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