1.\" $NetBSD: ichlpcib.4,v 1.3 2011/01/20 08:53:24 jruoho Exp $ 2.\" 3.\" Copyright (c) 2004 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Minoura Makoto and Matthew R. Green. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd January 20, 2011 31.Dt ICHLPCIB 4 x86 32.Os 33.Sh NAME 34.Nm ichlpcib 35.Nd Intel ICH LPC Interface Bridge 36.Sh SYNOPSIS 37.Cd "ichlpcib* at pci? dev ? function ?" 38.Cd "fwhrng* at ichlpcib?" 39.Cd "hpet0 at ichlpcib?" 40.Cd "isa0 at ichlpcib?" 41.Cd "gpio* at ichlpcib?" 42.Sh DESCRIPTION 43The 44.Nm 45driver supports the Intel ICH LPC Interface Bridges on compatible 46chipsets. 47Supported functions include: 48.Bl -bullet 49.It 50Watchdog timer. 51The watchdog timer may be configured for a 2 seconds (on ICH6 or newer) 52and 4 seconds (on ICH5 or older) min period and for a 39 seconds 53(on ICH5 or older) or 613 seconds max period (on ICH6 or newer). 54.It 55Power Management timer. 56A 24-bit timer available to be used by the timecounters framework. 57.It 58SpeedStep. 59In some older systems the SpeedStep function is also available, and can be 60used to switch between high and low frequency (to reduce power consumption) 61via the 62.Li machdep.speedstep_state 63.Xr sysctl 8 64node. 65A value of 0 will use the low frequency (low power) and a 1 will 66enable the high frequency (full power). 67.It 68General Purpose Input/Output. 69The ICH provides up to 64 I/O pins which can be accessed through the 70.Xr gpio 4 71framework. 72.El 73.Sh SEE ALSO 74.Xr fwhrng 4 , 75.Xr gpio 4 , 76.Xr hpet 4 , 77.Xr ioapic 4 , 78.Xr sysctl 8 , 79.Xr wdogctl 8 80.Sh HISTORY 81The 82.Nm 83driver first appeared in 84.Nx 3.0 . 85.Sh AUTHORS 86The 87.Nm 88driver was written by 89.An Minoura Makoto 90and 91.An Matthew R. Green . 92