drivers/char/agp/generic.c

   1 /*
   2  * AGPGART driver.
   3  * Copyright (C) 2002-2004 Dave Jones.
   4  * Copyright (C) 1999 Jeff Hartmann.
   5  * Copyright (C) 1999 Precision Insight, Inc.
   6  * Copyright (C) 1999 Xi Graphics, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  24  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * TODO:
  27  * - Allocate more than order 0 pages to avoid too much linear map splitting.
  28  */
  29 #include <linux/config.h>
  30 #include <linux/module.h>
  31 #include <linux/pci.h>
  32 #include <linux/init.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/miscdevice.h>
  35 #include <linux/pm.h>
  36 #include <linux/agp_backend.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/mm.h>
  39 #include <asm/io.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/pgtable.h>
  42 #include "agp.h"
  43
  44 __u32 *agp_gatt_table;
  45 int agp_memory_reserved;
  46
  47 /*
  48  * Needed by the Nforce GART driver for the time being. Would be
  49  * nice to do this some other way instead of needing this export.
  50  */
  51 EXPORT_SYMBOL_GPL(agp_memory_reserved);
  52
  53 #if defined(CONFIG_X86)
  54 int map_page_into_agp(struct page *page)
  55 {
  56         int i;
  57         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
  58         global_flush_tlb();
  59         return i;
  60 }
  61 EXPORT_SYMBOL_GPL(map_page_into_agp);
  62
  63 int unmap_page_from_agp(struct page *page)
  64 {
  65         int i;
  66         i = change_page_attr(page, 1, PAGE_KERNEL);
  67         global_flush_tlb();
  68         return i;
  69 }
  70 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
  71 #endif
  72
  73 /*
  74  * Generic routines for handling agp_memory structures -
  75  * They use the basic page allocation routines to do the brunt of the work.
  76  */
  77
  78 void agp_free_key(int key)
  79 {
  80         if (key < 0)
  81                 return;
  82
  83         if (key < MAXKEY)
  84                 clear_bit(key, agp_bridge->key_list);
  85 }
  86 EXPORT_SYMBOL(agp_free_key);
  87
  88
  89 static int agp_get_key(void)
  90 {
  91         int bit;
  92
  93         bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
  94         if (bit < MAXKEY) {
  95                 set_bit(bit, agp_bridge->key_list);
  96                 return bit;
  97         }
  98         return -1;
  99 }
 100
 101
 102 struct agp_memory *agp_create_memory(int scratch_pages)
 103 {
 104         struct agp_memory *new;
 105
 106         new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
 107
 108         if (new == NULL)
 109                 return NULL;
 110
 111         memset(new, 0, sizeof(struct agp_memory));
 112         new->key = agp_get_key();
 113
 114         if (new->key < 0) {
 115                 kfree(new);
 116                 return NULL;
 117         }
 118         new->memory = vmalloc(PAGE_SIZE * scratch_pages);
 119
 120         if (new->memory == NULL) {
 121                 agp_free_key(new->key);
 122                 kfree(new);
 123                 return NULL;
 124         }
 125         new->num_scratch_pages = scratch_pages;
 126         return new;
 127 }
 128 EXPORT_SYMBOL(agp_create_memory);
 129
 130 /**
 131  *      agp_free_memory - free memory associated with an agp_memory pointer.
 132  *
 133  *      @curr:          agp_memory pointer to be freed.
 134  *
 135  *      It is the only function that can be called when the backend is not owned
 136  *      by the caller.  (So it can free memory on client death.)
 137  */
 138 void agp_free_memory(struct agp_memory *curr)
 139 {
 140         size_t i;
 141
 142         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 143                 return;
 144
 145         if (curr->is_bound == TRUE)
 146                 agp_unbind_memory(curr);
 147
 148         if (curr->type != 0) {
 149                 agp_bridge->driver->free_by_type(curr);
 150                 return;
 151         }
 152         if (curr->page_count != 0) {
 153                 for (i = 0; i < curr->page_count; i++) {
 154                         agp_bridge->driver->agp_destroy_page(phys_to_virt(curr->memory[i]));
 155                 }
 156         }
 157         agp_free_key(curr->key);
 158         vfree(curr->memory);
 159         kfree(curr);
 160 }
 161 EXPORT_SYMBOL(agp_free_memory);
 162
 163 #define ENTRIES_PER_PAGE                (PAGE_SIZE / sizeof(unsigned long))
 164
 165 /**
 166  *      agp_allocate_memory  -  allocate a group of pages of a certain type.
 167  *
 168  *      @page_count:    size_t argument of the number of pages
 169  *      @type:  u32 argument of the type of memory to be allocated.
 170  *
 171  *      Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
 172  *      maps to physical ram.  Any other type is device dependent.
 173  *
 174  *      It returns NULL whenever memory is unavailable.
 175  */
 176 struct agp_memory *agp_allocate_memory(size_t page_count, u32 type)
 177 {
 178         int scratch_pages;
 179         struct agp_memory *new;
 180         size_t i;
 181
 182         if (agp_bridge->type == NOT_SUPPORTED)
 183                 return NULL;
 184
 185         if ((atomic_read(&agp_bridge->current_memory_agp) + page_count) > agp_bridge->max_memory_agp)
 186                 return NULL;
 187
 188         if (type != 0) {
 189                 new = agp_bridge->driver->alloc_by_type(page_count, type);
 190                 return new;
 191         }
 192
 193         scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
 194
 195         new = agp_create_memory(scratch_pages);
 196
 197         if (new == NULL)
 198                 return NULL;
 199
 200         for (i = 0; i < page_count; i++) {
 201                 void *addr = agp_bridge->driver->agp_alloc_page();
 202
 203                 if (addr == NULL) {
 204                         agp_free_memory(new);
 205                         return NULL;
 206                 }
 207                 new->memory[i] = virt_to_phys(addr);
 208                 new->page_count++;
 209         }
 210
 211         flush_agp_mappings();
 212
 213         return new;
 214 }
 215 EXPORT_SYMBOL(agp_allocate_memory);
 216
 217
 218 /* End - Generic routines for handling agp_memory structures */
 219
 220
 221 static int agp_return_size(void)
 222 {
 223         int current_size;
 224         void *temp;
 225
 226         temp = agp_bridge->current_size;
 227
 228         switch (agp_bridge->driver->size_type) {
 229         case U8_APER_SIZE:
 230                 current_size = A_SIZE_8(temp)->size;
 231                 break;
 232         case U16_APER_SIZE:
 233                 current_size = A_SIZE_16(temp)->size;
 234                 break;
 235         case U32_APER_SIZE:
 236                 current_size = A_SIZE_32(temp)->size;
 237                 break;
 238         case LVL2_APER_SIZE:
 239                 current_size = A_SIZE_LVL2(temp)->size;
 240                 break;
 241         case FIXED_APER_SIZE:
 242                 current_size = A_SIZE_FIX(temp)->size;
 243                 break;
 244         default:
 245                 current_size = 0;
 246                 break;
 247         }
 248
 249         current_size -= (agp_memory_reserved / (1024*1024));
 250         if (current_size <0)
 251                 current_size = 0;
 252         return current_size;
 253 }
 254
 255
 256 int agp_num_entries(void)
 257 {
 258         int num_entries;
 259         void *temp;
 260
 261         temp = agp_bridge->current_size;
 262
 263         switch (agp_bridge->driver->size_type) {
 264         case U8_APER_SIZE:
 265                 num_entries = A_SIZE_8(temp)->num_entries;
 266                 break;
 267         case U16_APER_SIZE:
 268                 num_entries = A_SIZE_16(temp)->num_entries;
 269                 break;
 270         case U32_APER_SIZE:
 271                 num_entries = A_SIZE_32(temp)->num_entries;
 272                 break;
 273         case LVL2_APER_SIZE:
 274                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 275                 break;
 276         case FIXED_APER_SIZE:
 277                 num_entries = A_SIZE_FIX(temp)->num_entries;
 278                 break;
 279         default:
 280                 num_entries = 0;
 281                 break;
 282         }
 283
 284         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 285         if (num_entries<0)
 286                 num_entries = 0;
 287         return num_entries;
 288 }
 289 EXPORT_SYMBOL_GPL(agp_num_entries);
 290
 291
 292 /**
 293  *      agp_copy_info  -  copy bridge state information
 294  *
 295  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 296  *
 297  *      This function copies information about the agp bridge device and the state of
 298  *      the agp backend into an agp_kern_info pointer.
 299  */
 300 int agp_copy_info(struct agp_kern_info *info)
 301 {
 302         memset(info, 0, sizeof(struct agp_kern_info));
 303         if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
 304             !agp_bridge->version) {
 305                 info->chipset = NOT_SUPPORTED;
 306                 return -EIO;
 307         }
 308
 309         info->version.major = agp_bridge->version->major;
 310         info->version.minor = agp_bridge->version->minor;
 311         info->chipset = agp_bridge->type;
 312         info->device = agp_bridge->dev;
 313         info->mode = agp_bridge->mode;
 314         info->aper_base = agp_bridge->gart_bus_addr;
 315         info->aper_size = agp_return_size();
 316         info->max_memory = agp_bridge->max_memory_agp;
 317         info->current_memory = atomic_read(&agp_bridge->current_memory_agp);
 318         info->cant_use_aperture = agp_bridge->driver->cant_use_aperture;
 319         info->vm_ops = agp_bridge->vm_ops;
 320         info->page_mask = ~0UL;
 321         return 0;
 322 }
 323 EXPORT_SYMBOL(agp_copy_info);
 324
 325
 326 /* End - Routine to copy over information structure */
 327
 328
 329 /*
 330  * Routines for handling swapping of agp_memory into the GATT -
 331  * These routines take agp_memory and insert them into the GATT.
 332  * They call device specific routines to actually write to the GATT.
 333  */
 334
 335 /**
 336  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 337  *
 338  *      @curr:          agp_memory pointer
 339  *      @pg_start:      an offset into the graphics aperture translation table
 340  *
 341  *      It returns -EINVAL if the pointer == NULL.
 342  *      It returns -EBUSY if the area of the table requested is already in use.
 343  */
 344 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 345 {
 346         int ret_val;
 347
 348         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 349                 return -EINVAL;
 350
 351         if (curr->is_bound == TRUE) {
 352                 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
 353                 return -EINVAL;
 354         }
 355         if (curr->is_flushed == FALSE) {
 356                 agp_bridge->driver->cache_flush();
 357                 curr->is_flushed = TRUE;
 358         }
 359         ret_val = agp_bridge->driver->insert_memory(curr, pg_start, curr->type);
 360
 361         if (ret_val != 0)
 362                 return ret_val;
 363
 364         curr->is_bound = TRUE;
 365         curr->pg_start = pg_start;
 366         return 0;
 367 }
 368 EXPORT_SYMBOL(agp_bind_memory);
 369
 370
 371 /**
 372  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 373  *
 374  * @curr:       agp_memory pointer to be removed from the GATT.
 375  *
 376  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 377  * the graphics aperture translation table or if the agp_memory pointer == NULL
 378  */
 379 int agp_unbind_memory(struct agp_memory *curr)
 380 {
 381         int ret_val;
 382
 383         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 384                 return -EINVAL;
 385
 386         if (curr->is_bound != TRUE) {
 387                 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
 388                 return -EINVAL;
 389         }
 390
 391         ret_val = agp_bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 392
 393         if (ret_val != 0)
 394                 return ret_val;
 395
 396         curr->is_bound = FALSE;
 397         curr->pg_start = 0;
 398         return 0;
 399 }
 400 EXPORT_SYMBOL(agp_unbind_memory);
 401
 402 /* End - Routines for handling swapping of agp_memory into the GATT */
 403
 404
 405 /* Generic Agp routines - Start */
 406 static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 407 {
 408         /* disable SBA if it's not supported */
 409         if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
 410                 *cmd &= ~AGPSTAT_SBA;
 411
 412         /* Set speed */
 413         if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
 414                 *cmd &= ~AGPSTAT2_4X;
 415
 416         if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
 417                 *cmd &= ~AGPSTAT2_2X;
 418
 419         if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
 420                 *cmd &= ~AGPSTAT2_1X;
 421
 422         /* Now we know what mode it should be, clear out the unwanted bits. */
 423         if (*cmd & AGPSTAT2_4X)
 424                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X);   /* 4X */
 425
 426         if (*cmd & AGPSTAT2_2X)
 427                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X);   /* 2X */
 428
 429         if (*cmd & AGPSTAT2_1X)
 430                 *cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X);   /* 1X */
 431 }
 432
 433 /*
 434  * mode = requested mode.
 435  * cmd = PCI_AGP_STATUS from agp bridge.
 436  * tmp = PCI_AGP_STATUS from graphic card.
 437  */
 438 static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 439 {
 440         u32 origcmd=*cmd, origtmp=*tmp;
 441
 442         /* ARQSZ - Set the value to the maximum one.
 443          * Don't allow the mode register to override values. */
 444         *cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
 445                 max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
 446
 447         /* Calibration cycle.
 448          * Don't allow the mode register to override values. */
 449         *cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
 450                 min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
 451
 452         /* SBA *must* be supported for AGP v3 */
 453         *cmd |= AGPSTAT_SBA;
 454
 455         /*
 456          * Set speed.
 457          * Check for invalid speeds. This can happen when applications
 458          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 459          */
 460         if (*mode & AGPSTAT_MODE_3_0) {
 461                 /*
 462                  * Caller hasn't a clue what its doing. We are in 3.0 mode,
 463                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 464                  * AGP2.x 4x -> AGP3.0 4x.
 465                  */
 466                 if (*mode & AGPSTAT2_4X) {
 467                         printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 468                                                 current->comm, *mode);
 469                         *mode &= ~AGPSTAT2_4X;
 470                         *mode |= AGPSTAT3_4X;
 471                 }
 472         } else {
 473                 /*
 474                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 475                  * but have been passed an AGP 2.x mode.
 476                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 477                  */
 478                 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 479                                         current->comm, *mode);
 480                 *mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 481                 *mode |= AGPSTAT3_4X;
 482         }
 483
 484         if (*mode & AGPSTAT3_8X) {
 485                 if (!(*cmd & AGPSTAT3_8X)) {
 486                         *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 487                         *cmd |= AGPSTAT3_4X;
 488                         printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
 489                         return;
 490                 }
 491                 if (!(*tmp & AGPSTAT3_8X)) {
 492                         *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 493                         *cmd |= AGPSTAT3_4X;
 494                         printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
 495                         return;
 496                 }
 497                 /* All set, bridge & device can do AGP x8*/
 498                 *cmd &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 499                 return;
 500
 501         } else {
 502
 503                 /*
 504                  * If we didn't specify AGPx8, we can only do x4.
 505                  * If the hardware can't do x4, we're up shit creek, and never
 506                  *  should have got this far.
 507                  */
 508                 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 509                 if ((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X))
 510                         *cmd |= AGPSTAT3_4X;
 511                 else {
 512                         printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 513                                                         "[cmd:%x tmp:%x fell back to:- cmd:%x tmp:%x]\n",
 514                                                         origcmd, origtmp, *cmd, *tmp);
 515                         if (!(*cmd & AGPSTAT3_4X))
 516                                 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 517                         if (!(*tmp & AGPSTAT3_4X))
 518                                 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 519                 }
 520         }
 521 }
 522
 523 //FIXME: This doesn't smell right.
 524 //We need a function we pass an agp_device to.
 525 u32 agp_collect_device_status(u32 mode, u32 cmd)
 526 {
 527         struct pci_dev *device = NULL;
 528         u8 cap_ptr;
 529         u32 tmp;
 530         u32 agp3;
 531
 532         for_each_pci_dev(device) {
 533                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 534                 if (!cap_ptr)
 535                         continue;
 536
 537                 //FIXME: We should probably skip anything here that
 538                 // isn't an AGP graphic card.
 539                 /*
 540                  * Ok, here we have a AGP device. Disable impossible
 541                  * settings, and adjust the readqueue to the minimum.
 542                  */
 543                 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
 544
 545                 /* adjust RQ depth */
 546                 cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
 547                      min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
 548                          min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
 549
 550                 /* disable FW if it's not supported */
 551                 if (!((cmd & AGPSTAT_FW) && (tmp & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
 552                         cmd &= ~AGPSTAT_FW;
 553
 554                 /* Check to see if we are operating in 3.0 mode */
 555                 pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
 556                 if (agp3 & AGPSTAT_MODE_3_0) {
 557                         agp_v3_parse_one(&mode, &cmd, &tmp);
 558                 } else {
 559                         agp_v2_parse_one(&mode, &cmd, &tmp);
 560                 }
 561         }
 562         return cmd;
 563 }
 564 EXPORT_SYMBOL(agp_collect_device_status);
 565
 566
 567 void agp_device_command(u32 command, int agp_v3)
 568 {
 569         struct pci_dev *device = NULL;
 570         int mode;
 571
 572         mode = command & 0x7;
 573         if (agp_v3)
 574                 mode *= 4;
 575
 576         for_each_pci_dev(device) {
 577                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 578                 if (!agp)
 579                         continue;
 580
 581                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 582                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 583                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, command);
 584         }
 585 }
 586 EXPORT_SYMBOL(agp_device_command);
 587
 588
 589 void get_agp_version(struct agp_bridge_data *bridge)
 590 {
 591         u32 ncapid;
 592
 593         /* Exit early if already set by errata workarounds. */
 594         if (agp_bridge->major_version != 0)
 595                 return;
 596
 597         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
 598         agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 599         agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 600 }
 601 EXPORT_SYMBOL(get_agp_version);
 602
 603
 604 void agp_generic_enable(u32 mode)
 605 {
 606         u32 command, temp;
 607         u32 agp3;
 608
 609         get_agp_version(agp_bridge);
 610
 611         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 612                                 agp_bridge->major_version,
 613                                 agp_bridge->minor_version,
 614                                 agp_bridge->dev->slot_name);
 615
 616         pci_read_config_dword(agp_bridge->dev,
 617                       agp_bridge->capndx + PCI_AGP_STATUS, &command);
 618
 619         command = agp_collect_device_status(mode, command);
 620         command |= AGPSTAT_AGP_ENABLE;
 621
 622         /* Do AGP version specific frobbing. */
 623         if(agp_bridge->major_version >= 3) {
 624                 pci_read_config_dword(agp_bridge->dev,
 625                         agp_bridge->capndx+AGPSTAT, &agp3);
 626
 627                 /* Check to see if we are operating in 3.0 mode */
 628                 if (agp3 & AGPSTAT_MODE_3_0) {
 629                         /* If we have 3.5, we can do the isoch stuff. */
 630                         if (agp_bridge->minor_version >= 5)
 631                                 agp_3_5_enable(agp_bridge);
 632                         agp_device_command(command, TRUE);
 633                         return;
 634                 } else {
 635                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 636                     command &= ~(7<<10) ;
 637                     pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
 638                     temp |= (1<<9);
 639                     pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp);
 640
 641                     printk (KERN_INFO PFX "Device is in legacy mode,"
 642                                 " falling back to 2.x\n");
 643                 }
 644         }
 645
 646         /* AGP v<3 */
 647         agp_device_command(command, FALSE);
 648 }
 649 EXPORT_SYMBOL(agp_generic_enable);
 650
 651
 652 int agp_generic_create_gatt_table(void)
 653 {
 654         char *table;
 655         char *table_end;
 656         int size;
 657         int page_order;
 658         int num_entries;
 659         int i;
 660         void *temp;
 661         struct page *page;
 662
 663         /* The generic routines can't handle 2 level gatt's */
 664         if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
 665                 return -EINVAL;
 666
 667         table = NULL;
 668         i = agp_bridge->aperture_size_idx;
 669         temp = agp_bridge->current_size;
 670         size = page_order = num_entries = 0;
 671
 672         if (agp_bridge->driver->size_type != FIXED_APER_SIZE) {
 673                 do {
 674                         switch (agp_bridge->driver->size_type) {
 675                         case U8_APER_SIZE:
 676                                 size = A_SIZE_8(temp)->size;
 677                                 page_order =
 678                                     A_SIZE_8(temp)->page_order;
 679                                 num_entries =
 680                                     A_SIZE_8(temp)->num_entries;
 681                                 break;
 682                         case U16_APER_SIZE:
 683                                 size = A_SIZE_16(temp)->size;
 684                                 page_order = A_SIZE_16(temp)->page_order;
 685                                 num_entries = A_SIZE_16(temp)->num_entries;
 686                                 break;
 687                         case U32_APER_SIZE:
 688                                 size = A_SIZE_32(temp)->size;
 689                                 page_order = A_SIZE_32(temp)->page_order;
 690                                 num_entries = A_SIZE_32(temp)->num_entries;
 691                                 break;
 692                                 /* This case will never really happen. */
 693                         case FIXED_APER_SIZE:
 694                         case LVL2_APER_SIZE:
 695                         default:
 696                                 size = page_order = num_entries = 0;
 697                                 break;
 698                         }
 699
 700                         table = (char *) __get_free_pages(GFP_KERNEL,
 701                                                           page_order);
 702
 703                         if (table == NULL) {
 704                                 i++;
 705                                 switch (agp_bridge->driver->size_type) {
 706                                 case U8_APER_SIZE:
 707                                         agp_bridge->current_size = A_IDX8(agp_bridge);
 708                                         break;
 709                                 case U16_APER_SIZE:
 710                                         agp_bridge->current_size = A_IDX16(agp_bridge);
 711                                         break;
 712                                 case U32_APER_SIZE:
 713                                         agp_bridge->current_size = A_IDX32(agp_bridge);
 714                                         break;
 715                                         /* This case will never really happen. */
 716                                 case FIXED_APER_SIZE:
 717                                 case LVL2_APER_SIZE:
 718                                 default:
 719                                         agp_bridge->current_size =
 720                                             agp_bridge->current_size;
 721                                         break;
 722                                 }
 723                                 temp = agp_bridge->current_size;
 724                         } else {
 725                                 agp_bridge->aperture_size_idx = i;
 726                         }
 727                 } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
 728         } else {
 729                 size = ((struct aper_size_info_fixed *) temp)->size;
 730                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 731                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 732                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 733         }
 734
 735         if (table == NULL)
 736                 return -ENOMEM;
 737
 738         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 739
 740         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 741                 SetPageReserved(page);
 742
 743         agp_bridge->gatt_table_real = (u32 *) table;
 744         agp_gatt_table = (void *)table;
 745
 746         agp_bridge->driver->cache_flush();
 747         agp_bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 748                                         (PAGE_SIZE * (1 << page_order)));
 749         agp_bridge->driver->cache_flush();
 750
 751         if (agp_bridge->gatt_table == NULL) {
 752                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 753                         ClearPageReserved(page);
 754
 755                 free_pages((unsigned long) table, page_order);
 756
 757                 return -ENOMEM;
 758         }
 759         agp_bridge->gatt_bus_addr = virt_to_phys(agp_bridge->gatt_table_real);
 760
 761         /* AK: bogus, should encode addresses > 4GB */
 762         for (i = 0; i < num_entries; i++) {
 763                 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
 764                 readl(agp_bridge->gatt_table+i);        /* PCI Posting. */
 765         }
 766
 767         return 0;
 768 }
 769 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 770
 771 int agp_generic_free_gatt_table(void)
 772 {
 773         int page_order;
 774         char *table, *table_end;
 775         void *temp;
 776         struct page *page;
 777
 778         temp = agp_bridge->current_size;
 779
 780         switch (agp_bridge->driver->size_type) {
 781         case U8_APER_SIZE:
 782                 page_order = A_SIZE_8(temp)->page_order;
 783                 break;
 784         case U16_APER_SIZE:
 785                 page_order = A_SIZE_16(temp)->page_order;
 786                 break;
 787         case U32_APER_SIZE:
 788                 page_order = A_SIZE_32(temp)->page_order;
 789                 break;
 790         case FIXED_APER_SIZE:
 791                 page_order = A_SIZE_FIX(temp)->page_order;
 792                 break;
 793         case LVL2_APER_SIZE:
 794                 /* The generic routines can't deal with 2 level gatt's */
 795                 return -EINVAL;
 796                 break;
 797         default:
 798                 page_order = 0;
 799                 break;
 800         }
 801
 802         /* Do not worry about freeing memory, because if this is
 803          * called, then all agp memory is deallocated and removed
 804          * from the table. */
 805
 806         iounmap(agp_bridge->gatt_table);
 807         table = (char *) agp_bridge->gatt_table_real;
 808         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 809
 810         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 811                 ClearPageReserved(page);
 812
 813         free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
 814
 815         agp_gatt_table = NULL;
 816         agp_bridge->gatt_table = NULL;
 817         agp_bridge->gatt_table_real = NULL;
 818         agp_bridge->gatt_bus_addr = 0;
 819
 820         return 0;
 821 }
 822 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 823
 824
 825 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 826 {
 827         int num_entries;
 828         size_t i;
 829         off_t j;
 830         void *temp;
 831
 832         temp = agp_bridge->current_size;
 833
 834         switch (agp_bridge->driver->size_type) {
 835         case U8_APER_SIZE:
 836                 num_entries = A_SIZE_8(temp)->num_entries;
 837                 break;
 838         case U16_APER_SIZE:
 839                 num_entries = A_SIZE_16(temp)->num_entries;
 840                 break;
 841         case U32_APER_SIZE:
 842                 num_entries = A_SIZE_32(temp)->num_entries;
 843                 break;
 844         case FIXED_APER_SIZE:
 845                 num_entries = A_SIZE_FIX(temp)->num_entries;
 846                 break;
 847         case LVL2_APER_SIZE:
 848                 /* The generic routines can't deal with 2 level gatt's */
 849                 return -EINVAL;
 850                 break;
 851         default:
 852                 num_entries = 0;
 853                 break;
 854         }
 855
 856         num_entries -= agp_memory_reserved/PAGE_SIZE;
 857         if (num_entries < 0) num_entries = 0;
 858
 859         if (type != 0 || mem->type != 0) {
 860                 /* The generic routines know nothing of memory types */
 861                 return -EINVAL;
 862         }
 863
 864         /* AK: could wrap */
 865         if ((pg_start + mem->page_count) > num_entries)
 866                 return -EINVAL;
 867
 868         j = pg_start;
 869
 870         while (j < (pg_start + mem->page_count)) {
 871                 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
 872                         return -EBUSY;
 873                 j++;
 874         }
 875
 876         if (mem->is_flushed == FALSE) {
 877                 agp_bridge->driver->cache_flush();
 878                 mem->is_flushed = TRUE;
 879         }
 880
 881         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 882                 writel(agp_bridge->driver->mask_memory(mem->memory[i], mem->type), agp_bridge->gatt_table+j);
 883                 readl(agp_bridge->gatt_table+j);        /* PCI Posting. */
 884         }
 885
 886         agp_bridge->driver->tlb_flush(mem);
 887         return 0;
 888 }
 889 EXPORT_SYMBOL(agp_generic_insert_memory);
 890
 891
 892 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 893 {
 894         size_t i;
 895
 896         if (type != 0 || mem->type != 0) {
 897                 /* The generic routines know nothing of memory types */
 898                 return -EINVAL;
 899         }
 900
 901         /* AK: bogus, should encode addresses > 4GB */
 902         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 903                 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
 904                 readl(agp_bridge->gatt_table+i);        /* PCI Posting. */
 905         }
 906
 907         global_cache_flush();
 908         agp_bridge->driver->tlb_flush(mem);
 909         return 0;
 910 }
 911 EXPORT_SYMBOL(agp_generic_remove_memory);
 912
 913
 914 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
 915 {
 916         return NULL;
 917 }
 918 EXPORT_SYMBOL(agp_generic_alloc_by_type);
 919
 920
 921 void agp_generic_free_by_type(struct agp_memory *curr)
 922 {
 923         if (curr->memory != NULL)
 924                 vfree(curr->memory);
 925
 926         agp_free_key(curr->key);
 927         kfree(curr);
 928 }
 929 EXPORT_SYMBOL(agp_generic_free_by_type);
 930
 931
 932 /*
 933  * Basic Page Allocation Routines -
 934  * These routines handle page allocation and by default they reserve the allocated
 935  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
 936  * against a maximum value.
 937  */
 938
 939 void *agp_generic_alloc_page(void)
 940 {
 941         struct page * page;
 942
 943         page = alloc_page(GFP_KERNEL);
 944         if (page == NULL)
 945                 return NULL;
 946
 947         map_page_into_agp(page);
 948
 949         get_page(page);
 950         SetPageLocked(page);
 951         atomic_inc(&agp_bridge->current_memory_agp);
 952         return page_address(page);
 953 }
 954 EXPORT_SYMBOL(agp_generic_alloc_page);
 955
 956
 957 void agp_generic_destroy_page(void *addr)
 958 {
 959         struct page *page;
 960
 961         if (addr == NULL)
 962                 return;
 963
 964         page = virt_to_page(addr);
 965         unmap_page_from_agp(page);
 966         put_page(page);
 967         unlock_page(page);
 968         free_page((unsigned long)addr);
 969         atomic_dec(&agp_bridge->current_memory_agp);
 970 }
 971 EXPORT_SYMBOL(agp_generic_destroy_page);
 972
 973 /* End Basic Page Allocation Routines */
 974
 975
 976 /**
 977  * agp_enable  -  initialise the agp point-to-point connection.
 978  *
 979  * @mode:       agp mode register value to configure with.
 980  */
 981 void agp_enable(u32 mode)
 982 {
 983         if (agp_bridge->type == NOT_SUPPORTED)
 984                 return;
 985         agp_bridge->driver->agp_enable(mode);
 986 }
 987 EXPORT_SYMBOL(agp_enable);
 988
 989
 990 static void ipi_handler(void *null)
 991 {
 992         flush_agp_cache();
 993 }
 994
 995 void global_cache_flush(void)
 996 {
 997         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
 998                 panic(PFX "timed out waiting for the other CPUs!\n");
 999 }
1000 EXPORT_SYMBOL(global_cache_flush);
1001
1002 unsigned long agp_generic_mask_memory(unsigned long addr, int type)
1003 {
1004         /* memory type is ignored in the generic routine */
1005         if (agp_bridge->driver->masks)
1006                 return addr | agp_bridge->driver->masks[0].mask;
1007         else
1008                 return addr;
1009 }
1010 EXPORT_SYMBOL(agp_generic_mask_memory);
1011
1012 /*
1013  * These functions are implemented according to the AGPv3 spec,
1014  * which covers implementation details that had previously been
1015  * left open.
1016  */
1017
1018 int agp3_generic_fetch_size(void)
1019 {
1020         u16 temp_size;
1021         int i;
1022         struct aper_size_info_16 *values;
1023
1024         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1025         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1026
1027         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1028                 if (temp_size == values[i].size_value) {
1029                         agp_bridge->previous_size =
1030                                 agp_bridge->current_size = (void *) (values + i);
1031
1032                         agp_bridge->aperture_size_idx = i;
1033                         return values[i].size;
1034                 }
1035         }
1036         return 0;
1037 }
1038 EXPORT_SYMBOL(agp3_generic_fetch_size);
1039
1040 void agp3_generic_tlbflush(struct agp_memory *mem)
1041 {
1042         u32 ctrl;
1043         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1044         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1045         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1046 }
1047 EXPORT_SYMBOL(agp3_generic_tlbflush);
1048
1049 int agp3_generic_configure(void)
1050 {
1051         u32 temp;
1052         struct aper_size_info_16 *current_size;
1053
1054         current_size = A_SIZE_16(agp_bridge->current_size);
1055
1056         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1057         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1058
1059         /* set aperture size */
1060         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1061         /* set gart pointer */
1062         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1063         /* enable aperture and GTLB */
1064         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1065         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1066         return 0;
1067 }
1068 EXPORT_SYMBOL(agp3_generic_configure);
1069
1070 void agp3_generic_cleanup(void)
1071 {
1072         u32 ctrl;
1073         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1074         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1075 }
1076 EXPORT_SYMBOL(agp3_generic_cleanup);
1077
1078 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1079 {
1080         {4096, 1048576, 10,0x000},
1081         {2048,  524288, 9, 0x800},
1082         {1024,  262144, 8, 0xc00},
1083         { 512,  131072, 7, 0xe00},
1084         { 256,   65536, 6, 0xf00},
1085         { 128,   32768, 5, 0xf20},
1086         {  64,   16384, 4, 0xf30},
1087         {  32,    8192, 3, 0xf38},
1088         {  16,    4096, 2, 0xf3c},
1089         {   8,    2048, 1, 0xf3e},
1090         {   4,    1024, 0, 0xf3f}
1091 };
1092 EXPORT_SYMBOL(agp3_generic_sizes);
1093