<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>ata_wait_register</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="libATA Developer's Guide" /><link rel="up" href="ch04.html" title="Chapter 4. libata Library" /><link rel="prev" href="re58.html" title="ata_pci_remove_one" /><link rel="next" href="ch05.html" title="Chapter 5. libata Core Internals" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ata_wait_register</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re58.html">Prev</a> </td><th width="60%" align="center">Chapter 4. libata Library</th><td width="20%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ata_wait_register"><a id="API-ata-wait-register"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_wait_register — wait until register value changes </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">u32 <b class="fsfunc">ata_wait_register </b>(</code></td><td>void __iomem * <var class="pdparam">reg</var>, </td></tr><tr><td> </td><td>u32 <var class="pdparam">mask</var>, </td></tr><tr><td> </td><td>u32 <var class="pdparam">val</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">interval</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">timeout</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2901165"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>reg</code></em></span></dt><dd><p> IO-mapped register </p></dd><dt><span class="term"><em class="parameter"><code>mask</code></em></span></dt><dd><p> Mask to apply to read register value </p></dd><dt><span class="term"><em class="parameter"><code>val</code></em></span></dt><dd><p> Wait condition </p></dd><dt><span class="term"><em class="parameter"><code>interval</code></em></span></dt><dd><p> polling interval in milliseconds </p></dd><dt><span class="term"><em class="parameter"><code>timeout</code></em></span></dt><dd><p> timeout in milliseconds </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2901257"></a><h2>Description</h2><p> Waiting for some bits of register to change is a common operation for ATA controllers. This function reads 32bit LE IO-mapped register <em class="parameter"><code>reg</code></em> and tests for the following condition. </p><p> (*<em class="parameter"><code>reg</code></em> & mask) != val </p><p> If the condition is met, it returns; otherwise, the process is repeated after <em class="parameter"><code>interval_msec</code></em> until timeout. </p></div><div class="refsect1" title="LOCKING"><a id="id2901293"></a><h2>LOCKING</h2><p> Kernel thread context (may sleep) </p></div><div class="refsect1" title="RETURNS"><a id="id2901303"></a><h2>RETURNS</h2><p> The final register value. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re58.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>ata_pci_remove_one</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 5. libata Core Internals</td></tr></table></div></body></html>