FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp_amd.c
1 /*-
2 * Copyright (c) 2000 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/10.4/sys/dev/agp/agp_amd.c 275406 2014-12-02 13:46:13Z tijl $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/bus.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38 #include <sys/proc.h>
39
40 #include <dev/agp/agppriv.h>
41 #include <dev/agp/agpreg.h>
42 #include <dev/pci/pcivar.h>
43 #include <dev/pci/pcireg.h>
44
45 #include <vm/vm.h>
46 #include <vm/vm_extern.h>
47 #include <vm/vm_kern.h>
48 #include <vm/vm_object.h>
49 #include <vm/pmap.h>
50 #include <machine/bus.h>
51 #include <machine/resource.h>
52 #include <sys/rman.h>
53
54 MALLOC_DECLARE(M_AGP);
55
56 #define READ2(off) bus_space_read_2(sc->bst, sc->bsh, off)
57 #define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off)
58 #define WRITE2(off,v) bus_space_write_2(sc->bst, sc->bsh, off, v)
59 #define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v)
60
61 struct agp_amd_gatt {
62 u_int32_t ag_entries;
63 u_int32_t *ag_virtual; /* virtual address of gatt */
64 vm_offset_t ag_physical;
65 u_int32_t *ag_vdir; /* virtual address of page dir */
66 vm_offset_t ag_pdir; /* physical address of page dir */
67 };
68
69 struct agp_amd_softc {
70 struct agp_softc agp;
71 struct resource *regs; /* memory mapped control registers */
72 bus_space_tag_t bst; /* bus_space tag */
73 bus_space_handle_t bsh; /* bus_space handle */
74 u_int32_t initial_aperture; /* aperture size at startup */
75 struct agp_amd_gatt *gatt;
76 };
77
78 static struct agp_amd_gatt *
79 agp_amd_alloc_gatt(device_t dev)
80 {
81 u_int32_t apsize = AGP_GET_APERTURE(dev);
82 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
83 struct agp_amd_gatt *gatt;
84 int i, npages, pdir_offset;
85
86 if (bootverbose)
87 device_printf(dev,
88 "allocating GATT for aperture of size %dM\n",
89 apsize / (1024*1024));
90
91 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
92 if (!gatt)
93 return 0;
94
95 /*
96 * The AMD751 uses a page directory to map a non-contiguous
97 * gatt so we don't need to use kmem_alloc_contig.
98 * Allocate individual GATT pages and map them into the page
99 * directory.
100 */
101 gatt->ag_entries = entries;
102 gatt->ag_virtual = (void *)kmem_alloc_attr(kernel_arena,
103 entries * sizeof(u_int32_t), M_NOWAIT | M_ZERO, 0, ~0,
104 VM_MEMATTR_WRITE_COMBINING);
105 if (!gatt->ag_virtual) {
106 if (bootverbose)
107 device_printf(dev, "allocation failed\n");
108 free(gatt, M_AGP);
109 return 0;
110 }
111
112 /*
113 * Allocate the page directory.
114 */
115 gatt->ag_vdir = (void *)kmem_alloc_attr(kernel_arena, AGP_PAGE_SIZE,
116 M_NOWAIT | M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
117 if (!gatt->ag_vdir) {
118 if (bootverbose)
119 device_printf(dev,
120 "failed to allocate page directory\n");
121 kmem_free(kernel_arena, (vm_offset_t)gatt->ag_virtual,
122 entries * sizeof(u_int32_t));
123 free(gatt, M_AGP);
124 return 0;
125 }
126
127 gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
128 if(bootverbose)
129 device_printf(dev, "gatt -> ag_pdir %#lx\n",
130 (u_long)gatt->ag_pdir);
131 /*
132 * Allocate the gatt pages
133 */
134 gatt->ag_entries = entries;
135 if(bootverbose)
136 device_printf(dev, "allocating GATT for %d AGP page entries\n",
137 gatt->ag_entries);
138
139 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
140
141 /*
142 * Map the pages of the GATT into the page directory.
143 *
144 * The GATT page addresses are mapped into the directory offset by
145 * an amount dependent on the base address of the aperture. This
146 * is and offset into the page directory, not an offset added to
147 * the addresses of the gatt pages.
148 */
149
150 pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
151
152 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
153 >> AGP_PAGE_SHIFT);
154
155 for (i = 0; i < npages; i++) {
156 vm_offset_t va;
157 vm_offset_t pa;
158
159 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
160 pa = vtophys(va);
161 gatt->ag_vdir[i + pdir_offset] = pa | 1;
162 }
163
164 return gatt;
165 }
166
167 static void
168 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
169 {
170 kmem_free(kernel_arena, (vm_offset_t)gatt->ag_vdir, AGP_PAGE_SIZE);
171 kmem_free(kernel_arena, (vm_offset_t)gatt->ag_virtual,
172 gatt->ag_entries * sizeof(u_int32_t));
173 free(gatt, M_AGP);
174 }
175
176 static const char*
177 agp_amd_match(device_t dev)
178 {
179 if (pci_get_class(dev) != PCIC_BRIDGE
180 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
181 return NULL;
182
183 if (agp_find_caps(dev) == 0)
184 return NULL;
185
186 switch (pci_get_devid(dev)) {
187 case 0x70061022:
188 return ("AMD 751 host to AGP bridge");
189 case 0x700e1022:
190 return ("AMD 761 host to AGP bridge");
191 case 0x700c1022:
192 return ("AMD 762 host to AGP bridge");
193 }
194
195 return NULL;
196 }
197
198 static int
199 agp_amd_probe(device_t dev)
200 {
201 const char *desc;
202
203 if (resource_disabled("agp", device_get_unit(dev)))
204 return (ENXIO);
205 desc = agp_amd_match(dev);
206 if (desc) {
207 device_set_desc(dev, desc);
208 return BUS_PROBE_DEFAULT;
209 }
210
211 return ENXIO;
212 }
213
214 static int
215 agp_amd_attach(device_t dev)
216 {
217 struct agp_amd_softc *sc = device_get_softc(dev);
218 struct agp_amd_gatt *gatt;
219 int error, rid;
220
221 error = agp_generic_attach(dev);
222 if (error)
223 return error;
224
225 rid = AGP_AMD751_REGISTERS;
226 sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
227 RF_ACTIVE);
228 if (!sc->regs) {
229 agp_generic_detach(dev);
230 return ENOMEM;
231 }
232
233 sc->bst = rman_get_bustag(sc->regs);
234 sc->bsh = rman_get_bushandle(sc->regs);
235
236 sc->initial_aperture = AGP_GET_APERTURE(dev);
237
238 for (;;) {
239 gatt = agp_amd_alloc_gatt(dev);
240 if (gatt)
241 break;
242
243 /*
244 * Probably contigmalloc failure. Try reducing the
245 * aperture so that the gatt size reduces.
246 */
247 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
248 return ENOMEM;
249 }
250 sc->gatt = gatt;
251
252 /* Install the gatt. */
253 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_pdir);
254
255 /* Enable synchronisation between host and agp. */
256 pci_write_config(dev,
257 AGP_AMD751_MODECTRL,
258 AGP_AMD751_MODECTRL_SYNEN, 1);
259
260 /* Set indexing mode for two-level and enable page dir cache */
261 pci_write_config(dev,
262 AGP_AMD751_MODECTRL2,
263 AGP_AMD751_MODECTRL2_GPDCE, 1);
264
265 /* Enable the TLB and flush */
266 WRITE2(AGP_AMD751_STATUS,
267 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
268 AGP_FLUSH_TLB(dev);
269
270 return 0;
271 }
272
273 static int
274 agp_amd_detach(device_t dev)
275 {
276 struct agp_amd_softc *sc = device_get_softc(dev);
277
278 agp_free_cdev(dev);
279
280 /* Disable the TLB.. */
281 WRITE2(AGP_AMD751_STATUS,
282 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
283
284 /* Disable host-agp sync */
285 pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
286
287 /* Clear the GATT base */
288 WRITE4(AGP_AMD751_ATTBASE, 0);
289
290 /* Put the aperture back the way it started. */
291 AGP_SET_APERTURE(dev, sc->initial_aperture);
292
293 agp_amd_free_gatt(sc->gatt);
294 agp_free_res(dev);
295
296 bus_release_resource(dev, SYS_RES_MEMORY,
297 AGP_AMD751_REGISTERS, sc->regs);
298
299 return 0;
300 }
301
302 static u_int32_t
303 agp_amd_get_aperture(device_t dev)
304 {
305 int vas;
306
307 /*
308 * The aperture size is equal to 32M<<vas.
309 */
310 vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
311 return (32*1024*1024) << vas;
312 }
313
314 static int
315 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
316 {
317 int vas;
318
319 /*
320 * Check for a power of two and make sure its within the
321 * programmable range.
322 */
323 if (aperture & (aperture - 1)
324 || aperture < 32*1024*1024
325 || aperture > 2U*1024*1024*1024)
326 return EINVAL;
327
328 vas = ffs(aperture / 32*1024*1024) - 1;
329
330 /*
331 * While the size register is bits 1-3 of APCTRL, bit 0 must be
332 * set for the size value to be 'valid'
333 */
334 pci_write_config(dev, AGP_AMD751_APCTRL,
335 (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
336 | ((vas << 1) | 1))), 1);
337
338 return 0;
339 }
340
341 static int
342 agp_amd_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
343 {
344 struct agp_amd_softc *sc = device_get_softc(dev);
345
346 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
347 return EINVAL;
348
349 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
350 return 0;
351 }
352
353 static int
354 agp_amd_unbind_page(device_t dev, vm_offset_t offset)
355 {
356 struct agp_amd_softc *sc = device_get_softc(dev);
357
358 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
359 return EINVAL;
360
361 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
362 return 0;
363 }
364
365 static void
366 agp_amd_flush_tlb(device_t dev)
367 {
368 struct agp_amd_softc *sc = device_get_softc(dev);
369
370 /* Set the cache invalidate bit and wait for the chipset to clear */
371 WRITE4(AGP_AMD751_TLBCTRL, 1);
372 do {
373 DELAY(1);
374 } while (READ4(AGP_AMD751_TLBCTRL));
375 }
376
377 static device_method_t agp_amd_methods[] = {
378 /* Device interface */
379 DEVMETHOD(device_probe, agp_amd_probe),
380 DEVMETHOD(device_attach, agp_amd_attach),
381 DEVMETHOD(device_detach, agp_amd_detach),
382 DEVMETHOD(device_shutdown, bus_generic_shutdown),
383 DEVMETHOD(device_suspend, bus_generic_suspend),
384 DEVMETHOD(device_resume, bus_generic_resume),
385
386 /* AGP interface */
387 DEVMETHOD(agp_get_aperture, agp_amd_get_aperture),
388 DEVMETHOD(agp_set_aperture, agp_amd_set_aperture),
389 DEVMETHOD(agp_bind_page, agp_amd_bind_page),
390 DEVMETHOD(agp_unbind_page, agp_amd_unbind_page),
391 DEVMETHOD(agp_flush_tlb, agp_amd_flush_tlb),
392 DEVMETHOD(agp_enable, agp_generic_enable),
393 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
394 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
395 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
396 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
397
398 { 0, 0 }
399 };
400
401 static driver_t agp_amd_driver = {
402 "agp",
403 agp_amd_methods,
404 sizeof(struct agp_amd_softc),
405 };
406
407 static devclass_t agp_devclass;
408
409 DRIVER_MODULE(agp_amd, hostb, agp_amd_driver, agp_devclass, 0, 0);
410 MODULE_DEPEND(agp_amd, agp, 1, 1, 1);
411 MODULE_DEPEND(agp_amd, pci, 1, 1, 1);
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