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