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Adaptation/GUID-EE50283A-543C-446F-A5D1-E64043F988ED.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-EE50283A-543C-446F-A5D1-E64043F988ED" xml:lang="en"><title>DMA Device Driver Guide</title><shortdesc>Explains the key concepts that the device driver creator
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needs to know before developing a device driver.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The DMA framework bypasses the CPU for data transfers. Without
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DMA, the CPU would have to copy each piece of data from the source
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to the destination.<ul>
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<li><p><b>Device Driver:</b> A set of methods that tells the platform
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how to use a specific piece of hardware.</p></li>
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</ul><ul>
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<li><p><b>DMA Framework:</b> The DMA framework provides a simplified
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and unified access to DMA resources in a device. Generic transfer
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parameters abstract the underlying DMA hardware for basic services,
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and fine-grained control is still available for platform-specific
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features. </p></li>
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</ul><ul>
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<li><p><b>DMA Operation:</b> Before any DMA transfers can be undertaken,
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the DMA channel to be used and the source and destination addresses
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of the data to be transferred have to be specified. The transfer details
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are placed onto a queue for the DMA channel specified. The item at
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the head of the queue will be the active transfer and the rest of
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the queue will be pending transfers. </p></li>
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</ul></p>
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</conbody><related-links>
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<link href="GUID-AB5370D9-9F0B-4583-A825-11CBF7C6365C.dita"><linktext>DMA
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Tutorials Overview</linktext></link>
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<link href="GUID-EDC1C30B-4078-4434-95AC-2E37AF809A51.dita"><linktext>DMA
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Implementation Overview</linktext></link>
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<link href="GUID-4E3C086B-25BE-4DAC-9E21-CFC4F8B792A5.dita"><linktext>DMA
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Technology Guide</linktext></link>
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</related-links></concept>
MCL/sftools/depl/docscontent