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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>mca_set_dma_mode</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s07.html#id2685468" title="MCA Bus DMA" /><link rel="prev" href="re442.html" title="mca_set_dma_io" /><link rel="next" href="ch10.html" title="Chapter&#160;10.&#160;Firmware Interfaces" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>mca_set_dma_mode</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re442.html">Prev</a>&#160;</td><th width="60%" align="center">MCA Bus DMA</th><td width="20%" align="right">&#160;<a accesskey="n" href="ch10.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="mca_set_dma_mode"><a id="API-mca-set-dma-mode"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mca_set_dma_mode &#8212; 
     set the DMA mode
 </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">mca_set_dma_mode </b>(</code></td><td>unsigned int <var class="pdparam">dmanr</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">mode</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1" title="Arguments"><a id="id2686455"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dmanr</code></em></span></dt><dd><p>
     DMA channel
    </p></dd><dt><span class="term"><em class="parameter"><code>mode</code></em></span></dt><dd><p>
     mode to set
    </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2686498"></a><h2>Description</h2><p>
   The DMA controller supports several modes. The mode values you can
   set are-
   </p><p>

   <code class="constant">MCA_DMA_MODE_READ</code> when reading from the DMA device.
   </p><p>

   <code class="constant">MCA_DMA_MODE_WRITE</code> to writing to the DMA device.
   </p><p>

   <code class="constant">MCA_DMA_MODE_IO</code> to do DMA to or from an I/O port.
   </p><p>

   <code class="constant">MCA_DMA_MODE_16</code> to do 16bit transfers.
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