NetBSD/sys/arch/i386/pci/joy_pci.c

/*	$NetBSD: joy_pci.c,v 1.2 2001/11/15 07:03:33 lukem Exp $	*/

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Martin Husemann
 *
 * 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 NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: joy_pci.c,v 1.2 2001/11/15 07:03:33 lukem Exp $");

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

#include <machine/bus.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include <i386/isa/joyvar.h>

int	joy_pci_match __P((struct device *, struct cfdata *, void *));
void	joy_pci_attach __P((struct device *, struct device *, void *));
static int bar_is_io __P((pci_chipset_tag_t pc, pcitag_t tag, int reg));

struct cfattach pci_joy_ca = {
	sizeof(struct joy_softc), joy_pci_match, joy_pci_attach
};

int
joy_pci_match(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct pci_attach_args *pa = aux;

	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_INPUT &&
	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_INPUT_GAMEPORT &&
	    PCI_INTERFACE(pa->pa_class) == 0x10)
		return (1);

	return (0);
}

/* check if this BAR assigns/requests IO space */
static int
bar_is_io(pc, tag, reg)
        pci_chipset_tag_t pc;
        pcitag_t tag;
        int reg;
{
	pcireg_t address, mask;
	int s;

	/*
	 * The splhigh() is not realy necessary at autoconfig time,
	 * but maybe useful if used in lkm context later.
	 */
	s = splhigh();
	address = pci_conf_read(pc, tag, reg);
	pci_conf_write(pc, tag, reg, 0xffffffff);
	mask = pci_conf_read(pc, tag, reg);
	pci_conf_write(pc, tag, reg, address);
	splx(s);

	return (PCI_MAPREG_TYPE(address) == PCI_MAPREG_TYPE_IO && PCI_MAPREG_IO_SIZE(mask) > 0);
}

void
joy_pci_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct joy_softc *sc = (struct joy_softc *)self;
	struct pci_attach_args *pa = aux;
	char devinfo[256];
	bus_size_t mapsize;
	int reg;

	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
	printf(": %s (rev 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));

	for (reg = PCI_MAPREG_START; reg < PCI_MAPREG_END; reg++)
		if (bar_is_io(pa->pa_pc, pa->pa_tag, reg))
			break;
	if (reg >= PCI_MAPREG_END) {
		printf("%s: violates PCI spec, no IO region found\n", sc->sc_dev.dv_xname);
		return;
	}

	if (pci_mapreg_map(pa, reg, PCI_MAPREG_TYPE_IO, 0,
	    &sc->sc_iot, &sc->sc_ioh, NULL, &mapsize)) {
		printf("%s: could not map IO space\n", sc->sc_dev.dv_xname);
		return;
	}

	if (mapsize != 2) {
		if (!bus_space_subregion(sc->sc_iot, sc->sc_ioh, 1, 1, &sc->sc_ioh) < 0) {
			printf("%s: error mapping subregion\n", sc->sc_dev.dv_xname);
			return;
		}
	}

	joyattach(sc);
}