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An mc146818a clock attached to an isa bus.

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This commit is contained in:
Doug Rabson 1998-07-15 19:21:31 +00:00
parent 28c3132268
commit a6481f0baf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=37685
1 changed files with 105 additions and 0 deletions
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sys/alpha/isa/mcclock_isa.c Normal file
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/* $Id$ */
/* $NetBSD: mcclock_tlsb.c,v 1.8 1998/05/13 02:50:29 thorpej Exp $ */
/*
* Copyright (c) 1997 by Matthew Jacob
* NASA AMES Research Center.
* 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 immediately at the beginning of the file, without modification,
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/clockvar.h>
#include <dev/dec/mcclockvar.h>
#include <dev/dec/mc146818reg.h>
static int mcclock_isa_probe(device_t dev);
static int mcclock_isa_attach(device_t dev);
static void mcclock_isa_write(device_t, u_int, u_int);
static u_int mcclock_isa_read(device_t, u_int);
static device_method_t mcclock_isa_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mcclock_isa_probe),
DEVMETHOD(device_attach, mcclock_isa_attach),
/* mcclock interface */
DEVMETHOD(mcclock_write, mcclock_isa_write),
DEVMETHOD(mcclock_read, mcclock_isa_read),
/* clock interface */
DEVMETHOD(clock_init, mcclock_init),
DEVMETHOD(clock_get, mcclock_get),
DEVMETHOD(clock_set, mcclock_set),
{ 0, 0 }
};
static driver_t mcclock_isa_driver = {
"mcclock",
mcclock_isa_methods,
DRIVER_TYPE_MISC,
1, /* XXX no softc */
};
static devclass_t mcclock_devclass;
int
mcclock_isa_probe(device_t dev)
{
device_set_desc(dev, "MC146818A real time clock");
return 0;
}
int
mcclock_isa_attach(device_t dev)
{
mcclock_attach(dev);
return 0;
}
static void
mcclock_isa_write(device_t dev, u_int reg, u_int val)
{
outb(0x70, reg);
outb(0x71, val);
}
static u_int
mcclock_isa_read(device_t dev, u_int reg)
{
outb(0x70, reg);
return inb(0x71);
}
/* XXX put it on the root for now, later on isa */
DRIVER_MODULE(mcclock_isa, root, mcclock_isa_driver, mcclock_devclass, 0, 0);