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