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] =
 208                         agp_bridge->driver->mask_memory(virt_to_phys(addr), type);
 209                 new->page_count++;
 210         }
 211
 212         flush_agp_mappings();
 213
 214         return new;
 215 }
 216 EXPORT_SYMBOL(agp_allocate_memory);
 217
 218
 219 /* End - Generic routines for handling agp_memory structures */
 220
 221
 222 static int agp_return_size(void)
 223 {
 224         int current_size;
 225         void *temp;
 226
 227         temp = agp_bridge->current_size;
 228
 229         switch (agp_bridge->driver->size_type) {
 230         case U8_APER_SIZE:
 231                 current_size = A_SIZE_8(temp)->size;
 232                 break;
 233         case U16_APER_SIZE:
 234                 current_size = A_SIZE_16(temp)->size;
 235                 break;
 236         case U32_APER_SIZE:
 237                 current_size = A_SIZE_32(temp)->size;
 238                 break;
 239         case LVL2_APER_SIZE:
 240                 current_size = A_SIZE_LVL2(temp)->size;
 241                 break;
 242         case FIXED_APER_SIZE:
 243                 current_size = A_SIZE_FIX(temp)->size;
 244                 break;
 245         default:
 246                 current_size = 0;
 247                 break;
 248         }
 249
 250         current_size -= (agp_memory_reserved / (1024*1024));
 251         if (current_size <0)
 252                 current_size = 0;
 253         return current_size;
 254 }
 255
 256
 257 int agp_num_entries(void)
 258 {
 259         int num_entries;
 260         void *temp;
 261
 262         temp = agp_bridge->current_size;
 263
 264         switch (agp_bridge->driver->size_type) {
 265         case U8_APER_SIZE:
 266                 num_entries = A_SIZE_8(temp)->num_entries;
 267                 break;
 268         case U16_APER_SIZE:
 269                 num_entries = A_SIZE_16(temp)->num_entries;
 270                 break;
 271         case U32_APER_SIZE:
 272                 num_entries = A_SIZE_32(temp)->num_entries;
 273                 break;
 274         case LVL2_APER_SIZE:
 275                 num_entries = A_SIZE_LVL2(temp)->num_entries;
 276                 break;
 277         case FIXED_APER_SIZE:
 278                 num_entries = A_SIZE_FIX(temp)->num_entries;
 279                 break;
 280         default:
 281                 num_entries = 0;
 282                 break;
 283         }
 284
 285         num_entries -= agp_memory_reserved>>PAGE_SHIFT;
 286         if (num_entries<0)
 287                 num_entries = 0;
 288         return num_entries;
 289 }
 290 EXPORT_SYMBOL_GPL(agp_num_entries);
 291
 292
 293 /**
 294  *      agp_copy_info  -  copy bridge state information
 295  *
 296  *      @info:          agp_kern_info pointer.  The caller should insure that this pointer is valid.
 297  *
 298  *      This function copies information about the agp bridge device and the state of
 299  *      the agp backend into an agp_kern_info pointer.
 300  */
 301 int agp_copy_info(struct agp_kern_info *info)
 302 {
 303         memset(info, 0, sizeof(struct agp_kern_info));
 304         if (!agp_bridge || agp_bridge->type == NOT_SUPPORTED ||
 305             !agp_bridge->version) {
 306                 info->chipset = NOT_SUPPORTED;
 307                 return -EIO;
 308         }
 309
 310         info->version.major = agp_bridge->version->major;
 311         info->version.minor = agp_bridge->version->minor;
 312         info->chipset = agp_bridge->type;
 313         info->device = agp_bridge->dev;
 314         info->mode = agp_bridge->mode;
 315         info->aper_base = agp_bridge->gart_bus_addr;
 316         info->aper_size = agp_return_size();
 317         info->max_memory = agp_bridge->max_memory_agp;
 318         info->current_memory = atomic_read(&agp_bridge->current_memory_agp);
 319         info->cant_use_aperture = agp_bridge->driver->cant_use_aperture;
 320         info->vm_ops = agp_bridge->vm_ops;
 321         info->page_mask = ~0UL;
 322         return 0;
 323 }
 324 EXPORT_SYMBOL(agp_copy_info);
 325
 326
 327 /* End - Routine to copy over information structure */
 328
 329
 330 /*
 331  * Routines for handling swapping of agp_memory into the GATT -
 332  * These routines take agp_memory and insert them into the GATT.
 333  * They call device specific routines to actually write to the GATT.
 334  */
 335
 336 /**
 337  *      agp_bind_memory  -  Bind an agp_memory structure into the GATT.
 338  *
 339  *      @curr:          agp_memory pointer
 340  *      @pg_start:      an offset into the graphics aperture translation table
 341  *
 342  *      It returns -EINVAL if the pointer == NULL.
 343  *      It returns -EBUSY if the area of the table requested is already in use.
 344  */
 345 int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
 346 {
 347         int ret_val;
 348
 349         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 350                 return -EINVAL;
 351
 352         if (curr->is_bound == TRUE) {
 353                 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
 354                 return -EINVAL;
 355         }
 356         if (curr->is_flushed == FALSE) {
 357                 agp_bridge->driver->cache_flush();
 358                 curr->is_flushed = TRUE;
 359         }
 360         ret_val = agp_bridge->driver->insert_memory(curr, pg_start, curr->type);
 361
 362         if (ret_val != 0)
 363                 return ret_val;
 364
 365         curr->is_bound = TRUE;
 366         curr->pg_start = pg_start;
 367         return 0;
 368 }
 369 EXPORT_SYMBOL(agp_bind_memory);
 370
 371
 372 /**
 373  *      agp_unbind_memory  -  Removes an agp_memory structure from the GATT
 374  *
 375  * @curr:       agp_memory pointer to be removed from the GATT.
 376  *
 377  * It returns -EINVAL if this piece of agp_memory is not currently bound to
 378  * the graphics aperture translation table or if the agp_memory pointer == NULL
 379  */
 380 int agp_unbind_memory(struct agp_memory *curr)
 381 {
 382         int ret_val;
 383
 384         if ((agp_bridge->type == NOT_SUPPORTED) || (curr == NULL))
 385                 return -EINVAL;
 386
 387         if (curr->is_bound != TRUE) {
 388                 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
 389                 return -EINVAL;
 390         }
 391
 392         ret_val = agp_bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
 393
 394         if (ret_val != 0)
 395                 return ret_val;
 396
 397         curr->is_bound = FALSE;
 398         curr->pg_start = 0;
 399         return 0;
 400 }
 401 EXPORT_SYMBOL(agp_unbind_memory);
 402
 403 /* End - Routines for handling swapping of agp_memory into the GATT */
 404
 405
 406 /* Generic Agp routines - Start */
 407 static void agp_v2_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 408 {
 409         /* disable SBA if it's not supported */
 410         if (!((*cmd & AGPSTAT_SBA) && (*tmp & AGPSTAT_SBA) && (*mode & AGPSTAT_SBA)))
 411                 *cmd &= ~AGPSTAT_SBA;
 412
 413         /* Set speed */
 414         if (!((*cmd & AGPSTAT2_4X) && (*tmp & AGPSTAT2_4X) && (*mode & AGPSTAT2_4X)))
 415                 *cmd &= ~AGPSTAT2_4X;
 416
 417         if (!((*cmd & AGPSTAT2_2X) && (*tmp & AGPSTAT2_2X) && (*mode & AGPSTAT2_2X)))
 418                 *cmd &= ~AGPSTAT2_2X;
 419
 420         if (!((*cmd & AGPSTAT2_1X) && (*tmp & AGPSTAT2_1X) && (*mode & AGPSTAT2_1X)))
 421                 *cmd &= ~AGPSTAT2_1X;
 422
 423         /* Now we know what mode it should be, clear out the unwanted bits. */
 424         if (*cmd & AGPSTAT2_4X)
 425                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_2X);   /* 4X */
 426
 427         if (*cmd & AGPSTAT2_2X)
 428                 *cmd &= ~(AGPSTAT2_1X | AGPSTAT2_4X);   /* 2X */
 429
 430         if (*cmd & AGPSTAT2_1X)
 431                 *cmd &= ~(AGPSTAT2_2X | AGPSTAT2_4X);   /* 1X */
 432 }
 433
 434 /*
 435  * mode = requested mode.
 436  * cmd = PCI_AGP_STATUS from agp bridge.
 437  * tmp = PCI_AGP_STATUS from graphic card.
 438  */
 439 static void agp_v3_parse_one(u32 *mode, u32 *cmd, u32 *tmp)
 440 {
 441         u32 origcmd=*cmd, origtmp=*tmp;
 442
 443         /* ARQSZ - Set the value to the maximum one.
 444          * Don't allow the mode register to override values. */
 445         *cmd = ((*cmd & ~AGPSTAT_ARQSZ) |
 446                 max_t(u32,(*cmd & AGPSTAT_ARQSZ),(*tmp & AGPSTAT_ARQSZ)));
 447
 448         /* Calibration cycle.
 449          * Don't allow the mode register to override values. */
 450         *cmd = ((*cmd & ~AGPSTAT_CAL_MASK) |
 451                 min_t(u32,(*cmd & AGPSTAT_CAL_MASK),(*tmp & AGPSTAT_CAL_MASK)));
 452
 453         /* SBA *must* be supported for AGP v3 */
 454         *cmd |= AGPSTAT_SBA;
 455
 456         /*
 457          * Set speed.
 458          * Check for invalid speeds. This can happen when applications
 459          * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
 460          */
 461         if (*mode & AGPSTAT_MODE_3_0) {
 462                 /*
 463                  * Caller hasn't a clue what its doing. We are in 3.0 mode,
 464                  * have been passed a 3.0 mode, but with 2.x speed bits set.
 465                  * AGP2.x 4x -> AGP3.0 4x.
 466                  */
 467                 if (*mode & AGPSTAT2_4X) {
 468                         printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
 469                                                 current->comm, *mode);
 470                         *mode &= ~AGPSTAT2_4X;
 471                         *mode |= AGPSTAT3_4X;
 472                 }
 473         } else {
 474                 /*
 475                  * The caller doesn't know what they are doing. We are in 3.0 mode,
 476                  * but have been passed an AGP 2.x mode.
 477                  * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
 478                  */
 479                 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
 480                                         current->comm, *mode);
 481                 *mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
 482                 *mode |= AGPSTAT3_4X;
 483         }
 484
 485         if (*mode & AGPSTAT3_8X) {
 486                 if (!(*cmd & AGPSTAT3_8X)) {
 487                         *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 488                         *cmd |= AGPSTAT3_4X;
 489                         printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
 490                         return;
 491                 }
 492                 if (!(*tmp & AGPSTAT3_8X)) {
 493                         *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 494                         *cmd |= AGPSTAT3_4X;
 495                         printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
 496                         return;
 497                 }
 498                 /* All set, bridge & device can do AGP x8*/
 499                 *cmd &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
 500                 return;
 501
 502         } else {
 503
 504                 /*
 505                  * If we didn't specify AGPx8, we can only do x4.
 506                  * If the hardware can't do x4, we're up shit creek, and never
 507                  *  should have got this far.
 508                  */
 509                 *cmd &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
 510                 if ((*cmd & AGPSTAT3_4X) && (*tmp & AGPSTAT3_4X))
 511                         *cmd |= AGPSTAT3_4X;
 512                 else {
 513                         printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
 514                                                         "[cmd:%x tmp:%x fell back to:- cmd:%x tmp:%x]\n",
 515                                                         origcmd, origtmp, *cmd, *tmp);
 516                         if (!(*cmd & AGPSTAT3_4X))
 517                                 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
 518                         if (!(*tmp & AGPSTAT3_4X))
 519                                 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
 520                 }
 521         }
 522 }
 523
 524 //FIXME: This doesn't smell right.
 525 //We need a function we pass an agp_device to.
 526 u32 agp_collect_device_status(u32 mode, u32 cmd)
 527 {
 528         struct pci_dev *device = NULL;
 529         u8 cap_ptr;
 530         u32 tmp;
 531         u32 agp3;
 532
 533         while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
 534                 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
 535                 if (!cap_ptr)
 536                         continue;
 537
 538                 //FIXME: We should probably skip anything here that
 539                 // isn't an AGP graphic card.
 540                 /*
 541                  * Ok, here we have a AGP device. Disable impossible
 542                  * settings, and adjust the readqueue to the minimum.
 543                  */
 544                 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &tmp);
 545
 546                 /* adjust RQ depth */
 547                 cmd = ((cmd & ~AGPSTAT_RQ_DEPTH) |
 548                      min_t(u32, (mode & AGPSTAT_RQ_DEPTH),
 549                          min_t(u32, (cmd & AGPSTAT_RQ_DEPTH), (tmp & AGPSTAT_RQ_DEPTH))));
 550
 551                 /* disable FW if it's not supported */
 552                 if (!((cmd & AGPSTAT_FW) && (tmp & AGPSTAT_FW) && (mode & AGPSTAT_FW)))
 553                         cmd &= ~AGPSTAT_FW;
 554
 555                 /* Check to see if we are operating in 3.0 mode */
 556                 pci_read_config_dword(device, cap_ptr+AGPSTAT, &agp3);
 557                 if (agp3 & AGPSTAT_MODE_3_0) {
 558                         agp_v3_parse_one(&mode, &cmd, &tmp);
 559                 } else {
 560                         agp_v2_parse_one(&mode, &cmd, &tmp);
 561                 }
 562         }
 563         return cmd;
 564 }
 565 EXPORT_SYMBOL(agp_collect_device_status);
 566
 567
 568 void agp_device_command(u32 command, int agp_v3)
 569 {
 570         struct pci_dev *device = NULL;
 571         int mode;
 572
 573         mode = command & 0x7;
 574         if (agp_v3)
 575                 mode *= 4;
 576
 577         while ((device = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, device)) != NULL) {
 578                 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 579                 if (!agp)
 580                         continue;
 581
 582                 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
 583                                 agp_v3 ? 3 : 2, pci_name(device), mode);
 584                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, command);
 585         }
 586 }
 587 EXPORT_SYMBOL(agp_device_command);
 588
 589
 590 void get_agp_version(struct agp_bridge_data *bridge)
 591 {
 592         u32 ncapid;
 593
 594         /* Exit early if already set by errata workarounds. */
 595         if (agp_bridge->major_version != 0)
 596                 return;
 597
 598         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx, &ncapid);
 599         agp_bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
 600         agp_bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
 601 }
 602 EXPORT_SYMBOL(get_agp_version);
 603
 604
 605 void agp_generic_enable(u32 mode)
 606 {
 607         u32 command, temp;
 608         u32 agp3;
 609
 610         get_agp_version(agp_bridge);
 611
 612         printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
 613                                 agp_bridge->major_version,
 614                                 agp_bridge->minor_version,
 615                                 agp_bridge->dev->slot_name);
 616
 617         pci_read_config_dword(agp_bridge->dev,
 618                       agp_bridge->capndx + PCI_AGP_STATUS, &command);
 619
 620         command = agp_collect_device_status(mode, command);
 621         command |= AGPSTAT_AGP_ENABLE;
 622
 623         /* Do AGP version specific frobbing. */
 624         if(agp_bridge->major_version >= 3) {
 625                 pci_read_config_dword(agp_bridge->dev,
 626                         agp_bridge->capndx+AGPSTAT, &agp3);
 627
 628                 /* Check to see if we are operating in 3.0 mode */
 629                 if (agp3 & AGPSTAT_MODE_3_0) {
 630                         /* If we have 3.5, we can do the isoch stuff. */
 631                         if (agp_bridge->minor_version >= 5)
 632                                 agp_3_5_enable(agp_bridge);
 633                         agp_device_command(command, TRUE);
 634                         return;
 635                 } else {
 636                     /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
 637                     command &= ~(7<<10) ;
 638                     pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
 639                     temp |= (1<<9);
 640                     pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp);
 641
 642                     printk (KERN_INFO PFX "Device is in legacy mode,"
 643                                 " falling back to 2.x\n");
 644                 }
 645         }
 646
 647         /* AGP v<3 */
 648         agp_device_command(command, FALSE);
 649 }
 650 EXPORT_SYMBOL(agp_generic_enable);
 651
 652
 653 int agp_generic_create_gatt_table(void)
 654 {
 655         char *table;
 656         char *table_end;
 657         int size;
 658         int page_order;
 659         int num_entries;
 660         int i;
 661         void *temp;
 662         struct page *page;
 663
 664         /* The generic routines can't handle 2 level gatt's */
 665         if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
 666                 return -EINVAL;
 667
 668         table = NULL;
 669         i = agp_bridge->aperture_size_idx;
 670         temp = agp_bridge->current_size;
 671         size = page_order = num_entries = 0;
 672
 673         if (agp_bridge->driver->size_type != FIXED_APER_SIZE) {
 674                 do {
 675                         switch (agp_bridge->driver->size_type) {
 676                         case U8_APER_SIZE:
 677                                 size = A_SIZE_8(temp)->size;
 678                                 page_order =
 679                                     A_SIZE_8(temp)->page_order;
 680                                 num_entries =
 681                                     A_SIZE_8(temp)->num_entries;
 682                                 break;
 683                         case U16_APER_SIZE:
 684                                 size = A_SIZE_16(temp)->size;
 685                                 page_order = A_SIZE_16(temp)->page_order;
 686                                 num_entries = A_SIZE_16(temp)->num_entries;
 687                                 break;
 688                         case U32_APER_SIZE:
 689                                 size = A_SIZE_32(temp)->size;
 690                                 page_order = A_SIZE_32(temp)->page_order;
 691                                 num_entries = A_SIZE_32(temp)->num_entries;
 692                                 break;
 693                                 /* This case will never really happen. */
 694                         case FIXED_APER_SIZE:
 695                         case LVL2_APER_SIZE:
 696                         default:
 697                                 size = page_order = num_entries = 0;
 698                                 break;
 699                         }
 700
 701                         table = (char *) __get_free_pages(GFP_KERNEL,
 702                                                           page_order);
 703
 704                         if (table == NULL) {
 705                                 i++;
 706                                 switch (agp_bridge->driver->size_type) {
 707                                 case U8_APER_SIZE:
 708                                         agp_bridge->current_size = A_IDX8(agp_bridge);
 709                                         break;
 710                                 case U16_APER_SIZE:
 711                                         agp_bridge->current_size = A_IDX16(agp_bridge);
 712                                         break;
 713                                 case U32_APER_SIZE:
 714                                         agp_bridge->current_size = A_IDX32(agp_bridge);
 715                                         break;
 716                                         /* This case will never really happen. */
 717                                 case FIXED_APER_SIZE:
 718                                 case LVL2_APER_SIZE:
 719                                 default:
 720                                         agp_bridge->current_size =
 721                                             agp_bridge->current_size;
 722                                         break;
 723                                 }
 724                                 temp = agp_bridge->current_size;
 725                         } else {
 726                                 agp_bridge->aperture_size_idx = i;
 727                         }
 728                 } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
 729         } else {
 730                 size = ((struct aper_size_info_fixed *) temp)->size;
 731                 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
 732                 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
 733                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 734         }
 735
 736         if (table == NULL)
 737                 return -ENOMEM;
 738
 739         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 740
 741         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 742                 SetPageReserved(page);
 743
 744         agp_bridge->gatt_table_real = (u32 *) table;
 745         agp_gatt_table = (void *)table;
 746
 747         agp_bridge->driver->cache_flush();
 748         agp_bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
 749                                         (PAGE_SIZE * (1 << page_order)));
 750         agp_bridge->driver->cache_flush();
 751
 752         if (agp_bridge->gatt_table == NULL) {
 753                 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 754                         ClearPageReserved(page);
 755
 756                 free_pages((unsigned long) table, page_order);
 757
 758                 return -ENOMEM;
 759         }
 760         agp_bridge->gatt_bus_addr = virt_to_phys(agp_bridge->gatt_table_real);
 761
 762         /* AK: bogus, should encode addresses > 4GB */
 763         for (i = 0; i < num_entries; i++) {
 764                 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
 765                 readl(agp_bridge->gatt_table+i);        /* PCI Posting. */
 766         }
 767
 768         return 0;
 769 }
 770 EXPORT_SYMBOL(agp_generic_create_gatt_table);
 771
 772 int agp_generic_free_gatt_table(void)
 773 {
 774         int page_order;
 775         char *table, *table_end;
 776         void *temp;
 777         struct page *page;
 778
 779         temp = agp_bridge->current_size;
 780
 781         switch (agp_bridge->driver->size_type) {
 782         case U8_APER_SIZE:
 783                 page_order = A_SIZE_8(temp)->page_order;
 784                 break;
 785         case U16_APER_SIZE:
 786                 page_order = A_SIZE_16(temp)->page_order;
 787                 break;
 788         case U32_APER_SIZE:
 789                 page_order = A_SIZE_32(temp)->page_order;
 790                 break;
 791         case FIXED_APER_SIZE:
 792                 page_order = A_SIZE_FIX(temp)->page_order;
 793                 break;
 794         case LVL2_APER_SIZE:
 795                 /* The generic routines can't deal with 2 level gatt's */
 796                 return -EINVAL;
 797                 break;
 798         default:
 799                 page_order = 0;
 800                 break;
 801         }
 802
 803         /* Do not worry about freeing memory, because if this is
 804          * called, then all agp memory is deallocated and removed
 805          * from the table. */
 806
 807         iounmap(agp_bridge->gatt_table);
 808         table = (char *) agp_bridge->gatt_table_real;
 809         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 810
 811         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 812                 ClearPageReserved(page);
 813
 814         free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
 815
 816         agp_gatt_table = NULL;
 817         agp_bridge->gatt_table = NULL;
 818         agp_bridge->gatt_table_real = NULL;
 819         agp_bridge->gatt_bus_addr = 0;
 820
 821         return 0;
 822 }
 823 EXPORT_SYMBOL(agp_generic_free_gatt_table);
 824
 825
 826 int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
 827 {
 828         int num_entries;
 829         size_t i;
 830         off_t j;
 831         void *temp;
 832
 833         temp = agp_bridge->current_size;
 834
 835         switch (agp_bridge->driver->size_type) {
 836         case U8_APER_SIZE:
 837                 num_entries = A_SIZE_8(temp)->num_entries;
 838                 break;
 839         case U16_APER_SIZE:
 840                 num_entries = A_SIZE_16(temp)->num_entries;
 841                 break;
 842         case U32_APER_SIZE:
 843                 num_entries = A_SIZE_32(temp)->num_entries;
 844                 break;
 845         case FIXED_APER_SIZE:
 846                 num_entries = A_SIZE_FIX(temp)->num_entries;
 847                 break;
 848         case LVL2_APER_SIZE:
 849                 /* The generic routines can't deal with 2 level gatt's */
 850                 return -EINVAL;
 851                 break;
 852         default:
 853                 num_entries = 0;
 854                 break;
 855         }
 856
 857         num_entries -= agp_memory_reserved/PAGE_SIZE;
 858         if (num_entries < 0) num_entries = 0;
 859
 860         if (type != 0 || mem->type != 0) {
 861                 /* The generic routines know nothing of memory types */
 862                 return -EINVAL;
 863         }
 864
 865         /* AK: could wrap */
 866         if ((pg_start + mem->page_count) > num_entries)
 867                 return -EINVAL;
 868
 869         j = pg_start;
 870
 871         while (j < (pg_start + mem->page_count)) {
 872                 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
 873                         return -EBUSY;
 874                 j++;
 875         }
 876
 877         if (mem->is_flushed == FALSE) {
 878                 agp_bridge->driver->cache_flush();
 879                 mem->is_flushed = TRUE;
 880         }
 881
 882         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 883                 writel(agp_bridge->driver->mask_memory(mem->memory[i], mem->type), agp_bridge->gatt_table+j);
 884                 readl(agp_bridge->gatt_table+j);        /* PCI Posting. */
 885         }
 886
 887         agp_bridge->driver->tlb_flush(mem);
 888         return 0;
 889 }
 890 EXPORT_SYMBOL(agp_generic_insert_memory);
 891
 892
 893 int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 894 {
 895         size_t i;
 896
 897         if (type != 0 || mem->type != 0) {
 898                 /* The generic routines know nothing of memory types */
 899                 return -EINVAL;
 900         }
 901
 902         /* AK: bogus, should encode addresses > 4GB */
 903         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 904                 writel(agp_bridge->scratch_page, agp_bridge->gatt_table+i);
 905                 readl(agp_bridge->gatt_table+i);        /* PCI Posting. */
 906         }
 907
 908         global_cache_flush();
 909         agp_bridge->driver->tlb_flush(mem);
 910         return 0;
 911 }
 912 EXPORT_SYMBOL(agp_generic_remove_memory);
 913
 914
 915 struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
 916 {
 917         return NULL;
 918 }
 919 EXPORT_SYMBOL(agp_generic_alloc_by_type);
 920
 921
 922 void agp_generic_free_by_type(struct agp_memory *curr)
 923 {
 924         if (curr->memory != NULL)
 925                 vfree(curr->memory);
 926
 927         agp_free_key(curr->key);
 928         kfree(curr);
 929 }
 930 EXPORT_SYMBOL(agp_generic_free_by_type);
 931
 932
 933 /*
 934  * Basic Page Allocation Routines -
 935  * These routines handle page allocation and by default they reserve the allocated
 936  * memory.  They also handle incrementing the current_memory_agp value, Which is checked
 937  * against a maximum value.
 938  */
 939
 940 void *agp_generic_alloc_page(void)
 941 {
 942         struct page * page;
 943
 944         page = alloc_page(GFP_KERNEL);
 945         if (page == NULL)
 946                 return NULL;
 947
 948         map_page_into_agp(page);
 949
 950         get_page(page);
 951         SetPageLocked(page);
 952         atomic_inc(&agp_bridge->current_memory_agp);
 953         return page_address(page);
 954 }
 955 EXPORT_SYMBOL(agp_generic_alloc_page);
 956
 957
 958 void agp_generic_destroy_page(void *addr)
 959 {
 960         struct page *page;
 961
 962         if (addr == NULL)
 963                 return;
 964
 965         page = virt_to_page(addr);
 966         unmap_page_from_agp(page);
 967         put_page(page);
 968         unlock_page(page);
 969         free_page((unsigned long)addr);
 970         atomic_dec(&agp_bridge->current_memory_agp);
 971 }
 972 EXPORT_SYMBOL(agp_generic_destroy_page);
 973
 974 /* End Basic Page Allocation Routines */
 975
 976
 977 /**
 978  * agp_enable  -  initialise the agp point-to-point connection.
 979  *
 980  * @mode:       agp mode register value to configure with.
 981  */
 982 void agp_enable(u32 mode)
 983 {
 984         if (agp_bridge->type == NOT_SUPPORTED)
 985                 return;
 986         agp_bridge->driver->agp_enable(mode);
 987 }
 988 EXPORT_SYMBOL(agp_enable);
 989
 990
 991 #ifdef CONFIG_SMP
 992 static void ipi_handler(void *null)
 993 {
 994         flush_agp_cache();
 995 }
 996 #endif
 997
 998 void global_cache_flush(void)
 999 {
1000 #ifdef CONFIG_SMP
1001         if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1002                 panic(PFX "timed out waiting for the other CPUs!\n");
1003 #else
1004         flush_agp_cache();
1005 #endif
1006 }
1007 EXPORT_SYMBOL(global_cache_flush);
1008
1009 unsigned long agp_generic_mask_memory(unsigned long addr, int type)
1010 {
1011         /* memory type is ignored in the generic routine */
1012         if (agp_bridge->driver->masks)
1013                 return addr | agp_bridge->driver->masks[0].mask;
1014         else
1015                 return addr;
1016 }
1017 EXPORT_SYMBOL(agp_generic_mask_memory);
1018
1019 /*
1020  * These functions are implemented according to the AGPv3 spec,
1021  * which covers implementation details that had previously been
1022  * left open.
1023  */
1024
1025 int agp3_generic_fetch_size(void)
1026 {
1027         u16 temp_size;
1028         int i;
1029         struct aper_size_info_16 *values;
1030
1031         pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1032         values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1033
1034         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1035                 if (temp_size == values[i].size_value) {
1036                         agp_bridge->previous_size =
1037                                 agp_bridge->current_size = (void *) (values + i);
1038
1039                         agp_bridge->aperture_size_idx = i;
1040                         return values[i].size;
1041                 }
1042         }
1043         return 0;
1044 }
1045 EXPORT_SYMBOL(agp3_generic_fetch_size);
1046
1047 void agp3_generic_tlbflush(struct agp_memory *mem)
1048 {
1049         u32 ctrl;
1050         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1051         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1052         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1053 }
1054 EXPORT_SYMBOL(agp3_generic_tlbflush);
1055
1056 int agp3_generic_configure(void)
1057 {
1058         u32 temp;
1059         struct aper_size_info_16 *current_size;
1060
1061         current_size = A_SIZE_16(agp_bridge->current_size);
1062
1063         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1064         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1065
1066         /* set aperture size */
1067         pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1068         /* set gart pointer */
1069         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1070         /* enable aperture and GTLB */
1071         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1072         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1073         return 0;
1074 }
1075 EXPORT_SYMBOL(agp3_generic_configure);
1076
1077 void agp3_generic_cleanup(void)
1078 {
1079         u32 ctrl;
1080         pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1081         pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1082 }
1083 EXPORT_SYMBOL(agp3_generic_cleanup);
1084
1085 struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1086 {
1087         {4096, 1048576, 10,0x000},
1088         {2048,  524288, 9, 0x800},
1089         {1024,  262144, 8, 0xc00},
1090         { 512,  131072, 7, 0xe00},
1091         { 256,   65536, 6, 0xf00},
1092         { 128,   32768, 5, 0xf20},
1093         {  64,   16384, 4, 0xf30},
1094         {  32,    8192, 3, 0xf38},
1095         {  16,    4096, 2, 0xf3c},
1096         {   8,    2048, 1, 0xf3e},
1097         {   4,    1024, 0, 0xf3f}
1098 };
1099 EXPORT_SYMBOL(agp3_generic_sizes);
1100