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 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
isab_pci_probe(device_t dev)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
isab_pci_attach(device_t dev)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 *
isab_pci_alloc_resource(device_t dev,device_t child,int type,int * rid,rman_res_t start,rman_res_t end,rman_res_t count,u_int flags)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
isab_pci_release_resource(device_t dev,device_t child,struct resource * r)202 isab_pci_release_resource(device_t dev, device_t child, struct resource *r)
203 {
204 struct isab_pci_softc *sc;
205 int bar, error;
206
207 if (device_get_parent(child) != dev)
208 return bus_generic_release_resource(dev, child, r);
209
210 switch (rman_get_type(r)) {
211 case SYS_RES_MEMORY:
212 case SYS_RES_IOPORT:
213 /*
214 * For BARs, we release the resource from the PCI bus
215 * when the last child reference goes away.
216 */
217 bar = PCI_RID2BAR(rman_get_rid(r));
218 if (bar < 0 || bar > PCIR_MAX_BAR_0)
219 return (EINVAL);
220 sc = device_get_softc(dev);
221 if (sc->isab_pci_res[bar].ip_res == NULL)
222 return (EINVAL);
223 KASSERT(sc->isab_pci_res[bar].ip_res == r,
224 ("isa_pci resource mismatch"));
225 if (sc->isab_pci_res[bar].ip_refs > 1) {
226 sc->isab_pci_res[bar].ip_refs--;
227 return (0);
228 }
229 KASSERT(sc->isab_pci_res[bar].ip_refs > 0,
230 ("isa_pci resource reference count underflow"));
231 error = bus_release_resource(dev, r);
232 if (error == 0) {
233 sc->isab_pci_res[bar].ip_res = NULL;
234 sc->isab_pci_res[bar].ip_refs = 0;
235 }
236 return (error);
237 }
238
239 return (bus_generic_release_resource(dev, child, r));
240 }
241