1 /* $NetBSD: pcib.c,v 1.21 2021/08/07 16:19:08 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996, 1998 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/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: pcib.c,v 1.21 2021/08/07 16:19:08 thorpej Exp $");
34
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/device.h>
39
40 #include <sys/bus.h>
41
42 #include <dev/isa/isavar.h>
43
44 #include <dev/pci/pcivar.h>
45 #include <dev/pci/pcireg.h>
46
47 #include <dev/pci/pcidevs.h>
48
49 #include "isa.h"
50 #include "pcibvar.h"
51
52 int pcibmatch(device_t, cfdata_t, void *);
53
54 CFATTACH_DECL3_NEW(pcib, sizeof(struct pcib_softc),
55 pcibmatch, pcibattach, pcibdetach, NULL, pcibrescan, pcibchilddet,
56 DVF_DETACH_SHUTDOWN);
57
58 void pcib_callback(device_t);
59
60 int
pcibmatch(device_t parent,cfdata_t match,void * aux)61 pcibmatch(device_t parent, cfdata_t match, void *aux)
62 {
63 struct pci_attach_args *pa = aux;
64
65 #if 0
66 /*
67 * PCI-ISA bridges are matched on class/subclass.
68 * This list contains only the bridges where correct
69 * (or incorrect) behaviour is not yet confirmed.
70 */
71 switch (PCI_VENDOR(pa->pa_id)) {
72 case PCI_VENDOR_INTEL:
73 switch (PCI_PRODUCT(pa->pa_id)) {
74 case PCI_PRODUCT_INTEL_82426EX:
75 case PCI_PRODUCT_INTEL_82380AB:
76 return (1);
77 }
78 break;
79
80 case PCI_VENDOR_UMC:
81 switch (PCI_PRODUCT(pa->pa_id)) {
82 case PCI_PRODUCT_UMC_UM8886F:
83 case PCI_PRODUCT_UMC_UM82C886:
84 return (1);
85 }
86 break;
87 case PCI_VENDOR_ALI:
88 switch (PCI_PRODUCT(pa->pa_id)) {
89 case PCI_PRODUCT_ALI_M1449:
90 case PCI_PRODUCT_ALI_M1543:
91 return (1);
92 }
93 break;
94 case PCI_VENDOR_COMPAQ:
95 switch (PCI_PRODUCT(pa->pa_id)) {
96 case PCI_PRODUCT_COMPAQ_PCI_ISA_BRIDGE:
97 return (1);
98 }
99 break;
100 case PCI_VENDOR_VIATECH:
101 switch (PCI_PRODUCT(pa->pa_id)) {
102 case PCI_PRODUCT_VIATECH_VT82C570MV:
103 case PCI_PRODUCT_VIATECH_VT82C586_ISA:
104 return (1);
105 }
106 break;
107 }
108 #endif
109
110 /*
111 * some special cases:
112 */
113 switch (PCI_VENDOR(pa->pa_id)) {
114 case PCI_VENDOR_INTEL:
115 switch (PCI_PRODUCT(pa->pa_id)) {
116 case PCI_PRODUCT_INTEL_SIO:
117 /*
118 * The Intel SIO identifies itself as a
119 * miscellaneous prehistoric.
120 */
121 case PCI_PRODUCT_INTEL_82371MX:
122 /*
123 * The Intel 82371MX identifies itself erroneously as a
124 * miscellaneous bridge.
125 */
126 case PCI_PRODUCT_INTEL_82371AB_ISA:
127 /*
128 * Some Intel 82371AB PCI-ISA bridge identifies
129 * itself as miscellaneous bridge.
130 */
131 return (1);
132 }
133 break;
134 case PCI_VENDOR_SIS:
135 switch (PCI_PRODUCT(pa->pa_id)) {
136 case PCI_PRODUCT_SIS_85C503:
137 /*
138 * The SIS 85C503 identifies itself as a
139 * miscellaneous prehistoric.
140 */
141 return (1);
142 }
143 break;
144 case PCI_VENDOR_VIATECH:
145 switch (PCI_PRODUCT(pa->pa_id)) {
146 case PCI_PRODUCT_VIATECH_VT82C686A_PWR:
147 /*
148 * The VIA VT82C686A Power Management Controller
149 * identifies itself as ISA bridge, but it's wrong !
150 */
151 return (0);
152 }
153 break;
154 /*
155 * The Cyrix cs5530 PCI host bridge does not have a broken
156 * latch on the i8254 clock core, unlike its predecessors
157 * the cs5510 and cs5520. This reverses the setting from
158 * i386/i386/identcpu.c where it arguably should not have
159 * been set in the first place. XXX
160 */
161 case PCI_VENDOR_CYRIX:
162 switch (PCI_PRODUCT(pa->pa_id)) {
163 case PCI_PRODUCT_CYRIX_CX5530_PCIB:
164 #if !defined(XENPV)
165 {
166 extern int clock_broken_latch;
167
168 clock_broken_latch = 0;
169 }
170 #endif
171 return (1);
172 }
173 break;
174 }
175
176 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_BRIDGE &&
177 PCI_SUBCLASS(pa->pa_class) == PCI_SUBCLASS_BRIDGE_ISA) {
178 return (1);
179 }
180
181 return (0);
182 }
183
184 void
pcibattach(device_t parent,device_t self,void * aux)185 pcibattach(device_t parent, device_t self, void *aux)
186 {
187 struct pcib_softc *sc = device_private(self);
188 struct pci_attach_args *pa = aux;
189
190 /*
191 * Just print out a description and defer configuration
192 * until all PCI devices have been attached.
193 */
194 pci_aprint_devinfo(pa, NULL);
195
196 sc->sc_pc = pa->pa_pc;
197 sc->sc_tag = pa->pa_tag;
198
199 if (!pmf_device_register(self, NULL, NULL))
200 aprint_error_dev(self, "couldn't establish power handler\n");
201
202 config_defer(self, pcib_callback);
203 }
204
205 int
pcibdetach(device_t self,int flags)206 pcibdetach(device_t self, int flags)
207 {
208 int rc;
209
210 if ((rc = config_detach_children(self, flags)) != 0)
211 return rc;
212 pmf_device_deregister(self);
213 return 0;
214 }
215
216 void
pcibchilddet(device_t self,device_t child)217 pcibchilddet(device_t self, device_t child)
218 {
219 struct pcib_softc *sc = device_private(self);
220
221 if (sc->sc_isabus == child)
222 sc->sc_isabus = NULL;
223 }
224
225 int
pcibrescan(device_t self,const char * ifattr,const int * loc)226 pcibrescan(device_t self, const char *ifattr, const int *loc)
227 {
228 struct pcib_softc *sc = device_private(self);
229 struct isabus_attach_args iba;
230
231 /*
232 * Even though pcib only has a single "isabus" interface
233 * attribute, this function is referenced by other drivers
234 * that carry more, so we go ahead and filter.
235 */
236 if (ifattr_match(ifattr, "isabus") && sc->sc_isabus == NULL) {
237 /*
238 * Attach the ISA bus behind this bridge.
239 */
240 memset(&iba, 0, sizeof(iba));
241 iba.iba_iot = x86_bus_space_io;
242 iba.iba_memt = x86_bus_space_mem;
243 #if NISA > 0
244 iba.iba_dmat = &isa_bus_dma_tag;
245 #endif
246 sc->sc_isabus =
247 config_found(self, &iba, isabusprint,
248 CFARGS(.iattr = "isabus"));
249 }
250 return 0;
251 }
252
253 void
pcib_callback(device_t self)254 pcib_callback(device_t self)
255 {
256 pcibrescan(self, "isabus", NULL);
257 }
258