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