1.\" $NetBSD: geodecntr.4,v 1.3 2009/05/27 19:24:00 snj Exp $ 2.\" 3.\" Copyright (c) 2006 Frank Kardel. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24.\" 25.Dd June 24, 2006 26.Dt GEODECNTR 4 27.Os 28.Sh NAME 29.Nm geodecntr 30.Nd AMD Geode SC1100 High Resolution Counter 31.Sh SYNOPSIS 32.Cd "geodegcb* at pci? dev ? function ?" 33.Cd "geodecntr* at geodegcb?" 34.Sh DESCRIPTION 35The 36.Nm 37driver supports the 38.Tn AMD 39SC1100 40controllers 41and provides a timecounter implementation for the 27MHz 42counter. 43.Pp 44The other timing sources in the SC1100 suffer from 45power management features that prohibit i8254 and TSC 46from being used for time keeping. 47This 48.Nm 49driver 50makes the 27MHz counter available for the 51.Xr timecounter 9 52framework. 53.Sh SEE ALSO 54.Xr timecounter 9 55