1 /* $NetBSD: ppb.c,v 1.20 2001/11/13 07:48:48 lukem 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 1.20 2001/11/13 07:48:48 lukem 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 int ppbmatch __P((struct device *, struct cfdata *, void *)); 46 void ppbattach __P((struct device *, struct device *, void *)); 47 48 struct cfattach ppb_ca = { 49 sizeof(struct device), ppbmatch, ppbattach 50 }; 51 52 int ppbprint __P((void *, const char *pnp)); 53 54 int 55 ppbmatch(parent, match, aux) 56 struct device *parent; 57 struct cfdata *match; 58 void *aux; 59 { 60 struct pci_attach_args *pa = aux; 61 62 /* 63 * Check the ID register to see that it's a PCI bridge. 64 * If it is, we assume that we can deal with it; it _should_ 65 * work in a standardized way... 66 */ 67 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 68 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 69 return (1); 70 71 return (0); 72 } 73 74 void 75 ppbattach(parent, self, aux) 76 struct device *parent, *self; 77 void *aux; 78 { 79 struct pci_attach_args *pa = aux; 80 pci_chipset_tag_t pc = pa->pa_pc; 81 struct pcibus_attach_args pba; 82 pcireg_t busdata; 83 char devinfo[256]; 84 85 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo); 86 printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class)); 87 88 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 89 90 if (PPB_BUSINFO_SECONDARY(busdata) == 0) { 91 printf("%s: not configured by system firmware\n", 92 self->dv_xname); 93 return; 94 } 95 96 #if 0 97 /* 98 * XXX can't do this, because we're not given our bus number 99 * (we shouldn't need it), and because we've no way to 100 * decompose our tag. 101 */ 102 /* sanity check. */ 103 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 104 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 105 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 106 #endif 107 108 /* 109 * Attach the PCI bus than hangs off of it. 110 * 111 * XXX Don't pass-through Memory Read Multiple. Should we? 112 * XXX Consult the spec... 113 */ 114 pba.pba_busname = "pci"; /* XXX should be pci_ppb attachment */ 115 pba.pba_iot = pa->pa_iot; 116 pba.pba_memt = pa->pa_memt; 117 pba.pba_dmat = pa->pa_dmat; 118 pba.pba_pc = pc; 119 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 120 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 121 pba.pba_intrswiz = pa->pa_intrswiz; 122 pba.pba_intrtag = pa->pa_intrtag; 123 124 config_found(self, &pba, ppbprint); 125 } 126 127 int 128 ppbprint(aux, pnp) 129 void *aux; 130 const char *pnp; 131 { 132 struct pcibus_attach_args *pba = aux; 133 134 /* only PCIs can attach to PPBs; easy. */ 135 if (pnp) 136 printf("pci at %s", pnp); 137 printf(" bus %d", pba->pba_bus); 138 return (UNCONF); 139 } 140