an NFB int when the
+				 *  FSM moves to the ON state where it would typically get the
+				 *  NFB int indicating a new buffer can be programmed.
+				 *  Instead, once in the ON state, the DMA will just proceed
+				 *  to complet the transfer of the current buffer, move the
+				 *  FSB directly to the STALL state where a STALL interrupt
+				 *  will be generated.
+				 */
+				uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+				uiCONTROL &= ~CONTROL_M2P_NFBINTEN;
+				outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+				/*
+				 *  The current buffer has been transferred, so increment
+				 *  the current buffer counter to reflect this.
+				 */
+				dma->current_buffer = (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS;
+
+				DPRINTK("End of NFB handling. \n");
+				DPRINTK("STATUS - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_STATUS) );
+				DPRINTK("CONTROL - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_CONTROL) );
+				DPRINTK("REMAIN - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_REMAIN) );
+				DPRINTK("PPALLOC - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_PPALLOC) );
+				DPRINTK("BASE0 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE0) );
+				DPRINTK("MAXCNT0 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT0) );
+				DPRINTK("CURRENT0 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT0) );
+				DPRINTK("BASE1 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE1) );
+				DPRINTK("MAXCNT1 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT1) );
+				DPRINTK("CURRENT1 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT1) );
+
+				DPRINTK("Buffer	buf_id	 source	   size	   last	   used \n");
+				for (loop = 0; loop < 32; loop ++)
+					DPRINTK("%d		0x%x		0x%x		 0x%x		%d		 %d \n",
+							loop, dma->buffer_queue[loop].buf_id, dma->buffer_queue[loop].source,
+							dma->buffer_queue[loop].size,
+							dma->buffer_queue[loop].last, dma->buffer_queue[loop].used);
+				DPRINTK("pause	 0x%x		0x%x		 0x%x		%d		 %d \n",
+						dma->pause_buf.buf_id, dma->pause_buf.source, dma->pause_buf.size,
+						dma->pause_buf.last, dma->pause_buf.used);
+
+				DPRINTK("Pause - %d \n", dma->pause);
+				DPRINTK("xfer_enable - %d \n", dma->xfer_enable);
+				DPRINTK("total bytes - 0x%x \n", dma->total_bytes);
+				DPRINTK("total buffer - %d \n", dma->total_buffers);
+				DPRINTK("new buffers - %d \n", dma->new_buffers);
+				DPRINTK("current buffer - %d \n", dma->current_buffer);
+				DPRINTK("last buffer - %d \n", dma->last_buffer);
+				DPRINTK("used buffers - %d \n", dma->used_buffers);
+				DPRINTK("callback addr - 0x%p \n", dma->callback);
+
+			} else if (dma->new_buffers) {
+				DPRINTK("8  ");
+				/*
+				 *  we have a new buffer, so increment the current buffer to
+				 *  point to the next buffer, which is already programmed into
+				 *  the DMA. Next time around, it'll be pointing to the
+				 *  current buffer.
+				 */
+				dma->current_buffer = (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS;
+
+				/*
+				 *  we know we have a new buffer to program as the next
+				 *  buffer, so check which set of MAXCNT and BASE registers
+				 *  to program.
+				 */
+				if ( inl(M2P_reg_base+M2P_OFFSET_STATUS) & STATUS_M2P_NEXTBUFFER ) {
+					/*
+					 *  Set the MAXCNT1 register with the buffer size
+					 */
+					outl( dma->buffer_queue[
+					      (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].size,
+					      M2P_reg_base+M2P_OFFSET_MAXCNT1 );
+
+					/*
+					 *  Set the BASE1 register with the buffer base address
+					 */
+					outl( dma->buffer_queue[
+					      (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].source,
+					      M2P_reg_base+M2P_OFFSET_BASE1 );
+				} else {
+					/*
+					 *  Set the MAXCNT0 register with the buffer size
+					 */
+					outl( dma->buffer_queue[
+					      (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].size,
+					       M2P_reg_base+M2P_OFFSET_MAXCNT0 );
+
+					/*
+					 *  Set the BASE0 register with the buffer base address
+					 */
+					outl( dma->buffer_queue[
+					      (dma->current_buffer + 1) % MAX_EP93XX_DMA_BUFFERS].source,
+					      M2P_reg_base+M2P_OFFSET_BASE0 );
+				}
+
+				/*
+				 *  Decrement the new buffers counter
+				 */
+				dma->new_buffers--;
+			}
+		} else {
+			/*
+			 *  Total number of buffers is 0 - really we should never get here,
+			 *  but just in case.
+			 */
+			DPRINTK("9 \n");
+
+			/*
+			 *  No new buffers to transfer, so Disable the channel
+			 */
+			uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+			uiCONTROL &= ~CONTROL_M2P_ENABLE;
+			outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+		}
+	}
+
+	/*
+	 *  Channel Error Interrupt, or perhipheral interrupt, specific to the
+	 *  memory to/from peripheral channels.
+	 */
+	if (dma_int == CHERROR) {
+		/*
+		 *  just clear the interrupt, it's really up to the peripheral
+		 *  driver to determine if any further action is necessary.
+		 */
+		uiINTERRUPT = inl(M2P_reg_base+M2P_OFFSET_INTERRUPT);
+		uiINTERRUPT &= ~INTERRUPT_M2P_CHERRORINT;
+		outl( uiINTERRUPT, M2P_reg_base+M2P_OFFSET_INTERRUPT );
+	}
+
+	/*
+	 *  Make sure the interrupt was valid, and if it was, then check
+	 *  if a callback function was installed for this DMA channel.  If a
+	 *  callback was installed call it.
+	 */
+	if ((dma_int != UNDEF_INT) && dma->callback)
+		dma->callback(dma_int, dma->device, dma->user_data);
+
+	return IRQ_HANDLED;
+}
+
+/*****************************************************************************
+ *
+ * ep9312_dma_open_m2p(int device)
+ *
+ * Description: This function will attempt to open a M2P/P2M DMA channel.
+ *			  If the open is successful, the channel number is returned,
+ *			  otherwise a negative number is returned.
+ *
+ * Parameters:
+ *  device:	 device for which the dma channel is requested.
+ *
+ ****************************************************************************/
+static int
+dma_open_m2p(int device)
+{
+	int channel = -1;
+	unsigned int loop;
+	unsigned int M2P_reg_base;
+	unsigned int uiPWRCNT;
+	/*unsigned long flags;*/
+
+	DPRINTK("DMA Open M2P with hw dev %d\n", device);
+
+	/*
+	 *  Lock the dma channel list.
+	 */
+	//spin_lock_irqsave(&dma_list_lock, flags);
+	spin_lock(&dma_list_lock);
+
+	/*
+	 * Verify that the device requesting DMA isn't already using a DMA channel
+	 */
+	if (device >= 10)
+		loop = 1;		 // Rx transfer requested
+	else
+		loop = 0;		 // Tx transfer requested
+
+	for (; loop < 10; loop = loop + 2)
+		/*
+		 *  Before checking for a matching device, check that the
+		 *  channel is in use, otherwise the device field is
+		 *  invalid.
+		 */
+		if (dma_chan[loop].ref_count)
+			if (device == dma_chan[loop].device) {
+				DPRINTK("DMA Open M2P - Error\n");
+				return(-1);
+			}
+
+	/*
+	 *  Get a DMA channel instance for the given hardware device.
+	 *  If this is a TX look for even numbered channels, else look for
+	 *  odd numbered channels
+	 */
+	if (device >= 10)
+		loop = 1;		 /* Rx transfer requested */
+	else
+		loop = 0;		 /* Tx transfer requested */
+
+	for (; loop < 10; loop = loop + 2)
+		if (!dma_chan[loop].ref_count) {
+			/*
+			 *  Capture the channel and increment the reference count.
+			 */
+			channel = loop;
+			dma_chan[channel].ref_count++;
+			break;
+		}
+
+	/*
+	 *  Unlock the dma channel list.
+	 */
+	//spin_unlock_irqrestore(&dma_list_lock, flags);
+	spin_unlock(&dma_list_lock);
+	/*
+	 *  See if we got a valid channel.
+	 */
+	if (channel < 0)
+		return(-1);
+
+	/*
+	 *  Point regs to the correct dma channel register base.
+	 */
+	M2P_reg_base = dma_chan[channel].reg_base;
+
+	/*
+	 *  Turn on the clock for the specified DMA channel
+	 *  TODO: need to use the correct register name for the
+	 *  power control register.
+	 */
+	uiPWRCNT = inl(/*SYSCON_PWRCNT*/EP93XX_SYSCON_CLOCK_CONTROL);
+	switch (channel) {
+	case 0:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH0;
+		break;
+
+	case 1:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH1;
+		break;
+
+	case 2:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH2;
+		break;
+
+	case 3:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH3;
+		break;
+
+	case 4:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH4;
+		break;
+
+	case 5:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH5;
+		break;
+
+	case 6:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH6;
+		break;
+
+	case 7:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH7;
+		break;
+
+	case 8:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH8;
+		break;
+
+	case 9:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2PCH9;
+		break;
+
+	default:
+		return(-1);
+	}
+	outl( uiPWRCNT, /*SYSCON_PWRCNT*/EP93XX_SYSCON_CLOCK_CONTROL );
+
+	/*
+	 *  Clear out the control register before any further setup.
+	 */
+	outl( 0, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+	/*
+	 *  Setup the peripheral port value in the DMA channel registers.
+	 */
+	if (device < 10)
+		outl( (unsigned int)device, M2P_reg_base+M2P_OFFSET_PPALLOC );
+	else
+		outl( (unsigned int)(device - 10), M2P_reg_base+M2P_OFFSET_PPALLOC );
+
+	/*
+	 *  Let's hold on to the value of the Hw device for comparison later.
+	 */
+	dma_chan[channel].device = device;
+
+	/*
+	 *  Success.
+	 */
+	return(channel);
+}
+
+/*****************************************************************************
+ *
+ * dma_open_m2m(int device)
+ *
+ * Description: This function will attempt to open a M2M DMA channel.
+ *			  If the open is successful, the channel number is returned,
+ *			  otherwise a negative number is returned.
+ *
+ * Parameters:
+ *  device:	 device for which the dma channel is requested.
+ *
+ ****************************************************************************/
+static int
+dma_open_m2m(int device)
+{
+	int channel = -1;
+	unsigned int loop;
+	unsigned int M2M_reg_base;
+	unsigned int uiPWRCNT, uiCONTROL;
+	/*unsigned long flags;*/
+
+	DPRINTK("DMA Open M2M with hw dev %d\n", device);
+
+	/*
+	 *  Lock the dma channel list.
+	 */
+	//spin_lock_irqsave(&dma_list_lock, flags);
+	spin_lock(&dma_list_lock);
+
+
+	/*
+	 *  Check if this device is already allocated a channel.
+	 *  TODO: can one M2M device be allocated multiple channels?
+	 */
+	for (loop = 10; loop < 12; loop++)
+		/*
+		 *  Before checking for a matching device, check that the
+		 *  channel is in use, otherwise the device field is
+		 *  invalid.
+		 */
+		if (dma_chan[loop].ref_count)
+			if (device == dma_chan[loop].device) {
+				DPRINTK("Error - dma_open_m2m - already allocated channel\n");
+
+				/*
+				 *  Unlock the dma channel list.
+				 */
+				//spin_unlock_irqrestore(&dma_list_lock, flags);
+				spin_unlock(&dma_list_lock);
+				/*
+				 *  Fail.
+				 */
+				return(-1);
+			}
+
+	/*
+	 *  Get a DMA channel instance for the given hardware device.
+	 */
+	for (loop = 10; loop < 12; loop++)
+		if (!dma_chan[loop].ref_count) {
+			/*
+			 *  Capture the channel and increment the reference count.
+			 */
+			channel = loop;
+			dma_chan[channel].ref_count++;
+			break;
+		}
+
+	/*
+	 *  Unlock the dma channel list.
+	 */
+	//spin_unlock(dma_list_lock);
+	spin_unlock(&dma_list_lock);
+	//spin_unlock_irqrestore(&dma_list_lock, flags);
+
+	/*
+	 *  See if we got a valid channel.
+	 */
+	if (channel < 0)
+		return(-1);
+
+	/*
+	 *  Point regs to the correct dma channel register base.
+	 */
+	M2M_reg_base = dma_chan[channel].reg_base;
+
+	/*
+	 *  Turn on the clock for the specified DMA channel
+	 *  TODO: need to use the correct register name for the
+	 *  power control register.
+	 */
+	uiPWRCNT = inl(/*SYSCON_PWRCNT*/EP93XX_SYSCON_CLOCK_CONTROL);
+	switch (channel) {
+	case 10:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2MCH0;
+		break;
+
+	case 11:
+		uiPWRCNT |= SYSCON_PWRCNT_DMA_M2MCH1;
+		break;
+
+	default:
+		return(-1);
+	}
+	outl( uiPWRCNT, /*SYSCON_PWRCNT*/EP93XX_SYSCON_CLOCK_CONTROL);
+
+	DPRINTK("DMA Open - power control: 0x%x \n", inl(SYSCON_PWRCNT) );
+
+	/*
+	 *  Clear out the control register before any further setup.
+	 */
+	outl( 0, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+	/*
+	 *  Setup the transfer mode and the request source selection within
+	 *  the DMA M2M channel registers.
+	 */
+	switch (device) {
+	case DMA_MEMORY:
+		/*
+		 * Clear TM field, set RSS field to 0
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_TM_MASK | CONTROL_M2M_RSS_MASK);
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		break;
+
+	case DMA_IDE:
+		/*
+		 * Set RSS field to 3, Set NO_HDSK, Set PW field to 1
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_RSS_MASK|CONTROL_M2M_PW_MASK);
+		uiCONTROL |= (3<<CONTROL_M2M_RSS_SHIFT) |
+			CONTROL_M2M_NO_HDSK |
+			(2<<CONTROL_M2M_PW_SHIFT);
+
+		uiCONTROL &= ~(CONTROL_M2M_ETDP_MASK);
+		uiCONTROL &= ~(CONTROL_M2M_DACKP);
+		uiCONTROL &= ~(CONTROL_M2M_DREQP_MASK);
+
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		break;
+
+	case DMARx_SSP:
+		/*
+		 * Set RSS field to 1, Set NO_HDSK, Set TM field to 2
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_RSS_MASK|CONTROL_M2M_TM_MASK);
+		uiCONTROL |= (1<<CONTROL_M2M_RSS_SHIFT) |
+			CONTROL_M2M_NO_HDSK |
+			(2<<CONTROL_M2M_TM_SHIFT);
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		break;
+
+	case DMATx_SSP:
+		/*
+		 * Set RSS field to 2, Set NO_HDSK, Set TM field to 1
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_RSS_MASK|CONTROL_M2M_TM_MASK);
+		uiCONTROL |= (2<<CONTROL_M2M_RSS_SHIFT) |
+			CONTROL_M2M_NO_HDSK |
+			(1<<CONTROL_M2M_TM_SHIFT);
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		break;
+
+	case DMATx_EXT_DREQ:
+		/*
+		 * Set TM field to 2, set RSS field to 0
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_RSS_MASK|CONTROL_M2M_TM_MASK);
+		uiCONTROL |= 1<<CONTROL_M2M_TM_SHIFT;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		break;
+
+	case DMARx_EXT_DREQ:
+		/*
+		 * Set TM field to 2, set RSS field to 0
+		 */
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~(CONTROL_M2M_RSS_MASK|CONTROL_M2M_TM_MASK);
+		uiCONTROL |= 2<<CONTROL_M2M_TM_SHIFT;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+		break;
+
+	default:
+		return -1;
+	}
+
+	/*
+	 *  Let's hold on to the value of the Hw device for comparison later.
+	 */
+	dma_chan[channel].device = device;
+
+	/*
+	 *  Success.
+	 */
+	return(channel);
+}
+
+/*****************************************************************************
+ *
+ *  int dma_config_m2m(ep93xx_dma_t * dma, unsigned int flags_m2m,
+ *			   dma_callback callback, unsigned int user_data)
+ *
+ *  Description: Configure the DMA channel and install a callback function.
+ *			   This function will have to be called for every transfer
+ *
+ *  dma:		Pointer to the dma instance data for the M2M channel to
+ *			  configure.
+ *  flags_m2m   Flags used to configure an M2M dma channel and determine
+ *			  if a callback function and user_data information are included
+ *			  in this call.
+ *  callback	function pointer which is called near the end of the
+ *			  dma channel's irq handler.
+ *  user_data   defined by the calling driver.
+ *
+ ****************************************************************************/
+static int
+dma_config_m2m(ep93xx_dma_t * dma, unsigned int flags_m2m,
+			   dma_callback callback, unsigned int user_data)
+{
+	unsigned long flags;
+	unsigned int M2M_reg_base, uiCONTROL;
+
+	/*
+	 *  Make sure the channel is disabled before configuring the channel.
+	 *
+	 *  TODO: Is this correct??   Making a big change here...
+	 */
+	/* if (!dma->pause || (!dma->pause && dma->xfer_enable)) */
+	if (dma->xfer_enable) {
+		/*
+		 *  DMA channel is not paused, so we can't configure it.
+		 */
+		DPRINTK("DMA channel not paused, so can't configure! \n");
+		return(-1);
+	}
+
+	/*
+	 *  Mask interrupts.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Setup a pointer into the dma channel's register set.
+	 */
+	M2M_reg_base = dma->reg_base;
+
+	uiCONTROL = inl(M2M_reg_base + M2M_OFFSET_CONTROL);
+	outl(0, M2M_reg_base + M2M_OFFSET_CONTROL);
+	inl(M2M_reg_base + M2M_OFFSET_CONTROL);
+	outl(uiCONTROL, M2M_reg_base + M2M_OFFSET_CONTROL);
+
+	/*
+	 *  By default we disable the stall interrupt.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+	uiCONTROL &= ~CONTROL_M2M_STALLINTEN;
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+	/*
+	 *  By default we disable the done interrupt.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+	uiCONTROL &= ~CONTROL_M2M_DONEINTEN;
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+	/*
+	 *  Set up the transfer control fields based on values passed in
+	 *  the flags_m2m field.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+
+	if ( flags_m2m & DESTINATION_HOLD )
+		uiCONTROL |= CONTROL_M2M_DAH;
+	else
+		uiCONTROL &= ~CONTROL_M2M_DAH;
+
+	if ( flags_m2m & SOURCE_HOLD )
+		uiCONTROL |= CONTROL_M2M_SAH;
+	else
+		uiCONTROL &= ~CONTROL_M2M_SAH;
+
+	uiCONTROL &= ~CONTROL_M2M_TM_MASK;
+	uiCONTROL |= (((flags_m2m & TRANSFER_MODE_MASK) >> TRANSFER_MODE_SHIFT) <<
+				  CONTROL_M2M_TM_SHIFT) & CONTROL_M2M_TM_MASK;
+
+	uiCONTROL &= ~CONTROL_M2M_PWSC_MASK;
+	uiCONTROL |= (((flags_m2m & WAIT_STATES_MASK) >> WAIT_STATES_SHIFT) <<
+				  CONTROL_M2M_PWSC_SHIFT) & CONTROL_M2M_PWSC_MASK;
+
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+	inl(M2M_reg_base + M2M_OFFSET_CONTROL);
+
+	/*
+	 *  Save the callback function in the dma instance for this channel.
+	 */
+	dma->callback = callback;
+
+	/*
+	 *  Save the user data in the the dma instance for this channel.
+	 */
+	dma->user_data = user_data;
+
+	/*
+	 *  Put the dma instance into the pause state by setting the
+	 *  pause bit to true.
+	 */
+	dma->pause = TRUE;
+
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int dma_start(int handle, unsigned int channels, unsigned int * handles)
+ *
+ *  Description: Initiate a transfer on up to 3 channels.
+ *
+ *  handle:	 handle for the channel to initiate transfer on.
+ *  channels:   number of channels to initiate transfers on.
+ *  handles:	pointer to an array of handles, one for each channel which
+ *			   is to be started.
+ *
+ ****************************************************************************/
+static int
+dma_start_m2m(int channel, ep93xx_dma_t * dma)
+{
+	unsigned long flags;
+	unsigned int M2M_reg_base = dma->reg_base;
+	unsigned int uiCONTROL;
+
+	/*
+	 *  Mask interrupts while we get this started.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Make sure the channel has at least one buffer in the queue.
+	 */
+	if (dma->new_buffers < 1) {
+		/*
+		 *  Unmask irqs
+		 */
+		local_irq_restore(flags);
+
+		DPRINTK("DMA Start: Channel starved.\n");
+
+		/*
+		 *  This channel does not have enough buffers queued up,
+		 *  so enter the pause by starvation state.
+		 */
+		dma->xfer_enable = TRUE;
+		dma->pause = TRUE;
+
+		/*
+		 *  Success.
+		 */
+		return(0);
+	}
+
+	/*
+	 *  Clear any pending interrupts.
+	 */
+	outl(0x0, M2M_reg_base+M2M_OFFSET_INTERRUPT);
+
+	/*
+	 *  Set up one or both buffer descriptors with values from the next one or
+	 *  two buffers in the queue.  By default disable the next frame buffer
+	 *  interrupt on the channel.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+	uiCONTROL &= ~CONTROL_M2M_NFBINTEN;
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+	/*
+	 * enable the done interrupt.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+	uiCONTROL |= CONTROL_M2M_DONEINTEN;
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+	/*
+	 *  Update the dma channel instance transfer state.
+	 */
+	dma->xfer_enable = TRUE;
+	dma->pause = FALSE;
+
+	/*
+	 *  Program up the first buffer descriptor with a source and destination
+	 *  and a byte count.
+	 */
+	outl( dma->buffer_queue[dma->current_buffer].source,
+	      M2M_reg_base+M2M_OFFSET_SAR_BASE0 );
+
+	outl( dma->buffer_queue[dma->current_buffer].dest,
+	      M2M_reg_base+M2M_OFFSET_DAR_BASE0 );
+
+	outl( dma->buffer_queue[dma->current_buffer].size,
+	      M2M_reg_base+M2M_OFFSET_BCR0 );
+
+	/*
+	 *  Decrement the new buffers counter.
+	 */
+	dma->new_buffers--;
+
+	/*
+	 * Set up the second buffer descriptor with a second buffer if we have
+	 * a second buffer.
+	 */
+	if (dma->new_buffers) {
+		outl( dma->buffer_queue[(dma->current_buffer + 1) %
+					MAX_EP93XX_DMA_BUFFERS].source,
+		      M2M_reg_base+M2M_OFFSET_SAR_BASE1 );
+
+		outl( dma->buffer_queue[(dma->current_buffer + 1) %
+					MAX_EP93XX_DMA_BUFFERS].dest,
+		      M2M_reg_base+M2M_OFFSET_DAR_BASE1 );
+
+		outl( dma->buffer_queue[(dma->current_buffer + 1) %
+					MAX_EP93XX_DMA_BUFFERS].size,
+		      M2M_reg_base+M2M_OFFSET_BCR1 );
+
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL |= CONTROL_M2M_NFBINTEN;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+
+		dma->new_buffers--;
+	}
+
+	/*
+	 *  Now we enable the channel.  This initiates the transfer.
+	 */
+	uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+	uiCONTROL |= CONTROL_M2M_ENABLE;
+	outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+	inl(M2M_reg_base + M2M_OFFSET_CONTROL);
+
+	/*
+	 *  If this is a memory to memory transfer, we need to s/w trigger the
+	 *  transfer by setting the start bit within the control register.
+	 */
+	if (dma->device == DMA_MEMORY) {
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL |= CONTROL_M2M_START;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+	}
+
+	DPRINTK("DMA - It's been started!!");
+	DPRINTK("CONTROL - 0x%x \n",	inl(M2M_reg_base+M2M_OFFSET_CONTROL) );
+	DPRINTK("STATUS - 0x%x \n",	 inl(M2M_reg_base+M2M_OFFSET_STATUS) );
+	DPRINTK("BCR0 - 0x%x \n",	   dma->buffer_queue[dma->current_buffer].size);
+	DPRINTK("SAR_BASE0 - 0x%x \n",  inl(M2M_reg_base+M2M_OFFSET_SAR_BASE0) );
+	DPRINTK("SAR_CUR0 - 0x%x \n",   inl(M2M_reg_base+M2M_OFFSET_SAR_CURRENT0) );
+	DPRINTK("DAR_BASE0 - 0x%x \n",  inl(M2M_reg_base+M2M_OFFSET_DAR_BASE0) );
+	DPRINTK("DAR_CUR0 - 0x%x \n",   inl(M2M_reg_base+M2M_OFFSET_DAR_CURRENT0) );
+
+	/*
+	 *  Unmask irqs
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  DMA interface functions
+ *
+ ****************************************************************************/
+
+/*****************************************************************************
+ *
+ *  int dma_init(int handle, unsigned int flags_m2p, unsigned int flags_m2m,
+ *			   dma_callback callback, unsigned int user_data)
+ *
+ *  Description: Configure the DMA channel and install a callback function.
+ *
+ *  handle:	 Handle unique the each instance of the dma interface, used
+ *			  to verify this call.
+ *  flags_m2p   Flags used to configure an M2P/P2M dma channel and determine
+ *			  if a callback function and user_data information are included
+ *			  in this call. This field should be NULL if handle represents
+ *			  an M2M channel.
+ *  flags_m2m   Flags used to configure an M2M dma channel and determine
+ *			  if a callback function and user_data information are included
+ *			  in this call. This field should be NULL if handle represents
+ *			  an M2P/P2M channel.
+ *  callback	function pointer which is called near the end of the
+ *			  dma channel's irq handler.
+ *  user_data   defined by the calling driver.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_config(int handle, unsigned int flags_m2p, unsigned int flags_m2m,
+		  dma_callback callback, unsigned int user_data)
+{
+	int  channel;
+	ep93xx_dma_t * dma;
+	unsigned long flags;
+	unsigned int M2P_reg_base, uiCONTROL;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR
+			   "DMA Config: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA Config \n");
+
+	dma = &dma_chan[channel];
+
+	local_irq_save(flags);
+
+	/*
+	 *  Check if the channel is currently transferring.
+	 */
+	if (dma->xfer_enable) {
+		local_irq_restore(flags);
+		return(-EINVAL);
+	}
+
+	/*
+	 *  Check if this is an m2m function.
+	 */
+	if (channel >= 10) {
+		local_irq_restore(flags);
+
+		/*
+		 *  Call another function to handle m2m config.
+		 */
+		return(dma_config_m2m(dma, flags_m2m, callback, user_data));
+	}
+
+	/*
+	 *  Setup a pointer into the dma channel's register set.
+	 */
+	M2P_reg_base = dma->reg_base;
+
+	/*
+	 *  By default we enable the stall interrupt.
+	 */
+	uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+	uiCONTROL |= CONTROL_M2P_STALLINTEN;
+	outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+	/*
+	 *  Configure the channel for an error from the peripheral.
+	 */
+	uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+	if ( flags_m2p && CHANNEL_ERROR_INT_ENABLE )
+		uiCONTROL |= CONTROL_M2P_CHERRORINTEN;
+	else
+		uiCONTROL &= ~CONTROL_M2P_CHERRORINTEN;
+	outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+	uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+	if ( flags_m2p && CHANNEL_ABORT )
+		uiCONTROL |= CONTROL_M2P_ABRT;
+	else
+		uiCONTROL &= ~CONTROL_M2P_ABRT;
+	outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+	uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+	if ( flags_m2p && IGNORE_CHANNEL_ERROR )
+		uiCONTROL |= CONTROL_M2P_ICE;
+	else
+		uiCONTROL &= ~CONTROL_M2P_ICE;
+	outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+
+	/*
+	 *  Save the callback function in the dma instance for this channel.
+	 */
+	dma->callback = callback;
+
+	/*
+	 *  Save the user data in the the dma instance for this channel.
+	 */
+	dma->user_data = user_data;
+
+	/*
+	 *  Put the dma instance into the pause state by setting the
+	 *  pause bit to true.
+	 */
+	dma->pause = TRUE;
+
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int dma_start(int handle, unsigned int channels, unsigned int * handles)
+ *
+ *  Description: Initiate a transfer on up to 3 channels.
+ *
+ *  handle:	 handle for the channel to initiate transfer on.
+ *  channels:   number of channels to initiate transfers on.
+ *  handles:	pointer to an array of handles, one for each channel which
+ *			   is to be started.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_start(int handle, unsigned int channels, unsigned int * handles)
+{
+	ep93xx_dma_t * dma_pointers[3];
+	unsigned int M2P_reg_bases[3];
+	unsigned int loop, uiCONTROL;
+	unsigned long flags;
+	int  channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Start: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	if (channels < 1) {
+		printk(KERN_ERR "DMA Start: Invalid parameter.\n");
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA Start \n");
+
+	/*
+	 *  Mask off registers.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Check if this is a start multiple.
+	 */
+	if (channels > 1) {
+		DPRINTK("DMA ERROR: Start, multiple start not supported yet \n");
+		return(-1);
+	} else {
+		/*
+		 *  Check if this channel is already transferring.
+		 */
+		if (dma_chan[channel].xfer_enable && !dma_chan[channel].pause) {
+			printk(KERN_ERR
+				   "DMA Start: Invalid command for channel %d.\n", channel);
+
+			/*
+			 *  Unmask irqs
+			 */
+			local_irq_restore(flags);
+
+			/*
+			 *  This channel is already transferring, so return an error.
+			 */
+			return(-EINVAL);
+		}
+
+		/*
+		 *  If this is an M2M channel, call a different function.
+		 */
+		if (channel >= 10) {
+			/*
+			 *  Unmask irqs
+			 */
+			local_irq_restore(flags);
+
+			/*
+			 *  Call the m2m start function.  Only start one channel.
+			 */
+			return(dma_start_m2m(channel, &dma_chan[channel]));
+		}
+
+		/*
+		 *  Make sure the channel has at least one buffer in the queue.
+		 */
+		if (dma_chan[channel].new_buffers < 1) {
+			DPRINTK("DMA Start: Channel starved.\n");
+
+			/*
+			 *  This channel does not have enough buffers queued up,
+			 *  so enter the pause by starvation state.
+			 */
+			dma_chan[channel].xfer_enable = TRUE;
+			dma_chan[channel].pause = TRUE;
+
+			/*
+			 *  Unmask irqs
+			 */
+			local_irq_restore(flags);
+
+			/*
+			 *  Success.
+			 */
+			return(0);
+		}
+
+		/*
+		 *  Set up a dma instance pointer for this dma channel.
+		 */
+		dma_pointers[0] = &dma_chan[channel];
+
+		/*
+		 * Set up a pointer to the register set for this channel.
+		 */
+		M2P_reg_bases[0] = dma_pointers[0]->reg_base;
+	}
+
+	/*
+	 *  Setup both MAXCNT registers with values from the next two buffers
+	 *  in the queue, and enable the next frame buffer interrupt on the channel.
+	 */
+	for (loop = 0; loop < channels; loop++) {
+		/*
+		 *  Check if we need to restore a paused transfer.
+		 */
+		if (dma_pointers[loop]->pause_buf.buf_id != -1)
+			outl( dma_pointers[loop]->pause_buf.size,
+			      M2P_reg_bases[loop]+M2P_OFFSET_MAXCNT0 );
+		else
+			outl( dma_pointers[loop]->buffer_queue[dma_pointers[loop]->current_buffer].size,
+			      M2P_reg_bases[loop]+M2P_OFFSET_MAXCNT0 );
+	}
+
+	for (loop = 0; loop < channels; loop++) {
+		/*
+		 *  Enable the specified dma channels.
+		 */
+		uiCONTROL = inl(M2P_reg_bases[loop]+M2P_OFFSET_CONTROL);
+		uiCONTROL |= CONTROL_M2P_ENABLE;
+		outl( uiCONTROL, M2P_reg_bases[loop]+M2P_OFFSET_CONTROL );
+
+		/*
+		 *  Update the dma channel instance transfer state.
+		 */
+		dma_pointers[loop]->xfer_enable = TRUE;
+		dma_pointers[loop]->pause = FALSE;
+	}
+
+	/*
+	 *  Program up the BASE0 registers for all specified channels, this
+	 *  will initiate transfers on all specified channels.
+	 */
+	for (loop = 0; loop < channels; loop++)
+		/*
+		 *  Check if we need to restore a paused transfer.
+		 */
+		if (dma_pointers[loop]->pause_buf.buf_id != -1) {
+			outl( dma_pointers[loop]->pause_buf.source,
+			      M2P_reg_bases[loop]+M2P_OFFSET_BASE0 );
+
+			/*
+			 *  Set the pause buffer to NULL
+			 */
+			dma_pointers[loop]->pause_buf.buf_id = -1;
+			dma_pointers[loop]->pause_buf.size = 0;
+		} else if(dma_pointers[loop]->new_buffers){
+			outl( dma_pointers[loop]->buffer_queue[
+				  dma_pointers[loop]->current_buffer].source,
+			      M2P_reg_bases[loop]+M2P_OFFSET_BASE0 );
+            dma_pointers[loop]->new_buffers--;
+
+          }
+
+	/*
+	 *  Before restoring irqs setup the second MAXCNT/BASE
+	 *  register with a second buffer.
+	 */
+	for (loop = 0; loop < channels; loop++)
+		if (dma_pointers[loop]->new_buffers) {
+        	/*
+        	 *  By default we enable the next frame buffer interrupt.
+        	 */
+        	uiCONTROL = inl(M2P_reg_bases[loop]+M2P_OFFSET_CONTROL);
+        	uiCONTROL |= CONTROL_M2P_NFBINTEN;
+        	outl( uiCONTROL, M2P_reg_bases[loop]+M2P_OFFSET_CONTROL );
+
+			outl( dma_pointers[loop]->buffer_queue[
+				  (dma_pointers[loop]->current_buffer + 1) %
+				  MAX_EP93XX_DMA_BUFFERS].size,
+			      M2P_reg_bases[loop]+M2P_OFFSET_MAXCNT1 );
+
+			outl( dma_pointers[loop]->buffer_queue[
+				  (dma_pointers[loop]->current_buffer + 1) %
+				  MAX_EP93XX_DMA_BUFFERS].source,
+			      M2P_reg_bases[loop]+M2P_OFFSET_BASE1 );
+            dma_pointers[loop]->new_buffers--;
+		}
+
+	/*
+	  DPRINTK("DMA - It's been started!!");
+	  DPRINTK("STATUS - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_STATUS) );
+	  DPRINTK("CONTROL - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_CONTROL) );
+	  DPRINTK("REMAIN - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_REMAIN) );
+	  DPRINTK("PPALLOC - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_PPALLOC) );
+	  DPRINTK("BASE0 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE0) );
+	  DPRINTK("MAXCNT0 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT0) );
+	  DPRINTK("CURRENT0 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT0) );
+	  DPRINTK("BASE1 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE1) );
+	  DPRINTK("MAXCNT1 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT1) );
+	  DPRINTK("CURRENT1 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT1) );
+
+	  DPRINTK("Pause - %d \n", dma_pointers[0]->pause);
+	  DPRINTK("xfer_enable - %d \n", dma_pointers[0]->xfer_enable);
+	  DPRINTK("total bytes - 0x%x \n", dma_pointers[0]->total_bytes);
+	  DPRINTK("total buffer - %d \n", dma_pointers[0]->total_buffers);
+	  DPRINTK("new buffers - %d \n", dma_pointers[0]->new_buffers);
+	  DPRINTK("current buffer - %d \n", dma_pointers[0]->current_buffer);
+	  DPRINTK("last buffer - %d \n", dma_pointers[0]->last_buffer);
+	  DPRINTK("used buffers - %d \n", dma_pointers[0]->used_buffers);
+	*/
+	/*
+	 *  Unmask irqs
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_add_buffer(int handle, unsigned int * address,
+ *						 unsigned int size, unsigned int last)
+ *
+ *  Description: Add a buffer entry to the DMA buffer queue.
+ *
+ *  handle:	 handle for the channel to add this buffer to.
+ *  address:	Pointer to an integer which is the start address of the
+ *			  buffer which is to be added to the queue.
+ *  size:	   size of the buffer in bytes.
+ *  last:	   1 if this is the last buffer in this stream, 0 otherwise.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_add_buffer(int handle, unsigned int source, unsigned int dest,
+		      unsigned int size, unsigned int last,
+		      unsigned int buf_id)
+{
+	unsigned long flags;
+	ep93xx_dma_t * dma;
+	int  channel;
+#if 0
+	static int peak_total_buffers=0;
+#endif
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR
+			   "DMA Add Buffer: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	/*
+	 *  Get a pointer to the dma instance.
+	 */
+	dma = &dma_chan[channel];
+
+#if 0
+	if( dma->total_buffers > peak_total_buffers )
+	{
+	    peak_total_buffers=dma->total_buffers;
+	    printk("peak_total_buffers=%d\n", peak_total_buffers );
+	}
+#endif
+	/*
+	 *  Mask interrupts and hold on to the original state.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  If the buffer queue is full, last_buffer is the same as current_buffer and
+	 *  we're not tranfering, or last_buffer is pointing to a used buffer, then exit.
+	 *  TODO: do I need to do any more checks?
+	 */
+	if (dma->total_buffers >= MAX_EP93XX_DMA_BUFFERS)
+	{
+		DPRINTK("too many dma buffers: MAX_EP93XX_DMA_BUFFERS set to low ?\n");
+		/*
+		 *  Restore the state of the irqs
+		 */
+		local_irq_restore(flags);
+
+		/*
+		 *  Fail.
+		 */
+		return(-1);
+	}
+
+	/*
+	 *  Add this buffer to the queue
+	 */
+	dma->buffer_queue[dma->last_buffer].source = source;
+	dma->buffer_queue[dma->last_buffer].dest = dest;
+	dma->buffer_queue[dma->last_buffer].size = size;
+	dma->buffer_queue[dma->last_buffer].last = last;
+	dma->buffer_queue[dma->last_buffer].buf_id = buf_id;
+
+	/*
+	 *  Reset the used field of the buffer structure.
+	 */
+	dma->buffer_queue[dma->last_buffer].used = FALSE;
+
+	/*
+	 *  Increment the End Item Pointer.
+	 */
+	dma->last_buffer = (dma->last_buffer + 1) % MAX_EP93XX_DMA_BUFFERS;
+
+	/*
+	 *  Increment the new buffers counter and the total buffers counter
+	 */
+	dma->new_buffers++;
+	dma->total_buffers++;
+
+	/*
+	 *  restore the interrupt state.
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Check if the channel was starved into a stopped state.
+	 */
+	if (dma->pause && dma->xfer_enable) {
+		if (dma->new_buffers >= 1) {
+			DPRINTK("DMA - calling start from add after starve. \n");
+
+			/*
+			 *  The channel was starved into a stopped state, and we've got
+			 *  2 new buffers, so start tranferring again.
+			 */
+			ep93xx_dma_start(handle, 1, 0);
+		}
+	}
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_remove_buffer(int handle, unsigned int * address,
+ *								unsigned int * size)
+ *
+ *  Description: Remove a buffer entry from the DMA buffer queue. If
+ *			   buffer was removed successfully, return 0, otherwise
+ *			   return -1.
+ *
+ *  handle:	 handle for the channel to remove a buffer from.
+ *  address:	Pointer to an integer which is filled in with the start
+ *			  address of the removed buffer.
+ *  size:	   Pointer to an integer which is filled in with the size in
+ *			  bytes of the removed buffer.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_remove_buffer(int handle, unsigned int * buf_id)
+{
+	unsigned int test;
+	unsigned int loop;
+	int return_val = -1;
+	unsigned long flags;
+	ep93xx_dma_t *dma;
+	int  channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR
+			   "DMA Remove Buffer: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	dma = &dma_chan[channel];
+
+	/*
+	 *  Mask interrupts and hold on to the original state.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Make sure there are used buffers to be returned.
+	 */
+	if (dma->used_buffers) {
+		test = dma->last_buffer;
+
+		for (loop = 0; loop < MAX_EP93XX_DMA_BUFFERS; loop++) {
+			if (dma->buffer_queue[test].used && (dma->buffer_queue[test].buf_id != -1)) {
+				/*DPRINTK("buffer %d used \n", test); */
+
+				/*
+				 *  This is a used buffer, fill in the buf_id pointer
+				 *  with the buf_id for this buffer.
+				 */
+				*buf_id = dma->buffer_queue[test].buf_id;
+
+				/*
+				 *  Reset this buffer structure
+				 */
+				dma->buffer_queue[test].buf_id = -1;
+
+				/*
+				 *  Decrement the used buffer counter, and the total buffer counter.
+				 */
+				dma->used_buffers--;
+				dma->total_buffers--;
+
+				/*
+				 *  Successful removal of a buffer, so set the return
+				 *  value to 0, then exit this loop.
+				 */
+				return_val = 0;
+				break;
+			}
+
+			/*
+			 *  This buffer isn't used, let's see if the next one is.
+			 */
+			test = (test + 1) % MAX_EP93XX_DMA_BUFFERS;
+		}
+	}
+
+	/*
+	 *  Restore interrupts.
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(return_val);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_pause(int handle, unsigned int channels,
+ *					   unsigned int * handles)
+ *
+ *  Description: Disable any ongoing transfer for the given channel, retaining
+ *			   the state of the current buffer transaction so that upon
+ *			   resume, the dma will continue where it left off.
+ *
+ *  handle:	 Handle for the channel to be paused.  If this is a pause for
+ *			  for multiple channels, handle is a valid handle for one of
+ *			  the channels to be paused.
+ *  channels:   number of channel to pause transfers on.
+ *  handles:	Pointer to an array of handles, one for each channel which
+ *			  to be paused.  If this pause is intended only for one
+ *			  channel, this field should be set to NULL.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_pause(int handle, unsigned int channels, unsigned int * handles)
+{
+	unsigned long flags;
+	ep93xx_dma_t * dma;
+	int channel;
+
+	DPRINTK("ep93xx_dma_pause \n");
+
+	/*
+	 *  Mask interrupts and hold on to the original state.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		/*
+		 *  restore interrupts.
+		 */
+		local_irq_restore(flags);
+
+		printk(KERN_ERR
+			   "DMA Pause: Invalid dma handle.\n");
+
+		/*
+		 *  Fail.
+		 */
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA %d: pause \n", channel);
+
+	/*
+	 *  Set up a pointer to the dma instance data.
+	 */
+	dma = &dma_chan[channel];
+
+	/*
+	 *  Check if we're already paused.
+	 */
+	if (dma->pause) {
+		/*
+		 *  We're paused, but are we stopped?
+		 */
+		if (dma->xfer_enable)
+			/*
+			 *  Put the channel in the stopped state.
+			 */
+			dma->xfer_enable = FALSE;
+
+		DPRINTK("DMA Pause - already paused.");
+	} else {
+		/*
+		 *  Put the channel into the stopped state.
+		 */
+		dma->xfer_enable = FALSE;
+		dma->pause = TRUE;
+	}
+
+	/*
+	 *  restore interrupts.
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Already paused, so exit.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  void ep93xx_dma_flush(int handle)
+ *
+ *  Description: Flushes all queued buffers and transfers in progress
+ *			   for the given channel.  Return the buffer entries
+ *			   to the calling function.
+ *
+ *  handle:	 handle for the channel for which the flush is intended.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_flush(int handle)
+{
+	unsigned int loop;
+	unsigned long flags;
+	ep93xx_dma_t * dma;
+	int  channel;
+	unsigned int M2P_reg_base,uiCONTROL;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Flush: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA %d: flush \n", channel);
+
+	/*
+	 *  Set up a pointer to the dma instance data for this channel
+	 */
+	dma = &dma_chan[channel];
+
+	/*
+	 *  Mask interrupts and hold on to the original state.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  Disable the dma channel
+	 */
+	if (channel < 10) {
+		/*
+		 *  M2P channel
+		 */
+		uiCONTROL = inl(dma->reg_base+M2P_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2P_ENABLE;
+		outl( uiCONTROL, dma->reg_base+M2P_OFFSET_CONTROL );
+	} else {
+		/*
+		 *  M2M channel
+		 */
+		uiCONTROL = inl(dma->reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2M_ENABLE;
+		outl( uiCONTROL, dma->reg_base+M2M_OFFSET_CONTROL );
+	}
+
+	for (loop = 0; loop < MAX_EP93XX_DMA_BUFFERS; loop++)
+	{
+		dma->buffer_queue[loop].buf_id = -1;
+		dma->buffer_queue[loop].last = 0;
+	}
+
+	/*
+	 *  Set the Current and Last item to zero.
+	 */
+	dma->current_buffer = 0;
+	dma->last_buffer = 0;
+
+	/*
+	 *  Reset the Buffer counters
+	 */
+	dma->used_buffers = 0;
+	dma->new_buffers = 0;
+	dma->total_buffers = 0;
+
+	/*
+	 *  reset the Total bytes counter.
+	 */
+	dma->total_bytes = 0;
+
+    /*
+     * Reset the paused buffer.
+     */
+     dma->pause_buf.last = 0;
+     dma->pause_buf.buf_id = -1;
+
+	M2P_reg_base = dma_chan[channel].reg_base;
+
+	/*
+	 *  restore interrupts.
+	 */
+	local_irq_restore(flags);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_queue_full(int handle)
+ *
+ *  Description: Query to determine if the DMA queue of buffers for
+ *			  a given channel is full.
+ *			  0 = queue is full
+ *			  1 = queue is not full
+ *
+ *  handle:	 handle for the channel to query.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_queue_full(int handle)
+{
+	int list_full = 0;
+	unsigned long flags;
+	int  channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Queue Full: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA %d: queue full \n", channel);
+
+	/*
+	 *  Mask interrupts and hold on to the original state.
+	 */
+	local_irq_save(flags);
+
+	/*
+	 *  If the last item is equal to the used item then
+	 *  the queue is full.
+	 */
+	if (dma_chan[channel].total_buffers < MAX_EP93XX_DMA_BUFFERS)
+		list_full =  FALSE;
+	else
+		list_full = TRUE;
+
+	/*
+	 *  restore interrupts.
+	 */
+	local_irq_restore(flags);
+
+	return(list_full);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_get_position()
+ *
+ *  Description:  Takes two integer pointers and fills them with the start
+ *                and current address of the buffer currently transferring
+ *                on the specified DMA channel.
+ *
+ *  handle         handle for the channel to query.
+ *  *buf_id        buffer id for the current buffer transferring on the
+ *                 dma channel.
+ *  *total         total bytes transferred on the channel.  Only counts
+ *                 whole buffers transferred.
+ *  *current_frac  number of bytes transferred so far in the current buffer.
+ ****************************************************************************/
+int
+ep93xx_dma_get_position(int handle, unsigned int * buf_id,
+                        unsigned int * total, unsigned int * current_frac )
+{
+	int  channel;
+	ep93xx_dma_t * dma;
+	unsigned int buf_id1, total1, current_frac1, buf_id2, total2;
+	unsigned int Status, NextBuffer, StateIsBufNext, M2P_reg_base=0;
+	unsigned int pause1, pause2;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.  See if this is a
+	 *  valid handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Get Position: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	dma = &dma_chan[channel];
+
+	/*
+	 * If DMA moves to a new buffer in the middle of us grabbing the
+	 * buffer info, then do it over again.
+	 */
+	do{
+		buf_id1 = dma->buffer_queue[dma->current_buffer].buf_id;
+		total1  = dma->total_bytes;
+		pause1  = dma->pause;
+
+		if (channel < 10) {
+			// M2P
+			M2P_reg_base = dma->reg_base;
+
+			Status = inl(M2P_reg_base+M2P_OFFSET_STATUS);
+
+			NextBuffer = ((Status & STATUS_M2P_NEXTBUFFER) != 0);
+
+			StateIsBufNext = ((Status & STATUS_M2P_CURRENT_MASK) ==
+			                  STATUS_M2P_DMA_BUF_NEXT);
+
+			if( NextBuffer ^ StateIsBufNext )
+				current_frac1 = inl(M2P_reg_base+M2P_OFFSET_CURRENT1) -
+				                inl(M2P_reg_base+M2P_OFFSET_BASE1);
+			else
+				current_frac1 = inl(M2P_reg_base+M2P_OFFSET_CURRENT0) -
+				                inl(M2P_reg_base+M2P_OFFSET_BASE0);
+
+		} else {
+			// M2M - TODO implement this for M2M
+			current_frac1 = 0;
+		}
+
+		buf_id2 = dma->buffer_queue[dma->current_buffer].buf_id;
+		total2 = dma->total_bytes;
+		pause2  = dma->pause;
+
+	} while ( (buf_id1 != buf_id2) || (total1 != total2) || (pause1 != pause2) );
+
+	if (pause1)
+		current_frac1 = 0;
+
+	if (buf_id)
+		*buf_id = buf_id1;
+
+	if (total)
+		*total  = total1;
+
+	if (current_frac)
+		*current_frac = current_frac1;
+
+//	DPRINTK("DMA buf_id %d, total %d, frac %d\n", buf_id1, total1, current_frac1);
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_get_total(int handle)
+ *
+ *  Description:	Returns the total number of bytes transferred on the
+ *			specified channel since the channel was requested.
+ *
+ *  handle:	 handle for the channel to query.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_get_total(int handle)
+{
+	int  channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Get Total: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	DPRINTK("DMA %d: total: %d \n", channel, dma_chan[channel].total_bytes);
+
+	/*
+	 *  Return the total number of bytes transferred on this channel since
+	 *  it was requested.
+	 */
+	return(dma_chan[channel].total_bytes);
+}
+
+/*****************************************************************************
+ *
+ *  int ep93xx_dma_is_done(int handle)
+ *
+ *  Description:	Determines if the specified channel is done
+ *			transferring the requested data.
+ *
+ *  handle:	 handle for the channel to query.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_is_done(int handle)
+{
+	ep93xx_dma_t *dma;
+	int channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "ep93xx_dma_is_done: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+        /*
+         * Get a pointer to the DMA channel state structure.
+         */
+        dma = &dma_chan[channel];
+
+        /*
+         * See if there are any buffers remaining to be provided to the HW.
+         */
+        if (dma->new_buffers)
+            return 0;
+
+        /*
+         * See if this is a M2P or M2M channel.
+         */
+        if (channel < 10) {
+            /*
+             * If the bytes remaining register of the HW is not zero, then
+             * there is more work to be done.
+             */
+            if (inl(dma->reg_base + M2P_OFFSET_REMAIN) != 0)
+                return 0;
+        } else {
+            /*
+             * If either byte count register in the HW is not zero, then there
+             * is more work to be done.
+             */
+            if ((inl(dma->reg_base + M2M_OFFSET_BCR0) != 0) ||
+                (inl(dma->reg_base + M2M_OFFSET_BCR1) != 0))
+                return 0;
+        }
+
+        /*
+         * The DMA is complete.
+         */
+        return 1;
+}
+
+/*****************************************************************************
+ * ep93xx_dma_request
+ *
+ * Description: This function will allocate a DMA channel for a particular
+ * hardware peripheral.  Before initiating a transfer on the allocated
+ * channel, the channel must be set up and buffers have to queued up.
+ *
+ *  handle:	 pointer to an integer which is filled in with a unique
+ *			  handle for this instance of the dma interface.
+ *  device_id   string with the device name, primarily used by /proc.
+ *  device	  hardware device ID for which the requested dma channel will
+ *			  transfer data.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_request(int * handle, const char *device_id,
+				   ep93xx_dma_dev_t device)
+{
+	ep93xx_dma_t *dma = NULL;
+	int channel;
+	unsigned int error = 0;
+	unsigned int loop;
+	unsigned int M2P_reg_base;
+
+	/*
+	 *  Check if the device requesting a DMA channel is a valid device.
+	 */
+	if ((device >= UNDEF_DMA) || (device < 0))
+		return(-ENODEV);
+
+	/*
+	 *  We've got a valid hardware device requesting a DMA channel.
+	 *  Now check if the device should open an M2P or M2M channel
+	 */
+	if (device < 20)
+		channel = dma_open_m2p(device);
+	else
+		channel = dma_open_m2m(device);
+
+	/*
+	 *  Check if we successfully opened a DMA channel
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "%s: Could not open dma channel for this device.\n",
+			   device_id);
+		return(-EBUSY);
+	}
+
+	dma = &dma_chan[channel];
+
+        if(dma->terminated==1) {
+           free_irq(dma->irq, (void *) dma);
+           dma->terminated=0;
+        }
+
+	/*
+	 *  Request the appropriate IRQ for the specified channel
+	 */
+	if (channel < 10)
+		error = request_irq(dma->irq, dma_m2p_irq_handler,
+				    IRQF_DISABLED, device_id, (void *) dma);
+	else
+		error = request_irq(dma->irq, &dma_m2m_irq_handler,
+				    IRQF_DISABLED, device_id, (void *) dma);
+
+	/*
+	 *  Check for any errors during the irq request
+	 */
+	if (error) {
+		printk(KERN_ERR "%s: unable to request IRQ %d for DMA channel\n",
+			   device_id, dma->irq);
+		return(error);
+	}
+
+	/*
+	 *  Generate a valid handle and exit.
+	 *
+	 *  Increment the last valid handle.
+	 *  Check for wraparound (unlikely, but we like to be complete).
+	 */
+	dma->last_valid_handle++;
+
+	if ( (dma->last_valid_handle & DMA_HANDLE_SPECIFIER_MASK) !=
+	     (channel << 28) )
+		dma->last_valid_handle = (channel << 28) + 1;
+
+	/*
+	 *  Fill in the handle pointer with a valid handle for
+	 *  this dma channel instance.
+	 */
+	*handle = dma->last_valid_handle;
+
+	DPRINTK("Handle for channel %d: 0x%x\n", channel, *handle);
+
+	/*
+	 * Save the device ID and device name.
+	 */
+	dma->device = device;
+	dma->device_id = device_id;
+
+	/*
+	 *  Init all fields within the dma instance.
+	 */
+	for (loop = 0; loop < MAX_EP93XX_DMA_BUFFERS; loop++)
+		dma->buffer_queue[loop].buf_id = -1;
+
+	/*
+	 *  Initialize all buffer queue variables.
+	 */
+	dma->current_buffer = 0;
+	dma->last_buffer = 0;
+
+	dma->new_buffers = 0;
+	dma->used_buffers = 0;
+	dma->total_buffers = 0;
+
+	/*
+	 *  Initialize the total bytes variable
+	 */
+	dma->total_bytes = 0;
+
+	/*
+	 *  Initialize the transfer and pause state variables to 0.
+	 */
+	dma->xfer_enable = 0;
+
+	dma->pause = 0;
+
+	/*
+	 *  Initialize the pause buffer structure.
+	 */
+	dma->pause_buf.buf_id = -1;
+
+	/*
+	 *  Initialize the callback function and user data fields.
+	 */
+	dma->callback = NULL;
+
+	/*
+	 * User data used as a parameter for the Callback function.  The user
+	 * sets up the data and sends it with the callback function.
+	 */
+	dma->user_data = 0;
+
+	M2P_reg_base = dma_chan[channel].reg_base;
+
+	/*
+	 *  Debugging message.
+	 */
+	DPRINTK("Successfully requested dma channel %d\n", channel);
+	DPRINTK("STATUS - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_STATUS) );
+	DPRINTK("CONTROL - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_CONTROL) );
+	DPRINTK("REMAIN - 0x%x \n",	 inl(M2P_reg_base+M2P_OFFSET_REMAIN) );
+	DPRINTK("PPALLOC - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_PPALLOC) );
+	DPRINTK("BASE0 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE0) );
+	DPRINTK("MAXCNT0 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT0) );
+	DPRINTK("CURRENT0 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT0) );
+	DPRINTK("BASE1 - 0x%x \n",	  inl(M2P_reg_base+M2P_OFFSET_BASE1) );
+	DPRINTK("MAXCNT1 - 0x%x \n",	inl(M2P_reg_base+M2P_OFFSET_MAXCNT1) );
+	DPRINTK("CURRENT1 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT1) );
+
+	DPRINTK("Buffer	source	   size	   last	   used \n");
+	for (loop = 0; loop < 5; loop ++)
+		DPRINTK("%d		0x%x		 0x%x		%d		 %d \n",
+			loop, dma->buffer_queue[loop].source, dma->buffer_queue[loop].size,
+			dma->buffer_queue[loop].last, dma->buffer_queue[loop].used);
+	DPRINTK("pause	 0x%x		 0x%x		%d		 %d \n",
+		dma->pause_buf.source, dma->pause_buf.size,
+		dma->pause_buf.last, dma->pause_buf.used);
+
+	DPRINTK("Pause - %d \n", dma->pause);
+	DPRINTK("xfer_enable - %d \n", dma->xfer_enable);
+	DPRINTK("total bytes - 0x%x \n", dma->total_bytes);
+	DPRINTK("total buffer - %d \n", dma->total_buffers);
+	DPRINTK("new buffers - %d \n", dma->new_buffers);
+	DPRINTK("current buffer - %d \n", dma->current_buffer);
+	DPRINTK("last buffer - %d \n", dma->last_buffer);
+	DPRINTK("used buffers - %d \n", dma->used_buffers);
+
+	DPRINTK("CURRENT1 - 0x%x \n",   inl(M2P_reg_base+M2P_OFFSET_CURRENT1) );
+	DPRINTK("VIC0IRQSTATUS - 0x%x, VIC0INTENABLE - 0x%x \n",
+		*(unsigned int *)(VIC0IRQSTATUS),
+		*(unsigned int *)(VIC0INTENABLE));
+
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ * ep93xx_dma_free
+ *
+ * Description: This function will free the dma channel for future requests.
+ *
+ *  handle:	 handle for the channel to be freed.
+ *
+ ****************************************************************************/
+int
+ep93xx_dma_free(int handle)
+{
+	ep93xx_dma_t *dma;
+	unsigned int M2M_reg_base, M2P_reg_base, uiCONTROL;
+	int channel;
+
+	/*
+	 *  Get the DMA hw channel # from the handle.
+	 */
+	channel = dma_get_channel_from_handle(handle);
+
+	/*
+	 *  See if this is a valid handle.
+	 */
+	if (channel < 0) {
+		printk(KERN_ERR "DMA Free: Invalid dma handle.\n");
+		return(-EINVAL);
+	}
+
+	/*
+	 *  Get a pointer to the dma instance.
+	 */
+	dma = &dma_chan[channel];
+
+	/*
+	 *  Disable the dma channel
+	 */
+	if (channel < 10) {
+		/*
+		 *  M2P channel
+		 */
+		M2P_reg_base = dma->reg_base;
+
+		uiCONTROL = inl(M2P_reg_base+M2P_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2P_ENABLE;
+		outl( uiCONTROL, M2P_reg_base+M2P_OFFSET_CONTROL );
+	} else {
+		/*
+		 *  M2M channel
+		 */
+		M2M_reg_base = dma->reg_base;
+
+		uiCONTROL = inl(M2M_reg_base+M2M_OFFSET_CONTROL);
+		uiCONTROL &= ~CONTROL_M2M_ENABLE;
+		outl( uiCONTROL, M2M_reg_base+M2M_OFFSET_CONTROL );
+	}
+
+	/*
+	 *  Free the interrupt servicing this dma channel
+	 */
+	//free_irq(dma->irq, (void *) dma);
+        dma->terminated=1;
+
+	/*
+	 *  Decrement the reference count for this instance of the dma interface
+	 */
+	dma->ref_count--;
+
+	/*
+	 *  Set the transfer and pause state variables to 0
+	 *  (unititialized state).
+	 */
+	dma->xfer_enable = 0;
+	dma->pause = 0;
+
+	/*
+	 *  Debugging message.
+	 */
+	DPRINTK("Successfully freed dma channel %d\n", channel);
+	/*
+	 *  Success.
+	 */
+	return(0);
+}
+
+/*****************************************************************************
+ *
+ * ep93xx_dma_init(void)
+ *
+ * Description: This function is called during system initialization to
+ * setup the interrupt number and register set base address for each DMA
+ * channel.
+ *
+ ****************************************************************************/
+static int __init
+ep93xx_dma_init(void)
+{
+	int channel;
+
+	/*
+	 * Init some values in each dma instance.
+	 */
+	for (channel = 0; channel < MAX_EP93XX_DMA_CHANNELS; channel++) {
+		/*
+		 *  IRQ for the specified dma channel.
+		 */
+		dma_chan[channel].irq = IRQ_EP93XX_DMAM2P0 + channel;
+
+                 dma_chan[channel].terminated = 0;
+
+		/*
+		 *  Initial value of the dma channel handle.
+		 */
+		dma_chan[channel].last_valid_handle = channel << 28;
+
+		/*
+		 *  Give the instance a pointer to the dma channel register
+		 *  base.
+		 */
+		if (channel < 10)
+			dma_chan[channel].reg_base = DMAM2PChannelBase[channel];
+		else
+			dma_chan[channel].reg_base = DMAM2MChannelBase[channel - 10];
+
+		/*
+		 *  Initialize the reference count for this channel.
+		 */
+		dma_chan[channel].ref_count = 0;
+	}
+
+	DPRINTK("DMA Interface intitialization complete\n");
+
+	/*
+	 * Success
+	 */
+	return 0;
+}
+
+arch_initcall(ep93xx_dma_init);
+
+EXPORT_SYMBOL(ep93xx_dma_free);
+EXPORT_SYMBOL(ep93xx_dma_request);
+EXPORT_SYMBOL(ep93xx_dma_flush);
+EXPORT_SYMBOL(ep93xx_dma_pause);
+EXPORT_SYMBOL(ep93xx_dma_remove_buffer);
+EXPORT_SYMBOL(ep93xx_dma_add_buffer);
+EXPORT_SYMBOL(ep93xx_dma_start);
+EXPORT_SYMBOL(ep93xx_dma_config);
--- /dev/null
+++ b/arch/arm/mach-ep93xx/dma_ep93xx.h
@@ -0,0 +1,676 @@
+/*****************************************************************************
+ *
+ * arch/arm/mach-ep93xx/dma_ep93xx.h
+ *
+ * DESCRIPTION:    93XX DMA controller API private defintions.
+ *
+ * Copyright Cirrus Logic Corporation, 2003.  All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License 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
+ *
+ ****************************************************************************/
+#ifndef _EP93XX_DMA_H_
+#define _EP93XX_DMA_H_
+
+// as it turns out the ide dma is the biggest dma buffer hog so far
+// in case the HDD is "thinking" (seek/buffer flush)
+// the continueing r/w DMAs to the HDD will be queued up to up to PRD_ENTRIES entries...
+#include <linux/ide.h>
+#define MAX_EP93XX_DMA_BUFFERS      PRD_ENTRIES
+
+#ifndef TRUE
+#define TRUE                        1
+#endif
+
+#ifndef FALSE
+#define FALSE                       0
+#endif
+
+#ifndef NULL
+#define NULL                        0
+#endif
+
+#define EP93XX_DMA_BASE			(EP93XX_AHB_VIRT_BASE + 0x00000000)
+
+/*****************************************************************************
+ * 0x8000.0000 -> 0x8000.003C M2P Channel 0 Registers (Tx)
+ * 0x8000.0040 -> 0x8000.007C M2P Channel 1 Registers (Rx)
+ * 0x8000.0080 -> 0x8000.00BC M2P Channel 2 Registers (Tx)
+ * 0x8000.00C0 -> 0x8000.00FC M2P Channel 3 Registers (Rx)
+ * 0x8000.0100 -> 0x8000.013C M2M Channel 0 Registers
+ * 0x8000.0140 -> 0x8000.017C M2M Channel 1 Registers
+ * 0x8000.0180 -> 0x8000.01BC Not Used
+ * 0x8000.01C0 -> 0x8000.01FC Not Used
+ * 0x8000.0200 -> 0x8000.023C M2P Channel 5 Registers (Rx)
+ * 0x8000.0240 -> 0x8000.027C M2P Channel 4 Registers (Tx)
+ * 0x8000.0280 -> 0x8000.02BC M2P Channel 7 Registers (Rx)
+ * 0x8000.02C0 -> 0x8000.02FC M2P Channel 6 Registers (Tx)
+ * 0x8000.0300 -> 0x8000.033C M2P Channel 9 Registers (Rx)
+ * 0x8000.0340 -> 0x8000.037C M2P Channel 8 Registers (Tx)
+ * 0x8000.0380 DMA Channel Arbitration register
+ * 0x8000.03C0 DMA Global Interrupt register
+ * 0x8000.03C4 -> 0x8000.03FC Not Used
+ *
+ *
+ * Internal M2P/P2M Channel Register Map
+ *
+ * Offset Name      Access  Bits Reset Value
+ * 0x00   CONTROL   R/W     6    0
+ * 0x04   INTERRUPT R/W TC* 3    0
+ * 0x08   PPALLOC   R/W     4    channel dependant
+ *                               (see reg description)
+ * 0x0C   STATUS    RO      8    0
+ * 0x10   reserved
+ * 0x14   REMAIN    RO      16   0
+ * 0X18   Reserved
+ * 0X1C   Reserved
+ * 0x20   MAXCNT0   R/W     16   0
+ * 0x24   BASE0     R/W     32   0
+ * 0x28   CURRENT0  RO      32   0
+ * 0x2C   Reserved
+ * 0x30   MAXCNT1   R/W     16   0
+ * 0x34   BASE1     R/W     32   0
+ * 0X38   CURRENT1  RO      32   0
+ * 0X3C   Reserved
+ *
+ * M2M Channel Register Map
+ * Offset Name         Access   Bits Reset Value
+ *
+ * 0x00   CONTROL      R/W      22   0
+ * 0x04   INTERRUPT    R/W TC*  3    0
+ * 0x08   Reserved
+ * 0x0C   STATUS       R/W TC*  14   0
+ * 0x10   BCR0         R/W      16   0
+ * 0x14   BCR1         R/W      16   0
+ * 0x18   SAR_BASE0    R/W      32   0
+ * 0x1C   SAR_BASE1    R/W      32   0
+ * 0x20   Reserved
+ * 0x24   SAR_CURRENT0 RO       32   0
+ * 0x28   SAR_CURRENT1 RO       32   0
+ * 0x2C   DAR_BASE0    R/W      32   0
+ * 0x30   DAR_BASE1    R/W      32   0
+ * 0x34   DAR_CURRENT0 RO       32   0
+ * 0X38   Reserved
+ * 0X3C   DAR_CURRENT1 RO       32   0
+ * * Write this location once to clear the bit (see
+ * Interrupt/Status register description for which bits
+ * this rule applies to).
+ *
+ ****************************************************************************/
+
+
+/*----------------------------------------------------------------------------------*/
+/* M2P Registers                                                                    */
+/*----------------------------------------------------------------------------------*/
+/*
+ * M2P CONTROL register bit defines
+ */
+#define CONTROL_M2P_STALLINTEN      0x00000001	    /* Enables the STALL interrupt  */
+#define CONTROL_M2P_NFBINTEN        0x00000002	    /* Enables the NFB interrupt    */
+#define CONTROL_M2P_CHERRORINTEN    0x00000008      /* Enables the ChError interrupt*/
+#define CONTROL_M2P_ENABLE		    0x00000010      /* Enables the channel          */
+#define CONTROL_M2P_ABRT		    0x00000020      /* Determines how DMA behaves in*/
+			                                        /* NEXT state with peripheral   */
+                                                    /* error                        */
+			                                        /* 0: NEXT -> ON, ignore error  */
+			                                        /* 1: NEXT -> STALL, disable ch.*/
+#define CONTROL_M2P_ICE			    0x00000040      /* Ignore Channel Error         */
+
+/*
+ * M2P INTERRUPT register bit defines
+ */
+#define INTERRUPT_M2P_STALLINT      0x00000001	    /* Indicates channel stalled.   */
+#define INTERRUPT_M2P_NFBINT        0x00000002		/* Indicates channel is hungry. */
+#define INTERRUPT_M2P_CHERRORINT    0x00000008	    /* Peripheral detects error     */
+
+
+/*
+ * STATUS register bit defines
+ */
+#define STATUS_M2P_STALL            0x00000001		/* A '1' indicates channel is       */
+                                                    /* stalled                          */
+#define STATUS_M2P_NFB			    0x00000002      /* A '1' indicates channel has moved*/
+			                                        /* from NEXT state to ON state, but */
+			                                        /* waiting for next buffer to be    */
+                                                    /* programmed.                      */
+#define STATUS_M2P_CHERROR		    0x00000008      /* Enables the ChError interrupt    */
+#define STATUS_M2P_CURRENT_MASK     0x00000030      /* Current state of the FSM         */
+#define STATUS_M2P_CURRENT_SHIFT    4
+#define STATUS_M2P_NEXTBUFFER	    0x00000040      /* Informs the int handler after an */
+			                                        /* NFB int which pair of maxcnt and */
+                                                    /* base regs to update.             */
+#define STATUS_M2P_BYTES_MASK       0x0000f800 		/* number of valid DMA data         */
+#define STATUS_M2P_BYTES_SHIFT      7               /* currently in                     */
+								        		    /* packer/unpacker                  */
+
+#define STATUS_M2P_DMA_NO_BUF		0x00000000
+#define STATUS_M2P_DMA_BUF_ON		0x00000010
+#define STATUS_M2P_DMA_BUF_NEXT		0x00000020
+
+/*
+ * Register masks to mask off reserved bits after reading register.
+ */
+#define M2P_MASK_PPALLOC            0x0000000f
+#define M2P_MASK_REMAIN             0x0000ffff
+#define M2P_MASK_MAXCNT0            0x0000ffff
+#define M2P_MASK_BASE0              0xffffffff
+#define M2P_MASK_CURRENT0           0xffffffff
+#define M2P_MASK_MAXCNT1            0x0000ffff
+#define M2P_MASK_BASE1              0xffffffff
+#define M2P_MASK_CURRENT1           0xffffffff
+
+
+/*----------------------------------------------------------------------------------*/
+/* M2M Registers                                                                    */
+/*----------------------------------------------------------------------------------*/
+
+#define CONTROL_M2M_STALLINTEN	0x00000001  /* Enables the STALL interrupt                     */
+#define CONTROL_M2M_SCT			0x00000002  /* Source Copy Transfer. Setup a                   */
+										    /* block transfer from 1 memory source             */
+										    /* location.                                       */
+#define CONTROL_M2M_DONEINTEN	0x00000004  /* Enables the DONE interrupt which                */
+										    /* indicates if the xfer completed                 */
+										    /* successfully                                    */
+#define CONTROL_M2M_ENABLE		0x00000008  /* Enables the channel                             */
+#define CONTROL_M2M_START		0x00000010  /* Initiates the xfer. 'software trigger'          */
+#define CONTROL_M2M_BWC_MASK	0x000001e0  /* Bandwidth control. Indicate number of           */
+#define CONTROL_M2M_BWC_SHIFT   5			/* bytes in a transfer.                            */
+#define CONTROL_M2M_PW_MASK		0x00000600  /* Peripheral width. Used for xfers                */
+#define CONTROL_M2M_PW_SHIFT    9			/* between memory and external peripheral.         */
+										    /* 00: byte, 01: halfword, 10: word.               */
+#define CONTROL_M2M_DAH			0x00000800  /* Destination Address Hold                        */
+#define CONTROL_M2M_SAH			0x00001000  /* Source Address Hold                             */
+#define CONTROL_M2M_TM_MASK     0x00006000  /* Transfer Mode. 00: sw triggered,                */
+#define CONTROL_M2M_TM_SHIFT    13			/* 01: hw initiated M2P, 01: hw initiated P2M      */
+#define CONTROL_M2M_ETDP_MASK	0x00018000  /* End-of-Transfer/Terminal Count pin              */
+#define CONTROL_M2M_ETDP_SHIFT  15		    /* direction and polarity.                         */
+#define CONTROL_M2M_DACKP		0x00020000  /* DMA acknowledge pin polarity                    */
+
+#define CONTROL_M2M_DREQP_MASK  0x00180000	/* DMA request pin polarity. must be set           */
+#define CONTROL_M2M_DREQP_SHIFT 19			/* before enable bit.                              */
+#define CONTROL_M2M_NFBINTEN	0x00200000  /* Enables generation of the NFB interrupt.        */
+#define CONTROL_M2M_RSS_MASK    0x00c00000	/* Request source selection:                       */
+#define CONTROL_M2M_RSS_SHIFT	22			/*		000 - External DReq[0]                     */
+										    /*		001 - External DReq[1]                     */
+										    /*		01X - Internal SSPRx                       */
+										    /*		10X - Internal SSPTx                       */
+										    /*		11X - Internal IDE                         */
+#define CONTROL_M2M_NO_HDSK		0x01000000  /* No handshake.  When set the peripheral doesn't  */
+										    /* require the regular handshake protocal. Must    */
+									    	/* be set for SSP and IDE operations, optional     */
+										    /* for external peripherals.                       */
+#define CONTROL_M2M_PWSC_MASK   0xfe000000	/* Peripheral wait states count. Gives the latency */
+#define CONTROL_M2M_PWSC_SHIFT	25			/* (in PCLK cycles) needed by the peripheral to    */
+								    		/* deassert its' request once the M2M xfer w/ DMA  */
+									    	/* is complete.                                    */
+
+/*
+ * M2M INTERRUPT register bit defines
+ */
+#define INTERRUPT_M2M_STALLINT	0x00000001	/* Stall interrupt indicates channel stalled. */
+#define INTERRUPT_M2M_DONEINT	0x00000002	/* Transaction done.                          */
+#define INTERRUPT_M2M_NFBINT	0x00000004	/* Next frame buffer interrupt indicates      */
+											/* channel requires a new buffer              */
+
+
+
+/*
+ * M2M STATUS register bit defines
+ */
+#define STATUS_M2M_STALL		0x00000001  /* A '1' indicates channel is stalled           */
+#define STATUS_M2M_CURRENTSTATE_MASK  0x0000003e  /* Indicates state of M2M Channel control       */
+#define STATUS_M2M_CURRENTSTATE_SHIFT 1		/* FSM (0-2):                                   */
+										    /*	000 - IDLE, 001 - STALL, 010 - MEM_RD,      */
+										    /*  011 - MEM_WR, 100 - BWC_WAIT                */
+										    /* and M2M buffer FSM (3-2):                    */
+										    /* 	00 - NO_BUF, 01 - BUF_ON, 10 - BUF_NEXT     */
+#define STATUS_M2M_DONE		    0x00000040  /* Transfer completed successfully if 1.        */
+#define STATUS_M2M_TCS_MASK		0x00000180  /* Terminal Count status. Indicates whether or  */
+#define STATUS_M2M_TCS_SHIFT    7			/* or not the actual byte count reached         */
+								    		/* programmed limit for buffer descriptor       */
+#define STATUS_M2M_EOTS_MASK    0x00000600  /* End-of-Transfer status for buffer            */
+#define STATUS_M2M_EOTS_SHIFT   9
+#define STATUS_M2M_NFB			0x00000800  /* A '1' indicates channel has moved            */
+										    /* from NEXT state to ON state, but	the next    */
+										    /* byte count reg for next buffer has not been  */
+										    /* programmed yet.                              */
+#define STATUS_M2M_NB			0x00001000  /* NextBuffer status. Informs NFB service       */
+										    /* routine, after NFB int, which pair of buffer */
+										    /* descriptor registers is free to update.      */
+#define STATUS_M2M_DREQS		0x00002000  /* DREQ status.  Reflects the status of the     */
+										    /* synchronized external peripherals DMA        */
+										    /* request signal.                              */
+
+/*
+ * Register masks to mask off reserved bits after reading register.
+ */
+#define M2M_MASK_BCR0             0x0000ffff
+#define M2M_MASK_BCR1             0x0000ffff
+#define M2M_MASK_SAR_BASE0        0xffffffff
+#define M2M_MASK_SAR_BASE1        0xffffffff
+#define M2M_MASK_SAR_CURRENT0     0xffffffff
+#define M2M_MASK_SAR_CURRENT1     0xffffffff
+#define M2M_MASK_DAR_BASE0        0xffffffff
+#define M2M_MASK_DAR_BASE1        0xffffffff
+#define M2M_MASK_DAR_CURRENT0     0xffffffff
+#define M2M_MASK_DAR_CURRENT1     0xffffffff
+
+
+//
+/* 8000_0000 - 8000_ffff: DMA  */
+#define DMA_OFFSET              0x000000
+#define DMA_BASE                (EP93XX_DMA_BASE)
+#define DMAMP_TX_0_CONTROL      (DMA_BASE+0x0000)
+#define DMAMP_TX_0_INTERRUPT    (DMA_BASE+0x0004)
+#define DMAMP_TX_0_PPALLOC      (DMA_BASE+0x0008)
+#define DMAMP_TX_0_STATUS       (DMA_BASE+0x000C)
+#define DMAMP_TX_0_REMAIN       (DMA_BASE+0x0014)
+#define DMAMP_TX_0_MAXCNT0      (DMA_BASE+0x0020)
+#define DMAMP_TX_0_BASE0        (DMA_BASE+0x0024)
+#define DMAMP_TX_0_CURRENT0     (DMA_BASE+0x0028)
+#define DMAMP_TX_0_MAXCNT1      (DMA_BASE+0x0030)
+#define DMAMP_TX_0_BASE1        (DMA_BASE+0x0034)
+#define DMAMP_TX_0_CURRENT1     (DMA_BASE+0x0038)
+
+#define DMAMP_RX_1_CONTROL      (DMA_BASE+0x0040)
+#define DMAMP_RX_1_INTERRUPT    (DMA_BASE+0x0044)
+#define DMAMP_RX_1_PPALLOC      (DMA_BASE+0x0048)
+#define DMAMP_RX_1_STATUS       (DMA_BASE+0x004C)
+#define DMAMP_RX_1_REMAIN       (DMA_BASE+0x0054)
+#define DMAMP_RX_1_MAXCNT0      (DMA_BASE+0x0060)
+#define DMAMP_RX_1_BASE0        (DMA_BASE+0x0064)
+#define DMAMP_RX_1_CURRENT0     (DMA_BASE+0x0068)
+#define DMAMP_RX_1_MAXCNT1      (DMA_BASE+0x0070)
+#define DMAMP_RX_1_BASE1        (DMA_BASE+0x0074)
+#define DMAMP_RX_1_CURRENT1     (DMA_BASE+0x0078)
+
+#define DMAMP_TX_2_CONTROL      (DMA_BASE+0x0080)
+#define DMAMP_TX_2_INTERRUPT    (DMA_BASE+0x0084)
+#define DMAMP_TX_2_PPALLOC      (DMA_BASE+0x0088)
+#define DMAMP_TX_2_STATUS       (DMA_BASE+0x008C)
+#define DMAMP_TX_2_REMAIN       (DMA_BASE+0x0094)
+#define DMAMP_TX_2_MAXCNT0      (DMA_BASE+0x00A0)
+#define DMAMP_TX_2_BASE0        (DMA_BASE+0x00A4)
+#define DMAMP_TX_2_CURRENT0     (DMA_BASE+0x00A8)
+#define DMAMP_TX_2_MAXCNT1      (DMA_BASE+0x00B0)
+#define DMAMP_TX_2_BASE1        (DMA_BASE+0x00B4)
+#define DMAMP_TX_2_CURRENT1     (DMA_BASE+0x00B8)
+
+#define DMAMP_RX_3_CONTROL      (DMA_BASE+0x00C0)
+#define DMAMP_RX_3_INTERRUPT    (DMA_BASE+0x00C4)
+#define DMAMP_RX_3_PPALLOC      (DMA_BASE+0x00C8)
+#define DMAMP_RX_3_STATUS       (DMA_BASE+0x00CC)
+#define DMAMP_RX_3_REMAIN       (DMA_BASE+0x00D4)
+#define DMAMP_RX_3_MAXCNT0      (DMA_BASE+0x00E0)
+#define DMAMP_RX_3_BASE0        (DMA_BASE+0x00E4)
+#define DMAMP_RX_3_CURRENT0     (DMA_BASE+0x00E8)
+#define DMAMP_RX_3_MAXCNT1      (DMA_BASE+0x00F0)
+#define DMAMP_RX_3_BASE1        (DMA_BASE+0x00F4)
+#define DMAMP_RX_3_CURRENT1     (DMA_BASE+0x00F8)
+
+#define DMAMM_0_CONTROL         (DMA_BASE+0x0100)
+#define DMAMM_0_INTERRUPT       (DMA_BASE+0x0104)
+#define DMAMM_0_STATUS          (DMA_BASE+0x010C)
+#define DMAMM_0_BCR0            (DMA_BASE+0x0110)
+#define DMAMM_0_BCR1            (DMA_BASE+0x0114)
+#define DMAMM_0_SAR_BASE0       (DMA_BASE+0x0118)
+#define DMAMM_0_SAR_BASE1       (DMA_BASE+0x011C)
+#define DMAMM_0_SAR_CURRENT0    (DMA_BASE+0x0124)
+#define DMAMM_0_SAR_CURRENT1    (DMA_BASE+0x0128)
+#define DMAMM_0_DAR_BASE0       (DMA_BASE+0x012C)
+#define DMAMM_0_DAR_BASE1       (DMA_BASE+0x0130)
+#define DMAMM_0_DAR_CURRENT0    (DMA_BASE+0x0134)
+#define DMAMM_0_DAR_CURRENT1    (DMA_BASE+0x013C)
+
+#define DMAMM_1_CONTROL         (DMA_BASE+0x0140)
+#define DMAMM_1_INTERRUPT       (DMA_BASE+0x0144)
+#define DMAMM_1_STATUS          (DMA_BASE+0x014C)
+#define DMAMM_1_BCR0            (DMA_BASE+0x0150)
+#define DMAMM_1_BCR1            (DMA_BASE+0x0154)
+#define DMAMM_1_SAR_BASE0       (DMA_BASE+0x0158)
+#define DMAMM_1_SAR_BASE1       (DMA_BASE+0x015C)
+#define DMAMM_1_SAR_CURRENT0    (DMA_BASE+0x0164)
+#define DMAMM_1_SAR_CURRENT1    (DMA_BASE+0x0168)
+#define DMAMM_1_DAR_BASE0       (DMA_BASE+0x016C)
+#define DMAMM_1_DAR_BASE1       (DMA_BASE+0x0170)
+#define DMAMM_1_DAR_CURRENT0    (DMA_BASE+0x0174)
+#define DMAMM_1_DAR_CURRENT1    (DMA_BASE+0x017C)
+
+#define DMAMP_RX_5_CONTROL      (DMA_BASE+0x0200)
+#define DMAMP_RX_5_INTERRUPT    (DMA_BASE+0x0204)
+#define DMAMP_RX_5_PPALLOC      (DMA_BASE+0x0208)
+#define DMAMP_RX_5_STATUS       (DMA_BASE+0x020C)
+#define DMAMP_RX_5_REMAIN       (DMA_BASE+0x0214)
+#define DMAMP_RX_5_MAXCNT0      (DMA_BASE+0x0220)
+#define DMAMP_RX_5_BASE0        (DMA_BASE+0x0224)
+#define DMAMP_RX_5_CURRENT0     (DMA_BASE+0x0228)
+#define DMAMP_RX_5_MAXCNT1      (DMA_BASE+0x0230)
+#define DMAMP_RX_5_BASE1        (DMA_BASE+0x0234)
+#define DMAMP_RX_5_CURRENT1     (DMA_BASE+0x0238)
+
+#define DMAMP_TX_4_CONTROL      (DMA_BASE+0x0240)
+#define DMAMP_TX_4_INTERRUPT    (DMA_BASE+0x0244)
+#define DMAMP_TX_4_PPALLOC      (DMA_BASE+0x0248)
+#define DMAMP_TX_4_STATUS       (DMA_BASE+0x024C)
+#define DMAMP_TX_4_REMAIN       (DMA_BASE+0x0254)
+#define DMAMP_TX_4_MAXCNT0      (DMA_BASE+0x0260)
+#define DMAMP_TX_4_BASE0        (DMA_BASE+0x0264)
+#define DMAMP_TX_4_CURRENT0     (DMA_BASE+0x0268)
+#define DMAMP_TX_4_MAXCNT1      (DMA_BASE+0x0270)
+#define DMAMP_TX_4_BASE1        (DMA_BASE+0x0274)
+#define DMAMP_TX_4_CURRENT1     (DMA_BASE+0x0278)
+
+#define DMAMP_RX_7_CONTROL      (DMA_BASE+0x0280)
+#define DMAMP_RX_7_INTERRUPT    (DMA_BASE+0x0284)
+#define DMAMP_RX_7_PPALLOC      (DMA_BASE+0x0288)
+#define DMAMP_RX_7_STATUS       (DMA_BASE+0x028C)
+#define DMAMP_RX_7_REMAIN       (DMA_BASE+0x0294)
+#define DMAMP_RX_7_MAXCNT0      (DMA_BASE+0x02A0)
+#define DMAMP_RX_7_BASE0        (DMA_BASE+0x02A4)
+#define DMAMP_RX_7_CURRENT0     (DMA_BASE+0x02A8)
+#define DMAMP_RX_7_MAXCNT1      (DMA_BASE+0x02B0)
+#define DMAMP_RX_7_BASE1        (DMA_BASE+0x02B4)
+#define DMAMP_RX_7_CURRENT1     (DMA_BASE+0x02B8)
+
+#define DMAMP_TX_6_CONTROL      (DMA_BASE+0x02C0)
+#define DMAMP_TX_6_INTERRUPT    (DMA_BASE+0x02C4)
+#define DMAMP_TX_6_PPALLOC      (DMA_BASE+0x02C8)
+#define DMAMP_TX_6_STATUS       (DMA_BASE+0x02CC)
+#define DMAMP_TX_6_REMAIN       (DMA_BASE+0x02D4)
+#define DMAMP_TX_6_MAXCNT0      (DMA_BASE+0x02E0)
+#define DMAMP_TX_6_BASE0        (DMA_BASE+0x02E4)
+#define DMAMP_TX_6_CURRENT0     (DMA_BASE+0x02E8)
+#define DMAMP_TX_6_MAXCNT1      (DMA_BASE+0x02F0)
+#define DMAMP_TX_6_BASE1        (DMA_BASE+0x02F4)
+#define DMAMP_TX_6_CURRENT1     (DMA_BASE+0x02F8)
+
+#define DMAMP_RX_9_CONTROL      (DMA_BASE+0x0300)
+#define DMAMP_RX_9_INTERRUPT    (DMA_BASE+0x0304)
+#define DMAMP_RX_9_PPALLOC      (DMA_BASE+0x0308)
+#define DMAMP_RX_9_STATUS       (DMA_BASE+0x030C)
+#define DMAMP_RX_9_REMAIN       (DMA_BASE+0x0314)
+#define DMAMP_RX_9_MAXCNT0      (DMA_BASE+0x0320)
+#define DMAMP_RX_9_BASE0        (DMA_BASE+0x0324)
+#define DMAMP_RX_9_CURRENT0     (DMA_BASE+0x0328)
+#define DMAMP_RX_9_MAXCNT1      (DMA_BASE+0x0330)
+#define DMAMP_RX_9_BASE1        (DMA_BASE+0x0334)
+#define DMAMP_RX_9_CURRENT1     (DMA_BASE+0x0338)
+
+#define DMAMP_TX_8_CONTROL      (DMA_BASE+0x0340)
+#define DMAMP_TX_8_INTERRUPT    (DMA_BASE+0x0344)
+#define DMAMP_TX_8_PPALLOC      (DMA_BASE+0x0348)
+#define DMAMP_TX_8_STATUS       (DMA_BASE+0x034C)
+#define DMAMP_TX_8_REMAIN       (DMA_BASE+0x0354)
+#define DMAMP_TX_8_MAXCNT0      (DMA_BASE+0x0360)
+#define DMAMP_TX_8_BASE0        (DMA_BASE+0x0364)
+#define DMAMP_TX_8_CURRENT0     (DMA_BASE+0x0368)
+#define DMAMP_TX_8_MAXCNT1      (DMA_BASE+0x0370)
+#define DMAMP_TX_8_BASE1        (DMA_BASE+0x0374)
+#define DMAMP_TX_8_CURRENT1     (DMA_BASE+0x0378)
+
+#define DMA_ARBITRATION         (DMA_BASE+0x0380)
+#define DMA_INTERRUPT           (DMA_BASE+0x03C0)
+
+
+/*
+ * DMA Register Base addresses and Offsets
+ */
+#define DMA_M2P_TX_0_BASE       DMAMP_TX_0_CONTROL
+#define DMA_M2P_RX_1_BASE       DMAMP_RX_1_CONTROL
+#define DMA_M2P_TX_2_BASE       DMAMP_TX_2_CONTROL
+#define DMA_M2P_RX_3_BASE       DMAMP_RX_3_CONTROL
+#define DMA_M2M_0_BASE          DMAMM_0_CONTROL
+#define DMA_M2M_1_BASE          DMAMM_1_CONTROL
+#define DMA_M2P_RX_5_BASE       DMAMP_RX_5_CONTROL
+#define DMA_M2P_TX_4_BASE       DMAMP_TX_4_CONTROL
+#define DMA_M2P_RX_7_BASE       DMAMP_RX_7_CONTROL
+#define DMA_M2P_TX_6_BASE       DMAMP_TX_6_CONTROL
+#define DMA_M2P_RX_9_BASE       DMAMP_RX_9_CONTROL
+#define DMA_M2P_TX_8_BASE       DMAMP_TX_8_CONTROL
+
+#define M2P_OFFSET_CONTROL          0x0000
+#define M2P_OFFSET_INTERRUPT        0x0004
+#define M2P_OFFSET_PPALLOC          0x0008
+#define M2P_OFFSET_STATUS           0x000C
+#define M2P_OFFSET_REMAIN           0x0014
+#define M2P_OFFSET_MAXCNT0          0x0020
+#define M2P_OFFSET_BASE0            0x0024
+#define M2P_OFFSET_CURRENT0         0x0028
+#define M2P_OFFSET_MAXCNT1          0x0030
+#define M2P_OFFSET_BASE1            0x0034
+#define M2P_OFFSET_CURRENT1         0x0038
+
+#define M2M_OFFSET_CONTROL          0x0000
+#define M2M_OFFSET_INTERRUPT        0x0004
+#define M2M_OFFSET_STATUS           0x000C
+#define M2M_OFFSET_BCR0             0x0010
+#define M2M_OFFSET_BCR1             0x0014
+#define M2M_OFFSET_SAR_BASE0        0x0018
+#define M2M_OFFSET_SAR_BASE1        0x001C
+#define M2M_OFFSET_SAR_CURRENT0     0x0024
+#define M2M_OFFSET_SAR_CURRENT1     0x0028
+#define M2M_OFFSET_DAR_BASE0        0x002C
+#define M2M_OFFSET_DAR_BASE1        0x0030
+#define M2M_OFFSET_DAR_CURRENT0     0x0034
+#define M2M_OFFSET_DAR_CURRENT1     0x003C
+
+
+
+//-----------------------------------------------------------------------------
+// PWRCNT Register Defines
+//-----------------------------------------------------------------------------
+#define SYSCON_PWRCNT_FIREN             0x80000000
+#define SYSCON_PWRCNT_UARTBAUD          0x20000000
+#define SYSCON_PWRCNT_USHEN             0x10000000
+#define SYSCON_PWRCNT_DMA_M2MCH1        0x08000000
+#define SYSCON_PWRCNT_DMA_M2MCH0        0x04000000
+#define SYSCON_PWRCNT_DMA_M2PCH8        0x02000000
+#define SYSCON_PWRCNT_DMA_M2PCH9        0x01000000
+#define SYSCON_PWRCNT_DMA_M2PCH6        0x00800000
+#define SYSCON_PWRCNT_DMA_M2PCH7        0x00400000
+#define SYSCON_PWRCNT_DMA_M2PCH4        0x00200000
+#define SYSCON_PWRCNT_DMA_M2PCH5        0x00100000
+#define SYSCON_PWRCNT_DMA_M2PCH2        0x00080000
+#define SYSCON_PWRCNT_DMA_M2PCH3        0x00040000
+#define SYSCON_PWRCNT_DMA_M2PCH0        0x00020000
+#define SYSCON_PWRCNT_DMA_M2PCH1        0x00010000
+
+#ifndef __ASSEMBLY__
+/*
+ * DMA Register Base addresses
+ */
+static unsigned int const DMAM2PChannelBase[10] =
+{
+    DMA_M2P_TX_0_BASE,
+    DMA_M2P_RX_1_BASE,
+    DMA_M2P_TX_2_BASE,
+    DMA_M2P_RX_3_BASE,
+    DMA_M2P_TX_4_BASE,
+    DMA_M2P_RX_5_BASE,
+    DMA_M2P_TX_6_BASE,
+    DMA_M2P_RX_7_BASE,
+    DMA_M2P_TX_8_BASE,
+    DMA_M2P_RX_9_BASE
+};
+
+static unsigned int const DMAM2MChannelBase[2] =
+{
+    DMA_M2M_0_BASE,
+    DMA_M2M_1_BASE
+};
+
+#endif /* __ASSEMBLY__ */
+
+/*****************************************************************************
+ *
+ * DMA buffer structure type.
+ *
+ ****************************************************************************/
+typedef struct ep93xx_dma_buffer_s
+{
+    unsigned int    source;     /* buffer physical source address.          */
+    unsigned int    dest;       /* buffer physical destination address,     */
+                                /* only used with the 2 M2M channels.       */
+    unsigned int    size;       /* buffer size in bytes                     */
+    unsigned int    last;       /* 1 if this is the last buffer             */
+                                /* in this transaction.  If 1,              */
+                                /* disable the NFBint so we aren't          */
+                                /* interrupted for another buffer           */
+                                /* when we know there won't be another.     */
+    unsigned int    used;       /* This field is set to 1 by the DMA        */
+                                /* interface after the buffer is transferred*/
+    int    buf_id;              /* unique identifyer specified by the       */
+                                /* the driver which requested the dma       */
+} ep93xx_dma_buffer_t;
+
+typedef ep93xx_dma_buffer_t * ep93xx_dma_buffer_p;
+
+/*****************************************************************************
+ *
+ * Instance definition for the DMA interface.
+ *
+ ****************************************************************************/
+typedef struct ep9312_dma_s
+{
+    /*
+     *  This 1 when the instance is in use, and 0 when it's not.
+     */
+    unsigned int ref_count;
+
+    /*
+     * This is the last valid handle for this instance.  When giving out a
+     * new handle this will be incremented and given out.
+     */
+    int last_valid_handle;
+
+    /*
+     * device specifies one of the 20 DMA hardware ports this
+     * DMA channel will service.
+     */
+    ep93xx_dma_dev_t device;
+
+    /*
+     * DMABufferQueue is the queue of buffer structure pointers which the
+     * dma channel will use to setup transfers.
+     */
+    ep93xx_dma_buffer_t buffer_queue[MAX_EP93XX_DMA_BUFFERS];
+
+    /*
+     * currnt_buffer : This is the buffer currently being transfered on
+     *                 this channel.
+     * last_buffer : This is the last buffer for this transfer.
+     * Note: current_buffer + 1 is already programmed into the dma
+     *       channel as the next buffer to transfer. Don't write
+     *       over either entry.
+     */
+    int current_buffer;
+    int last_buffer;
+
+    /*
+     * The following 3 fields are buffer counters.
+     *
+     * iNewBuffers: Buffers in the queue which have not been transfered.
+     * iUsedBuffers: Buffers in the queue which have have been tranferred,
+     *               and are waiting to be returned.
+     * iTotalBuffers: Total number of buffers in the queue.
+     */
+    int new_buffers;
+    int used_buffers;
+    int total_buffers;
+
+    /*
+     * uiTotalBytes has the total bytes transfered on the channel since the
+     * last flush.  This value does not include the bytes tranfered in the
+     * current buffer.  A byte count is only added after a complete buffer
+     * is tranfered.
+     */
+    unsigned int total_bytes;
+
+    /*
+     *  Interrupt number for this channel
+     */
+    unsigned int irq;
+
+    /*
+     * Indicates whether or not the channel is currently enabled to transfer
+     * data.
+     */
+    unsigned int xfer_enable;
+
+    /*
+     * pause indicates if the dma channel was paused by calling the pause
+     * ioctl.
+     */
+    unsigned int pause;
+
+    /*
+     *  buffer structure used during a pause to capture the current
+     *  address and remaining bytes for the buffer actively being transferred
+     *  on the channel. This buffer will be used to reprogram the dma
+     *  channel upon a resume.
+     */
+    ep93xx_dma_buffer_t pause_buf;
+
+    /*
+     * DMACallback is a function pointer which the calling application can
+     * use install a function to.  this fuction can be used to notify the
+     * calling application of an interrupt.
+     */
+    dma_callback callback;
+
+    /*
+     * User data used as a parameter for the Callback function.  The user
+     * sets up the data and sends it with the callback function.
+     */
+    unsigned int user_data;
+
+    /*
+     * A string representation of the device attached to the channel.
+     */
+    const char * device_id;
+
+    /*
+     * The register base address for this dma channel.
+     */
+    unsigned int reg_base;
+
+    /*
+     * terminated indicates
+     */
+    unsigned int terminated;
+
+
+} ep93xx_dma_t;
+
+/*****************************************************************************
+ *
+ * DMA macros
+ *
+ ****************************************************************************/
+#define DMA_HANDLE_SPECIFIER_MASK   0xF0000000
+#define DMA_CH0_HANDLE_SPECIFIER    0x00000000
+#define DMA_CH1_HANDLE_SPECIFIER    0x10000000
+#define DMA_CH2_HANDLE_SPECIFIER    0x20000000
+#define DMA_CH3_HANDLE_SPECIFIER    0x30000000
+#define DMA_CH4_HANDLE_SPECIFIER    0x40000000
+#define DMA_CH5_HANDLE_SPECIFIER    0x50000000
+#define DMA_CH6_HANDLE_SPECIFIER    0x60000000
+#define DMA_CH7_HANDLE_SPECIFIER    0x70000000
+#define DMA_CH8_HANDLE_SPECIFIER    0x80000000
+#define DMA_CH9_HANDLE_SPECIFIER    0x90000000
+#define DMA_CH10_HANDLE_SPECIFIER   0xA0000000
+#define DMA_CH11_HANDLE_SPECIFIER   0xB0000000
+
+#endif // _DMADRV_H_