drivers/char/agp/generic.c

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