Annotation of sys/dev/pci/agp_via.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: agp_via.c,v 1.3 2007/08/04 19:40:25 reyk Exp $ */
2: /* $NetBSD: agp_via.c,v 1.2 2001/09/15 00:25:00 thorpej Exp $ */
3:
4: /*-
5: * Copyright (c) 2000 Doug Rabson
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: *
29: * $FreeBSD: src/sys/pci/agp_via.c,v 1.3 2001/07/05 21:28:47 jhb Exp $
30: */
31:
32:
33: #include <sys/param.h>
34: #include <sys/systm.h>
35: #include <sys/malloc.h>
36: #include <sys/kernel.h>
37: #include <sys/lock.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/vga_pcivar.h>
46: #include <dev/pci/agpvar.h>
47: #include <dev/pci/agpreg.h>
48:
49: #include <machine/bus.h>
50:
51: static u_int32_t agp_via_get_aperture(struct vga_pci_softc *);
52: static int agp_via_set_aperture(struct vga_pci_softc *, u_int32_t);
53: static int agp_via_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
54: static int agp_via_unbind_page(struct vga_pci_softc *, off_t);
55: static void agp_via_flush_tlb(struct vga_pci_softc *);
56:
57: struct agp_methods agp_via_methods = {
58: agp_via_get_aperture,
59: agp_via_set_aperture,
60: agp_via_bind_page,
61: agp_via_unbind_page,
62: agp_via_flush_tlb,
63: agp_generic_enable,
64: agp_generic_alloc_memory,
65: agp_generic_free_memory,
66: agp_generic_bind_memory,
67: agp_generic_unbind_memory,
68: };
69:
70: struct agp_via_softc {
71: u_int32_t initial_aperture; /* aperture size at startup */
72: struct agp_gatt *gatt;
73: };
74:
75:
76: int
77: agp_via_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
78: struct pci_attach_args *pchb_pa)
79: {
80: struct agp_via_softc *asc;
81: struct agp_gatt *gatt;
82:
83: asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT);
84: if (asc == NULL) {
85: printf(": can't allocate chipset-specific softc\n");
86: return (ENOMEM);
87: }
88: memset(asc, 0, sizeof *asc);
89: sc->sc_chipc = asc;
90: sc->sc_methods = &agp_via_methods;
91:
92: if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
93: printf(": can't map aperture\n");
94: free(asc, M_DEVBUF);
95: return (ENXIO);
96: }
97:
98: asc->initial_aperture = AGP_GET_APERTURE(sc);
99:
100: for (;;) {
101: gatt = agp_alloc_gatt(sc);
102: if (gatt)
103: break;
104:
105: /*
106: * Probably contigmalloc failure. Try reducing the
107: * aperture so that the gatt size reduces.
108: */
109: if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
110: agp_generic_detach(sc);
111: printf(": can't set aperture size\n");
112: return (ENOMEM);
113: }
114: }
115: asc->gatt = gatt;
116:
117: /* Install the gatt. */
118: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE,
119: gatt->ag_physical | 3);
120:
121: /* Enable the aperture. */
122: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0000000f);
123:
124: return (0);
125: }
126:
127: #if 0
128: static int
129: agp_via_detach(struct vga_pci_softc *sc)
130: {
131: struct agp_via_softc *asc = sc->sc_chipc;
132: int error;
133:
134: error = agp_generic_detach(sc);
135: if (error)
136: return (error);
137:
138: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0);
139: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE, 0);
140: AGP_SET_APERTURE(sc, asc->initial_aperture);
141: agp_free_gatt(sc, asc->gatt);
142:
143: return (0);
144: }
145: #endif
146:
147: static u_int32_t
148: agp_via_get_aperture(struct vga_pci_softc *sc)
149: {
150: u_int32_t apsize;
151:
152: apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag,
153: AGP_VIA_APSIZE) & 0x1f;
154:
155: /*
156: * The size is determined by the number of low bits of
157: * register APBASE which are forced to zero. The low 20 bits
158: * are always forced to zero and each zero bit in the apsize
159: * field just read forces the corresponding bit in the 27:20
160: * to be zero. We calculate the aperture size accordingly.
161: */
162: return ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1);
163: }
164:
165: static int
166: agp_via_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
167: {
168: u_int32_t apsize;
169: pcireg_t reg;
170:
171: /*
172: * Reverse the magic from get_aperture.
173: */
174: apsize = ((aperture - 1) >> 20) ^ 0xff;
175:
176: /*
177: * Double check for sanity.
178: */
179: if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
180: return (EINVAL);
181:
182: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE);
183: reg &= ~0xff;
184: reg |= apsize;
185: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE, reg);
186:
187: return (0);
188: }
189:
190: static int
191: agp_via_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
192: {
193: struct agp_via_softc *asc = sc->sc_chipc;
194:
195: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
196: return (EINVAL);
197:
198: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
199: return (0);
200: }
201:
202: static int
203: agp_via_unbind_page(struct vga_pci_softc *sc, off_t offset)
204: {
205: struct agp_via_softc *asc = sc->sc_chipc;
206:
207: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
208: return (EINVAL);
209:
210: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
211: return (0);
212: }
213:
214: static void
215: agp_via_flush_tlb(struct vga_pci_softc *sc)
216: {
217: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x8f);
218: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0f);
219: }
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