1 /* $NetBSD: pcib.c,v 1.21 2021/08/07 16:19:08 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: pcib.c,v 1.21 2021/08/07 16:19:08 thorpej Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 40 #include <sys/bus.h> 41 42 #include <dev/isa/isavar.h> 43 44 #include <dev/pci/pcivar.h> 45 #include <dev/pci/pcireg.h> 46 47 #include <dev/pci/pcidevs.h> 48 49 #include "isa.h" 50 #include "pcibvar.h" 51 52 int pcibmatch(device_t, cfdata_t, void *); 53 54 CFATTACH_DECL3_NEW(pcib, sizeof(struct pcib_softc), 55 pcibmatch, pcibattach, pcibdetach, NULL, pcibrescan, pcibchilddet, 56 DVF_DETACH_SHUTDOWN); 57 58 void pcib_callback(device_t); 59 60 int 61 pcibmatch(device_t parent, cfdata_t match, void *aux) 62 { 63 struct pci_attach_args *pa = aux; 64 65 #if 0 66 /* 67 * PCI-ISA bridges are matched on class/subclass. 68 * This list contains only the bridges where correct 69 * (or incorrect) behaviour is not yet confirmed. 70 */ 71 switch (PCI_VENDOR(pa->pa_id)) { 72 case PCI_VENDOR_INTEL: 73 switch (PCI_PRODUCT(pa->pa_id)) { 74 case PCI_PRODUCT_INTEL_82426EX: 75 case PCI_PRODUCT_INTEL_82380AB: 76 return (1); 77 } 78 break; 79 80 case PCI_VENDOR_UMC: 81 switch (PCI_PRODUCT(pa->pa_id)) { 82 case PCI_PRODUCT_UMC_UM8886F: 83 case PCI_PRODUCT_UMC_UM82C886: 84 return (1); 85 } 86 break; 87 case PCI_VENDOR_ALI: 88 switch (PCI_PRODUCT(pa->pa_id)) { 89 case PCI_PRODUCT_ALI_M1449: 90 case PCI_PRODUCT_ALI_M1543: 91 return (1); 92 } 93 break; 94 case PCI_VENDOR_COMPAQ: 95 switch (PCI_PRODUCT(pa->pa_id)) { 96 case PCI_PRODUCT_COMPAQ_PCI_ISA_BRIDGE: 97 return (1); 98 } 99 break; 100 case PCI_VENDOR_VIATECH: 101 switch (PCI_PRODUCT(pa->pa_id)) { 102 case PCI_PRODUCT_VIATECH_VT82C570MV: 103 case PCI_PRODUCT_VIATECH_VT82C586_ISA: 104 return (1); 105 } 106 break; 107 } 108 #endif 109 110 /* 111 * some special cases: 112 */ 113 switch (PCI_VENDOR(pa->pa_id)) { 114 case PCI_VENDOR_INTEL: 115 switch (PCI_PRODUCT(pa->pa_id)) { 116 case PCI_PRODUCT_INTEL_SIO: 117 /* 118 * The Intel SIO identifies itself as a 119 * miscellaneous prehistoric. 120 */ 121 case PCI_PRODUCT_INTEL_82371MX: 122 /* 123 * The Intel 82371MX identifies itself erroneously as a 124 * miscellaneous bridge. 125 */ 126 case PCI_PRODUCT_INTEL_82371AB_ISA: 127 /* 128 * Some Intel 82371AB PCI-ISA bridge identifies 129 * itself as miscellaneous bridge. 130 */ 131 return (1); 132 } 133 break; 134 case PCI_VENDOR_SIS: 135 switch (PCI_PRODUCT(pa->pa_id)) { 136 case PCI_PRODUCT_SIS_85C503: 137 /* 138 * The SIS 85C503 identifies itself as a 139 * miscellaneous prehistoric. 140 */ 141 return (1); 142 } 143 break; 144 case PCI_VENDOR_VIATECH: 145 switch (PCI_PRODUCT(pa->pa_id)) { 146 case PCI_PRODUCT_VIATECH_VT82C686A_PWR: 147 /* 148 * The VIA VT82C686A Power Management Controller 149 * identifies itself as ISA bridge, but it's wrong ! 150 */ 151 return (0); 152 } 153 break; 154 /* 155 * The Cyrix cs5530 PCI host bridge does not have a broken 156 * latch on the i8254 clock core, unlike its predecessors 157 * the cs5510 and cs5520. This reverses the setting from 158 * i386/i386/identcpu.c where it arguably should not have 159 * been set in the first place. XXX 160 */ 161 case PCI_VENDOR_CYRIX: 162 switch (PCI_PRODUCT(pa->pa_id)) { 163 case PCI_PRODUCT_CYRIX_CX5530_PCIB: 164 #if !defined(XENPV) 165 { 166 extern int clock_broken_latch; 167 168 clock_broken_latch = 0; 169 } 170 #endif 171 return (1); 172 } 173 break; 174 } 175 176 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE && 177 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA) { 178 return (1); 179 } 180 181 return (0); 182 } 183 184 void 185 pcibattach(device_t parent, device_t self, void *aux) 186 { 187 struct pcib_softc *sc = device_private(self); 188 struct pci_attach_args *pa = aux; 189 190 /* 191 * Just print out a description and defer configuration 192 * until all PCI devices have been attached. 193 */ 194 pci_aprint_devinfo(pa, NULL); 195 196 sc->sc_pc = pa->pa_pc; 197 sc->sc_tag = pa->pa_tag; 198 199 if (!pmf_device_register(self, NULL, NULL)) 200 aprint_error_dev(self, "couldn't establish power handler\n"); 201 202 config_defer(self, pcib_callback); 203 } 204 205 int 206 pcibdetach(device_t self, int flags) 207 { 208 int rc; 209 210 if ((rc = config_detach_children(self, flags)) != 0) 211 return rc; 212 pmf_device_deregister(self); 213 return 0; 214 } 215 216 void 217 pcibchilddet(device_t self, device_t child) 218 { 219 struct pcib_softc *sc = device_private(self); 220 221 if (sc->sc_isabus == child) 222 sc->sc_isabus = NULL; 223 } 224 225 int 226 pcibrescan(device_t self, const char *ifattr, const int *loc) 227 { 228 struct pcib_softc *sc = device_private(self); 229 struct isabus_attach_args iba; 230 231 /* 232 * Even though pcib only has a single "isabus" interface 233 * attribute, this function is referenced by other drivers 234 * that carry more, so we go ahead and filter. 235 */ 236 if (ifattr_match(ifattr, "isabus") && sc->sc_isabus == NULL) { 237 /* 238 * Attach the ISA bus behind this bridge. 239 */ 240 memset(&iba, 0, sizeof(iba)); 241 iba.iba_iot = x86_bus_space_io; 242 iba.iba_memt = x86_bus_space_mem; 243 #if NISA > 0 244 iba.iba_dmat = &isa_bus_dma_tag; 245 #endif 246 sc->sc_isabus = 247 config_found(self, &iba, isabusprint, 248 CFARGS(.iattr = "isabus")); 249 } 250 return 0; 251 } 252 253 void 254 pcib_callback(device_t self) 255 { 256 pcibrescan(self, "isabus", NULL); 257 } 258
Indexes created Sat Sep 20 22:09:52 GMT 2025