FreeBSD/Linux Kernel Cross Reference
sys/pci/agp_sis.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 * $FreeBSD$
27 */
28
29 #include "opt_bus.h"
30 #include "opt_pci.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/bus.h>
37 #include <sys/lock.h>
38
39 #include <pci/pcivar.h>
40 #include <pci/pcireg.h>
41 #include <pci/agppriv.h>
42 #include <pci/agpreg.h>
43
44 #include <vm/vm.h>
45 #include <vm/vm_object.h>
46 #include <vm/pmap.h>
47
48 struct agp_sis_softc {
49 struct agp_softc agp;
50 u_int32_t initial_aperture; /* aperture size at startup */
51 struct agp_gatt *gatt;
52 };
53
54 static const char*
55 agp_sis_match(device_t dev)
56 {
57 if (pci_get_class(dev) != PCIC_BRIDGE
58 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
59 return NULL;
60
61 if (agp_find_caps(dev) == 0)
62 return NULL;
63
64 switch (pci_get_devid(dev)) {
65 case 0x00011039:
66 return ("SiS 5591 host to AGP bridge");
67 case 0x06481039:
68 return ("SiS 648 host to AGP bridge");
69 };
70
71 if (pci_get_vendor(dev) == 0x1039)
72 return ("SIS Generic host to PCI bridge");
73
74 return NULL;
75 }
76
77 static int
78 agp_sis_probe(device_t dev)
79 {
80 const char *desc;
81
82 desc = agp_sis_match(dev);
83 if (desc) {
84 device_verbose(dev);
85 device_set_desc(dev, desc);
86 return 0;
87 }
88
89 return ENXIO;
90 }
91
92 static int
93 agp_sis_attach(device_t dev)
94 {
95 struct agp_sis_softc *sc = device_get_softc(dev);
96 struct agp_gatt *gatt;
97 int error;
98
99 error = agp_generic_attach(dev);
100 if (error)
101 return error;
102
103 sc->initial_aperture = AGP_GET_APERTURE(dev);
104
105 for (;;) {
106 gatt = agp_alloc_gatt(dev);
107 if (gatt)
108 break;
109
110 /*
111 * Probably contigmalloc failure. Try reducing the
112 * aperture so that the gatt size reduces.
113 */
114 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
115 agp_generic_detach(dev);
116 return ENOMEM;
117 }
118 }
119 sc->gatt = gatt;
120
121 /* Install the gatt. */
122 pci_write_config(dev, AGP_SIS_ATTBASE, gatt->ag_physical, 4);
123
124 /* Enable the aperture. */
125 pci_write_config(dev, AGP_SIS_WINCTRL,
126 pci_read_config(dev, AGP_SIS_WINCTRL, 1) | 3, 1);
127
128 /*
129 * Enable the TLB and make it automatically invalidate entries
130 * when the GATT is written.
131 */
132 pci_write_config(dev, AGP_SIS_TLBCTRL, 0x05, 1);
133
134 return 0;
135 }
136
137 static int
138 agp_sis_detach(device_t dev)
139 {
140 struct agp_sis_softc *sc = device_get_softc(dev);
141 int error;
142
143 error = agp_generic_detach(dev);
144 if (error)
145 return error;
146
147 /* Disable the aperture.. */
148 pci_write_config(dev, AGP_SIS_WINCTRL,
149 pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~3, 1);
150
151 /* and the TLB. */
152 pci_write_config(dev, AGP_SIS_TLBCTRL, 0, 1);
153
154 /* Put the aperture back the way it started. */
155 AGP_SET_APERTURE(dev, sc->initial_aperture);
156
157 agp_free_gatt(sc->gatt);
158 return 0;
159 }
160
161 static u_int32_t
162 agp_sis_get_aperture(device_t dev)
163 {
164 int gws;
165
166 /*
167 * The aperture size is equal to 4M<<gws.
168 */
169 gws = (pci_read_config(dev, AGP_SIS_WINCTRL, 1) & 0x70) >> 4;
170 return (4*1024*1024) << gws;
171 }
172
173 static int
174 agp_sis_set_aperture(device_t dev, u_int32_t aperture)
175 {
176 int gws;
177
178 /*
179 * Check for a power of two and make sure its within the
180 * programmable range.
181 */
182 if (aperture & (aperture - 1)
183 || aperture < 4*1024*1024
184 || aperture > 256*1024*1024)
185 return EINVAL;
186
187 gws = ffs(aperture / 4*1024*1024) - 1;
188
189 pci_write_config(dev, AGP_SIS_WINCTRL,
190 ((pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~0x70)
191 | gws << 4), 1);
192
193 return 0;
194 }
195
196 static int
197 agp_sis_bind_page(device_t dev, int offset, vm_offset_t physical)
198 {
199 struct agp_sis_softc *sc = device_get_softc(dev);
200
201 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
202 return EINVAL;
203
204 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
205 return 0;
206 }
207
208 static int
209 agp_sis_unbind_page(device_t dev, int offset)
210 {
211 struct agp_sis_softc *sc = device_get_softc(dev);
212
213 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
214 return EINVAL;
215
216 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
217 return 0;
218 }
219
220 static void
221 agp_sis_flush_tlb(device_t dev)
222 {
223 pci_write_config(dev, AGP_SIS_TLBFLUSH, 0x02, 1);
224 }
225
226 static device_method_t agp_sis_methods[] = {
227 /* Device interface */
228 DEVMETHOD(device_probe, agp_sis_probe),
229 DEVMETHOD(device_attach, agp_sis_attach),
230 DEVMETHOD(device_detach, agp_sis_detach),
231 DEVMETHOD(device_shutdown, bus_generic_shutdown),
232 DEVMETHOD(device_suspend, bus_generic_suspend),
233 DEVMETHOD(device_resume, bus_generic_resume),
234
235 /* AGP interface */
236 DEVMETHOD(agp_get_aperture, agp_sis_get_aperture),
237 DEVMETHOD(agp_set_aperture, agp_sis_set_aperture),
238 DEVMETHOD(agp_bind_page, agp_sis_bind_page),
239 DEVMETHOD(agp_unbind_page, agp_sis_unbind_page),
240 DEVMETHOD(agp_flush_tlb, agp_sis_flush_tlb),
241 DEVMETHOD(agp_enable, agp_generic_enable),
242 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
243 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
244 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
245 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
246
247 { 0, 0 }
248 };
249
250 static driver_t agp_sis_driver = {
251 "agp",
252 agp_sis_methods,
253 sizeof(struct agp_sis_softc),
254 };
255
256 static devclass_t agp_devclass;
257
258 DRIVER_MODULE(agp_sis, pci, agp_sis_driver, agp_devclass, 0, 0);
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