FreeBSD/Linux Kernel Cross Reference
sys/pci/agp_ali.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_ali_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_ali_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 0x154110b9:
66 return ("Ali M1541 host to AGP bridge");
67 };
68
69 if (pci_get_vendor(dev) == 0x10b9)
70 return ("Ali Generic host to PCI bridge");
71
72 return NULL;
73 }
74
75 static int
76 agp_ali_probe(device_t dev)
77 {
78 const char *desc;
79
80 desc = agp_ali_match(dev);
81 if (desc) {
82 device_verbose(dev);
83 device_set_desc(dev, desc);
84 return 0;
85 }
86
87 return ENXIO;
88 }
89
90 static int
91 agp_ali_attach(device_t dev)
92 {
93 struct agp_ali_softc *sc = device_get_softc(dev);
94 struct agp_gatt *gatt;
95 int error;
96
97 error = agp_generic_attach(dev);
98 if (error)
99 return error;
100
101 sc->initial_aperture = AGP_GET_APERTURE(dev);
102
103 for (;;) {
104 gatt = agp_alloc_gatt(dev);
105 if (gatt)
106 break;
107
108 /*
109 * Probably contigmalloc failure. Try reducing the
110 * aperture so that the gatt size reduces.
111 */
112 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
113 agp_generic_detach(dev);
114 return ENOMEM;
115 }
116 }
117 sc->gatt = gatt;
118
119 /* Install the gatt. */
120 pci_write_config(dev, AGP_ALI_ATTBASE,
121 (gatt->ag_physical
122 | (pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff)),
123 4);
124
125 /* Enable the TLB. */
126 pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
127
128 return 0;
129 }
130
131 static int
132 agp_ali_detach(device_t dev)
133 {
134 struct agp_ali_softc *sc = device_get_softc(dev);
135 int error;
136
137 error = agp_generic_detach(dev);
138 if (error)
139 return error;
140
141 /* Disable the TLB.. */
142 pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
143
144 /* Put the aperture back the way it started. */
145 AGP_SET_APERTURE(dev, sc->initial_aperture);
146 pci_write_config(dev, AGP_ALI_ATTBASE,
147 pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff,
148 4);
149
150 agp_free_gatt(sc->gatt);
151 return 0;
152 }
153
154 #define M 1024*1024
155
156 static u_int32_t agp_ali_table[] = {
157 0, /* 0 - invalid */
158 1, /* 1 - invalid */
159 2, /* 2 - invalid */
160 4*M, /* 3 - invalid */
161 8*M, /* 4 - invalid */
162 0, /* 5 - invalid */
163 16*M, /* 6 - invalid */
164 32*M, /* 7 - invalid */
165 64*M, /* 8 - invalid */
166 128*M, /* 9 - invalid */
167 256*M, /* 10 - invalid */
168 };
169 #define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
170
171 static u_int32_t
172 agp_ali_get_aperture(device_t dev)
173 {
174 /*
175 * The aperture size is derived from the low bits of attbase.
176 * I'm not sure this is correct..
177 */
178 int i = pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff;
179 if (i >= agp_ali_table_size)
180 return 0;
181 return agp_ali_table[i];
182 }
183
184 static int
185 agp_ali_set_aperture(device_t dev, u_int32_t aperture)
186 {
187 int i;
188
189 for (i = 0; i < agp_ali_table_size; i++)
190 if (agp_ali_table[i] == aperture)
191 break;
192 if (i == agp_ali_table_size)
193 return EINVAL;
194
195 pci_write_config(dev, AGP_ALI_ATTBASE,
196 ((pci_read_config(dev, AGP_ALI_ATTBASE, 4) & ~0xff)
197 | i), 4);
198 return 0;
199 }
200
201 static int
202 agp_ali_bind_page(device_t dev, int offset, vm_offset_t physical)
203 {
204 struct agp_ali_softc *sc = device_get_softc(dev);
205
206 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
207 return EINVAL;
208
209 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
210 return 0;
211 }
212
213 static int
214 agp_ali_unbind_page(device_t dev, int offset)
215 {
216 struct agp_ali_softc *sc = device_get_softc(dev);
217
218 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
219 return EINVAL;
220
221 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
222 return 0;
223 }
224
225 static void
226 agp_ali_flush_tlb(device_t dev)
227 {
228 pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
229 pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
230 }
231
232 static device_method_t agp_ali_methods[] = {
233 /* Device interface */
234 DEVMETHOD(device_probe, agp_ali_probe),
235 DEVMETHOD(device_attach, agp_ali_attach),
236 DEVMETHOD(device_detach, agp_ali_detach),
237 DEVMETHOD(device_shutdown, bus_generic_shutdown),
238 DEVMETHOD(device_suspend, bus_generic_suspend),
239 DEVMETHOD(device_resume, bus_generic_resume),
240
241 /* AGP interface */
242 DEVMETHOD(agp_get_aperture, agp_ali_get_aperture),
243 DEVMETHOD(agp_set_aperture, agp_ali_set_aperture),
244 DEVMETHOD(agp_bind_page, agp_ali_bind_page),
245 DEVMETHOD(agp_unbind_page, agp_ali_unbind_page),
246 DEVMETHOD(agp_flush_tlb, agp_ali_flush_tlb),
247 DEVMETHOD(agp_enable, agp_generic_enable),
248 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
249 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
250 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
251 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
252
253 { 0, 0 }
254 };
255
256 static driver_t agp_ali_driver = {
257 "agp",
258 agp_ali_methods,
259 sizeof(struct agp_ali_softc),
260 };
261
262 static devclass_t agp_devclass;
263
264 DRIVER_MODULE(agp_ali, pci, agp_ali_driver, agp_devclass, 0, 0);
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