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+.\"	$NetBSD: elansc.4,v 1.16 2020/08/24 19:36:32 ryoon Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe.
+.\"
+.\" 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.
+.\"
+.Dd August 25, 2020
+.Dt ELANSC 4 i386
+.Os
+.Sh NAME
+.Nm elansc
+.Nd AMD Elan SC520 System Controller driver
+.Sh SYNOPSIS
+.Cd "elansc* at mainbus? bus ?"
+.Cd "gpio* at elansc?"
+.Cd "pci* at elansc?"
+.Cd "elanpar* at elansc?"
+.Cd "elanpex* at elansc?"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports the system controller of the AMD Elan SC520 microcontroller.
+The SC520 consists of an AMD Am5x86 processor core, integrated PCI host
+controller, and several standard on-chip devices, such as NS16550-compatible
+UARTs, real-time clock, and timers.
+.Pp
+The Elan SC520 also provides several special on-chip devices.
+The following are supported by the
+.Nm
+driver:
+.Bl -bullet
+.It
+Watchdog timer.
+The watchdog timer may be configured for a 1
+second, 2 second, 4 second, 8 second, 16 second, or 32 second
+expiration period.
+.It
+PCI exceptions reporting.
+The SC520 microcontroller can report exceptions that occur as it
+acts as both a PCI bus master and a bus target.
+See
+.Xr i386/elanpex 4 .
+.It
+RAM write-protection.
+The SC520 microcontroller can designate write-protected regions of RAM using
+the Programmable Address Regions registers.
+See
+.Xr i386/elanpar 4 .
+.It
+Programmable Input/Output.
+The SC520 microcontroller supports 32 programmable I/O signals (PIOs)
+that can be used on the system board to monitor signals or control devices
+that are not handled by the other functions in the SC520 microcontroller.
+These signals can be programmed to be inputs or to be driven
+.Dq high
+or
+.Dq low
+as outputs.
+Pins can be accessed through the
+.Xr gpio 4
+framework.
+The
+.Xr gpioctl 8
+program allows easy manipulation of pins from userland.
+.It
+PCI host-bridge optimization.
+.Nm
+takes advantage of a suspend/resume cycle to tune the PCI host-bridge
+for higher performance.
+.El
+.Sh SEE ALSO
+.Xr gpio 4 ,
+.Xr i386/elanpar 4 ,
+.Xr i386/elanpex 4 ,
+.Xr gpioctl 8 ,
+.Xr wdogctl 8
+.Sh HISTORY
+The
+.Nm
+device first appeared in
+.Nx 2.0 .
+PIO function support was added in
+.Ox 3.6 ,
+and subsequently ported to
+.Nx 4.0 .
+Support for PCI exceptions reporting and for RAM write-protection
+first appeared in
+.Nx 5.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Jason R. Thorpe Aq Mt thorpej@NetBSD.org .
+.An Jasper Wallace
+provided the work-around for a hardware bug related to the watchdog timer
+in some steppings of the SC520 CPU.
+Support for the PIO function was added to
+.Ox 3.6
+by
+.An Alexander Yurchenko Aq Mt grange@openbsd.org
+and was ported to
+.Nx
+by
+.An Jeff Rizzo Aq Mt riz@NetBSD.org .
+.An David Young Aq Mt dyoung@NetBSD.org
+added support for PCI exceptions reporting and for RAM write-protection
+using the Programmable Address Regions.