* Patch by Peter Ryser, 20 Feb 2004:

  Add support for the Xilinx ML300 platform

* Patch by Stephan Linz, 17 Feb 2004:
  Fix watchdog support for NIOS

* Patch by Josh Fryman, 16 Feb 2004:
  Fix byte-swapping for cfi_flash.c for different bus widths

* Patch by Jon Diekema, 14 Jeb 2004:
  Remove duplicate "FPGA Support" notes from the README file

1 files changed, 738 insertions, 0 deletions

diff --git a/board/xilinx/common/xdma_channel.c b/board/xilinx/common/xdma_channel.c
new file mode 100644
index 0000000..25f1e26
--- /dev/null
+++ b/board/xilinx/common/xdma_channel.c
@@ -0,0 +1,738 @@
+/******************************************************************************
+*
+*     Author: Xilinx, Inc.
+*
+*
+*     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.
+*
+*
+*     XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
+*     COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS
+*     ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD,
+*     XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE
+*     FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING
+*     ANY THIRD PARTY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.
+*     XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO
+*     THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY
+*     WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM
+*     CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND
+*     FITNESS FOR A PARTICULAR PURPOSE.
+*
+*
+*     Xilinx hardware products are not intended for use in life support
+*     appliances, devices, or systems. Use in such applications is
+*     expressly prohibited.
+*
+*
+*     (c) Copyright 2002-2004 Xilinx Inc.
+*     All rights reserved.
+*
+*
+*     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.,
+*     675 Mass Ave, Cambridge, MA 02139, USA.
+*
+* FILENAME:
+*
+* xdma_channel.c
+*
+* DESCRIPTION:
+*
+* This file contains the DMA channel component. This component supports
+* a distributed DMA design in which each device can have it's own dedicated
+* DMA channel, as opposed to a centralized DMA design. This component
+* performs processing for DMA on all devices.
+*
+* See xdma_channel.h for more information about this component.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+
+/***************************** Include Files *********************************/
+
+#include "xdma_channel.h"
+#include "xbasic_types.h"
+#include "xio.h"
+
+/************************** Constant Definitions *****************************/
+
+/**************************** Type Definitions *******************************/
+
+/***************** Macros (Inline Functions) Definitions *********************/
+
+/************************** Function Prototypes ******************************/
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_Initialize
+*
+* DESCRIPTION:
+*
+* This function initializes a DMA channel.  This function must be called
+* prior to using a DMA channel.  Initialization of a channel includes setting
+* up the registers base address, and resetting the channel such that it's in a
+* known state.  Interrupts for the channel are disabled when the channel is
+* reset.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* BaseAddress contains the base address of the registers for the DMA channel.
+*
+* RETURN VALUE:
+*
+* XST_SUCCESS indicating initialization was successful.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+XStatus
+XDmaChannel_Initialize(XDmaChannel * InstancePtr, u32 BaseAddress)
+{
+	/* assert to verify input arguments, don't assert base address */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+
+	/* setup the base address of the registers for the DMA channel such
+	 * that register accesses can be done
+	 */
+	InstancePtr->RegBaseAddress = BaseAddress;
+
+	/* initialize the scatter gather list such that it indicates it has not
+	 * been created yet and the DMA channel is ready to use (initialized)
+	 */
+	InstancePtr->GetPtr = NULL;
+	InstancePtr->PutPtr = NULL;
+	InstancePtr->CommitPtr = NULL;
+	InstancePtr->LastPtr = NULL;
+
+	InstancePtr->TotalDescriptorCount = 0;
+	InstancePtr->ActiveDescriptorCount = 0;
+	InstancePtr->IsReady = XCOMPONENT_IS_READY;
+
+	/* initialize the version of the component
+	 */
+	XVersion_FromString(&InstancePtr->Version, "1.00a");
+
+	/* reset the DMA channel such that it's in a known state and ready
+	 * and indicate the initialization occured with no errors, note that
+	 * the is ready variable must be set before this call or reset will assert
+	 */
+	XDmaChannel_Reset(InstancePtr);
+
+	return XST_SUCCESS;
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_IsReady
+*
+* DESCRIPTION:
+*
+* This function determines if a DMA channel component has been successfully
+* initialized such that it's ready to use.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* TRUE if the DMA channel component is ready, FALSE otherwise.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+u32
+XDmaChannel_IsReady(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments used by the base component */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+
+	return InstancePtr->IsReady == XCOMPONENT_IS_READY;
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_GetVersion
+*
+* DESCRIPTION:
+*
+* This function gets the software version for the specified DMA channel
+* component.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* A pointer to the software version of the specified DMA channel.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+XVersion *
+XDmaChannel_GetVersion(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* return a pointer to the version of the DMA channel */
+
+	return &InstancePtr->Version;
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_SelfTest
+*
+* DESCRIPTION:
+*
+* This function performs a self test on the specified DMA channel.  This self
+* test is destructive as the DMA channel is reset and a register default is
+* verified.
+*
+* ARGUMENTS:
+*
+* InstancePtr is a pointer to the DMA channel to be operated on.
+*
+* RETURN VALUE:
+*
+* XST_SUCCESS is returned if the self test is successful, or one of the
+* following errors.
+*
+*	XST_DMA_RESET_REGISTER_ERROR 		Indicates the control register value
+*										after a reset was not correct
+*
+* NOTES:
+*
+* This test does not performs a DMA transfer to test the channel because the
+* DMA hardware will not currently allow a non-local memory transfer to non-local
+* memory (memory copy), but only allows a non-local memory to or from the device
+* memory (typically a FIFO).
+*
+******************************************************************************/
+
+#define XDC_CONTROL_REG_RESET_MASK  0x98000000UL	/* control reg reset value */
+
+XStatus
+XDmaChannel_SelfTest(XDmaChannel * InstancePtr)
+{
+	u32 ControlReg;
+
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* reset the DMA channel such that it's in a known state before the test
+	 * it resets to no interrupts enabled, the desired state for the test
+	 */
+	XDmaChannel_Reset(InstancePtr);
+
+	/* this should be the first test to help prevent a lock up with the polling
+	 * loop that occurs later in the test, check the reset value of the DMA
+	 * control register to make sure it's correct, return with an error if not
+	 */
+	ControlReg = XDmaChannel_GetControl(InstancePtr);
+	if (ControlReg != XDC_CONTROL_REG_RESET_MASK) {
+		return XST_DMA_RESET_REGISTER_ERROR;
+	}
+
+	return XST_SUCCESS;
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_Reset
+*
+* DESCRIPTION:
+*
+* This function resets the DMA channel. This is a destructive operation such
+* that it should not be done while a channel is being used.  If the DMA channel
+* is transferring data into other blocks, such as a FIFO, it may be necessary
+* to reset other blocks.  This function does not modify the contents of a
+* scatter gather list for a DMA channel such that the user is responsible for
+* getting buffer descriptors from the list if necessary.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* None.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+void
+XDmaChannel_Reset(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_VOID(InstancePtr != NULL);
+	XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* reset the DMA channel such that it's in a known state, the reset
+	 * register is self clearing such that it only has to be set
+	 */
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_RST_REG_OFFSET,
+		  XDC_RESET_MASK);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_GetControl
+*
+* DESCRIPTION:
+*
+* This function gets the control register contents of the DMA channel.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* The control register contents of the DMA channel. One or more of the
+* following values may be contained the register.  Each of the values are
+* unique bit masks.
+*
+*	XDC_DMACR_SOURCE_INCR_MASK	Increment the source address
+*	XDC_DMACR_DEST_INCR_MASK	Increment the destination address
+*	XDC_DMACR_SOURCE_LOCAL_MASK Local source address
+*	XDC_DMACR_DEST_LOCAL_MASK	Local destination address
+*	XDC_DMACR_SG_ENABLE_MASK	Scatter gather enable
+*	XDC_DMACR_GEN_BD_INTR_MASK	Individual buffer descriptor interrupt
+*	XDC_DMACR_LAST_BD_MASK		Last buffer descriptor in a packet
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+u32
+XDmaChannel_GetControl(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* return the contents of the DMA control register */
+
+	return XIo_In32(InstancePtr->RegBaseAddress + XDC_DMAC_REG_OFFSET);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_SetControl
+*
+* DESCRIPTION:
+*
+* This function sets the control register of the specified DMA channel.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* Control contains the value to be written to the control register of the DMA
+* channel. One or more of the following values may be contained the register.
+* Each of the values are unique bit masks such that they may be ORed together
+* to enable multiple bits or inverted and ANDed to disable multiple bits.
+*
+*	XDC_DMACR_SOURCE_INCR_MASK	Increment the source address
+*	XDC_DMACR_DEST_INCR_MASK	Increment the destination address
+*	XDC_DMACR_SOURCE_LOCAL_MASK Local source address
+*	XDC_DMACR_DEST_LOCAL_MASK	Local destination address
+*	XDC_DMACR_SG_ENABLE_MASK	Scatter gather enable
+*	XDC_DMACR_GEN_BD_INTR_MASK	Individual buffer descriptor interrupt
+*	XDC_DMACR_LAST_BD_MASK		Last buffer descriptor in a packet
+*
+* RETURN VALUE:
+*
+* None.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+void
+XDmaChannel_SetControl(XDmaChannel * InstancePtr, u32 Control)
+{
+	/* assert to verify input arguments except the control which can't be
+	 * asserted since all values are valid
+	 */
+	XASSERT_VOID(InstancePtr != NULL);
+	XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* set the DMA control register to the specified value */
+
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_DMAC_REG_OFFSET, Control);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_GetStatus
+*
+* DESCRIPTION:
+*
+* This function gets the status register contents of the DMA channel.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* The status register contents of the DMA channel. One or more of the
+* following values may be contained the register. Each of the values are
+* unique bit masks.
+*
+*	XDC_DMASR_BUSY_MASK			The DMA channel is busy
+*	XDC_DMASR_BUS_ERROR_MASK	A bus error occurred
+*	XDC_DMASR_BUS_TIMEOUT_MASK	A bus timeout occurred
+*	XDC_DMASR_LAST_BD_MASK		The last buffer descriptor of a packet
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+u32
+XDmaChannel_GetStatus(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* return the contents of the DMA status register */
+
+	return XIo_In32(InstancePtr->RegBaseAddress + XDC_DMAS_REG_OFFSET);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_SetIntrStatus
+*
+* DESCRIPTION:
+*
+* This function sets the interrupt status register of the specified DMA channel.
+* Setting any bit of the interrupt status register will clear the bit to
+* indicate the interrupt processing has been completed. The definitions of each
+* bit in the register match the definition of the bits in the interrupt enable
+* register.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* Status contains the value to be written to the status register of the DMA
+* channel.  One or more of the following values may be contained the register.
+* Each of the values are unique bit masks such that they may be ORed together
+* to enable multiple bits or inverted and ANDed to disable multiple bits.
+*
+*	XDC_IXR_DMA_DONE_MASK		The dma operation is done
+*	XDC_IXR_DMA_ERROR_MASK	    The dma operation had an error
+*	XDC_IXR_PKT_DONE_MASK	    A packet is complete
+*	XDC_IXR_PKT_THRESHOLD_MASK 	The packet count threshold reached
+*	XDC_IXR_PKT_WAIT_BOUND_MASK The packet wait bound reached
+*	XDC_IXR_SG_DISABLE_ACK_MASK The scatter gather disable completed
+*	XDC_IXR_BD_MASK				A buffer descriptor is done
+*
+* RETURN VALUE:
+*
+* None.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+void
+XDmaChannel_SetIntrStatus(XDmaChannel * InstancePtr, u32 Status)
+{
+	/* assert to verify input arguments except the status which can't be
+	 * asserted since all values are valid
+	 */
+	XASSERT_VOID(InstancePtr != NULL);
+	XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* set the interrupt status register with the specified value such that
+	 * all bits which are set in the register are cleared effectively clearing
+	 * any active interrupts
+	 */
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_IS_REG_OFFSET, Status);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_GetIntrStatus
+*
+* DESCRIPTION:
+*
+* This function gets the interrupt status register of the specified DMA channel.
+* The interrupt status register indicates which interrupts are active
+* for the DMA channel.  If an interrupt is active, the status register must be
+* set (written) with the bit set for each interrupt which has been processed
+* in order to clear the interrupts.  The definitions of each bit in the register
+* match the definition of the bits in the interrupt enable register.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* The interrupt status register contents of the specified DMA channel.
+* One or more of the following values may be contained the register.
+* Each of the values are unique bit masks.
+*
+*	XDC_IXR_DMA_DONE_MASK		The dma operation is done
+*	XDC_IXR_DMA_ERROR_MASK	    The dma operation had an error
+*	XDC_IXR_PKT_DONE_MASK	    A packet is complete
+*	XDC_IXR_PKT_THRESHOLD_MASK 	The packet count threshold reached
+*	XDC_IXR_PKT_WAIT_BOUND_MASK The packet wait bound reached
+*	XDC_IXR_SG_DISABLE_ACK_MASK The scatter gather disable completed
+*	XDC_IXR_SG_END_MASK			Current descriptor was the end of the list
+*	XDC_IXR_BD_MASK				A buffer descriptor is done
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+u32
+XDmaChannel_GetIntrStatus(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* return the contents of the interrupt status register */
+
+	return XIo_In32(InstancePtr->RegBaseAddress + XDC_IS_REG_OFFSET);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_SetIntrEnable
+*
+* DESCRIPTION:
+*
+* This function sets the interrupt enable register of the specified DMA
+* channel.  The interrupt enable register contains bits which enable
+* individual interrupts for the DMA channel.  The definitions of each bit
+* in the register match the definition of the bits in the interrupt status
+* register.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* Enable contains the interrupt enable register contents to be written
+* in the DMA channel. One or more of the following values may be contained
+* the register. Each of the values are unique bit masks such that they may be
+* ORed together to enable multiple bits or inverted and ANDed to disable
+* multiple bits.
+*
+*	XDC_IXR_DMA_DONE_MASK		The dma operation is done
+*	XDC_IXR_DMA_ERROR_MASK	    The dma operation had an error
+*	XDC_IXR_PKT_DONE_MASK	    A packet is complete
+*	XDC_IXR_PKT_THRESHOLD_MASK 	The packet count threshold reached
+*	XDC_IXR_PKT_WAIT_BOUND_MASK The packet wait bound reached
+*	XDC_IXR_SG_DISABLE_ACK_MASK The scatter gather disable completed
+*	XDC_IXR_SG_END_MASK			Current descriptor was the end of the list
+*	XDC_IXR_BD_MASK				A buffer descriptor is done
+*
+* RETURN VALUE:
+*
+* None.
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+void
+XDmaChannel_SetIntrEnable(XDmaChannel * InstancePtr, u32 Enable)
+{
+	/* assert to verify input arguments except the enable which can't be
+	 * asserted since all values are valid
+	 */
+	XASSERT_VOID(InstancePtr != NULL);
+	XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* set the interrupt enable register to the specified value */
+
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_IE_REG_OFFSET, Enable);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_GetIntrEnable
+*
+* DESCRIPTION:
+*
+* This function gets the interrupt enable of the DMA channel.  The
+* interrupt enable contains flags which enable individual interrupts for the
+* DMA channel. The definitions of each bit in the register match the definition
+* of the bits in the interrupt status register.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* RETURN VALUE:
+*
+* The interrupt enable of the DMA channel.  One or more of the following values
+* may be contained the register. Each of the values are unique bit masks.
+*
+*	XDC_IXR_DMA_DONE_MASK		The dma operation is done
+*	XDC_IXR_DMA_ERROR_MASK	    The dma operation had an error
+*	XDC_IXR_PKT_DONE_MASK	    A packet is complete
+*	XDC_IXR_PKT_THRESHOLD_MASK 	The packet count threshold reached
+*	XDC_IXR_PKT_WAIT_BOUND_MASK The packet wait bound reached
+*	XDC_IXR_SG_DISABLE_ACK_MASK The scatter gather disable completed
+*	XDC_IXR_BD_MASK				A buffer descriptor is done
+*
+* NOTES:
+*
+* None.
+*
+******************************************************************************/
+u32
+XDmaChannel_GetIntrEnable(XDmaChannel * InstancePtr)
+{
+	/* assert to verify input arguments */
+
+	XASSERT_NONVOID(InstancePtr != NULL);
+	XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* return the contents of the interrupt enable register */
+
+	return XIo_In32(InstancePtr->RegBaseAddress + XDC_IE_REG_OFFSET);
+}
+
+/******************************************************************************
+*
+* FUNCTION:
+*
+* XDmaChannel_Transfer
+*
+* DESCRIPTION:
+*
+* This function starts the DMA channel transferring data from a memory source
+* to a memory destination. This function only starts the operation and returns
+* before the operation may be complete.  If the interrupt is enabled, an
+* interrupt will be generated when the operation is complete, otherwise it is
+* necessary to poll the channel status to determine when it's complete.  It is
+* the responsibility of the caller to determine when the operation is complete
+* by handling the generated interrupt or polling the status.  It is also the
+* responsibility of the caller to ensure that the DMA channel is not busy with
+* another transfer before calling this function.
+*
+* ARGUMENTS:
+*
+* InstancePtr contains a pointer to the DMA channel to operate on.
+*
+* SourcePtr contains a pointer to the source memory where the data is to
+* be tranferred from and must be 32 bit aligned.
+*
+* DestinationPtr contains a pointer to the destination memory where the data
+* is to be transferred and must be 32 bit aligned.
+*
+* ByteCount contains the number of bytes to transfer during the DMA operation.
+*
+* RETURN VALUE:
+*
+* None.
+*
+* NOTES:
+*
+* The DMA h/w will not currently allow a non-local memory transfer to non-local
+* memory (memory copy), but only allows a non-local memory to or from the device
+* memory (typically a FIFO).
+*
+* It is the responsibility of the caller to ensure that the cache is
+* flushed and invalidated both before and after the DMA operation completes
+* if the memory pointed to is cached. The caller must also ensure that the
+* pointers contain a physical address rather than a virtual address
+* if address translation is being used.
+*
+******************************************************************************/
+void
+XDmaChannel_Transfer(XDmaChannel * InstancePtr,
+		     u32 * SourcePtr, u32 * DestinationPtr, u32 ByteCount)
+{
+	/* assert to verify input arguments and the alignment of any arguments
+	 * which have expected alignments
+	 */
+	XASSERT_VOID(InstancePtr != NULL);
+	XASSERT_VOID(SourcePtr != NULL);
+	XASSERT_VOID(((u32) SourcePtr & 3) == 0);
+	XASSERT_VOID(DestinationPtr != NULL);
+	XASSERT_VOID(((u32) DestinationPtr & 3) == 0);
+	XASSERT_VOID(ByteCount != 0);
+	XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);
+
+	/* setup the source and destination address registers for the transfer */
+
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_SA_REG_OFFSET,
+		  (u32) SourcePtr);
+
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_DA_REG_OFFSET,
+		  (u32) DestinationPtr);
+
+	/* start the DMA transfer to copy from the source buffer to the
+	 * destination buffer by writing the length to the length register
+	 */
+	XIo_Out32(InstancePtr->RegBaseAddress + XDC_LEN_REG_OFFSET, ByteCount);
+}