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<table class="head">
<tr>
<td class="head-ltitle">XHCI(4)</td>
<td class="head-vol">Device Drivers Manual</td>
<td class="head-rtitle">XHCI(4)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">xhci</code> — <span class="Nd">USB
eXtensible Host Controller driver</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp"><code class="Cd">options USB_DEBUG</code>
<br/>
<code class="Cd">device xhci</code></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The <code class="Nm">xhci</code> driver provides support for the
USB eXtensible Host Controller Interface, which allows use of USB 1.0, 2.0
and 3.0 devices on the same USB port.</p>
<p class="Pp">The XHCI controller supports USB connection speeds from 5.0Gbps
and above when using USB 3.x compliant devices.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
<p class="Pp">The <code class="Nm">xhci</code> driver supports XHCI compatible
controllers having PCI class 12 (serial bus), subclass 3 (USB) and
programming interface 48 (XHCI).</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
VARIABLES</a></h1>
<p class="Pp">The following variables are available as both
<a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
tunables:</p>
<dl class="Bl-tag">
<dt id="hw.usb.xhci.debug"><var class="Va">hw.usb.xhci.debug</var></dt>
<dd>Set debug output level, where 0 is debugging disabled and larger values
increase debug message verbosity. The default value is 0.</dd>
<dt id="hw.usb.xhci.dcepquirk"><var class="Va">hw.usb.xhci.dcepquirk</var></dt>
<dd>Set to enable quirk for deconfiguration of endpoints. The default value is
0.</dd>
<dt id="hw.usb.xhci.ctlquirk"><var class="Va">hw.usb.xhci.ctlquirk</var></dt>
<dd>Set to submit full USB control request as one job, up to 64kBytes. Else
the USB control request will be split into multiple smaller requests. The
default value is 1.</dd>
<dt id="hw.usb.xhci.streams"><var class="Va">hw.usb.xhci.streams</var></dt>
<dd>Set to enable USB streams support. The default value is 0.</dd>
<dt id="hw.usb.xhci.route"><var class="Va">hw.usb.xhci.route</var></dt>
<dd>Set bitmap for switching EHCI ports to the XHCI controller. The default
value is 0.</dd>
<dt id="hw.usb.xhci.polling"><var class="Va">hw.usb.xhci.polling</var></dt>
<dd>Set to use a timer to poll the interrupt handler. The default value is
0.</dd>
<dt id="hw.usb.xhci.dma32"><var class="Va">hw.usb.xhci.dma32</var></dt>
<dd>Set to only use 32-bit DMA for the XHCI controller. The default value is
0.</dd>
<dt id="hw.usb.xhci.ctlstep"><var class="Va">hw.usb.xhci.ctlstep</var></dt>
<dd>Set to enable control endpoint status state stepping. The default value is
0.</dd>
</dl>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<p class="Pp"><a class="Xr">ehci(4)</a>, <a class="Xr">ohci(4)</a>,
<a class="Xr">uhci(4)</a> and <a class="Xr">usb(4)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp">The <code class="Nm">xhci</code> device driver first appeared in
<span class="Ux">FreeBSD 8.2</span>.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">October 21, 2022</td>
<td class="foot-os">FreeBSD 15.0</td>
</tr>
</table>
|
