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joy_pci.c revision 1.4 
      1 /*	$NetBSD: joy_pci.c,v 1.4 2002/09/30 20:37:49 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Martin Husemann <martin (at) netbsd.org>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: joy_pci.c,v 1.4 2002/09/30 20:37:49 thorpej Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/kernel.h>
     45 #include <sys/device.h>
     46 
     47 #include <machine/bus.h>
     48 
     49 #include <dev/pci/pcireg.h>
     50 #include <dev/pci/pcivar.h>
     51 #include <dev/pci/pcidevs.h>
     52 
     53 #include <dev/ic/joyvar.h>
     54 
     55 int	joy_pci_match __P((struct device *, struct cfdata *, void *));
     56 void	joy_pci_attach __P((struct device *, struct device *, void *));
     57 static int bar_is_io __P((pci_chipset_tag_t pc, pcitag_t tag, int reg));
     58 
     59 CFATTACH_DECL(joy_pci, sizeof(struct joy_softc),
     60     joy_pci_match, joy_pci_attach, NULL, NULL)
     61 
     62 int
     63 joy_pci_match(parent, match, aux)
     64 	struct device *parent;
     65 	struct cfdata *match;
     66 	void *aux;
     67 {
     68 	struct pci_attach_args *pa = aux;
     69 
     70 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_INPUT &&
     71 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_INPUT_GAMEPORT &&
     72 	    PCI_INTERFACE(pa->pa_class) == 0x10)
     73 		return (1);
     74 
     75 	return (0);
     76 }
     77 
     78 /* check if this BAR assigns/requests IO space */
     79 static int
     80 bar_is_io(pc, tag, reg)
     81         pci_chipset_tag_t pc;
     82         pcitag_t tag;
     83         int reg;
     84 {
     85 	pcireg_t address, mask;
     86 	int s;
     87 
     88 	/*
     89 	 * The splhigh() is not realy necessary at autoconfig time,
     90 	 * but maybe useful if used in lkm context later.
     91 	 */
     92 	s = splhigh();
     93 	address = pci_conf_read(pc, tag, reg);
     94 	pci_conf_write(pc, tag, reg, 0xffffffff);
     95 	mask = pci_conf_read(pc, tag, reg);
     96 	pci_conf_write(pc, tag, reg, address);
     97 	splx(s);
     98 
     99 	return (PCI_MAPREG_TYPE(address) == PCI_MAPREG_TYPE_IO && PCI_MAPREG_IO_SIZE(mask) > 0);
    100 }
    101 
    102 void
    103 joy_pci_attach(parent, self, aux)
    104 	struct device *parent, *self;
    105 	void *aux;
    106 {
    107 	struct joy_softc *sc = (struct joy_softc *)self;
    108 	struct pci_attach_args *pa = aux;
    109 	char devinfo[256];
    110 	bus_size_t mapsize;
    111 	int reg;
    112 
    113 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
    114 	printf(": %s (rev 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
    115 
    116 	for (reg = PCI_MAPREG_START; reg < PCI_MAPREG_END; reg++)
    117 		if (bar_is_io(pa->pa_pc, pa->pa_tag, reg))
    118 			break;
    119 	if (reg >= PCI_MAPREG_END) {
    120 		printf("%s: violates PCI spec, no IO region found\n", sc->sc_dev.dv_xname);
    121 		return;
    122 	}
    123 
    124 	if (pci_mapreg_map(pa, reg, PCI_MAPREG_TYPE_IO, 0,
    125 	    &sc->sc_iot, &sc->sc_ioh, NULL, &mapsize)) {
    126 		printf("%s: could not map IO space\n", sc->sc_dev.dv_xname);
    127 		return;
    128 	}
    129 
    130 	if (mapsize != 2) {
    131 		if (!bus_space_subregion(sc->sc_iot, sc->sc_ioh, 1, 1, &sc->sc_ioh) < 0) {
    132 			printf("%s: error mapping subregion\n", sc->sc_dev.dv_xname);
    133 			return;
    134 		}
    135 	}
    136 
    137 	joyattach(sc);
    138 }
    139