56 lines
2.1 KiB
Groff
56 lines
2.1 KiB
Groff
.\" $NetBSD: attimer.4,v 1.4 2009/03/09 19:24:28 joerg Exp $
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.\"
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.\" Copyright (c) 2005 The NetBSD Foundation.
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.\" 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 22, 2005
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.Dt ATTIMER 4
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.Os
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.Sh NAME
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.Nm attimer
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.Nd AT Timer (8253) driver
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.Sh SYNOPSIS
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.Cd "attimer* at acpi?"
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.Cd "attimer0 at isa?"
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.Sh DESCRIPTION
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The
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.Nm
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driver handles the so-called AT Timer device, initially found as chip
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model 8253.
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It is used as the main counter for the clock on the i386 port,
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but also offers control over the pitch of the PC speaker.
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.Pp
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The
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.Nm
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driver currently only implements the access to the ISA register
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.Dq TIMER1
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which controls the pitch of the PC speaker,
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and should be configured along with
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.Xr pcppi 4
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to be of any actual use.
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.Sh SEE ALSO
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.Xr acpi 4 ,
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.Xr isa 4 ,
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.Xr pcppi 4
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