git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  31 #include <linux/module.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/miscdevice.h>
  36 #include <linux/pm.h>
  37 #include <linux/agp_backend.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/mm.h>
  41 #include <asm/io.h>
  42 #include <asm/cacheflush.h>
  43 #include <asm/pgtable.h>
  44 #include "agp.h"
  45
  46 __u32 *agp_gatt_table;
  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 #if defined(CONFIG_X86)
  56 int map_page_into_agp(struct page *page)
  57 {
  58         int i;
  59         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
  60         global_flush_tlb();
  61         return i;
  62 }
  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         global_flush_tlb();
  70         return i;
  71 }
  72 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  73 #endif
  74
  75 /*
  76  * Generic routines for handling agp_memory structures -
  77  * They use the basic page allocation routines to do the brunt of the work.
  78  */
  79
  80 void agp_free_key(int key)
  81 {
  82         if (key < 0)
  83                 return;
  84
  85         if (key < MAXKEY)
  86                 clear_bit(key, agp_bridge->key_list);
  87 }
  88 EXPORT_SYMBOL(agp_free_key);
  89
  90
  91 static int agp_get_key(void)
  92 {
  93         int bit;
  94
  95         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  96         if (bit < MAXKEY) {
  97                 set_bit(bit, agp_bridge->key_list);
  98                 return bit;
  99         }
 100         return -1;
 101 }
 102
 103
 104 struct agp_memory *agp_create_memory(int scratch_pages)
 105 {
 106         struct agp_memory *new;
 107
 108         new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
 109
 110         if (new == NULL)
 111                 return NULL;
 112
 113         memset(new, 0, sizeof(struct agp_memory));
 114         new->key = agp_get_key();
 115
 116         if (new->key < 0) {
 117                 kfree(new);
 118                 return NULL;
 119         }
 120         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
 121
 122         if (new->memory == NULL) {
 123                 agp_free_key(new->key);
 124                 kfree(new);
 125                 return NULL;
 126         }
 127         new->num_scratch_pages = scratch_pages;
 128         return new;
 129 }
 130 EXPORT_SYMBOL(agp_create_memory);
 131
 132 /**
 133  *      agp_free_memory - free memory associated with an agp_memory pointer.
 134  *
 135  *      @curr:          agp_memory pointer to be freed.
 136  *
 137  *      It is the only function that can be called when the backend is not owned
 138  *      by the caller.  (So it can free memory on client death.)
 139  */
 140 void agp_free_memory(struct agp_memory *curr)
 141 {
 142         size_t i;
 143
 144         if (curr == NULL)
 145                 return;
 146
 147         if (curr->is_bound == TRUE)
 148                 agp_unbind_memory(curr);
 149
 150         if (curr->type != 0) {
 151                 curr->bridge->driver->free_by_type(curr);
 152                 return;
 153         }
 154         if (curr->page_count != 0) {
 155                 for (i = 0; i < curr->page_count; i++) {
 156                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
 157                 }
 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->mode = bridge->mode;
 323         info->aper_base = bridge->gart_bus_addr;
 324         info->aper_size = agp_return_size();
 325         info->max_memory = bridge->max_memory_agp;
 326         info->current_memory = atomic_read(&bridge->current_memory_agp);
 327         info->cant_use_aperture = bridge->driver->cant_use_aperture;
 328         info->vm_ops = bridge->vm_ops;
 329         info->page_mask = ~0UL;
 330         return 0;
 331 }
 332 EXPORT_SYMBOL(agp_copy_info);
 333
 334 /* End - Routine to copy over information structure */
 335
 336 /*
 337  * Routines for handling swapping of agp_memory into the GATT -
 338  * These routines take agp_memory and insert them into the GATT.
 339  * They call device specific routines to actually write to the GATT.
 340  */
 341
 342 /**
 343  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 344  *
 345  *      @curr:          agp_memory pointer
 346  *      @pg_start:      an offset into the graphics aperture translation table
 347  *
 348  *      It returns -EINVAL if the pointer == NULL.
 349  *      It returns -EBUSY if the area of the table requested is already in use.
 350  */
 351 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 352 {
 353         int ret_val;
 354
 355         if (curr == NULL)
 356                 return -EINVAL;
 357
 358         if (curr->is_bound == TRUE) {
 359                 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
 360                 return -EINVAL;
 361         }
 362         if (curr->is_flushed == FALSE) {
 363                 curr->bridge->driver->cache_flush();
 364                 curr->is_flushed = TRUE;
 365         }
 366         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 367
 368         if (ret_val != 0)
 369                 return ret_val;
 370
 371         curr->is_bound = TRUE;
 372         curr->pg_start = pg_start;
 373         return 0;
 374 }
 375 EXPORT_SYMBOL(agp_bind_memory);
 376
 377
 378 /**
 379  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 380  *
 381  * @curr:       agp_memory pointer to be removed from the GATT.
 382  *
 383  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 384  * the graphics aperture translation table or if the agp_memory pointer == NULL
 385  */
 386 int agp_unbind_memory(struct agp_memory *curr)
 387 {
 388         int ret_val;
 389
 390         if (curr == NULL)
 391                 return -EINVAL;
 392
 393         if (curr->is_bound != TRUE) {
 394                 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
 395                 return -EINVAL;
 396         }
 397
 398         ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 399
 400         if (ret_val != 0)
 401                 return ret_val;
 402
 403         curr->is_bound = FALSE;
 404         curr->pg_start = 0;
 405         return 0;
 406 }
 407 EXPORT_SYMBOL(agp_unbind_memory);
 408
 409 /* End - Routines for handling swapping of agp_memory into the GATT */
 410
 411
 412 /* Generic Agp routines - Start */
 413 static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 414 {
 415         u32 tmp;
 416
 417         if (*requested_mode & AGP2_RESERVED_MASK) {
 418                 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 419                 *requested_mode &= ~AGP2_RESERVED_MASK;
 420         }
 421
 422         /* Check the speed bits make sense. Only one should be set. */
 423         tmp = *requested_mode & 7;
 424         switch (tmp) {
 425                 case 0:
 426                         printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
 427                         *requested_mode |= AGPSTAT2_1X;
 428                         break;
 429                 case 1:
 430                 case 2:
 431                         break;
 432                 case 3:
 433                         *requested_mode &= ~(AGPSTAT2_1X);      /* rate=2 */
 434                         break;
 435                 case 4:
 436                         break;
 437                 case 5:
 438                 case 6:
 439                 case 7:
 440                         *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
 441                         break;
 442         }
 443
 444         /* disable SBA if it's not supported */
 445         if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
 446                 *bridge_agpstat &= ~AGPSTAT_SBA;
 447
 448         /* Set rate */
 449         if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
 450                 *bridge_agpstat &= ~AGPSTAT2_4X;
 451
 452         if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
 453                 *bridge_agpstat &= ~AGPSTAT2_2X;
 454
 455         if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
 456                 *bridge_agpstat &= ~AGPSTAT2_1X;
 457
 458         /* Now we know what mode it should be, clear out the unwanted bits. */
 459         if (*bridge_agpstat & AGPSTAT2_4X)
 460                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);        /* 4X */
 461
 462         if (*bridge_agpstat & AGPSTAT2_2X)
 463                 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);        /* 2X */
 464
 465         if (*bridge_agpstat & AGPSTAT2_1X)
 466                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);        /* 1X */
 467
 468         /* Apply any errata. */
 469         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 470                 *bridge_agpstat &= ~AGPSTAT_FW;
 471
 472         if (agp_bridge->flags & AGP_ERRATA_SBA)
 473                 *bridge_agpstat &= ~AGPSTAT_SBA;
 474
 475         if (agp_bridge->flags & AGP_ERRATA_1X) {
 476                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 477                 *bridge_agpstat |= AGPSTAT2_1X;
 478         }
 479
 480         /* If we've dropped down to 1X, disable fast writes. */
 481         if (*bridge_agpstat & AGPSTAT2_1X)
 482                 *bridge_agpstat &= ~AGPSTAT_FW;
 483 }
 484
 485 /*
 486  * requested_mode = Mode requested by (typically) X.
 487  * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 488  * vga_agpstat = PCI_AGP_STATUS from graphic card.
 489  */
 490 static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
 491 {
 492         u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
 493         u32 tmp;
 494
 495         if (*requested_mode & AGP3_RESERVED_MASK) {
 496                 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
 497                 *requested_mode &= ~AGP3_RESERVED_MASK;
 498         }
 499
 500         /* Check the speed bits make sense. */
 501         tmp = *requested_mode & 7;
 502         if (tmp == 0) {
 503                 printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
 504                 *requested_mode |= AGPSTAT3_4X;
 505         }
 506         if (tmp >= 3) {
 507                 printk (KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
 508                 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
 509         }
 510
 511         /* ARQSZ - Set the value to the maximum one.
 512          * Don't allow the mode register to override values. */
 513         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
 514                 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
 515
 516         /* Calibration cycle.
 517          * Don't allow the mode register to override values. */
 518         *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
 519                 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
 520
 521         /* SBA *must* be supported for AGP v3 */
 522         *bridge_agpstat |= AGPSTAT_SBA;
 523
 524         /*
 525          * Set speed.
 526          * Check for invalid speeds. This can happen when applications
 527          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 528          */
 529         if (*requested_mode & AGPSTAT_MODE_3_0) {
 530                 /*
 531                  * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
 532                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 533                  * AGP2.x 4x -> AGP3.0 4x.
 534                  */
 535                 if (*requested_mode & AGPSTAT2_4X) {
 536                         printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 537                                                 current->comm, *requested_mode);
 538                         *requested_mode &= ~AGPSTAT2_4X;
 539                         *requested_mode |= AGPSTAT3_4X;
 540                 }
 541         } else {
 542                 /*
 543                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 544                  * but have been passed an AGP 2.x mode.
 545                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 546                  */
 547                 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 548                                         current->comm, *requested_mode);
 549                 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 550                 *requested_mode |= AGPSTAT3_4X;
 551         }
 552
 553         if (*requested_mode & AGPSTAT3_8X) {
 554                 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
 555                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 556                         *bridge_agpstat |= AGPSTAT3_4X;
 557                         printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
 558                         return;
 559                 }
 560                 if (!(*vga_agpstat & AGPSTAT3_8X)) {
 561                         *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 562                         *bridge_agpstat |= AGPSTAT3_4X;
 563                         printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
 564                         return;
 565                 }
 566                 /* All set, bridge & device can do AGP x8*/
 567                 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 568                 goto done;
 569
 570         } else {
 571
 572                 /*
 573                  * If we didn't specify AGPx8, we can only do x4.
 574                  * If the hardware can't do x4, we're up shit creek, and never
 575                  *  should have got this far.
 576                  */
 577                 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 578                 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
 579                         *bridge_agpstat |= AGPSTAT3_4X;
 580                 else {
 581                         printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 582                                                         "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
 583                                                         origbridge, origvga, *bridge_agpstat, *vga_agpstat);
 584                         if (!(*bridge_agpstat & AGPSTAT3_4X))
 585                                 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 586                         if (!(*vga_agpstat & AGPSTAT3_4X))
 587                                 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 588                         return;
 589                 }
 590         }
 591
 592 done:
 593         /* Apply any errata. */
 594         if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
 595                 *bridge_agpstat &= ~AGPSTAT_FW;
 596
 597         if (agp_bridge->flags & AGP_ERRATA_SBA)
 598                 *bridge_agpstat &= ~AGPSTAT_SBA;
 599
 600         if (agp_bridge->flags & AGP_ERRATA_1X) {
 601                 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
 602                 *bridge_agpstat |= AGPSTAT2_1X;
 603         }
 604 }
 605
 606
 607 /**
 608  * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 609  * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 610  * @requested_mode: requested agp_stat from userspace (Typically from X)
 611  * @bridge_agpstat: current agp_stat from AGP bridge.
 612  *
 613  * This function will hunt for an AGP graphics card, and try to match
 614  * the requested mode to the capabilities of both the bridge and the card.
 615  */
 616 u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
 617 {
 618         struct pci_dev *device = NULL;
 619         u32 vga_agpstat;
 620         u8 cap_ptr;
 621
 622         for (;;) {
 623                 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
 624                 if (!device) {
 625                         printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 626                         return 0;
 627                 }
 628                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 629                 if (cap_ptr)
 630                         break;
 631         }
 632
 633         /*
 634          * Ok, here we have a AGP device. Disable impossible
 635          * settings, and adjust the readqueue to the minimum.
 636          */
 637         pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
 638
 639         /* adjust RQ depth */
 640         bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
 641              min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
 642                  min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
 643
 644         /* disable FW if it's not supported */
 645         if (!((bridge_agpstat & AGPSTAT_FW) &&
 646                  (vga_agpstat & AGPSTAT_FW) &&
 647                  (requested_mode & AGPSTAT_FW)))
 648                 bridge_agpstat &= ~AGPSTAT_FW;
 649
 650         /* Check to see if we are operating in 3.0 mode */
 651         if (agp_bridge->mode & AGPSTAT_MODE_3_0)
 652                 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 653         else
 654                 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
 655
 656         pci_dev_put(device);
 657         return bridge_agpstat;
 658 }
 659 EXPORT_SYMBOL(agp_collect_device_status);
 660
 661
 662 void agp_device_command(u32 bridge_agpstat, int agp_v3)
 663 {
 664         struct pci_dev *device = NULL;
 665         int mode;
 666
 667         mode = bridge_agpstat & 0x7;
 668         if (agp_v3)
 669                 mode *= 4;
 670
 671         for_each_pci_dev(device) {
 672                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 673                 if (!agp)
 674                         continue;
 675
 676                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 677                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 678                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
 679         }
 680 }
 681 EXPORT_SYMBOL(agp_device_command);
 682
 683
 684 void get_agp_version(struct agp_bridge_data *bridge)
 685 {
 686         u32 ncapid;
 687
 688         /* Exit early if already set by errata workarounds. */
 689         if (bridge->major_version != 0)
 690                 return;
 691
 692         pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
 693         bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 694         bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 695 }
 696 EXPORT_SYMBOL(get_agp_version);
 697
 698
 699 void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
 700 {
 701         u32 bridge_agpstat, temp;
 702
 703         get_agp_version(agp_bridge);
 704
 705         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 706                                 agp_bridge->major_version,
 707                                 agp_bridge->minor_version,
 708                                 pci_name(agp_bridge->dev));
 709
 710         pci_read_config_dword(agp_bridge->dev,
 711                       agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
 712
 713         bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
 714         if (bridge_agpstat == 0)
 715                 /* Something bad happened. FIXME: Return error code? */
 716                 return;
 717
 718         bridge_agpstat |= AGPSTAT_AGP_ENABLE;
 719
 720         /* Do AGP version specific frobbing. */
 721         if (bridge->major_version >= 3) {
 722                 if (bridge->mode & AGPSTAT_MODE_3_0) {
 723                         /* If we have 3.5, we can do the isoch stuff. */
 724                         if (bridge->minor_version >= 5)
 725                                 agp_3_5_enable(bridge);
 726                         agp_device_command(bridge_agpstat, TRUE);
 727                         return;
 728                 } else {
 729                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 730                     bridge_agpstat &= ~(7<<10) ;
 731                     pci_read_config_dword(bridge->dev,
 732                                         bridge->capndx+AGPCTRL, &temp);
 733                     temp |= (1<<9);
 734                     pci_write_config_dword(bridge->dev,
 735                                         bridge->capndx+AGPCTRL, temp);
 736
 737                     printk (KERN_INFO PFX "Device is in legacy mode,"
 738                                 " falling back to 2.x\n");
 739                 }
 740         }
 741
 742         /* AGP v<3 */
 743         agp_device_command(bridge_agpstat, FALSE);
 744 }
 745 EXPORT_SYMBOL(agp_generic_enable);
 746
 747
 748 int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
 749 {
 750         char *table;
 751         char *table_end;
 752         int size;
 753         int page_order;
 754         int num_entries;
 755         int i;
 756         void *temp;
 757         struct page *page;
 758
 759         /* The generic routines can't handle 2 level gatt's */
 760         if (bridge->driver->size_type == LVL2_APER_SIZE)
 761                 return -EINVAL;
 762
 763         table = NULL;
 764         i = bridge->aperture_size_idx;
 765         temp = bridge->current_size;
 766         size = page_order = num_entries = 0;
 767
 768         if (bridge->driver->size_type != FIXED_APER_SIZE) {
 769                 do {
 770                         switch (bridge->driver->size_type) {
 771                         case U8_APER_SIZE:
 772                                 size = A_SIZE_8(temp)->size;
 773                                 page_order =
 774                                     A_SIZE_8(temp)->page_order;
 775                                 num_entries =
 776                                     A_SIZE_8(temp)->num_entries;
 777                                 break;
 778                         case U16_APER_SIZE:
 779                                 size = A_SIZE_16(temp)->size;
 780                                 page_order = A_SIZE_16(temp)->page_order;
 781                                 num_entries = A_SIZE_16(temp)->num_entries;
 782                                 break;
 783                         case U32_APER_SIZE:
 784                                 size = A_SIZE_32(temp)->size;
 785                                 page_order = A_SIZE_32(temp)->page_order;
 786                                 num_entries = A_SIZE_32(temp)->num_entries;
 787                                 break;
 788                                 /* This case will never really happen. */
 789                         case FIXED_APER_SIZE:
 790                         case LVL2_APER_SIZE:
 791                         default:
 792                                 size = page_order = num_entries = 0;
 793                                 break;
 794                         }
 795
 796                         table = alloc_gatt_pages(page_order);
 797
 798                         if (table == NULL) {
 799                                 i++;
 800                                 switch (bridge->driver->size_type) {
 801                                 case U8_APER_SIZE:
 802                                         bridge->current_size = A_IDX8(bridge);
 803                                         break;
 804                                 case U16_APER_SIZE:
 805                                         bridge->current_size = A_IDX16(bridge);
 806                                         break;
 807                                 case U32_APER_SIZE:
 808                                         bridge->current_size = A_IDX32(bridge);
 809                                         break;
 810                                         /* This case will never really happen. */
 811                                 case FIXED_APER_SIZE:
 812                                 case LVL2_APER_SIZE:
 813                                 default:
 814                                         bridge->current_size =
 815                                             bridge->current_size;
 816                                         break;
 817                                 }
 818                                 temp = bridge->current_size;
 819                         } else {
 820                                 bridge->aperture_size_idx = i;
 821                         }
 822                 } while (!table && (i < bridge->driver->num_aperture_sizes));
 823         } else {
 824                 size = ((struct aper_size_info_fixed *) temp)->size;
 825                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 826                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 827                 table = alloc_gatt_pages(page_order);
 828         }
 829
 830         if (table == NULL)
 831                 return -ENOMEM;
 832
 833         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 834
 835         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 836                 SetPageReserved(page);
 837
 838         bridge->gatt_table_real = (u32 *) table;
 839         agp_gatt_table = (void *)table;
 840
 841         bridge->driver->cache_flush();
 842         bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
 843                                         (PAGE_SIZE * (1 << page_order)));
 844         bridge->driver->cache_flush();
 845
 846         if (bridge->gatt_table == NULL) {
 847                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 848                         ClearPageReserved(page);
 849
 850                 free_gatt_pages(table, page_order);
 851
 852                 return -ENOMEM;
 853         }
 854         bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
 855
 856         /* AK: bogus, should encode addresses > 4GB */
 857         for (i = 0; i < num_entries; i++) {
 858                 writel(bridge->scratch_page, bridge->gatt_table+i);
 859                 readl(bridge->gatt_table+i);    /* PCI Posting. */
 860         }
 861
 862         return 0;
 863 }
 864 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 865
 866 int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
 867 {
 868         int page_order;
 869         char *table, *table_end;
 870         void *temp;
 871         struct page *page;
 872
 873         temp = bridge->current_size;
 874
 875         switch (bridge->driver->size_type) {
 876         case U8_APER_SIZE:
 877                 page_order = A_SIZE_8(temp)->page_order;
 878                 break;
 879         case U16_APER_SIZE:
 880                 page_order = A_SIZE_16(temp)->page_order;
 881                 break;
 882         case U32_APER_SIZE:
 883                 page_order = A_SIZE_32(temp)->page_order;
 884                 break;
 885         case FIXED_APER_SIZE:
 886                 page_order = A_SIZE_FIX(temp)->page_order;
 887                 break;
 888         case LVL2_APER_SIZE:
 889                 /* The generic routines can't deal with 2 level gatt's */
 890                 return -EINVAL;
 891                 break;
 892         default:
 893                 page_order = 0;
 894                 break;
 895         }
 896
 897         /* Do not worry about freeing memory, because if this is
 898          * called, then all agp memory is deallocated and removed
 899          * from the table. */
 900
 901         iounmap(bridge->gatt_table);
 902         table = (char *) bridge->gatt_table_real;
 903         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 904
 905         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 906                 ClearPageReserved(page);
 907
 908         free_gatt_pages(bridge->gatt_table_real, page_order);
 909
 910         agp_gatt_table = NULL;
 911         bridge->gatt_table = NULL;
 912         bridge->gatt_table_real = NULL;
 913         bridge->gatt_bus_addr = 0;
 914
 915         return 0;
 916 }
 917 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 918
 919
 920 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 921 {
 922         int num_entries;
 923         size_t i;
 924         off_t j;
 925         void *temp;
 926         struct agp_bridge_data *bridge;
 927
 928         bridge = mem->bridge;
 929         if (!bridge)
 930                 return -EINVAL;
 931
 932         temp = bridge->current_size;
 933
 934         switch (bridge->driver->size_type) {
 935         case U8_APER_SIZE:
 936                 num_entries = A_SIZE_8(temp)->num_entries;
 937                 break;
 938         case U16_APER_SIZE:
 939                 num_entries = A_SIZE_16(temp)->num_entries;
 940                 break;
 941         case U32_APER_SIZE:
 942                 num_entries = A_SIZE_32(temp)->num_entries;
 943                 break;
 944         case FIXED_APER_SIZE:
 945                 num_entries = A_SIZE_FIX(temp)->num_entries;
 946                 break;
 947         case LVL2_APER_SIZE:
 948                 /* The generic routines can't deal with 2 level gatt's */
 949                 return -EINVAL;
 950                 break;
 951         default:
 952                 num_entries = 0;
 953                 break;
 954         }
 955
 956         num_entries -= agp_memory_reserved/PAGE_SIZE;
 957         if (num_entries < 0) num_entries = 0;
 958
 959         if (type != 0 || mem->type != 0) {
 960                 /* The generic routines know nothing of memory types */
 961                 return -EINVAL;
 962         }
 963
 964         /* AK: could wrap */
 965         if ((pg_start + mem->page_count) > num_entries)
 966                 return -EINVAL;
 967
 968         j = pg_start;
 969
 970         while (j < (pg_start + mem->page_count)) {
 971                 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
 972                         return -EBUSY;
 973                 j++;
 974         }
 975
 976         if (mem->is_flushed == FALSE) {
 977                 bridge->driver->cache_flush();
 978                 mem->is_flushed = TRUE;
 979         }
 980
 981         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 982                 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
 983                 readl(bridge->gatt_table+j);    /* PCI Posting. */
 984         }
 985
 986         bridge->driver->tlb_flush(mem);
 987         return 0;
 988 }
 989 EXPORT_SYMBOL(agp_generic_insert_memory);
 990
 991
 992 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 993 {
 994         size_t i;
 995         struct agp_bridge_data *bridge;
 996
 997         bridge = mem->bridge;
 998         if (!bridge)
 999                 return -EINVAL;
1000
1001         if (type != 0 || mem->type != 0) {
1002                 /* The generic routines know nothing of memory types */
1003                 return -EINVAL;
1004         }
1005
1006         /* AK: bogus, should encode addresses > 4GB */
1007         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1008                 writel(bridge->scratch_page, bridge->gatt_table+i);
1009                 readl(bridge->gatt_table+i);    /* PCI Posting. */
1010         }
1011
1012         global_cache_flush();
1013         bridge->driver->tlb_flush(mem);
1014         return 0;
1015 }
1016 EXPORT_SYMBOL(agp_generic_remove_memory);
1017
1018
1019 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1020 {
1021         return NULL;
1022 }
1023 EXPORT_SYMBOL(agp_generic_alloc_by_type);
1024
1025
1026 void agp_generic_free_by_type(struct agp_memory *curr)
1027 {
1028         vfree(curr->memory);
1029         agp_free_key(curr->key);
1030         kfree(curr);
1031 }
1032 EXPORT_SYMBOL(agp_generic_free_by_type);
1033
1034
1035 /*
1036  * Basic Page Allocation Routines -
1037  * These routines handle page allocation and by default they reserve the allocated
1038  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
1039  * against a maximum value.
1040  */
1041
1042 void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1043 {
1044         struct page * page;
1045
1046         page = alloc_page(GFP_KERNEL);
1047         if (page == NULL)
1048                 return NULL;
1049
1050         map_page_into_agp(page);
1051
1052         get_page(page);
1053         SetPageLocked(page);
1054         atomic_inc(&agp_bridge->current_memory_agp);
1055         return page_address(page);
1056 }
1057 EXPORT_SYMBOL(agp_generic_alloc_page);
1058
1059
1060 void agp_generic_destroy_page(void *addr)
1061 {
1062         struct page *page;
1063
1064         if (addr == NULL)
1065                 return;
1066
1067         page = virt_to_page(addr);
1068         unmap_page_from_agp(page);
1069         put_page(page);
1070         unlock_page(page);
1071         free_page((unsigned long)addr);
1072         atomic_dec(&agp_bridge->current_memory_agp);
1073 }
1074 EXPORT_SYMBOL(agp_generic_destroy_page);
1075
1076 /* End Basic Page Allocation Routines */
1077
1078
1079 /**
1080  * agp_enable  -  initialise the agp point-to-point connection.
1081  *
1082  * @mode:       agp mode register value to configure with.
1083  */
1084 void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1085 {
1086         if (!bridge)
1087                 return;
1088         bridge->driver->agp_enable(bridge, mode);
1089 }
1090 EXPORT_SYMBOL(agp_enable);
1091
1092 /* When we remove the global variable agp_bridge from all drivers
1093  * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1094  */
1095
1096 struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1097 {
1098         if (list_empty(&agp_bridges))
1099                 return NULL;
1100
1101         return agp_bridge;
1102 }
1103
1104 static void ipi_handler(void *null)
1105 {
1106         flush_agp_cache();
1107 }
1108
1109 void global_cache_flush(void)
1110 {
1111         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1112                 panic(PFX "timed out waiting for the other CPUs!\n");
1113 }
1114 EXPORT_SYMBOL(global_cache_flush);
1115
1116 unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1117         unsigned long addr, int type)
1118 {
1119         /* memory type is ignored in the generic routine */
1120         if (bridge->driver->masks)
1121                 return addr | bridge->driver->masks[0].mask;
1122         else
1123                 return addr;
1124 }
1125 EXPORT_SYMBOL(agp_generic_mask_memory);
1126
1127 /*
1128  * These functions are implemented according to the AGPv3 spec,
1129  * which covers implementation details that had previously been
1130  * left open.
1131  */
1132
1133 int agp3_generic_fetch_size(void)
1134 {
1135         u16 temp_size;
1136         int i;
1137         struct aper_size_info_16 *values;
1138
1139         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1140         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1141
1142         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1143                 if (temp_size == values[i].size_value) {
1144                         agp_bridge->previous_size =
1145                                 agp_bridge->current_size = (void *) (values + i);
1146
1147                         agp_bridge->aperture_size_idx = i;
1148                         return values[i].size;
1149                 }
1150         }
1151         return 0;
1152 }
1153 EXPORT_SYMBOL(agp3_generic_fetch_size);
1154
1155 void agp3_generic_tlbflush(struct agp_memory *mem)
1156 {
1157         u32 ctrl;
1158         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1159         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1160         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1161 }
1162 EXPORT_SYMBOL(agp3_generic_tlbflush);
1163
1164 int agp3_generic_configure(void)
1165 {
1166         u32 temp;
1167         struct aper_size_info_16 *current_size;
1168
1169         current_size = A_SIZE_16(agp_bridge->current_size);
1170
1171         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1172         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1173
1174         /* set aperture size */
1175         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1176         /* set gart pointer */
1177         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1178         /* enable aperture and GTLB */
1179         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1180         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1181         return 0;
1182 }
1183 EXPORT_SYMBOL(agp3_generic_configure);
1184
1185 void agp3_generic_cleanup(void)
1186 {
1187         u32 ctrl;
1188         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1189         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1190 }
1191 EXPORT_SYMBOL(agp3_generic_cleanup);
1192
1193 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1194 {
1195         {4096, 1048576, 10,0x000},
1196         {2048,  524288, 9, 0x800},
1197         {1024,  262144, 8, 0xc00},
1198         { 512,  131072, 7, 0xe00},
1199         { 256,   65536, 6, 0xf00},
1200         { 128,   32768, 5, 0xf20},
1201         {  64,   16384, 4, 0xf30},
1202         {  32,    8192, 3, 0xf38},
1203         {  16,    4096, 2, 0xf3c},
1204         {   8,    2048, 1, 0xf3e},
1205         {   4,    1024, 0, 0xf3f}
1206 };
1207 EXPORT_SYMBOL(agp3_generic_sizes);
1208