agp_via.c revision 79339 
122347Spst/*-
222347Spst * Copyright (c) 2000 Doug Rabson
322347Spst * All rights reserved.
422347Spst *
522347Spst * Redistribution and use in source and binary forms, with or without
622347Spst * modification, are permitted provided that the following conditions
722347Spst * are met:
822347Spst * 1. Redistributions of source code must retain the above copyright
922347Spst *    notice, this list of conditions and the following disclaimer.
1022347Spst * 2. Redistributions in binary form must reproduce the above copyright
1122347Spst *    notice, this list of conditions and the following disclaimer in the
1222347Spst *    documentation and/or other materials provided with the distribution.
1322347Spst *
1422347Spst * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1522347Spst * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1622347Spst * 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: head/sys/dev/agp/agp_via.c 79339 2001-07-05 21:28:47Z jhb $
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#include <sys/mutex.h>
39#include <sys/proc.h>
40
41#include <pci/pcivar.h>
42#include <pci/pcireg.h>
43#include <pci/agppriv.h>
44#include <pci/agpreg.h>
45
46#include <vm/vm.h>
47#include <vm/vm_object.h>
48#include <vm/pmap.h>
49
50struct agp_via_softc {
51	struct agp_softc agp;
52	u_int32_t	initial_aperture; /* aperture size at startup */
53	struct agp_gatt *gatt;
54};
55
56static const char*
57agp_via_match(device_t dev)
58{
59	if (pci_get_class(dev) != PCIC_BRIDGE
60	    || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
61		return NULL;
62
63	if (agp_find_caps(dev) == 0)
64		return NULL;
65
66	switch (pci_get_devid(dev)) {
67	case 0x05011106:
68		return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
69	case 0x05971106:
70		return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
71	case 0x05981106:
72		return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
73	case 0x06911106:
74		return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
75	};
76
77	if (pci_get_vendor(dev) == 0x1106)
78		return ("VIA Generic host to PCI bridge");
79
80	return NULL;
81}
82
83static int
84agp_via_probe(device_t dev)
85{
86	const char *desc;
87
88	desc = agp_via_match(dev);
89	if (desc) {
90		device_verbose(dev);
91		device_set_desc(dev, desc);
92		return 0;
93	}
94
95	return ENXIO;
96}
97
98static int
99agp_via_attach(device_t dev)
100{
101	struct agp_via_softc *sc = device_get_softc(dev);
102	struct agp_gatt *gatt;
103	int error;
104
105	error = agp_generic_attach(dev);
106	if (error)
107		return error;
108
109	sc->initial_aperture = AGP_GET_APERTURE(dev);
110
111	for (;;) {
112		gatt = agp_alloc_gatt(dev);
113		if (gatt)
114			break;
115
116		/*
117		 * Probably contigmalloc failure. Try reducing the
118		 * aperture so that the gatt size reduces.
119		 */
120		if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
121			agp_generic_detach(dev);
122			return ENOMEM;
123		}
124	}
125	sc->gatt = gatt;
126
127	/* Install the gatt. */
128	pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
129
130	/* Enable the aperture. */
131	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
132
133	return 0;
134}
135
136static int
137agp_via_detach(device_t dev)
138{
139	struct agp_via_softc *sc = device_get_softc(dev);
140	int error;
141
142	error = agp_generic_detach(dev);
143	if (error)
144		return error;
145
146	pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
147	pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
148	AGP_SET_APERTURE(dev, sc->initial_aperture);
149	agp_free_gatt(sc->gatt);
150
151	return 0;
152}
153
154static u_int32_t
155agp_via_get_aperture(device_t dev)
156{
157	u_int32_t apsize;
158
159	apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
160
161	/*
162	 * The size is determined by the number of low bits of
163	 * register APBASE which are forced to zero. The low 20 bits
164	 * are always forced to zero and each zero bit in the apsize
165	 * field just read forces the corresponding bit in the 27:20
166	 * to be zero. We calculate the aperture size accordingly.
167	 */
168	return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
169}
170
171static int
172agp_via_set_aperture(device_t dev, u_int32_t aperture)
173{
174	u_int32_t apsize;
175
176	/*
177	 * Reverse the magic from get_aperture.
178	 */
179	apsize = ((aperture - 1) >> 20) ^ 0xff;
180
181	/*
182	 * Double check for sanity.
183	 */
184	if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
185		return EINVAL;
186
187	pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
188
189	return 0;
190}
191
192static int
193agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
194{
195	struct agp_via_softc *sc = device_get_softc(dev);
196
197	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
198		return EINVAL;
199
200	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
201	return 0;
202}
203
204static int
205agp_via_unbind_page(device_t dev, int offset)
206{
207	struct agp_via_softc *sc = device_get_softc(dev);
208
209	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
210		return EINVAL;
211
212	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
213	return 0;
214}
215
216static void
217agp_via_flush_tlb(device_t dev)
218{
219	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
220	pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
221}
222
223static device_method_t agp_via_methods[] = {
224	/* Device interface */
225	DEVMETHOD(device_probe,		agp_via_probe),
226	DEVMETHOD(device_attach,	agp_via_attach),
227	DEVMETHOD(device_detach,	agp_via_detach),
228	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
229	DEVMETHOD(device_suspend,	bus_generic_suspend),
230	DEVMETHOD(device_resume,	bus_generic_resume),
231
232	/* AGP interface */
233	DEVMETHOD(agp_get_aperture,	agp_via_get_aperture),
234	DEVMETHOD(agp_set_aperture,	agp_via_set_aperture),
235	DEVMETHOD(agp_bind_page,	agp_via_bind_page),
236	DEVMETHOD(agp_unbind_page,	agp_via_unbind_page),
237	DEVMETHOD(agp_flush_tlb,	agp_via_flush_tlb),
238	DEVMETHOD(agp_enable,		agp_generic_enable),
239	DEVMETHOD(agp_alloc_memory,	agp_generic_alloc_memory),
240	DEVMETHOD(agp_free_memory,	agp_generic_free_memory),
241	DEVMETHOD(agp_bind_memory,	agp_generic_bind_memory),
242	DEVMETHOD(agp_unbind_memory,	agp_generic_unbind_memory),
243
244	{ 0, 0 }
245};
246
247static driver_t agp_via_driver = {
248	"agp",
249	agp_via_methods,
250	sizeof(struct agp_via_softc),
251};
252
253static devclass_t agp_devclass;
254
255DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
256