1/* $NetBSD: agp_sis.c,v 1.14 2010/11/13 13:52:05 uebayasi Exp $ */
2
3/*-
4 * Copyright (c) 2000 Doug Rabson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/pci/agp_sis.c,v 1.3 2001/07/05 21:28:47 jhb Exp $
29 */
30
31#include <sys/cdefs.h>
32__KERNEL_RCSID(0, "$NetBSD: agp_sis.c,v 1.14 2010/11/13 13:52:05 uebayasi Exp $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37#include <sys/kernel.h>
38#include <sys/proc.h>
39#include <sys/conf.h>
40#include <sys/device.h>
41#include <sys/agpio.h>
42
43#include <dev/pci/pcivar.h>
44#include <dev/pci/pcireg.h>
45#include <dev/pci/agpvar.h>
46#include <dev/pci/agpreg.h>
47
48#include <sys/bus.h>
49
50struct agp_sis_softc {
51 u_int32_t initial_aperture; /* aperture size at startup */
52 struct agp_gatt *gatt;
53};
54
55static u_int32_t agp_sis_get_aperture(struct agp_softc *);
56static int agp_sis_set_aperture(struct agp_softc *, u_int32_t);
57static int agp_sis_bind_page(struct agp_softc *, off_t, bus_addr_t);
58static int agp_sis_unbind_page(struct agp_softc *, off_t);
59static void agp_sis_flush_tlb(struct agp_softc *);
60
61static struct agp_methods agp_sis_methods = {
62 agp_sis_get_aperture,
63 agp_sis_set_aperture,
64 agp_sis_bind_page,
65 agp_sis_unbind_page,
66 agp_sis_flush_tlb,
67 agp_generic_enable,
68 agp_generic_alloc_memory,
69 agp_generic_free_memory,
70 agp_generic_bind_memory,
71 agp_generic_unbind_memory,
72};
73
74int
75agp_sis_attach(device_t parent, device_t self, void *aux)
76{
77 struct agp_softc *sc = device_private(self);
78 struct pci_attach_args *pa = aux;
79 struct agp_sis_softc *ssc;
80 struct agp_gatt *gatt;
81 pcireg_t reg;
82
83 ssc = malloc(sizeof *ssc, M_AGP, M_NOWAIT);
84 if (ssc == NULL) {
85 aprint_error(": can't allocate chipset-specific softc\n");
86 return ENOMEM;
87 }
88 sc->as_methods = &agp_sis_methods;
89 sc->as_chipc = ssc;
90 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
91 NULL);
92
93 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
94 aprint_error(": can't map aperture\n");
95 free(ssc, M_AGP);
96 return ENXIO;
97 }
98
99 ssc->initial_aperture = AGP_GET_APERTURE(sc);
100
101 for (;;) {
102 gatt = agp_alloc_gatt(sc);
103 if (gatt)
104 break;
105
106 /*
107 * Probably contigmalloc failure. Try reducing the
108 * aperture so that the gatt size reduces.
109 */
110 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
111 agp_generic_detach(sc);
112 aprint_error(": failed to set aperture\n");
113 return ENOMEM;
114 }
115 }
116 ssc->gatt = gatt;
117
118 /* Install the gatt. */
119 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_ATTBASE,
120 gatt->ag_physical);
121
122 /* Enable the aperture and auto-tlb-inval */
123 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
124 reg |= (0x05 << 24) | 3;
125 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
126
127 return 0;
128}
129
130#if 0
131static int
132agp_sis_detach(struct agp_softc *sc)
133{
134 struct agp_sis_softc *ssc = sc->as_chipc;
135 pcireg_t reg;
136 int error;
137
138 error = agp_generic_detach(sc);
139 if (error)
140 return error;
141
142 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
143 reg &= ~3;
144 reg &= 0x00ffffff;
145 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
146
147 /* Put the aperture back the way it started. */
148 AGP_SET_APERTURE(sc, ssc->initial_aperture);
149
150 agp_free_gatt(sc, ssc->gatt);
151 return 0;
152}
153#endif
154
155static u_int32_t
156agp_sis_get_aperture(struct agp_softc *sc)
157{
158 int gws;
159
160 /*
161 * The aperture size is equal to 4M<<gws.
162 */
163 gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4;
164 return (4*1024*1024) << gws;
165}
166
167static int
168agp_sis_set_aperture(struct agp_softc *sc, u_int32_t aperture)
169{
170 int gws;
171 pcireg_t reg;
172
173 /*
174 * Check for a power of two and make sure its within the
175 * programmable range.
176 */
177 if (aperture & (aperture - 1)
178 || aperture < 4*1024*1024
179 || aperture > 256*1024*1024)
180 return EINVAL;
181
182 gws = ffs(aperture / 4*1024*1024) - 1;
183
184 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
185 reg &= ~0x00000070;
186 reg |= gws << 4;
187 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
188
189 return 0;
190}
191
192static int
193agp_sis_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
194{
195 struct agp_sis_softc *ssc = sc->as_chipc;
196
197 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
198 return EINVAL;
199
200 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
201 return 0;
202}
203
204static int
205agp_sis_unbind_page(struct agp_softc *sc, off_t offset)
206{
207 struct agp_sis_softc *ssc = sc->as_chipc;
208
209 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
210 return EINVAL;
211
212 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
213 return 0;
214}
215
216static void
217agp_sis_flush_tlb(struct agp_softc *sc)
218{
219 pcireg_t reg;
220
221 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH);
222 reg &= 0xffffff00;
223 reg |= 0x02;
224 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH, reg);
225}
226