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ppb.c revision 1.17 
      1 /*	$NetBSD: ppb.c,v 1.17 1998/03/04 06:31:46 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996, 1998 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 #include <sys/param.h>
     34 #include <sys/systm.h>
     35 #include <sys/kernel.h>
     36 #include <sys/device.h>
     37 
     38 #include <dev/pci/pcireg.h>
     39 #include <dev/pci/pcivar.h>
     40 #include <dev/pci/ppbreg.h>
     41 
     42 #ifdef __BROKEN_INDIRECT_CONFIG
     43 int	ppbmatch __P((struct device *, void *, void *));
     44 #else
     45 int	ppbmatch __P((struct device *, struct cfdata *, void *));
     46 #endif
     47 void	ppbattach __P((struct device *, struct device *, void *));
     48 
     49 struct cfattach ppb_ca = {
     50 	sizeof(struct device), ppbmatch, ppbattach
     51 };
     52 
     53 int	ppbprint __P((void *, const char *pnp));
     54 
     55 int
     56 ppbmatch(parent, match, aux)
     57 	struct device *parent;
     58 #ifdef __BROKEN_INDIRECT_CONFIG
     59 	void *match;
     60 #else
     61 	struct cfdata *match;
     62 #endif
     63 	void *aux;
     64 {
     65 	struct pci_attach_args *pa = aux;
     66 
     67 	/*
     68 	 * Check the ID register to see that it's a PCI bridge.
     69 	 * If it is, we assume that we can deal with it; it _should_
     70 	 * work in a standardized way...
     71 	 */
     72 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     73 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     74 		return (1);
     75 
     76 	return (0);
     77 }
     78 
     79 void
     80 ppbattach(parent, self, aux)
     81 	struct device *parent, *self;
     82 	void *aux;
     83 {
     84 	struct pci_attach_args *pa = aux;
     85 	pci_chipset_tag_t pc = pa->pa_pc;
     86 	struct pcibus_attach_args pba;
     87 	pcireg_t busdata;
     88 	char devinfo[256];
     89 
     90 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
     91 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
     92 
     93 	busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
     94 
     95 	if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
     96 		printf("%s: not configured by system firmware\n",
     97 		    self->dv_xname);
     98 		return;
     99 	}
    100 
    101 #if 0
    102 	/*
    103 	 * XXX can't do this, because we're not given our bus number
    104 	 * (we shouldn't need it), and because we've no way to
    105 	 * decompose our tag.
    106 	 */
    107 	/* sanity check. */
    108 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
    109 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    110 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
    111 #endif
    112 
    113 	/*
    114 	 * Attach the PCI bus than hangs off of it.
    115 	 */
    116 	pba.pba_busname = "pci";	/* XXX should be pci_ppb attachment */
    117 	pba.pba_iot = pa->pa_iot;
    118 	pba.pba_memt = pa->pa_memt;
    119 	pba.pba_dmat = pa->pa_dmat;
    120 	pba.pba_pc = pc;
    121 	pba.pba_flags = pa->pa_flags;
    122 	pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
    123 	pba.pba_intrswiz = pa->pa_intrswiz;
    124 	pba.pba_intrtag = pa->pa_intrtag;
    125 
    126 	config_found(self, &pba, ppbprint);
    127 }
    128 
    129 int
    130 ppbprint(aux, pnp)
    131 	void *aux;
    132 	const char *pnp;
    133 {
    134 	struct pcibus_attach_args *pba = aux;
    135 
    136 	/* only PCIs can attach to PPBs; easy. */
    137 	if (pnp)
    138 		printf("pci at %s", pnp);
    139 	printf(" bus %d", pba->pba_bus);
    140 	return (UNCONF);
    141 }
    142