1 /* $OpenBSD: pcib.c,v 1.7 2022/02/21 11:03:39 mpi 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 "isa.h"
46
47 int pcibmatch(struct device *, void *, void *);
48 void pcibattach(struct device *, struct device *, void *);
49 void pcib_callback(struct device *);
50 int pcib_print(void *, const char *);
51
52 const struct cfattach pcib_ca = {
53 sizeof(struct device), pcibmatch, pcibattach
54 };
55
56 struct cfdriver pcib_cd = {
57 NULL, "pcib", DV_DULL
58 };
59
60 int
pcibmatch(struct device * parent,void * match,void * aux)61 pcibmatch(struct device *parent, void *match, void *aux)
62 {
63 struct pci_attach_args *pa = aux;
64
65 switch (PCI_VENDOR(pa->pa_id)) {
66 case PCI_VENDOR_INTEL:
67 switch (PCI_PRODUCT(pa->pa_id)) {
68 case PCI_PRODUCT_INTEL_SIO:
69 case PCI_PRODUCT_INTEL_82371MX:
70 case PCI_PRODUCT_INTEL_82371AB_ISA:
71 case PCI_PRODUCT_INTEL_82440MX_ISA:
72 /* The above bridges mis-identify themselves */
73 return (1);
74 }
75 break;
76 case PCI_VENDOR_SIS:
77 switch (PCI_PRODUCT(pa->pa_id)) {
78 case PCI_PRODUCT_SIS_85C503:
79 /* mis-identifies itself as a miscellaneous prehistoric */
80 return (1);
81 }
82 break;
83 case PCI_VENDOR_VIATECH:
84 switch (PCI_PRODUCT(pa->pa_id)) {
85 case PCI_PRODUCT_VIATECH_VT82C686A_SMB:
86 /* mis-identifies itself as a ISA bridge */
87 return (0);
88 }
89 break;
90 }
91
92 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
93 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA)
94 return (1);
95
96 return (0);
97 }
98
99 void
pcibattach(struct device * parent,struct device * self,void * aux)100 pcibattach(struct device *parent, struct device *self, void *aux)
101 {
102 /*
103 * Cannot attach isa bus now; must postpone for various reasons
104 */
105 printf("\n");
106
107 config_defer(self, pcib_callback);
108 }
109
110 void
pcib_callback(struct device * self)111 pcib_callback(struct device *self)
112 {
113 struct isabus_attach_args iba;
114
115 /*
116 * Attach the ISA bus behind this bridge.
117 */
118 memset(&iba, 0, sizeof(iba));
119 iba.iba_busname = "isa";
120 iba.iba_iot = X86_BUS_SPACE_IO;
121 iba.iba_memt = X86_BUS_SPACE_MEM;
122 #if NISADMA > 0
123 iba.iba_dmat = &isa_bus_dma_tag;
124 #endif
125 config_found(self, &iba, pcib_print);
126 }
127
128 int
pcib_print(void * aux,const char * pnp)129 pcib_print(void *aux, const char *pnp)
130 {
131 /* Only ISAs can attach to pcib's; easy. */
132 if (pnp)
133 printf("isa at %s", pnp);
134 return (UNCONF);
135 }
136