3 * Copyright (C) 2002-2004 Dave Jones.
4 * Copyright (C) 1999 Jeff Hartmann.
5 * Copyright (C) 1999 Precision Insight, Inc.
6 * Copyright (C) 1999 Xi Graphics, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
24 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 #include <linux/config.h>
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>
40 #include <asm/cacheflush.h>
41 #include <asm/pgtable.h>
44 __u32 *agp_gatt_table;
45 int agp_memory_reserved;
48 * Needed by the Nforce GART driver for the time being. Would be
49 * nice to do this some other way instead of needing this export.
51 EXPORT_SYMBOL_GPL(agp_memory_reserved);
53 #if defined(CONFIG_X86)
54 int map_page_into_agp(struct page *page)
57 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
61 EXPORT_SYMBOL_GPL(map_page_into_agp);
63 int unmap_page_from_agp(struct page *page)
66 i = change_page_attr(page, 1, PAGE_KERNEL);
70 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
74 * Generic routines for handling agp_memory structures -
75 * They use the basic page allocation routines to do the brunt of the work.
78 void agp_free_key(int key)
84 clear_bit(key, agp_bridge->key_list);
86 EXPORT_SYMBOL(agp_free_key);
89 static int agp_get_key(void)
93 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
95 set_bit(bit, agp_bridge->key_list);
102 struct agp_memory *agp_create_memory(int scratch_pages)
104 struct agp_memory *new;
106 new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
111 memset(new, 0, sizeof(struct agp_memory));
112 new->key = agp_get_key();
118 new->memory = vmalloc(PAGE_SIZE * scratch_pages);
120 if (new->memory == NULL) {
121 agp_free_key(new->key);
125 new->num_scratch_pages = scratch_pages;
128 EXPORT_SYMBOL(agp_create_memory);
131 * agp_free_memory - free memory associated with an agp_memory pointer.
133 * @curr: agp_memory pointer to be freed.
135 * It is the only function that can be called when the backend is not owned
136 * by the caller. (So it can free memory on client death.)
138 void agp_free_memory(struct agp_memory *curr)
142 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
145 if (curr->is_bound == TRUE)
146 agp_unbind_memory(curr);
148 if (curr->type != 0) {
149 agp_bridge->driver->free_by_type(curr);
152 if (curr->page_count != 0) {
153 for (i = 0; i < curr->page_count; i++) {
154 agp_bridge->driver->agp_destroy_page(phys_to_virt(curr->memory[i]));
157 agp_free_key(curr->key);
161 EXPORT_SYMBOL(agp_free_memory);
163 #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
166 * agp_allocate_memory - allocate a group of pages of a certain type.
168 * @page_count: size_t argument of the number of pages
169 * @type: u32 argument of the type of memory to be allocated.
171 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
172 * maps to physical ram. Any other type is device dependent.
174 * It returns NULL whenever memory is unavailable.
176 struct agp_memory *agp_allocate_memory(size_t page_count, u32 type)
179 struct agp_memory *new;
182 if (agp_bridge->type == NOT_SUPPORTED)
185 if ((atomic_read(&agp_bridge->current_memory_agp) + page_count) > agp_bridge->max_memory_agp)
189 new = agp_bridge->driver->alloc_by_type(page_count, type);
193 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
195 new = agp_create_memory(scratch_pages);
200 for (i = 0; i < page_count; i++) {
201 void *addr = agp_bridge->driver->agp_alloc_page();
204 agp_free_memory(new);
208 agp_bridge->driver->mask_memory(virt_to_phys(addr), type);
212 flush_agp_mappings();
216 EXPORT_SYMBOL(agp_allocate_memory);
219 /* End - Generic routines for handling agp_memory structures */
222 static int agp_return_size(void)
227 temp = agp_bridge->current_size;
229 switch (agp_bridge->driver->size_type) {
231 current_size = A_SIZE_8(temp)->size;
234 current_size = A_SIZE_16(temp)->size;
237 current_size = A_SIZE_32(temp)->size;
240 current_size = A_SIZE_LVL2(temp)->size;
242 case FIXED_APER_SIZE:
243 current_size = A_SIZE_FIX(temp)->size;
250 current_size -= (agp_memory_reserved / (1024*1024));
257 int agp_num_entries(void)
262 temp = agp_bridge->current_size;
264 switch (agp_bridge->driver->size_type) {
266 num_entries = A_SIZE_8(temp)->num_entries;
269 num_entries = A_SIZE_16(temp)->num_entries;
272 num_entries = A_SIZE_32(temp)->num_entries;
275 num_entries = A_SIZE_LVL2(temp)->num_entries;
277 case FIXED_APER_SIZE:
278 num_entries = A_SIZE_FIX(temp)->num_entries;
285 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
290 EXPORT_SYMBOL_GPL(agp_num_entries);
294 * agp_copy_info - copy bridge state information
296 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
298 * This function copies information about the agp bridge device and the state of
299 * the agp backend into an agp_kern_info pointer.
301 int agp_copy_info(struct agp_kern_info *info)
303 memset(info, 0, sizeof(struct agp_kern_info));
304 if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
305 !agp_bridge->version) {
306 info->chipset = NOT_SUPPORTED;
310 info->version.major = agp_bridge->version->major;
311 info->version.minor = agp_bridge->version->minor;
312 info->chipset = agp_bridge->type;
313 info->device = agp_bridge->dev;
314 info->mode = agp_bridge->mode;
315 info->aper_base = agp_bridge->gart_bus_addr;
316 info->aper_size = agp_return_size();
317 info->max_memory = agp_bridge->max_memory_agp;
318 info->current_memory = atomic_read(&agp_bridge->current_memory_agp);
319 info->cant_use_aperture = agp_bridge->driver->cant_use_aperture;
320 info->vm_ops = agp_bridge->vm_ops;
321 info->page_mask = ~0UL;
324 EXPORT_SYMBOL(agp_copy_info);
327 /* End - Routine to copy over information structure */
331 * Routines for handling swapping of agp_memory into the GATT -
332 * These routines take agp_memory and insert them into the GATT.
333 * They call device specific routines to actually write to the GATT.
337 * agp_bind_memory - Bind an agp_memory structure into the GATT.
339 * @curr: agp_memory pointer
340 * @pg_start: an offset into the graphics aperture translation table
342 * It returns -EINVAL if the pointer == NULL.
343 * It returns -EBUSY if the area of the table requested is already in use.
345 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
349 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
352 if (curr->is_bound == TRUE) {
353 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
356 if (curr->is_flushed == FALSE) {
357 agp_bridge->driver->cache_flush();
358 curr->is_flushed = TRUE;
360 ret_val = agp_bridge->driver->insert_memory(curr, pg_start, curr->type);
365 curr->is_bound = TRUE;
366 curr->pg_start = pg_start;
369 EXPORT_SYMBOL(agp_bind_memory);
373 * agp_unbind_memory - Removes an agp_memory structure from the GATT
375 * @curr: agp_memory pointer to be removed from the GATT.
377 * It returns -EINVAL if this piece of agp_memory is not currently bound to
378 * the graphics aperture translation table or if the agp_memory pointer == NULL
380 int agp_unbind_memory(struct agp_memory *curr)
384 if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
387 if (curr->is_bound != TRUE) {
388 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
392 ret_val = agp_bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
397 curr->is_bound = FALSE;
401 EXPORT_SYMBOL(agp_unbind_memory);
403 /* End - Routines for handling swapping of agp_memory into the GATT */
406 /* Generic Agp routines - Start */
407 static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
409 /* disable SBA if it's not supported */
410 if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
411 *cmd &= ~AGPSTAT_SBA;
414 if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
415 *cmd &= ~AGPSTAT2_4X;
417 if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
418 *cmd &= ~AGPSTAT2_2X;
420 if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
421 *cmd &= ~AGPSTAT2_1X;
423 /* Now we know what mode it should be, clear out the unwanted bits. */
424 if (*cmd & AGPSTAT2_4X)
425 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
427 if (*cmd & AGPSTAT2_2X)
428 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
430 if (*cmd & AGPSTAT2_1X)
431 *cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
435 * mode = requested mode.
436 * cmd = PCI_AGP_STATUS from agp bridge.
437 * tmp = PCI_AGP_STATUS from graphic card.
439 static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
441 u32 origcmd=*cmd, origtmp=*tmp;
443 /* ARQSZ - Set the value to the maximum one.
444 * Don't allow the mode register to override values. */
445 *cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
446 max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
448 /* Calibration cycle.
449 * Don't allow the mode register to override values. */
450 *cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
451 min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
453 /* SBA *must* be supported for AGP v3 */
458 * Check for invalid speeds. This can happen when applications
459 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
461 if (*mode & AGPSTAT_MODE_3_0) {
463 * Caller hasn't a clue what its doing. We are in 3.0 mode,
464 * have been passed a 3.0 mode, but with 2.x speed bits set.
465 * AGP2.x 4x -> AGP3.0 4x.
467 if (*mode & AGPSTAT2_4X) {
468 printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
469 current->comm, *mode);
470 *mode &= ~AGPSTAT2_4X;
471 *mode |= AGPSTAT3_4X;
475 * The caller doesn't know what they are doing. We are in 3.0 mode,
476 * but have been passed an AGP 2.x mode.
477 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
479 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
480 current->comm, *mode);
481 *mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
482 *mode |= AGPSTAT3_4X;
485 if (*mode & AGPSTAT3_8X) {
486 if (!(*cmd & AGPSTAT3_8X)) {
487 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
489 printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
492 if (!(*tmp & AGPSTAT3_8X)) {
493 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
495 printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
498 /* All set, bridge & device can do AGP x8*/
499 *cmd &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
505 * If we didn't specify AGPx8, we can only do x4.
506 * If the hardware can't do x4, we're up shit creek, and never
507 * should have got this far.
509 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
510 if ((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X))
513 printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
514 "[cmd:%x tmp:%x fell back to:- cmd:%x tmp:%x]\n",
515 origcmd, origtmp, *cmd, *tmp);
516 if (!(*cmd & AGPSTAT3_4X))
517 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
518 if (!(*tmp & AGPSTAT3_4X))
519 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
524 //FIXME: This doesn't smell right.
525 //We need a function we pass an agp_device to.
526 u32 agp_collect_device_status(u32 mode, u32 cmd)
528 struct pci_dev *device = NULL;
533 while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
534 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
538 //FIXME: We should probably skip anything here that
539 // isn't an AGP graphic card.
541 * Ok, here we have a AGP device. Disable impossible
542 * settings, and adjust the readqueue to the minimum.
544 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
546 /* adjust RQ depth */
547 cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
548 min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
549 min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
551 /* disable FW if it's not supported */
552 if (!((cmd & AGPSTAT_FW) && (tmp & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
555 /* Check to see if we are operating in 3.0 mode */
556 pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
557 if (agp3 & AGPSTAT_MODE_3_0) {
558 agp_v3_parse_one(&mode, &cmd, &tmp);
560 agp_v2_parse_one(&mode, &cmd, &tmp);
565 EXPORT_SYMBOL(agp_collect_device_status);
568 void agp_device_command(u32 command, int agp_v3)
570 struct pci_dev *device = NULL;
573 mode = command & 0x7;
577 while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
578 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
582 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
583 agp_v3 ? 3 : 2, pci_name(device), mode);
584 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, command);
587 EXPORT_SYMBOL(agp_device_command);
590 void get_agp_version(struct agp_bridge_data *bridge)
594 /* Exit early if already set by errata workarounds. */
595 if (agp_bridge->major_version != 0)
598 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
599 agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
600 agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
602 EXPORT_SYMBOL(get_agp_version);
605 void agp_generic_enable(u32 mode)
610 get_agp_version(agp_bridge);
612 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
613 agp_bridge->major_version,
614 agp_bridge->minor_version,
615 agp_bridge->dev->slot_name);
617 pci_read_config_dword(agp_bridge->dev,
618 agp_bridge->capndx + PCI_AGP_STATUS, &command);
620 command = agp_collect_device_status(mode, command);
621 command |= AGPSTAT_AGP_ENABLE;
623 /* Do AGP version specific frobbing. */
624 if(agp_bridge->major_version >= 3) {
625 pci_read_config_dword(agp_bridge->dev,
626 agp_bridge->capndx+AGPSTAT, &agp3);
628 /* Check to see if we are operating in 3.0 mode */
629 if (agp3 & AGPSTAT_MODE_3_0) {
630 /* If we have 3.5, we can do the isoch stuff. */
631 if (agp_bridge->minor_version >= 5)
632 agp_3_5_enable(agp_bridge);
633 agp_device_command(command, TRUE);
636 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
637 command &= ~(7<<10) ;
638 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
640 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp);
642 printk (KERN_INFO PFX "Device is in legacy mode,"
643 " falling back to 2.x\n");
648 agp_device_command(command, FALSE);
650 EXPORT_SYMBOL(agp_generic_enable);
653 int agp_generic_create_gatt_table(void)
664 /* The generic routines can't handle 2 level gatt's */
665 if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
669 i = agp_bridge->aperture_size_idx;
670 temp = agp_bridge->current_size;
671 size = page_order = num_entries = 0;
673 if (agp_bridge->driver->size_type != FIXED_APER_SIZE) {
675 switch (agp_bridge->driver->size_type) {
677 size = A_SIZE_8(temp)->size;
679 A_SIZE_8(temp)->page_order;
681 A_SIZE_8(temp)->num_entries;
684 size = A_SIZE_16(temp)->size;
685 page_order = A_SIZE_16(temp)->page_order;
686 num_entries = A_SIZE_16(temp)->num_entries;
689 size = A_SIZE_32(temp)->size;
690 page_order = A_SIZE_32(temp)->page_order;
691 num_entries = A_SIZE_32(temp)->num_entries;
693 /* This case will never really happen. */
694 case FIXED_APER_SIZE:
697 size = page_order = num_entries = 0;
701 table = (char *) __get_free_pages(GFP_KERNEL,
706 switch (agp_bridge->driver->size_type) {
708 agp_bridge->current_size = A_IDX8(agp_bridge);
711 agp_bridge->current_size = A_IDX16(agp_bridge);
714 agp_bridge->current_size = A_IDX32(agp_bridge);
716 /* This case will never really happen. */
717 case FIXED_APER_SIZE:
720 agp_bridge->current_size =
721 agp_bridge->current_size;
724 temp = agp_bridge->current_size;
726 agp_bridge->aperture_size_idx = i;
728 } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
730 size = ((struct aper_size_info_fixed *) temp)->size;
731 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
732 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
733 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
739 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
741 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
742 SetPageReserved(page);
744 agp_bridge->gatt_table_real = (u32 *) table;
745 agp_gatt_table = (void *)table;
747 agp_bridge->driver->cache_flush();
748 agp_bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
749 (PAGE_SIZE * (1 << page_order)));
750 agp_bridge->driver->cache_flush();
752 if (agp_bridge->gatt_table == NULL) {
753 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
754 ClearPageReserved(page);
756 free_pages((unsigned long) table, page_order);
760 agp_bridge->gatt_bus_addr = virt_to_phys(agp_bridge->gatt_table_real);
762 /* AK: bogus, should encode addresses > 4GB */
763 for (i = 0; i < num_entries; i++) {
764 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
765 readl(agp_bridge->gatt_table+i); /* PCI Posting. */
770 EXPORT_SYMBOL(agp_generic_create_gatt_table);
772 int agp_generic_free_gatt_table(void)
775 char *table, *table_end;
779 temp = agp_bridge->current_size;
781 switch (agp_bridge->driver->size_type) {
783 page_order = A_SIZE_8(temp)->page_order;
786 page_order = A_SIZE_16(temp)->page_order;
789 page_order = A_SIZE_32(temp)->page_order;
791 case FIXED_APER_SIZE:
792 page_order = A_SIZE_FIX(temp)->page_order;
795 /* The generic routines can't deal with 2 level gatt's */
803 /* Do not worry about freeing memory, because if this is
804 * called, then all agp memory is deallocated and removed
807 iounmap(agp_bridge->gatt_table);
808 table = (char *) agp_bridge->gatt_table_real;
809 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
811 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
812 ClearPageReserved(page);
814 free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
816 agp_gatt_table = NULL;
817 agp_bridge->gatt_table = NULL;
818 agp_bridge->gatt_table_real = NULL;
819 agp_bridge->gatt_bus_addr = 0;
823 EXPORT_SYMBOL(agp_generic_free_gatt_table);
826 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
833 temp = agp_bridge->current_size;
835 switch (agp_bridge->driver->size_type) {
837 num_entries = A_SIZE_8(temp)->num_entries;
840 num_entries = A_SIZE_16(temp)->num_entries;
843 num_entries = A_SIZE_32(temp)->num_entries;
845 case FIXED_APER_SIZE:
846 num_entries = A_SIZE_FIX(temp)->num_entries;
849 /* The generic routines can't deal with 2 level gatt's */
857 num_entries -= agp_memory_reserved/PAGE_SIZE;
858 if (num_entries < 0) num_entries = 0;
860 if (type != 0 || mem->type != 0) {
861 /* The generic routines know nothing of memory types */
866 if ((pg_start + mem->page_count) > num_entries)
871 while (j < (pg_start + mem->page_count)) {
872 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
877 if (mem->is_flushed == FALSE) {
878 agp_bridge->driver->cache_flush();
879 mem->is_flushed = TRUE;
882 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
883 writel(agp_bridge->driver->mask_memory(mem->memory[i], mem->type), agp_bridge->gatt_table+j);
884 readl(agp_bridge->gatt_table+j); /* PCI Posting. */
887 agp_bridge->driver->tlb_flush(mem);
890 EXPORT_SYMBOL(agp_generic_insert_memory);
893 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
897 if (type != 0 || mem->type != 0) {
898 /* The generic routines know nothing of memory types */
902 /* AK: bogus, should encode addresses > 4GB */
903 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
904 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
905 readl(agp_bridge->gatt_table+i); /* PCI Posting. */
908 global_cache_flush();
909 agp_bridge->driver->tlb_flush(mem);
912 EXPORT_SYMBOL(agp_generic_remove_memory);
915 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
919 EXPORT_SYMBOL(agp_generic_alloc_by_type);
922 void agp_generic_free_by_type(struct agp_memory *curr)
924 if (curr->memory != NULL)
927 agp_free_key(curr->key);
930 EXPORT_SYMBOL(agp_generic_free_by_type);
934 * Basic Page Allocation Routines -
935 * These routines handle page allocation and by default they reserve the allocated
936 * memory. They also handle incrementing the current_memory_agp value, Which is checked
937 * against a maximum value.
940 void *agp_generic_alloc_page(void)
944 page = alloc_page(GFP_KERNEL);
948 map_page_into_agp(page);
952 atomic_inc(&agp_bridge->current_memory_agp);
953 return page_address(page);
955 EXPORT_SYMBOL(agp_generic_alloc_page);
958 void agp_generic_destroy_page(void *addr)
965 page = virt_to_page(addr);
966 unmap_page_from_agp(page);
969 free_page((unsigned long)addr);
970 atomic_dec(&agp_bridge->current_memory_agp);
972 EXPORT_SYMBOL(agp_generic_destroy_page);
974 /* End Basic Page Allocation Routines */
978 * agp_enable - initialise the agp point-to-point connection.
980 * @mode: agp mode register value to configure with.
982 void agp_enable(u32 mode)
984 if (agp_bridge->type == NOT_SUPPORTED)
986 agp_bridge->driver->agp_enable(mode);
988 EXPORT_SYMBOL(agp_enable);
992 static void ipi_handler(void *null)
998 void global_cache_flush(void)
1001 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1002 panic(PFX "timed out waiting for the other CPUs!\n");
1007 EXPORT_SYMBOL(global_cache_flush);
1009 unsigned long agp_generic_mask_memory(unsigned long addr, int type)
1011 /* memory type is ignored in the generic routine */
1012 if (agp_bridge->driver->masks)
1013 return addr | agp_bridge->driver->masks[0].mask;
1017 EXPORT_SYMBOL(agp_generic_mask_memory);
1020 * These functions are implemented according to the AGPv3 spec,
1021 * which covers implementation details that had previously been
1025 int agp3_generic_fetch_size(void)
1029 struct aper_size_info_16 *values;
1031 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1032 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1034 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1035 if (temp_size == values[i].size_value) {
1036 agp_bridge->previous_size =
1037 agp_bridge->current_size = (void *) (values + i);
1039 agp_bridge->aperture_size_idx = i;
1040 return values[i].size;
1045 EXPORT_SYMBOL(agp3_generic_fetch_size);
1047 void agp3_generic_tlbflush(struct agp_memory *mem)
1050 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1051 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1052 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1054 EXPORT_SYMBOL(agp3_generic_tlbflush);
1056 int agp3_generic_configure(void)
1059 struct aper_size_info_16 *current_size;
1061 current_size = A_SIZE_16(agp_bridge->current_size);
1063 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1064 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1066 /* set aperture size */
1067 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1068 /* set gart pointer */
1069 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1070 /* enable aperture and GTLB */
1071 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1072 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1075 EXPORT_SYMBOL(agp3_generic_configure);
1077 void agp3_generic_cleanup(void)
1080 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1081 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1083 EXPORT_SYMBOL(agp3_generic_cleanup);
1085 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1087 {4096, 1048576, 10,0x000},
1088 {2048, 524288, 9, 0x800},
1089 {1024, 262144, 8, 0xc00},
1090 { 512, 131072, 7, 0xe00},
1091 { 256, 65536, 6, 0xf00},
1092 { 128, 32768, 5, 0xf20},
1093 { 64, 16384, 4, 0xf30},
1094 { 32, 8192, 3, 0xf38},
1095 { 16, 4096, 2, 0xf3c},
1096 { 8, 2048, 1, 0xf3e},
1097 { 4, 1024, 0, 0xf3f}
1099 EXPORT_SYMBOL(agp3_generic_sizes);