Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux-2.6.git] / 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 <linux/slab.h>
42 #include <asm/io.h>
43 #include <asm/cacheflush.h>
44 #include <asm/pgtable.h>
45 #include "agp.h"
46
47 __u32 *agp_gatt_table;
48 int agp_memory_reserved;
49
50 /*
51  * Needed by the Nforce GART driver for the time being. Would be
52  * nice to do this some other way instead of needing this export.
53  */
54 EXPORT_SYMBOL_GPL(agp_memory_reserved);
55
56 /*
57  * Generic routines for handling agp_memory structures -
58  * They use the basic page allocation routines to do the brunt of the work.
59  */
60
61 void agp_free_key(int key)
62 {
63         if (key < 0)
64                 return;
65
66         if (key < MAXKEY)
67                 clear_bit(key, agp_bridge->key_list);
68 }
69 EXPORT_SYMBOL(agp_free_key);
70
71
72 static int agp_get_key(void)
73 {
74         int bit;
75
76         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
77         if (bit < MAXKEY) {
78                 set_bit(bit, agp_bridge->key_list);
79                 return bit;
80         }
81         return -1;
82 }
83
84 void agp_flush_chipset(struct agp_bridge_data *bridge)
85 {
86         if (bridge->driver->chipset_flush)
87                 bridge->driver->chipset_flush(bridge);
88 }
89 EXPORT_SYMBOL(agp_flush_chipset);
90
91 /*
92  * Use kmalloc if possible for the page list. Otherwise fall back to
93  * vmalloc. This speeds things up and also saves memory for small AGP
94  * regions.
95  */
96
97 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
98 {
99         mem->pages = NULL;
100
101         if (size <= 2*PAGE_SIZE)
102                 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
103         if (mem->pages == NULL) {
104                 mem->pages = vmalloc(size);
105         }
106 }
107 EXPORT_SYMBOL(agp_alloc_page_array);
108
109 void agp_free_page_array(struct agp_memory *mem)
110 {
111         if (is_vmalloc_addr(mem->pages)) {
112                 vfree(mem->pages);
113         } else {
114                 kfree(mem->pages);
115         }
116 }
117 EXPORT_SYMBOL(agp_free_page_array);
118
119
120 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
121 {
122         struct agp_memory *new;
123         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
124
125         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
126         if (new == NULL)
127                 return NULL;
128
129         new->key = agp_get_key();
130
131         if (new->key < 0) {
132                 kfree(new);
133                 return NULL;
134         }
135
136         agp_alloc_page_array(alloc_size, new);
137
138         if (new->pages == NULL) {
139                 agp_free_key(new->key);
140                 kfree(new);
141                 return NULL;
142         }
143         new->num_scratch_pages = 0;
144         return new;
145 }
146
147 struct agp_memory *agp_create_memory(int scratch_pages)
148 {
149         struct agp_memory *new;
150
151         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
152         if (new == NULL)
153                 return NULL;
154
155         new->key = agp_get_key();
156
157         if (new->key < 0) {
158                 kfree(new);
159                 return NULL;
160         }
161
162         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
163
164         if (new->pages == NULL) {
165                 agp_free_key(new->key);
166                 kfree(new);
167                 return NULL;
168         }
169         new->num_scratch_pages = scratch_pages;
170         new->type = AGP_NORMAL_MEMORY;
171         return new;
172 }
173 EXPORT_SYMBOL(agp_create_memory);
174
175 /**
176  *      agp_free_memory - free memory associated with an agp_memory pointer.
177  *
178  *      @curr:          agp_memory pointer to be freed.
179  *
180  *      It is the only function that can be called when the backend is not owned
181  *      by the caller.  (So it can free memory on client death.)
182  */
183 void agp_free_memory(struct agp_memory *curr)
184 {
185         size_t i;
186
187         if (curr == NULL)
188                 return;
189
190         if (curr->is_bound)
191                 agp_unbind_memory(curr);
192
193         if (curr->type >= AGP_USER_TYPES) {
194                 agp_generic_free_by_type(curr);
195                 return;
196         }
197
198         if (curr->type != 0) {
199                 curr->bridge->driver->free_by_type(curr);
200                 return;
201         }
202         if (curr->page_count != 0) {
203                 if (curr->bridge->driver->agp_destroy_pages) {
204                         curr->bridge->driver->agp_destroy_pages(curr);
205                 } else {
206
207                         for (i = 0; i < curr->page_count; i++) {
208                                 curr->bridge->driver->agp_destroy_page(
209                                         curr->pages[i],
210                                         AGP_PAGE_DESTROY_UNMAP);
211                         }
212                         for (i = 0; i < curr->page_count; i++) {
213                                 curr->bridge->driver->agp_destroy_page(
214                                         curr->pages[i],
215                                         AGP_PAGE_DESTROY_FREE);
216                         }
217                 }
218         }
219         agp_free_key(curr->key);
220         agp_free_page_array(curr);
221         kfree(curr);
222 }
223 EXPORT_SYMBOL(agp_free_memory);
224
225 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
226
227 /**
228  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
229  *
230  *      @page_count:    size_t argument of the number of pages
231  *      @type:  u32 argument of the type of memory to be allocated.
232  *
233  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
234  *      maps to physical ram.  Any other type is device dependent.
235  *
236  *      It returns NULL whenever memory is unavailable.
237  */
238 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
239                                         size_t page_count, u32 type)
240 {
241         int scratch_pages;
242         struct agp_memory *new;
243         size_t i;
244
245         if (!bridge)
246                 return NULL;
247
248         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
249                 return NULL;
250
251         if (type >= AGP_USER_TYPES) {
252                 new = agp_generic_alloc_user(page_count, type);
253                 if (new)
254                         new->bridge = bridge;
255                 return new;
256         }
257
258         if (type != 0) {
259                 new = bridge->driver->alloc_by_type(page_count, type);
260                 if (new)
261                         new->bridge = bridge;
262                 return new;
263         }
264
265         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
266
267         new = agp_create_memory(scratch_pages);
268
269         if (new == NULL)
270                 return NULL;
271
272         if (bridge->driver->agp_alloc_pages) {
273                 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
274                         agp_free_memory(new);
275                         return NULL;
276                 }
277                 new->bridge = bridge;
278                 return new;
279         }
280
281         for (i = 0; i < page_count; i++) {
282                 struct page *page = bridge->driver->agp_alloc_page(bridge);
283
284                 if (page == NULL) {
285                         agp_free_memory(new);
286                         return NULL;
287                 }
288                 new->pages[i] = page;
289                 new->page_count++;
290         }
291         new->bridge = bridge;
292
293         return new;
294 }
295 EXPORT_SYMBOL(agp_allocate_memory);
296
297
298 /* End - Generic routines for handling agp_memory structures */
299
300
301 static int agp_return_size(void)
302 {
303         int current_size;
304         void *temp;
305
306         temp = agp_bridge->current_size;
307
308         switch (agp_bridge->driver->size_type) {
309         case U8_APER_SIZE:
310                 current_size = A_SIZE_8(temp)->size;
311                 break;
312         case U16_APER_SIZE:
313                 current_size = A_SIZE_16(temp)->size;
314                 break;
315         case U32_APER_SIZE:
316                 current_size = A_SIZE_32(temp)->size;
317                 break;
318         case LVL2_APER_SIZE:
319                 current_size = A_SIZE_LVL2(temp)->size;
320                 break;
321         case FIXED_APER_SIZE:
322                 current_size = A_SIZE_FIX(temp)->size;
323                 break;
324         default:
325                 current_size = 0;
326                 break;
327         }
328
329         current_size -= (agp_memory_reserved / (1024*1024));
330         if (current_size <0)
331                 current_size = 0;
332         return current_size;
333 }
334
335
336 int agp_num_entries(void)
337 {
338         int num_entries;
339         void *temp;
340
341         temp = agp_bridge->current_size;
342
343         switch (agp_bridge->driver->size_type) {
344         case U8_APER_SIZE:
345                 num_entries = A_SIZE_8(temp)->num_entries;
346                 break;
347         case U16_APER_SIZE:
348                 num_entries = A_SIZE_16(temp)->num_entries;
349                 break;
350         case U32_APER_SIZE:
351                 num_entries = A_SIZE_32(temp)->num_entries;
352                 break;
353         case LVL2_APER_SIZE:
354                 num_entries = A_SIZE_LVL2(temp)->num_entries;
355                 break;
356         case FIXED_APER_SIZE:
357                 num_entries = A_SIZE_FIX(temp)->num_entries;
358                 break;
359         default:
360                 num_entries = 0;
361                 break;
362         }
363
364         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
365         if (num_entries<0)
366                 num_entries = 0;
367         return num_entries;
368 }
369 EXPORT_SYMBOL_GPL(agp_num_entries);
370
371
372 /**
373  *      agp_copy_info  -  copy bridge state information
374  *
375  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
376  *
377  *      This function copies information about the agp bridge device and the state of
378  *      the agp backend into an agp_kern_info pointer.
379  */
380 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
381 {
382         memset(info, 0, sizeof(struct agp_kern_info));
383         if (!bridge) {
384                 info->chipset = NOT_SUPPORTED;
385                 return -EIO;
386         }
387
388         info->version.major = bridge->version->major;
389         info->version.minor = bridge->version->minor;
390         info->chipset = SUPPORTED;
391         info->device = bridge->dev;
392         if (bridge->mode & AGPSTAT_MODE_3_0)
393                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
394         else
395                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
396         info->aper_base = bridge->gart_bus_addr;
397         info->aper_size = agp_return_size();
398         info->max_memory = bridge->max_memory_agp;
399         info->current_memory = atomic_read(&bridge->current_memory_agp);
400         info->cant_use_aperture = bridge->driver->cant_use_aperture;
401         info->vm_ops = bridge->vm_ops;
402         info->page_mask = ~0UL;
403         return 0;
404 }
405 EXPORT_SYMBOL(agp_copy_info);
406
407 /* End - Routine to copy over information structure */
408
409 /*
410  * Routines for handling swapping of agp_memory into the GATT -
411  * These routines take agp_memory and insert them into the GATT.
412  * They call device specific routines to actually write to the GATT.
413  */
414
415 /**
416  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
417  *
418  *      @curr:          agp_memory pointer
419  *      @pg_start:      an offset into the graphics aperture translation table
420  *
421  *      It returns -EINVAL if the pointer == NULL.
422  *      It returns -EBUSY if the area of the table requested is already in use.
423  */
424 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
425 {
426         int ret_val;
427
428         if (curr == NULL)
429                 return -EINVAL;
430
431         if (curr->is_bound) {
432                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
433                 return -EINVAL;
434         }
435         if (!curr->is_flushed) {
436                 curr->bridge->driver->cache_flush();
437                 curr->is_flushed = true;
438         }
439
440         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
441
442         if (ret_val != 0)
443                 return ret_val;
444
445         curr->is_bound = true;
446         curr->pg_start = pg_start;
447         spin_lock(&agp_bridge->mapped_lock);
448         list_add(&curr->mapped_list, &agp_bridge->mapped_list);
449         spin_unlock(&agp_bridge->mapped_lock);
450
451         return 0;
452 }
453 EXPORT_SYMBOL(agp_bind_memory);
454
455
456 /**
457  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
458  *
459  * @curr:       agp_memory pointer to be removed from the GATT.
460  *
461  * It returns -EINVAL if this piece of agp_memory is not currently bound to
462  * the graphics aperture translation table or if the agp_memory pointer == NULL
463  */
464 int agp_unbind_memory(struct agp_memory *curr)
465 {
466         int ret_val;
467
468         if (curr == NULL)
469                 return -EINVAL;
470
471         if (!curr->is_bound) {
472                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
473                 return -EINVAL;
474         }
475
476         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
477
478         if (ret_val != 0)
479                 return ret_val;
480
481         curr->is_bound = false;
482         curr->pg_start = 0;
483         spin_lock(&curr->bridge->mapped_lock);
484         list_del(&curr->mapped_list);
485         spin_unlock(&curr->bridge->mapped_lock);
486         return 0;
487 }
488 EXPORT_SYMBOL(agp_unbind_memory);
489
490 /**
491  *      agp_rebind_emmory  -  Rewrite the entire GATT, useful on resume
492  */
493 int agp_rebind_memory(void)
494 {
495         struct agp_memory *curr;
496         int ret_val = 0;
497
498         spin_lock(&agp_bridge->mapped_lock);
499         list_for_each_entry(curr, &agp_bridge->mapped_list, mapped_list) {
500                 ret_val = curr->bridge->driver->insert_memory(curr,
501                                                               curr->pg_start,
502                                                               curr->type);
503                 if (ret_val != 0)
504                         break;
505         }
506         spin_unlock(&agp_bridge->mapped_lock);
507         return ret_val;
508 }
509 EXPORT_SYMBOL(agp_rebind_memory);
510
511 /* End - Routines for handling swapping of agp_memory into the GATT */
512
513
514 /* Generic Agp routines - Start */
515 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
516 {
517         u32 tmp;
518
519         if (*requested_mode & AGP2_RESERVED_MASK) {
520                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
521                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
522                 *requested_mode &= ~AGP2_RESERVED_MASK;
523         }
524
525         /*
526          * Some dumb bridges are programmed to disobey the AGP2 spec.
527          * This is likely a BIOS misprogramming rather than poweron default, or
528          * it would be a lot more common.
529          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
530          * AGPv2 spec 6.1.9 states:
531          *   The RATE field indicates the data transfer rates supported by this
532          *   device. A.G.P. devices must report all that apply.
533          * Fix them up as best we can.
534          */
535         switch (*bridge_agpstat & 7) {
536         case 4:
537                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
538                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
539                         "Fixing up support for x2 & x1\n");
540                 break;
541         case 2:
542                 *bridge_agpstat |= AGPSTAT2_1X;
543                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
544                         "Fixing up support for x1\n");
545                 break;
546         default:
547                 break;
548         }
549
550         /* Check the speed bits make sense. Only one should be set. */
551         tmp = *requested_mode & 7;
552         switch (tmp) {
553                 case 0:
554                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
555                         *requested_mode |= AGPSTAT2_1X;
556                         break;
557                 case 1:
558                 case 2:
559                         break;
560                 case 3:
561                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
562                         break;
563                 case 4:
564                         break;
565                 case 5:
566                 case 6:
567                 case 7:
568                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
569                         break;
570         }
571
572         /* disable SBA if it's not supported */
573         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
574                 *bridge_agpstat &= ~AGPSTAT_SBA;
575
576         /* Set rate */
577         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
578                 *bridge_agpstat &= ~AGPSTAT2_4X;
579
580         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
581                 *bridge_agpstat &= ~AGPSTAT2_2X;
582
583         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
584                 *bridge_agpstat &= ~AGPSTAT2_1X;
585
586         /* Now we know what mode it should be, clear out the unwanted bits. */
587         if (*bridge_agpstat & AGPSTAT2_4X)
588                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
589
590         if (*bridge_agpstat & AGPSTAT2_2X)
591                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
592
593         if (*bridge_agpstat & AGPSTAT2_1X)
594                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
595
596         /* Apply any errata. */
597         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
598                 *bridge_agpstat &= ~AGPSTAT_FW;
599
600         if (agp_bridge->flags & AGP_ERRATA_SBA)
601                 *bridge_agpstat &= ~AGPSTAT_SBA;
602
603         if (agp_bridge->flags & AGP_ERRATA_1X) {
604                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
605                 *bridge_agpstat |= AGPSTAT2_1X;
606         }
607
608         /* If we've dropped down to 1X, disable fast writes. */
609         if (*bridge_agpstat & AGPSTAT2_1X)
610                 *bridge_agpstat &= ~AGPSTAT_FW;
611 }
612
613 /*
614  * requested_mode = Mode requested by (typically) X.
615  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
616  * vga_agpstat = PCI_AGP_STATUS from graphic card.
617  */
618 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
619 {
620         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
621         u32 tmp;
622
623         if (*requested_mode & AGP3_RESERVED_MASK) {
624                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
625                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
626                 *requested_mode &= ~AGP3_RESERVED_MASK;
627         }
628
629         /* Check the speed bits make sense. */
630         tmp = *requested_mode & 7;
631         if (tmp == 0) {
632                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
633                 *requested_mode |= AGPSTAT3_4X;
634         }
635         if (tmp >= 3) {
636                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
637                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
638         }
639
640         /* ARQSZ - Set the value to the maximum one.
641          * Don't allow the mode register to override values. */
642         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
643                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
644
645         /* Calibration cycle.
646          * Don't allow the mode register to override values. */
647         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
648                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
649
650         /* SBA *must* be supported for AGP v3 */
651         *bridge_agpstat |= AGPSTAT_SBA;
652
653         /*
654          * Set speed.
655          * Check for invalid speeds. This can happen when applications
656          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
657          */
658         if (*requested_mode & AGPSTAT_MODE_3_0) {
659                 /*
660                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
661                  * have been passed a 3.0 mode, but with 2.x speed bits set.
662                  * AGP2.x 4x -> AGP3.0 4x.
663                  */
664                 if (*requested_mode & AGPSTAT2_4X) {
665                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
666                                                 current->comm, *requested_mode);
667                         *requested_mode &= ~AGPSTAT2_4X;
668                         *requested_mode |= AGPSTAT3_4X;
669                 }
670         } else {
671                 /*
672                  * The caller doesn't know what they are doing. We are in 3.0 mode,
673                  * but have been passed an AGP 2.x mode.
674                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
675                  */
676                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
677                                         current->comm, *requested_mode);
678                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
679                 *requested_mode |= AGPSTAT3_4X;
680         }
681
682         if (*requested_mode & AGPSTAT3_8X) {
683                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
684                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
685                         *bridge_agpstat |= AGPSTAT3_4X;
686                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
687                         return;
688                 }
689                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
690                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
691                         *bridge_agpstat |= AGPSTAT3_4X;
692                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
693                         return;
694                 }
695                 /* All set, bridge & device can do AGP x8*/
696                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
697                 goto done;
698
699         } else if (*requested_mode & AGPSTAT3_4X) {
700                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
701                 *bridge_agpstat |= AGPSTAT3_4X;
702                 goto done;
703
704         } else {
705
706                 /*
707                  * If we didn't specify an AGP mode, we see if both
708                  * the graphics card, and the bridge can do x8, and use if so.
709                  * If not, we fall back to x4 mode.
710                  */
711                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
712                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
713                                 "supported by bridge & card (x8).\n");
714                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
715                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
716                 } else {
717                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
718                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
719                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
720                                         *bridge_agpstat, origbridge);
721                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
722                                 *bridge_agpstat |= AGPSTAT3_4X;
723                         }
724                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
725                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
726                                         *vga_agpstat, origvga);
727                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
728                                 *vga_agpstat |= AGPSTAT3_4X;
729                         }
730                 }
731         }
732
733 done:
734         /* Apply any errata. */
735         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
736                 *bridge_agpstat &= ~AGPSTAT_FW;
737
738         if (agp_bridge->flags & AGP_ERRATA_SBA)
739                 *bridge_agpstat &= ~AGPSTAT_SBA;
740
741         if (agp_bridge->flags & AGP_ERRATA_1X) {
742                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
743                 *bridge_agpstat |= AGPSTAT2_1X;
744         }
745 }
746
747
748 /**
749  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
750  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
751  * @requested_mode: requested agp_stat from userspace (Typically from X)
752  * @bridge_agpstat: current agp_stat from AGP bridge.
753  *
754  * This function will hunt for an AGP graphics card, and try to match
755  * the requested mode to the capabilities of both the bridge and the card.
756  */
757 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
758 {
759         struct pci_dev *device = NULL;
760         u32 vga_agpstat;
761         u8 cap_ptr;
762
763         for (;;) {
764                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
765                 if (!device) {
766                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
767                         return 0;
768                 }
769                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
770                 if (cap_ptr)
771                         break;
772         }
773
774         /*
775          * Ok, here we have a AGP device. Disable impossible
776          * settings, and adjust the readqueue to the minimum.
777          */
778         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
779
780         /* adjust RQ depth */
781         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
782              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
783                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
784
785         /* disable FW if it's not supported */
786         if (!((bridge_agpstat & AGPSTAT_FW) &&
787                  (vga_agpstat & AGPSTAT_FW) &&
788                  (requested_mode & AGPSTAT_FW)))
789                 bridge_agpstat &= ~AGPSTAT_FW;
790
791         /* Check to see if we are operating in 3.0 mode */
792         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
793                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
794         else
795                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
796
797         pci_dev_put(device);
798         return bridge_agpstat;
799 }
800 EXPORT_SYMBOL(agp_collect_device_status);
801
802
803 void agp_device_command(u32 bridge_agpstat, bool agp_v3)
804 {
805         struct pci_dev *device = NULL;
806         int mode;
807
808         mode = bridge_agpstat & 0x7;
809         if (agp_v3)
810                 mode *= 4;
811
812         for_each_pci_dev(device) {
813                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
814                 if (!agp)
815                         continue;
816
817                 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
818                          agp_v3 ? 3 : 2, mode);
819                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
820         }
821 }
822 EXPORT_SYMBOL(agp_device_command);
823
824
825 void get_agp_version(struct agp_bridge_data *bridge)
826 {
827         u32 ncapid;
828
829         /* Exit early if already set by errata workarounds. */
830         if (bridge->major_version != 0)
831                 return;
832
833         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
834         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
835         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
836 }
837 EXPORT_SYMBOL(get_agp_version);
838
839
840 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
841 {
842         u32 bridge_agpstat, temp;
843
844         get_agp_version(agp_bridge);
845
846         dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
847                  agp_bridge->major_version, agp_bridge->minor_version);
848
849         pci_read_config_dword(agp_bridge->dev,
850                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
851
852         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
853         if (bridge_agpstat == 0)
854                 /* Something bad happened. FIXME: Return error code? */
855                 return;
856
857         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
858
859         /* Do AGP version specific frobbing. */
860         if (bridge->major_version >= 3) {
861                 if (bridge->mode & AGPSTAT_MODE_3_0) {
862                         /* If we have 3.5, we can do the isoch stuff. */
863                         if (bridge->minor_version >= 5)
864                                 agp_3_5_enable(bridge);
865                         agp_device_command(bridge_agpstat, true);
866                         return;
867                 } else {
868                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
869                     bridge_agpstat &= ~(7<<10) ;
870                     pci_read_config_dword(bridge->dev,
871                                         bridge->capndx+AGPCTRL, &temp);
872                     temp |= (1<<9);
873                     pci_write_config_dword(bridge->dev,
874                                         bridge->capndx+AGPCTRL, temp);
875
876                     dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
877                 }
878         }
879
880         /* AGP v<3 */
881         agp_device_command(bridge_agpstat, false);
882 }
883 EXPORT_SYMBOL(agp_generic_enable);
884
885
886 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
887 {
888         char *table;
889         char *table_end;
890         int size;
891         int page_order;
892         int num_entries;
893         int i;
894         void *temp;
895         struct page *page;
896
897         /* The generic routines can't handle 2 level gatt's */
898         if (bridge->driver->size_type == LVL2_APER_SIZE)
899                 return -EINVAL;
900
901         table = NULL;
902         i = bridge->aperture_size_idx;
903         temp = bridge->current_size;
904         size = page_order = num_entries = 0;
905
906         if (bridge->driver->size_type != FIXED_APER_SIZE) {
907                 do {
908                         switch (bridge->driver->size_type) {
909                         case U8_APER_SIZE:
910                                 size = A_SIZE_8(temp)->size;
911                                 page_order =
912                                     A_SIZE_8(temp)->page_order;
913                                 num_entries =
914                                     A_SIZE_8(temp)->num_entries;
915                                 break;
916                         case U16_APER_SIZE:
917                                 size = A_SIZE_16(temp)->size;
918                                 page_order = A_SIZE_16(temp)->page_order;
919                                 num_entries = A_SIZE_16(temp)->num_entries;
920                                 break;
921                         case U32_APER_SIZE:
922                                 size = A_SIZE_32(temp)->size;
923                                 page_order = A_SIZE_32(temp)->page_order;
924                                 num_entries = A_SIZE_32(temp)->num_entries;
925                                 break;
926                                 /* This case will never really happen. */
927                         case FIXED_APER_SIZE:
928                         case LVL2_APER_SIZE:
929                         default:
930                                 size = page_order = num_entries = 0;
931                                 break;
932                         }
933
934                         table = alloc_gatt_pages(page_order);
935
936                         if (table == NULL) {
937                                 i++;
938                                 switch (bridge->driver->size_type) {
939                                 case U8_APER_SIZE:
940                                         bridge->current_size = A_IDX8(bridge);
941                                         break;
942                                 case U16_APER_SIZE:
943                                         bridge->current_size = A_IDX16(bridge);
944                                         break;
945                                 case U32_APER_SIZE:
946                                         bridge->current_size = A_IDX32(bridge);
947                                         break;
948                                 /* These cases will never really happen. */
949                                 case FIXED_APER_SIZE:
950                                 case LVL2_APER_SIZE:
951                                 default:
952                                         break;
953                                 }
954                                 temp = bridge->current_size;
955                         } else {
956                                 bridge->aperture_size_idx = i;
957                         }
958                 } while (!table && (i < bridge->driver->num_aperture_sizes));
959         } else {
960                 size = ((struct aper_size_info_fixed *) temp)->size;
961                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
962                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
963                 table = alloc_gatt_pages(page_order);
964         }
965
966         if (table == NULL)
967                 return -ENOMEM;
968
969         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
970
971         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
972                 SetPageReserved(page);
973
974         bridge->gatt_table_real = (u32 *) table;
975         agp_gatt_table = (void *)table;
976
977         bridge->driver->cache_flush();
978 #ifdef CONFIG_X86
979         if (set_memory_uc((unsigned long)table, 1 << page_order))
980                 printk(KERN_WARNING "Could not set GATT table memory to UC!");
981
982         bridge->gatt_table = (void *)table;
983 #else
984         bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
985                                         (PAGE_SIZE * (1 << page_order)));
986         bridge->driver->cache_flush();
987 #endif
988
989         if (bridge->gatt_table == NULL) {
990                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
991                         ClearPageReserved(page);
992
993                 free_gatt_pages(table, page_order);
994
995                 return -ENOMEM;
996         }
997         bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
998
999         /* AK: bogus, should encode addresses > 4GB */
1000         for (i = 0; i < num_entries; i++) {
1001                 writel(bridge->scratch_page, bridge->gatt_table+i);
1002                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1003         }
1004
1005         return 0;
1006 }
1007 EXPORT_SYMBOL(agp_generic_create_gatt_table);
1008
1009 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
1010 {
1011         int page_order;
1012         char *table, *table_end;
1013         void *temp;
1014         struct page *page;
1015
1016         temp = bridge->current_size;
1017
1018         switch (bridge->driver->size_type) {
1019         case U8_APER_SIZE:
1020                 page_order = A_SIZE_8(temp)->page_order;
1021                 break;
1022         case U16_APER_SIZE:
1023                 page_order = A_SIZE_16(temp)->page_order;
1024                 break;
1025         case U32_APER_SIZE:
1026                 page_order = A_SIZE_32(temp)->page_order;
1027                 break;
1028         case FIXED_APER_SIZE:
1029                 page_order = A_SIZE_FIX(temp)->page_order;
1030                 break;
1031         case LVL2_APER_SIZE:
1032                 /* The generic routines can't deal with 2 level gatt's */
1033                 return -EINVAL;
1034                 break;
1035         default:
1036                 page_order = 0;
1037                 break;
1038         }
1039
1040         /* Do not worry about freeing memory, because if this is
1041          * called, then all agp memory is deallocated and removed
1042          * from the table. */
1043
1044 #ifdef CONFIG_X86
1045         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1046 #else
1047         iounmap(bridge->gatt_table);
1048 #endif
1049         table = (char *) bridge->gatt_table_real;
1050         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1051
1052         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1053                 ClearPageReserved(page);
1054
1055         free_gatt_pages(bridge->gatt_table_real, page_order);
1056
1057         agp_gatt_table = NULL;
1058         bridge->gatt_table = NULL;
1059         bridge->gatt_table_real = NULL;
1060         bridge->gatt_bus_addr = 0;
1061
1062         return 0;
1063 }
1064 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1065
1066
1067 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1068 {
1069         int num_entries;
1070         size_t i;
1071         off_t j;
1072         void *temp;
1073         struct agp_bridge_data *bridge;
1074         int mask_type;
1075
1076         bridge = mem->bridge;
1077         if (!bridge)
1078                 return -EINVAL;
1079
1080         if (mem->page_count == 0)
1081                 return 0;
1082
1083         temp = bridge->current_size;
1084
1085         switch (bridge->driver->size_type) {
1086         case U8_APER_SIZE:
1087                 num_entries = A_SIZE_8(temp)->num_entries;
1088                 break;
1089         case U16_APER_SIZE:
1090                 num_entries = A_SIZE_16(temp)->num_entries;
1091                 break;
1092         case U32_APER_SIZE:
1093                 num_entries = A_SIZE_32(temp)->num_entries;
1094                 break;
1095         case FIXED_APER_SIZE:
1096                 num_entries = A_SIZE_FIX(temp)->num_entries;
1097                 break;
1098         case LVL2_APER_SIZE:
1099                 /* The generic routines can't deal with 2 level gatt's */
1100                 return -EINVAL;
1101                 break;
1102         default:
1103                 num_entries = 0;
1104                 break;
1105         }
1106
1107         num_entries -= agp_memory_reserved/PAGE_SIZE;
1108         if (num_entries < 0) num_entries = 0;
1109
1110         if (type != mem->type)
1111                 return -EINVAL;
1112
1113         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1114         if (mask_type != 0) {
1115                 /* The generic routines know nothing of memory types */
1116                 return -EINVAL;
1117         }
1118
1119         /* AK: could wrap */
1120         if ((pg_start + mem->page_count) > num_entries)
1121                 return -EINVAL;
1122
1123         j = pg_start;
1124
1125         while (j < (pg_start + mem->page_count)) {
1126                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1127                         return -EBUSY;
1128                 j++;
1129         }
1130
1131         if (!mem->is_flushed) {
1132                 bridge->driver->cache_flush();
1133                 mem->is_flushed = true;
1134         }
1135
1136         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1137                 writel(bridge->driver->mask_memory(bridge,
1138                                                    page_to_phys(mem->pages[i]),
1139                                                    mask_type),
1140                        bridge->gatt_table+j);
1141         }
1142         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1143
1144         bridge->driver->tlb_flush(mem);
1145         return 0;
1146 }
1147 EXPORT_SYMBOL(agp_generic_insert_memory);
1148
1149
1150 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1151 {
1152         size_t i;
1153         struct agp_bridge_data *bridge;
1154         int mask_type;
1155
1156         bridge = mem->bridge;
1157         if (!bridge)
1158                 return -EINVAL;
1159
1160         if (mem->page_count == 0)
1161                 return 0;
1162
1163         if (type != mem->type)
1164                 return -EINVAL;
1165
1166         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1167         if (mask_type != 0) {
1168                 /* The generic routines know nothing of memory types */
1169                 return -EINVAL;
1170         }
1171
1172         /* AK: bogus, should encode addresses > 4GB */
1173         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1174                 writel(bridge->scratch_page, bridge->gatt_table+i);
1175         }
1176         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1177
1178         bridge->driver->tlb_flush(mem);
1179         return 0;
1180 }
1181 EXPORT_SYMBOL(agp_generic_remove_memory);
1182
1183 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1184 {
1185         return NULL;
1186 }
1187 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1188
1189 void agp_generic_free_by_type(struct agp_memory *curr)
1190 {
1191         agp_free_page_array(curr);
1192         agp_free_key(curr->key);
1193         kfree(curr);
1194 }
1195 EXPORT_SYMBOL(agp_generic_free_by_type);
1196
1197 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1198 {
1199         struct agp_memory *new;
1200         int i;
1201         int pages;
1202
1203         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1204         new = agp_create_user_memory(page_count);
1205         if (new == NULL)
1206                 return NULL;
1207
1208         for (i = 0; i < page_count; i++)
1209                 new->pages[i] = NULL;
1210         new->page_count = 0;
1211         new->type = type;
1212         new->num_scratch_pages = pages;
1213
1214         return new;
1215 }
1216 EXPORT_SYMBOL(agp_generic_alloc_user);
1217
1218 /*
1219  * Basic Page Allocation Routines -
1220  * These routines handle page allocation and by default they reserve the allocated
1221  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1222  * against a maximum value.
1223  */
1224
1225 int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1226 {
1227         struct page * page;
1228         int i, ret = -ENOMEM;
1229
1230         for (i = 0; i < num_pages; i++) {
1231                 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1232                 /* agp_free_memory() needs gart address */
1233                 if (page == NULL)
1234                         goto out;
1235
1236 #ifndef CONFIG_X86
1237                 map_page_into_agp(page);
1238 #endif
1239                 get_page(page);
1240                 atomic_inc(&agp_bridge->current_memory_agp);
1241
1242                 mem->pages[i] = page;
1243                 mem->page_count++;
1244         }
1245
1246 #ifdef CONFIG_X86
1247         set_pages_array_uc(mem->pages, num_pages);
1248 #endif
1249         ret = 0;
1250 out:
1251         return ret;
1252 }
1253 EXPORT_SYMBOL(agp_generic_alloc_pages);
1254
1255 struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1256 {
1257         struct page * page;
1258
1259         page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1260         if (page == NULL)
1261                 return NULL;
1262
1263         map_page_into_agp(page);
1264
1265         get_page(page);
1266         atomic_inc(&agp_bridge->current_memory_agp);
1267         return page;
1268 }
1269 EXPORT_SYMBOL(agp_generic_alloc_page);
1270
1271 void agp_generic_destroy_pages(struct agp_memory *mem)
1272 {
1273         int i;
1274         struct page *page;
1275
1276         if (!mem)
1277                 return;
1278
1279 #ifdef CONFIG_X86
1280         set_pages_array_wb(mem->pages, mem->page_count);
1281 #endif
1282
1283         for (i = 0; i < mem->page_count; i++) {
1284                 page = mem->pages[i];
1285
1286 #ifndef CONFIG_X86
1287                 unmap_page_from_agp(page);
1288 #endif
1289                 put_page(page);
1290                 __free_page(page);
1291                 atomic_dec(&agp_bridge->current_memory_agp);
1292                 mem->pages[i] = NULL;
1293         }
1294 }
1295 EXPORT_SYMBOL(agp_generic_destroy_pages);
1296
1297 void agp_generic_destroy_page(struct page *page, int flags)
1298 {
1299         if (page == NULL)
1300                 return;
1301
1302         if (flags & AGP_PAGE_DESTROY_UNMAP)
1303                 unmap_page_from_agp(page);
1304
1305         if (flags & AGP_PAGE_DESTROY_FREE) {
1306                 put_page(page);
1307                 __free_page(page);
1308                 atomic_dec(&agp_bridge->current_memory_agp);
1309         }
1310 }
1311 EXPORT_SYMBOL(agp_generic_destroy_page);
1312
1313 /* End Basic Page Allocation Routines */
1314
1315
1316 /**
1317  * agp_enable  -  initialise the agp point-to-point connection.
1318  *
1319  * @mode:       agp mode register value to configure with.
1320  */
1321 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1322 {
1323         if (!bridge)
1324                 return;
1325         bridge->driver->agp_enable(bridge, mode);
1326 }
1327 EXPORT_SYMBOL(agp_enable);
1328
1329 /* When we remove the global variable agp_bridge from all drivers
1330  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1331  */
1332
1333 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1334 {
1335         if (list_empty(&agp_bridges))
1336                 return NULL;
1337
1338         return agp_bridge;
1339 }
1340
1341 static void ipi_handler(void *null)
1342 {
1343         flush_agp_cache();
1344 }
1345
1346 void global_cache_flush(void)
1347 {
1348         if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1349                 panic(PFX "timed out waiting for the other CPUs!\n");
1350 }
1351 EXPORT_SYMBOL(global_cache_flush);
1352
1353 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1354                                       dma_addr_t addr, int type)
1355 {
1356         /* memory type is ignored in the generic routine */
1357         if (bridge->driver->masks)
1358                 return addr | bridge->driver->masks[0].mask;
1359         else
1360                 return addr;
1361 }
1362 EXPORT_SYMBOL(agp_generic_mask_memory);
1363
1364 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1365                                   int type)
1366 {
1367         if (type >= AGP_USER_TYPES)
1368                 return 0;
1369         return type;
1370 }
1371 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1372
1373 /*
1374  * These functions are implemented according to the AGPv3 spec,
1375  * which covers implementation details that had previously been
1376  * left open.
1377  */
1378
1379 int agp3_generic_fetch_size(void)
1380 {
1381         u16 temp_size;
1382         int i;
1383         struct aper_size_info_16 *values;
1384
1385         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1386         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1387
1388         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1389                 if (temp_size == values[i].size_value) {
1390                         agp_bridge->previous_size =
1391                                 agp_bridge->current_size = (void *) (values + i);
1392
1393                         agp_bridge->aperture_size_idx = i;
1394                         return values[i].size;
1395                 }
1396         }
1397         return 0;
1398 }
1399 EXPORT_SYMBOL(agp3_generic_fetch_size);
1400
1401 void agp3_generic_tlbflush(struct agp_memory *mem)
1402 {
1403         u32 ctrl;
1404         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1405         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1406         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1407 }
1408 EXPORT_SYMBOL(agp3_generic_tlbflush);
1409
1410 int agp3_generic_configure(void)
1411 {
1412         u32 temp;
1413         struct aper_size_info_16 *current_size;
1414
1415         current_size = A_SIZE_16(agp_bridge->current_size);
1416
1417         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1418         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1419
1420         /* set aperture size */
1421         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1422         /* set gart pointer */
1423         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1424         /* enable aperture and GTLB */
1425         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1426         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1427         return 0;
1428 }
1429 EXPORT_SYMBOL(agp3_generic_configure);
1430
1431 void agp3_generic_cleanup(void)
1432 {
1433         u32 ctrl;
1434         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1435         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1436 }
1437 EXPORT_SYMBOL(agp3_generic_cleanup);
1438
1439 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1440 {
1441         {4096, 1048576, 10,0x000},
1442         {2048,  524288, 9, 0x800},
1443         {1024,  262144, 8, 0xc00},
1444         { 512,  131072, 7, 0xe00},
1445         { 256,   65536, 6, 0xf00},
1446         { 128,   32768, 5, 0xf20},
1447         {  64,   16384, 4, 0xf30},
1448         {  32,    8192, 3, 0xf38},
1449         {  16,    4096, 2, 0xf3c},
1450         {   8,    2048, 1, 0xf3e},
1451         {   4,    1024, 0, 0xf3f}
1452 };
1453 EXPORT_SYMBOL(agp3_generic_sizes);
1454