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 /* 35 * PCI:ISA bridge support 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/bus.h> 43 44 #include <isa/isavar.h> 45 #include <dev/pci/pcivar.h> 46 #include <dev/pci/pcireg.h> 47 48 #include <machine/bus.h> 49 #include <sys/rman.h> 50 #include <machine/resource.h> 51 52 static int isab_pci_probe(device_t dev); 53 static int isab_pci_attach(device_t dev); 54 static struct resource * isab_pci_alloc_resource(device_t dev, 55 device_t child, int type, int *rid, rman_res_t start, rman_res_t end, 56 rman_res_t count, u_int flags); 57 static int isab_pci_release_resource(device_t dev, device_t child, 58 int type, int rid, struct resource *r); 59 60 static device_method_t isab_methods[] = { 61 /* Device interface */ 62 DEVMETHOD(device_probe, isab_pci_probe), 63 DEVMETHOD(device_attach, isab_pci_attach), 64 DEVMETHOD(device_detach, bus_generic_detach), 65 DEVMETHOD(device_shutdown, bus_generic_shutdown), 66 DEVMETHOD(device_suspend, bus_generic_suspend), 67 DEVMETHOD(device_resume, bus_generic_resume), 68 69 /* Bus interface */ 70 DEVMETHOD(bus_add_child, bus_generic_add_child), 71 DEVMETHOD(bus_alloc_resource, isab_pci_alloc_resource), 72 DEVMETHOD(bus_release_resource, isab_pci_release_resource), 73 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 74 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 75 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 76 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 77 78 DEVMETHOD_END 79 }; 80 81 struct isab_pci_resource { 82 struct resource *ip_res; 83 int ip_refs; 84 }; 85 86 struct isab_pci_softc { 87 struct isab_pci_resource isab_pci_res[PCIR_MAX_BAR_0 + 1]; 88 }; 89 90 static driver_t isab_driver = { 91 "isab", 92 isab_methods, 93 sizeof(struct isab_pci_softc), 94 }; 95 96 DRIVER_MODULE(isab, pci, isab_driver, 0, 0); 97 98 /* 99 * XXX we need to add a quirk list here for bridges that don't correctly 100 * report themselves. 101 */ 102 static int 103 isab_pci_probe(device_t dev) 104 { 105 int matched = 0; 106 107 /* 108 * Try for a generic match based on class/subclass. 109 */ 110 if ((pci_get_class(dev) == PCIC_BRIDGE) && 111 (pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) { 112 matched = 1; 113 } else { 114 /* 115 * These are devices that we *know* are PCI:ISA bridges. 116 * Sometimes, however, they don't report themselves as 117 * such. Check in case one of them is pretending to be 118 * something else. 119 */ 120 switch (pci_get_devid(dev)) { 121 case 0x04848086: /* Intel 82378ZB/82378IB */ 122 case 0x122e8086: /* Intel 82371FB */ 123 case 0x70008086: /* Intel 82371SB */ 124 case 0x71108086: /* Intel 82371AB */ 125 case 0x71988086: /* Intel 82443MX */ 126 case 0x24108086: /* Intel 82801AA (ICH) */ 127 case 0x24208086: /* Intel 82801AB (ICH0) */ 128 case 0x24408086: /* Intel 82801AB (ICH2) */ 129 case 0x00061004: /* VLSI 82C593 */ 130 case 0x05861106: /* VIA 82C586 */ 131 case 0x05961106: /* VIA 82C596 */ 132 case 0x06861106: /* VIA 82C686 */ 133 case 0x153310b9: /* AcerLabs M1533 */ 134 case 0x154310b9: /* AcerLabs M1543 */ 135 case 0x00081039: /* SiS 85c503 */ 136 case 0x00001078: /* Cyrix Cx5510 */ 137 case 0x01001078: /* Cyrix Cx5530 */ 138 case 0xc7001045: /* OPTi 82C700 (FireStar) */ 139 case 0x886a1060: /* UMC UM8886 ISA */ 140 case 0x02001166: /* ServerWorks IB6566 PCI */ 141 if (bootverbose) 142 printf("PCI-ISA bridge with incorrect subclass 0x%x\n", 143 pci_get_subclass(dev)); 144 matched = 1; 145 break; 146 147 default: 148 break; 149 } 150 } 151 152 if (matched) { 153 device_set_desc(dev, "PCI-ISA bridge"); 154 return(-10000); 155 } 156 return(ENXIO); 157 } 158 159 static int 160 isab_pci_attach(device_t dev) 161 { 162 163 bus_generic_probe(dev); 164 return (isab_attach(dev)); 165 } 166 167 static struct resource * 168 isab_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 169 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 170 { 171 struct isab_pci_softc *sc; 172 int bar; 173 174 if (device_get_parent(child) != dev) 175 return bus_generic_alloc_resource(dev, child, type, rid, start, 176 end, count, flags); 177 178 switch (type) { 179 case SYS_RES_MEMORY: 180 case SYS_RES_IOPORT: 181 /* 182 * For BARs, we cache the resource so that we only allocate it 183 * from the PCI bus once. 184 */ 185 bar = PCI_RID2BAR(*rid); 186 if (bar < 0 || bar > PCIR_MAX_BAR_0) 187 return (NULL); 188 sc = device_get_softc(dev); 189 if (sc->isab_pci_res[bar].ip_res == NULL) 190 sc->isab_pci_res[bar].ip_res = bus_alloc_resource(dev, type, 191 rid, start, end, count, flags); 192 if (sc->isab_pci_res[bar].ip_res != NULL) 193 sc->isab_pci_res[bar].ip_refs++; 194 return (sc->isab_pci_res[bar].ip_res); 195 } 196 197 return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid, 198 start, end, count, flags)); 199 } 200 201 static int 202 isab_pci_release_resource(device_t dev, device_t child, int type, int rid, 203 struct resource *r) 204 { 205 struct isab_pci_softc *sc; 206 int bar, error; 207 208 if (device_get_parent(child) != dev) 209 return bus_generic_release_resource(dev, child, type, rid, r); 210 211 switch (type) { 212 case SYS_RES_MEMORY: 213 case SYS_RES_IOPORT: 214 /* 215 * For BARs, we release the resource from the PCI bus 216 * when the last child reference goes away. 217 */ 218 bar = PCI_RID2BAR(rid); 219 if (bar < 0 || bar > PCIR_MAX_BAR_0) 220 return (EINVAL); 221 sc = device_get_softc(dev); 222 if (sc->isab_pci_res[bar].ip_res == NULL) 223 return (EINVAL); 224 KASSERT(sc->isab_pci_res[bar].ip_res == r, 225 ("isa_pci resource mismatch")); 226 if (sc->isab_pci_res[bar].ip_refs > 1) { 227 sc->isab_pci_res[bar].ip_refs--; 228 return (0); 229 } 230 KASSERT(sc->isab_pci_res[bar].ip_refs > 0, 231 ("isa_pci resource reference count underflow")); 232 error = bus_release_resource(dev, type, rid, r); 233 if (error == 0) { 234 sc->isab_pci_res[bar].ip_res = NULL; 235 sc->isab_pci_res[bar].ip_refs = 0; 236 } 237 return (error); 238 } 239 240 return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type, 241 rid, r)); 242 } 243