1 /* $OpenBSD: pcib.c,v 1.4 2012/08/18 16:00:20 miod Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/device.h>
35
36 #include <machine/autoconf.h>
37 #include <machine/bus.h>
38
39 #include <dev/pci/pcireg.h>
40 #include <dev/pci/pcivar.h>
41 #include <dev/pci/pcidevs.h>
42
43 #include <dev/isa/isavar.h>
44
45 #include <dev/pci/glxreg.h>
46 #include <dev/pci/glxvar.h>
47
48 #include "isa.h"
49
50 int pcibmatch(struct device *, void *, void *);
51 void pcibattach(struct device *, struct device *, void *);
52
53 struct pcib_softc {
54 struct device sc_dev;
55 bus_space_tag_t sc_iot;
56 bus_space_tag_t sc_memt;
57 bus_dma_tag_t sc_dmat;
58 };
59
60 const struct cfattach pcib_ca = {
61 sizeof(struct pcib_softc), pcibmatch, pcibattach
62 };
63
64 void pcib_callback(struct device *);
65 void pcib_isa_attach(struct pcib_softc *, bus_space_tag_t, bus_space_tag_t,
66 bus_dma_tag_t);
67 int pcib_print(void *, const char *);
68
69 struct cfdriver pcib_cd = {
70 NULL, "pcib", DV_DULL
71 };
72
73 int
pcibmatch(struct device * parent,void * match,void * aux)74 pcibmatch(struct device *parent, void *match, void *aux)
75 {
76 struct pci_attach_args *pa = aux;
77
78 switch (PCI_VENDOR(pa->pa_id)) {
79 case PCI_VENDOR_INTEL:
80 switch (PCI_PRODUCT(pa->pa_id)) {
81 case PCI_PRODUCT_INTEL_SIO:
82 case PCI_PRODUCT_INTEL_82371MX:
83 case PCI_PRODUCT_INTEL_82371AB_ISA:
84 case PCI_PRODUCT_INTEL_82440MX_ISA:
85 /* The above bridges mis-identify themselves */
86 return (1);
87 }
88 break;
89 case PCI_VENDOR_SIS:
90 switch (PCI_PRODUCT(pa->pa_id)) {
91 case PCI_PRODUCT_SIS_85C503:
92 /* mis-identifies itself as a miscellaneous prehistoric */
93 return (1);
94 }
95 break;
96 case PCI_VENDOR_VIATECH:
97 switch (PCI_PRODUCT(pa->pa_id)) {
98 case PCI_PRODUCT_VIATECH_VT82C686A_SMB:
99 /* mis-identifies itself as a ISA bridge */
100 return (0);
101 }
102 break;
103 }
104
105 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
106 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA)
107 return (1);
108
109 return (0);
110 }
111
112 void
pcibattach(struct device * parent,struct device * self,void * aux)113 pcibattach(struct device *parent, struct device *self, void *aux)
114 {
115 struct pcib_softc *sc = (struct pcib_softc *)self;
116 struct pci_attach_args *pa = (struct pci_attach_args *)aux;
117
118 printf("\n");
119
120 /*
121 * If we are actually a glxpcib, we can't use softc fields
122 * beyond the base struct device, for this would corrupt
123 * the glxpcib softc. Decide to attach isa immediately in this
124 * case - glxpcib-based designs are not expected to have ISA
125 * slots and attaching isa early should not cause problems.
126 */
127 if (strncmp(self->dv_xname, "glxpcib", 7) == 0) {
128 pcib_isa_attach(sc, pa->pa_iot, pa->pa_memt, pa->pa_dmat);
129 } else {
130 /*
131 * Wait until all PCI devices are attached before attaching isa;
132 * existing pcib code on other platforms mentions that not
133 * doing this ``might mess the interrupt setup on some
134 * systems'', although this is very unlikely to be the case
135 * on loongson.
136 */
137 sc->sc_iot = pa->pa_iot;
138 sc->sc_memt = pa->pa_memt;
139 sc->sc_dmat = pa->pa_dmat;
140 config_defer(self, pcib_callback);
141 }
142 }
143
144 void
pcib_callback(struct device * self)145 pcib_callback(struct device *self)
146 {
147 struct pcib_softc *sc = (struct pcib_softc *)self;
148
149 pcib_isa_attach(sc, sc->sc_iot, sc->sc_memt, sc->sc_dmat);
150 }
151
152 void
pcib_isa_attach(struct pcib_softc * sc,bus_space_tag_t iot,bus_space_tag_t memt,bus_dma_tag_t dmat)153 pcib_isa_attach(struct pcib_softc *sc, bus_space_tag_t iot,
154 bus_space_tag_t memt, bus_dma_tag_t dmat)
155 {
156 struct isabus_attach_args iba;
157
158 /*
159 * Attach the ISA bus behind this bridge.
160 */
161 memset(&iba, 0, sizeof(iba));
162 iba.iba_busname = "isa";
163 iba.iba_iot = iot;
164 iba.iba_memt = memt;
165 #if NISADMA > 0
166 iba.iba_dmat = dmat;
167 #endif
168 iba.iba_ic = sys_platform->isa_chipset;
169 if (iba.iba_ic != NULL)
170 config_found(&sc->sc_dev, &iba, pcib_print);
171 }
172
173 int
pcib_print(void * aux,const char * pnp)174 pcib_print(void *aux, const char *pnp)
175 {
176 /* Only ISAs can attach to pcib's; easy. */
177 if (pnp)
178 printf("isa at %s", pnp);
179 return (UNCONF);
180 }
181