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ppb.c revision 1.26 
      1 /*	$NetBSD: ppb.c,v 1.26 2003/06/15 23:09:09 fvdl 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/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: ppb.c,v 1.26 2003/06/15 23:09:09 fvdl Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/kernel.h>
     39 #include <sys/device.h>
     40 
     41 #include <dev/pci/pcireg.h>
     42 #include <dev/pci/pcivar.h>
     43 #include <dev/pci/ppbreg.h>
     44 
     45 struct ppb_softc {
     46 	struct device sc_dev;		/* generic device glue */
     47 	pci_chipset_tag_t sc_pc;	/* our PCI chipset... */
     48 	pcitag_t sc_tag;		/* ...and tag. */
     49 };
     50 
     51 int	ppbmatch __P((struct device *, struct cfdata *, void *));
     52 void	ppbattach __P((struct device *, struct device *, void *));
     53 
     54 CFATTACH_DECL(ppb, sizeof(struct ppb_softc),
     55     ppbmatch, ppbattach, NULL, NULL);
     56 
     57 int	ppbprint __P((void *, const char *pnp));
     58 
     59 int
     60 ppbmatch(parent, match, aux)
     61 	struct device *parent;
     62 	struct cfdata *match;
     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 ppb_softc *sc = (void *) self;
     85 	struct pci_attach_args *pa = aux;
     86 	pci_chipset_tag_t pc = pa->pa_pc;
     87 	struct pcibus_attach_args pba;
     88 	pcireg_t busdata;
     89 	char devinfo[256];
     90 
     91 	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo);
     92 	printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class));
     93 
     94 	sc->sc_pc = pc;
     95 	sc->sc_tag = pa->pa_tag;
     96 
     97 	busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO);
     98 
     99 	if (PPB_BUSINFO_SECONDARY(busdata) == 0) {
    100 		printf("%s: not configured by system firmware\n",
    101 		    self->dv_xname);
    102 		return;
    103 	}
    104 
    105 #if 0
    106 	/*
    107 	 * XXX can't do this, because we're not given our bus number
    108 	 * (we shouldn't need it), and because we've no way to
    109 	 * decompose our tag.
    110 	 */
    111 	/* sanity check. */
    112 	if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata))
    113 		panic("ppbattach: bus in tag (%d) != bus in reg (%d)",
    114 		    pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata));
    115 #endif
    116 
    117 	/*
    118 	 * Attach the PCI bus than hangs off of it.
    119 	 *
    120 	 * XXX Don't pass-through Memory Read Multiple.  Should we?
    121 	 * XXX Consult the spec...
    122 	 */
    123 	pba.pba_busname = "pci";	/* XXX should be pci_ppb attachment */
    124 	pba.pba_iot = pa->pa_iot;
    125 	pba.pba_memt = pa->pa_memt;
    126 	pba.pba_dmat = pa->pa_dmat;
    127 	pba.pba_dmat64 = pa->pa_dmat64;
    128 	pba.pba_pc = pc;
    129 	pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY;
    130 	pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata);
    131 	pba.pba_bridgetag = &sc->sc_tag;
    132 	pba.pba_intrswiz = pa->pa_intrswiz;
    133 	pba.pba_intrtag = pa->pa_intrtag;
    134 
    135 	config_found(self, &pba, ppbprint);
    136 }
    137 
    138 int
    139 ppbprint(aux, pnp)
    140 	void *aux;
    141 	const char *pnp;
    142 {
    143 	struct pcibus_attach_args *pba = aux;
    144 
    145 	/* only PCIs can attach to PPBs; easy. */
    146 	if (pnp)
    147 		aprint_normal("pci at %s", pnp);
    148 	aprint_normal(" bus %d", pba->pba_bus);
    149 	return (UNCONF);
    150 }
    151