xref: /src/sys/arch/arc/isa/mcclock_isa.c

/*	$NetBSD: mcclock_isa.c,v 1.1.2.1 2001/06/21 19:18:31 nathanw Exp $	*/
/*	$OpenBSD: clock_mc.c,v 1.9 1998/03/16 09:38:26 pefo Exp $	*/
/*	NetBSD: clock_mc.c,v 1.2 1995/06/28 04:30:30 cgd Exp 	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and Ralph Campbell.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah Hdr: clock.c 1.18 91/01/21
 *
 *	@(#)clock.c	8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <machine/bus.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>

#include <dev/ic/mc146818reg.h>

#include <arc/dev/mcclockvar.h>
#include <arc/isa/mcclock_isavar.h>

#define ARC_IO_RTCSIZE	2

int mcclock_isa_match __P((struct device *, struct cfdata *, void *));
void mcclock_isa_attach __P((struct device *, struct device *, void *));

struct cfattach mcclock_isa_ca = {
	sizeof(struct mcclock_softc),
	mcclock_isa_match, mcclock_isa_attach
};

/* Deskstation clock access code */
u_int mc_isa_read __P((struct mcclock_softc *, u_int));
void mc_isa_write __P((struct mcclock_softc *, u_int, u_int));

struct mcclock_busfns mcclock_isa_busfns = {
	mc_isa_read, mc_isa_write
};

int mcclock_isa_conf = 0;

int
mcclock_isa_match(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct isa_attach_args *ia = aux;
	bus_space_handle_t ioh;
	bus_addr_t iobase = IO_RTC;
	bus_size_t iosize = ARC_IO_RTCSIZE;

	if (ia->ia_iobase != IOBASEUNK)
		iobase = ia->ia_iobase;
#if 0	/* XXX isa.c */
	if (ia->ia_iosize != 0)
		iosize = ia->ia_iosize;
#endif

	if (iobase != IO_RTC || iosize != ARC_IO_RTCSIZE ||
	    ia->ia_maddr != MADDRUNK || ia->ia_msize != 0 ||
	    ia->ia_irq != IRQUNK || ia->ia_drq != DRQUNK)
		return (0);

	if (!mcclock_isa_conf)
		return (0);

	if (bus_space_map(ia->ia_iot, iobase, iosize, 0, &ioh))
		return (0);

	bus_space_unmap(ia->ia_iot, ioh, iosize);

	ia->ia_iobase = iobase;
	ia->ia_iosize = iosize;

	return (1);
}

void
mcclock_isa_attach(parent, self, aux)
	struct device *parent;
	struct device *self;
	void *aux;
{
	struct mcclock_softc *sc = (struct mcclock_softc *)self;
	struct isa_attach_args *ia = aux;

	sc->sc_iot = ia->ia_iot;
	if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0,
	    &sc->sc_ioh))
		panic("mcclock_isa_attach: couldn't map clock I/O space");

	mcclock_attach(sc, &mcclock_isa_busfns, 80);

	/* Turn interrupts off, just in case. */
	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
}

u_int
mc_isa_read(sc, reg)
	struct mcclock_softc *sc;
	u_int reg;
{

	bus_space_write_1(sc->sc_iot, sc->sc_ioh, 0, reg);
	return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, 1));
}

void
mc_isa_write(sc, reg, datum)
	struct mcclock_softc *sc;
	u_int reg, datum;
{

	bus_space_write_1(sc->sc_iot, sc->sc_ioh, 0, reg);
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, 1, datum);
}