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