Home | History | Annotate | Line # | Download | only in pci
ppb.c revision 1.1 
      1 /*	$NetBSD: ppb.c,v 1.1 1996/02/28 01:46:32 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *      This product includes software developed by Christopher G. Demetriou
     17  *	for the NetBSD Project.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * XXX NOTE:
     35  * XXX PROPER OPERATION OF DEVICES BEHIND PPB'S WHICH USE INTERRUPTS
     36  * XXX ON SYSTEMS OTHER THAN THE i386 IS NOT POSSIBLE AT THIS TIME.
     37  * XXX There needs to be some support for 'swizzling' the interrupt
     38  * XXX pin.  In general, pci_map_int() has to have a different
     39  * XXX interface.
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/kernel.h>
     45 #include <sys/device.h>
     46 
     47 #include <dev/pci/pcireg.h>
     48 #include <dev/pci/pcivar.h>
     49 #include <dev/pci/pcidevs.h>
     50 #include <dev/pci/ppbreg.h>
     51 
     52 struct ppb_softc {
     53 	struct device sc_dev;
     54 
     55 	/*
     56 	 * Primary bus information.
     57 	 */
     58 	pcitag_t	sc_p_tag;		/* tag of this device */
     59 
     60 	/*
     61 	 * Secondary bus information.
     62 	 */
     63 	int		sc_s_num;		/* secondary bus number */
     64 };
     65 
     66 int	ppbmatch __P((struct device *, void *, void *));
     67 void	ppbattach __P((struct device *, struct device *, void *));
     68 
     69 struct cfdriver ppbcd = {
     70 	NULL, "ppb", ppbmatch, ppbattach, DV_DULL, sizeof(struct ppb_softc)
     71 };
     72 
     73 static int	ppbprint __P((void *, char *pnp));
     74 
     75 int
     76 ppbmatch(parent, match, aux)
     77 	struct device *parent;
     78 	void *match, *aux;
     79 {
     80 	struct cfdata *cf = match;
     81 	struct pci_attach_args *pa = aux;
     82 
     83 	/*
     84 	 * Check the ID register to see that it's a PCI bridge.
     85 	 * If it is, we assume that we can deal with it; it _should_
     86 	 * work in a standardized way...
     87 	 */
     88 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     89 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     90 		return (1);
     91 
     92 	return (0);
     93 }
     94 
     95 void
     96 ppbattach(parent, self, aux)
     97 	struct device *parent, *self;
     98 	void *aux;
     99 {
    100 	struct ppb_softc *sc = (struct ppb_softc *)self;
    101 	struct pci_attach_args *pa = aux;
    102 	struct pcibus_attach_args pba;
    103 	pcireg_t data;
    104 	char devinfo[256];
    105 
    106 	sc->sc_p_tag = pa->pa_tag;
    107 
    108 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
    109 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
    110 
    111 	data = pci_conf_read(sc->sc_p_tag, PPB_REG_BUSINFO);
    112 
    113 	sc->sc_s_num = PPB_BUSINFO_SECONDARY(data);
    114 	if (sc->sc_s_num == 0) {
    115 		printf("%s: not configured by system firmware\n",
    116 		    self->dv_xname);
    117 		return;
    118 	}
    119 
    120 #if 0
    121 	/*
    122 	 * XXX can't do this, because we're not given our bus number
    123 	 * (we shouldn't need it) and we can't decompose our tag.
    124 	 */
    125 
    126 	/* sanity check. */
    127 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(data))
    128 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    129 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(data));
    130 #endif
    131 
    132 	/*
    133 	 * Attach the PCI bus than hangs off of it.
    134 	 */
    135 	pba.pba_busname = "pci";
    136 	pba.pba_bus = sc->sc_s_num;
    137 	pba.pba_maxndevs = PPB_SECONDARY_DEVICES;
    138 
    139 	config_found(self, &pa, ppbprint);
    140 }
    141 
    142 static int
    143 ppbprint(aux, pnp)
    144 	void *aux;
    145 	char *pnp;
    146 {
    147 	struct pcibus_attach_args *pba = aux;
    148 
    149 	/* only PCIs can attach to PPBs; easy. */
    150 	if (pnp)
    151 		printf("pci at %s", pnp);
    152 	printf(" bus %d", pba->pba_bus);
    153         return (UNCONF);
    154 }
    155