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.
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:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
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.
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
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>
36 #include <linux/agp_backend.h>
37 #include <linux/vmalloc.h>
38 #include <linux/dma-mapping.h>
41 #include <asm/cacheflush.h>
42 #include <asm/pgtable.h>
45 __u32
*agp_gatt_table
;
46 int agp_memory_reserved
;
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.
52 EXPORT_SYMBOL_GPL(agp_memory_reserved
);
54 #if defined(CONFIG_X86)
55 int map_page_into_agp(struct page
*page
)
58 i
= change_page_attr(page
, 1, PAGE_KERNEL_NOCACHE
);
59 /* Caller's responsibility to call global_flush_tlb() for
60 * performance reasons */
63 EXPORT_SYMBOL_GPL(map_page_into_agp
);
65 int unmap_page_from_agp(struct page
*page
)
68 i
= change_page_attr(page
, 1, PAGE_KERNEL
);
69 /* Caller's responsibility to call global_flush_tlb() for
70 * performance reasons */
73 EXPORT_SYMBOL_GPL(unmap_page_from_agp
);
77 * Generic routines for handling agp_memory structures -
78 * They use the basic page allocation routines to do the brunt of the work.
81 void agp_free_key(int key
)
87 clear_bit(key
, agp_bridge
->key_list
);
89 EXPORT_SYMBOL(agp_free_key
);
92 static int agp_get_key(void)
96 bit
= find_first_zero_bit(agp_bridge
->key_list
, MAXKEY
);
98 set_bit(bit
, agp_bridge
->key_list
);
105 struct agp_memory
*agp_create_memory(int scratch_pages
)
107 struct agp_memory
*new;
109 new = kzalloc(sizeof(struct agp_memory
), GFP_KERNEL
);
113 new->key
= agp_get_key();
119 new->memory
= vmalloc(PAGE_SIZE
* scratch_pages
);
121 if (new->memory
== NULL
) {
122 agp_free_key(new->key
);
126 new->num_scratch_pages
= scratch_pages
;
129 EXPORT_SYMBOL(agp_create_memory
);
132 * agp_free_memory - free memory associated with an agp_memory pointer.
134 * @curr: agp_memory pointer to be freed.
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.)
139 void agp_free_memory(struct agp_memory
*curr
)
146 if (curr
->is_bound
== TRUE
)
147 agp_unbind_memory(curr
);
149 if (curr
->type
!= 0) {
150 curr
->bridge
->driver
->free_by_type(curr
);
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
]));
157 flush_agp_mappings();
159 agp_free_key(curr
->key
);
163 EXPORT_SYMBOL(agp_free_memory
);
165 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
168 * agp_allocate_memory - allocate a group of pages of a certain type.
170 * @page_count: size_t argument of the number of pages
171 * @type: u32 argument of the type of memory to be allocated.
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.
176 * It returns NULL whenever memory is unavailable.
178 struct agp_memory
*agp_allocate_memory(struct agp_bridge_data
*bridge
,
179 size_t page_count
, u32 type
)
182 struct agp_memory
*new;
188 if ((atomic_read(&bridge
->current_memory_agp
) + page_count
) > bridge
->max_memory_agp
)
192 new = bridge
->driver
->alloc_by_type(page_count
, type
);
194 new->bridge
= bridge
;
198 scratch_pages
= (page_count
+ ENTRIES_PER_PAGE
- 1) / ENTRIES_PER_PAGE
;
200 new = agp_create_memory(scratch_pages
);
205 for (i
= 0; i
< page_count
; i
++) {
206 void *addr
= bridge
->driver
->agp_alloc_page(bridge
);
209 agp_free_memory(new);
212 new->memory
[i
] = virt_to_gart(addr
);
215 new->bridge
= bridge
;
217 flush_agp_mappings();
221 EXPORT_SYMBOL(agp_allocate_memory
);
224 /* End - Generic routines for handling agp_memory structures */
227 static int agp_return_size(void)
232 temp
= agp_bridge
->current_size
;
234 switch (agp_bridge
->driver
->size_type
) {
236 current_size
= A_SIZE_8(temp
)->size
;
239 current_size
= A_SIZE_16(temp
)->size
;
242 current_size
= A_SIZE_32(temp
)->size
;
245 current_size
= A_SIZE_LVL2(temp
)->size
;
247 case FIXED_APER_SIZE
:
248 current_size
= A_SIZE_FIX(temp
)->size
;
255 current_size
-= (agp_memory_reserved
/ (1024*1024));
262 int agp_num_entries(void)
267 temp
= agp_bridge
->current_size
;
269 switch (agp_bridge
->driver
->size_type
) {
271 num_entries
= A_SIZE_8(temp
)->num_entries
;
274 num_entries
= A_SIZE_16(temp
)->num_entries
;
277 num_entries
= A_SIZE_32(temp
)->num_entries
;
280 num_entries
= A_SIZE_LVL2(temp
)->num_entries
;
282 case FIXED_APER_SIZE
:
283 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
290 num_entries
-= agp_memory_reserved
>>PAGE_SHIFT
;
295 EXPORT_SYMBOL_GPL(agp_num_entries
);
299 * agp_copy_info - copy bridge state information
301 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
303 * This function copies information about the agp bridge device and the state of
304 * the agp backend into an agp_kern_info pointer.
306 int agp_copy_info(struct agp_bridge_data
*bridge
, struct agp_kern_info
*info
)
308 memset(info
, 0, sizeof(struct agp_kern_info
));
310 info
->chipset
= NOT_SUPPORTED
;
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
;
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;
331 EXPORT_SYMBOL(agp_copy_info
);
333 /* End - Routine to copy over information structure */
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.
342 * agp_bind_memory - Bind an agp_memory structure into the GATT.
344 * @curr: agp_memory pointer
345 * @pg_start: an offset into the graphics aperture translation table
347 * It returns -EINVAL if the pointer == NULL.
348 * It returns -EBUSY if the area of the table requested is already in use.
350 int agp_bind_memory(struct agp_memory
*curr
, off_t pg_start
)
357 if (curr
->is_bound
== TRUE
) {
358 printk(KERN_INFO PFX
"memory %p is already bound!\n", curr
);
361 if (curr
->is_flushed
== FALSE
) {
362 curr
->bridge
->driver
->cache_flush();
363 curr
->is_flushed
= TRUE
;
365 ret_val
= curr
->bridge
->driver
->insert_memory(curr
, pg_start
, curr
->type
);
370 curr
->is_bound
= TRUE
;
371 curr
->pg_start
= pg_start
;
374 EXPORT_SYMBOL(agp_bind_memory
);
378 * agp_unbind_memory - Removes an agp_memory structure from the GATT
380 * @curr: agp_memory pointer to be removed from the GATT.
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
385 int agp_unbind_memory(struct agp_memory
*curr
)
392 if (curr
->is_bound
!= TRUE
) {
393 printk(KERN_INFO PFX
"memory %p was not bound!\n", curr
);
397 ret_val
= curr
->bridge
->driver
->remove_memory(curr
, curr
->pg_start
, curr
->type
);
402 curr
->is_bound
= FALSE
;
406 EXPORT_SYMBOL(agp_unbind_memory
);
408 /* End - Routines for handling swapping of agp_memory into the GATT */
411 /* Generic Agp routines - Start */
412 static void agp_v2_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
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
;
422 /* Check the speed bits make sense. Only one should be set. */
423 tmp
= *requested_mode
& 7;
426 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to x1 mode.\n", current
->comm
);
427 *requested_mode
|= AGPSTAT2_1X
;
433 *requested_mode
&= ~(AGPSTAT2_1X
); /* rate=2 */
440 *requested_mode
&= ~(AGPSTAT2_1X
|AGPSTAT2_2X
); /* rate=4*/
444 /* disable SBA if it's not supported */
445 if (!((*bridge_agpstat
& AGPSTAT_SBA
) && (*vga_agpstat
& AGPSTAT_SBA
) && (*requested_mode
& AGPSTAT_SBA
)))
446 *bridge_agpstat
&= ~AGPSTAT_SBA
;
449 if (!((*bridge_agpstat
& AGPSTAT2_4X
) && (*vga_agpstat
& AGPSTAT2_4X
) && (*requested_mode
& AGPSTAT2_4X
)))
450 *bridge_agpstat
&= ~AGPSTAT2_4X
;
452 if (!((*bridge_agpstat
& AGPSTAT2_2X
) && (*vga_agpstat
& AGPSTAT2_2X
) && (*requested_mode
& AGPSTAT2_2X
)))
453 *bridge_agpstat
&= ~AGPSTAT2_2X
;
455 if (!((*bridge_agpstat
& AGPSTAT2_1X
) && (*vga_agpstat
& AGPSTAT2_1X
) && (*requested_mode
& AGPSTAT2_1X
)))
456 *bridge_agpstat
&= ~AGPSTAT2_1X
;
458 /* Now we know what mode it should be, clear out the unwanted bits. */
459 if (*bridge_agpstat
& AGPSTAT2_4X
)
460 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_2X
); /* 4X */
462 if (*bridge_agpstat
& AGPSTAT2_2X
)
463 *bridge_agpstat
&= ~(AGPSTAT2_1X
| AGPSTAT2_4X
); /* 2X */
465 if (*bridge_agpstat
& AGPSTAT2_1X
)
466 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
); /* 1X */
468 /* Apply any errata. */
469 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
470 *bridge_agpstat
&= ~AGPSTAT_FW
;
472 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
473 *bridge_agpstat
&= ~AGPSTAT_SBA
;
475 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
476 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
477 *bridge_agpstat
|= AGPSTAT2_1X
;
480 /* If we've dropped down to 1X, disable fast writes. */
481 if (*bridge_agpstat
& AGPSTAT2_1X
)
482 *bridge_agpstat
&= ~AGPSTAT_FW
;
486 * requested_mode = Mode requested by (typically) X.
487 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
488 * vga_agpstat = PCI_AGP_STATUS from graphic card.
490 static void agp_v3_parse_one(u32
*requested_mode
, u32
*bridge_agpstat
, u32
*vga_agpstat
)
492 u32 origbridge
=*bridge_agpstat
, origvga
=*vga_agpstat
;
495 if (*requested_mode
& AGP3_RESERVED_MASK
) {
496 printk(KERN_INFO PFX
"reserved bits set (%x) in mode 0x%x. Fixed.\n",
497 *requested_mode
& AGP3_RESERVED_MASK
, *requested_mode
);
498 *requested_mode
&= ~AGP3_RESERVED_MASK
;
501 /* Check the speed bits make sense. */
502 tmp
= *requested_mode
& 7;
504 printk(KERN_INFO PFX
"%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current
->comm
);
505 *requested_mode
|= AGPSTAT3_4X
;
508 printk(KERN_INFO PFX
"%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current
->comm
, tmp
* 4);
509 *requested_mode
= (*requested_mode
& ~7) | AGPSTAT3_8X
;
512 /* ARQSZ - Set the value to the maximum one.
513 * Don't allow the mode register to override values. */
514 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_ARQSZ
) |
515 max_t(u32
,(*bridge_agpstat
& AGPSTAT_ARQSZ
),(*vga_agpstat
& AGPSTAT_ARQSZ
)));
517 /* Calibration cycle.
518 * Don't allow the mode register to override values. */
519 *bridge_agpstat
= ((*bridge_agpstat
& ~AGPSTAT_CAL_MASK
) |
520 min_t(u32
,(*bridge_agpstat
& AGPSTAT_CAL_MASK
),(*vga_agpstat
& AGPSTAT_CAL_MASK
)));
522 /* SBA *must* be supported for AGP v3 */
523 *bridge_agpstat
|= AGPSTAT_SBA
;
527 * Check for invalid speeds. This can happen when applications
528 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
530 if (*requested_mode
& AGPSTAT_MODE_3_0
) {
532 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
533 * have been passed a 3.0 mode, but with 2.x speed bits set.
534 * AGP2.x 4x -> AGP3.0 4x.
536 if (*requested_mode
& AGPSTAT2_4X
) {
537 printk(KERN_INFO PFX
"%s passes broken AGP3 flags (%x). Fixed.\n",
538 current
->comm
, *requested_mode
);
539 *requested_mode
&= ~AGPSTAT2_4X
;
540 *requested_mode
|= AGPSTAT3_4X
;
544 * The caller doesn't know what they are doing. We are in 3.0 mode,
545 * but have been passed an AGP 2.x mode.
546 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
548 printk(KERN_INFO PFX
"%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
549 current
->comm
, *requested_mode
);
550 *requested_mode
&= ~(AGPSTAT2_4X
| AGPSTAT2_2X
| AGPSTAT2_1X
);
551 *requested_mode
|= AGPSTAT3_4X
;
554 if (*requested_mode
& AGPSTAT3_8X
) {
555 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
556 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
557 *bridge_agpstat
|= AGPSTAT3_4X
;
558 printk(KERN_INFO PFX
"%s requested AGPx8 but bridge not capable.\n", current
->comm
);
561 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
562 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
563 *bridge_agpstat
|= AGPSTAT3_4X
;
564 printk(KERN_INFO PFX
"%s requested AGPx8 but graphic card not capable.\n", current
->comm
);
567 /* All set, bridge & device can do AGP x8*/
568 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
571 } else if (*requested_mode
& AGPSTAT3_4X
) {
572 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
573 *bridge_agpstat
|= AGPSTAT3_4X
;
579 * If we didn't specify an AGP mode, we see if both
580 * the graphics card, and the bridge can do x8, and use if so.
581 * If not, we fall back to x4 mode.
583 if ((*bridge_agpstat
& AGPSTAT3_8X
) && (*vga_agpstat
& AGPSTAT3_8X
)) {
584 printk(KERN_INFO PFX
"No AGP mode specified. Setting to highest mode "
585 "supported by bridge & card (x8).\n");
586 *bridge_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
587 *vga_agpstat
&= ~(AGPSTAT3_4X
| AGPSTAT3_RSVD
);
589 printk(KERN_INFO PFX
"Fell back to AGPx4 mode because");
590 if (!(*bridge_agpstat
& AGPSTAT3_8X
)) {
591 printk(KERN_INFO PFX
"bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
592 *bridge_agpstat
, origbridge
);
593 *bridge_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
594 *bridge_agpstat
|= AGPSTAT3_4X
;
596 if (!(*vga_agpstat
& AGPSTAT3_8X
)) {
597 printk(KERN_INFO PFX
"graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
598 *vga_agpstat
, origvga
);
599 *vga_agpstat
&= ~(AGPSTAT3_8X
| AGPSTAT3_RSVD
);
600 *vga_agpstat
|= AGPSTAT3_4X
;
606 /* Apply any errata. */
607 if (agp_bridge
->flags
& AGP_ERRATA_FASTWRITES
)
608 *bridge_agpstat
&= ~AGPSTAT_FW
;
610 if (agp_bridge
->flags
& AGP_ERRATA_SBA
)
611 *bridge_agpstat
&= ~AGPSTAT_SBA
;
613 if (agp_bridge
->flags
& AGP_ERRATA_1X
) {
614 *bridge_agpstat
&= ~(AGPSTAT2_2X
| AGPSTAT2_4X
);
615 *bridge_agpstat
|= AGPSTAT2_1X
;
621 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
622 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
623 * @requested_mode: requested agp_stat from userspace (Typically from X)
624 * @bridge_agpstat: current agp_stat from AGP bridge.
626 * This function will hunt for an AGP graphics card, and try to match
627 * the requested mode to the capabilities of both the bridge and the card.
629 u32
agp_collect_device_status(struct agp_bridge_data
*bridge
, u32 requested_mode
, u32 bridge_agpstat
)
631 struct pci_dev
*device
= NULL
;
636 device
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, device
);
638 printk(KERN_INFO PFX
"Couldn't find an AGP VGA controller.\n");
641 cap_ptr
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
647 * Ok, here we have a AGP device. Disable impossible
648 * settings, and adjust the readqueue to the minimum.
650 pci_read_config_dword(device
, cap_ptr
+PCI_AGP_STATUS
, &vga_agpstat
);
652 /* adjust RQ depth */
653 bridge_agpstat
= ((bridge_agpstat
& ~AGPSTAT_RQ_DEPTH
) |
654 min_t(u32
, (requested_mode
& AGPSTAT_RQ_DEPTH
),
655 min_t(u32
, (bridge_agpstat
& AGPSTAT_RQ_DEPTH
), (vga_agpstat
& AGPSTAT_RQ_DEPTH
))));
657 /* disable FW if it's not supported */
658 if (!((bridge_agpstat
& AGPSTAT_FW
) &&
659 (vga_agpstat
& AGPSTAT_FW
) &&
660 (requested_mode
& AGPSTAT_FW
)))
661 bridge_agpstat
&= ~AGPSTAT_FW
;
663 /* Check to see if we are operating in 3.0 mode */
664 if (agp_bridge
->mode
& AGPSTAT_MODE_3_0
)
665 agp_v3_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
667 agp_v2_parse_one(&requested_mode
, &bridge_agpstat
, &vga_agpstat
);
670 return bridge_agpstat
;
672 EXPORT_SYMBOL(agp_collect_device_status
);
675 void agp_device_command(u32 bridge_agpstat
, int agp_v3
)
677 struct pci_dev
*device
= NULL
;
680 mode
= bridge_agpstat
& 0x7;
684 for_each_pci_dev(device
) {
685 u8 agp
= pci_find_capability(device
, PCI_CAP_ID_AGP
);
689 printk(KERN_INFO PFX
"Putting AGP V%d device at %s into %dx mode\n",
690 agp_v3
? 3 : 2, pci_name(device
), mode
);
691 pci_write_config_dword(device
, agp
+ PCI_AGP_COMMAND
, bridge_agpstat
);
694 EXPORT_SYMBOL(agp_device_command
);
697 void get_agp_version(struct agp_bridge_data
*bridge
)
701 /* Exit early if already set by errata workarounds. */
702 if (bridge
->major_version
!= 0)
705 pci_read_config_dword(bridge
->dev
, bridge
->capndx
, &ncapid
);
706 bridge
->major_version
= (ncapid
>> AGP_MAJOR_VERSION_SHIFT
) & 0xf;
707 bridge
->minor_version
= (ncapid
>> AGP_MINOR_VERSION_SHIFT
) & 0xf;
709 EXPORT_SYMBOL(get_agp_version
);
712 void agp_generic_enable(struct agp_bridge_data
*bridge
, u32 requested_mode
)
714 u32 bridge_agpstat
, temp
;
716 get_agp_version(agp_bridge
);
718 printk(KERN_INFO PFX
"Found an AGP %d.%d compliant device at %s.\n",
719 agp_bridge
->major_version
,
720 agp_bridge
->minor_version
,
721 pci_name(agp_bridge
->dev
));
723 pci_read_config_dword(agp_bridge
->dev
,
724 agp_bridge
->capndx
+ PCI_AGP_STATUS
, &bridge_agpstat
);
726 bridge_agpstat
= agp_collect_device_status(agp_bridge
, requested_mode
, bridge_agpstat
);
727 if (bridge_agpstat
== 0)
728 /* Something bad happened. FIXME: Return error code? */
731 bridge_agpstat
|= AGPSTAT_AGP_ENABLE
;
733 /* Do AGP version specific frobbing. */
734 if (bridge
->major_version
>= 3) {
735 if (bridge
->mode
& AGPSTAT_MODE_3_0
) {
736 /* If we have 3.5, we can do the isoch stuff. */
737 if (bridge
->minor_version
>= 5)
738 agp_3_5_enable(bridge
);
739 agp_device_command(bridge_agpstat
, TRUE
);
742 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
743 bridge_agpstat
&= ~(7<<10) ;
744 pci_read_config_dword(bridge
->dev
,
745 bridge
->capndx
+AGPCTRL
, &temp
);
747 pci_write_config_dword(bridge
->dev
,
748 bridge
->capndx
+AGPCTRL
, temp
);
750 printk(KERN_INFO PFX
"Device is in legacy mode,"
751 " falling back to 2.x\n");
756 agp_device_command(bridge_agpstat
, FALSE
);
758 EXPORT_SYMBOL(agp_generic_enable
);
761 int agp_generic_create_gatt_table(struct agp_bridge_data
*bridge
)
772 /* The generic routines can't handle 2 level gatt's */
773 if (bridge
->driver
->size_type
== LVL2_APER_SIZE
)
777 i
= bridge
->aperture_size_idx
;
778 temp
= bridge
->current_size
;
779 size
= page_order
= num_entries
= 0;
781 if (bridge
->driver
->size_type
!= FIXED_APER_SIZE
) {
783 switch (bridge
->driver
->size_type
) {
785 size
= A_SIZE_8(temp
)->size
;
787 A_SIZE_8(temp
)->page_order
;
789 A_SIZE_8(temp
)->num_entries
;
792 size
= A_SIZE_16(temp
)->size
;
793 page_order
= A_SIZE_16(temp
)->page_order
;
794 num_entries
= A_SIZE_16(temp
)->num_entries
;
797 size
= A_SIZE_32(temp
)->size
;
798 page_order
= A_SIZE_32(temp
)->page_order
;
799 num_entries
= A_SIZE_32(temp
)->num_entries
;
801 /* This case will never really happen. */
802 case FIXED_APER_SIZE
:
805 size
= page_order
= num_entries
= 0;
809 table
= alloc_gatt_pages(page_order
);
813 switch (bridge
->driver
->size_type
) {
815 bridge
->current_size
= A_IDX8(bridge
);
818 bridge
->current_size
= A_IDX16(bridge
);
821 bridge
->current_size
= A_IDX32(bridge
);
823 /* These cases will never really happen. */
824 case FIXED_APER_SIZE
:
829 temp
= bridge
->current_size
;
831 bridge
->aperture_size_idx
= i
;
833 } while (!table
&& (i
< bridge
->driver
->num_aperture_sizes
));
835 size
= ((struct aper_size_info_fixed
*) temp
)->size
;
836 page_order
= ((struct aper_size_info_fixed
*) temp
)->page_order
;
837 num_entries
= ((struct aper_size_info_fixed
*) temp
)->num_entries
;
838 table
= alloc_gatt_pages(page_order
);
844 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
846 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
847 SetPageReserved(page
);
849 bridge
->gatt_table_real
= (u32
*) table
;
850 agp_gatt_table
= (void *)table
;
852 bridge
->driver
->cache_flush();
853 bridge
->gatt_table
= ioremap_nocache(virt_to_gart(table
),
854 (PAGE_SIZE
* (1 << page_order
)));
855 bridge
->driver
->cache_flush();
857 if (bridge
->gatt_table
== NULL
) {
858 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
859 ClearPageReserved(page
);
861 free_gatt_pages(table
, page_order
);
865 bridge
->gatt_bus_addr
= virt_to_gart(bridge
->gatt_table_real
);
867 /* AK: bogus, should encode addresses > 4GB */
868 for (i
= 0; i
< num_entries
; i
++) {
869 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
870 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
875 EXPORT_SYMBOL(agp_generic_create_gatt_table
);
877 int agp_generic_free_gatt_table(struct agp_bridge_data
*bridge
)
880 char *table
, *table_end
;
884 temp
= bridge
->current_size
;
886 switch (bridge
->driver
->size_type
) {
888 page_order
= A_SIZE_8(temp
)->page_order
;
891 page_order
= A_SIZE_16(temp
)->page_order
;
894 page_order
= A_SIZE_32(temp
)->page_order
;
896 case FIXED_APER_SIZE
:
897 page_order
= A_SIZE_FIX(temp
)->page_order
;
900 /* The generic routines can't deal with 2 level gatt's */
908 /* Do not worry about freeing memory, because if this is
909 * called, then all agp memory is deallocated and removed
912 iounmap(bridge
->gatt_table
);
913 table
= (char *) bridge
->gatt_table_real
;
914 table_end
= table
+ ((PAGE_SIZE
* (1 << page_order
)) - 1);
916 for (page
= virt_to_page(table
); page
<= virt_to_page(table_end
); page
++)
917 ClearPageReserved(page
);
919 free_gatt_pages(bridge
->gatt_table_real
, page_order
);
921 agp_gatt_table
= NULL
;
922 bridge
->gatt_table
= NULL
;
923 bridge
->gatt_table_real
= NULL
;
924 bridge
->gatt_bus_addr
= 0;
928 EXPORT_SYMBOL(agp_generic_free_gatt_table
);
931 int agp_generic_insert_memory(struct agp_memory
* mem
, off_t pg_start
, int type
)
937 struct agp_bridge_data
*bridge
;
939 bridge
= mem
->bridge
;
943 temp
= bridge
->current_size
;
945 switch (bridge
->driver
->size_type
) {
947 num_entries
= A_SIZE_8(temp
)->num_entries
;
950 num_entries
= A_SIZE_16(temp
)->num_entries
;
953 num_entries
= A_SIZE_32(temp
)->num_entries
;
955 case FIXED_APER_SIZE
:
956 num_entries
= A_SIZE_FIX(temp
)->num_entries
;
959 /* The generic routines can't deal with 2 level gatt's */
967 num_entries
-= agp_memory_reserved
/PAGE_SIZE
;
968 if (num_entries
< 0) num_entries
= 0;
970 if (type
!= 0 || mem
->type
!= 0) {
971 /* The generic routines know nothing of memory types */
976 if ((pg_start
+ mem
->page_count
) > num_entries
)
981 while (j
< (pg_start
+ mem
->page_count
)) {
982 if (!PGE_EMPTY(bridge
, readl(bridge
->gatt_table
+j
)))
987 if (mem
->is_flushed
== FALSE
) {
988 bridge
->driver
->cache_flush();
989 mem
->is_flushed
= TRUE
;
992 for (i
= 0, j
= pg_start
; i
< mem
->page_count
; i
++, j
++) {
993 writel(bridge
->driver
->mask_memory(bridge
, mem
->memory
[i
], mem
->type
), bridge
->gatt_table
+j
);
994 readl(bridge
->gatt_table
+j
); /* PCI Posting. */
997 bridge
->driver
->tlb_flush(mem
);
1000 EXPORT_SYMBOL(agp_generic_insert_memory
);
1003 int agp_generic_remove_memory(struct agp_memory
*mem
, off_t pg_start
, int type
)
1006 struct agp_bridge_data
*bridge
;
1008 bridge
= mem
->bridge
;
1012 if (type
!= 0 || mem
->type
!= 0) {
1013 /* The generic routines know nothing of memory types */
1017 /* AK: bogus, should encode addresses > 4GB */
1018 for (i
= pg_start
; i
< (mem
->page_count
+ pg_start
); i
++) {
1019 writel(bridge
->scratch_page
, bridge
->gatt_table
+i
);
1020 readl(bridge
->gatt_table
+i
); /* PCI Posting. */
1023 global_cache_flush();
1024 bridge
->driver
->tlb_flush(mem
);
1027 EXPORT_SYMBOL(agp_generic_remove_memory
);
1030 struct agp_memory
*agp_generic_alloc_by_type(size_t page_count
, int type
)
1034 EXPORT_SYMBOL(agp_generic_alloc_by_type
);
1037 void agp_generic_free_by_type(struct agp_memory
*curr
)
1039 vfree(curr
->memory
);
1040 agp_free_key(curr
->key
);
1043 EXPORT_SYMBOL(agp_generic_free_by_type
);
1047 * Basic Page Allocation Routines -
1048 * These routines handle page allocation and by default they reserve the allocated
1049 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1050 * against a maximum value.
1053 void *agp_generic_alloc_page(struct agp_bridge_data
*bridge
)
1057 page
= alloc_page(GFP_KERNEL
);
1061 map_page_into_agp(page
);
1064 SetPageLocked(page
);
1065 atomic_inc(&agp_bridge
->current_memory_agp
);
1066 return page_address(page
);
1068 EXPORT_SYMBOL(agp_generic_alloc_page
);
1071 void agp_generic_destroy_page(void *addr
)
1078 page
= virt_to_page(addr
);
1079 unmap_page_from_agp(page
);
1082 free_page((unsigned long)addr
);
1083 atomic_dec(&agp_bridge
->current_memory_agp
);
1085 EXPORT_SYMBOL(agp_generic_destroy_page
);
1087 /* End Basic Page Allocation Routines */
1091 * agp_enable - initialise the agp point-to-point connection.
1093 * @mode: agp mode register value to configure with.
1095 void agp_enable(struct agp_bridge_data
*bridge
, u32 mode
)
1099 bridge
->driver
->agp_enable(bridge
, mode
);
1101 EXPORT_SYMBOL(agp_enable
);
1103 /* When we remove the global variable agp_bridge from all drivers
1104 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1107 struct agp_bridge_data
*agp_generic_find_bridge(struct pci_dev
*pdev
)
1109 if (list_empty(&agp_bridges
))
1115 static void ipi_handler(void *null
)
1120 void global_cache_flush(void)
1122 if (on_each_cpu(ipi_handler
, NULL
, 1, 1) != 0)
1123 panic(PFX
"timed out waiting for the other CPUs!\n");
1125 EXPORT_SYMBOL(global_cache_flush
);
1127 unsigned long agp_generic_mask_memory(struct agp_bridge_data
*bridge
,
1128 unsigned long addr
, int type
)
1130 /* memory type is ignored in the generic routine */
1131 if (bridge
->driver
->masks
)
1132 return addr
| bridge
->driver
->masks
[0].mask
;
1136 EXPORT_SYMBOL(agp_generic_mask_memory
);
1139 * These functions are implemented according to the AGPv3 spec,
1140 * which covers implementation details that had previously been
1144 int agp3_generic_fetch_size(void)
1148 struct aper_size_info_16
*values
;
1150 pci_read_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, &temp_size
);
1151 values
= A_SIZE_16(agp_bridge
->driver
->aperture_sizes
);
1153 for (i
= 0; i
< agp_bridge
->driver
->num_aperture_sizes
; i
++) {
1154 if (temp_size
== values
[i
].size_value
) {
1155 agp_bridge
->previous_size
=
1156 agp_bridge
->current_size
= (void *) (values
+ i
);
1158 agp_bridge
->aperture_size_idx
= i
;
1159 return values
[i
].size
;
1164 EXPORT_SYMBOL(agp3_generic_fetch_size
);
1166 void agp3_generic_tlbflush(struct agp_memory
*mem
)
1169 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1170 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_GTLBEN
);
1171 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
);
1173 EXPORT_SYMBOL(agp3_generic_tlbflush
);
1175 int agp3_generic_configure(void)
1178 struct aper_size_info_16
*current_size
;
1180 current_size
= A_SIZE_16(agp_bridge
->current_size
);
1182 pci_read_config_dword(agp_bridge
->dev
, AGP_APBASE
, &temp
);
1183 agp_bridge
->gart_bus_addr
= (temp
& PCI_BASE_ADDRESS_MEM_MASK
);
1185 /* set aperture size */
1186 pci_write_config_word(agp_bridge
->dev
, agp_bridge
->capndx
+AGPAPSIZE
, current_size
->size_value
);
1187 /* set gart pointer */
1188 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPGARTLO
, agp_bridge
->gatt_bus_addr
);
1189 /* enable aperture and GTLB */
1190 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &temp
);
1191 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, temp
| AGPCTRL_APERENB
| AGPCTRL_GTLBEN
);
1194 EXPORT_SYMBOL(agp3_generic_configure
);
1196 void agp3_generic_cleanup(void)
1199 pci_read_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, &ctrl
);
1200 pci_write_config_dword(agp_bridge
->dev
, agp_bridge
->capndx
+AGPCTRL
, ctrl
& ~AGPCTRL_APERENB
);
1202 EXPORT_SYMBOL(agp3_generic_cleanup
);
1204 struct aper_size_info_16 agp3_generic_sizes
[AGP_GENERIC_SIZES_ENTRIES
] =
1206 {4096, 1048576, 10,0x000},
1207 {2048, 524288, 9, 0x800},
1208 {1024, 262144, 8, 0xc00},
1209 { 512, 131072, 7, 0xe00},
1210 { 256, 65536, 6, 0xf00},
1211 { 128, 32768, 5, 0xf20},
1212 { 64, 16384, 4, 0xf30},
1213 { 32, 8192, 3, 0xf38},
1214 { 16, 4096, 2, 0xf3c},
1215 { 8, 2048, 1, 0xf3e},
1216 { 4, 1024, 0, 0xf3f}
1218 EXPORT_SYMBOL(agp3_generic_sizes
);