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

/*	$NetBSD: mcclock_isa.c,v 1.14 2011/02/08 20:20:09 rmind 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. 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mcclock_isa.c,v 1.14 2011/02/08 20:20:09 rmind Exp $");

#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/clock_subr.h>

#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>

#include <arc/isa/mcclock_isavar.h>

int mcclock_isa_match(device_t, cfdata_t, void *);
void mcclock_isa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mc146818_softc),
    mcclock_isa_match, mcclock_isa_attach, NULL, NULL);

/* Deskstation clock access code */
static u_int mc_isa_read(struct mc146818_softc *, u_int);
static void mc_isa_write(struct mc146818_softc *, u_int, u_int);

int mcclock_isa_conf = 0;

int
mcclock_isa_match(device_t parent, cfdata_t cf, void *aux)
{
	struct isa_attach_args *ia = aux;
	bus_space_handle_t ioh;

	if (ia->ia_nio < 1 ||
	    (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
	     ia->ia_io[0].ir_addr != 0x70))
		return 0;

	if (ia->ia_niomem > 0 &&
	    (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
		return 0;

	if (ia->ia_nirq > 0 &&
	    (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
		return 0;

	if (ia->ia_ndrq > 0 &&
	    (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
		return 0;

	if (!mcclock_isa_conf)
		return 0;

	if (bus_space_map(ia->ia_iot, 0x70, 0x02, 0, &ioh))
		return 0;

	bus_space_unmap(ia->ia_iot, ioh, 0x02);

	ia->ia_nio = 1;
	ia->ia_io[0].ir_addr = 0x70;
	ia->ia_io[0].ir_size = 0x02;

	ia->ia_niomem = 0;
	ia->ia_nirq = 0;
	ia->ia_ndrq = 0;

	return 1;
}

void
mcclock_isa_attach(device_t parent, device_t self, void *aux)
{
	struct mc146818_softc *sc = device_private(self);
	struct isa_attach_args *ia = aux;

	sc->sc_dev = self;
	sc->sc_bst = ia->ia_iot;
	if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
	    ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
		panic("mcclock_isa_attach: couldn't map clock I/O space");

	sc->sc_year0 = 1980;
	sc->sc_mcread  = mc_isa_read;
	sc->sc_mcwrite = mc_isa_write;

	mc146818_attach(sc);

	aprint_normal("\n");

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

u_int
mc_isa_read(struct mc146818_softc *sc, u_int reg)
{

	bus_space_write_1(sc->sc_bst, sc->sc_bsh, 0, reg);
	return bus_space_read_1(sc->sc_bst, sc->sc_bsh, 1);
}

void
mc_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
{

	bus_space_write_1(sc->sc_bst, sc->sc_bsh, 0, reg);
	bus_space_write_1(sc->sc_bst, sc->sc_bsh, 1, datum);
}