1 /* $NetBSD: agp_ali.c,v 1.17 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_ali.c,v 1.3 2001/07/05 21:28:46 jhb Exp $
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: agp_ali.c,v 1.17 2019/11/10 21:16:36 chs Exp $");
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/systm.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_ali_softc {
51 u_int32_t initial_aperture; /* aperture size at startup */
52 struct agp_gatt *gatt;
53 };
54
55 static u_int32_t agp_ali_get_aperture(struct agp_softc *);
56 static int agp_ali_set_aperture(struct agp_softc *sc, u_int32_t);
57 static int agp_ali_bind_page(struct agp_softc *, off_t, bus_addr_t);
58 static int agp_ali_unbind_page(struct agp_softc *, off_t);
59 static void agp_ali_flush_tlb(struct agp_softc *);
60
61
62 static struct agp_methods agp_ali_methods = {
63 agp_ali_get_aperture,
64 agp_ali_set_aperture,
65 agp_ali_bind_page,
66 agp_ali_unbind_page,
67 agp_ali_flush_tlb,
68 agp_generic_enable,
69 agp_generic_alloc_memory,
70 agp_generic_free_memory,
71 agp_generic_bind_memory,
72 agp_generic_unbind_memory,
73 };
74
75 int
agp_ali_attach(device_t parent,device_t self,void * aux)76 agp_ali_attach(device_t parent, device_t self, void *aux)
77 {
78 struct agp_softc *sc = device_private(self);
79 struct agp_ali_softc *asc;
80 struct pci_attach_args *pa = aux;
81 struct agp_gatt *gatt;
82 pcireg_t reg;
83
84 asc = malloc(sizeof *asc, M_AGP, M_WAITOK);
85 sc->as_chipc = asc;
86 sc->as_methods = &agp_ali_methods;
87
88 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
89 aprint_error(": failed to map aperture\n");
90 free(asc, M_AGP);
91 return ENXIO;
92 }
93
94 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
95 NULL);
96
97 asc->initial_aperture = agp_ali_get_aperture(sc);
98
99 for (;;) {
100 gatt = agp_alloc_gatt(sc);
101 if (gatt != NULL)
102 break;
103
104 /*
105 * Probably contigmalloc failure. Try reducing the
106 * aperture so that the gatt size reduces.
107 */
108 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
109 agp_generic_detach(sc);
110 aprint_error(": failed to set aperture\n");
111 return ENOMEM;
112 }
113 }
114 asc->gatt = gatt;
115
116 /* Install the gatt. */
117 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE);
118 reg = (reg & 0xfff) | (gatt->ag_physical & ~0xfff);
119 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE, reg);
120
121 /* Enable the TLB. */
122 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL);
123 reg = (reg & ~0xff) | 0x10;
124 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL, reg);
125
126 return 0;
127 }
128
129 #if 0
130 static int
131 agp_ali_detach(struct agp_softc *sc)
132 {
133 int error;
134 pcireg_t reg;
135 struct agp_ali_softc *asc = sc->as_chipc;
136
137 error = agp_generic_detach(sc);
138 if (error)
139 return error;
140
141 /* Disable the TLB.. */
142 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
143 reg &= ~0xff;
144 reg |= 0x90;
145 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
146
147 /* Put the aperture back the way it started. */
148 AGP_SET_APERTURE(sc, asc->initial_aperture);
149 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
150 reg &= 0xf;
151 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);
152
153 agp_free_gatt(sc, asc->gatt);
154 return 0;
155 }
156 #endif
157
158 #define M 1024*1024
159
160 static const u_int32_t agp_ali_table[] = {
161 0, /* 0 - invalid */
162 1, /* 1 - invalid */
163 2, /* 2 - invalid */
164 4*M, /* 3 */
165 8*M, /* 4 */
166 0, /* 5 - Reserved */
167 16*M, /* 6 */
168 32*M, /* 7 */
169 64*M, /* 8 */
170 128*M, /* 9 */
171 256*M, /* 10 */
172 };
173 #define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
174
175 static u_int32_t
agp_ali_get_aperture(struct agp_softc * sc)176 agp_ali_get_aperture(struct agp_softc *sc)
177 {
178 int i;
179
180 /*
181 * The aperture size is derived from the low bits of attbase.
182 * I'm not sure this is correct..
183 */
184 i = (int)pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE) & 0xf;
185 if (i >= agp_ali_table_size)
186 return 0;
187 return agp_ali_table[i];
188 }
189
190 static int
agp_ali_set_aperture(struct agp_softc * sc,u_int32_t aperture)191 agp_ali_set_aperture(struct agp_softc *sc, u_int32_t aperture)
192 {
193 int i;
194 pcireg_t reg;
195
196 if (aperture & (aperture - 1) || aperture < 1*M)
197 return EINVAL;
198
199 for (i = 0; i < agp_ali_table_size; i++)
200 if (agp_ali_table[i] == aperture)
201 break;
202 if (i == agp_ali_table_size)
203 return EINVAL;
204
205 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
206 reg &= ~0xf;
207 reg |= i;
208 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);
209 return 0;
210 }
211
212 static int
agp_ali_bind_page(struct agp_softc * sc,off_t offset,bus_addr_t physical)213 agp_ali_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
214 {
215 struct agp_ali_softc *asc = sc->as_chipc;
216
217 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
218 return EINVAL;
219
220 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
221 return 0;
222 }
223
224 static int
agp_ali_unbind_page(struct agp_softc * sc,off_t offset)225 agp_ali_unbind_page(struct agp_softc *sc, off_t offset)
226 {
227 struct agp_ali_softc *asc = sc->as_chipc;
228
229 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
230 return EINVAL;
231
232 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
233 return 0;
234 }
235
236 static void
agp_ali_flush_tlb(struct agp_softc * sc)237 agp_ali_flush_tlb(struct agp_softc *sc)
238 {
239 pcireg_t reg;
240
241 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
242 reg &= ~0xff;
243 reg |= 0x90;
244 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
245 reg &= ~0xff;
246 reg |= 0x10;
247 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
248 }
249