Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/isa_pci.c
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier 5 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org> 6 * Copyright (c) 2000 BSDi 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * PCI:ISA bridge support 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/bus.h> 45 46 #include <isa/isavar.h> 47 #include <dev/pci/pcivar.h> 48 #include <dev/pci/pcireg.h> 49 50 #include <machine/bus.h> 51 #include <sys/rman.h> 52 #include <machine/resource.h> 53 54 static int isab_pci_probe(device_t dev); 55 static int isab_pci_attach(device_t dev); 56 static struct resource * isab_pci_alloc_resource(device_t dev, 57 device_t child, int type, int *rid, rman_res_t start, rman_res_t end, 58 rman_res_t count, u_int flags); 59 static int isab_pci_release_resource(device_t dev, device_t child, 60 int type, int rid, struct resource *r); 61 62 static device_method_t isab_methods[] = { 63 /* Device interface */ 64 DEVMETHOD(device_probe, isab_pci_probe), 65 DEVMETHOD(device_attach, isab_pci_attach), 66 DEVMETHOD(device_detach, bus_generic_detach), 67 DEVMETHOD(device_shutdown, bus_generic_shutdown), 68 DEVMETHOD(device_suspend, bus_generic_suspend), 69 DEVMETHOD(device_resume, bus_generic_resume), 70 71 /* Bus interface */ 72 DEVMETHOD(bus_add_child, bus_generic_add_child), 73 DEVMETHOD(bus_alloc_resource, isab_pci_alloc_resource), 74 DEVMETHOD(bus_release_resource, isab_pci_release_resource), 75 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 76 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 77 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 78 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 79 80 DEVMETHOD_END 81 }; 82 83 struct isab_pci_resource { 84 struct resource *ip_res; 85 int ip_refs; 86 }; 87 88 struct isab_pci_softc { 89 struct isab_pci_resource isab_pci_res[PCIR_MAX_BAR_0 + 1]; 90 }; 91 92 static driver_t isab_driver = { 93 "isab", 94 isab_methods, 95 sizeof(struct isab_pci_softc), 96 }; 97 98 DRIVER_MODULE(isab, pci, isab_driver, 0, 0); 99 100 /* 101 * XXX we need to add a quirk list here for bridges that don't correctly 102 * report themselves. 103 */ 104 static int 105 isab_pci_probe(device_t dev) 106 { 107 int matched = 0; 108 109 /* 110 * Try for a generic match based on class/subclass. 111 */ 112 if ((pci_get_class(dev) == PCIC_BRIDGE) && 113 (pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) { 114 matched = 1; 115 } else { 116 /* 117 * These are devices that we *know* are PCI:ISA bridges. 118 * Sometimes, however, they don't report themselves as 119 * such. Check in case one of them is pretending to be 120 * something else. 121 */ 122 switch (pci_get_devid(dev)) { 123 case 0x04848086: /* Intel 82378ZB/82378IB */ 124 case 0x122e8086: /* Intel 82371FB */ 125 case 0x70008086: /* Intel 82371SB */ 126 case 0x71108086: /* Intel 82371AB */ 127 case 0x71988086: /* Intel 82443MX */ 128 case 0x24108086: /* Intel 82801AA (ICH) */ 129 case 0x24208086: /* Intel 82801AB (ICH0) */ 130 case 0x24408086: /* Intel 82801AB (ICH2) */ 131 case 0x00061004: /* VLSI 82C593 */ 132 case 0x05861106: /* VIA 82C586 */ 133 case 0x05961106: /* VIA 82C596 */ 134 case 0x06861106: /* VIA 82C686 */ 135 case 0x153310b9: /* AcerLabs M1533 */ 136 case 0x154310b9: /* AcerLabs M1543 */ 137 case 0x00081039: /* SiS 85c503 */ 138 case 0x00001078: /* Cyrix Cx5510 */ 139 case 0x01001078: /* Cyrix Cx5530 */ 140 case 0xc7001045: /* OPTi 82C700 (FireStar) */ 141 case 0x886a1060: /* UMC UM8886 ISA */ 142 case 0x02001166: /* ServerWorks IB6566 PCI */ 143 if (bootverbose) 144 printf("PCI-ISA bridge with incorrect subclass 0x%x\n", 145 pci_get_subclass(dev)); 146 matched = 1; 147 break; 148 149 default: 150 break; 151 } 152 } 153 154 if (matched) { 155 device_set_desc(dev, "PCI-ISA bridge"); 156 return(-10000); 157 } 158 return(ENXIO); 159 } 160 161 static int 162 isab_pci_attach(device_t dev) 163 { 164 165 bus_generic_probe(dev); 166 return (isab_attach(dev)); 167 } 168 169 static struct resource * 170 isab_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 171 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 172 { 173 struct isab_pci_softc *sc; 174 int bar; 175 176 if (device_get_parent(child) != dev) 177 return bus_generic_alloc_resource(dev, child, type, rid, start, 178 end, count, flags); 179 180 switch (type) { 181 case SYS_RES_MEMORY: 182 case SYS_RES_IOPORT: 183 /* 184 * For BARs, we cache the resource so that we only allocate it 185 * from the PCI bus once. 186 */ 187 bar = PCI_RID2BAR(*rid); 188 if (bar < 0 || bar > PCIR_MAX_BAR_0) 189 return (NULL); 190 sc = device_get_softc(dev); 191 if (sc->isab_pci_res[bar].ip_res == NULL) 192 sc->isab_pci_res[bar].ip_res = bus_alloc_resource(dev, type, 193 rid, start, end, count, flags); 194 if (sc->isab_pci_res[bar].ip_res != NULL) 195 sc->isab_pci_res[bar].ip_refs++; 196 return (sc->isab_pci_res[bar].ip_res); 197 } 198 199 return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid, 200 start, end, count, flags)); 201 } 202 203 static int 204 isab_pci_release_resource(device_t dev, device_t child, int type, int rid, 205 struct resource *r) 206 { 207 struct isab_pci_softc *sc; 208 int bar, error; 209 210 if (device_get_parent(child) != dev) 211 return bus_generic_release_resource(dev, child, type, rid, r); 212 213 switch (type) { 214 case SYS_RES_MEMORY: 215 case SYS_RES_IOPORT: 216 /* 217 * For BARs, we release the resource from the PCI bus 218 * when the last child reference goes away. 219 */ 220 bar = PCI_RID2BAR(rid); 221 if (bar < 0 || bar > PCIR_MAX_BAR_0) 222 return (EINVAL); 223 sc = device_get_softc(dev); 224 if (sc->isab_pci_res[bar].ip_res == NULL) 225 return (EINVAL); 226 KASSERT(sc->isab_pci_res[bar].ip_res == r, 227 ("isa_pci resource mismatch")); 228 if (sc->isab_pci_res[bar].ip_refs > 1) { 229 sc->isab_pci_res[bar].ip_refs--; 230 return (0); 231 } 232 KASSERT(sc->isab_pci_res[bar].ip_refs > 0, 233 ("isa_pci resource reference count underflow")); 234 error = bus_release_resource(dev, type, rid, r); 235 if (error == 0) { 236 sc->isab_pci_res[bar].ip_res = NULL; 237 sc->isab_pci_res[bar].ip_refs = 0; 238 } 239 return (error); 240 } 241 242 return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type, 243 rid, r)); 244 }
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