Annotation of sys/dev/pci/agp_amd.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: agp_amd.c,v 1.3 2007/08/04 19:40:25 reyk Exp $ */
2: /* $NetBSD: agp_amd.c,v 1.6 2001/10/06 02:48:50 thorpej Exp $ */
3:
4:
5: /*-
6: * Copyright (c) 2000 Doug Rabson
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: *
30: * $FreeBSD: src/sys/pci/agp_amd.c,v 1.6 2001/07/05 21:28:46 jhb Exp $
31: */
32:
33:
34:
35: #include <sys/param.h>
36: #include <sys/systm.h>
37: #include <sys/malloc.h>
38: #include <sys/kernel.h>
39: #include <sys/lock.h>
40: #include <sys/proc.h>
41: #include <sys/conf.h>
42: #include <sys/device.h>
43: #include <sys/agpio.h>
44:
45: #include <dev/pci/pcivar.h>
46: #include <dev/pci/pcireg.h>
47: #include <dev/pci/vga_pcivar.h>
48: #include <dev/pci/agpvar.h>
49: #include <dev/pci/agpreg.h>
50:
51: #include <dev/pci/pcidevs.h>
52:
53: #define READ2(off) bus_space_read_2(asc->iot, asc->ioh, off)
54: #define READ4(off) bus_space_read_4(asc->iot, asc->ioh, off)
55: #define WRITE2(off,v) bus_space_write_2(asc->iot, asc->ioh, off, v)
56: #define WRITE4(off,v) bus_space_write_4(asc->iot, asc->ioh, off, v)
57:
58: struct agp_amd_gatt {
59: bus_dmamap_t ag_dmamap;
60: bus_dma_segment_t ag_dmaseg;
61: int ag_nseg;
62: u_int32_t ag_entries;
63: u_int32_t *ag_vdir; /* virtual address of page dir */
64: bus_addr_t ag_pdir; /* bus address of page dir */
65: u_int32_t *ag_virtual; /* virtual address of gatt */
66: bus_addr_t ag_physical; /* bus address of gatt */
67: size_t ag_size;
68: };
69:
70: struct agp_amd_softc {
71: u_int32_t initial_aperture; /* aperture size at startup */
72: struct agp_amd_gatt *gatt;
73: bus_space_handle_t ioh;
74: bus_space_tag_t iot;
75: };
76:
77: static u_int32_t agp_amd_get_aperture(struct vga_pci_softc *);
78: static int agp_amd_set_aperture(struct vga_pci_softc *, u_int32_t);
79: static int agp_amd_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
80: static int agp_amd_unbind_page(struct vga_pci_softc *, off_t);
81: static void agp_amd_flush_tlb(struct vga_pci_softc *);
82:
83:
84: struct agp_methods agp_amd_methods = {
85: agp_amd_get_aperture,
86: agp_amd_set_aperture,
87: agp_amd_bind_page,
88: agp_amd_unbind_page,
89: agp_amd_flush_tlb,
90: agp_generic_enable,
91: agp_generic_alloc_memory,
92: agp_generic_free_memory,
93: agp_generic_bind_memory,
94: agp_generic_unbind_memory,
95: };
96:
97:
98: static struct agp_amd_gatt *
99: agp_amd_alloc_gatt(struct vga_pci_softc *sc)
100: {
101: u_int32_t apsize = AGP_GET_APERTURE(sc);
102: u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
103: struct agp_amd_gatt *gatt;
104: int i, npages;
105: caddr_t vdir;
106:
107: gatt = malloc(sizeof(struct agp_amd_gatt), M_DEVBUF, M_NOWAIT);
108: if (!gatt)
109: return (0);
110:
111: if (agp_alloc_dmamem(sc->sc_dmat,
112: AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0,
113: &gatt->ag_dmamap, &vdir, &gatt->ag_pdir,
114: &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) {
115: printf("failed to allocate GATT\n");
116: free(gatt, M_DEVBUF);
117: return (NULL);
118: }
119:
120: gatt->ag_vdir = (u_int32_t *)vdir;
121: gatt->ag_entries = entries;
122: gatt->ag_virtual = (u_int32_t *)(vdir + AGP_PAGE_SIZE);
123: gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE;
124: gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t);
125:
126: memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE);
127: memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t));
128:
129: /*
130: * Map the pages of the GATT into the page directory.
131: */
132: npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
133: >> AGP_PAGE_SHIFT);
134:
135: for (i = 0; i < npages; i++)
136: gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1;
137:
138: /*
139: * Make sure the chipset can see everything.
140: */
141: agp_flush_cache();
142:
143: return (gatt);
144: }
145:
146: #if 0
147: static void
148: agp_amd_free_gatt(struct vga_pci_softc *sc, struct agp_amd_gatt *gatt)
149: {
150: agp_free_dmamem(sc->sc_dmat, gatt->ag_size,
151: gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg,
152: gatt->ag_nseg);
153: free(gatt, M_DEVBUF);
154: }
155: #endif
156:
157: int
158: agp_amd_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, struct pci_attach_args *pchb_pa)
159: {
160: struct agp_amd_softc *asc;
161: struct agp_amd_gatt *gatt;
162: pcireg_t reg;
163: int error;
164:
165: asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT);
166: if (asc == NULL) {
167: printf(": can't allocate softc\n");
168: /* agp_generic_detach(sc) */
169: return (ENOMEM);
170: }
171: memset(asc, 0, sizeof *asc);
172:
173: error = pci_mapreg_map(pchb_pa, AGP_AMD751_REGISTERS,
174: PCI_MAPREG_TYPE_MEM,0, &asc->iot, &asc->ioh, NULL, NULL, 0);
175: if (error != 0) {
176: printf(": can't map AGP registers\n");
177: agp_generic_detach(sc);
178: return (error);
179: }
180:
181: if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
182: printf(": can't map aperture\n");
183: agp_generic_detach(sc);
184: free(asc, M_DEVBUF);
185: return (ENXIO);
186: }
187: sc->sc_methods = &agp_amd_methods;
188: sc->sc_chipc = asc;
189: asc->initial_aperture = AGP_GET_APERTURE(sc);
190:
191: for (;;) {
192: gatt = agp_amd_alloc_gatt(sc);
193: if (gatt)
194: break;
195:
196: /*
197: * Probably contigmalloc failure. Try reducing the
198: * aperture so that the gatt size reduces.
199: */
200: if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
201: printf(": can't set aperture\n");
202: return (ENOMEM);
203: }
204: }
205: asc->gatt = gatt;
206:
207: /* Install the gatt. */
208: WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical);
209:
210: /* Enable synchronisation between host and agp. */
211: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL);
212: reg &= ~0x00ff00ff;
213: reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16);
214: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL, reg);
215: /* Enable the TLB and flush */
216: WRITE2(AGP_AMD751_STATUS,
217: READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
218: AGP_FLUSH_TLB(sc);
219:
220: return (0);
221: }
222:
223: #if 0
224: static int
225: agp_amd_detach(struct vga_pci_softc *sc)
226: {
227: pcireg_t reg;
228: struct agp_amd_softc *asc = sc->sc_chipc;
229:
230: /* Disable the TLB.. */
231: WRITE2(AGP_AMD751_STATUS,
232: READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
233:
234: /* Disable host-agp sync */
235: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL);
236: reg &= 0xffffff00;
237: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL, reg);
238:
239: /* Clear the GATT base */
240: WRITE4(AGP_AMD751_ATTBASE, 0);
241:
242: /* Put the aperture back the way it started. */
243: AGP_SET_APERTURE(sc, asc->initial_aperture);
244:
245: agp_amd_free_gatt(sc, asc->gatt);
246:
247: /* XXXfvdl no pci_mapreg_unmap */
248:
249: return (0);
250: }
251: #endif
252:
253: static u_int32_t
254: agp_amd_get_aperture(struct vga_pci_softc *sc)
255: {
256: int vas;
257:
258: vas = (pci_conf_read(sc->sc_pc, sc->sc_pcitag,
259: AGP_AMD751_APCTRL) & 0x06);
260: vas >>= 1;
261: /*
262: * The aperture size is equal to 32M<<vas.
263: */
264: return ((32 * 1024 * 1024) << vas);
265: }
266:
267: static int
268: agp_amd_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
269: {
270: int vas;
271: pcireg_t reg;
272:
273: /*
274: * Check for a power of two and make sure its within the
275: * programmable range.
276: */
277: if (aperture & (aperture - 1)
278: || aperture < 32*1024*1024
279: || aperture > 2U*1024*1024*1024)
280: return (EINVAL);
281:
282: vas = ffs(aperture / 32*1024*1024) - 1;
283:
284: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_APCTRL);
285: reg = (reg & ~0x06) | (vas << 1);
286: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_APCTRL, reg);
287:
288: return (0);
289: }
290:
291: static int
292: agp_amd_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
293: {
294: struct agp_amd_softc *asc = sc->sc_chipc;
295:
296: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
297: return (EINVAL);
298:
299: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
300: return (0);
301: }
302:
303: static int
304: agp_amd_unbind_page(struct vga_pci_softc *sc, off_t offset)
305: {
306: struct agp_amd_softc *asc = sc->sc_chipc;
307:
308: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
309: return (EINVAL);
310:
311: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
312: return (0);
313: }
314:
315: static void
316: agp_amd_flush_tlb(struct vga_pci_softc *sc)
317: {
318: struct agp_amd_softc *asc = sc->sc_chipc;
319:
320: /* Set the cache invalidate bit and wait for the chipset to clear */
321: WRITE4(AGP_AMD751_TLBCTRL, 1);
322: do {
323: DELAY(1);
324: } while (READ4(AGP_AMD751_TLBCTRL));
325: }
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