Home | History | Annotate | Line # | Download | only in pci
ppb.c revision 1.19 
      1 /*	$NetBSD: ppb.c,v 1.19 1999/11/04 19:04:04 thorpej 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 int	ppbmatch __P((struct device *, struct cfdata *, void *));
     43 void	ppbattach __P((struct device *, struct device *, void *));
     44 
     45 struct cfattach ppb_ca = {
     46 	sizeof(struct device), ppbmatch, ppbattach
     47 };
     48 
     49 int	ppbprint __P((void *, const char *pnp));
     50 
     51 int
     52 ppbmatch(parent, match, aux)
     53 	struct device *parent;
     54 	struct cfdata *match;
     55 	void *aux;
     56 {
     57 	struct pci_attach_args *pa = aux;
     58 
     59 	/*
     60 	 * Check the ID register to see that it's a PCI bridge.
     61 	 * If it is, we assume that we can deal with it; it _should_
     62 	 * work in a standardized way...
     63 	 */
     64 	if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
     65 	    PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI)
     66 		return (1);
     67 
     68 	return (0);
     69 }
     70 
     71 void
     72 ppbattach(parent, self, aux)
     73 	struct device *parent, *self;
     74 	void *aux;
     75 {
     76 	struct pci_attach_args *pa = aux;
     77 	pci_chipset_tag_t pc = pa->pa_pc;
     78 	struct pcibus_attach_args pba;
     79 	pcireg_t busdata;
     80 	char devinfo[256];
     81 
     82 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
     83 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
     84 
     85 	busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
     86 
     87 	if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
     88 		printf("%s: not configured by system firmware\n",
     89 		    self->dv_xname);
     90 		return;
     91 	}
     92 
     93 #if 0
     94 	/*
     95 	 * XXX can't do this, because we're not given our bus number
     96 	 * (we shouldn't need it), and because we've no way to
     97 	 * decompose our tag.
     98 	 */
     99 	/* sanity check. */
    100 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
    101 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    102 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
    103 #endif
    104 
    105 	/*
    106 	 * Attach the PCI bus than hangs off of it.
    107 	 *
    108 	 * XXX Don't pass-through Memory Read Multiple.  Should we?
    109 	 * XXX Consult the spec...
    110 	 */
    111 	pba.pba_busname = "pci";	/* XXX should be pci_ppb attachment */
    112 	pba.pba_iot = pa->pa_iot;
    113 	pba.pba_memt = pa->pa_memt;
    114 	pba.pba_dmat = pa->pa_dmat;
    115 	pba.pba_pc = pc;
    116 	pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
    117 	pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
    118 	pba.pba_intrswiz = pa->pa_intrswiz;
    119 	pba.pba_intrtag = pa->pa_intrtag;
    120 
    121 	config_found(self, &pba, ppbprint);
    122 }
    123 
    124 int
    125 ppbprint(aux, pnp)
    126 	void *aux;
    127 	const char *pnp;
    128 {
    129 	struct pcibus_attach_args *pba = aux;
    130 
    131 	/* only PCIs can attach to PPBs; easy. */
    132 	if (pnp)
    133 		printf("pci at %s", pnp);
    134 	printf(" bus %d", pba->pba_bus);
    135 	return (UNCONF);
    136 }
    137