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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  1 /*
  2  * AGPGART driver.
  3  * Copyright (C) 2004 Silicon Graphics, Inc.
  4  * Copyright (C) 2002-2005 Dave Jones.
  5  * Copyright (C) 1999 Jeff Hartmann.
  6  * Copyright (C) 1999 Precision Insight, Inc.
  7  * Copyright (C) 1999 Xi Graphics, Inc.
  8  *
  9  * Permission is hereby granted, free of charge, to any person obtaining a
 10  * copy of this software and associated documentation files (the "Software"),
 11  * to deal in the Software without restriction, including without limitation
 12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 13  * and/or sell copies of the Software, and to permit persons to whom the
 14  * Software is furnished to do so, subject to the following conditions:
 15  *
 16  * The above copyright notice and this permission notice shall be included
 17  * in all copies or substantial portions of the Software.
 18  *
 19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
 23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 26  *
 27  * TODO:
 28  * - Allocate more than order 0 pages to avoid too much linear map splitting.
 29  */
 30 #include <linux/module.h>
 31 #include <linux/pci.h>
 32 #include <linux/init.h>
 33 #include <linux/pagemap.h>
 34 #include <linux/miscdevice.h>
 35 #include <linux/pm.h>
 36 #include <linux/agp_backend.h>
 37 #include <linux/vmalloc.h>
 38 #include <linux/dma-mapping.h>
 39 #include <linux/mm.h>
 40 #include <linux/sched.h>
 41 #include <asm/io.h>
 42 #include <asm/cacheflush.h>
 43 #include <asm/pgtable.h>
 44 #include "agp.h"
 45 
 46 __u32 *agp_gatt_table;
 47 int agp_memory_reserved;
 48 
 49 /*
 50  * Needed by the Nforce GART driver for the time being. Would be
 51  * nice to do this some other way instead of needing this export.
 52  */
 53 EXPORT_SYMBOL_GPL(agp_memory_reserved);
 54 
 55 /*
 56  * Generic routines for handling agp_memory structures -
 57  * They use the basic page allocation routines to do the brunt of the work.
 58  */
 59 
 60 void agp_free_key(int key)
 61 {
 62         if (key < 0)
 63                 return;
 64 
 65         if (key < MAXKEY)
 66                 clear_bit(key, agp_bridge->key_list);
 67 }
 68 EXPORT_SYMBOL(agp_free_key);
 69 
 70 
 71 static int agp_get_key(void)
 72 {
 73         int bit;
 74 
 75         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
 76         if (bit < MAXKEY) {
 77                 set_bit(bit, agp_bridge->key_list);
 78                 return bit;
 79         }
 80         return -1;
 81 }
 82 
 83 void agp_flush_chipset(struct agp_bridge_data *bridge)
 84 {
 85         if (bridge->driver->chipset_flush)
 86                 bridge->driver->chipset_flush(bridge);
 87 }
 88 EXPORT_SYMBOL(agp_flush_chipset);
 89 
 90 /*
 91  * Use kmalloc if possible for the page list. Otherwise fall back to
 92  * vmalloc. This speeds things up and also saves memory for small AGP
 93  * regions.
 94  */
 95 
 96 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
 97 {
 98         mem->memory = NULL;
 99         mem->vmalloc_flag = 0;
100 
101         if (size <= 2*PAGE_SIZE)
102                 mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
103         if (mem->memory == NULL) {
104                 mem->memory = vmalloc(size);
105                 mem->vmalloc_flag = 1;
106         }
107 }
108 EXPORT_SYMBOL(agp_alloc_page_array);
109 
110 void agp_free_page_array(struct agp_memory *mem)
111 {
112         if (mem->vmalloc_flag) {
113                 vfree(mem->memory);
114         } else {
115                 kfree(mem->memory);
116         }
117 }
118 EXPORT_SYMBOL(agp_free_page_array);
119 
120 
121 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
122 {
123         struct agp_memory *new;
124         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
125 
126         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
127         if (new == NULL)
128                 return NULL;
129 
130         new->key = agp_get_key();
131 
132         if (new->key < 0) {
133                 kfree(new);
134                 return NULL;
135         }
136 
137         agp_alloc_page_array(alloc_size, new);
138 
139         if (new->memory == NULL) {
140                 agp_free_key(new->key);
141                 kfree(new);
142                 return NULL;
143         }
144         new->num_scratch_pages = 0;
145         return new;
146 }
147 
148 struct agp_memory *agp_create_memory(int scratch_pages)
149 {
150         struct agp_memory *new;
151 
152         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
153         if (new == NULL)
154                 return NULL;
155 
156         new->key = agp_get_key();
157 
158         if (new->key < 0) {
159                 kfree(new);
160                 return NULL;
161         }
162 
163         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
164 
165         if (new->memory == NULL) {
166                 agp_free_key(new->key);
167                 kfree(new);
168                 return NULL;
169         }
170         new->num_scratch_pages = scratch_pages;
171         new->type = AGP_NORMAL_MEMORY;
172         return new;
173 }
174 EXPORT_SYMBOL(agp_create_memory);
175 
176 /**
177  *      agp_free_memory - free memory associated with an agp_memory pointer.
178  *
179  *      @curr:          agp_memory pointer to be freed.
180  *
181  *      It is the only function that can be called when the backend is not owned
182  *      by the caller.  (So it can free memory on client death.)
183  */
184 void agp_free_memory(struct agp_memory *curr)
185 {
186         size_t i;
187 
188         if (curr == NULL)
189                 return;
190 
191         if (curr->is_bound == TRUE)
192                 agp_unbind_memory(curr);
193 
194         if (curr->type >= AGP_USER_TYPES) {
195                 agp_generic_free_by_type(curr);
196                 return;
197         }
198 
199         if (curr->type != 0) {
200                 curr->bridge->driver->free_by_type(curr);
201                 return;
202         }
203         if (curr->page_count != 0) {
204                 for (i = 0; i < curr->page_count; i++) {
205                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]), AGP_PAGE_DESTROY_UNMAP);
206                 }
207                 for (i = 0; i < curr->page_count; i++) {
208                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]), AGP_PAGE_DESTROY_FREE);
209                 }
210         }
211         agp_free_key(curr->key);
212         agp_free_page_array(curr);
213         kfree(curr);
214 }
215 EXPORT_SYMBOL(agp_free_memory);
216 
217 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
218 
219 /**
220  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
221  *
222  *      @page_count:    size_t argument of the number of pages
223  *      @type:  u32 argument of the type of memory to be allocated.
224  *
225  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
226  *      maps to physical ram.  Any other type is device dependent.
227  *
228  *      It returns NULL whenever memory is unavailable.
229  */
230 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
231                                         size_t page_count, u32 type)
232 {
233         int scratch_pages;
234         struct agp_memory *new;
235         size_t i;
236 
237         if (!bridge)
238                 return NULL;
239 
240         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
241                 return NULL;
242 
243         if (type >= AGP_USER_TYPES) {
244                 new = agp_generic_alloc_user(page_count, type);
245                 if (new)
246                         new->bridge = bridge;
247                 return new;
248         }
249 
250         if (type != 0) {
251                 new = bridge->driver->alloc_by_type(page_count, type);
252                 if (new)
253                         new->bridge = bridge;
254                 return new;
255         }
256 
257         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
258 
259         new = agp_create_memory(scratch_pages);
260 
261         if (new == NULL)
262                 return NULL;
263 
264         for (i = 0; i < page_count; i++) {
265                 void *addr = bridge->driver->agp_alloc_page(bridge);
266 
267                 if (addr == NULL) {
268                         agp_free_memory(new);
269                         return NULL;
270                 }
271                 new->memory[i] = virt_to_gart(addr);
272                 new->page_count++;
273         }
274         new->bridge = bridge;
275 
276         return new;
277 }
278 EXPORT_SYMBOL(agp_allocate_memory);
279 
280 
281 /* End - Generic routines for handling agp_memory structures */
282 
283 
284 static int agp_return_size(void)
285 {
286         int current_size;
287         void *temp;
288 
289         temp = agp_bridge->current_size;
290 
291         switch (agp_bridge->driver->size_type) {
292         case U8_APER_SIZE:
293                 current_size = A_SIZE_8(temp)->size;
294                 break;
295         case U16_APER_SIZE:
296                 current_size = A_SIZE_16(temp)->size;
297                 break;
298         case U32_APER_SIZE:
299                 current_size = A_SIZE_32(temp)->size;
300                 break;
301         case LVL2_APER_SIZE:
302                 current_size = A_SIZE_LVL2(temp)->size;
303                 break;
304         case FIXED_APER_SIZE:
305                 current_size = A_SIZE_FIX(temp)->size;
306                 break;
307         default:
308                 current_size = 0;
309                 break;
310         }
311 
312         current_size -= (agp_memory_reserved / (1024*1024));
313         if (current_size <0)
314                 current_size = 0;
315         return current_size;
316 }
317 
318 
319 int agp_num_entries(void)
320 {
321         int num_entries;
322         void *temp;
323 
324         temp = agp_bridge->current_size;
325 
326         switch (agp_bridge->driver->size_type) {
327         case U8_APER_SIZE:
328                 num_entries = A_SIZE_8(temp)->num_entries;
329                 break;
330         case U16_APER_SIZE:
331                 num_entries = A_SIZE_16(temp)->num_entries;
332                 break;
333         case U32_APER_SIZE:
334                 num_entries = A_SIZE_32(temp)->num_entries;
335                 break;
336         case LVL2_APER_SIZE:
337                 num_entries = A_SIZE_LVL2(temp)->num_entries;
338                 break;
339         case FIXED_APER_SIZE:
340                 num_entries = A_SIZE_FIX(temp)->num_entries;
341                 break;
342         default:
343                 num_entries = 0;
344                 break;
345         }
346 
347         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
348         if (num_entries<0)
349                 num_entries = 0;
350         return num_entries;
351 }
352 EXPORT_SYMBOL_GPL(agp_num_entries);
353 
354 
355 /**
356  *      agp_copy_info  -  copy bridge state information
357  *
358  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
359  *
360  *      This function copies information about the agp bridge device and the state of
361  *      the agp backend into an agp_kern_info pointer.
362  */
363 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
364 {
365         memset(info, 0, sizeof(struct agp_kern_info));
366         if (!bridge) {
367                 info->chipset = NOT_SUPPORTED;
368                 return -EIO;
369         }
370 
371         info->version.major = bridge->version->major;
372         info->version.minor = bridge->version->minor;
373         info->chipset = SUPPORTED;
374         info->device = bridge->dev;
375         if (bridge->mode & AGPSTAT_MODE_3_0)
376                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
377         else
378                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
379         info->aper_base = bridge->gart_bus_addr;
380         info->aper_size = agp_return_size();
381         info->max_memory = bridge->max_memory_agp;
382         info->current_memory = atomic_read(&bridge->current_memory_agp);
383         info->cant_use_aperture = bridge->driver->cant_use_aperture;
384         info->vm_ops = bridge->vm_ops;
385         info->page_mask = ~0UL;
386         return 0;
387 }
388 EXPORT_SYMBOL(agp_copy_info);
389 
390 /* End - Routine to copy over information structure */
391 
392 /*
393  * Routines for handling swapping of agp_memory into the GATT -
394  * These routines take agp_memory and insert them into the GATT.
395  * They call device specific routines to actually write to the GATT.
396  */
397 
398 /**
399  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
400  *
401  *      @curr:          agp_memory pointer
402  *      @pg_start:      an offset into the graphics aperture translation table
403  *
404  *      It returns -EINVAL if the pointer == NULL.
405  *      It returns -EBUSY if the area of the table requested is already in use.
406  */
407 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
408 {
409         int ret_val;
410 
411         if (curr == NULL)
412                 return -EINVAL;
413 
414         if (curr->is_bound == TRUE) {
415                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
416                 return -EINVAL;
417         }
418         if (curr->is_flushed == FALSE) {
419                 curr->bridge->driver->cache_flush();
420                 curr->is_flushed = TRUE;
421         }
422         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
423 
424         if (ret_val != 0)
425                 return ret_val;
426 
427         curr->is_bound = TRUE;
428         curr->pg_start = pg_start;
429         return 0;
430 }
431 EXPORT_SYMBOL(agp_bind_memory);
432 
433 
434 /**
435  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
436  *
437  * @curr:       agp_memory pointer to be removed from the GATT.
438  *
439  * It returns -EINVAL if this piece of agp_memory is not currently bound to
440  * the graphics aperture translation table or if the agp_memory pointer == NULL
441  */
442 int agp_unbind_memory(struct agp_memory *curr)
443 {
444         int ret_val;
445 
446         if (curr == NULL)
447                 return -EINVAL;
448 
449         if (curr->is_bound != TRUE) {
450                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
451                 return -EINVAL;
452         }
453 
454         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
455 
456         if (ret_val != 0)
457                 return ret_val;
458 
459         curr->is_bound = FALSE;
460         curr->pg_start = 0;
461         return 0;
462 }
463 EXPORT_SYMBOL(agp_unbind_memory);
464 
465 /* End - Routines for handling swapping of agp_memory into the GATT */
466 
467 
468 /* Generic Agp routines - Start */
469 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
470 {
471         u32 tmp;
472 
473         if (*requested_mode & AGP2_RESERVED_MASK) {
474                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
475                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
476                 *requested_mode &= ~AGP2_RESERVED_MASK;
477         }
478 
479         /*
480          * Some dumb bridges are programmed to disobey the AGP2 spec.
481          * This is likely a BIOS misprogramming rather than poweron default, or
482          * it would be a lot more common.
483          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
484          * AGPv2 spec 6.1.9 states:
485          *   The RATE field indicates the data transfer rates supported by this
486          *   device. A.G.P. devices must report all that apply.
487          * Fix them up as best we can.
488          */
489         switch (*bridge_agpstat & 7) {
490         case 4:
491                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
492                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
493                         "Fixing up support for x2 & x1\n");
494                 break;
495         case 2:
496                 *bridge_agpstat |= AGPSTAT2_1X;
497                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
498                         "Fixing up support for x1\n");
499                 break;
500         default:
501                 break;
502         }
503 
504         /* Check the speed bits make sense. Only one should be set. */
505         tmp = *requested_mode & 7;
506         switch (tmp) {
507                 case 0:
508                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
509                         *requested_mode |= AGPSTAT2_1X;
510                         break;
511                 case 1:
512                 case 2:
513                         break;
514                 case 3:
515                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
516                         break;
517                 case 4:
518                         break;
519                 case 5:
520                 case 6:
521                 case 7:
522                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
523                         break;
524         }
525 
526         /* disable SBA if it's not supported */
527         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
528                 *bridge_agpstat &= ~AGPSTAT_SBA;
529 
530         /* Set rate */
531         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
532                 *bridge_agpstat &= ~AGPSTAT2_4X;
533 
534         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
535                 *bridge_agpstat &= ~AGPSTAT2_2X;
536 
537         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
538                 *bridge_agpstat &= ~AGPSTAT2_1X;
539 
540         /* Now we know what mode it should be, clear out the unwanted bits. */
541         if (*bridge_agpstat & AGPSTAT2_4X)
542                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
543 
544         if (*bridge_agpstat & AGPSTAT2_2X)
545                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
546 
547         if (*bridge_agpstat & AGPSTAT2_1X)
548                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
549 
550         /* Apply any errata. */
551         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
552                 *bridge_agpstat &= ~AGPSTAT_FW;
553 
554         if (agp_bridge->flags & AGP_ERRATA_SBA)
555                 *bridge_agpstat &= ~AGPSTAT_SBA;
556 
557         if (agp_bridge->flags & AGP_ERRATA_1X) {
558                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
559                 *bridge_agpstat |= AGPSTAT2_1X;
560         }
561 
562         /* If we've dropped down to 1X, disable fast writes. */
563         if (*bridge_agpstat & AGPSTAT2_1X)
564                 *bridge_agpstat &= ~AGPSTAT_FW;
565 }
566 
567 /*
568  * requested_mode = Mode requested by (typically) X.
569  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
570  * vga_agpstat = PCI_AGP_STATUS from graphic card.
571  */
572 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
573 {
574         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
575         u32 tmp;
576 
577         if (*requested_mode & AGP3_RESERVED_MASK) {
578                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
579                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
580                 *requested_mode &= ~AGP3_RESERVED_MASK;
581         }
582 
583         /* Check the speed bits make sense. */
584         tmp = *requested_mode & 7;
585         if (tmp == 0) {
586                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
587                 *requested_mode |= AGPSTAT3_4X;
588         }
589         if (tmp >= 3) {
590                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
591                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
592         }
593 
594         /* ARQSZ - Set the value to the maximum one.
595          * Don't allow the mode register to override values. */
596         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
597                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
598 
599         /* Calibration cycle.
600          * Don't allow the mode register to override values. */
601         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
602                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
603 
604         /* SBA *must* be supported for AGP v3 */
605         *bridge_agpstat |= AGPSTAT_SBA;
606 
607         /*
608          * Set speed.
609          * Check for invalid speeds. This can happen when applications
610          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
611          */
612         if (*requested_mode & AGPSTAT_MODE_3_0) {
613                 /*
614                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
615                  * have been passed a 3.0 mode, but with 2.x speed bits set.
616                  * AGP2.x 4x -> AGP3.0 4x.
617                  */
618                 if (*requested_mode & AGPSTAT2_4X) {
619                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
620                                                 current->comm, *requested_mode);
621                         *requested_mode &= ~AGPSTAT2_4X;
622                         *requested_mode |= AGPSTAT3_4X;
623                 }
624         } else {
625                 /*
626                  * The caller doesn't know what they are doing. We are in 3.0 mode,
627                  * but have been passed an AGP 2.x mode.
628                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
629                  */
630                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
631                                         current->comm, *requested_mode);
632                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
633                 *requested_mode |= AGPSTAT3_4X;
634         }
635 
636         if (*requested_mode & AGPSTAT3_8X) {
637                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
638                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
639                         *bridge_agpstat |= AGPSTAT3_4X;
640                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
641                         return;
642                 }
643                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
644                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
645                         *bridge_agpstat |= AGPSTAT3_4X;
646                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
647                         return;
648                 }
649                 /* All set, bridge & device can do AGP x8*/
650                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
651                 goto done;
652 
653         } else if (*requested_mode & AGPSTAT3_4X) {
654                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
655                 *bridge_agpstat |= AGPSTAT3_4X;
656                 goto done;
657 
658         } else {
659 
660                 /*
661                  * If we didn't specify an AGP mode, we see if both
662                  * the graphics card, and the bridge can do x8, and use if so.
663                  * If not, we fall back to x4 mode.
664                  */
665                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
666                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
667                                 "supported by bridge & card (x8).\n");
668                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
669                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
670                 } else {
671                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
672                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
673                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
674                                         *bridge_agpstat, origbridge);
675                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
676                                 *bridge_agpstat |= AGPSTAT3_4X;
677                         }
678                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
679                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
680                                         *vga_agpstat, origvga);
681                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
682                                 *vga_agpstat |= AGPSTAT3_4X;
683                         }
684                 }
685         }
686 
687 done:
688         /* Apply any errata. */
689         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
690                 *bridge_agpstat &= ~AGPSTAT_FW;
691 
692         if (agp_bridge->flags & AGP_ERRATA_SBA)
693                 *bridge_agpstat &= ~AGPSTAT_SBA;
694 
695         if (agp_bridge->flags & AGP_ERRATA_1X) {
696                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
697                 *bridge_agpstat |= AGPSTAT2_1X;
698         }
699 }
700 
701 
702 /**
703  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
704  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
705  * @requested_mode: requested agp_stat from userspace (Typically from X)
706  * @bridge_agpstat: current agp_stat from AGP bridge.
707  *
708  * This function will hunt for an AGP graphics card, and try to match
709  * the requested mode to the capabilities of both the bridge and the card.
710  */
711 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
712 {
713         struct pci_dev *device = NULL;
714         u32 vga_agpstat;
715         u8 cap_ptr;
716 
717         for (;;) {
718                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
719                 if (!device) {
720                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
721                         return 0;
722                 }
723                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
724                 if (cap_ptr)
725                         break;
726         }
727 
728         /*
729          * Ok, here we have a AGP device. Disable impossible
730          * settings, and adjust the readqueue to the minimum.
731          */
732         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
733 
734         /* adjust RQ depth */
735         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
736              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
737                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
738 
739         /* disable FW if it's not supported */
740         if (!((bridge_agpstat & AGPSTAT_FW) &&
741                  (vga_agpstat & AGPSTAT_FW) &&
742                  (requested_mode & AGPSTAT_FW)))
743                 bridge_agpstat &= ~AGPSTAT_FW;
744 
745         /* Check to see if we are operating in 3.0 mode */
746         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
747                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
748         else
749                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
750 
751         pci_dev_put(device);
752         return bridge_agpstat;
753 }
754 EXPORT_SYMBOL(agp_collect_device_status);
755 
756 
757 void agp_device_command(u32 bridge_agpstat, int agp_v3)
758 {
759         struct pci_dev *device = NULL;
760         int mode;
761 
762         mode = bridge_agpstat & 0x7;
763         if (agp_v3)
764                 mode *= 4;
765 
766         for_each_pci_dev(device) {
767                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
768                 if (!agp)
769                         continue;
770 
771                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
772                                 agp_v3 ? 3 : 2, pci_name(device), mode);
773                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
774         }
775 }
776 EXPORT_SYMBOL(agp_device_command);
777 
778 
779 void get_agp_version(struct agp_bridge_data *bridge)
780 {
781         u32 ncapid;
782 
783         /* Exit early if already set by errata workarounds. */
784         if (bridge->major_version != 0)
785                 return;
786 
787         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
788         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
789         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
790 }
791 EXPORT_SYMBOL(get_agp_version);
792 
793 
794 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
795 {
796         u32 bridge_agpstat, temp;
797 
798         get_agp_version(agp_bridge);
799 
800         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
801                                 agp_bridge->major_version,
802                                 agp_bridge->minor_version,
803                                 pci_name(agp_bridge->dev));
804 
805         pci_read_config_dword(agp_bridge->dev,
806                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
807 
808         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
809         if (bridge_agpstat == 0)
810                 /* Something bad happened. FIXME: Return error code? */
811                 return;
812 
813         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
814 
815         /* Do AGP version specific frobbing. */
816         if (bridge->major_version >= 3) {
817                 if (bridge->mode & AGPSTAT_MODE_3_0) {
818                         /* If we have 3.5, we can do the isoch stuff. */
819                         if (bridge->minor_version >= 5)
820                                 agp_3_5_enable(bridge);
821                         agp_device_command(bridge_agpstat, TRUE);
822                         return;
823                 } else {
824                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
825                     bridge_agpstat &= ~(7<<10) ;
826                     pci_read_config_dword(bridge->dev,
827                                         bridge->capndx+AGPCTRL, &temp);
828                     temp |= (1<<9);
829                     pci_write_config_dword(bridge->dev,
830                                         bridge->capndx+AGPCTRL, temp);
831 
832                     printk(KERN_INFO PFX "Device is in legacy mode,"
833                                 " falling back to 2.x\n");
834                 }
835         }
836 
837         /* AGP v<3 */
838         agp_device_command(bridge_agpstat, FALSE);
839 }
840 EXPORT_SYMBOL(agp_generic_enable);
841 
842 
843 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
844 {
845         char *table;
846         char *table_end;
847         int size;
848         int page_order;
849         int num_entries;
850         int i;
851         void *temp;
852         struct page *page;
853 
854         /* The generic routines can't handle 2 level gatt's */
855         if (bridge->driver->size_type == LVL2_APER_SIZE)
856                 return -EINVAL;
857 
858         table = NULL;
859         i = bridge->aperture_size_idx;
860         temp = bridge->current_size;
861         size = page_order = num_entries = 0;
862 
863         if (bridge->driver->size_type != FIXED_APER_SIZE) {
864                 do {
865                         switch (bridge->driver->size_type) {
866                         case U8_APER_SIZE:
867                                 size = A_SIZE_8(temp)->size;
868                                 page_order =
869                                     A_SIZE_8(temp)->page_order;
870                                 num_entries =
871                                     A_SIZE_8(temp)->num_entries;
872                                 break;
873                         case U16_APER_SIZE:
874                                 size = A_SIZE_16(temp)->size;
875                                 page_order = A_SIZE_16(temp)->page_order;
876                                 num_entries = A_SIZE_16(temp)->num_entries;
877                                 break;
878                         case U32_APER_SIZE:
879                                 size = A_SIZE_32(temp)->size;
880                                 page_order = A_SIZE_32(temp)->page_order;
881                                 num_entries = A_SIZE_32(temp)->num_entries;
882                                 break;
883                                 /* This case will never really happen. */
884                         case FIXED_APER_SIZE:
885                         case LVL2_APER_SIZE:
886                         default:
887                                 size = page_order = num_entries = 0;
888                                 break;
889                         }
890 
891                         table = alloc_gatt_pages(page_order);
892 
893                         if (table == NULL) {
894                                 i++;
895                                 switch (bridge->driver->size_type) {
896                                 case U8_APER_SIZE:
897                                         bridge->current_size = A_IDX8(bridge);
898                                         break;
899                                 case U16_APER_SIZE:
900                                         bridge->current_size = A_IDX16(bridge);
901                                         break;
902                                 case U32_APER_SIZE:
903                                         bridge->current_size = A_IDX32(bridge);
904                                         break;
905                                 /* These cases will never really happen. */
906                                 case FIXED_APER_SIZE:
907                                 case LVL2_APER_SIZE:
908                                 default:
909                                         break;
910                                 }
911                                 temp = bridge->current_size;
912                         } else {
913                                 bridge->aperture_size_idx = i;
914                         }
915                 } while (!table && (i < bridge->driver->num_aperture_sizes));
916         } else {
917                 size = ((struct aper_size_info_fixed *) temp)->size;
918                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
919                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
920                 table = alloc_gatt_pages(page_order);
921         }
922 
923         if (table == NULL)
924                 return -ENOMEM;
925 
926         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
927 
928         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
929                 SetPageReserved(page);
930 
931         bridge->gatt_table_real = (u32 *) table;
932         agp_gatt_table = (void *)table;
933 
934         bridge->driver->cache_flush();
935 #ifdef CONFIG_X86
936         set_memory_uc((unsigned long)table, 1 << page_order);
937         bridge->gatt_table = (void *)table;
938 #else
939         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
940                                         (PAGE_SIZE * (1 << page_order)));
941         bridge->driver->cache_flush();
942 #endif
943 
944         if (bridge->gatt_table == NULL) {
945                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
946                         ClearPageReserved(page);
947 
948                 free_gatt_pages(table, page_order);
949 
950                 return -ENOMEM;
951         }
952         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
953 
954         /* AK: bogus, should encode addresses > 4GB */
955         for (i = 0; i < num_entries; i++) {
956                 writel(bridge->scratch_page, bridge->gatt_table+i);
957                 readl(bridge->gatt_table+i);    /* PCI Posting. */
958         }
959 
960         return 0;
961 }
962 EXPORT_SYMBOL(agp_generic_create_gatt_table);
963 
964 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
965 {
966         int page_order;
967         char *table, *table_end;
968         void *temp;
969         struct page *page;
970 
971         temp = bridge->current_size;
972 
973         switch (bridge->driver->size_type) {
974         case U8_APER_SIZE:
975                 page_order = A_SIZE_8(temp)->page_order;
976                 break;
977         case U16_APER_SIZE:
978                 page_order = A_SIZE_16(temp)->page_order;
979                 break;
980         case U32_APER_SIZE:
981                 page_order = A_SIZE_32(temp)->page_order;
982                 break;
983         case FIXED_APER_SIZE:
984                 page_order = A_SIZE_FIX(temp)->page_order;
985                 break;
986         case LVL2_APER_SIZE:
987                 /* The generic routines can't deal with 2 level gatt's */
988                 return -EINVAL;
989                 break;
990         default:
991                 page_order = 0;
992                 break;
993         }
994 
995         /* Do not worry about freeing memory, because if this is
996          * called, then all agp memory is deallocated and removed
997          * from the table. */
998 
999 #ifdef CONFIG_X86
1000         set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1001 #else
1002         iounmap(bridge->gatt_table);
1003 #endif
1004         table = (char *) bridge->gatt_table_real;
1005         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1006 
1007         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1008                 ClearPageReserved(page);
1009 
1010         free_gatt_pages(bridge->gatt_table_real, page_order);
1011 
1012         agp_gatt_table = NULL;
1013         bridge->gatt_table = NULL;
1014         bridge->gatt_table_real = NULL;
1015         bridge->gatt_bus_addr = 0;
1016 
1017         return 0;
1018 }
1019 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1020 
1021 
1022 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1023 {
1024         int num_entries;
1025         size_t i;
1026         off_t j;
1027         void *temp;
1028         struct agp_bridge_data *bridge;
1029         int mask_type;
1030 
1031         bridge = mem->bridge;
1032         if (!bridge)
1033                 return -EINVAL;
1034 
1035         if (mem->page_count == 0)
1036                 return 0;
1037 
1038         temp = bridge->current_size;
1039 
1040         switch (bridge->driver->size_type) {
1041         case U8_APER_SIZE:
1042                 num_entries = A_SIZE_8(temp)->num_entries;
1043                 break;
1044         case U16_APER_SIZE:
1045                 num_entries = A_SIZE_16(temp)->num_entries;
1046                 break;
1047         case U32_APER_SIZE:
1048                 num_entries = A_SIZE_32(temp)->num_entries;
1049                 break;
1050         case FIXED_APER_SIZE:
1051                 num_entries = A_SIZE_FIX(temp)->num_entries;
1052                 break;
1053         case LVL2_APER_SIZE:
1054                 /* The generic routines can't deal with 2 level gatt's */
1055                 return -EINVAL;
1056                 break;
1057         default:
1058                 num_entries = 0;
1059                 break;
1060         }
1061 
1062         num_entries -= agp_memory_reserved/PAGE_SIZE;
1063         if (num_entries < 0) num_entries = 0;
1064 
1065         if (type != mem->type)
1066                 return -EINVAL;
1067 
1068         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1069         if (mask_type != 0) {
1070                 /* The generic routines know nothing of memory types */
1071                 return -EINVAL;
1072         }
1073 
1074         /* AK: could wrap */
1075         if ((pg_start + mem->page_count) > num_entries)
1076                 return -EINVAL;
1077 
1078         j = pg_start;
1079 
1080         while (j < (pg_start + mem->page_count)) {
1081                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1082                         return -EBUSY;
1083                 j++;
1084         }
1085 
1086         if (mem->is_flushed == FALSE) {
1087                 bridge->driver->cache_flush();
1088                 mem->is_flushed = TRUE;
1089         }
1090 
1091         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1092                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mask_type),
1093                        bridge->gatt_table+j);
1094         }
1095         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1096 
1097         bridge->driver->tlb_flush(mem);
1098         return 0;
1099 }
1100 EXPORT_SYMBOL(agp_generic_insert_memory);
1101 
1102 
1103 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1104 {
1105         size_t i;
1106         struct agp_bridge_data *bridge;
1107         int mask_type;
1108 
1109         bridge = mem->bridge;
1110         if (!bridge)
1111                 return -EINVAL;
1112 
1113         if (mem->page_count == 0)
1114                 return 0;
1115 
1116         if (type != mem->type)
1117                 return -EINVAL;
1118 
1119         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1120         if (mask_type != 0) {
1121                 /* The generic routines know nothing of memory types */
1122                 return -EINVAL;
1123         }
1124 
1125         /* AK: bogus, should encode addresses > 4GB */
1126         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1127                 writel(bridge->scratch_page, bridge->gatt_table+i);
1128         }
1129         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1130 
1131         bridge->driver->tlb_flush(mem);
1132         return 0;
1133 }
1134 EXPORT_SYMBOL(agp_generic_remove_memory);
1135 
1136 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1137 {
1138         return NULL;
1139 }
1140 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1141 
1142 void agp_generic_free_by_type(struct agp_memory *curr)
1143 {
1144         agp_free_page_array(curr);
1145         agp_free_key(curr->key);
1146         kfree(curr);
1147 }
1148 EXPORT_SYMBOL(agp_generic_free_by_type);
1149 
1150 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1151 {
1152         struct agp_memory *new;
1153         int i;
1154         int pages;
1155 
1156         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1157         new = agp_create_user_memory(page_count);
1158         if (new == NULL)
1159                 return NULL;
1160 
1161         for (i = 0; i < page_count; i++)
1162                 new->memory[i] = 0;
1163         new->page_count = 0;
1164         new->type = type;
1165         new->num_scratch_pages = pages;
1166 
1167         return new;
1168 }
1169 EXPORT_SYMBOL(agp_generic_alloc_user);
1170 
1171 /*
1172  * Basic Page Allocation Routines -
1173  * These routines handle page allocation and by default they reserve the allocated
1174  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1175  * against a maximum value.
1176  */
1177 
1178 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1179 {
1180         struct page * page;
1181 
1182         page = alloc_page(GFP_KERNEL | GFP_DMA32);
1183         if (page == NULL)
1184                 return NULL;
1185 
1186         map_page_into_agp(page);
1187 
1188         get_page(page);
1189         atomic_inc(&agp_bridge->current_memory_agp);
1190         return page_address(page);
1191 }
1192 EXPORT_SYMBOL(agp_generic_alloc_page);
1193 
1194 
1195 void agp_generic_destroy_page(void *addr, int flags)
1196 {
1197         struct page *page;
1198 
1199         if (addr == NULL)
1200                 return;
1201 
1202         page = virt_to_page(addr);
1203         if (flags & AGP_PAGE_DESTROY_UNMAP)
1204                 unmap_page_from_agp(page);
1205 
1206         if (flags & AGP_PAGE_DESTROY_FREE) {
1207                 put_page(page);
1208                 free_page((unsigned long)addr);
1209                 atomic_dec(&agp_bridge->current_memory_agp);
1210         }
1211 }
1212 EXPORT_SYMBOL(agp_generic_destroy_page);
1213 
1214 /* End Basic Page Allocation Routines */
1215 
1216 
1217 /**
1218  * agp_enable  -  initialise the agp point-to-point connection.
1219  *
1220  * @mode:       agp mode register value to configure with.
1221  */
1222 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1223 {
1224         if (!bridge)
1225                 return;
1226         bridge->driver->agp_enable(bridge, mode);
1227 }
1228 EXPORT_SYMBOL(agp_enable);
1229 
1230 /* When we remove the global variable agp_bridge from all drivers
1231  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1232  */
1233 
1234 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1235 {
1236         if (list_empty(&agp_bridges))
1237                 return NULL;
1238 
1239         return agp_bridge;
1240 }
1241 
1242 static void ipi_handler(void *null)
1243 {
1244         flush_agp_cache();
1245 }
1246 
1247 void global_cache_flush(void)
1248 {
1249         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1250                 panic(PFX "timed out waiting for the other CPUs!\n");
1251 }
1252 EXPORT_SYMBOL(global_cache_flush);
1253 
1254 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1255         unsigned long addr, int type)
1256 {
1257         /* memory type is ignored in the generic routine */
1258         if (bridge->driver->masks)
1259                 return addr | bridge->driver->masks[0].mask;
1260         else
1261                 return addr;
1262 }
1263 EXPORT_SYMBOL(agp_generic_mask_memory);
1264 
1265 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1266                                   int type)
1267 {
1268         if (type >= AGP_USER_TYPES)
1269                 return 0;
1270         return type;
1271 }
1272 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1273 
1274 /*
1275  * These functions are implemented according to the AGPv3 spec,
1276  * which covers implementation details that had previously been
1277  * left open.
1278  */
1279 
1280 int agp3_generic_fetch_size(void)
1281 {
1282         u16 temp_size;
1283         int i;
1284         struct aper_size_info_16 *values;
1285 
1286         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1287         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1288 
1289         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1290                 if (temp_size == values[i].size_value) {
1291                         agp_bridge->previous_size =
1292                                 agp_bridge->current_size = (void *) (values + i);
1293 
1294                         agp_bridge->aperture_size_idx = i;
1295                         return values[i].size;
1296                 }
1297         }
1298         return 0;
1299 }
1300 EXPORT_SYMBOL(agp3_generic_fetch_size);
1301 
1302 void agp3_generic_tlbflush(struct agp_memory *mem)
1303 {
1304         u32 ctrl;
1305         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1306         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1307         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1308 }
1309 EXPORT_SYMBOL(agp3_generic_tlbflush);
1310 
1311 int agp3_generic_configure(void)
1312 {
1313         u32 temp;
1314         struct aper_size_info_16 *current_size;
1315 
1316         current_size = A_SIZE_16(agp_bridge->current_size);
1317 
1318         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1319         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1320 
1321         /* set aperture size */
1322         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1323         /* set gart pointer */
1324         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1325         /* enable aperture and GTLB */
1326         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1327         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1328         return 0;
1329 }
1330 EXPORT_SYMBOL(agp3_generic_configure);
1331 
1332 void agp3_generic_cleanup(void)
1333 {
1334         u32 ctrl;
1335         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1336         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1337 }
1338 EXPORT_SYMBOL(agp3_generic_cleanup);
1339 
1340 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1341 {
1342         {4096, 1048576, 10,0x000},
1343         {2048,  524288, 9, 0x800},
1344         {1024,  262144, 8, 0xc00},
1345         { 512,  131072, 7, 0xe00},
1346         { 256,   65536, 6, 0xf00},
1347         { 128,   32768, 5, 0xf20},
1348         {  64,   16384, 4, 0xf30},
1349         {  32,    8192, 3, 0xf38},
1350         {  16,    4096, 2, 0xf3c},
1351         {   8,    2048, 1, 0xf3e},
1352         {   4,    1024, 0, 0xf3f}
1353 };
1354 EXPORT_SYMBOL(agp3_generic_sizes);
1355 
1356 
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