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
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
38 #include <sys/lockmgr.h>
39 #include <sys/mutex.h>
42 #include <pci/pcivar.h>
43 #include <pci/pcireg.h>
44 #include <pci/agppriv.h>
45 #include <pci/agpreg.h>
48 #include <vm/vm_object.h>
51 struct agp_via_softc {
53 u_int32_t initial_aperture; /* aperture size at startup */
54 struct agp_gatt *gatt;
58 agp_via_match(device_t dev)
60 if (pci_get_class(dev) != PCIC_BRIDGE
61 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
64 if (agp_find_caps(dev) == 0)
67 switch (pci_get_devid(dev)) {
69 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
71 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
73 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
75 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
77 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
80 if (pci_get_vendor(dev) == 0x1106)
81 return ("VIA Generic host to PCI bridge");
87 agp_via_probe(device_t dev)
91 desc = agp_via_match(dev);
94 device_set_desc(dev, desc);
102 agp_via_attach(device_t dev)
104 struct agp_via_softc *sc = device_get_softc(dev);
105 struct agp_gatt *gatt;
108 error = agp_generic_attach(dev);
112 sc->initial_aperture = AGP_GET_APERTURE(dev);
115 gatt = agp_alloc_gatt(dev);
120 * Probably contigmalloc failure. Try reducing the
121 * aperture so that the gatt size reduces.
123 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
124 agp_generic_detach(dev);
130 /* Install the gatt. */
131 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
133 /* Enable the aperture. */
134 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
140 agp_via_detach(device_t dev)
142 struct agp_via_softc *sc = device_get_softc(dev);
145 error = agp_generic_detach(dev);
149 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
150 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
151 AGP_SET_APERTURE(dev, sc->initial_aperture);
152 agp_free_gatt(sc->gatt);
158 agp_via_get_aperture(device_t dev)
162 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
165 * The size is determined by the number of low bits of
166 * register APBASE which are forced to zero. The low 20 bits
167 * are always forced to zero and each zero bit in the apsize
168 * field just read forces the corresponding bit in the 27:20
169 * to be zero. We calculate the aperture size accordingly.
171 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
175 agp_via_set_aperture(device_t dev, u_int32_t aperture)
180 * Reverse the magic from get_aperture.
182 apsize = ((aperture - 1) >> 20) ^ 0xff;
185 * Double check for sanity.
187 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
190 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
196 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
198 struct agp_via_softc *sc = device_get_softc(dev);
200 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
203 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
208 agp_via_unbind_page(device_t dev, int offset)
210 struct agp_via_softc *sc = device_get_softc(dev);
212 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
215 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
220 agp_via_flush_tlb(device_t dev)
222 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
223 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
226 static device_method_t agp_via_methods[] = {
227 /* Device interface */
228 DEVMETHOD(device_probe, agp_via_probe),
229 DEVMETHOD(device_attach, agp_via_attach),
230 DEVMETHOD(device_detach, agp_via_detach),
231 DEVMETHOD(device_shutdown, bus_generic_shutdown),
232 DEVMETHOD(device_suspend, bus_generic_suspend),
233 DEVMETHOD(device_resume, bus_generic_resume),
236 DEVMETHOD(agp_get_aperture, agp_via_get_aperture),
237 DEVMETHOD(agp_set_aperture, agp_via_set_aperture),
238 DEVMETHOD(agp_bind_page, agp_via_bind_page),
239 DEVMETHOD(agp_unbind_page, agp_via_unbind_page),
240 DEVMETHOD(agp_flush_tlb, agp_via_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),
250 static driver_t agp_via_driver = {
253 sizeof(struct agp_via_softc),
256 static devclass_t agp_devclass;
258 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);