blob: ac9da0ca36b7b1425a679ab74f3277e008ba661b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
31#include <linux/module.h>
32#include <linux/pci.h>
33#include <linux/init.h>
34#include <linux/pagemap.h>
35#include <linux/miscdevice.h>
36#include <linux/pm.h>
37#include <linux/agp_backend.h>
38#include <linux/vmalloc.h>
39#include <linux/dma-mapping.h>
40#include <linux/mm.h>
41#include <asm/io.h>
42#include <asm/cacheflush.h>
43#include <asm/pgtable.h>
44#include "agp.h"
45
46__u32 *agp_gatt_table;
47int agp_memory_reserved;
48
49/*
50 * Needed by the Nforce GART driver for the time being. Would be
51 * nice to do this some other way instead of needing this export.
52 */
53EXPORT_SYMBOL_GPL(agp_memory_reserved);
54
55#if defined(CONFIG_X86)
56int map_page_into_agp(struct page *page)
57{
58 int i;
59 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
60 global_flush_tlb();
61 return i;
62}
63EXPORT_SYMBOL_GPL(map_page_into_agp);
64
65int unmap_page_from_agp(struct page *page)
66{
67 int i;
68 i = change_page_attr(page, 1, PAGE_KERNEL);
69 global_flush_tlb();
70 return i;
71}
72EXPORT_SYMBOL_GPL(unmap_page_from_agp);
73#endif
74
75/*
76 * Generic routines for handling agp_memory structures -
77 * They use the basic page allocation routines to do the brunt of the work.
78 */
79
80void agp_free_key(int key)
81{
82 if (key < 0)
83 return;
84
85 if (key < MAXKEY)
86 clear_bit(key, agp_bridge->key_list);
87}
88EXPORT_SYMBOL(agp_free_key);
89
90
91static int agp_get_key(void)
92{
93 int bit;
94
95 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
96 if (bit < MAXKEY) {
97 set_bit(bit, agp_bridge->key_list);
98 return bit;
99 }
100 return -1;
101}
102
103
104struct agp_memory *agp_create_memory(int scratch_pages)
105{
106 struct agp_memory *new;
107
108 new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
109
110 if (new == NULL)
111 return NULL;
112
113 memset(new, 0, sizeof(struct agp_memory));
114 new->key = agp_get_key();
115
116 if (new->key < 0) {
117 kfree(new);
118 return NULL;
119 }
120 new->memory = vmalloc(PAGE_SIZE * scratch_pages);
121
122 if (new->memory == NULL) {
123 agp_free_key(new->key);
124 kfree(new);
125 return NULL;
126 }
127 new->num_scratch_pages = scratch_pages;
128 return new;
129}
130EXPORT_SYMBOL(agp_create_memory);
131
132/**
133 * agp_free_memory - free memory associated with an agp_memory pointer.
134 *
135 * @curr: agp_memory pointer to be freed.
136 *
137 * It is the only function that can be called when the backend is not owned
138 * by the caller. (So it can free memory on client death.)
139 */
140void agp_free_memory(struct agp_memory *curr)
141{
142 size_t i;
143
144 if (curr == NULL)
145 return;
146
147 if (curr->is_bound == TRUE)
148 agp_unbind_memory(curr);
149
150 if (curr->type != 0) {
151 curr->bridge->driver->free_by_type(curr);
152 return;
153 }
154 if (curr->page_count != 0) {
155 for (i = 0; i < curr->page_count; i++) {
Keir Fraser07eee782005-03-30 13:17:04 -0800156 curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158 }
159 agp_free_key(curr->key);
160 vfree(curr->memory);
161 kfree(curr);
162}
163EXPORT_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 */
178struct 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 }
Keir Fraser07eee782005-03-30 13:17:04 -0800212 new->memory[i] = virt_to_gart(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 new->page_count++;
214 }
215 new->bridge = bridge;
216
217 flush_agp_mappings();
218
219 return new;
220}
221EXPORT_SYMBOL(agp_allocate_memory);
222
223
224/* End - Generic routines for handling agp_memory structures */
225
226
227static 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
262int 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}
295EXPORT_SYMBOL_GPL(agp_num_entries);
296
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298/**
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 */
306int 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;
David Mosberger66bb8bf2005-04-04 13:29:43 -0700318 if (bridge->mode & AGPSTAT_MODE_3_0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
320 else
321 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 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}
331EXPORT_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 */
350int 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) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700358 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 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}
374EXPORT_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 */
385int 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) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700393 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 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}
406EXPORT_SYMBOL(agp_unbind_memory);
407
408/* End - Routines for handling swapping of agp_memory into the GATT */
409
410
411/* Generic Agp routines - Start */
412static 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) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700417 printk(KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 *requested_mode &= ~AGP2_RESERVED_MASK;
419 }
420
421 /* Check the speed bits make sense. Only one should be set. */
422 tmp = *requested_mode & 7;
423 switch (tmp) {
424 case 0:
Dave Jones8c8b8382005-08-17 23:08:11 -0700425 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 *requested_mode |= AGPSTAT2_1X;
427 break;
428 case 1:
429 case 2:
430 break;
431 case 3:
432 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
433 break;
434 case 4:
435 break;
436 case 5:
437 case 6:
438 case 7:
439 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
440 break;
441 }
442
443 /* disable SBA if it's not supported */
444 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
445 *bridge_agpstat &= ~AGPSTAT_SBA;
446
447 /* Set rate */
448 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
449 *bridge_agpstat &= ~AGPSTAT2_4X;
450
451 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
452 *bridge_agpstat &= ~AGPSTAT2_2X;
453
454 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
455 *bridge_agpstat &= ~AGPSTAT2_1X;
456
457 /* Now we know what mode it should be, clear out the unwanted bits. */
458 if (*bridge_agpstat & AGPSTAT2_4X)
459 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
460
461 if (*bridge_agpstat & AGPSTAT2_2X)
462 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
463
464 if (*bridge_agpstat & AGPSTAT2_1X)
465 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
466
467 /* Apply any errata. */
468 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
469 *bridge_agpstat &= ~AGPSTAT_FW;
470
471 if (agp_bridge->flags & AGP_ERRATA_SBA)
472 *bridge_agpstat &= ~AGPSTAT_SBA;
473
474 if (agp_bridge->flags & AGP_ERRATA_1X) {
475 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
476 *bridge_agpstat |= AGPSTAT2_1X;
477 }
478
479 /* If we've dropped down to 1X, disable fast writes. */
480 if (*bridge_agpstat & AGPSTAT2_1X)
481 *bridge_agpstat &= ~AGPSTAT_FW;
482}
483
484/*
485 * requested_mode = Mode requested by (typically) X.
486 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
487 * vga_agpstat = PCI_AGP_STATUS from graphic card.
488 */
489static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
490{
491 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
492 u32 tmp;
493
494 if (*requested_mode & AGP3_RESERVED_MASK) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700495 printk(KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 *requested_mode &= ~AGP3_RESERVED_MASK;
497 }
498
499 /* Check the speed bits make sense. */
500 tmp = *requested_mode & 7;
501 if (tmp == 0) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700502 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 *requested_mode |= AGPSTAT3_4X;
504 }
505 if (tmp >= 3) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700506 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
508 }
509
510 /* ARQSZ - Set the value to the maximum one.
511 * Don't allow the mode register to override values. */
512 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
513 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
514
515 /* Calibration cycle.
516 * Don't allow the mode register to override values. */
517 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
518 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
519
520 /* SBA *must* be supported for AGP v3 */
521 *bridge_agpstat |= AGPSTAT_SBA;
522
523 /*
524 * Set speed.
525 * Check for invalid speeds. This can happen when applications
526 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
527 */
528 if (*requested_mode & AGPSTAT_MODE_3_0) {
529 /*
530 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
531 * have been passed a 3.0 mode, but with 2.x speed bits set.
532 * AGP2.x 4x -> AGP3.0 4x.
533 */
534 if (*requested_mode & AGPSTAT2_4X) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700535 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 current->comm, *requested_mode);
537 *requested_mode &= ~AGPSTAT2_4X;
538 *requested_mode |= AGPSTAT3_4X;
539 }
540 } else {
541 /*
542 * The caller doesn't know what they are doing. We are in 3.0 mode,
543 * but have been passed an AGP 2.x mode.
544 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
545 */
Dave Jones8c8b8382005-08-17 23:08:11 -0700546 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 current->comm, *requested_mode);
548 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
549 *requested_mode |= AGPSTAT3_4X;
550 }
551
552 if (*requested_mode & AGPSTAT3_8X) {
553 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
554 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
555 *bridge_agpstat |= AGPSTAT3_4X;
Dave Jones8c8b8382005-08-17 23:08:11 -0700556 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 return;
558 }
559 if (!(*vga_agpstat & AGPSTAT3_8X)) {
560 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
561 *bridge_agpstat |= AGPSTAT3_4X;
Dave Jones8c8b8382005-08-17 23:08:11 -0700562 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 return;
564 }
565 /* All set, bridge & device can do AGP x8*/
566 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
567 goto done;
568
569 } else {
570
571 /*
572 * If we didn't specify AGPx8, we can only do x4.
573 * If the hardware can't do x4, we're up shit creek, and never
574 * should have got this far.
575 */
576 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
577 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
578 *bridge_agpstat |= AGPSTAT3_4X;
579 else {
Dave Jones8c8b8382005-08-17 23:08:11 -0700580 printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
582 origbridge, origvga, *bridge_agpstat, *vga_agpstat);
583 if (!(*bridge_agpstat & AGPSTAT3_4X))
Dave Jones8c8b8382005-08-17 23:08:11 -0700584 printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (!(*vga_agpstat & AGPSTAT3_4X))
Dave Jones8c8b8382005-08-17 23:08:11 -0700586 printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return;
588 }
589 }
590
591done:
592 /* Apply any errata. */
593 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
594 *bridge_agpstat &= ~AGPSTAT_FW;
595
596 if (agp_bridge->flags & AGP_ERRATA_SBA)
597 *bridge_agpstat &= ~AGPSTAT_SBA;
598
599 if (agp_bridge->flags & AGP_ERRATA_1X) {
600 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
601 *bridge_agpstat |= AGPSTAT2_1X;
602 }
603}
604
605
606/**
607 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
608 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
609 * @requested_mode: requested agp_stat from userspace (Typically from X)
610 * @bridge_agpstat: current agp_stat from AGP bridge.
611 *
612 * This function will hunt for an AGP graphics card, and try to match
613 * the requested mode to the capabilities of both the bridge and the card.
614 */
615u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
616{
617 struct pci_dev *device = NULL;
618 u32 vga_agpstat;
619 u8 cap_ptr;
620
621 for (;;) {
622 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
623 if (!device) {
Dave Jones8c8b8382005-08-17 23:08:11 -0700624 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return 0;
626 }
627 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
628 if (cap_ptr)
629 break;
630 }
631
632 /*
633 * Ok, here we have a AGP device. Disable impossible
634 * settings, and adjust the readqueue to the minimum.
635 */
636 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
637
638 /* adjust RQ depth */
639 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
640 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
641 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
642
643 /* disable FW if it's not supported */
644 if (!((bridge_agpstat & AGPSTAT_FW) &&
645 (vga_agpstat & AGPSTAT_FW) &&
646 (requested_mode & AGPSTAT_FW)))
647 bridge_agpstat &= ~AGPSTAT_FW;
648
649 /* Check to see if we are operating in 3.0 mode */
David Mosberger66bb8bf2005-04-04 13:29:43 -0700650 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
652 else
653 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
654
655 pci_dev_put(device);
656 return bridge_agpstat;
657}
658EXPORT_SYMBOL(agp_collect_device_status);
659
660
661void agp_device_command(u32 bridge_agpstat, int agp_v3)
662{
663 struct pci_dev *device = NULL;
664 int mode;
665
666 mode = bridge_agpstat & 0x7;
667 if (agp_v3)
668 mode *= 4;
669
670 for_each_pci_dev(device) {
671 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
672 if (!agp)
673 continue;
674
675 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
676 agp_v3 ? 3 : 2, pci_name(device), mode);
677 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
678 }
679}
680EXPORT_SYMBOL(agp_device_command);
681
682
683void get_agp_version(struct agp_bridge_data *bridge)
684{
685 u32 ncapid;
686
687 /* Exit early if already set by errata workarounds. */
688 if (bridge->major_version != 0)
689 return;
690
691 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
692 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
693 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
694}
695EXPORT_SYMBOL(get_agp_version);
696
697
698void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
699{
700 u32 bridge_agpstat, temp;
701
702 get_agp_version(agp_bridge);
703
704 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
705 agp_bridge->major_version,
706 agp_bridge->minor_version,
707 pci_name(agp_bridge->dev));
708
709 pci_read_config_dword(agp_bridge->dev,
710 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
711
712 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
713 if (bridge_agpstat == 0)
714 /* Something bad happened. FIXME: Return error code? */
715 return;
716
717 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
718
719 /* Do AGP version specific frobbing. */
720 if (bridge->major_version >= 3) {
David Mosberger66bb8bf2005-04-04 13:29:43 -0700721 if (bridge->mode & AGPSTAT_MODE_3_0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 /* If we have 3.5, we can do the isoch stuff. */
723 if (bridge->minor_version >= 5)
724 agp_3_5_enable(bridge);
725 agp_device_command(bridge_agpstat, TRUE);
726 return;
727 } else {
728 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
729 bridge_agpstat &= ~(7<<10) ;
730 pci_read_config_dword(bridge->dev,
731 bridge->capndx+AGPCTRL, &temp);
732 temp |= (1<<9);
733 pci_write_config_dword(bridge->dev,
734 bridge->capndx+AGPCTRL, temp);
735
Dave Jones8c8b8382005-08-17 23:08:11 -0700736 printk(KERN_INFO PFX "Device is in legacy mode,"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 " falling back to 2.x\n");
738 }
739 }
740
741 /* AGP v<3 */
742 agp_device_command(bridge_agpstat, FALSE);
743}
744EXPORT_SYMBOL(agp_generic_enable);
745
746
747int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
748{
749 char *table;
750 char *table_end;
751 int size;
752 int page_order;
753 int num_entries;
754 int i;
755 void *temp;
756 struct page *page;
757
758 /* The generic routines can't handle 2 level gatt's */
759 if (bridge->driver->size_type == LVL2_APER_SIZE)
760 return -EINVAL;
761
762 table = NULL;
763 i = bridge->aperture_size_idx;
764 temp = bridge->current_size;
765 size = page_order = num_entries = 0;
766
767 if (bridge->driver->size_type != FIXED_APER_SIZE) {
768 do {
769 switch (bridge->driver->size_type) {
770 case U8_APER_SIZE:
771 size = A_SIZE_8(temp)->size;
772 page_order =
773 A_SIZE_8(temp)->page_order;
774 num_entries =
775 A_SIZE_8(temp)->num_entries;
776 break;
777 case U16_APER_SIZE:
778 size = A_SIZE_16(temp)->size;
779 page_order = A_SIZE_16(temp)->page_order;
780 num_entries = A_SIZE_16(temp)->num_entries;
781 break;
782 case U32_APER_SIZE:
783 size = A_SIZE_32(temp)->size;
784 page_order = A_SIZE_32(temp)->page_order;
785 num_entries = A_SIZE_32(temp)->num_entries;
786 break;
787 /* This case will never really happen. */
788 case FIXED_APER_SIZE:
789 case LVL2_APER_SIZE:
790 default:
791 size = page_order = num_entries = 0;
792 break;
793 }
794
Keir Fraser07eee782005-03-30 13:17:04 -0800795 table = alloc_gatt_pages(page_order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797 if (table == NULL) {
798 i++;
799 switch (bridge->driver->size_type) {
800 case U8_APER_SIZE:
801 bridge->current_size = A_IDX8(bridge);
802 break;
803 case U16_APER_SIZE:
804 bridge->current_size = A_IDX16(bridge);
805 break;
806 case U32_APER_SIZE:
807 bridge->current_size = A_IDX32(bridge);
808 break;
809 /* This case will never really happen. */
810 case FIXED_APER_SIZE:
811 case LVL2_APER_SIZE:
812 default:
813 bridge->current_size =
814 bridge->current_size;
815 break;
816 }
817 temp = bridge->current_size;
818 } else {
819 bridge->aperture_size_idx = i;
820 }
821 } while (!table && (i < bridge->driver->num_aperture_sizes));
822 } else {
823 size = ((struct aper_size_info_fixed *) temp)->size;
824 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
825 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
Keir Fraser07eee782005-03-30 13:17:04 -0800826 table = alloc_gatt_pages(page_order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
828
829 if (table == NULL)
830 return -ENOMEM;
831
832 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
833
834 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
835 SetPageReserved(page);
836
837 bridge->gatt_table_real = (u32 *) table;
838 agp_gatt_table = (void *)table;
839
840 bridge->driver->cache_flush();
Keir Fraser07eee782005-03-30 13:17:04 -0800841 bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 (PAGE_SIZE * (1 << page_order)));
843 bridge->driver->cache_flush();
844
845 if (bridge->gatt_table == NULL) {
846 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
847 ClearPageReserved(page);
848
Keir Fraser07eee782005-03-30 13:17:04 -0800849 free_gatt_pages(table, page_order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 return -ENOMEM;
852 }
Keir Fraser07eee782005-03-30 13:17:04 -0800853 bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855 /* AK: bogus, should encode addresses > 4GB */
856 for (i = 0; i < num_entries; i++) {
857 writel(bridge->scratch_page, bridge->gatt_table+i);
858 readl(bridge->gatt_table+i); /* PCI Posting. */
859 }
860
861 return 0;
862}
863EXPORT_SYMBOL(agp_generic_create_gatt_table);
864
865int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
866{
867 int page_order;
868 char *table, *table_end;
869 void *temp;
870 struct page *page;
871
872 temp = bridge->current_size;
873
874 switch (bridge->driver->size_type) {
875 case U8_APER_SIZE:
876 page_order = A_SIZE_8(temp)->page_order;
877 break;
878 case U16_APER_SIZE:
879 page_order = A_SIZE_16(temp)->page_order;
880 break;
881 case U32_APER_SIZE:
882 page_order = A_SIZE_32(temp)->page_order;
883 break;
884 case FIXED_APER_SIZE:
885 page_order = A_SIZE_FIX(temp)->page_order;
886 break;
887 case LVL2_APER_SIZE:
888 /* The generic routines can't deal with 2 level gatt's */
889 return -EINVAL;
890 break;
891 default:
892 page_order = 0;
893 break;
894 }
895
896 /* Do not worry about freeing memory, because if this is
897 * called, then all agp memory is deallocated and removed
898 * from the table. */
899
900 iounmap(bridge->gatt_table);
901 table = (char *) bridge->gatt_table_real;
902 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
903
904 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
905 ClearPageReserved(page);
906
Keir Fraser07eee782005-03-30 13:17:04 -0800907 free_gatt_pages(bridge->gatt_table_real, page_order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908
909 agp_gatt_table = NULL;
910 bridge->gatt_table = NULL;
911 bridge->gatt_table_real = NULL;
912 bridge->gatt_bus_addr = 0;
913
914 return 0;
915}
916EXPORT_SYMBOL(agp_generic_free_gatt_table);
917
918
919int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
920{
921 int num_entries;
922 size_t i;
923 off_t j;
924 void *temp;
925 struct agp_bridge_data *bridge;
926
927 bridge = mem->bridge;
928 if (!bridge)
929 return -EINVAL;
930
931 temp = bridge->current_size;
932
933 switch (bridge->driver->size_type) {
934 case U8_APER_SIZE:
935 num_entries = A_SIZE_8(temp)->num_entries;
936 break;
937 case U16_APER_SIZE:
938 num_entries = A_SIZE_16(temp)->num_entries;
939 break;
940 case U32_APER_SIZE:
941 num_entries = A_SIZE_32(temp)->num_entries;
942 break;
943 case FIXED_APER_SIZE:
944 num_entries = A_SIZE_FIX(temp)->num_entries;
945 break;
946 case LVL2_APER_SIZE:
947 /* The generic routines can't deal with 2 level gatt's */
948 return -EINVAL;
949 break;
950 default:
951 num_entries = 0;
952 break;
953 }
954
955 num_entries -= agp_memory_reserved/PAGE_SIZE;
956 if (num_entries < 0) num_entries = 0;
957
958 if (type != 0 || mem->type != 0) {
959 /* The generic routines know nothing of memory types */
960 return -EINVAL;
961 }
962
963 /* AK: could wrap */
964 if ((pg_start + mem->page_count) > num_entries)
965 return -EINVAL;
966
967 j = pg_start;
968
969 while (j < (pg_start + mem->page_count)) {
970 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
971 return -EBUSY;
972 j++;
973 }
974
975 if (mem->is_flushed == FALSE) {
976 bridge->driver->cache_flush();
977 mem->is_flushed = TRUE;
978 }
979
980 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
981 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
982 readl(bridge->gatt_table+j); /* PCI Posting. */
983 }
984
985 bridge->driver->tlb_flush(mem);
986 return 0;
987}
988EXPORT_SYMBOL(agp_generic_insert_memory);
989
990
991int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
992{
993 size_t i;
994 struct agp_bridge_data *bridge;
995
996 bridge = mem->bridge;
997 if (!bridge)
998 return -EINVAL;
999
1000 if (type != 0 || mem->type != 0) {
1001 /* The generic routines know nothing of memory types */
1002 return -EINVAL;
1003 }
1004
1005 /* AK: bogus, should encode addresses > 4GB */
1006 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1007 writel(bridge->scratch_page, bridge->gatt_table+i);
1008 readl(bridge->gatt_table+i); /* PCI Posting. */
1009 }
1010
1011 global_cache_flush();
1012 bridge->driver->tlb_flush(mem);
1013 return 0;
1014}
1015EXPORT_SYMBOL(agp_generic_remove_memory);
1016
1017
1018struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1019{
1020 return NULL;
1021}
1022EXPORT_SYMBOL(agp_generic_alloc_by_type);
1023
1024
1025void agp_generic_free_by_type(struct agp_memory *curr)
1026{
1027 vfree(curr->memory);
1028 agp_free_key(curr->key);
1029 kfree(curr);
1030}
1031EXPORT_SYMBOL(agp_generic_free_by_type);
1032
1033
1034/*
1035 * Basic Page Allocation Routines -
1036 * These routines handle page allocation and by default they reserve the allocated
1037 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1038 * against a maximum value.
1039 */
1040
1041void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1042{
1043 struct page * page;
1044
1045 page = alloc_page(GFP_KERNEL);
1046 if (page == NULL)
1047 return NULL;
1048
1049 map_page_into_agp(page);
1050
1051 get_page(page);
1052 SetPageLocked(page);
1053 atomic_inc(&agp_bridge->current_memory_agp);
1054 return page_address(page);
1055}
1056EXPORT_SYMBOL(agp_generic_alloc_page);
1057
1058
1059void agp_generic_destroy_page(void *addr)
1060{
1061 struct page *page;
1062
1063 if (addr == NULL)
1064 return;
1065
1066 page = virt_to_page(addr);
1067 unmap_page_from_agp(page);
1068 put_page(page);
1069 unlock_page(page);
1070 free_page((unsigned long)addr);
1071 atomic_dec(&agp_bridge->current_memory_agp);
1072}
1073EXPORT_SYMBOL(agp_generic_destroy_page);
1074
1075/* End Basic Page Allocation Routines */
1076
1077
1078/**
1079 * agp_enable - initialise the agp point-to-point connection.
1080 *
1081 * @mode: agp mode register value to configure with.
1082 */
1083void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1084{
1085 if (!bridge)
1086 return;
1087 bridge->driver->agp_enable(bridge, mode);
1088}
1089EXPORT_SYMBOL(agp_enable);
1090
1091/* When we remove the global variable agp_bridge from all drivers
1092 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1093 */
1094
1095struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1096{
1097 if (list_empty(&agp_bridges))
1098 return NULL;
1099
1100 return agp_bridge;
1101}
1102
1103static void ipi_handler(void *null)
1104{
1105 flush_agp_cache();
1106}
1107
1108void global_cache_flush(void)
1109{
1110 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1111 panic(PFX "timed out waiting for the other CPUs!\n");
1112}
1113EXPORT_SYMBOL(global_cache_flush);
1114
1115unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1116 unsigned long addr, int type)
1117{
1118 /* memory type is ignored in the generic routine */
1119 if (bridge->driver->masks)
1120 return addr | bridge->driver->masks[0].mask;
1121 else
1122 return addr;
1123}
1124EXPORT_SYMBOL(agp_generic_mask_memory);
1125
1126/*
1127 * These functions are implemented according to the AGPv3 spec,
1128 * which covers implementation details that had previously been
1129 * left open.
1130 */
1131
1132int agp3_generic_fetch_size(void)
1133{
1134 u16 temp_size;
1135 int i;
1136 struct aper_size_info_16 *values;
1137
1138 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1139 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1140
1141 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1142 if (temp_size == values[i].size_value) {
1143 agp_bridge->previous_size =
1144 agp_bridge->current_size = (void *) (values + i);
1145
1146 agp_bridge->aperture_size_idx = i;
1147 return values[i].size;
1148 }
1149 }
1150 return 0;
1151}
1152EXPORT_SYMBOL(agp3_generic_fetch_size);
1153
1154void agp3_generic_tlbflush(struct agp_memory *mem)
1155{
1156 u32 ctrl;
1157 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1158 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1159 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1160}
1161EXPORT_SYMBOL(agp3_generic_tlbflush);
1162
1163int agp3_generic_configure(void)
1164{
1165 u32 temp;
1166 struct aper_size_info_16 *current_size;
1167
1168 current_size = A_SIZE_16(agp_bridge->current_size);
1169
1170 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1171 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1172
1173 /* set aperture size */
1174 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1175 /* set gart pointer */
1176 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1177 /* enable aperture and GTLB */
1178 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1179 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1180 return 0;
1181}
1182EXPORT_SYMBOL(agp3_generic_configure);
1183
1184void agp3_generic_cleanup(void)
1185{
1186 u32 ctrl;
1187 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1188 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1189}
1190EXPORT_SYMBOL(agp3_generic_cleanup);
1191
1192struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1193{
1194 {4096, 1048576, 10,0x000},
1195 {2048, 524288, 9, 0x800},
1196 {1024, 262144, 8, 0xc00},
1197 { 512, 131072, 7, 0xe00},
1198 { 256, 65536, 6, 0xf00},
1199 { 128, 32768, 5, 0xf20},
1200 { 64, 16384, 4, 0xf30},
1201 { 32, 8192, 3, 0xf38},
1202 { 16, 4096, 2, 0xf3c},
1203 { 8, 2048, 1, 0xf3e},
1204 { 4, 1024, 0, 0xf3f}
1205};
1206EXPORT_SYMBOL(agp3_generic_sizes);
1207