1 /*
2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/dev/pci/hostb_pci.c,v 1.1.8.1 2009/04/15 03:14:26 kensmith Exp $
27 */
28
29 #include <sys/param.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33
34 #include <sys/types.h>
35 #include <sys/systm.h>
36
37 #include <bus/pci/pcivar.h>
38 #include <bus/pci/pcireg.h>
39
40 /*
41 * Provide a device to "eat" the host->pci bridge devices that show up
42 * on PCI busses and stop them showing up twice on the probes. This also
43 * stops them showing up as 'none' in pciconf -l. If the host bridge
44 * provides an AGP capability then we create a child agp device for the
45 * agp GART driver to attach to.
46 */
47 static int
pci_hostb_probe(device_t dev)48 pci_hostb_probe(device_t dev)
49 {
50 u_int32_t id;
51 id = pci_get_devid(dev);
52
53 switch (id) {
54
55 /* VIA VT82C596 Power Managment Function */
56 case 0x30501106:
57 return (ENXIO);
58
59 default:
60 break;
61 }
62
63 if (pci_get_class(dev) == PCIC_BRIDGE &&
64 pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
65 device_set_desc(dev, "Host to PCI bridge");
66 device_quiet(dev);
67 return (-10000);
68 }
69 return (ENXIO);
70 }
71
72 static int
pci_hostb_attach(device_t dev)73 pci_hostb_attach(device_t dev)
74 {
75
76 bus_generic_probe(dev);
77
78 /*
79 * If AGP capabilities are present on this device, then create
80 * an AGP child.
81 */
82 if (pci_find_extcap(dev, PCIY_AGP, NULL) == 0)
83 device_add_child(dev, "agp", -1);
84 bus_generic_attach(dev);
85 return (0);
86 }
87
88 /* Bus interface. */
89
90 static int
pci_hostb_read_ivar(device_t dev,device_t child,int which,uintptr_t * result)91 pci_hostb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
92 {
93
94 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
95 }
96
97 static int
pci_hostb_write_ivar(device_t dev,device_t child,int which,uintptr_t value)98 pci_hostb_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
99 {
100
101 return (EINVAL);
102 }
103
104 static struct resource *
pci_hostb_alloc_resource(device_t dev,device_t child,int type,int * rid,u_long start,u_long end,u_long count,u_int flags,int cpuid __unused)105 pci_hostb_alloc_resource(device_t dev, device_t child, int type, int *rid,
106 u_long start, u_long end, u_long count, u_int flags, int cpuid __unused)
107 {
108
109 return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
110 }
111
112 static int
pci_hostb_release_resource(device_t dev,device_t child,int type,int rid,struct resource * r)113 pci_hostb_release_resource(device_t dev, device_t child, int type, int rid,
114 struct resource *r)
115 {
116
117 return (bus_release_resource(dev, type, rid, r));
118 }
119
120 /* PCI interface. */
121
122 static uint32_t
pci_hostb_read_config(device_t dev,device_t child,int reg,int width)123 pci_hostb_read_config(device_t dev, device_t child, int reg, int width)
124 {
125
126 return (pci_read_config(dev, reg, width));
127 }
128
129 static void
pci_hostb_write_config(device_t dev,device_t child,int reg,uint32_t val,int width)130 pci_hostb_write_config(device_t dev, device_t child, int reg,
131 uint32_t val, int width)
132 {
133
134 pci_write_config(dev, reg, val, width);
135 }
136
137 static int
pci_hostb_enable_busmaster(device_t dev,device_t child)138 pci_hostb_enable_busmaster(device_t dev, device_t child)
139 {
140
141 device_printf(dev, "child %s requested pci_enable_busmaster\n",
142 device_get_nameunit(child));
143 return (pci_enable_busmaster(dev));
144 }
145
146 static int
pci_hostb_disable_busmaster(device_t dev,device_t child)147 pci_hostb_disable_busmaster(device_t dev, device_t child)
148 {
149
150 device_printf(dev, "child %s requested pci_disable_busmaster\n",
151 device_get_nameunit(child));
152 return (pci_disable_busmaster(dev));
153 }
154
155 static int
pci_hostb_enable_io(device_t dev,device_t child,int space)156 pci_hostb_enable_io(device_t dev, device_t child, int space)
157 {
158
159 device_printf(dev, "child %s requested pci_enable_io\n",
160 device_get_nameunit(child));
161 return (pci_enable_io(dev, space));
162 }
163
164 static int
pci_hostb_disable_io(device_t dev,device_t child,int space)165 pci_hostb_disable_io(device_t dev, device_t child, int space)
166 {
167
168 device_printf(dev, "child %s requested pci_disable_io\n",
169 device_get_nameunit(child));
170 return (pci_disable_io(dev, space));
171 }
172
173 static int
pci_hostb_set_powerstate(device_t dev,device_t child,int state)174 pci_hostb_set_powerstate(device_t dev, device_t child, int state)
175 {
176
177 device_printf(dev, "child %s requested pci_set_powerstate\n",
178 device_get_nameunit(child));
179 return (pci_set_powerstate(dev, state));
180 }
181
182 static int
pci_hostb_get_powerstate(device_t dev,device_t child)183 pci_hostb_get_powerstate(device_t dev, device_t child)
184 {
185
186 device_printf(dev, "child %s requested pci_get_powerstate\n",
187 device_get_nameunit(child));
188 return (pci_get_powerstate(dev));
189 }
190
191 static int
pci_hostb_assign_interrupt(device_t dev,device_t child)192 pci_hostb_assign_interrupt(device_t dev, device_t child)
193 {
194
195 device_printf(dev, "child %s requested pci_assign_interrupt\n",
196 device_get_nameunit(child));
197 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
198 }
199
200 static int
pci_hostb_find_extcap(device_t dev,device_t child,int capability,int * capreg)201 pci_hostb_find_extcap(device_t dev, device_t child, int capability,
202 int *capreg)
203 {
204
205 return (pci_find_extcap(dev, capability, capreg));
206 }
207
208 static device_method_t pci_hostb_methods[] = {
209 /* Device interface */
210 DEVMETHOD(device_probe, pci_hostb_probe),
211 DEVMETHOD(device_attach, pci_hostb_attach),
212 DEVMETHOD(device_shutdown, bus_generic_shutdown),
213 DEVMETHOD(device_suspend, bus_generic_suspend),
214 DEVMETHOD(device_resume, bus_generic_resume),
215
216 /* Bus interface */
217 DEVMETHOD(bus_read_ivar, pci_hostb_read_ivar),
218 DEVMETHOD(bus_write_ivar, pci_hostb_write_ivar),
219 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
220 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
221
222 DEVMETHOD(bus_alloc_resource, pci_hostb_alloc_resource),
223 DEVMETHOD(bus_release_resource, pci_hostb_release_resource),
224 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
225 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
226
227 /* PCI interface */
228 DEVMETHOD(pci_read_config, pci_hostb_read_config),
229 DEVMETHOD(pci_write_config, pci_hostb_write_config),
230 DEVMETHOD(pci_enable_busmaster, pci_hostb_enable_busmaster),
231 DEVMETHOD(pci_disable_busmaster, pci_hostb_disable_busmaster),
232 DEVMETHOD(pci_enable_io, pci_hostb_enable_io),
233 DEVMETHOD(pci_disable_io, pci_hostb_disable_io),
234 DEVMETHOD(pci_get_powerstate, pci_hostb_get_powerstate),
235 DEVMETHOD(pci_set_powerstate, pci_hostb_set_powerstate),
236 DEVMETHOD(pci_assign_interrupt, pci_hostb_assign_interrupt),
237 DEVMETHOD(pci_find_extcap, pci_hostb_find_extcap),
238
239 DEVMETHOD_END
240 };
241
242 static driver_t pci_hostb_driver = {
243 "hostb",
244 pci_hostb_methods,
245 1,
246 };
247
248 static devclass_t pci_hostb_devclass;
249
250 DRIVER_MODULE(hostb, pci, pci_hostb_driver, pci_hostb_devclass, NULL, NULL);
251