b2000e56f9
Replace archaic "busses" with modern form "buses." Intentionally excluded: * Old/random drivers I didn't recognize * Old hardware in general * Use of "busses" in code as identifiers No functional change. http://grammarist.com/spelling/buses-busses/ PR: 216099 Reported by: bltsrc at mail.ru Sponsored by: Dell EMC Isilon
102 lines
3.1 KiB
Groff
102 lines
3.1 KiB
Groff
.\" $NetBSD: ehci.4,v 1.8 2001/11/21 17:22:56 augustss Exp $
|
|
.\"
|
|
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Lennart Augustsson.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 15, 2017
|
|
.Dt EHCI 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ehci
|
|
.Nd USB Enhanced Host Controller driver
|
|
.Sh SYNOPSIS
|
|
.Cd "device ehci"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides support for the
|
|
.Tn USB
|
|
Enhanced Host Controller Interface,
|
|
which is used by
|
|
.Tn USB
|
|
2.0 controllers.
|
|
.Pp
|
|
.Tn EHCI
|
|
controllers are peculiar in that they can only handle the
|
|
.Tn USB
|
|
2.0 protocol.
|
|
This means that they normally have one or more companion controllers
|
|
(i.e.,
|
|
.Xr ohci 4
|
|
or
|
|
.Xr uhci 4 )
|
|
handling USB 1.x devices.
|
|
Consequently each
|
|
.Tn USB
|
|
connector is electrically connected to two
|
|
.Tn USB
|
|
controllers.
|
|
The handling of this is totally automatic,
|
|
but can be noticed since
|
|
.Tn USB
|
|
1.x and
|
|
.Tn USB
|
|
2.0 devices plugged in to the same
|
|
connector appear to connect to different USB buses.
|
|
.Sh SEE ALSO
|
|
.Xr ohci 4 ,
|
|
.Xr uhci 4 ,
|
|
.Xr usb 4 ,
|
|
.Xr xhci 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
device driver first appeared in
|
|
.Fx 5.1 .
|
|
.Sh LOADER TUNABLES
|
|
When the kernel has been compiled with
|
|
.Cd options USB_DEBUG ,
|
|
some tunables become available that affect the behavior of
|
|
.Nm .
|
|
These tunables can be set at the
|
|
.Xr loader 8
|
|
prompt before booting the kernel or stored in
|
|
.Xr loader.conf 5 .
|
|
.Bl -tag -width "xxxxxx"
|
|
.It Va hw.usb.ehci.lostintrbug
|
|
This tunable enables the lost interrupt quirk.
|
|
The default value is 0 (off).
|
|
.It Va hw.usb.ehci.iaadbug
|
|
This tunable enables the EHCI doorbell quirk.
|
|
The default value is 0 (off).
|
|
.It Va hw.usb.ehci.no_hs
|
|
This tunable disables USB devices to attach like HIGH-speed ones and will force all attached devices to attach to the FULL- or LOW-speed companion controller.
|
|
The default value is 0 (off).
|
|
.El
|