amdsbwd: new driver for AMD SB600/SB7xx watchdog timer

The hardware is compliant with WDRT specification, so I originally
considered including generic WDRT watchdog support, but decided
against it, because I couldn't find anyone to the code for me.
WDRT seems to be not very popular.
Besides, generic WDRT porbably requires a slightly different driver
approach.

Reviewed by:	des, gavin, rpaulo
MFC after:	3 weeks

2 files changed, 74 insertions, 0 deletions

diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index 4d43530..3f7acfb 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -31,6 +31,7 @@ MAN=	aac.4 \
 	ale.4 \
 	altq.4 \
 	amd.4 \
+	${_amdsbwd.4} \
 	${_amdsmb.4} \
 	${_amdtemp.4} \
 	amr.4 \
@@ -610,6 +611,7 @@ _acpi_panasonic.4=acpi_panasonic.4
 _acpi_sony.4=	acpi_sony.4
 _acpi_toshiba.4=acpi_toshiba.4
 _acpi_wmi.4=	acpi_wmi.4
+_amdsbwd.4=	amdsbwd.4
 _amdsmb.4=	amdsmb.4
 _amdtemp.4=	amdtemp.4
 _asmc.4=	asmc.4
diff --git a/share/man/man4/amdsbwd.4 b/share/man/man4/amdsbwd.4
new file mode 100644
index 0000000..370cfa8
--- /dev/null
+++ b/share/man/man4/amdsbwd.4
@@ -0,0 +1,72 @@
+.\"-
+.\" Copyright (c) 2009 Andriy Gapon
+.\" All rights reserved.
+.\"
+.\" 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 AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 30, 2009
+.Dt AMDSBWD 4
+.Os
+.Sh NAME
+.Nm amdsbwd
+.Nd device driver for the AMD SB600/SB700/SB710/SB750 watchdog timer
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device amdsbwd"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+amdsbwd_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides
+.Xr watchdog 4
+support for the watchdog timers present on
+AMD SB600 and SB7xx south bridge chips.
+.Sh SEE ALSO
+.Xr watchdog 4 ,
+.Xr watchdog 8 ,
+.Xr watchdogd 8 ,
+.Xr watchdog 9
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 9.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Andiry Gapon Aq avg@FreeBSD.org .
+This manual page was written by
+.An Andiry Gapon Aq avg@FreeBSD.org .