1 /* $NetBSD: ppb.c,v 1.32 2005/12/11 12:22:50 christos 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 1.32 2005/12/11 12:22:50 christos 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 static int 52 ppbmatch(struct device *parent, struct cfdata *match, void *aux) 53 { 54 struct pci_attach_args *pa = aux; 55 56 /* 57 * Check the ID register to see that it's a PCI bridge. 58 * If it is, we assume that we can deal with it; it _should_ 59 * work in a standardized way... 60 */ 61 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 62 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_PCI) 63 return (1); 64 65 return (0); 66 } 67 68 static void 69 ppbattach(struct device *parent, struct device *self, void *aux) 70 { 71 struct ppb_softc *sc = (void *) self; 72 struct pci_attach_args *pa = aux; 73 pci_chipset_tag_t pc = pa->pa_pc; 74 struct pcibus_attach_args pba; 75 pcireg_t busdata; 76 char devinfo[256]; 77 78 pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo)); 79 aprint_normal(": %s (rev. 0x%02x)\n", devinfo, 80 PCI_REVISION(pa->pa_class)); 81 aprint_naive("\n"); 82 83 sc->sc_pc = pc; 84 sc->sc_tag = pa->pa_tag; 85 86 busdata = pci_conf_read(pc, pa->pa_tag, PPB_REG_BUSINFO); 87 88 if (PPB_BUSINFO_SECONDARY(busdata) == 0) { 89 aprint_normal("%s: not configured by system firmware\n", 90 self->dv_xname); 91 return; 92 } 93 94 #if 0 95 /* 96 * XXX can't do this, because we're not given our bus number 97 * (we shouldn't need it), and because we've no way to 98 * decompose our tag. 99 */ 100 /* sanity check. */ 101 if (pa->pa_bus != PPB_BUSINFO_PRIMARY(busdata)) 102 panic("ppbattach: bus in tag (%d) != bus in reg (%d)", 103 pa->pa_bus, PPB_BUSINFO_PRIMARY(busdata)); 104 #endif 105 106 /* 107 * Attach the PCI bus than hangs off of it. 108 * 109 * XXX Don't pass-through Memory Read Multiple. Should we? 110 * XXX Consult the spec... 111 */ 112 pba.pba_iot = pa->pa_iot; 113 pba.pba_memt = pa->pa_memt; 114 pba.pba_dmat = pa->pa_dmat; 115 pba.pba_dmat64 = pa->pa_dmat64; 116 pba.pba_pc = pc; 117 pba.pba_flags = pa->pa_flags & ~PCI_FLAGS_MRM_OKAY; 118 pba.pba_bus = PPB_BUSINFO_SECONDARY(busdata); 119 pba.pba_bridgetag = &sc->sc_tag; 120 pba.pba_intrswiz = pa->pa_intrswiz; 121 pba.pba_intrtag = pa->pa_intrtag; 122 123 config_found_ia(self, "pcibus", &pba, pcibusprint); 124 } 125 126 CFATTACH_DECL(ppb, sizeof(struct ppb_softc), 127 ppbmatch, ppbattach, NULL, NULL); 128