1 /* $OpenBSD: pcib.c,v 1.26 2023/01/17 23:39:30 jsg Exp $ */
2 /* $NetBSD: pcib.c,v 1.6 1997/06/06 23:29:16 thorpej Exp $ */
3
4 /*-
5 * Copyright (c) 1996 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Jason R. Thorpe.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/device.h>
36
37 #include <machine/bus.h>
38 #include <dev/isa/isavar.h>
39
40 #include <dev/pci/pcivar.h>
41 #include <dev/pci/pcireg.h>
42
43 #include <dev/pci/pcidevs.h>
44
45 #include "isadma.h"
46 #include "pcibios.h"
47 #if NPCIBIOS > 0
48 #include <i386/pci/pcibiosvar.h>
49 #endif
50
51 int pcibmatch(struct device *, void *, void *);
52 void pcibattach(struct device *, struct device *, void *);
53 void pcib_callback(struct device *);
54 int pcib_print(void *, const char *);
55
56 const struct cfattach pcib_ca = {
57 sizeof(struct device), pcibmatch, pcibattach
58 };
59
60 struct cfdriver pcib_cd = {
61 NULL, "pcib", DV_DULL
62 };
63
64 int
pcibmatch(struct device * parent,void * match,void * aux)65 pcibmatch(struct device *parent, void *match, void *aux)
66 {
67 struct pci_attach_args *pa = aux;
68
69 switch (PCI_VENDOR(pa->pa_id)) {
70 case PCI_VENDOR_INTEL:
71 switch (PCI_PRODUCT(pa->pa_id)) {
72 case PCI_PRODUCT_INTEL_SIO:
73 case PCI_PRODUCT_INTEL_82371MX:
74 case PCI_PRODUCT_INTEL_82371AB_ISA:
75 case PCI_PRODUCT_INTEL_82440MX_ISA:
76 /* The above bridges mis-identify themselves */
77 return (1);
78 }
79 break;
80 case PCI_VENDOR_SIS:
81 switch (PCI_PRODUCT(pa->pa_id)) {
82 case PCI_PRODUCT_SIS_85C503:
83 /* mis-identifies itself as a miscellaneous prehistoric */
84 return (1);
85 }
86 break;
87 case PCI_VENDOR_VIATECH:
88 switch (PCI_PRODUCT(pa->pa_id)) {
89 case PCI_PRODUCT_VIATECH_VT82C686A_SMB:
90 /* mis-identifies itself as a ISA bridge */
91 return (0);
92 }
93 break;
94 }
95
96 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
97 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA)
98 return (1);
99
100 return (0);
101 }
102
103 void
pcibattach(struct device * parent,struct device * self,void * aux)104 pcibattach(struct device *parent, struct device *self, void *aux)
105 {
106 /*
107 * Cannot attach isa bus now; must postpone for various reasons
108 */
109 printf("\n");
110
111 config_defer(self, pcib_callback);
112 }
113
114 void
pcib_callback(struct device * self)115 pcib_callback(struct device *self)
116 {
117 struct isabus_attach_args iba;
118
119 #if NPCIBIOS > 0
120 pci_intr_post_fixup();
121 #endif
122
123 /*
124 * Attach the ISA bus behind this bridge.
125 */
126 memset(&iba, 0, sizeof(iba));
127 iba.iba_busname = "isa";
128 iba.iba_iot = I386_BUS_SPACE_IO;
129 iba.iba_memt = I386_BUS_SPACE_MEM;
130 #if NISADMA > 0
131 iba.iba_dmat = &isa_bus_dma_tag;
132 #endif
133 config_found(self, &iba, pcib_print);
134 }
135
136 int
pcib_print(void * aux,const char * pnp)137 pcib_print(void *aux, const char *pnp)
138 {
139 /* Only ISAs can attach to pcib's; easy. */
140 if (pnp)
141 printf("isa at %s", pnp);
142 return (UNCONF);
143 }
144