1 /* $NetBSD: pci_bus_fixup.c,v 1.1 2008/05/18 02:06:14 jmcneill Exp $ */ 2 3 /* 4 * Copyright (c) 1999, by UCHIYAMA Yasushi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. The name of the developer may NOT be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * PCI bus renumbering support. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: pci_bus_fixup.c,v 1.1 2008/05/18 02:06:14 jmcneill Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 39 #include <machine/bus.h> 40 41 #include <dev/pci/pcireg.h> 42 #include <dev/pci/pcivar.h> 43 #include <dev/pci/pcidevs.h> 44 #include <dev/pci/ppbreg.h> 45 46 #include <x86/pci/pci_bus_fixup.h> 47 48 /* this array lists the parent for each bus number */ 49 int pci_bus_parent[256]; 50 51 /* this array lists the pcitag to program each bridge */ 52 pcitag_t pci_bus_tag[256]; 53 54 static void pci_bridge_reset(pci_chipset_tag_t, pcitag_t, void *); 55 56 int 57 pci_bus_fixup(pci_chipset_tag_t pc, int bus) 58 { 59 static int bus_total; 60 static int bridge_cnt; 61 int device, maxdevs, function, nfuncs, bridge, bus_max, bus_sub; 62 const struct pci_quirkdata *qd; 63 pcireg_t reg; 64 pcitag_t tag; 65 66 bus_max = bus; 67 bus_sub = 0; 68 69 if (++bus_total > 256) 70 panic("pci_bus_fixup: more than 256 PCI busses?"); 71 72 /* Reset bridge configuration on this bus */ 73 pci_bridge_foreach(pc, bus, bus, pci_bridge_reset, 0); 74 75 maxdevs = pci_bus_maxdevs(pc, bus); 76 77 for (device = 0; device < maxdevs; device++) { 78 tag = pci_make_tag(pc, bus, device, 0); 79 reg = pci_conf_read(pc, tag, PCI_ID_REG); 80 81 /* Invalid vendor ID value? */ 82 if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID) 83 continue; 84 /* XXX Not invalid, but we've done this ~forever. */ 85 if (PCI_VENDOR(reg) == 0) 86 continue; 87 88 qd = pci_lookup_quirkdata(PCI_VENDOR(reg), PCI_PRODUCT(reg)); 89 90 reg = pci_conf_read(pc, tag, PCI_BHLC_REG); 91 if (PCI_HDRTYPE_MULTIFN(reg) || 92 (qd != NULL && 93 (qd->quirks & PCI_QUIRK_MULTIFUNCTION) != 0)) 94 nfuncs = 8; 95 else 96 nfuncs = 1; 97 98 for (function = 0; function < nfuncs; function++) { 99 tag = pci_make_tag(pc, bus, device, function); 100 reg = pci_conf_read(pc, tag, PCI_ID_REG); 101 102 /* Invalid vendor ID value? */ 103 if (PCI_VENDOR(reg) == PCI_VENDOR_INVALID) 104 continue; 105 /* XXX Not invalid, but we've done this ~forever. */ 106 if (PCI_VENDOR(reg) == 0) 107 continue; 108 109 aprint_debug("PCI fixup examining %02x:%02x\n", 110 PCI_VENDOR(reg), PCI_PRODUCT(reg)); 111 112 reg = pci_conf_read(pc, tag, PCI_CLASS_REG); 113 if (PCI_CLASS(reg) == PCI_CLASS_BRIDGE && 114 (PCI_SUBCLASS(reg) == PCI_SUBCLASS_BRIDGE_PCI || 115 PCI_SUBCLASS(reg) == PCI_SUBCLASS_BRIDGE_CARDBUS)) { 116 /* Assign the bridge #. */ 117 bridge = bridge_cnt++; 118 119 /* Assign the bridge's secondary bus #. */ 120 bus_max++; 121 122 reg = pci_conf_read(pc, tag, PPB_REG_BUSINFO); 123 reg &= 0xff000000; 124 reg |= bus | (bus_max << 8) | (0xff << 16); 125 pci_conf_write(pc, tag, PPB_REG_BUSINFO, reg); 126 127 /* Scan subordinate bus. */ 128 bus_sub = pci_bus_fixup(pc, bus_max); 129 130 /* Configure the bridge. */ 131 reg &= 0xff000000; 132 reg |= bus | (bus_max << 8) | (bus_sub << 16); 133 pci_conf_write(pc, tag, PPB_REG_BUSINFO, reg); 134 135 /* record relationship */ 136 pci_bus_parent[bus_max]=bus; 137 138 pci_bus_tag[bus_max]=tag; 139 140 aprint_debug("PCI bridge %d: primary %d, " 141 "secondary %d, subordinate %d\n", 142 bridge, bus, bus_max, bus_sub); 143 144 /* Next bridge's secondary bus #. */ 145 bus_max = (bus_sub > bus_max) ? 146 bus_sub : bus_max; 147 } 148 } 149 } 150 151 return (bus_max); /* last # of subordinate bus */ 152 } 153 154 /* Reset bus-bridge configuration */ 155 void 156 pci_bridge_reset(pci_chipset_tag_t pc, pcitag_t tag, void *ctx) 157 { 158 pcireg_t reg; 159 160 reg = pci_conf_read(pc, tag, PPB_REG_BUSINFO); 161 reg &= 0xff000000; 162 reg |= 0x00ffffff; /* max bus # */ 163 pci_conf_write(pc, tag, PPB_REG_BUSINFO, reg); 164 } 165