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ppb.c revision 1.16 
      1 /*	$NetBSD: ppb.c,v 1.16 1998/01/12 09:40:12 thorpej 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 #ifdef __BROKEN_INDIRECT_CONFIG
     53 int	ppbmatch __P((struct device *, void *, void *));
     54 #else
     55 int	ppbmatch __P((struct device *, struct cfdata *, void *));
     56 #endif
     57 void	ppbattach __P((struct device *, struct device *, void *));
     58 
     59 struct cfattach ppb_ca = {
     60 	sizeof(struct device), ppbmatch, ppbattach
     61 };
     62 
     63 int	ppbprint __P((void *, const char *pnp));
     64 
     65 int
     66 ppbmatch(parent, match, aux)
     67 	struct device *parent;
     68 #ifdef __BROKEN_INDIRECT_CONFIG
     69 	void *match;
     70 #else
     71 	struct cfdata *match;
     72 #endif
     73 	void *aux;
     74 {
     75 	struct pci_attach_args *pa = aux;
     76 
     77 	/*
     78 	 * Check the ID register to see that it's a PCI bridge.
     79 	 * If it is, we assume that we can deal with it; it _should_
     80 	 * work in a standardized way...
     81 	 */
     82 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     83 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     84 		return (1);
     85 
     86 	return (0);
     87 }
     88 
     89 void
     90 ppbattach(parent, self, aux)
     91 	struct device *parent, *self;
     92 	void *aux;
     93 {
     94 	struct pci_attach_args *pa = aux;
     95 	pci_chipset_tag_t pc = pa->pa_pc;
     96 	struct pcibus_attach_args pba;
     97 	pcireg_t busdata;
     98 	char devinfo[256];
     99 
    100 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
    101 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
    102 
    103 	busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
    104 
    105 	if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
    106 		printf("%s: not configured by system firmware\n",
    107 		    self->dv_xname);
    108 		return;
    109 	}
    110 
    111 #if 0
    112 	/*
    113 	 * XXX can't do this, because we're not given our bus number
    114 	 * (we shouldn't need it), and because we've no way to
    115 	 * decompose our tag.
    116 	 */
    117 	/* sanity check. */
    118 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
    119 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    120 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
    121 #endif
    122 
    123 	/*
    124 	 * Attach the PCI bus than hangs off of it.
    125 	 */
    126 	pba.pba_busname = "pci";
    127 	pba.pba_iot = pa->pa_iot;
    128 	pba.pba_memt = pa->pa_memt;
    129 	pba.pba_dmat = pa->pa_dmat;
    130 	pba.pba_pc = pc;
    131 	pba.pba_flags = pa->pa_flags;
    132 	pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
    133 	pba.pba_intrswiz = pa->pa_intrswiz;
    134 	pba.pba_intrtag = pa->pa_intrtag;
    135 
    136 	config_found(self, &pba, ppbprint);
    137 }
    138 
    139 int
    140 ppbprint(aux, pnp)
    141 	void *aux;
    142 	const char *pnp;
    143 {
    144 	struct pcibus_attach_args *pba = aux;
    145 
    146 	/* only PCIs can attach to PPBs; easy. */
    147 	if (pnp)
    148 		printf("pci at %s", pnp);
    149 	printf(" bus %d", pba->pba_bus);
    150 	return (UNCONF);
    151 }
    152