FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp_amd.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/12.0/sys/dev/agp/agp_amd.c 338318 2018-08-25 19:38:08Z alc $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/bus.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/proc.h>
41
42 #include <dev/agp/agppriv.h>
43 #include <dev/agp/agpreg.h>
44 #include <dev/pci/pcivar.h>
45 #include <dev/pci/pcireg.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_extern.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_object.h>
51 #include <vm/pmap.h>
52 #include <machine/bus.h>
53 #include <machine/resource.h>
54 #include <sys/rman.h>
55
56 MALLOC_DECLARE(M_AGP);
57
58 #define READ2(off) bus_space_read_2(sc->bst, sc->bsh, off)
59 #define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off)
60 #define WRITE2(off,v) bus_space_write_2(sc->bst, sc->bsh, off, v)
61 #define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v)
62
63 struct agp_amd_gatt {
64 u_int32_t ag_entries;
65 u_int32_t *ag_virtual; /* virtual address of gatt */
66 vm_offset_t ag_physical;
67 u_int32_t *ag_vdir; /* virtual address of page dir */
68 vm_offset_t ag_pdir; /* physical address of page dir */
69 };
70
71 struct agp_amd_softc {
72 struct agp_softc agp;
73 struct resource *regs; /* memory mapped control registers */
74 bus_space_tag_t bst; /* bus_space tag */
75 bus_space_handle_t bsh; /* bus_space handle */
76 u_int32_t initial_aperture; /* aperture size at startup */
77 struct agp_amd_gatt *gatt;
78 };
79
80 static struct agp_amd_gatt *
81 agp_amd_alloc_gatt(device_t dev)
82 {
83 u_int32_t apsize = AGP_GET_APERTURE(dev);
84 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
85 struct agp_amd_gatt *gatt;
86 int i, npages, pdir_offset;
87
88 if (bootverbose)
89 device_printf(dev,
90 "allocating GATT for aperture of size %dM\n",
91 apsize / (1024*1024));
92
93 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
94 if (!gatt)
95 return 0;
96
97 /*
98 * The AMD751 uses a page directory to map a non-contiguous
99 * gatt so we don't need to use kmem_alloc_contig.
100 * Allocate individual GATT pages and map them into the page
101 * directory.
102 */
103 gatt->ag_entries = entries;
104 gatt->ag_virtual = (void *)kmem_alloc_attr(entries * sizeof(u_int32_t),
105 M_NOWAIT | M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
106 if (!gatt->ag_virtual) {
107 if (bootverbose)
108 device_printf(dev, "allocation failed\n");
109 free(gatt, M_AGP);
110 return 0;
111 }
112
113 /*
114 * Allocate the page directory.
115 */
116 gatt->ag_vdir = (void *)kmem_alloc_attr(AGP_PAGE_SIZE, M_NOWAIT |
117 M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
118 if (!gatt->ag_vdir) {
119 if (bootverbose)
120 device_printf(dev,
121 "failed to allocate page directory\n");
122 kmem_free((vm_offset_t)gatt->ag_virtual, entries *
123 sizeof(u_int32_t));
124 free(gatt, M_AGP);
125 return 0;
126 }
127
128 gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
129 if(bootverbose)
130 device_printf(dev, "gatt -> ag_pdir %#lx\n",
131 (u_long)gatt->ag_pdir);
132 /*
133 * Allocate the gatt pages
134 */
135 gatt->ag_entries = entries;
136 if(bootverbose)
137 device_printf(dev, "allocating GATT for %d AGP page entries\n",
138 gatt->ag_entries);
139
140 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
141
142 /*
143 * Map the pages of the GATT into the page directory.
144 *
145 * The GATT page addresses are mapped into the directory offset by
146 * an amount dependent on the base address of the aperture. This
147 * is and offset into the page directory, not an offset added to
148 * the addresses of the gatt pages.
149 */
150
151 pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
152
153 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
154 >> AGP_PAGE_SHIFT);
155
156 for (i = 0; i < npages; i++) {
157 vm_offset_t va;
158 vm_offset_t pa;
159
160 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
161 pa = vtophys(va);
162 gatt->ag_vdir[i + pdir_offset] = pa | 1;
163 }
164
165 return gatt;
166 }
167
168 static void
169 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
170 {
171 kmem_free((vm_offset_t)gatt->ag_vdir, AGP_PAGE_SIZE);
172 kmem_free((vm_offset_t)gatt->ag_virtual, gatt->ag_entries *
173 sizeof(u_int32_t));
174 free(gatt, M_AGP);
175 }
176
177 static const char*
178 agp_amd_match(device_t dev)
179 {
180 if (pci_get_class(dev) != PCIC_BRIDGE
181 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
182 return NULL;
183
184 if (agp_find_caps(dev) == 0)
185 return NULL;
186
187 switch (pci_get_devid(dev)) {
188 case 0x70061022:
189 return ("AMD 751 host to AGP bridge");
190 case 0x700e1022:
191 return ("AMD 761 host to AGP bridge");
192 case 0x700c1022:
193 return ("AMD 762 host to AGP bridge");
194 }
195
196 return NULL;
197 }
198
199 static int
200 agp_amd_probe(device_t dev)
201 {
202 const char *desc;
203
204 if (resource_disabled("agp", device_get_unit(dev)))
205 return (ENXIO);
206 desc = agp_amd_match(dev);
207 if (desc) {
208 device_set_desc(dev, desc);
209 return BUS_PROBE_DEFAULT;
210 }
211
212 return ENXIO;
213 }
214
215 static int
216 agp_amd_attach(device_t dev)
217 {
218 struct agp_amd_softc *sc = device_get_softc(dev);
219 struct agp_amd_gatt *gatt;
220 int error, rid;
221
222 error = agp_generic_attach(dev);
223 if (error)
224 return error;
225
226 rid = AGP_AMD751_REGISTERS;
227 sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
228 RF_ACTIVE);
229 if (!sc->regs) {
230 agp_generic_detach(dev);
231 return ENOMEM;
232 }
233
234 sc->bst = rman_get_bustag(sc->regs);
235 sc->bsh = rman_get_bushandle(sc->regs);
236
237 sc->initial_aperture = AGP_GET_APERTURE(dev);
238
239 for (;;) {
240 gatt = agp_amd_alloc_gatt(dev);
241 if (gatt)
242 break;
243
244 /*
245 * Probably contigmalloc failure. Try reducing the
246 * aperture so that the gatt size reduces.
247 */
248 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
249 return ENOMEM;
250 }
251 sc->gatt = gatt;
252
253 /* Install the gatt. */
254 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_pdir);
255
256 /* Enable synchronisation between host and agp. */
257 pci_write_config(dev,
258 AGP_AMD751_MODECTRL,
259 AGP_AMD751_MODECTRL_SYNEN, 1);
260
261 /* Set indexing mode for two-level and enable page dir cache */
262 pci_write_config(dev,
263 AGP_AMD751_MODECTRL2,
264 AGP_AMD751_MODECTRL2_GPDCE, 1);
265
266 /* Enable the TLB and flush */
267 WRITE2(AGP_AMD751_STATUS,
268 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
269 AGP_FLUSH_TLB(dev);
270
271 return 0;
272 }
273
274 static int
275 agp_amd_detach(device_t dev)
276 {
277 struct agp_amd_softc *sc = device_get_softc(dev);
278
279 agp_free_cdev(dev);
280
281 /* Disable the TLB.. */
282 WRITE2(AGP_AMD751_STATUS,
283 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
284
285 /* Disable host-agp sync */
286 pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
287
288 /* Clear the GATT base */
289 WRITE4(AGP_AMD751_ATTBASE, 0);
290
291 /* Put the aperture back the way it started. */
292 AGP_SET_APERTURE(dev, sc->initial_aperture);
293
294 agp_amd_free_gatt(sc->gatt);
295 agp_free_res(dev);
296
297 bus_release_resource(dev, SYS_RES_MEMORY,
298 AGP_AMD751_REGISTERS, sc->regs);
299
300 return 0;
301 }
302
303 static u_int32_t
304 agp_amd_get_aperture(device_t dev)
305 {
306 int vas;
307
308 /*
309 * The aperture size is equal to 32M<<vas.
310 */
311 vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
312 return (32*1024*1024) << vas;
313 }
314
315 static int
316 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
317 {
318 int vas;
319
320 /*
321 * Check for a power of two and make sure its within the
322 * programmable range.
323 */
324 if (aperture & (aperture - 1)
325 || aperture < 32*1024*1024
326 || aperture > 2U*1024*1024*1024)
327 return EINVAL;
328
329 vas = ffs(aperture / 32*1024*1024) - 1;
330
331 /*
332 * While the size register is bits 1-3 of APCTRL, bit 0 must be
333 * set for the size value to be 'valid'
334 */
335 pci_write_config(dev, AGP_AMD751_APCTRL,
336 (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
337 | ((vas << 1) | 1))), 1);
338
339 return 0;
340 }
341
342 static int
343 agp_amd_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
344 {
345 struct agp_amd_softc *sc = device_get_softc(dev);
346
347 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
348 return EINVAL;
349
350 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
351 return 0;
352 }
353
354 static int
355 agp_amd_unbind_page(device_t dev, vm_offset_t offset)
356 {
357 struct agp_amd_softc *sc = device_get_softc(dev);
358
359 if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
360 return EINVAL;
361
362 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
363 return 0;
364 }
365
366 static void
367 agp_amd_flush_tlb(device_t dev)
368 {
369 struct agp_amd_softc *sc = device_get_softc(dev);
370
371 /* Set the cache invalidate bit and wait for the chipset to clear */
372 WRITE4(AGP_AMD751_TLBCTRL, 1);
373 do {
374 DELAY(1);
375 } while (READ4(AGP_AMD751_TLBCTRL));
376 }
377
378 static device_method_t agp_amd_methods[] = {
379 /* Device interface */
380 DEVMETHOD(device_probe, agp_amd_probe),
381 DEVMETHOD(device_attach, agp_amd_attach),
382 DEVMETHOD(device_detach, agp_amd_detach),
383 DEVMETHOD(device_shutdown, bus_generic_shutdown),
384 DEVMETHOD(device_suspend, bus_generic_suspend),
385 DEVMETHOD(device_resume, bus_generic_resume),
386
387 /* AGP interface */
388 DEVMETHOD(agp_get_aperture, agp_amd_get_aperture),
389 DEVMETHOD(agp_set_aperture, agp_amd_set_aperture),
390 DEVMETHOD(agp_bind_page, agp_amd_bind_page),
391 DEVMETHOD(agp_unbind_page, agp_amd_unbind_page),
392 DEVMETHOD(agp_flush_tlb, agp_amd_flush_tlb),
393 DEVMETHOD(agp_enable, agp_generic_enable),
394 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
395 DEVMETHOD(agp_free_memory, agp_generic_free_memory),
396 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
397 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
398
399 { 0, 0 }
400 };
401
402 static driver_t agp_amd_driver = {
403 "agp",
404 agp_amd_methods,
405 sizeof(struct agp_amd_softc),
406 };
407
408 static devclass_t agp_devclass;
409
410 DRIVER_MODULE(agp_amd, hostb, agp_amd_driver, agp_devclass, 0, 0);
411 MODULE_DEPEND(agp_amd, agp, 1, 1, 1);
412 MODULE_DEPEND(agp_amd, pci, 1, 1, 1);
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