2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
5 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
6 * Copyright (c) 2000 BSDi
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 * PCI:ISA bridge support
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
46 #include <isa/isavar.h>
47 #include <dev/pci/pcivar.h>
48 #include <dev/pci/pcireg.h>
50 #include <machine/bus.h>
52 #include <machine/resource.h>
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);
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),
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),
83 struct isab_pci_resource {
84 struct resource *ip_res;
88 struct isab_pci_softc {
89 struct isab_pci_resource isab_pci_res[PCIR_MAX_BAR_0 + 1];
92 static driver_t isab_driver = {
95 sizeof(struct isab_pci_softc),
98 DRIVER_MODULE(isab, pci, isab_driver, isab_devclass, 0, 0);
101 * XXX we need to add a quirk list here for bridges that don't correctly
105 isab_pci_probe(device_t dev)
110 * Try for a generic match based on class/subclass.
112 if ((pci_get_class(dev) == PCIC_BRIDGE) &&
113 (pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) {
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
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 */
144 printf("PCI-ISA bridge with incorrect subclass 0x%x\n",
145 pci_get_subclass(dev));
155 device_set_desc(dev, "PCI-ISA bridge");
162 isab_pci_attach(device_t dev)
165 bus_generic_probe(dev);
166 return (isab_attach(dev));
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)
173 struct isab_pci_softc *sc;
176 if (device_get_parent(child) != dev)
177 return bus_generic_alloc_resource(dev, child, type, rid, start,
184 * For BARs, we cache the resource so that we only allocate it
185 * from the PCI bus once.
187 bar = PCI_RID2BAR(*rid);
188 if (bar < 0 || bar > PCIR_MAX_BAR_0)
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);
199 return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid,
200 start, end, count, flags));
204 isab_pci_release_resource(device_t dev, device_t child, int type, int rid,
207 struct isab_pci_softc *sc;
210 if (device_get_parent(child) != dev)
211 return bus_generic_release_resource(dev, child, type, rid, r);
217 * For BARs, we release the resource from the PCI bus
218 * when the last child reference goes away.
220 bar = PCI_RID2BAR(rid);
221 if (bar < 0 || bar > PCIR_MAX_BAR_0)
223 sc = device_get_softc(dev);
224 if (sc->isab_pci_res[bar].ip_res == NULL)
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--;
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);
236 sc->isab_pci_res[bar].ip_res = NULL;
237 sc->isab_pci_res[bar].ip_refs = 0;
242 return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type,