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