1 /* $NetBSD: ppb.c,v 1.24 2002/10/02 16:51:54 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 1.24 2002/10/02 16:51:54 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 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_pc = pc; 128 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 129 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 130 pba.pba_bridgetag = &sc->sc_tag; 131 pba.pba_intrswiz = pa->pa_intrswiz; 132 pba.pba_intrtag = pa->pa_intrtag; 133 134 config_found(self, &pba, ppbprint); 135 } 136 137 int 138 ppbprint(aux, pnp) 139 void *aux; 140 const char *pnp; 141 { 142 struct pcibus_attach_args *pba = aux; 143 144 /* only PCIs can attach to PPBs; easy. */ 145 if (pnp) 146 printf("pci at %s", pnp); 147 printf(" bus %d", pba->pba_bus); 148 return (UNCONF); 149 } 150