Annotation of sys/dev/pci/agp_sis.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: agp_sis.c,v 1.3 2007/08/04 19:40:25 reyk Exp $ */
2: /* $NetBSD: agp_sis.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_sis.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: struct agp_sis_softc {
52: u_int32_t initial_aperture; /* aperture size at startup */
53: struct agp_gatt *gatt;
54: };
55:
56: static u_int32_t agp_sis_get_aperture(struct vga_pci_softc *);
57: static int agp_sis_set_aperture(struct vga_pci_softc *, u_int32_t);
58: static int agp_sis_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
59: static int agp_sis_unbind_page(struct vga_pci_softc *, off_t);
60: static void agp_sis_flush_tlb(struct vga_pci_softc *);
61:
62: struct agp_methods agp_sis_methods = {
63: agp_sis_get_aperture,
64: agp_sis_set_aperture,
65: agp_sis_bind_page,
66: agp_sis_unbind_page,
67: agp_sis_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:
76: int
77: agp_sis_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
78: struct pci_attach_args *pchb_pa)
79: {
80: struct agp_sis_softc *ssc;
81: struct agp_gatt *gatt;
82: pcireg_t reg;
83:
84: ssc = malloc(sizeof *ssc, M_DEVBUF, M_NOWAIT);
85: if (ssc == NULL) {
86: printf(": can't allocate chipset-specific softc\n");
87: return (ENOMEM);
88: }
89: sc->sc_methods = &agp_sis_methods;
90: sc->sc_chipc = ssc;
91:
92: if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
93: printf(": can't map aperture\n");
94: free(ssc, M_DEVBUF);
95: return (ENXIO);
96: }
97:
98: ssc->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(": failed to set aperture\n");
112: return (ENOMEM);
113: }
114: }
115: ssc->gatt = gatt;
116:
117: /* Install the gatt. */
118: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_ATTBASE,
119: gatt->ag_physical);
120:
121: /* Enable the aperture and auto-tlb-inval */
122: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
123: reg |= (0x05 << 24) | 3;
124: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
125:
126: return (0);
127: }
128:
129: #if 0
130: static int
131: agp_sis_detach(struct vga_pci_softc *sc)
132: {
133: struct agp_sis_softc *ssc = sc->sc_chipc;
134: pcireg_t reg;
135: int error;
136:
137: error = agp_generic_detach(sc);
138: if (error)
139: return (error);
140:
141: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
142: reg &= ~3;
143: reg &= 0x00ffffff;
144: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
145:
146: /* Put the aperture back the way it started. */
147: AGP_SET_APERTURE(sc, ssc->initial_aperture);
148:
149: agp_free_gatt(sc, ssc->gatt);
150: return (0);
151: }
152: #endif
153:
154: static u_int32_t
155: agp_sis_get_aperture(struct vga_pci_softc *sc)
156: {
157: int gws;
158:
159: /*
160: * The aperture size is equal to 4M<<gws.
161: */
162: gws = (pci_conf_read(sc->sc_pc, sc->sc_pcitag,
163: AGP_SIS_WINCTRL)&0x70) >> 4;
164: return ((4 * 1024 * 1024) << gws);
165: }
166:
167: static int
168: agp_sis_set_aperture(struct vga_pci_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->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
185: reg &= ~0x00000070;
186: reg |= gws << 4;
187: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
188:
189: return (0);
190: }
191:
192: static int
193: agp_sis_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
194: {
195: struct agp_sis_softc *ssc = sc->sc_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:
204: static int
205: agp_sis_unbind_page(struct vga_pci_softc *sc, off_t offset)
206: {
207: struct agp_sis_softc *ssc = sc->sc_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:
216: static void
217: agp_sis_flush_tlb(struct vga_pci_softc *sc)
218: {
219: pcireg_t reg;
220:
221: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_TLBFLUSH);
222: reg &= 0xffffff00;
223: reg |= 0x02;
224: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_TLBFLUSH, reg);
225: }
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