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 <linux/sched.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;
  47 int 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  */
  53 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  54
  55 /*
  56  * Generic routines for handling agp_memory structures -
  57  * They use the basic page allocation routines to do the brunt of the work.
  58  */
  59
  60 void agp_free_key(int key)
  61 {
  62         if (key < 0)
  63                 return;
  64
  65         if (key < MAXKEY)
  66                 clear_bit(key, agp_bridge->key_list);
  67 }
  68 EXPORT_SYMBOL(agp_free_key);
  69
  70
  71 static int agp_get_key(void)
  72 {
  73         int bit;
  74
  75         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  76         if (bit < MAXKEY) {
  77                 set_bit(bit, agp_bridge->key_list);
  78                 return bit;
  79         }
  80         return -1;
  81 }
  82
  83 /*
  84  * Use kmalloc if possible for the page list. Otherwise fall back to
  85  * vmalloc. This speeds things up and also saves memory for small AGP
  86  * regions.
  87  */
  88
  89 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
  90 {
  91         mem->memory = NULL;
  92         mem->vmalloc_flag = 0;
  93
  94         if (size <= 2*PAGE_SIZE)
  95                 mem->memory = kmalloc(size, GFP_KERNEL | __GFP_NORETRY);
  96         if (mem->memory == NULL) {
  97                 mem->memory = vmalloc(size);
  98                 mem->vmalloc_flag = 1;
  99         }
 100 }
 101 EXPORT_SYMBOL(agp_alloc_page_array);
 102
 103 void agp_free_page_array(struct agp_memory *mem)
 104 {
 105         if (mem->vmalloc_flag) {
 106                 vfree(mem->memory);
 107         } else {
 108                 kfree(mem->memory);
 109         }
 110 }
 111 EXPORT_SYMBOL(agp_free_page_array);
 112
 113
 114 static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
 115 {
 116         struct agp_memory *new;
 117         unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
 118
 119         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 120         if (new == NULL)
 121                 return NULL;
 122
 123         new->key = agp_get_key();
 124
 125         if (new->key < 0) {
 126                 kfree(new);
 127                 return NULL;
 128         }
 129
 130         agp_alloc_page_array(alloc_size, new);
 131
 132         if (new->memory == NULL) {
 133                 agp_free_key(new->key);
 134                 kfree(new);
 135                 return NULL;
 136         }
 137         new->num_scratch_pages = 0;
 138         return new;
 139 }
 140
 141 struct agp_memory *agp_create_memory(int scratch_pages)
 142 {
 143         struct agp_memory *new;
 144
 145         new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
 146         if (new == NULL)
 147                 return NULL;
 148
 149         new->key = agp_get_key();
 150
 151         if (new->key < 0) {
 152                 kfree(new);
 153                 return NULL;
 154         }
 155
 156         agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
 157
 158         if (new->memory == NULL) {
 159                 agp_free_key(new->key);
 160                 kfree(new);
 161                 return NULL;
 162         }
 163         new->num_scratch_pages = scratch_pages;
 164         new->type = AGP_NORMAL_MEMORY;
 165         return new;
 166 }
 167 EXPORT_SYMBOL(agp_create_memory);
 168
 169 /**
 170  *      agp_free_memory - free memory associated with an agp_memory pointer.
 171  *
 172  *      @curr:          agp_memory pointer to be freed.
 173  *
 174  *      It is the only function that can be called when the backend is not owned
 175  *      by the caller.  (So it can free memory on client death.)
 176  */
 177 void agp_free_memory(struct agp_memory *curr)
 178 {
 179         size_t i;
 180
 181         if (curr == NULL)
 182                 return;
 183
 184         if (curr->is_bound == TRUE)
 185                 agp_unbind_memory(curr);
 186
 187         if (curr->type >= AGP_USER_TYPES) {
 188                 agp_generic_free_by_type(curr);
 189                 return;
 190         }
 191
 192         if (curr->type != 0) {
 193                 curr->bridge->driver->free_by_type(curr);
 194                 return;
 195         }
 196         if (curr->page_count != 0) {
 197                 for (i = 0; i < curr->page_count; i++) {
 198                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]), AGP_PAGE_DESTROY_UNMAP);
 199                 }
 200                 flush_agp_mappings();
 201                 for (i = 0; i < curr->page_count; i++) {
 202                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]), AGP_PAGE_DESTROY_FREE);
 203                 }
 204         }
 205         agp_free_key(curr->key);
 206         agp_free_page_array(curr);
 207         kfree(curr);
 208 }
 209 EXPORT_SYMBOL(agp_free_memory);
 210
 211 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 212
 213 /**
 214  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 215  *
 216  *      @page_count:    size_t argument of the number of pages
 217  *      @type:  u32 argument of the type of memory to be allocated.
 218  *
 219  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 220  *      maps to physical ram.  Any other type is device dependent.
 221  *
 222  *      It returns NULL whenever memory is unavailable.
 223  */
 224 struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
 225                                         size_t page_count, u32 type)
 226 {
 227         int scratch_pages;
 228         struct agp_memory *new;
 229         size_t i;
 230
 231         if (!bridge)
 232                 return NULL;
 233
 234         if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
 235                 return NULL;
 236
 237         if (type >= AGP_USER_TYPES) {
 238                 new = agp_generic_alloc_user(page_count, type);
 239                 if (new)
 240                         new->bridge = bridge;
 241                 return new;
 242         }
 243
 244         if (type != 0) {
 245                 new = bridge->driver->alloc_by_type(page_count, type);
 246                 if (new)
 247                         new->bridge = bridge;
 248                 return new;
 249         }
 250
 251         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 252
 253         new = agp_create_memory(scratch_pages);
 254
 255         if (new == NULL)
 256                 return NULL;
 257
 258         for (i = 0; i < page_count; i++) {
 259                 void *addr = bridge->driver->agp_alloc_page(bridge);
 260
 261                 if (addr == NULL) {
 262                         agp_free_memory(new);
 263                         return NULL;
 264                 }
 265                 new->memory[i] = virt_to_gart(addr);
 266                 new->page_count++;
 267         }
 268         new->bridge = bridge;
 269
 270         flush_agp_mappings();
 271
 272         return new;
 273 }
 274 EXPORT_SYMBOL(agp_allocate_memory);
 275
 276
 277 /* End - Generic routines for handling agp_memory structures */
 278
 279
 280 static int agp_return_size(void)
 281 {
 282         int current_size;
 283         void *temp;
 284
 285         temp = agp_bridge->current_size;
 286
 287         switch (agp_bridge->driver->size_type) {
 288         case U8_APER_SIZE:
 289                 current_size = A_SIZE_8(temp)->size;
 290                 break;
 291         case U16_APER_SIZE:
 292                 current_size = A_SIZE_16(temp)->size;
 293                 break;
 294         case U32_APER_SIZE:
 295                 current_size = A_SIZE_32(temp)->size;
 296                 break;
 297         case LVL2_APER_SIZE:
 298                 current_size = A_SIZE_LVL2(temp)->size;
 299                 break;
 300         case FIXED_APER_SIZE:
 301                 current_size = A_SIZE_FIX(temp)->size;
 302                 break;
 303         default:
 304                 current_size = 0;
 305                 break;
 306         }
 307
 308         current_size -= (agp_memory_reserved / (1024*1024));
 309         if (current_size <0)
 310                 current_size = 0;
 311         return current_size;
 312 }
 313
 314
 315 int agp_num_entries(void)
 316 {
 317         int num_entries;
 318         void *temp;
 319
 320         temp = agp_bridge->current_size;
 321
 322         switch (agp_bridge->driver->size_type) {
 323         case U8_APER_SIZE:
 324                 num_entries = A_SIZE_8(temp)->num_entries;
 325                 break;
 326         case U16_APER_SIZE:
 327                 num_entries = A_SIZE_16(temp)->num_entries;
 328                 break;
 329         case U32_APER_SIZE:
 330                 num_entries = A_SIZE_32(temp)->num_entries;
 331                 break;
 332         case LVL2_APER_SIZE:
 333                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 334                 break;
 335         case FIXED_APER_SIZE:
 336                 num_entries = A_SIZE_FIX(temp)->num_entries;
 337                 break;
 338         default:
 339                 num_entries = 0;
 340                 break;
 341         }
 342
 343         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 344         if (num_entries<0)
 345                 num_entries = 0;
 346         return num_entries;
 347 }
 348 EXPORT_SYMBOL_GPL(agp_num_entries);
 349
 350
 351 /**
 352  *      agp_copy_info  -  copy bridge state information
 353  *
 354  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 355  *
 356  *      This function copies information about the agp bridge device and the state of
 357  *      the agp backend into an agp_kern_info pointer.
 358  */
 359 int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
 360 {
 361         memset(info, 0, sizeof(struct agp_kern_info));
 362         if (!bridge) {
 363                 info->chipset = NOT_SUPPORTED;
 364                 return -EIO;
 365         }
 366
 367         info->version.major = bridge->version->major;
 368         info->version.minor = bridge->version->minor;
 369         info->chipset = SUPPORTED;
 370         info->device = bridge->dev;
 371         if (bridge->mode & AGPSTAT_MODE_3_0)
 372                 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
 373         else
 374                 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
 375         info->aper_base = bridge->gart_bus_addr;
 376         info->aper_size = agp_return_size();
 377         info->max_memory = bridge->max_memory_agp;
 378         info->current_memory = atomic_read(&bridge->current_memory_agp);
 379         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 380         info->vm_ops = bridge->vm_ops;
 381         info->page_mask = ~0UL;
 382         return 0;
 383 }
 384 EXPORT_SYMBOL(agp_copy_info);
 385
 386 /* End - Routine to copy over information structure */
 387
 388 /*
 389  * Routines for handling swapping of agp_memory into the GATT -
 390  * These routines take agp_memory and insert them into the GATT.
 391  * They call device specific routines to actually write to the GATT.
 392  */
 393
 394 /**
 395  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 396  *
 397  *      @curr:          agp_memory pointer
 398  *      @pg_start:      an offset into the graphics aperture translation table
 399  *
 400  *      It returns -EINVAL if the pointer == NULL.
 401  *      It returns -EBUSY if the area of the table requested is already in use.
 402  */
 403 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 404 {
 405         int ret_val;
 406
 407         if (curr == NULL)
 408                 return -EINVAL;
 409
 410         if (curr->is_bound == TRUE) {
 411                 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
 412                 return -EINVAL;
 413         }
 414         if (curr->is_flushed == FALSE) {
 415                 curr->bridge->driver->cache_flush();
 416                 curr->is_flushed = TRUE;
 417         }
 418         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 419
 420         if (ret_val != 0)
 421                 return ret_val;
 422
 423         curr->is_bound = TRUE;
 424         curr->pg_start = pg_start;
 425         return 0;
 426 }
 427 EXPORT_SYMBOL(agp_bind_memory);
 428
 429
 430 /**
 431  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 432  *
 433  * @curr:       agp_memory pointer to be removed from the GATT.
 434  *
 435  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 436  * the graphics aperture translation table or if the agp_memory pointer == NULL
 437  */
 438 int agp_unbind_memory(struct agp_memory *curr)
 439 {
 440         int ret_val;
 441
 442         if (curr == NULL)
 443                 return -EINVAL;
 444
 445         if (curr->is_bound != TRUE) {
 446                 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
 447                 return -EINVAL;
 448         }
 449
 450         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 451
 452         if (ret_val != 0)
 453                 return ret_val;
 454
 455         curr->is_bound = FALSE;
 456         curr->pg_start = 0;
 457         return 0;
 458 }
 459 EXPORT_SYMBOL(agp_unbind_memory);
 460
 461 /* End - Routines for handling swapping of agp_memory into the GATT */
 462
 463
 464 /* Generic Agp routines - Start */
 465 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 466 {
 467         u32 tmp;
 468
 469         if (*requested_mode & AGP2_RESERVED_MASK) {
 470                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 471                         *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
 472                 *requested_mode &= ~AGP2_RESERVED_MASK;
 473         }
 474
 475         /*
 476          * Some dumb bridges are programmed to disobey the AGP2 spec.
 477          * This is likely a BIOS misprogramming rather than poweron default, or
 478          * it would be a lot more common.
 479          * https://bugs.freedesktop.org/show_bug.cgi?id=8816
 480          * AGPv2 spec 6.1.9 states:
 481          *   The RATE field indicates the data transfer rates supported by this
 482          *   device. A.G.P. devices must report all that apply.
 483          * Fix them up as best we can.
 484          */
 485         switch (*bridge_agpstat & 7) {
 486         case 4:
 487                 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
 488                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate"
 489                         "Fixing up support for x2 & x1\n");
 490                 break;
 491         case 2:
 492                 *bridge_agpstat |= AGPSTAT2_1X;
 493                 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate"
 494                         "Fixing up support for x1\n");
 495                 break;
 496         default:
 497                 break;
 498         }
 499
 500         /* Check the speed bits make sense. Only one should be set. */
 501         tmp = *requested_mode & 7;
 502         switch (tmp) {
 503                 case 0:
 504                         printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 505                         *requested_mode |= AGPSTAT2_1X;
 506                         break;
 507                 case 1:
 508                 case 2:
 509                         break;
 510                 case 3:
 511                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 512                         break;
 513                 case 4:
 514                         break;
 515                 case 5:
 516                 case 6:
 517                 case 7:
 518                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 519                         break;
 520         }
 521
 522         /* disable SBA if it's not supported */
 523         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 524                 *bridge_agpstat &= ~AGPSTAT_SBA;
 525
 526         /* Set rate */
 527         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 528                 *bridge_agpstat &= ~AGPSTAT2_4X;
 529
 530         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 531                 *bridge_agpstat &= ~AGPSTAT2_2X;
 532
 533         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 534                 *bridge_agpstat &= ~AGPSTAT2_1X;
 535
 536         /* Now we know what mode it should be, clear out the unwanted bits. */
 537         if (*bridge_agpstat & AGPSTAT2_4X)
 538                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 539
 540         if (*bridge_agpstat & AGPSTAT2_2X)
 541                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 542
 543         if (*bridge_agpstat & AGPSTAT2_1X)
 544                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 545
 546         /* Apply any errata. */
 547         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 548                 *bridge_agpstat &= ~AGPSTAT_FW;
 549
 550         if (agp_bridge->flags & AGP_ERRATA_SBA)
 551                 *bridge_agpstat &= ~AGPSTAT_SBA;
 552
 553         if (agp_bridge->flags & AGP_ERRATA_1X) {
 554                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 555                 *bridge_agpstat |= AGPSTAT2_1X;
 556         }
 557
 558         /* If we've dropped down to 1X, disable fast writes. */
 559         if (*bridge_agpstat & AGPSTAT2_1X)
 560                 *bridge_agpstat &= ~AGPSTAT_FW;
 561 }
 562
 563 /*
 564  * requested_mode = Mode requested by (typically) X.
 565  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 566  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 567  */
 568 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 569 {
 570         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 571         u32 tmp;
 572
 573         if (*requested_mode & AGP3_RESERVED_MASK) {
 574                 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
 575                         *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
 576                 *requested_mode &= ~AGP3_RESERVED_MASK;
 577         }
 578
 579         /* Check the speed bits make sense. */
 580         tmp = *requested_mode & 7;
 581         if (tmp == 0) {
 582                 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 583                 *requested_mode |= AGPSTAT3_4X;
 584         }
 585         if (tmp >= 3) {
 586                 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 587                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 588         }
 589
 590         /* ARQSZ - Set the value to the maximum one.
 591          * Don't allow the mode register to override values. */
 592         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 593                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 594
 595         /* Calibration cycle.
 596          * Don't allow the mode register to override values. */
 597         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 598                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 599
 600         /* SBA *must* be supported for AGP v3 */
 601         *bridge_agpstat |= AGPSTAT_SBA;
 602
 603         /*
 604          * Set speed.
 605          * Check for invalid speeds. This can happen when applications
 606          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 607          */
 608         if (*requested_mode & AGPSTAT_MODE_3_0) {
 609                 /*
 610                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 611                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 612                  * AGP2.x 4x -> AGP3.0 4x.
 613                  */
 614                 if (*requested_mode & AGPSTAT2_4X) {
 615                         printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 616                                                 current->comm, *requested_mode);
 617                         *requested_mode &= ~AGPSTAT2_4X;
 618                         *requested_mode |= AGPSTAT3_4X;
 619                 }
 620         } else {
 621                 /*
 622                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 623                  * but have been passed an AGP 2.x mode.
 624                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 625                  */
 626                 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 627                                         current->comm, *requested_mode);
 628                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 629                 *requested_mode |= AGPSTAT3_4X;
 630         }
 631
 632         if (*requested_mode & AGPSTAT3_8X) {
 633                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 634                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 635                         *bridge_agpstat |= AGPSTAT3_4X;
 636                         printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
 637                         return;
 638                 }
 639                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 640                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 641                         *bridge_agpstat |= AGPSTAT3_4X;
 642                         printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
 643                         return;
 644                 }
 645                 /* All set, bridge & device can do AGP x8*/
 646                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 647                 goto done;
 648
 649         } else if (*requested_mode & AGPSTAT3_4X) {
 650                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 651                 *bridge_agpstat |= AGPSTAT3_4X;
 652                 goto done;
 653
 654         } else {
 655
 656                 /*
 657                  * If we didn't specify an AGP mode, we see if both
 658                  * the graphics card, and the bridge can do x8, and use if so.
 659                  * If not, we fall back to x4 mode.
 660                  */
 661                 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
 662                         printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
 663                                 "supported by bridge & card (x8).\n");
 664                         *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 665                         *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 666                 } else {
 667                         printk(KERN_INFO PFX "Fell back to AGPx4 mode because");
 668                         if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 669                                 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
 670                                         *bridge_agpstat, origbridge);
 671                                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 672                                 *bridge_agpstat |= AGPSTAT3_4X;
 673                         }
 674                         if (!(*vga_agpstat & AGPSTAT3_8X)) {
 675                                 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
 676                                         *vga_agpstat, origvga);
 677                                 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 678                                 *vga_agpstat |= AGPSTAT3_4X;
 679                         }
 680                 }
 681         }
 682
 683 done:
 684         /* Apply any errata. */
 685         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 686                 *bridge_agpstat &= ~AGPSTAT_FW;
 687
 688         if (agp_bridge->flags & AGP_ERRATA_SBA)
 689                 *bridge_agpstat &= ~AGPSTAT_SBA;
 690
 691         if (agp_bridge->flags & AGP_ERRATA_1X) {
 692                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 693                 *bridge_agpstat |= AGPSTAT2_1X;
 694         }
 695 }
 696
 697
 698 /**
 699  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 700  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 701  * @requested_mode: requested agp_stat from userspace (Typically from X)
 702  * @bridge_agpstat: current agp_stat from AGP bridge.
 703  *
 704  * This function will hunt for an AGP graphics card, and try to match
 705  * the requested mode to the capabilities of both the bridge and the card.
 706  */
 707 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 708 {
 709         struct pci_dev *device = NULL;
 710         u32 vga_agpstat;
 711         u8 cap_ptr;
 712
 713         for (;;) {
 714                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 715                 if (!device) {
 716                         printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 717                         return 0;
 718                 }
 719                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 720                 if (cap_ptr)
 721                         break;
 722         }
 723
 724         /*
 725          * Ok, here we have a AGP device. Disable impossible
 726          * settings, and adjust the readqueue to the minimum.
 727          */
 728         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 729
 730         /* adjust RQ depth */
 731         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 732              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 733                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 734
 735         /* disable FW if it's not supported */
 736         if (!((bridge_agpstat & AGPSTAT_FW) &&
 737                  (vga_agpstat & AGPSTAT_FW) &&
 738                  (requested_mode & AGPSTAT_FW)))
 739                 bridge_agpstat &= ~AGPSTAT_FW;
 740
 741         /* Check to see if we are operating in 3.0 mode */
 742         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 743                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 744         else
 745                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 746
 747         pci_dev_put(device);
 748         return bridge_agpstat;
 749 }
 750 EXPORT_SYMBOL(agp_collect_device_status);
 751
 752
 753 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 754 {
 755         struct pci_dev *device = NULL;
 756         int mode;
 757
 758         mode = bridge_agpstat & 0x7;
 759         if (agp_v3)
 760                 mode *= 4;
 761
 762         for_each_pci_dev(device) {
 763                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 764                 if (!agp)
 765                         continue;
 766
 767                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 768                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 769                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 770         }
 771 }
 772 EXPORT_SYMBOL(agp_device_command);
 773
 774
 775 void get_agp_version(struct agp_bridge_data *bridge)
 776 {
 777         u32 ncapid;
 778
 779         /* Exit early if already set by errata workarounds. */
 780         if (bridge->major_version != 0)
 781                 return;
 782
 783         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 784         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 785         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 786 }
 787 EXPORT_SYMBOL(get_agp_version);
 788
 789
 790 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 791 {
 792         u32 bridge_agpstat, temp;
 793
 794         get_agp_version(agp_bridge);
 795
 796         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 797                                 agp_bridge->major_version,
 798                                 agp_bridge->minor_version,
 799                                 pci_name(agp_bridge->dev));
 800
 801         pci_read_config_dword(agp_bridge->dev,
 802                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 803
 804         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 805         if (bridge_agpstat == 0)
 806                 /* Something bad happened. FIXME: Return error code? */
 807                 return;
 808
 809         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 810
 811         /* Do AGP version specific frobbing. */
 812         if (bridge->major_version >= 3) {
 813                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 814                         /* If we have 3.5, we can do the isoch stuff. */
 815                         if (bridge->minor_version >= 5)
 816                                 agp_3_5_enable(bridge);
 817                         agp_device_command(bridge_agpstat, TRUE);
 818                         return;
 819                 } else {
 820                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 821                     bridge_agpstat &= ~(7<<10) ;
 822                     pci_read_config_dword(bridge->dev,
 823                                         bridge->capndx+AGPCTRL, &temp);
 824                     temp |= (1<<9);
 825                     pci_write_config_dword(bridge->dev,
 826                                         bridge->capndx+AGPCTRL, temp);
 827
 828                     printk(KERN_INFO PFX "Device is in legacy mode,"
 829                                 " falling back to 2.x\n");
 830                 }
 831         }
 832
 833         /* AGP v<3 */
 834         agp_device_command(bridge_agpstat, FALSE);
 835 }
 836 EXPORT_SYMBOL(agp_generic_enable);
 837
 838
 839 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 840 {
 841         char *table;
 842         char *table_end;
 843         int size;
 844         int page_order;
 845         int num_entries;
 846         int i;
 847         void *temp;
 848         struct page *page;
 849
 850         /* The generic routines can't handle 2 level gatt's */
 851         if (bridge->driver->size_type == LVL2_APER_SIZE)
 852                 return -EINVAL;
 853
 854         table = NULL;
 855         i = bridge->aperture_size_idx;
 856         temp = bridge->current_size;
 857         size = page_order = num_entries = 0;
 858
 859         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 860                 do {
 861                         switch (bridge->driver->size_type) {
 862                         case U8_APER_SIZE:
 863                                 size = A_SIZE_8(temp)->size;
 864                                 page_order =
 865                                     A_SIZE_8(temp)->page_order;
 866                                 num_entries =
 867                                     A_SIZE_8(temp)->num_entries;
 868                                 break;
 869                         case U16_APER_SIZE:
 870                                 size = A_SIZE_16(temp)->size;
 871                                 page_order = A_SIZE_16(temp)->page_order;
 872                                 num_entries = A_SIZE_16(temp)->num_entries;
 873                                 break;
 874                         case U32_APER_SIZE:
 875                                 size = A_SIZE_32(temp)->size;
 876                                 page_order = A_SIZE_32(temp)->page_order;
 877                                 num_entries = A_SIZE_32(temp)->num_entries;
 878                                 break;
 879                                 /* This case will never really happen. */
 880                         case FIXED_APER_SIZE:
 881                         case LVL2_APER_SIZE:
 882                         default:
 883                                 size = page_order = num_entries = 0;
 884                                 break;
 885                         }
 886
 887                         table = alloc_gatt_pages(page_order);
 888
 889                         if (table == NULL) {
 890                                 i++;
 891                                 switch (bridge->driver->size_type) {
 892                                 case U8_APER_SIZE:
 893                                         bridge->current_size = A_IDX8(bridge);
 894                                         break;
 895                                 case U16_APER_SIZE:
 896                                         bridge->current_size = A_IDX16(bridge);
 897                                         break;
 898                                 case U32_APER_SIZE:
 899                                         bridge->current_size = A_IDX32(bridge);
 900                                         break;
 901                                 /* These cases will never really happen. */
 902                                 case FIXED_APER_SIZE:
 903                                 case LVL2_APER_SIZE:
 904                                 default:
 905                                         break;
 906                                 }
 907                                 temp = bridge->current_size;
 908                         } else {
 909                                 bridge->aperture_size_idx = i;
 910                         }
 911                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 912         } else {
 913                 size = ((struct aper_size_info_fixed *) temp)->size;
 914                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 915                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 916                 table = alloc_gatt_pages(page_order);
 917         }
 918
 919         if (table == NULL)
 920                 return -ENOMEM;
 921
 922         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 923
 924         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 925                 SetPageReserved(page);
 926
 927         bridge->gatt_table_real = (u32 *) table;
 928         agp_gatt_table = (void *)table;
 929
 930         bridge->driver->cache_flush();
 931         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 932                                         (PAGE_SIZE * (1 << page_order)));
 933         bridge->driver->cache_flush();
 934
 935         if (bridge->gatt_table == NULL) {
 936                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 937                         ClearPageReserved(page);
 938
 939                 free_gatt_pages(table, page_order);
 940
 941                 return -ENOMEM;
 942         }
 943         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 944
 945         /* AK: bogus, should encode addresses > 4GB */
 946         for (i = 0; i < num_entries; i++) {
 947                 writel(bridge->scratch_page, bridge->gatt_table+i);
 948                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 949         }
 950
 951         return 0;
 952 }
 953 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 954
 955 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 956 {
 957         int page_order;
 958         char *table, *table_end;
 959         void *temp;
 960         struct page *page;
 961
 962         temp = bridge->current_size;
 963
 964         switch (bridge->driver->size_type) {
 965         case U8_APER_SIZE:
 966                 page_order = A_SIZE_8(temp)->page_order;
 967                 break;
 968         case U16_APER_SIZE:
 969                 page_order = A_SIZE_16(temp)->page_order;
 970                 break;
 971         case U32_APER_SIZE:
 972                 page_order = A_SIZE_32(temp)->page_order;
 973                 break;
 974         case FIXED_APER_SIZE:
 975                 page_order = A_SIZE_FIX(temp)->page_order;
 976                 break;
 977         case LVL2_APER_SIZE:
 978                 /* The generic routines can't deal with 2 level gatt's */
 979                 return -EINVAL;
 980                 break;
 981         default:
 982                 page_order = 0;
 983                 break;
 984         }
 985
 986         /* Do not worry about freeing memory, because if this is
 987          * called, then all agp memory is deallocated and removed
 988          * from the table. */
 989
 990         iounmap(bridge->gatt_table);
 991         table = (char *) bridge->gatt_table_real;
 992         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 993
 994         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 995                 ClearPageReserved(page);
 996
 997         free_gatt_pages(bridge->gatt_table_real, page_order);
 998
 999         agp_gatt_table = NULL;
1000         bridge->gatt_table = NULL;
1001         bridge->gatt_table_real = NULL;
1002         bridge->gatt_bus_addr = 0;
1003
1004         return 0;
1005 }
1006 EXPORT_SYMBOL(agp_generic_free_gatt_table);
1007
1008
1009 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1010 {
1011         int num_entries;
1012         size_t i;
1013         off_t j;
1014         void *temp;
1015         struct agp_bridge_data *bridge;
1016         int mask_type;
1017
1018         bridge = mem->bridge;
1019         if (!bridge)
1020                 return -EINVAL;
1021
1022         if (mem->page_count == 0)
1023                 return 0;
1024
1025         temp = bridge->current_size;
1026
1027         switch (bridge->driver->size_type) {
1028         case U8_APER_SIZE:
1029                 num_entries = A_SIZE_8(temp)->num_entries;
1030                 break;
1031         case U16_APER_SIZE:
1032                 num_entries = A_SIZE_16(temp)->num_entries;
1033                 break;
1034         case U32_APER_SIZE:
1035                 num_entries = A_SIZE_32(temp)->num_entries;
1036                 break;
1037         case FIXED_APER_SIZE:
1038                 num_entries = A_SIZE_FIX(temp)->num_entries;
1039                 break;
1040         case LVL2_APER_SIZE:
1041                 /* The generic routines can't deal with 2 level gatt's */
1042                 return -EINVAL;
1043                 break;
1044         default:
1045                 num_entries = 0;
1046                 break;
1047         }
1048
1049         num_entries -= agp_memory_reserved/PAGE_SIZE;
1050         if (num_entries < 0) num_entries = 0;
1051
1052         if (type != mem->type)
1053                 return -EINVAL;
1054
1055         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1056         if (mask_type != 0) {
1057                 /* The generic routines know nothing of memory types */
1058                 return -EINVAL;
1059         }
1060
1061         /* AK: could wrap */
1062         if ((pg_start + mem->page_count) > num_entries)
1063                 return -EINVAL;
1064
1065         j = pg_start;
1066
1067         while (j < (pg_start + mem->page_count)) {
1068                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1069                         return -EBUSY;
1070                 j++;
1071         }
1072
1073         if (mem->is_flushed == FALSE) {
1074                 bridge->driver->cache_flush();
1075                 mem->is_flushed = TRUE;
1076         }
1077
1078         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1079                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mask_type),
1080                        bridge->gatt_table+j);
1081         }
1082         readl(bridge->gatt_table+j-1);  /* PCI Posting. */
1083
1084         bridge->driver->tlb_flush(mem);
1085         return 0;
1086 }
1087 EXPORT_SYMBOL(agp_generic_insert_memory);
1088
1089
1090 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1091 {
1092         size_t i;
1093         struct agp_bridge_data *bridge;
1094         int mask_type;
1095
1096         bridge = mem->bridge;
1097         if (!bridge)
1098                 return -EINVAL;
1099
1100         if (mem->page_count == 0)
1101                 return 0;
1102
1103         if (type != mem->type)
1104                 return -EINVAL;
1105
1106         mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1107         if (mask_type != 0) {
1108                 /* The generic routines know nothing of memory types */
1109                 return -EINVAL;
1110         }
1111
1112         /* AK: bogus, should encode addresses > 4GB */
1113         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1114                 writel(bridge->scratch_page, bridge->gatt_table+i);
1115         }
1116         readl(bridge->gatt_table+i-1);  /* PCI Posting. */
1117
1118         bridge->driver->tlb_flush(mem);
1119         return 0;
1120 }
1121 EXPORT_SYMBOL(agp_generic_remove_memory);
1122
1123 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1124 {
1125         return NULL;
1126 }
1127 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1128
1129 void agp_generic_free_by_type(struct agp_memory *curr)
1130 {
1131         agp_free_page_array(curr);
1132         agp_free_key(curr->key);
1133         kfree(curr);
1134 }
1135 EXPORT_SYMBOL(agp_generic_free_by_type);
1136
1137 struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1138 {
1139         struct agp_memory *new;
1140         int i;
1141         int pages;
1142
1143         pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1144         new = agp_create_user_memory(page_count);
1145         if (new == NULL)
1146                 return NULL;
1147
1148         for (i = 0; i < page_count; i++)
1149                 new->memory[i] = 0;
1150         new->page_count = 0;
1151         new->type = type;
1152         new->num_scratch_pages = pages;
1153
1154         return new;
1155 }
1156 EXPORT_SYMBOL(agp_generic_alloc_user);
1157
1158 /*
1159  * Basic Page Allocation Routines -
1160  * These routines handle page allocation and by default they reserve the allocated
1161  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1162  * against a maximum value.
1163  */
1164
1165 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1166 {
1167         struct page * page;
1168
1169         page = alloc_page(GFP_KERNEL | GFP_DMA32);
1170         if (page == NULL)
1171                 return NULL;
1172
1173         map_page_into_agp(page);
1174
1175         get_page(page);
1176         atomic_inc(&agp_bridge->current_memory_agp);
1177         return page_address(page);
1178 }
1179 EXPORT_SYMBOL(agp_generic_alloc_page);
1180
1181
1182 void agp_generic_destroy_page(void *addr, int flags)
1183 {
1184         struct page *page;
1185
1186         if (addr == NULL)
1187                 return;
1188
1189         page = virt_to_page(addr);
1190         if (flags & AGP_PAGE_DESTROY_UNMAP)
1191                 unmap_page_from_agp(page);
1192
1193         if (flags & AGP_PAGE_DESTROY_FREE) {
1194                 put_page(page);
1195                 free_page((unsigned long)addr);
1196                 atomic_dec(&agp_bridge->current_memory_agp);
1197         }
1198 }
1199 EXPORT_SYMBOL(agp_generic_destroy_page);
1200
1201 /* End Basic Page Allocation Routines */
1202
1203
1204 /**
1205  * agp_enable  -  initialise the agp point-to-point connection.
1206  *
1207  * @mode:       agp mode register value to configure with.
1208  */
1209 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1210 {
1211         if (!bridge)
1212                 return;
1213         bridge->driver->agp_enable(bridge, mode);
1214 }
1215 EXPORT_SYMBOL(agp_enable);
1216
1217 /* When we remove the global variable agp_bridge from all drivers
1218  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1219  */
1220
1221 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1222 {
1223         if (list_empty(&agp_bridges))
1224                 return NULL;
1225
1226         return agp_bridge;
1227 }
1228
1229 static void ipi_handler(void *null)
1230 {
1231         flush_agp_cache();
1232 }
1233
1234 void global_cache_flush(void)
1235 {
1236         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1237                 panic(PFX "timed out waiting for the other CPUs!\n");
1238 }
1239 EXPORT_SYMBOL(global_cache_flush);
1240
1241 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1242         unsigned long addr, int type)
1243 {
1244         /* memory type is ignored in the generic routine */
1245         if (bridge->driver->masks)
1246                 return addr | bridge->driver->masks[0].mask;
1247         else
1248                 return addr;
1249 }
1250 EXPORT_SYMBOL(agp_generic_mask_memory);
1251
1252 int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1253                                   int type)
1254 {
1255         if (type >= AGP_USER_TYPES)
1256                 return 0;
1257         return type;
1258 }
1259 EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1260
1261 /*
1262  * These functions are implemented according to the AGPv3 spec,
1263  * which covers implementation details that had previously been
1264  * left open.
1265  */
1266
1267 int agp3_generic_fetch_size(void)
1268 {
1269         u16 temp_size;
1270         int i;
1271         struct aper_size_info_16 *values;
1272
1273         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1274         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1275
1276         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1277                 if (temp_size == values[i].size_value) {
1278                         agp_bridge->previous_size =
1279                                 agp_bridge->current_size = (void *) (values + i);
1280
1281                         agp_bridge->aperture_size_idx = i;
1282                         return values[i].size;
1283                 }
1284         }
1285         return 0;
1286 }
1287 EXPORT_SYMBOL(agp3_generic_fetch_size);
1288
1289 void agp3_generic_tlbflush(struct agp_memory *mem)
1290 {
1291         u32 ctrl;
1292         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1293         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1294         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1295 }
1296 EXPORT_SYMBOL(agp3_generic_tlbflush);
1297
1298 int agp3_generic_configure(void)
1299 {
1300         u32 temp;
1301         struct aper_size_info_16 *current_size;
1302
1303         current_size = A_SIZE_16(agp_bridge->current_size);
1304
1305         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1306         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1307
1308         /* set aperture size */
1309         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1310         /* set gart pointer */
1311         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1312         /* enable aperture and GTLB */
1313         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1314         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1315         return 0;
1316 }
1317 EXPORT_SYMBOL(agp3_generic_configure);
1318
1319 void agp3_generic_cleanup(void)
1320 {
1321         u32 ctrl;
1322         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1323         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1324 }
1325 EXPORT_SYMBOL(agp3_generic_cleanup);
1326
1327 const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1328 {
1329         {4096, 1048576, 10,0x000},
1330         {2048,  524288, 9, 0x800},
1331         {1024,  262144, 8, 0xc00},
1332         { 512,  131072, 7, 0xe00},
1333         { 256,   65536, 6, 0xf00},
1334         { 128,   32768, 5, 0xf20},
1335         {  64,   16384, 4, 0xf30},
1336         {  32,    8192, 3, 0xf38},
1337         {  16,    4096, 2, 0xf3c},
1338         {   8,    2048, 1, 0xf3e},
1339         {   4,    1024, 0, 0xf3f}
1340 };
1341 EXPORT_SYMBOL(agp3_generic_sizes);
1342