FreeBSD/Linux Kernel Cross Reference
sys/pci/agp_via.c
1 /*-
2 * Copyright (c) 2000 Doug Rabson
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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/5.1/sys/pci/agp_via.c 113506 2003-04-15 06:37:30Z mdodd $
27 */
28
29 #include "opt_bus.h"
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/kernel.h>
35 #include <sys/bus.h>
36 #include <sys/lock.h>
37 #include <sys/lockmgr.h>
38 #include <sys/mutex.h>
39 #include <sys/proc.h>
40
41 #include <pci/pcivar.h>
42 #include <pci/pcireg.h>
43 #include <pci/agppriv.h>
44 #include <pci/agpreg.h>
45
46 #include <vm/vm.h>
47 #include <vm/vm_object.h>
48 #include <vm/pmap.h>
49
50 struct agp_via_softc {
51 struct agp_softc agp;
52 u_int32_t initial_aperture; /* aperture size at startup */
53 struct agp_gatt *gatt;
54 };
55
56 static const char*
57 agp_via_match(device_t dev)
58 {
59 if (pci_get_class(dev) != PCIC_BRIDGE
60 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
61 return NULL;
62
63 if (agp_find_caps(dev) == 0)
64 return NULL;
65
66 switch (pci_get_devid(dev)) {
67 case 0x05011106:
68 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
69 case 0x05971106:
70 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
71 case 0x05981106:
72 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
73 case 0x06911106:
74 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
75 case 0x03051106:
76 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
77 };
78
79 if (pci_get_vendor(dev) == 0x1106)
80 return ("VIA Generic host to PCI bridge");
81
82 return NULL;
83 }
84
85 static int
86 agp_via_probe(device_t dev)
87 {
88 const char *desc;
89
90 desc = agp_via_match(dev);
91 if (desc) {
92 device_verbose(dev);
93 device_set_desc(dev, desc);
94 return 0;
95 }
96
97 return ENXIO;
98 }
99
100 static int
101 agp_via_attach(device_t dev)
102 {
103 struct agp_via_softc *sc = device_get_softc(dev);
104 struct agp_gatt *gatt;
105 int error;
106
107 error = agp_generic_attach(dev);
108 if (error)
109 return error;
110
111 sc->initial_aperture = AGP_GET_APERTURE(dev);
112
113 for (;;) {
114 gatt = agp_alloc_gatt(dev);
115 if (gatt)
116 break;
117
118 /*
119 * Probably contigmalloc failure. Try reducing the
120 * aperture so that the gatt size reduces.
121 */
122 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
123 agp_generic_detach(dev);
124 return ENOMEM;
125 }
126 }
127 sc->gatt = gatt;
128
129 /* Install the gatt. */
130 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
131
132 /* Enable the aperture. */
133 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
134
135 return 0;
136 }
137
138 static int
139 agp_via_detach(device_t dev)
140 {
141 struct agp_via_softc *sc = device_get_softc(dev);
142 int error;
143
144 error = agp_generic_detach(dev);
145 if (error)
146 return error;
147
148 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
149 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
150 AGP_SET_APERTURE(dev, sc->initial_aperture);
151 agp_free_gatt(sc->gatt);
152
153 return 0;
154 }
155
156 static u_int32_t
157 agp_via_get_aperture(device_t dev)
158 {
159 u_int32_t apsize;
160
161 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
162
163 /*
164 * The size is determined by the number of low bits of
165 * register APBASE which are forced to zero. The low 20 bits
166 * are always forced to zero and each zero bit in the apsize
167 * field just read forces the corresponding bit in the 27:20
168 * to be zero. We calculate the aperture size accordingly.
169 */
170 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
171 }
172
173 static int
174 agp_via_set_aperture(device_t dev, u_int32_t aperture)
175 {
176 u_int32_t apsize;
177
178 /*
179 * Reverse the magic from get_aperture.
180 */
181 apsize = ((aperture - 1) >> 20) ^ 0xff;
182
183 /*
184 * Double check for sanity.
185 */
186 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
187 return EINVAL;
188
189 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
190
191 return 0;
192 }
193
194 static int
195 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
196 {
197 struct agp_via_softc *sc = device_get_softc(dev);
198
199 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
200 return EINVAL;
201
202 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
203 return 0;
204 }
205
206 static int
207 agp_via_unbind_page(device_t dev, int offset)
208 {
209 struct agp_via_softc *sc = device_get_softc(dev);
210
211 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
212 return EINVAL;
213
214 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
215 return 0;
216 }
217
218 static void
219 agp_via_flush_tlb(device_t dev)
220 {
221 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
222 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
223 }
224
225 static device_method_t agp_via_methods[] = {
226 /* Device interface */
227 DEVMETHOD(device_probe, agp_via_probe),
228 DEVMETHOD(device_attach, agp_via_attach),
229 DEVMETHOD(device_detach, agp_via_detach),
230 DEVMETHOD(device_shutdown, bus_generic_shutdown),
231 DEVMETHOD(device_suspend, bus_generic_suspend),
232 DEVMETHOD(device_resume, bus_generic_resume),
233
234 /* AGP interface */
235 DEVMETHOD(agp_get_aperture, agp_via_get_aperture),
236 DEVMETHOD(agp_set_aperture, agp_via_set_aperture),
237 DEVMETHOD(agp_bind_page, agp_via_bind_page),
238 DEVMETHOD(agp_unbind_page, agp_via_unbind_page),
239 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb),
240 DEVMETHOD(agp_enable, agp_generic_enable),
241 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
242 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
243 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
244 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
245
246 { 0, 0 }
247 };
248
249 static driver_t agp_via_driver = {
250 "agp",
251 agp_via_methods,
252 sizeof(struct agp_via_softc),
253 };
254
255 static devclass_t agp_devclass;
256
257 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
258 MODULE_DEPEND(agp_via, agp, 1, 1, 1);
259 MODULE_DEPEND(agp_via, pci, 1, 1, 1);
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