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