1 /* $NetBSD: ppb.c,v 1.12 1996/10/21 22:57:00 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 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 /* 34 * XXX NOTE: 35 * XXX PROPER OPERATION OF DEVICES BEHIND PPB'S WHICH USE INTERRUPTS 36 * XXX ON SYSTEMS OTHER THAN THE i386 IS NOT POSSIBLE AT THIS TIME. 37 * XXX There needs to be some support for 'swizzling' the interrupt 38 * XXX pin. In general, pci_map_int() has to have a different 39 * XXX interface. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/device.h> 46 47 #include <dev/pci/pcireg.h> 48 #include <dev/pci/pcivar.h> 49 #include <dev/pci/pcidevs.h> 50 #include <dev/pci/ppbreg.h> 51 52 int ppbmatch __P((struct device *, void *, void *)); 53 void ppbattach __P((struct device *, struct device *, void *)); 54 55 struct cfattach ppb_ca = { 56 sizeof(struct device), ppbmatch, ppbattach 57 }; 58 59 struct cfdriver ppb_cd = { 60 NULL, "ppb", DV_DULL 61 }; 62 63 int ppbprint __P((void *, const char *pnp)); 64 65 int 66 ppbmatch(parent, match, aux) 67 struct device *parent; 68 void *match, *aux; 69 { 70 struct pci_attach_args *pa = aux; 71 72 /* 73 * Check the ID register to see that it's a PCI bridge. 74 * If it is, we assume that we can deal with it; it _should_ 75 * work in a standardized way... 76 */ 77 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 78 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 79 return (1); 80 81 return (0); 82 } 83 84 void 85 ppbattach(parent, self, aux) 86 struct device *parent, *self; 87 void *aux; 88 { 89 struct pci_attach_args *pa = aux; 90 pci_chipset_tag_t pc = pa->pa_pc; 91 struct pcibus_attach_args pba; 92 pcireg_t busdata; 93 char devinfo[256]; 94 95 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo); 96 printf(": %s (rev. 0x%02x)\n", devinfo, PCI_REVISION(pa->pa_class)); 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 pba.pba_busname = "pci"; 122 pba.pba_iot = pa->pa_iot; 123 pba.pba_memt = pa->pa_memt; 124 pba.pba_pc = pc; 125 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 126 pba.pba_intrswiz = pa->pa_intrswiz; 127 pba.pba_intrtag = pa->pa_intrtag; 128 129 config_found(self, &pba, ppbprint); 130 } 131 132 int 133 ppbprint(aux, pnp) 134 void *aux; 135 const char *pnp; 136 { 137 struct pcibus_attach_args *pba = aux; 138 139 /* only PCIs can attach to PPBs; easy. */ 140 if (pnp) 141 printf("pci at %s", pnp); 142 printf(" bus %d", pba->pba_bus); 143 return (UNCONF); 144 } 145