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