NetBSD/sys/arch/x68k/dev/neptune.c

/*	$NetBSD: neptune.c,v 1.2 1999/03/16 16:30:20 minoura Exp $	*/

/*
 *
 * Copyright (c) 1998 NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Minoura Makoto.
 *
 * 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 Charles D. Cranor and
 *      Washington University.
 * 4. 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 ``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 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.
 */

/*
 * Neptune-X -- X68k-ISA Bus Bridge
 */

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

#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>

#include <arch/x68k/dev/intiovar.h>
#include <arch/x68k/dev/neptunevar.h>

/* bus_space stuff */
static int neptune_bus_space_map __P((bus_space_tag_t, bus_addr_t, bus_size_t,
				      int, bus_space_handle_t*));
static void neptune_bus_space_unmap __P((bus_space_tag_t,
					 bus_space_handle_t, bus_size_t));
static int neptune_bus_space_subregion __P((bus_space_tag_t, bus_space_handle_t,
					    bus_size_t, bus_size_t,
					    bus_space_handle_t*));

static struct x68k_bus_space neptune_bus = {
#if 0
	X68K_NEPUTUNE_BUS,
#endif
	neptune_bus_space_map, neptune_bus_space_unmap,
	neptune_bus_space_subregion,
	x68k_bus_space_alloc, x68k_bus_space_free,
};


static int neptune_match __P((struct device *, struct cfdata *, void *));
static void neptune_attach __P((struct device *, struct device *, void *));
static int neptune_search __P((struct device *, struct cfdata *cf, void *));
static int neptune_print __P((void *, const char *));

struct cfattach neptune_ca = {
	sizeof(struct neptune_softc), neptune_match, neptune_attach
};

static int
neptune_match(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{
	struct intio_attach_args *ia = aux;

	if (strcmp(ia->ia_name, "neptune") != 0)
		return 0;

	ia->ia_size = 0x400;
	if (intio_map_allocate_region (parent, ia, INTIO_MAP_TESTONLY))
		return 0;

	/* Neptune is a virtual device.  Always there. */

	return (1);
}


static void
neptune_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct neptune_softc *sc = (struct neptune_softc *)self;
	struct intio_attach_args *ia = aux;
	struct neptune_attach_args na;
	int r;
	struct cfdata *cf;

	ia->ia_size = 0x400;
	r = intio_map_allocate_region (parent, ia, INTIO_MAP_ALLOCATE);
#ifdef DIAGNOSTIC
	if (r)
		panic ("IO map for Neptune corruption??");
#endif

	sc->sc_bst = malloc(sizeof(struct x68k_bus_space), M_DEVBUF, M_NOWAIT);
	if (sc->sc_bst == NULL)
		panic("neptune_attach: can't allocate bus_space structure");
	*sc->sc_bst = neptune_bus;
	sc->sc_bst->x68k_bus_device = self;

	sc->sc_addr = (vaddr_t) (ia->ia_addr - PHYS_INTIODEV + intiobase);

	na.na_bst = sc->sc_bst;
	na.na_intr = ia->ia_intr;

	cf = config_search (neptune_search, self, &na);
	if (cf) {
		printf (": Neptune-X ISA bridge\n");
		config_attach(self, cf, &na, neptune_print);
	} else {
		printf (": no device found.\n");
		intio_map_free_region(parent, ia);
	}
}

static int
neptune_search(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{
	struct neptune_attach_args *na = aux;

	na->na_addr = cf->neptune_cf_addr;

	return (*cf->cf_attach->ca_match)(parent, cf, na);
}

static int
neptune_print(aux, name)
	void *aux;
	const char *name;
{
	struct neptune_attach_args *na = aux;

/*	if (na->na_addr > 0)	*/
		printf (" addr 0x%06x", na->na_addr);

	return (QUIET);
}


/*
 * neptune bus space stuff.
 */
static int
neptune_bus_space_map(t, bpa, size, flags, bshp)
	bus_space_tag_t t;
	bus_addr_t bpa;
	bus_size_t size;
	int flags;
	bus_space_handle_t *bshp;
{
	vaddr_t start = ((struct neptune_softc*) ((struct x68k_bus_space*) t)
			 ->x68k_bus_device)->sc_addr;

	/*
	 * Neptune bus is mapped permanently.
	 */
	*bshp = (bus_space_handle_t) ((u_int)start + ((u_int)bpa - 0x200) * 2);

	if (badaddr(*bshp)) {
		return 1;
	}

	*bshp |= 0x80000000;	/* higher byte (= even address) only */

	return (0);
}

static void
neptune_bus_space_unmap(t, bsh, size)
	bus_space_tag_t t;
	bus_space_handle_t bsh;
	bus_size_t size;
{
	return;
}

static int
neptune_bus_space_subregion(t, bsh, offset, size, nbshp)
	bus_space_tag_t t;
	bus_space_handle_t bsh;
	bus_size_t offset, size;
	bus_space_handle_t *nbshp;
{

	*nbshp = bsh + offset*2;
	return (0);
}