agp_via.c revision 116192 
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/agp/agp_via.c 116192 2003-06-11 06:34:30Z obrien $");
29
30#include "opt_bus.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#include <sys/lockmgr.h>
39#include <sys/mutex.h>
40#include <sys/proc.h>
41
42#include <pci/pcivar.h>
43#include <pci/pcireg.h>
44#include <pci/agppriv.h>
45#include <pci/agpreg.h>
46
47#include <vm/vm.h>
48#include <vm/vm_object.h>
49#include <vm/pmap.h>
50
51struct agp_via_softc {
52	struct agp_softc agp;
53	u_int32_t	initial_aperture; /* aperture size at startup */
54	struct agp_gatt *gatt;
55};
56
57static const char*
58agp_via_match(device_t dev)
59{
60	if (pci_get_class(dev) != PCIC_BRIDGE
61	    || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
62		return NULL;
63
64	if (agp_find_caps(dev) == 0)
65		return NULL;
66
67	switch (pci_get_devid(dev)) {
68	case 0x05011106:
69		return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
70	case 0x05971106:
71		return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
72	case 0x05981106:
73		return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
74	case 0x06911106:
75		return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
76	case 0x03051106:
77	    return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
78	};
79
80	if (pci_get_vendor(dev) == 0x1106)
81		return ("VIA Generic host to PCI bridge");
82
83	return NULL;
84}
85
86static int
87agp_via_probe(device_t dev)
88{
89	const char *desc;
90
91	desc = agp_via_match(dev);
92	if (desc) {
93		device_verbose(dev);
94		device_set_desc(dev, desc);
95		return 0;
96	}
97
98	return ENXIO;
99}
100
101static int
102agp_via_attach(device_t dev)
103{
104	struct agp_via_softc *sc = device_get_softc(dev);
105	struct agp_gatt *gatt;
106	int error;
107
108	error = agp_generic_attach(dev);
109	if (error)
110		return error;
111
112	sc->initial_aperture = AGP_GET_APERTURE(dev);
113
114	for (;;) {
115		gatt = agp_alloc_gatt(dev);
116		if (gatt)
117			break;
118
119		/*
120		 * Probably contigmalloc failure. Try reducing the
121		 * aperture so that the gatt size reduces.
122		 */
123		if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
124			agp_generic_detach(dev);
125			return ENOMEM;
126		}
127	}
128	sc->gatt = gatt;
129
130	/* Install the gatt. */
131	pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
132
133	/* Enable the aperture. */
134	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
135
136	return 0;
137}
138
139static int
140agp_via_detach(device_t dev)
141{
142	struct agp_via_softc *sc = device_get_softc(dev);
143	int error;
144
145	error = agp_generic_detach(dev);
146	if (error)
147		return error;
148
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);
153
154	return 0;
155}
156
157static u_int32_t
158agp_via_get_aperture(device_t dev)
159{
160	u_int32_t apsize;
161
162	apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
163
164	/*
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.
170	 */
171	return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
172}
173
174static int
175agp_via_set_aperture(device_t dev, u_int32_t aperture)
176{
177	u_int32_t apsize;
178
179	/*
180	 * Reverse the magic from get_aperture.
181	 */
182	apsize = ((aperture - 1) >> 20) ^ 0xff;
183
184	/*
185	 * Double check for sanity.
186	 */
187	if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
188		return EINVAL;
189
190	pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
191
192	return 0;
193}
194
195static int
196agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
197{
198	struct agp_via_softc *sc = device_get_softc(dev);
199
200	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
201		return EINVAL;
202
203	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
204	return 0;
205}
206
207static int
208agp_via_unbind_page(device_t dev, int offset)
209{
210	struct agp_via_softc *sc = device_get_softc(dev);
211
212	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
213		return EINVAL;
214
215	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
216	return 0;
217}
218
219static void
220agp_via_flush_tlb(device_t dev)
221{
222	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
223	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
224}
225
226static 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),
234
235	/* AGP interface */
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),
246
247	{ 0, 0 }
248};
249
250static driver_t agp_via_driver = {
251	"agp",
252	agp_via_methods,
253	sizeof(struct agp_via_softc),
254};
255
256static devclass_t agp_devclass;
257
258DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
259MODULE_DEPEND(agp_via, agp, 1, 1, 1);
260MODULE_DEPEND(agp_via, pci, 1, 1, 1);
261