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
47int	pcibmatch(struct device *, void *, void *);
48void	pcibattach(struct device *, struct device *, void *);
49void	pcib_callback(struct device *);
50int	pcib_print(void *, const char *);
51
52const struct cfattach pcib_ca = {
53	sizeof(struct device), pcibmatch, pcibattach
54};
55
56struct cfdriver pcib_cd = {
57	NULL, "pcib", DV_DULL
58};
59
60int
61pcibmatch(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
99void
100pcibattach(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
110void
111pcib_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
128int
129pcib_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