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.\" $OpenBSD: tcpcib.4,v 1.6 2014/11/15 14:41:02 bentley Exp $
.\"
.\" Copyright (c) 2012 Matt Dainty <matt@bodgit-n-scarper.com>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: November 15 2014 $
.Dt TCPCIB 4 amd64
.Os
.Sh NAME
.Nm tcpcib
.Nd Intel Atom E600 series LPC bridge, timecounter and watchdog timer
.Sh SYNOPSIS
.Cd "tcpcib* at pci?"
.Cd "isa* at tcpcib?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the Intel Atom E600 series LPC bridge and
implements a 64-bit 14.3 MHz timecounter using the HPET timer.
.Pp
The
.Nm
driver also provides the standard
.Xr watchdog 4
interface to the watchdog timer and may be used with
.Xr watchdogd 8 .
The watchdog timer can be configured via
.Xr sysctl 8 .
.Pp
Once the watchdog timer resets the CPU, the driver reports it on the
next boot displaying the
.Dq reboot on timeout
message in the
.Xr dmesg 8 .
.Pp
The maximum timeout value supported by the watchdog timer is 600
seconds.
.Sh SEE ALSO
.Xr intro 4 ,
.Xr isa 4 ,
.Xr pci 4 ,
.Xr watchdog 4 ,
.Xr sysctl 8 ,
.Xr watchdogd 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 5.2 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Matt Dainty Aq Mt matt@bodgit-n-scarper.com .
.Sh BUGS
Apart from the core
.Xr pcib 4
functionality, timecounter and the
.Xr watchdog 4
interface, the driver doesn't support any other aspects of the hardware.
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