Merge branch 'linus' into tmp.x86.mpparse.new
[linux-2.6] / drivers / char / agp / generic.c
1 /*
2  * AGPGART driver.
3  * Copyright (C) 2004 Silicon Graphics, Inc.
4  * Copyright (C) 2002-2005 Dave Jones.
5  * Copyright (C) 1999 Jeff Hartmann.
6  * Copyright (C) 1999 Precision Insight, Inc.
7  * Copyright (C) 1999 Xi Graphics, Inc.
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the "Software"),
11  * to deal in the Software without restriction, including without limitation
12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included
17  * in all copies or substantial portions of the Software.
18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26  *
27  * TODO:
28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
29  */
30 #include <linux/module.h>
31 #include <linux/pci.h>
32 #include <linux/init.h>
33 #include <linux/pagemap.h>
34 #include <linux/miscdevice.h>
35 #include <linux/pm.h>
36 #include <linux/agp_backend.h>
37 #include <linux/vmalloc.h>
38 #include <linux/dma-mapping.h>
39 #include <linux/mm.h>
40 #include <linux/sched.h>
41 #include <asm/io.h>
42 #include <asm/cacheflush.h>
43 #include <asm/pgtable.h>
44 #include "agp.h"
45
46 __u32 *agp_gatt_table;
47 int agp_memory_reserved;
48
49 /*
50  * Needed by the Nforce GART driver for the time being. Would be
51  * nice to do this some other way instead of needing this export.
52  */
53 EXPORT_SYMBOL_GPL(agp_memory_reserved);
54
55 /*
56  * Generic routines for handling agp_memory structures -
57  * They use the basic page allocation routines to do the brunt of the work.
58  */
59
60 void agp_free_key(int key)
61 {
62         if (key < 0)
63                 return;
64
65         if (key < MAXKEY)
66                 clear_bit(key, agp_bridge->key_list);
67 }
68 EXPORT_SYMBOL(agp_free_key);
69
70
71 static int agp_get_key(void)
72 {
73         int bit;
74
75         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
76         if (bit < MAXKEY) {
77                 set_bit(bit, agp_bridge->key_list);
78                 return bit;
79         }
80         return -1;
81 }
82
83 void agp_flush_chipset(struct agp_bridge_data *bridge)
84 {
85         if (bridge->driver->chipset_flush)
86                 bridge->driver->chipset_flush(bridge);
87 }
88 EXPORT_SYMBOL(agp_flush_chipset);
89
90 /*
91  * Use kmalloc if possible for the page list. Otherwise fall back to
92  * vmalloc. This speeds things up and also saves memory for small AGP
93  * regions.
94  */
95
96 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
97 {
98         mem->memory = NULL;
99         mem->vmalloc_flag = false;
100
101         if (size <= 2*PAGE_SIZE)
102                 mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
103         if (mem->memory == NULL) {
104                 mem->memory = vmalloc(size);
105                 mem->vmalloc_flag = true;
106         }
107 }
108 EXPORT_SYMBOL(agp_alloc_page_array);
109
110 void agp_free_page_array(struct agp_memory *mem)
111 {
112         if (mem->vmalloc_flag) {
113                 vfree(mem->memory);
114         } else {
115                 kfree(mem->memory);
116         }
117 }
118 EXPORT_SYMBOL(agp_free_page_array);
119
120
121 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
122 {
123         struct agp_memory *new;
124         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
125
126         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
127         if (new == NULL)
128                 return NULL;
129
130         new->key = agp_get_key();
131
132         if (new->key < 0) {
133                 kfree(new);
134                 return NULL;
135         }
136
137         agp_alloc_page_array(alloc_size, new);
138
139         if (new->memory == NULL) {
140                 agp_free_key(new->key);
141                 kfree(new);
142                 return NULL;
143         }
144         new->num_scratch_pages = 0;
145         return new;
146 }
147
148 struct agp_memory *agp_create_memory(int scratch_pages)
149 {
150         struct agp_memory *new;
151
152         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
153         if (new == NULL)
154                 return NULL;
155
156         new->key = agp_get_key();
157
158         if (new->key < 0) {
159                 kfree(new);
160                 return NULL;
161         }
162
163         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
164
165         if (new->memory == NULL) {
166                 agp_free_key(new->key);
167                 kfree(new);
168                 return NULL;
169         }
170         new->num_scratch_pages = scratch_pages;
171         new->type = AGP_NORMAL_MEMORY;
172         return new;
173 }
174 EXPORT_SYMBOL(agp_create_memory);
175
176 /**
177  *      agp_free_memory - free memory associated with an agp_memory pointer.
178  *
179  *      @curr:          agp_memory pointer to be freed.
180  *
181  *      It is the only function that can be called when the backend is not owned
182  *      by the caller.  (So it can free memory on client death.)
183  */
184 void agp_free_memory(struct agp_memory *curr)
185 {
186         size_t i;
187
188         if (curr == NULL)
189                 return;
190
191         if (curr->is_bound)
192                 agp_unbind_memory(curr);
193
194         if (curr->type >= AGP_USER_TYPES) {
195                 agp_generic_free_by_type(curr);
196                 return;
197         }
198
199         if (curr->type != 0) {
200                 curr->bridge->driver->free_by_type(curr);
201                 return;
202         }
203         if (curr->page_count != 0) {
204                 for (i = 0; i < curr->page_count; i++) {
205                         curr->memory[i] = (unsigned long)gart_to_virt(curr->memory[i]);
206                         curr->bridge->driver->agp_destroy_page((void *)curr->memory[i],
207                                                                AGP_PAGE_DESTROY_UNMAP);
208                 }
209                 for (i = 0; i < curr->page_count; i++) {
210                         curr->bridge->driver->agp_destroy_page((void *)curr->memory[i],
211                                                                AGP_PAGE_DESTROY_FREE);
212                 }
213         }
214         agp_free_key(curr->key);
215         agp_free_page_array(curr);
216         kfree(curr);
217 }
218 EXPORT_SYMBOL(agp_free_memory);
219
220 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
221
222 /**
223  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
224  *
225  *      @page_count:    size_t argument of the number of pages
226  *      @type:  u32 argument of the type of memory to be allocated.
227  *
228  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
229  *      maps to physical ram.  Any other type is device dependent.
230  *
231  *      It returns NULL whenever memory is unavailable.
232  */
233 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
234                                         size_t page_count, u32 type)
235 {
236         int scratch_pages;
237         struct agp_memory *new;
238         size_t i;
239
240         if (!bridge)
241                 return NULL;
242
243         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
244                 return NULL;
245
246         if (type >= AGP_USER_TYPES) {
247                 new = agp_generic_alloc_user(page_count, type);
248                 if (new)
249                         new->bridge = bridge;
250                 return new;
251         }
252
253         if (type != 0) {
254                 new = bridge->driver->alloc_by_type(page_count, type);
255                 if (new)
256                         new->bridge = bridge;
257                 return new;
258         }
259
260         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
261
262         new = agp_create_memory(scratch_pages);
263
264         if (new == NULL)
265                 return NULL;
266
267         for (i = 0; i < page_count; i++) {
268                 void *addr = bridge->driver->agp_alloc_page(bridge);
269
270                 if (addr == NULL) {
271                         agp_free_memory(new);
272                         return NULL;
273                 }
274                 new->memory[i] = virt_to_gart(addr);
275                 new->page_count++;
276         }
277         new->bridge = bridge;
278
279         return new;
280 }
281 EXPORT_SYMBOL(agp_allocate_memory);
282
283
284 /* End - Generic routines for handling agp_memory structures */
285
286
287 static int agp_return_size(void)
288 {
289         int current_size;
290         void *temp;
291
292         temp = agp_bridge->current_size;
293
294         switch (agp_bridge->driver->size_type) {
295         case U8_APER_SIZE:
296                 current_size = A_SIZE_8(temp)->size;
297                 break;
298         case U16_APER_SIZE:
299                 current_size = A_SIZE_16(temp)->size;
300                 break;
301         case U32_APER_SIZE:
302                 current_size = A_SIZE_32(temp)->size;
303                 break;
304         case LVL2_APER_SIZE:
305                 current_size = A_SIZE_LVL2(temp)->size;
306                 break;
307         case FIXED_APER_SIZE:
308                 current_size = A_SIZE_FIX(temp)->size;
309                 break;
310         default:
311                 current_size = 0;
312                 break;
313         }
314
315         current_size -= (agp_memory_reserved / (1024*1024));
316         if (current_size <0)
317                 current_size = 0;
318         return current_size;
319 }
320
321
322 int agp_num_entries(void)
323 {
324         int num_entries;
325         void *temp;
326
327         temp = agp_bridge->current_size;
328
329         switch (agp_bridge->driver->size_type) {
330         case U8_APER_SIZE:
331                 num_entries = A_SIZE_8(temp)->num_entries;
332                 break;
333         case U16_APER_SIZE:
334                 num_entries = A_SIZE_16(temp)->num_entries;
335                 break;
336         case U32_APER_SIZE:
337                 num_entries = A_SIZE_32(temp)->num_entries;
338                 break;
339         case LVL2_APER_SIZE:
340                 num_entries = A_SIZE_LVL2(temp)->num_entries;
341                 break;
342         case FIXED_APER_SIZE:
343                 num_entries = A_SIZE_FIX(temp)->num_entries;
344                 break;
345         default:
346                 num_entries = 0;
347                 break;
348         }
349
350         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
351         if (num_entries<0)
352                 num_entries = 0;
353         return num_entries;
354 }
355 EXPORT_SYMBOL_GPL(agp_num_entries);
356
357
358 /**
359  *      agp_copy_info  -  copy bridge state information
360  *
361  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
362  *
363  *      This function copies information about the agp bridge device and the state of
364  *      the agp backend into an agp_kern_info pointer.
365  */
366 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
367 {
368         memset(info, 0, sizeof(struct agp_kern_info));
369         if (!bridge) {
370                 info->chipset = NOT_SUPPORTED;
371                 return -EIO;
372         }
373
374         info->version.major = bridge->version->major;
375         info->version.minor = bridge->version->minor;
376         info->chipset = SUPPORTED;
377         info->device = bridge->dev;
378         if (bridge->mode & AGPSTAT_MODE_3_0)
379                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
380         else
381                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
382         info->aper_base = bridge->gart_bus_addr;
383         info->aper_size = agp_return_size();
384         info->max_memory = bridge->max_memory_agp;
385         info->current_memory = atomic_read(&bridge->current_memory_agp);
386         info->cant_use_aperture = bridge->driver->cant_use_aperture;
387         info->vm_ops = bridge->vm_ops;
388         info->page_mask = ~0UL;
389         return 0;
390 }
391 EXPORT_SYMBOL(agp_copy_info);
392
393 /* End - Routine to copy over information structure */
394
395 /*
396  * Routines for handling swapping of agp_memory into the GATT -
397  * These routines take agp_memory and insert them into the GATT.
398  * They call device specific routines to actually write to the GATT.
399  */
400
401 /**
402  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
403  *
404  *      @curr:          agp_memory pointer
405  *      @pg_start:      an offset into the graphics aperture translation table
406  *
407  *      It returns -EINVAL if the pointer == NULL.
408  *      It returns -EBUSY if the area of the table requested is already in use.
409  */
410 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
411 {
412         int ret_val;
413
414         if (curr == NULL)
415                 return -EINVAL;
416
417         if (curr->is_bound) {
418                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
419                 return -EINVAL;
420         }
421         if (!curr->is_flushed) {
422                 curr->bridge->driver->cache_flush();
423                 curr->is_flushed = true;
424         }
425         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
426
427         if (ret_val != 0)
428                 return ret_val;
429
430         curr->is_bound = true;
431         curr->pg_start = pg_start;
432         return 0;
433 }
434 EXPORT_SYMBOL(agp_bind_memory);
435
436
437 /**
438  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
439  *
440  * @curr:       agp_memory pointer to be removed from the GATT.
441  *
442  * It returns -EINVAL if this piece of agp_memory is not currently bound to
443  * the graphics aperture translation table or if the agp_memory pointer == NULL
444  */
445 int agp_unbind_memory(struct agp_memory *curr)
446 {
447         int ret_val;
448
449         if (curr == NULL)
450                 return -EINVAL;
451
452         if (!curr->is_bound) {
453                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
454                 return -EINVAL;
455         }
456
457         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
458
459         if (ret_val != 0)
460                 return ret_val;
461
462         curr->is_bound = false;
463         curr->pg_start = 0;
464         return 0;
465 }
466 EXPORT_SYMBOL(agp_unbind_memory);
467
468 /* End - Routines for handling swapping of agp_memory into the GATT */
469
470
471 /* Generic Agp routines - Start */
472 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
473 {
474         u32 tmp;
475
476         if (*requested_mode & AGP2_RESERVED_MASK) {
477                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
478                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
479                 *requested_mode &= ~AGP2_RESERVED_MASK;
480         }
481
482         /*
483          * Some dumb bridges are programmed to disobey the AGP2 spec.
484          * This is likely a BIOS misprogramming rather than poweron default, or
485          * it would be a lot more common.
486          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
487          * AGPv2 spec 6.1.9 states:
488          *   The RATE field indicates the data transfer rates supported by this
489          *   device. A.G.P. devices must report all that apply.
490          * Fix them up as best we can.
491          */
492         switch (*bridge_agpstat & 7) {
493         case 4:
494                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
495                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
496                         "Fixing up support for x2 & x1\n");
497                 break;
498         case 2:
499                 *bridge_agpstat |= AGPSTAT2_1X;
500                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
501                         "Fixing up support for x1\n");
502                 break;
503         default:
504                 break;
505         }
506
507         /* Check the speed bits make sense. Only one should be set. */
508         tmp = *requested_mode & 7;
509         switch (tmp) {
510                 case 0:
511                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
512                         *requested_mode |= AGPSTAT2_1X;
513                         break;
514                 case 1:
515                 case 2:
516                         break;
517                 case 3:
518                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
519                         break;
520                 case 4:
521                         break;
522                 case 5:
523                 case 6:
524                 case 7:
525                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
526                         break;
527         }
528
529         /* disable SBA if it's not supported */
530         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
531                 *bridge_agpstat &= ~AGPSTAT_SBA;
532
533         /* Set rate */
534         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
535                 *bridge_agpstat &= ~AGPSTAT2_4X;
536
537         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
538                 *bridge_agpstat &= ~AGPSTAT2_2X;
539
540         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
541                 *bridge_agpstat &= ~AGPSTAT2_1X;
542
543         /* Now we know what mode it should be, clear out the unwanted bits. */
544         if (*bridge_agpstat & AGPSTAT2_4X)
545                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
546
547         if (*bridge_agpstat & AGPSTAT2_2X)
548                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
549
550         if (*bridge_agpstat & AGPSTAT2_1X)
551                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
552
553         /* Apply any errata. */
554         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
555                 *bridge_agpstat &= ~AGPSTAT_FW;
556
557         if (agp_bridge->flags & AGP_ERRATA_SBA)
558                 *bridge_agpstat &= ~AGPSTAT_SBA;
559
560         if (agp_bridge->flags & AGP_ERRATA_1X) {
561                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
562                 *bridge_agpstat |= AGPSTAT2_1X;
563         }
564
565         /* If we've dropped down to 1X, disable fast writes. */
566         if (*bridge_agpstat & AGPSTAT2_1X)
567                 *bridge_agpstat &= ~AGPSTAT_FW;
568 }
569
570 /*
571  * requested_mode = Mode requested by (typically) X.
572  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
573  * vga_agpstat = PCI_AGP_STATUS from graphic card.
574  */
575 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
576 {
577         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
578         u32 tmp;
579
580         if (*requested_mode & AGP3_RESERVED_MASK) {
581                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
582                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
583                 *requested_mode &= ~AGP3_RESERVED_MASK;
584         }
585
586         /* Check the speed bits make sense. */
587         tmp = *requested_mode & 7;
588         if (tmp == 0) {
589                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
590                 *requested_mode |= AGPSTAT3_4X;
591         }
592         if (tmp >= 3) {
593                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
594                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
595         }
596
597         /* ARQSZ - Set the value to the maximum one.
598          * Don't allow the mode register to override values. */
599         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
600                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
601
602         /* Calibration cycle.
603          * Don't allow the mode register to override values. */
604         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
605                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
606
607         /* SBA *must* be supported for AGP v3 */
608         *bridge_agpstat |= AGPSTAT_SBA;
609
610         /*
611          * Set speed.
612          * Check for invalid speeds. This can happen when applications
613          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
614          */
615         if (*requested_mode & AGPSTAT_MODE_3_0) {
616                 /*
617                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
618                  * have been passed a 3.0 mode, but with 2.x speed bits set.
619                  * AGP2.x 4x -> AGP3.0 4x.
620                  */
621                 if (*requested_mode & AGPSTAT2_4X) {
622                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
623                                                 current->comm, *requested_mode);
624                         *requested_mode &= ~AGPSTAT2_4X;
625                         *requested_mode |= AGPSTAT3_4X;
626                 }
627         } else {
628                 /*
629                  * The caller doesn't know what they are doing. We are in 3.0 mode,
630                  * but have been passed an AGP 2.x mode.
631                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
632                  */
633                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
634                                         current->comm, *requested_mode);
635                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
636                 *requested_mode |= AGPSTAT3_4X;
637         }
638
639         if (*requested_mode & AGPSTAT3_8X) {
640                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
641                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
642                         *bridge_agpstat |= AGPSTAT3_4X;
643                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
644                         return;
645                 }
646                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
647                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
648                         *bridge_agpstat |= AGPSTAT3_4X;
649                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
650                         return;
651                 }
652                 /* All set, bridge & device can do AGP x8*/
653                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
654                 goto done;
655
656         } else if (*requested_mode & AGPSTAT3_4X) {
657                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
658                 *bridge_agpstat |= AGPSTAT3_4X;
659                 goto done;
660
661         } else {
662
663                 /*
664                  * If we didn't specify an AGP mode, we see if both
665                  * the graphics card, and the bridge can do x8, and use if so.
666                  * If not, we fall back to x4 mode.
667                  */
668                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
669                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
670                                 "supported by bridge & card (x8).\n");
671                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
672                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
673                 } else {
674                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
675                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
676                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
677                                         *bridge_agpstat, origbridge);
678                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
679                                 *bridge_agpstat |= AGPSTAT3_4X;
680                         }
681                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
682                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
683                                         *vga_agpstat, origvga);
684                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
685                                 *vga_agpstat |= AGPSTAT3_4X;
686                         }
687                 }
688         }
689
690 done:
691         /* Apply any errata. */
692         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
693                 *bridge_agpstat &= ~AGPSTAT_FW;
694
695         if (agp_bridge->flags & AGP_ERRATA_SBA)
696                 *bridge_agpstat &= ~AGPSTAT_SBA;
697
698         if (agp_bridge->flags & AGP_ERRATA_1X) {
699                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
700                 *bridge_agpstat |= AGPSTAT2_1X;
701         }
702 }
703
704
705 /**
706  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
707  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
708  * @requested_mode: requested agp_stat from userspace (Typically from X)
709  * @bridge_agpstat: current agp_stat from AGP bridge.
710  *
711  * This function will hunt for an AGP graphics card, and try to match
712  * the requested mode to the capabilities of both the bridge and the card.
713  */
714 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
715 {
716         struct pci_dev *device = NULL;
717         u32 vga_agpstat;
718         u8 cap_ptr;
719
720         for (;;) {
721                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
722                 if (!device) {
723                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
724                         return 0;
725                 }
726                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
727                 if (cap_ptr)
728                         break;
729         }
730
731         /*
732          * Ok, here we have a AGP device. Disable impossible
733          * settings, and adjust the readqueue to the minimum.
734          */
735         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
736
737         /* adjust RQ depth */
738         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
739              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
740                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
741
742         /* disable FW if it's not supported */
743         if (!((bridge_agpstat & AGPSTAT_FW) &&
744                  (vga_agpstat & AGPSTAT_FW) &&
745                  (requested_mode & AGPSTAT_FW)))
746                 bridge_agpstat &= ~AGPSTAT_FW;
747
748         /* Check to see if we are operating in 3.0 mode */
749         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
750                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
751         else
752                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
753
754         pci_dev_put(device);
755         return bridge_agpstat;
756 }
757 EXPORT_SYMBOL(agp_collect_device_status);
758
759
760 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
761 {
762         struct pci_dev *device = NULL;
763         int mode;
764
765         mode = bridge_agpstat & 0x7;
766         if (agp_v3)
767                 mode *= 4;
768
769         for_each_pci_dev(device) {
770                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
771                 if (!agp)
772                         continue;
773
774                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
775                                 agp_v3 ? 3 : 2, pci_name(device), mode);
776                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
777         }
778 }
779 EXPORT_SYMBOL(agp_device_command);
780
781
782 void get_agp_version(struct agp_bridge_data *bridge)
783 {
784         u32 ncapid;
785
786         /* Exit early if already set by errata workarounds. */
787         if (bridge->major_version != 0)
788                 return;
789
790         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
791         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
792         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
793 }
794 EXPORT_SYMBOL(get_agp_version);
795
796
797 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
798 {
799         u32 bridge_agpstat, temp;
800
801         get_agp_version(agp_bridge);
802
803         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
804                                 agp_bridge->major_version,
805                                 agp_bridge->minor_version,
806                                 pci_name(agp_bridge->dev));
807
808         pci_read_config_dword(agp_bridge->dev,
809                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
810
811         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
812         if (bridge_agpstat == 0)
813                 /* Something bad happened. FIXME: Return error code? */
814                 return;
815
816         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
817
818         /* Do AGP version specific frobbing. */
819         if (bridge->major_version >= 3) {
820                 if (bridge->mode & AGPSTAT_MODE_3_0) {
821                         /* If we have 3.5, we can do the isoch stuff. */
822                         if (bridge->minor_version >= 5)
823                                 agp_3_5_enable(bridge);
824                         agp_device_command(bridge_agpstat, true);
825                         return;
826                 } else {
827                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
828                     bridge_agpstat &= ~(7<<10) ;
829                     pci_read_config_dword(bridge->dev,
830                                         bridge->capndx+AGPCTRL, &temp);
831                     temp |= (1<<9);
832                     pci_write_config_dword(bridge->dev,
833                                         bridge->capndx+AGPCTRL, temp);
834
835                     printk(KERN_INFO PFX "Device is in legacy mode,"
836                                 " falling back to 2.x\n");
837                 }
838         }
839
840         /* AGP v<3 */
841         agp_device_command(bridge_agpstat, false);
842 }
843 EXPORT_SYMBOL(agp_generic_enable);
844
845
846 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
847 {
848         char *table;
849         char *table_end;
850         int size;
851         int page_order;
852         int num_entries;
853         int i;
854         void *temp;
855         struct page *page;
856
857         /* The generic routines can't handle 2 level gatt's */
858         if (bridge->driver->size_type == LVL2_APER_SIZE)
859                 return -EINVAL;
860
861         table = NULL;
862         i = bridge->aperture_size_idx;
863         temp = bridge->current_size;
864         size = page_order = num_entries = 0;
865
866         if (bridge->driver->size_type != FIXED_APER_SIZE) {
867                 do {
868                         switch (bridge->driver->size_type) {
869                         case U8_APER_SIZE:
870                                 size = A_SIZE_8(temp)->size;
871                                 page_order =
872                                     A_SIZE_8(temp)->page_order;
873                                 num_entries =
874                                     A_SIZE_8(temp)->num_entries;
875                                 break;
876                         case U16_APER_SIZE:
877                                 size = A_SIZE_16(temp)->size;
878                                 page_order = A_SIZE_16(temp)->page_order;
879                                 num_entries = A_SIZE_16(temp)->num_entries;
880                                 break;
881                         case U32_APER_SIZE:
882                                 size = A_SIZE_32(temp)->size;
883                                 page_order = A_SIZE_32(temp)->page_order;
884                                 num_entries = A_SIZE_32(temp)->num_entries;
885                                 break;
886                                 /* This case will never really happen. */
887                         case FIXED_APER_SIZE:
888                         case LVL2_APER_SIZE:
889                         default:
890                                 size = page_order = num_entries = 0;
891                                 break;
892                         }
893
894                         table = alloc_gatt_pages(page_order);
895
896                         if (table == NULL) {
897                                 i++;
898                                 switch (bridge->driver->size_type) {
899                                 case U8_APER_SIZE:
900                                         bridge->current_size = A_IDX8(bridge);
901                                         break;
902                                 case U16_APER_SIZE:
903                                         bridge->current_size = A_IDX16(bridge);
904                                         break;
905                                 case U32_APER_SIZE:
906                                         bridge->current_size = A_IDX32(bridge);
907                                         break;
908                                 /* These cases will never really happen. */
909                                 case FIXED_APER_SIZE:
910                                 case LVL2_APER_SIZE:
911                                 default:
912                                         break;
913                                 }
914                                 temp = bridge->current_size;
915                         } else {
916                                 bridge->aperture_size_idx = i;
917                         }
918                 } while (!table && (i < bridge->driver->num_aperture_sizes));
919         } else {
920                 size = ((struct aper_size_info_fixed *) temp)->size;
921                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
922                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
923                 table = alloc_gatt_pages(page_order);
924         }
925
926         if (table == NULL)
927                 return -ENOMEM;
928
929         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
930
931         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
932                 SetPageReserved(page);
933
934         bridge->gatt_table_real = (u32 *) table;
935         agp_gatt_table = (void *)table;
936
937         bridge->driver->cache_flush();
938 #ifdef CONFIG_X86
939         set_memory_uc((unsigned long)table, 1 << page_order);
940         bridge->gatt_table = (void *)table;
941 #else
942         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
943                                         (PAGE_SIZE * (1 << page_order)));
944         bridge->driver->cache_flush();
945 #endif
946
947         if (bridge->gatt_table == NULL) {
948                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
949                         ClearPageReserved(page);
950
951                 free_gatt_pages(table, page_order);
952
953                 return -ENOMEM;
954         }
955         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
956
957         /* AK: bogus, should encode addresses > 4GB */
958         for (i = 0; i < num_entries; i++) {
959                 writel(bridge->scratch_page, bridge->gatt_table+i);
960                 readl(bridge->gatt_table+i);    /* PCI Posting. */
961         }
962
963         return 0;
964 }
965 EXPORT_SYMBOL(agp_generic_create_gatt_table);
966
967 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
968 {
969         int page_order;
970         char *table, *table_end;
971         void *temp;
972         struct page *page;
973
974         temp = bridge->current_size;
975
976         switch (bridge->driver->size_type) {
977         case U8_APER_SIZE:
978                 page_order = A_SIZE_8(temp)->page_order;
979                 break;
980         case U16_APER_SIZE:
981                 page_order = A_SIZE_16(temp)->page_order;
982                 break;
983         case U32_APER_SIZE:
984                 page_order = A_SIZE_32(temp)->page_order;
985                 break;
986         case FIXED_APER_SIZE:
987                 page_order = A_SIZE_FIX(temp)->page_order;
988                 break;
989         case LVL2_APER_SIZE:
990                 /* The generic routines can't deal with 2 level gatt's */
991                 return -EINVAL;
992                 break;
993         default:
994                 page_order = 0;
995                 break;
996         }
997
998         /* Do not worry about freeing memory, because if this is
999          * called, then all agp memory is deallocated and removed
1000          * from the table. */
1001
1002 #ifdef CONFIG_X86
1003         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1004 #else
1005         iounmap(bridge->gatt_table);
1006 #endif
1007         table = (char *) bridge->gatt_table_real;
1008         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1009
1010         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1011                 ClearPageReserved(page);
1012
1013         free_gatt_pages(bridge->gatt_table_real, page_order);
1014
1015         agp_gatt_table = NULL;
1016         bridge->gatt_table = NULL;
1017         bridge->gatt_table_real = NULL;
1018         bridge->gatt_bus_addr = 0;
1019
1020         return 0;
1021 }
1022 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1023
1024
1025 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1026 {
1027         int num_entries;
1028         size_t i;
1029         off_t j;
1030         void *temp;
1031         struct agp_bridge_data *bridge;
1032         int mask_type;
1033
1034         bridge = mem->bridge;
1035         if (!bridge)
1036                 return -EINVAL;
1037
1038         if (mem->page_count == 0)
1039                 return 0;
1040
1041         temp = bridge->current_size;
1042
1043         switch (bridge->driver->size_type) {
1044         case U8_APER_SIZE:
1045                 num_entries = A_SIZE_8(temp)->num_entries;
1046                 break;
1047         case U16_APER_SIZE:
1048                 num_entries = A_SIZE_16(temp)->num_entries;
1049                 break;
1050         case U32_APER_SIZE:
1051                 num_entries = A_SIZE_32(temp)->num_entries;
1052                 break;
1053         case FIXED_APER_SIZE:
1054                 num_entries = A_SIZE_FIX(temp)->num_entries;
1055                 break;
1056         case LVL2_APER_SIZE:
1057                 /* The generic routines can't deal with 2 level gatt's */
1058                 return -EINVAL;
1059                 break;
1060         default:
1061                 num_entries = 0;
1062                 break;
1063         }
1064
1065         num_entries -= agp_memory_reserved/PAGE_SIZE;
1066         if (num_entries < 0) num_entries = 0;
1067
1068         if (type != mem->type)
1069                 return -EINVAL;
1070
1071         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1072         if (mask_type != 0) {
1073                 /* The generic routines know nothing of memory types */
1074                 return -EINVAL;
1075         }
1076
1077         /* AK: could wrap */
1078         if ((pg_start + mem->page_count) > num_entries)
1079                 return -EINVAL;
1080
1081         j = pg_start;
1082
1083         while (j < (pg_start + mem->page_count)) {
1084                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1085                         return -EBUSY;
1086                 j++;
1087         }
1088
1089         if (!mem->is_flushed) {
1090                 bridge->driver->cache_flush();
1091                 mem->is_flushed = true;
1092         }
1093
1094         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1095                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mask_type),
1096                        bridge->gatt_table+j);
1097         }
1098         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1099
1100         bridge->driver->tlb_flush(mem);
1101         return 0;
1102 }
1103 EXPORT_SYMBOL(agp_generic_insert_memory);
1104
1105
1106 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1107 {
1108         size_t i;
1109         struct agp_bridge_data *bridge;
1110         int mask_type;
1111
1112         bridge = mem->bridge;
1113         if (!bridge)
1114                 return -EINVAL;
1115
1116         if (mem->page_count == 0)
1117                 return 0;
1118
1119         if (type != mem->type)
1120                 return -EINVAL;
1121
1122         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1123         if (mask_type != 0) {
1124                 /* The generic routines know nothing of memory types */
1125                 return -EINVAL;
1126         }
1127
1128         /* AK: bogus, should encode addresses > 4GB */
1129         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1130                 writel(bridge->scratch_page, bridge->gatt_table+i);
1131         }
1132         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1133
1134         bridge->driver->tlb_flush(mem);
1135         return 0;
1136 }
1137 EXPORT_SYMBOL(agp_generic_remove_memory);
1138
1139 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1140 {
1141         return NULL;
1142 }
1143 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1144
1145 void agp_generic_free_by_type(struct agp_memory *curr)
1146 {
1147         agp_free_page_array(curr);
1148         agp_free_key(curr->key);
1149         kfree(curr);
1150 }
1151 EXPORT_SYMBOL(agp_generic_free_by_type);
1152
1153 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1154 {
1155         struct agp_memory *new;
1156         int i;
1157         int pages;
1158
1159         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1160         new = agp_create_user_memory(page_count);
1161         if (new == NULL)
1162                 return NULL;
1163
1164         for (i = 0; i < page_count; i++)
1165                 new->memory[i] = 0;
1166         new->page_count = 0;
1167         new->type = type;
1168         new->num_scratch_pages = pages;
1169
1170         return new;
1171 }
1172 EXPORT_SYMBOL(agp_generic_alloc_user);
1173
1174 /*
1175  * Basic Page Allocation Routines -
1176  * These routines handle page allocation and by default they reserve the allocated
1177  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1178  * against a maximum value.
1179  */
1180
1181 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1182 {
1183         struct page * page;
1184
1185         page = alloc_page(GFP_KERNEL | GFP_DMA32);
1186         if (page == NULL)
1187                 return NULL;
1188
1189         map_page_into_agp(page);
1190
1191         get_page(page);
1192         atomic_inc(&agp_bridge->current_memory_agp);
1193         return page_address(page);
1194 }
1195 EXPORT_SYMBOL(agp_generic_alloc_page);
1196
1197
1198 void agp_generic_destroy_page(void *addr, int flags)
1199 {
1200         struct page *page;
1201
1202         if (addr == NULL)
1203                 return;
1204
1205         page = virt_to_page(addr);
1206         if (flags & AGP_PAGE_DESTROY_UNMAP)
1207                 unmap_page_from_agp(page);
1208
1209         if (flags & AGP_PAGE_DESTROY_FREE) {
1210                 put_page(page);
1211                 free_page((unsigned long)addr);
1212                 atomic_dec(&agp_bridge->current_memory_agp);
1213         }
1214 }
1215 EXPORT_SYMBOL(agp_generic_destroy_page);
1216
1217 /* End Basic Page Allocation Routines */
1218
1219
1220 /**
1221  * agp_enable  -  initialise the agp point-to-point connection.
1222  *
1223  * @mode:       agp mode register value to configure with.
1224  */
1225 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1226 {
1227         if (!bridge)
1228                 return;
1229         bridge->driver->agp_enable(bridge, mode);
1230 }
1231 EXPORT_SYMBOL(agp_enable);
1232
1233 /* When we remove the global variable agp_bridge from all drivers
1234  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1235  */
1236
1237 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1238 {
1239         if (list_empty(&agp_bridges))
1240                 return NULL;
1241
1242         return agp_bridge;
1243 }
1244
1245 static void ipi_handler(void *null)
1246 {
1247         flush_agp_cache();
1248 }
1249
1250 void global_cache_flush(void)
1251 {
1252         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1253                 panic(PFX "timed out waiting for the other CPUs!\n");
1254 }
1255 EXPORT_SYMBOL(global_cache_flush);
1256
1257 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1258         unsigned long addr, int type)
1259 {
1260         /* memory type is ignored in the generic routine */
1261         if (bridge->driver->masks)
1262                 return addr | bridge->driver->masks[0].mask;
1263         else
1264                 return addr;
1265 }
1266 EXPORT_SYMBOL(agp_generic_mask_memory);
1267
1268 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1269                                   int type)
1270 {
1271         if (type >= AGP_USER_TYPES)
1272                 return 0;
1273         return type;
1274 }
1275 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1276
1277 /*
1278  * These functions are implemented according to the AGPv3 spec,
1279  * which covers implementation details that had previously been
1280  * left open.
1281  */
1282
1283 int agp3_generic_fetch_size(void)
1284 {
1285         u16 temp_size;
1286         int i;
1287         struct aper_size_info_16 *values;
1288
1289         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1290         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1291
1292         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1293                 if (temp_size == values[i].size_value) {
1294                         agp_bridge->previous_size =
1295                                 agp_bridge->current_size = (void *) (values + i);
1296
1297                         agp_bridge->aperture_size_idx = i;
1298                         return values[i].size;
1299                 }
1300         }
1301         return 0;
1302 }
1303 EXPORT_SYMBOL(agp3_generic_fetch_size);
1304
1305 void agp3_generic_tlbflush(struct agp_memory *mem)
1306 {
1307         u32 ctrl;
1308         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1309         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1310         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1311 }
1312 EXPORT_SYMBOL(agp3_generic_tlbflush);
1313
1314 int agp3_generic_configure(void)
1315 {
1316         u32 temp;
1317         struct aper_size_info_16 *current_size;
1318
1319         current_size = A_SIZE_16(agp_bridge->current_size);
1320
1321         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1322         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1323
1324         /* set aperture size */
1325         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1326         /* set gart pointer */
1327         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1328         /* enable aperture and GTLB */
1329         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1330         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1331         return 0;
1332 }
1333 EXPORT_SYMBOL(agp3_generic_configure);
1334
1335 void agp3_generic_cleanup(void)
1336 {
1337         u32 ctrl;
1338         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1339         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1340 }
1341 EXPORT_SYMBOL(agp3_generic_cleanup);
1342
1343 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1344 {
1345         {4096, 1048576, 10,0x000},
1346         {2048,  524288, 9, 0x800},
1347         {1024,  262144, 8, 0xc00},
1348         { 512,  131072, 7, 0xe00},
1349         { 256,   65536, 6, 0xf00},
1350         { 128,   32768, 5, 0xf20},
1351         {  64,   16384, 4, 0xf30},
1352         {  32,    8192, 3, 0xf38},
1353         {  16,    4096, 2, 0xf3c},
1354         {   8,    2048, 1, 0xf3e},
1355         {   4,    1024, 0, 0xf3f}
1356 };
1357 EXPORT_SYMBOL(agp3_generic_sizes);
1358