73 lines
2.7 KiB
Groff
73 lines
2.7 KiB
Groff
.\" $NetBSD: nct.4,v 1.2 2019/10/28 13:38:03 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 2019 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Andrew Doran.
|
|
.\"
|
|
.\" 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 October 14, 2019
|
|
.Dt NCT 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm nct
|
|
.Nd Nuvoton NCT5104D SuperIO driver
|
|
.Sh SYNOPSIS
|
|
.Cd "nct0 at isa? port ?"
|
|
.Cd "nct0 at isa? port 0x2e"
|
|
.Cd "nct0 at isa? port 0x4e"
|
|
.Cd "gpio* at nct?"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver supports the GPIO functions of the NCT5104D.
|
|
The driver does not support the watchdog function of the chip.
|
|
The chip's UARTs are driven by the
|
|
.Xr com 4
|
|
driver.
|
|
.Pp
|
|
The probe routine for this device is invasive.
|
|
The chip will be probed for only if the device is configured into the kernel
|
|
with a fixed port number (0x2e or 0x4e), or if running on a system that
|
|
is known to have a NCT5104D, such as the PC Engines APU line of systems.
|
|
.Pp
|
|
GPIO pins on this chip are shared with the 3rd UART, 4th UART, a clock
|
|
input line, and the watchdog timer.
|
|
If any these functions have been enabled by the BIOS, the
|
|
.Nm
|
|
driver will not take control of the corresponding GPIO lines.
|
|
At attach time, the driver logs which of the 17 GPIO lines are enabled.
|
|
.Sh SEE ALSO
|
|
.Xr gpio 4 ,
|
|
.Xr isa 4 ,
|
|
.Xr gpioctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Nx 9 .
|
|
.Sh CAVEATS
|
|
If the chip has not been configured in a complete and accurate manner by
|
|
the BIOS, GPIO lines may be needlessly disabled.
|