1.\" $OpenBSD: gscsio.4,v 1.6 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt GSCSIO 4 19.Os 20.Sh NAME 21.Nm gscsio 22.Nd National Semiconductor Geode SC1100 I2C controller 23.Sh SYNOPSIS 24.Cd "gscsio* at isa?" 25.Cd "iic* at gscsio?" 26.Sh DESCRIPTION 27The 28.Nm 29driver provides support for the National Semiconductor Geode SC1100 30System-on-Chip Super I/O module. 31The Super I/O (SIO) module incorporates one serial port, an infrared 32communication port, two ACCESS.bus interface (ACB) ports, system wakeup 33control (SWC), and a real-time clock (RTC). 34Only the ACCESS.bus interface is currently supported. 35.Pp 36ACB is a two-wire synchronous serial interface compatible with the 37Philips' 38.Tn I2C 39bus, and can be accessed through the 40.Xr iic 4 41framework. 42The 43.Nm 44driver 45programs the ACB port to work with a standard 46.Tn I2C 47frequency 100kHz. 48.Sh SEE ALSO 49.Xr iic 4 , 50.Xr intro 4 , 51.Xr isa 4 52.Sh HISTORY 53The 54.Nm 55driver first appeared in 56.Ox 3.6 . 57.Sh AUTHORS 58The 59.Nm 60driver was written by 61.An Alexander Yurchenko Aq Mt grange@openbsd.org . 62