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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>pci_iomap</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Bus-Independent Device Accesses" /><link rel="up" href="ch05.html" title="Chapter 5. Public Functions Provided" /><link rel="prev" href="re01.html" title="/builddir/build/BUILD/kernel-2.6.32-71.14.1.el6/linux-2.6.32-71.14.1.el6.noarch//arch/x86/include/asm/io_32.h" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>pci_iomap</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re01.html">Prev</a> </td><th width="60%" align="center">Chapter 5. Public Functions Provided</th><td width="20%" align="right"> </td></tr></table><hr /></div><div class="refentry" title="pci_iomap"><a id="API-pci-iomap"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_iomap —
create a virtual mapping cookie for a PCI BAR
</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 __iomem * <b class="fsfunc">pci_iomap </b>(</code></td><td>struct pci_dev * <var class="pdparam">dev</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">bar</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">maxlen</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2753572"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
PCI device that owns the BAR
</p></dd><dt><span class="term"><em class="parameter"><code>bar</code></em></span></dt><dd><p>
BAR number
</p></dd><dt><span class="term"><em class="parameter"><code>maxlen</code></em></span></dt><dd><p>
length of the memory to map
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2753631"></a><h2>Description</h2><p>
Using this function you will get a __iomem address to your device BAR.
You can access it using ioread*() and iowrite*(). These functions hide
the details if this is a MMIO or PIO address space and will just do what
you expect from them in the correct way.
</p><p>
<em class="parameter"><code>maxlen</code></em> specifies the maximum length to map. If you want to get access to
the complete BAR without checking for its length first, pass <code class="constant">0</code> here.
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