1 /* $NetBSD: ppb.c,v 1.21 2002/05/16 01:01:30 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: ppb.c,v 1.21 2002/05/16 01:01:30 thorpej 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 struct cfattach ppb_ca = { 55 sizeof(struct ppb_softc), ppbmatch, ppbattach 56 }; 57 58 int ppbprint __P((void *, const char *pnp)); 59 60 int 61 ppbmatch(parent, match, aux) 62 struct device *parent; 63 struct cfdata *match; 64 void *aux; 65 { 66 struct pci_attach_args *pa = aux; 67 68 /* 69 * Check the ID register to see that it's a PCI bridge. 70 * If it is, we assume that we can deal with it; it _should_ 71 * work in a standardized way... 72 */ 73 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 74 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 75 return (1); 76 77 return (0); 78 } 79 80 void 81 ppbattach(parent, self, aux) 82 struct device *parent, *self; 83 void *aux; 84 { 85 struct ppb_softc *sc = (void *) self; 86 struct pci_attach_args *pa = aux; 87 pci_chipset_tag_t pc = pa->pa_pc; 88 struct pcibus_attach_args pba; 89 pcireg_t busdata; 90 char devinfo[256]; 91 92 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo); 93 printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class)); 94 95 sc->sc_pc = pc; 96 sc->sc_tag = pa->pa_tag; 97 98 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 99 100 if (PPB_BUSINFO_SECONDARY(busdata) == 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 because we've no way to 110 * decompose our tag. 111 */ 112 /* sanity check. */ 113 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 114 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 115 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 116 #endif 117 118 /* 119 * Attach the PCI bus than hangs off of it. 120 * 121 * XXX Don't pass-through Memory Read Multiple. Should we? 122 * XXX Consult the spec... 123 */ 124 pba.pba_busname = "pci"; /* XXX should be pci_ppb attachment */ 125 pba.pba_iot = pa->pa_iot; 126 pba.pba_memt = pa->pa_memt; 127 pba.pba_dmat = pa->pa_dmat; 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 printf("pci at %s", pnp); 148 printf(" bus %d", pba->pba_bus); 149 return (UNCONF); 150 } 151