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   1 /*
   2  * For documentation on the i460 AGP interface, see Chapter 7 (AGP Subsystem) of
   3  * the "Intel 460GTX Chipset Software Developer's Manual":
   4  * http://developer.intel.com/design/itanium/downloads/24870401s.htm
   5  */
   6 /*
   7  * 460GX support by Chris Ahna <christopher.j.ahna@intel.com>
   8  * Clean up & simplification by David Mosberger-Tang <davidm@hpl.hp.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/pci.h>
  12 #include <linux/init.h>
  13 #include <linux/string.h>
  14 #include <linux/slab.h>
  15 #include <linux/agp_backend.h>
  16 #include <linux/log2.h>
  17
  18 #include "agp.h"
  19
  20 #define INTEL_I460_BAPBASE              0x98
  21 #define INTEL_I460_GXBCTL               0xa0
  22 #define INTEL_I460_AGPSIZ               0xa2
  23 #define INTEL_I460_ATTBASE              0xfe200000
  24 #define INTEL_I460_GATT_VALID           (1UL << 24)
  25 #define INTEL_I460_GATT_COHERENT        (1UL << 25)
  26
  27 /*
  28  * The i460 can operate with large (4MB) pages, but there is no sane way to support this
  29  * within the current kernel/DRM environment, so we disable the relevant code for now.
  30  * See also comments in ia64_alloc_page()...
  31  */
  32 #define I460_LARGE_IO_PAGES             0
  33
  34 #if I460_LARGE_IO_PAGES
  35 # define I460_IO_PAGE_SHIFT             i460.io_page_shift
  36 #else
  37 # define I460_IO_PAGE_SHIFT             12
  38 #endif
  39
  40 #define I460_IOPAGES_PER_KPAGE          (PAGE_SIZE >> I460_IO_PAGE_SHIFT)
  41 #define I460_KPAGES_PER_IOPAGE          (1 << (I460_IO_PAGE_SHIFT - PAGE_SHIFT))
  42 #define I460_SRAM_IO_DISABLE            (1 << 4)
  43 #define I460_BAPBASE_ENABLE             (1 << 3)
  44 #define I460_AGPSIZ_MASK                0x7
  45 #define I460_4M_PS                      (1 << 1)
  46
  47 /* Control bits for Out-Of-GART coherency and Burst Write Combining */
  48 #define I460_GXBCTL_OOG         (1UL << 0)
  49 #define I460_GXBCTL_BWC         (1UL << 2)
  50
  51 /*
  52  * gatt_table entries are 32-bits wide on the i460; the generic code ought to declare the
  53  * gatt_table and gatt_table_real pointers a "void *"...
  54  */
  55 #define RD_GATT(index)          readl((u32 *) i460.gatt + (index))
  56 #define WR_GATT(index, val)     writel((val), (u32 *) i460.gatt + (index))
  57 /*
  58  * The 460 spec says we have to read the last location written to make sure that all
  59  * writes have taken effect
  60  */
  61 #define WR_FLUSH_GATT(index)    RD_GATT(index)
  62
  63 static struct {
  64         void *gatt;                             /* ioremap'd GATT area */
  65
  66         /* i460 supports multiple GART page sizes, so GART pageshift is dynamic: */
  67         u8 io_page_shift;
  68
  69         /* BIOS configures chipset to one of 2 possible apbase values: */
  70         u8 dynamic_apbase;
  71
  72         /* structure for tracking partial use of 4MB GART pages: */
  73         struct lp_desc {
  74                 unsigned long *alloced_map;     /* bitmap of kernel-pages in use */
  75                 int refcount;                   /* number of kernel pages using the large page */
  76                 u64 paddr;                      /* physical address of large page */
  77         } *lp_desc;
  78 } i460;
  79
  80 static const struct aper_size_info_8 i460_sizes[3] =
  81 {
  82         /*
  83          * The 32GB aperture is only available with a 4M GART page size.  Due to the
  84          * dynamic GART page size, we can't figure out page_order or num_entries until
  85          * runtime.
  86          */
  87         {32768, 0, 0, 4},
  88         {1024, 0, 0, 2},
  89         {256, 0, 0, 1}
  90 };
  91
  92 static struct gatt_mask i460_masks[] =
  93 {
  94         {
  95           .mask = INTEL_I460_GATT_VALID | INTEL_I460_GATT_COHERENT,
  96           .type = 0
  97         }
  98 };
  99
 100 static int i460_fetch_size (void)
 101 {
 102         int i;
 103         u8 temp;
 104         struct aper_size_info_8 *values;
 105
 106         /* Determine the GART page size */
 107         pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &temp);
 108         i460.io_page_shift = (temp & I460_4M_PS) ? 22 : 12;
 109         pr_debug("i460_fetch_size: io_page_shift=%d\n", i460.io_page_shift);
 110
 111         if (i460.io_page_shift != I460_IO_PAGE_SHIFT) {
 112                 printk(KERN_ERR PFX
 113                         "I/O (GART) page-size %luKB doesn't match expected "
 114                                 "size %luKB\n",
 115                         1UL << (i460.io_page_shift - 10),
 116                         1UL << (I460_IO_PAGE_SHIFT));
 117                 return 0;
 118         }
 119
 120         values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
 121
 122         pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp);
 123
 124         /* Exit now if the IO drivers for the GART SRAMS are turned off */
 125         if (temp & I460_SRAM_IO_DISABLE) {
 126                 printk(KERN_ERR PFX "GART SRAMS disabled on 460GX chipset\n");
 127                 printk(KERN_ERR PFX "AGPGART operation not possible\n");
 128                 return 0;
 129         }
 130
 131         /* Make sure we don't try to create an 2 ^ 23 entry GATT */
 132         if ((i460.io_page_shift == 0) && ((temp & I460_AGPSIZ_MASK) == 4)) {
 133                 printk(KERN_ERR PFX "We can't have a 32GB aperture with 4KB GART pages\n");
 134                 return 0;
 135         }
 136
 137         /* Determine the proper APBASE register */
 138         if (temp & I460_BAPBASE_ENABLE)
 139                 i460.dynamic_apbase = INTEL_I460_BAPBASE;
 140         else
 141                 i460.dynamic_apbase = AGP_APBASE;
 142
 143         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 144                 /*
 145                  * Dynamically calculate the proper num_entries and page_order values for
 146                  * the define aperture sizes. Take care not to shift off the end of
 147                  * values[i].size.
 148                  */
 149                 values[i].num_entries = (values[i].size << 8) >> (I460_IO_PAGE_SHIFT - 12);
 150                 values[i].page_order = ilog2((sizeof(u32)*values[i].num_entries) >> PAGE_SHIFT);
 151         }
 152
 153         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 154                 /* Neglect control bits when matching up size_value */
 155                 if ((temp & I460_AGPSIZ_MASK) == values[i].size_value) {
 156                         agp_bridge->previous_size = agp_bridge->current_size = (void *) (values + i);
 157                         agp_bridge->aperture_size_idx = i;
 158                         return values[i].size;
 159                 }
 160         }
 161
 162         return 0;
 163 }
 164
 165 /* There isn't anything to do here since 460 has no GART TLB. */
 166 static void i460_tlb_flush (struct agp_memory *mem)
 167 {
 168         return;
 169 }
 170
 171 /*
 172  * This utility function is needed to prevent corruption of the control bits
 173  * which are stored along with the aperture size in 460's AGPSIZ register
 174  */
 175 static void i460_write_agpsiz (u8 size_value)
 176 {
 177         u8 temp;
 178
 179         pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp);
 180         pci_write_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ,
 181                               ((temp & ~I460_AGPSIZ_MASK) | size_value));
 182 }
 183
 184 static void i460_cleanup (void)
 185 {
 186         struct aper_size_info_8 *previous_size;
 187
 188         previous_size = A_SIZE_8(agp_bridge->previous_size);
 189         i460_write_agpsiz(previous_size->size_value);
 190
 191         if (I460_IO_PAGE_SHIFT > PAGE_SHIFT)
 192                 kfree(i460.lp_desc);
 193 }
 194
 195 static int i460_configure (void)
 196 {
 197         union {
 198                 u32 small[2];
 199                 u64 large;
 200         } temp;
 201         size_t size;
 202         u8 scratch;
 203         struct aper_size_info_8 *current_size;
 204
 205         temp.large = 0;
 206
 207         current_size = A_SIZE_8(agp_bridge->current_size);
 208         i460_write_agpsiz(current_size->size_value);
 209
 210         /*
 211          * Do the necessary rigmarole to read all eight bytes of APBASE.
 212          * This has to be done since the AGP aperture can be above 4GB on
 213          * 460 based systems.
 214          */
 215         pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase, &(temp.small[0]));
 216         pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase + 4, &(temp.small[1]));
 217
 218         /* Clear BAR control bits */
 219         agp_bridge->gart_bus_addr = temp.large & ~((1UL << 3) - 1);
 220
 221         pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &scratch);
 222         pci_write_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL,
 223                               (scratch & 0x02) | I460_GXBCTL_OOG | I460_GXBCTL_BWC);
 224
 225         /*
 226          * Initialize partial allocation trackers if a GART page is bigger than a kernel
 227          * page.
 228          */
 229         if (I460_IO_PAGE_SHIFT > PAGE_SHIFT) {
 230                 size = current_size->num_entries * sizeof(i460.lp_desc[0]);
 231                 i460.lp_desc = kzalloc(size, GFP_KERNEL);
 232                 if (!i460.lp_desc)
 233                         return -ENOMEM;
 234         }
 235         return 0;
 236 }
 237
 238 static int i460_create_gatt_table (struct agp_bridge_data *bridge)
 239 {
 240         int page_order, num_entries, i;
 241         void *temp;
 242
 243         /*
 244          * Load up the fixed address of the GART SRAMS which hold our GATT table.
 245          */
 246         temp = agp_bridge->current_size;
 247         page_order = A_SIZE_8(temp)->page_order;
 248         num_entries = A_SIZE_8(temp)->num_entries;
 249
 250         i460.gatt = ioremap(INTEL_I460_ATTBASE, PAGE_SIZE << page_order);
 251         if (!i460.gatt) {
 252                 printk(KERN_ERR PFX "ioremap failed\n");
 253                 return -ENOMEM;
 254         }
 255
 256         /* These are no good, the should be removed from the agp_bridge strucure... */
 257         agp_bridge->gatt_table_real = NULL;
 258         agp_bridge->gatt_table = NULL;
 259         agp_bridge->gatt_bus_addr = 0;
 260
 261         for (i = 0; i < num_entries; ++i)
 262                 WR_GATT(i, 0);
 263         WR_FLUSH_GATT(i - 1);
 264         return 0;
 265 }
 266
 267 static int i460_free_gatt_table (struct agp_bridge_data *bridge)
 268 {
 269         int num_entries, i;
 270         void *temp;
 271
 272         temp = agp_bridge->current_size;
 273
 274         num_entries = A_SIZE_8(temp)->num_entries;
 275
 276         for (i = 0; i < num_entries; ++i)
 277                 WR_GATT(i, 0);
 278         WR_FLUSH_GATT(num_entries - 1);
 279
 280         iounmap(i460.gatt);
 281         return 0;
 282 }
 283
 284 /*
 285  * The following functions are called when the I/O (GART) page size is smaller than
 286  * PAGE_SIZE.
 287  */
 288
 289 static int i460_insert_memory_small_io_page (struct agp_memory *mem,
 290                                 off_t pg_start, int type)
 291 {
 292         unsigned long paddr, io_pg_start, io_page_size;
 293         int i, j, k, num_entries;
 294         void *temp;
 295
 296         pr_debug("i460_insert_memory_small_io_page(mem=%p, pg_start=%ld, type=%d, paddr0=0x%lx)\n",
 297                  mem, pg_start, type, mem->memory[0]);
 298
 299         if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
 300                 return -EINVAL;
 301
 302         io_pg_start = I460_IOPAGES_PER_KPAGE * pg_start;
 303
 304         temp = agp_bridge->current_size;
 305         num_entries = A_SIZE_8(temp)->num_entries;
 306
 307         if ((io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count) > num_entries) {
 308                 printk(KERN_ERR PFX "Looks like we're out of AGP memory\n");
 309                 return -EINVAL;
 310         }
 311
 312         j = io_pg_start;
 313         while (j < (io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count)) {
 314                 if (!PGE_EMPTY(agp_bridge, RD_GATT(j))) {
 315                         pr_debug("i460_insert_memory_small_io_page: GATT[%d]=0x%x is busy\n",
 316                                  j, RD_GATT(j));
 317                         return -EBUSY;
 318                 }
 319                 j++;
 320         }
 321
 322         io_page_size = 1UL << I460_IO_PAGE_SHIFT;
 323         for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
 324                 paddr = mem->memory[i];
 325                 for (k = 0; k < I460_IOPAGES_PER_KPAGE; k++, j++, paddr += io_page_size)
 326                         WR_GATT(j, agp_bridge->driver->mask_memory(agp_bridge,
 327                                 paddr, mem->type));
 328         }
 329         WR_FLUSH_GATT(j - 1);
 330         return 0;
 331 }
 332
 333 static int i460_remove_memory_small_io_page(struct agp_memory *mem,
 334                                 off_t pg_start, int type)
 335 {
 336         int i;
 337
 338         pr_debug("i460_remove_memory_small_io_page(mem=%p, pg_start=%ld, type=%d)\n",
 339                  mem, pg_start, type);
 340
 341         pg_start = I460_IOPAGES_PER_KPAGE * pg_start;
 342
 343         for (i = pg_start; i < (pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count); i++)
 344                 WR_GATT(i, 0);
 345         WR_FLUSH_GATT(i - 1);
 346         return 0;
 347 }
 348
 349 #if I460_LARGE_IO_PAGES
 350
 351 /*
 352  * These functions are called when the I/O (GART) page size exceeds PAGE_SIZE.
 353  *
 354  * This situation is interesting since AGP memory allocations that are smaller than a
 355  * single GART page are possible.  The i460.lp_desc array tracks partial allocation of the
 356  * large GART pages to work around this issue.
 357  *
 358  * i460.lp_desc[pg_num].refcount tracks the number of kernel pages in use within GART page
 359  * pg_num.  i460.lp_desc[pg_num].paddr is the physical address of the large page and
 360  * i460.lp_desc[pg_num].alloced_map is a bitmap of kernel pages that are in use (allocated).
 361  */
 362
 363 static int i460_alloc_large_page (struct lp_desc *lp)
 364 {
 365         unsigned long order = I460_IO_PAGE_SHIFT - PAGE_SHIFT;
 366         size_t map_size;
 367         void *lpage;
 368
 369         lpage = (void *) __get_free_pages(GFP_KERNEL, order);
 370         if (!lpage) {
 371                 printk(KERN_ERR PFX "Couldn't alloc 4M GART page...\n");
 372                 return -ENOMEM;
 373         }
 374
 375         map_size = ((I460_KPAGES_PER_IOPAGE + BITS_PER_LONG - 1) & -BITS_PER_LONG)/8;
 376         lp->alloced_map = kzalloc(map_size, GFP_KERNEL);
 377         if (!lp->alloced_map) {
 378                 free_pages((unsigned long) lpage, order);
 379                 printk(KERN_ERR PFX "Out of memory, we're in trouble...\n");
 380                 return -ENOMEM;
 381         }
 382
 383         lp->paddr = virt_to_gart(lpage);
 384         lp->refcount = 0;
 385         atomic_add(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp);
 386         return 0;
 387 }
 388
 389 static void i460_free_large_page (struct lp_desc *lp)
 390 {
 391         kfree(lp->alloced_map);
 392         lp->alloced_map = NULL;
 393
 394         free_pages((unsigned long) gart_to_virt(lp->paddr), I460_IO_PAGE_SHIFT - PAGE_SHIFT);
 395         atomic_sub(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp);
 396 }
 397
 398 static int i460_insert_memory_large_io_page (struct agp_memory *mem,
 399                                 off_t pg_start, int type)
 400 {
 401         int i, start_offset, end_offset, idx, pg, num_entries;
 402         struct lp_desc *start, *end, *lp;
 403         void *temp;
 404
 405         if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES)
 406                 return -EINVAL;
 407
 408         temp = agp_bridge->current_size;
 409         num_entries = A_SIZE_8(temp)->num_entries;
 410
 411         /* Figure out what pg_start means in terms of our large GART pages */
 412         start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE];
 413         end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE];
 414         start_offset = pg_start % I460_KPAGES_PER_IOPAGE;
 415         end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE;
 416
 417         if (end > i460.lp_desc + num_entries) {
 418                 printk(KERN_ERR PFX "Looks like we're out of AGP memory\n");
 419                 return -EINVAL;
 420         }
 421
 422         /* Check if the requested region of the aperture is free */
 423         for (lp = start; lp <= end; ++lp) {
 424                 if (!lp->alloced_map)
 425                         continue;       /* OK, the entire large page is available... */
 426
 427                 for (idx = ((lp == start) ? start_offset : 0);
 428                      idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
 429                      idx++)
 430                 {
 431                         if (test_bit(idx, lp->alloced_map))
 432                                 return -EBUSY;
 433                 }
 434         }
 435
 436         for (lp = start, i = 0; lp <= end; ++lp) {
 437                 if (!lp->alloced_map) {
 438                         /* Allocate new GART pages... */
 439                         if (i460_alloc_large_page(lp) < 0)
 440                                 return -ENOMEM;
 441                         pg = lp - i460.lp_desc;
 442                         WR_GATT(pg, agp_bridge->driver->mask_memory(agp_bridge,
 443                                 lp->paddr, 0));
 444                         WR_FLUSH_GATT(pg);
 445                 }
 446
 447                 for (idx = ((lp == start) ? start_offset : 0);
 448                      idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
 449                      idx++, i++)
 450                 {
 451                         mem->memory[i] = lp->paddr + idx*PAGE_SIZE;
 452                         __set_bit(idx, lp->alloced_map);
 453                         ++lp->refcount;
 454                 }
 455         }
 456         return 0;
 457 }
 458
 459 static int i460_remove_memory_large_io_page (struct agp_memory *mem,
 460                                 off_t pg_start, int type)
 461 {
 462         int i, pg, start_offset, end_offset, idx, num_entries;
 463         struct lp_desc *start, *end, *lp;
 464         void *temp;
 465
 466         temp = agp_bridge->driver->current_size;
 467         num_entries = A_SIZE_8(temp)->num_entries;
 468
 469         /* Figure out what pg_start means in terms of our large GART pages */
 470         start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE];
 471         end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE];
 472         start_offset = pg_start % I460_KPAGES_PER_IOPAGE;
 473         end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE;
 474
 475         for (i = 0, lp = start; lp <= end; ++lp) {
 476                 for (idx = ((lp == start) ? start_offset : 0);
 477                      idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE);
 478                      idx++, i++)
 479                 {
 480                         mem->memory[i] = 0;
 481                         __clear_bit(idx, lp->alloced_map);
 482                         --lp->refcount;
 483                 }
 484
 485                 /* Free GART pages if they are unused */
 486                 if (lp->refcount == 0) {
 487                         pg = lp - i460.lp_desc;
 488                         WR_GATT(pg, 0);
 489                         WR_FLUSH_GATT(pg);
 490                         i460_free_large_page(lp);
 491                 }
 492         }
 493         return 0;
 494 }
 495
 496 /* Wrapper routines to call the approriate {small_io_page,large_io_page} function */
 497
 498 static int i460_insert_memory (struct agp_memory *mem,
 499                                 off_t pg_start, int type)
 500 {
 501         if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
 502                 return i460_insert_memory_small_io_page(mem, pg_start, type);
 503         else
 504                 return i460_insert_memory_large_io_page(mem, pg_start, type);
 505 }
 506
 507 static int i460_remove_memory (struct agp_memory *mem,
 508                                 off_t pg_start, int type)
 509 {
 510         if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
 511                 return i460_remove_memory_small_io_page(mem, pg_start, type);
 512         else
 513                 return i460_remove_memory_large_io_page(mem, pg_start, type);
 514 }
 515
 516 /*
 517  * If the I/O (GART) page size is bigger than the kernel page size, we don't want to
 518  * allocate memory until we know where it is to be bound in the aperture (a
 519  * multi-kernel-page alloc might fit inside of an already allocated GART page).
 520  *
 521  * Let's just hope nobody counts on the allocated AGP memory being there before bind time
 522  * (I don't think current drivers do)...
 523  */
 524 static void *i460_alloc_page (struct agp_bridge_data *bridge)
 525 {
 526         void *page;
 527
 528         if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
 529                 page = agp_generic_alloc_page(agp_bridge);
 530                 global_flush_tlb();
 531         } else
 532                 /* Returning NULL would cause problems */
 533                 /* AK: really dubious code. */
 534                 page = (void *)~0UL;
 535         return page;
 536 }
 537
 538 static void i460_destroy_page (void *page, int flags)
 539 {
 540         if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
 541                 agp_generic_destroy_page(page, flags);
 542                 global_flush_tlb();
 543         }
 544 }
 545
 546 #endif /* I460_LARGE_IO_PAGES */
 547
 548 static unsigned long i460_mask_memory (struct agp_bridge_data *bridge,
 549         unsigned long addr, int type)
 550 {
 551         /* Make sure the returned address is a valid GATT entry */
 552         return bridge->driver->masks[0].mask
 553                 | (((addr & ~((1 << I460_IO_PAGE_SHIFT) - 1)) & 0xfffff000) >> 12);
 554 }
 555
 556 const struct agp_bridge_driver intel_i460_driver = {
 557         .owner                  = THIS_MODULE,
 558         .aperture_sizes         = i460_sizes,
 559         .size_type              = U8_APER_SIZE,
 560         .num_aperture_sizes     = 3,
 561         .configure              = i460_configure,
 562         .fetch_size             = i460_fetch_size,
 563         .cleanup                = i460_cleanup,
 564         .tlb_flush              = i460_tlb_flush,
 565         .mask_memory            = i460_mask_memory,
 566         .masks                  = i460_masks,
 567         .agp_enable             = agp_generic_enable,
 568         .cache_flush            = global_cache_flush,
 569         .create_gatt_table      = i460_create_gatt_table,
 570         .free_gatt_table        = i460_free_gatt_table,
 571 #if I460_LARGE_IO_PAGES
 572         .insert_memory          = i460_insert_memory,
 573         .remove_memory          = i460_remove_memory,
 574         .agp_alloc_page         = i460_alloc_page,
 575         .agp_destroy_page       = i460_destroy_page,
 576 #else
 577         .insert_memory          = i460_insert_memory_small_io_page,
 578         .remove_memory          = i460_remove_memory_small_io_page,
 579         .agp_alloc_page         = agp_generic_alloc_page,
 580         .agp_destroy_page       = agp_generic_destroy_page,
 581 #endif
 582         .alloc_by_type          = agp_generic_alloc_by_type,
 583         .free_by_type           = agp_generic_free_by_type,
 584         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 585         .cant_use_aperture      = 1,
 586 };
 587
 588 static int __devinit agp_intel_i460_probe(struct pci_dev *pdev,
 589                                           const struct pci_device_id *ent)
 590 {
 591         struct agp_bridge_data *bridge;
 592         u8 cap_ptr;
 593
 594         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 595         if (!cap_ptr)
 596                 return -ENODEV;
 597
 598         bridge = agp_alloc_bridge();
 599         if (!bridge)
 600                 return -ENOMEM;
 601
 602         bridge->driver = &intel_i460_driver;
 603         bridge->dev = pdev;
 604         bridge->capndx = cap_ptr;
 605
 606         printk(KERN_INFO PFX "Detected Intel 460GX chipset\n");
 607
 608         pci_set_drvdata(pdev, bridge);
 609         return agp_add_bridge(bridge);
 610 }
 611
 612 static void __devexit agp_intel_i460_remove(struct pci_dev *pdev)
 613 {
 614         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 615
 616         agp_remove_bridge(bridge);
 617         agp_put_bridge(bridge);
 618 }
 619
 620 static struct pci_device_id agp_intel_i460_pci_table[] = {
 621         {
 622         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 623         .class_mask     = ~0,
 624         .vendor         = PCI_VENDOR_ID_INTEL,
 625         .device         = PCI_DEVICE_ID_INTEL_84460GX,
 626         .subvendor      = PCI_ANY_ID,
 627         .subdevice      = PCI_ANY_ID,
 628         },
 629         { }
 630 };
 631
 632 MODULE_DEVICE_TABLE(pci, agp_intel_i460_pci_table);
 633
 634 static struct pci_driver agp_intel_i460_pci_driver = {
 635         .name           = "agpgart-intel-i460",
 636         .id_table       = agp_intel_i460_pci_table,
 637         .probe          = agp_intel_i460_probe,
 638         .remove         = __devexit_p(agp_intel_i460_remove),
 639 };
 640
 641 static int __init agp_intel_i460_init(void)
 642 {
 643         if (agp_off)
 644                 return -EINVAL;
 645         return pci_register_driver(&agp_intel_i460_pci_driver);
 646 }
 647
 648 static void __exit agp_intel_i460_cleanup(void)
 649 {
 650         pci_unregister_driver(&agp_intel_i460_pci_driver);
 651 }
 652
 653 module_init(agp_intel_i460_init);
 654 module_exit(agp_intel_i460_cleanup);
 655
 656 MODULE_AUTHOR("Chris Ahna <Christopher.J.Ahna@intel.com>");
 657 MODULE_LICENSE("GPL and additional rights");