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80 lines
2.3 KiB
Groff
80 lines
2.3 KiB
Groff
.\"
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.\" Copyright (c) 2011 Hans Petter Selasky. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 24, 2018
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.Dt XHCI 4
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.Os
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.Sh NAME
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.Nm xhci
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.Nd USB eXtensible Host Controller driver
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.Sh SYNOPSIS
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.Cd "device xhci"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the
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.Tn USB
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eXtensible Host Controller Interface,
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which allows use of
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.Tn USB
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1.0, 2.0 and 3.0 devices on the same
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.Tn USB
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port.
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.Pp
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The
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.Tn XHCI
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controller supports
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.Tn USB
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connection speeds up to 5.0Gbps when using a USB 3.0 compliant device.
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.Sh HARDWARE
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The
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.Nm
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driver supports
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.Tn XHCI
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compatible controllers having PCI class 12 (serial bus),
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subclass 3 (USB) and programming interface 48 (XHCI).
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.Sh SYSCTL VARIABLES
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The following variables are available as both
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.Xr sysctl 8
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variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width indent
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.It Va hw.usb.xhci.debug
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Debug output level, where 0 is debugging disabled and larger values increase
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debug message verbosity.
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Default is 0.
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.Sh SEE ALSO
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.Xr ehci 4 ,
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.Xr ohci 4 ,
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.Xr uhci 4 ,
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.Xr usb 4
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 8.2 .
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