mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
0d9deed52c
They have no effect when coming in pairs, or before .Bl/.Bd
229 lines
6.1 KiB
Groff
229 lines
6.1 KiB
Groff
.\" $NetBSD: mk48txx.4,v 1.16 2009/04/10 17:14:07 joerg Exp $
|
|
.\"
|
|
.\" Copyright (c) 2000, 2002 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Paul Kranenburg.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 25, 2009
|
|
.Dt MK48TXX 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mk48txx
|
|
.Nd
|
|
.Tn Mostek
|
|
time-of-day clock driver
|
|
.Sh SYNOPSIS
|
|
.In sys/eventhandler.h
|
|
.In sys/lock.h
|
|
.In sys/mutex.h
|
|
.In dev/mk48txx/mk48txxvar.h
|
|
.Pp
|
|
To compile this driver into the kernel,
|
|
place the following line in your
|
|
kernel configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "device mk48txx"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver is a back-end for several models of
|
|
.Tn Mostek
|
|
time-of-day clock chips.
|
|
It provides access methods to retrieve and set date and time for use with the
|
|
.Dq Li clock
|
|
KOBJ interface.
|
|
.Pp
|
|
To tie an instance of this device to the system, use the
|
|
.Fn mk48txx_attach
|
|
function and the mk48txx_softc structure defined as follows:
|
|
.Pp
|
|
.Ft "int"
|
|
.Fn mk48txx_attach "device_t dev"
|
|
.Bd -literal
|
|
typedef uint8_t (*mk48txx_nvrd_t)(device_t dev, int off);
|
|
typedef void (*mk48txx_nvwr_t)(device_t dev, int off, uint8_t v);
|
|
.Ed
|
|
.Bd -literal
|
|
struct mk48txx_softc {
|
|
struct resource sc_res;
|
|
struct mtx sc_mtx;
|
|
eventhandler_tag sc_wet;
|
|
const char *sc_model;
|
|
bus_size_t sc_nvramsz;
|
|
bus_size_t sc_clkoffset;
|
|
u_int sc_year0;
|
|
u_int sc_flag;
|
|
mk48txx_nvrd_t sc_nvrd;
|
|
mk48txx_nvwr_t sc_nvwr;
|
|
};
|
|
.Ed
|
|
.Bl -tag -width indent
|
|
.It Fa sc_res
|
|
The bus resource used for accessing the chip's non-volatile memory
|
|
.Pq including the clock registers ,
|
|
which must be supplied by the front-end when using the default access methods
|
|
.Pq see below .
|
|
Otherwise this member is optional.
|
|
.It Fa sc_mtx
|
|
The hardware mutex used when accessing the chip's non-volatile memory
|
|
.Pq including the clock registers ,
|
|
which must be initialized with
|
|
.Dv MTX_DEF
|
|
by the front-end.
|
|
.It Fa sc_wet
|
|
The event handler tag for the watchdog functionality,
|
|
which is registered by the
|
|
.Fn mk48txx_attach
|
|
function if supported by the chip and specified as part of the
|
|
machine-dependent features
|
|
.Pq see below .
|
|
.It Fa sc_model
|
|
The chip model which this instance should serve.
|
|
This member must be set to one of
|
|
.Dq mk48t02 ,
|
|
.Dq mk48t08 ,
|
|
.Dq mk48t18 ,
|
|
or
|
|
.Dq mk48t59
|
|
by the front-end.
|
|
.It Fa sc_nvramsz
|
|
The size of the non-volatile RAM in the
|
|
.Tn Mostek
|
|
chip,
|
|
which is set by the
|
|
.Fn mk48txx_attach
|
|
function.
|
|
.It Fa sc_clkoffset
|
|
The offset into the control registers of the
|
|
.Tn Mostek
|
|
chip,
|
|
which is set by the the
|
|
.Fn mk48txx_attach
|
|
function.
|
|
.It Fa sc_year0
|
|
The year offset to be used with the
|
|
.Sq year
|
|
counter of the clock,
|
|
which must be set by the front-end.
|
|
This value is generally dependent on the system configuration in which
|
|
the clock device is mounted.
|
|
For instance, on
|
|
.Tn Sun Microsystems
|
|
machines the convention is to have clock's two-digit year represent
|
|
the year since 1968.
|
|
.It Fa sc_flag
|
|
This flag is used to specify machine-dependent features.
|
|
The following flags are supported:
|
|
.Bl -tag -width ".Dv MK48TXX_WDOG_ENABLE_WDS"
|
|
.It Dv MK48TXX_NO_CENT_ADJUST
|
|
If the resulting date retrieved with the
|
|
.Dq Li clock_gettime() method
|
|
would be earlier than January 1, 1970,
|
|
the driver will assume that the chip's year counter actually represents a
|
|
year in the 21st century.
|
|
This behavior can be overridden by setting this flag,
|
|
which causes the
|
|
.Nm
|
|
driver to respect the clock's century bit instead.
|
|
.It Dv MK48TXX_WDOG_REGISTER
|
|
When this flag is set,
|
|
the
|
|
.Nm
|
|
driver will register as a watchdog via the interface defined in
|
|
.Xr watchdog 9
|
|
if supported by the specific chip model.
|
|
.It Dv MK48TXX_WDOG_ENABLE_WDS
|
|
When this flag is set,
|
|
the
|
|
.Nm
|
|
driver will set the watchdog steering
|
|
.Pq WDS
|
|
bit when enabling the watchdog functionality of the chip.
|
|
enabled
|
|
.Pq see the chip documentation for further information regarding the WDS bit .
|
|
.El
|
|
.It Fa sc_nvread
|
|
.It Fa sc_nvwrite
|
|
These members specify the access methods for reading respectively writing
|
|
clock device registers.
|
|
The default,
|
|
when
|
|
.Dv NULL
|
|
is passed as an access method,
|
|
is to access the chip memory
|
|
.Pq and clock registers
|
|
as if they were direct-mapped using the specified bus resource.
|
|
.Pp
|
|
Otherwise, the driver will call the respective function supplied by the
|
|
front-end to perform the access,
|
|
passing it the offset
|
|
.Va off
|
|
of the chip memory
|
|
.Pq or clock register
|
|
location to be read from or written to, respectively.
|
|
.El
|
|
.Sh HARDWARE
|
|
The following models are supported:
|
|
.Pp
|
|
.Bl -tag -width indent -offset indent -compact
|
|
.It Tn Mostek MK48T02
|
|
.It Tn Mostek MK48T08
|
|
.It Tn Mostek MK48T18
|
|
.It Tn Mostek MK48T59
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr intro 4 ,
|
|
.Xr watchdog 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm mk48txx
|
|
driver appeared in
|
|
.Nx 1.5 .
|
|
The first
|
|
.Fx
|
|
version to include it was
|
|
.Fx 5.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
driver was written for
|
|
.Nx
|
|
by
|
|
.An Paul Kranenburg
|
|
.Aq pk@NetBSD.org .
|
|
It was ported to
|
|
.Fx
|
|
by
|
|
.An Thomas Moestl
|
|
.Aq tmm@FreeBSD.org
|
|
and later on improved by
|
|
.An Marius Strobl
|
|
.Aq marius@FreeBSD.org .
|