1/* $NetBSD: agp_ali.c,v 1.16 2010/11/13 13:52:04 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_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 1.16 2010/11/13 13:52:04 uebayasi 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
50struct agp_ali_softc {
51 u_int32_t initial_aperture; /* aperture size at startup */
52 struct agp_gatt *gatt;
53};
54
55static u_int32_t agp_ali_get_aperture(struct agp_softc *);
56static int agp_ali_set_aperture(struct agp_softc *sc, u_int32_t);
57static int agp_ali_bind_page(struct agp_softc *, off_t, bus_addr_t);
58static int agp_ali_unbind_page(struct agp_softc *, off_t);
59static void agp_ali_flush_tlb(struct agp_softc *);
60
61
62static 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
75int
76agp_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_NOWAIT);
85 if (asc == NULL) {
86 aprint_error(": failed to allocate softc\n");
87 return ENOMEM;
88 }
89 sc->as_chipc = asc;
90 sc->as_methods = &agp_ali_methods;
91
92 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
93 aprint_error(": failed to map aperture\n");
94 free(asc, M_AGP);
95 return ENXIO;
96 }
97
98 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
99 NULL);
100
101 asc->initial_aperture = agp_ali_get_aperture(sc);
102
103 for (;;) {
104 gatt = agp_alloc_gatt(sc);
105 if (gatt != NULL)
106 break;
107
108 /*
109 * Probably contigmalloc failure. Try reducing the
110 * aperture so that the gatt size reduces.
111 */
112 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
113 agp_generic_detach(sc);
114 aprint_error(": failed to set aperture\n");
115 return ENOMEM;
116 }
117 }
118 asc->gatt = gatt;
119
120 /* Install the gatt. */
121 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE);
122 reg = (reg & 0xfff) | (gatt->ag_physical & ~0xfff);
123 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE, reg);
124
125 /* Enable the TLB. */
126 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL);
127 reg = (reg & ~0xff) | 0x10;
128 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL, reg);
129
130 return 0;
131}
132
133#if 0
134static int
135agp_ali_detach(struct agp_softc *sc)
136{
137 int error;
138 pcireg_t reg;
139 struct agp_ali_softc *asc = sc->as_chipc;
140
141 error = agp_generic_detach(sc);
142 if (error)
143 return error;
144
145 /* Disable the TLB.. */
146 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
147 reg &= ~0xff;
148 reg |= 0x90;
149 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
150
151 /* Put the aperture back the way it started. */
152 AGP_SET_APERTURE(sc, asc->initial_aperture);
153 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
154 reg &= 0xf;
155 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);
156
157 agp_free_gatt(sc, asc->gatt);
158 return 0;
159}
160#endif
161
162#define M 1024*1024
163
164static const u_int32_t agp_ali_table[] = {
165 0, /* 0 - invalid */
166 1, /* 1 - invalid */
167 2, /* 2 - invalid */
168 4*M, /* 3 */
169 8*M, /* 4 */
170 0, /* 5 - Reserved */
171 16*M, /* 6 */
172 32*M, /* 7 */
173 64*M, /* 8 */
174 128*M, /* 9 */
175 256*M, /* 10 */
176};
177#define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
178
179static u_int32_t
180agp_ali_get_aperture(struct agp_softc *sc)
181{
182 int i;
183
184 /*
185 * The aperture size is derived from the low bits of attbase.
186 * I'm not sure this is correct..
187 */
188 i = (int)pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE) & 0xf;
189 if (i >= agp_ali_table_size)
190 return 0;
191 return agp_ali_table[i];
192}
193
194static int
195agp_ali_set_aperture(struct agp_softc *sc, u_int32_t aperture)
196{
197 int i;
198 pcireg_t reg;
199
200 if (aperture & (aperture - 1) || aperture < 1*M)
201 return EINVAL;
202
203 for (i = 0; i < agp_ali_table_size; i++)
204 if (agp_ali_table[i] == aperture)
205 break;
206 if (i == agp_ali_table_size)
207 return EINVAL;
208
209 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
210 reg &= ~0xf;
211 reg |= i;
212 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);
213 return 0;
214}
215
216static int
217agp_ali_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
218{
219 struct agp_ali_softc *asc = sc->as_chipc;
220
221 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
222 return EINVAL;
223
224 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
225 return 0;
226}
227
228static int
229agp_ali_unbind_page(struct agp_softc *sc, off_t offset)
230{
231 struct agp_ali_softc *asc = sc->as_chipc;
232
233 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
234 return EINVAL;
235
236 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
237 return 0;
238}
239
240static void
241agp_ali_flush_tlb(struct agp_softc *sc)
242{
243 pcireg_t reg;
244
245 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
246 reg &= ~0xff;
247 reg |= 0x90;
248 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
249 reg &= ~0xff;
250 reg |= 0x10;
251 pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
252}
253