1 /* $NetBSD: agp_sis.c,v 1.15 2019/11/10 21:16:36 chs 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 1.15 2019/11/10 21:16:36 chs 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
50 struct agp_sis_softc {
51 u_int32_t initial_aperture; /* aperture size at startup */
52 struct agp_gatt *gatt;
53 };
54
55 static u_int32_t agp_sis_get_aperture(struct agp_softc *);
56 static int agp_sis_set_aperture(struct agp_softc *, u_int32_t);
57 static int agp_sis_bind_page(struct agp_softc *, off_t, bus_addr_t);
58 static int agp_sis_unbind_page(struct agp_softc *, off_t);
59 static void agp_sis_flush_tlb(struct agp_softc *);
60
61 static 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
74 int
agp_sis_attach(device_t parent,device_t self,void * aux)75 agp_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_WAITOK);
84 sc->as_methods = &agp_sis_methods;
85 sc->as_chipc = ssc;
86 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
87 NULL);
88
89 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
90 aprint_error(": can't map aperture\n");
91 free(ssc, M_AGP);
92 return ENXIO;
93 }
94
95 ssc->initial_aperture = AGP_GET_APERTURE(sc);
96
97 for (;;) {
98 gatt = agp_alloc_gatt(sc);
99 if (gatt)
100 break;
101
102 /*
103 * Probably contigmalloc failure. Try reducing the
104 * aperture so that the gatt size reduces.
105 */
106 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
107 agp_generic_detach(sc);
108 aprint_error(": failed to set aperture\n");
109 return ENOMEM;
110 }
111 }
112 ssc->gatt = gatt;
113
114 /* Install the gatt. */
115 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_ATTBASE,
116 gatt->ag_physical);
117
118 /* Enable the aperture and auto-tlb-inval */
119 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
120 reg |= (0x05 << 24) | 3;
121 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
122
123 return 0;
124 }
125
126 #if 0
127 static int
128 agp_sis_detach(struct agp_softc *sc)
129 {
130 struct agp_sis_softc *ssc = sc->as_chipc;
131 pcireg_t reg;
132 int error;
133
134 error = agp_generic_detach(sc);
135 if (error)
136 return error;
137
138 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
139 reg &= ~3;
140 reg &= 0x00ffffff;
141 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
142
143 /* Put the aperture back the way it started. */
144 AGP_SET_APERTURE(sc, ssc->initial_aperture);
145
146 agp_free_gatt(sc, ssc->gatt);
147 return 0;
148 }
149 #endif
150
151 static u_int32_t
agp_sis_get_aperture(struct agp_softc * sc)152 agp_sis_get_aperture(struct agp_softc *sc)
153 {
154 int gws;
155
156 /*
157 * The aperture size is equal to 4M<<gws.
158 */
159 gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4;
160 return (4*1024*1024) << gws;
161 }
162
163 static int
agp_sis_set_aperture(struct agp_softc * sc,u_int32_t aperture)164 agp_sis_set_aperture(struct agp_softc *sc, u_int32_t aperture)
165 {
166 int gws;
167 pcireg_t reg;
168
169 /*
170 * Check for a power of two and make sure its within the
171 * programmable range.
172 */
173 if (aperture & (aperture - 1)
174 || aperture < 4*1024*1024
175 || aperture > 256*1024*1024)
176 return EINVAL;
177
178 gws = ffs(aperture / 4*1024*1024) - 1;
179
180 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
181 reg &= ~0x00000070;
182 reg |= gws << 4;
183 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
184
185 return 0;
186 }
187
188 static int
agp_sis_bind_page(struct agp_softc * sc,off_t offset,bus_addr_t physical)189 agp_sis_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
190 {
191 struct agp_sis_softc *ssc = sc->as_chipc;
192
193 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
194 return EINVAL;
195
196 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
197 return 0;
198 }
199
200 static int
agp_sis_unbind_page(struct agp_softc * sc,off_t offset)201 agp_sis_unbind_page(struct agp_softc *sc, off_t offset)
202 {
203 struct agp_sis_softc *ssc = sc->as_chipc;
204
205 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
206 return EINVAL;
207
208 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
209 return 0;
210 }
211
212 static void
agp_sis_flush_tlb(struct agp_softc * sc)213 agp_sis_flush_tlb(struct agp_softc *sc)
214 {
215 pcireg_t reg;
216
217 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH);
218 reg &= 0xffffff00;
219 reg |= 0x02;
220 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH, reg);
221 }
222