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