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ppb.c revision 1.6 
      1 /*	$NetBSD: ppb.c,v 1.6 1996/03/17 01:47:52 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 int	ppbmatch __P((struct device *, void *, void *));
     53 void	ppbattach __P((struct device *, struct device *, void *));
     54 
     55 struct cfattach ppb_ca = {
     56 	sizeof(struct device), ppbmatch, ppbattach
     57 };
     58 
     59 struct cfdriver ppb_cd = {
     60 	NULL, "ppb", DV_DULL
     61 };
     62 
     63 static int	ppbprint __P((void *, char *pnp));
     64 
     65 int
     66 ppbmatch(parent, match, aux)
     67 	struct device *parent;
     68 	void *match, *aux;
     69 {
     70 	struct cfdata *cf = match;
     71 	struct pci_attach_args *pa = aux;
     72 
     73 	/*
     74 	 * Check the ID register to see that it's a PCI bridge.
     75 	 * If it is, we assume that we can deal with it; it _should_
     76 	 * work in a standardized way...
     77 	 */
     78 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     79 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     80 		return (1);
     81 
     82 	return (0);
     83 }
     84 
     85 void
     86 ppbattach(parent, self, aux)
     87 	struct device *parent, *self;
     88 	void *aux;
     89 {
     90 	struct pci_attach_args *pa = aux;
     91 	struct pcibus_attach_args pba;
     92 	pcireg_t data;
     93 	char devinfo[256];
     94 
     95 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
     96 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
     97 
     98 	data = pci_conf_read(pa->pa_tag, PPB_REG_BUSINFO);
     99 
    100 	if (PPB_BUSINFO_SECONDARY(data) == 0) {
    101 		printf("%s: not configured by system firmware\n",
    102 		    self->dv_xname);
    103 		return;
    104 	}
    105 
    106 #if 0
    107 	/*
    108 	 * XXX can't do this, because we're not given our bus number
    109 	 * (we shouldn't need it) and we can't decompose our tag.
    110 	 */
    111 
    112 	/* sanity check. */
    113 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(data))
    114 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    115 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(data));
    116 #endif
    117 
    118 	/*
    119 	 * Attach the PCI bus than hangs off of it.
    120 	 */
    121 	pba.pba_busname = "pci";
    122 	pba.pba_bus = PPB_BUSINFO_SECONDARY(data);
    123 
    124 	config_found(self, &pba, ppbprint);
    125 }
    126 
    127 static int
    128 ppbprint(aux, pnp)
    129 	void *aux;
    130 	char *pnp;
    131 {
    132 	struct pcibus_attach_args *pba = aux;
    133 
    134 	/* only PCIs can attach to PPBs; easy. */
    135 	if (pnp)
    136 		printf("pci at %s", pnp);
    137 	printf(" bus %d", pba->pba_bus);
    138 	return (UNCONF);
    139 }
    140