agp_via.c revision 133406
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 133406 2004-08-09 21:01:49Z anholt $");
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/module.h>
37#include <sys/bus.h>
38#include <sys/lock.h>
39#include <sys/mutex.h>
40#include <sys/proc.h>
41
42#include <dev/pci/pcivar.h>
43#include <dev/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
51#define	REG_GARTCTRL	0
52#define	REG_APSIZE	1
53#define	REG_ATTBASE	2
54
55struct agp_via_softc {
56	struct agp_softc agp;
57	u_int32_t	initial_aperture; /* aperture size at startup */
58	struct agp_gatt *gatt;
59	int		*regs;
60};
61
62static int via_v2_regs[] = { AGP_VIA_GARTCTRL, AGP_VIA_APSIZE,
63    AGP_VIA_ATTBASE };
64static int via_v3_regs[] = { AGP3_VIA_GARTCTRL, AGP3_VIA_APSIZE,
65    AGP3_VIA_ATTBASE };
66
67static const char*
68agp_via_match(device_t dev)
69{
70	if (pci_get_class(dev) != PCIC_BRIDGE
71	    || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
72		return NULL;
73
74	if (agp_find_caps(dev) == 0)
75		return NULL;
76
77	switch (pci_get_devid(dev)) {
78	case 0x03051106:
79		return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
80	case 0x05011106:
81		return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
82	case 0x05971106:
83		return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
84	case 0x05981106:
85		return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
86	case 0x06051106:
87		return ("VIA 82C694X (Apollo Pro 133A) host to PCI bridge");
88	case 0x06911106:
89		return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
90	case 0x31881106:
91		return ("VIA 8385 host to PCI bridge");
92	case 0x31891106:
93		return ("VIA 8377 (Apollo KT400/KT400A/KT600) host to PCI bridge");
94	};
95
96	if (pci_get_vendor(dev) == 0x1106)
97		return ("VIA Generic host to PCI bridge");
98
99	return NULL;
100}
101
102static int
103agp_via_probe(device_t dev)
104{
105	const char *desc;
106
107	if (resource_disabled("agp", device_get_unit(dev)))
108		return (ENXIO);
109	desc = agp_via_match(dev);
110	if (desc) {
111		device_verbose(dev);
112		device_set_desc(dev, desc);
113		return 0;
114	}
115
116	return ENXIO;
117}
118
119static int
120agp_via_attach(device_t dev)
121{
122	struct agp_via_softc *sc = device_get_softc(dev);
123	struct agp_gatt *gatt;
124	int error;
125	u_int32_t agpsel;
126
127	switch (pci_get_devid(dev)) {
128	case 0x31881106:
129	case 0x31891106:
130		/* The newer VIA chipsets will select the AGP version based on
131		 * what AGP versions the card supports.  We still have to
132		 * program it using the v2 registers if it has chosen to use
133		 * compatibility mode.
134		 */
135		agpsel = pci_read_config(dev, AGP_VIA_AGPSEL, 1);
136		if ((agpsel & (1 << 1)) == 0)
137			sc->regs = via_v3_regs;
138		else
139			sc->regs = via_v2_regs;
140		break;
141	default:
142		sc->regs = via_v2_regs;
143		break;
144	}
145
146	error = agp_generic_attach(dev);
147	if (error)
148		return error;
149
150	sc->initial_aperture = AGP_GET_APERTURE(dev);
151
152	for (;;) {
153		gatt = agp_alloc_gatt(dev);
154		if (gatt)
155			break;
156
157		/*
158		 * Probably contigmalloc failure. Try reducing the
159		 * aperture so that the gatt size reduces.
160		 */
161		if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
162			agp_generic_detach(dev);
163			return ENOMEM;
164		}
165	}
166	sc->gatt = gatt;
167
168	/* Install the gatt. */
169	pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical | 3, 4);
170
171	/* Enable the aperture. */
172	pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4);
173
174	return 0;
175}
176
177static int
178agp_via_detach(device_t dev)
179{
180	struct agp_via_softc *sc = device_get_softc(dev);
181	int error;
182
183	error = agp_generic_detach(dev);
184	if (error)
185		return error;
186
187	pci_write_config(dev, sc->regs[REG_GARTCTRL], 0, 4);
188	pci_write_config(dev, sc->regs[REG_ATTBASE], 0, 4);
189	AGP_SET_APERTURE(dev, sc->initial_aperture);
190	agp_free_gatt(sc->gatt);
191
192	return 0;
193}
194
195static u_int32_t
196agp_via_get_aperture(device_t dev)
197{
198	struct agp_via_softc *sc = device_get_softc(dev);
199	u_int32_t apsize;
200
201	apsize = pci_read_config(dev, sc->regs[REG_APSIZE], 1) & 0x1f;
202
203	/*
204	 * The size is determined by the number of low bits of
205	 * register APBASE which are forced to zero. The low 20 bits
206	 * are always forced to zero and each zero bit in the apsize
207	 * field just read forces the corresponding bit in the 27:20
208	 * to be zero. We calculate the aperture size accordingly.
209	 */
210	return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
211}
212
213static int
214agp_via_set_aperture(device_t dev, u_int32_t aperture)
215{
216	struct agp_via_softc *sc = device_get_softc(dev);
217	u_int32_t apsize;
218
219	/*
220	 * Reverse the magic from get_aperture.
221	 */
222	apsize = ((aperture - 1) >> 20) ^ 0xff;
223
224	/*
225	 * Double check for sanity.
226	 */
227	if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
228		return EINVAL;
229
230	pci_write_config(dev, sc->regs[REG_APSIZE], apsize, 1);
231
232	return 0;
233}
234
235static int
236agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
237{
238	struct agp_via_softc *sc = device_get_softc(dev);
239
240	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
241		return EINVAL;
242
243	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
244	return 0;
245}
246
247static int
248agp_via_unbind_page(device_t dev, int offset)
249{
250	struct agp_via_softc *sc = device_get_softc(dev);
251
252	if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
253		return EINVAL;
254
255	sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
256	return 0;
257}
258
259static void
260agp_via_flush_tlb(device_t dev)
261{
262	struct agp_via_softc *sc = device_get_softc(dev);
263
264	pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x8f, 4);
265	pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4);
266}
267
268static device_method_t agp_via_methods[] = {
269	/* Device interface */
270	DEVMETHOD(device_probe,		agp_via_probe),
271	DEVMETHOD(device_attach,	agp_via_attach),
272	DEVMETHOD(device_detach,	agp_via_detach),
273	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
274	DEVMETHOD(device_suspend,	bus_generic_suspend),
275	DEVMETHOD(device_resume,	bus_generic_resume),
276
277	/* AGP interface */
278	DEVMETHOD(agp_get_aperture,	agp_via_get_aperture),
279	DEVMETHOD(agp_set_aperture,	agp_via_set_aperture),
280	DEVMETHOD(agp_bind_page,	agp_via_bind_page),
281	DEVMETHOD(agp_unbind_page,	agp_via_unbind_page),
282	DEVMETHOD(agp_flush_tlb,	agp_via_flush_tlb),
283	DEVMETHOD(agp_enable,		agp_generic_enable),
284	DEVMETHOD(agp_alloc_memory,	agp_generic_alloc_memory),
285	DEVMETHOD(agp_free_memory,	agp_generic_free_memory),
286	DEVMETHOD(agp_bind_memory,	agp_generic_bind_memory),
287	DEVMETHOD(agp_unbind_memory,	agp_generic_unbind_memory),
288
289	{ 0, 0 }
290};
291
292static driver_t agp_via_driver = {
293	"agp",
294	agp_via_methods,
295	sizeof(struct agp_via_softc),
296};
297
298static devclass_t agp_devclass;
299
300DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
301MODULE_DEPEND(agp_via, agp, 1, 1, 1);
302MODULE_DEPEND(agp_via, pci, 1, 1, 1);
303