2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 * PCI:ISA bridge support
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
44 #include <isa/isavar.h>
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pcireg.h>
48 #include <machine/bus.h>
50 #include <machine/resource.h>
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, u_long start, u_long end, u_long count,
57 static int isab_pci_release_resource(device_t dev, device_t child,
58 int type, int rid, struct resource *r);
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),
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),
81 struct isab_pci_resource {
82 struct resource *ip_res;
86 struct isab_pci_softc {
87 struct isab_pci_resource isab_pci_res[PCIR_MAX_BAR_0 + 1];
90 static driver_t isab_driver = {
93 sizeof(struct isab_pci_softc),
96 DRIVER_MODULE(isab, pci, isab_driver, isab_devclass, 0, 0);
99 * XXX we need to add a quirk list here for bridges that don't correctly
103 isab_pci_probe(device_t dev)
108 * Try for a generic match based on class/subclass.
110 if ((pci_get_class(dev) == PCIC_BRIDGE) &&
111 (pci_get_subclass(dev) == PCIS_BRIDGE_ISA)) {
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
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 0x00011033: /* NEC 0001 (C-bus) */
140 case 0x002c1033: /* NEC 002C (C-bus) */
141 case 0x003b1033: /* NEC 003B (C-bus) */
142 case 0x886a1060: /* UMC UM8886 ISA */
143 case 0x02001166: /* ServerWorks IB6566 PCI */
145 printf("PCI-ISA bridge with incorrect subclass 0x%x\n",
146 pci_get_subclass(dev));
156 device_set_desc(dev, "PCI-ISA bridge");
163 isab_pci_attach(device_t dev)
166 bus_generic_probe(dev);
167 return (isab_attach(dev));
170 static struct resource *
171 isab_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
172 u_long start, u_long end, u_long count, u_int flags)
174 struct isab_pci_softc *sc;
177 if (device_get_parent(child) != dev)
178 return bus_generic_alloc_resource(dev, child, type, rid, start,
185 * For BARs, we cache the resource so that we only allocate it
186 * from the PCI bus once.
188 bar = PCI_RID2BAR(*rid);
189 if (bar < 0 || bar > PCIR_MAX_BAR_0)
191 sc = device_get_softc(dev);
192 if (sc->isab_pci_res[bar].ip_res == NULL)
193 sc->isab_pci_res[bar].ip_res = bus_alloc_resource(dev, type,
194 rid, start, end, count, flags);
195 if (sc->isab_pci_res[bar].ip_res != NULL)
196 sc->isab_pci_res[bar].ip_refs++;
197 return (sc->isab_pci_res[bar].ip_res);
200 return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid,
201 start, end, count, flags));
205 isab_pci_release_resource(device_t dev, device_t child, int type, int rid,
208 struct isab_pci_softc *sc;
211 if (device_get_parent(child) != dev)
212 return bus_generic_release_resource(dev, child, type, rid, r);
218 * For BARs, we release the resource from the PCI bus
219 * when the last child reference goes away.
221 bar = PCI_RID2BAR(rid);
222 if (bar < 0 || bar > PCIR_MAX_BAR_0)
224 sc = device_get_softc(dev);
225 if (sc->isab_pci_res[bar].ip_res == NULL)
227 KASSERT(sc->isab_pci_res[bar].ip_res == r,
228 ("isa_pci resource mismatch"));
229 if (sc->isab_pci_res[bar].ip_refs > 1) {
230 sc->isab_pci_res[bar].ip_refs--;
233 KASSERT(sc->isab_pci_res[bar].ip_refs > 0,
234 ("isa_pci resource reference count underflow"));
235 error = bus_release_resource(dev, type, rid, r);
237 sc->isab_pci_res[bar].ip_res = NULL;
238 sc->isab_pci_res[bar].ip_refs = 0;
243 return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type,