2 * Copyright (c) 2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/pci/agp_via.c,v 1.1.2.2 2001/10/04 09:53:04 ru Exp $
27 * $DragonFly: src/sys/dev/agp/agp_via.c,v 1.3 2003/08/07 21:16:48 dillon Exp $
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
40 #include <bus/pci/pcivar.h>
41 #include <bus/pci/pcireg.h>
46 #include <vm/vm_object.h>
49 struct agp_via_softc {
51 u_int32_t initial_aperture; /* aperture size at startup */
52 struct agp_gatt *gatt;
56 agp_via_match(device_t dev)
58 if (pci_get_class(dev) != PCIC_BRIDGE
59 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
62 if (agp_find_caps(dev) == 0)
65 switch (pci_get_devid(dev)) {
67 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
69 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
71 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
73 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
75 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
78 if (pci_get_vendor(dev) == 0x1106)
79 return ("VIA Generic host to PCI bridge");
85 agp_via_probe(device_t dev)
89 desc = agp_via_match(dev);
92 device_set_desc(dev, desc);
100 agp_via_attach(device_t dev)
102 struct agp_via_softc *sc = device_get_softc(dev);
103 struct agp_gatt *gatt;
106 error = agp_generic_attach(dev);
110 sc->initial_aperture = AGP_GET_APERTURE(dev);
113 gatt = agp_alloc_gatt(dev);
118 * Probably contigmalloc failure. Try reducing the
119 * aperture so that the gatt size reduces.
121 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
122 agp_generic_detach(dev);
128 /* Install the gatt. */
129 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
131 /* Enable the aperture. */
132 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
138 agp_via_detach(device_t dev)
140 struct agp_via_softc *sc = device_get_softc(dev);
143 error = agp_generic_detach(dev);
147 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
148 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
149 AGP_SET_APERTURE(dev, sc->initial_aperture);
150 agp_free_gatt(sc->gatt);
156 agp_via_get_aperture(device_t dev)
160 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
163 * The size is determined by the number of low bits of
164 * register APBASE which are forced to zero. The low 20 bits
165 * are always forced to zero and each zero bit in the apsize
166 * field just read forces the corresponding bit in the 27:20
167 * to be zero. We calculate the aperture size accordingly.
169 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
173 agp_via_set_aperture(device_t dev, u_int32_t aperture)
178 * Reverse the magic from get_aperture.
180 apsize = ((aperture - 1) >> 20) ^ 0xff;
183 * Double check for sanity.
185 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
188 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
194 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
196 struct agp_via_softc *sc = device_get_softc(dev);
198 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
201 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
206 agp_via_unbind_page(device_t dev, int offset)
208 struct agp_via_softc *sc = device_get_softc(dev);
210 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
213 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
218 agp_via_flush_tlb(device_t dev)
220 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
221 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
224 static device_method_t agp_via_methods[] = {
225 /* Device interface */
226 DEVMETHOD(device_probe, agp_via_probe),
227 DEVMETHOD(device_attach, agp_via_attach),
228 DEVMETHOD(device_detach, agp_via_detach),
229 DEVMETHOD(device_shutdown, bus_generic_shutdown),
230 DEVMETHOD(device_suspend, bus_generic_suspend),
231 DEVMETHOD(device_resume, bus_generic_resume),
234 DEVMETHOD(agp_get_aperture, agp_via_get_aperture),
235 DEVMETHOD(agp_set_aperture, agp_via_set_aperture),
236 DEVMETHOD(agp_bind_page, agp_via_bind_page),
237 DEVMETHOD(agp_unbind_page, agp_via_unbind_page),
238 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb),
239 DEVMETHOD(agp_enable, agp_generic_enable),
240 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
241 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
242 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
243 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
248 static driver_t agp_via_driver = {
251 sizeof(struct agp_via_softc),
254 static devclass_t agp_devclass;
256 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);