drivers/char/agp/uninorth-agp.c

   1 /*
   2  * UniNorth AGPGART routines.
   3  */
   4 #include <linux/module.h>
   5 #include <linux/pci.h>
   6 #include <linux/slab.h>
   7 #include <linux/init.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/agp_backend.h>
  10 #include <linux/delay.h>
  11 #include <linux/vmalloc.h>
  12 #include <asm/uninorth.h>
  13 #include <asm/pci-bridge.h>
  14 #include <asm/prom.h>
  15 #include <asm/pmac_feature.h>
  16 #include "agp.h"
  17
  18 /*
  19  * NOTES for uninorth3 (G5 AGP) supports :
  20  *
  21  * There maybe also possibility to have bigger cache line size for
  22  * agp (see pmac_pci.c and look for cache line). Need to be investigated
  23  * by someone.
  24  *
  25  * PAGE size are hardcoded but this may change, see asm/page.h.
  26  *
  27  * Jerome Glisse <j.glisse@gmail.com>
  28  */
  29 static int uninorth_rev;
  30 static int is_u3;
  31 static u32 scratch_value;
  32
  33 #define DEFAULT_APERTURE_SIZE 256
  34 #define DEFAULT_APERTURE_STRING "256"
  35 static char *aperture = NULL;
  36
  37 static int uninorth_fetch_size(void)
  38 {
  39         int i, size = 0;
  40         struct aper_size_info_32 *values =
  41             A_SIZE_32(agp_bridge->driver->aperture_sizes);
  42
  43         if (aperture) {
  44                 char *save = aperture;
  45
  46                 size = memparse(aperture, &aperture) >> 20;
  47                 aperture = save;
  48
  49                 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
  50                         if (size == values[i].size)
  51                                 break;
  52
  53                 if (i == agp_bridge->driver->num_aperture_sizes) {
  54                         dev_err(&agp_bridge->dev->dev, "invalid aperture size, "
  55                                 "using default\n");
  56                         size = 0;
  57                         aperture = NULL;
  58                 }
  59         }
  60
  61         if (!size) {
  62                 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++)
  63                         if (values[i].size == DEFAULT_APERTURE_SIZE)
  64                                 break;
  65         }
  66
  67         agp_bridge->previous_size =
  68             agp_bridge->current_size = (void *)(values + i);
  69         agp_bridge->aperture_size_idx = i;
  70         return values[i].size;
  71 }
  72
  73 static void uninorth_tlbflush(struct agp_memory *mem)
  74 {
  75         u32 ctrl = UNI_N_CFG_GART_ENABLE;
  76
  77         if (is_u3)
  78                 ctrl |= U3_N_CFG_GART_PERFRD;
  79         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  80                                ctrl | UNI_N_CFG_GART_INVAL);
  81         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, ctrl);
  82
  83         if (uninorth_rev <= 0x30) {
  84                 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  85                                        ctrl | UNI_N_CFG_GART_2xRESET);
  86                 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  87                                        ctrl);
  88         }
  89 }
  90
  91 static void uninorth_cleanup(void)
  92 {
  93         u32 tmp;
  94
  95         pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, &tmp);
  96         if (!(tmp & UNI_N_CFG_GART_ENABLE))
  97                 return;
  98         tmp |= UNI_N_CFG_GART_INVAL;
  99         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, tmp);
 100         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL, 0);
 101
 102         if (uninorth_rev <= 0x30) {
 103                 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
 104                                        UNI_N_CFG_GART_2xRESET);
 105                 pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
 106                                        0);
 107         }
 108 }
 109
 110 static int uninorth_configure(void)
 111 {
 112         struct aper_size_info_32 *current_size;
 113
 114         current_size = A_SIZE_32(agp_bridge->current_size);
 115
 116         dev_info(&agp_bridge->dev->dev, "configuring for size idx: %d\n",
 117                  current_size->size_value);
 118
 119         /* aperture size and gatt addr */
 120         pci_write_config_dword(agp_bridge->dev,
 121                 UNI_N_CFG_GART_BASE,
 122                 (agp_bridge->gatt_bus_addr & 0xfffff000)
 123                         | current_size->size_value);
 124
 125         /* HACK ALERT
 126          * UniNorth seem to be buggy enough not to handle properly when
 127          * the AGP aperture isn't mapped at bus physical address 0
 128          */
 129         agp_bridge->gart_bus_addr = 0;
 130 #ifdef CONFIG_PPC64
 131         /* Assume U3 or later on PPC64 systems */
 132         /* high 4 bits of GART physical address go in UNI_N_CFG_AGP_BASE */
 133         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_AGP_BASE,
 134                                (agp_bridge->gatt_bus_addr >> 32) & 0xf);
 135 #else
 136         pci_write_config_dword(agp_bridge->dev,
 137                 UNI_N_CFG_AGP_BASE, agp_bridge->gart_bus_addr);
 138 #endif
 139
 140         if (is_u3) {
 141                 pci_write_config_dword(agp_bridge->dev,
 142                                        UNI_N_CFG_GART_DUMMY_PAGE,
 143                                        page_to_phys(agp_bridge->scratch_page_page) >> 12);
 144         }
 145
 146         return 0;
 147 }
 148
 149 static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
 150 {
 151         int i, num_entries;
 152         void *temp;
 153         u32 *gp;
 154         int mask_type;
 155
 156         if (type != mem->type)
 157                 return -EINVAL;
 158
 159         mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
 160         if (mask_type != 0) {
 161                 /* We know nothing of memory types */
 162                 return -EINVAL;
 163         }
 164
 165         if (mem->page_count == 0)
 166                 return 0;
 167
 168         temp = agp_bridge->current_size;
 169         num_entries = A_SIZE_32(temp)->num_entries;
 170
 171         if ((pg_start + mem->page_count) > num_entries)
 172                 return -EINVAL;
 173
 174         gp = (u32 *) &agp_bridge->gatt_table[pg_start];
 175         for (i = 0; i < mem->page_count; ++i) {
 176                 if (gp[i] != scratch_value) {
 177                         dev_info(&agp_bridge->dev->dev,
 178                                  "uninorth_insert_memory: entry 0x%x occupied (%x)\n",
 179                                  i, gp[i]);
 180                         return -EBUSY;
 181                 }
 182         }
 183
 184         for (i = 0; i < mem->page_count; i++) {
 185                 if (is_u3)
 186                         gp[i] = (page_to_phys(mem->pages[i]) >> PAGE_SHIFT) | 0x80000000UL;
 187                 else
 188                         gp[i] = cpu_to_le32((page_to_phys(mem->pages[i]) & 0xFFFFF000UL) |
 189                                             0x1UL);
 190                 flush_dcache_range((unsigned long)__va(page_to_phys(mem->pages[i])),
 191                                    (unsigned long)__va(page_to_phys(mem->pages[i]))+0x1000);
 192         }
 193         mb();
 194         uninorth_tlbflush(mem);
 195
 196         return 0;
 197 }
 198
 199 int uninorth_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 200 {
 201         size_t i;
 202         u32 *gp;
 203         int mask_type;
 204
 205         if (type != mem->type)
 206                 return -EINVAL;
 207
 208         mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
 209         if (mask_type != 0) {
 210                 /* We know nothing of memory types */
 211                 return -EINVAL;
 212         }
 213
 214         if (mem->page_count == 0)
 215                 return 0;
 216
 217         gp = (u32 *) &agp_bridge->gatt_table[pg_start];
 218         for (i = 0; i < mem->page_count; ++i) {
 219                 gp[i] = scratch_value;
 220         }
 221         mb();
 222         uninorth_tlbflush(mem);
 223
 224         return 0;
 225 }
 226
 227 static void uninorth_agp_enable(struct agp_bridge_data *bridge, u32 mode)
 228 {
 229         u32 command, scratch, status;
 230         int timeout;
 231
 232         pci_read_config_dword(bridge->dev,
 233                               bridge->capndx + PCI_AGP_STATUS,
 234                               &status);
 235
 236         command = agp_collect_device_status(bridge, mode, status);
 237         command |= PCI_AGP_COMMAND_AGP;
 238
 239         if (uninorth_rev == 0x21) {
 240                 /*
 241                  * Darwin disable AGP 4x on this revision, thus we
 242                  * may assume it's broken. This is an AGP2 controller.
 243                  */
 244                 command &= ~AGPSTAT2_4X;
 245         }
 246
 247         if ((uninorth_rev >= 0x30) && (uninorth_rev <= 0x33)) {
 248                 /*
 249                  * We need to set REQ_DEPTH to 7 for U3 versions 1.0, 2.1,
 250                  * 2.2 and 2.3, Darwin do so.
 251                  */
 252                 if ((command >> AGPSTAT_RQ_DEPTH_SHIFT) > 7)
 253                         command = (command & ~AGPSTAT_RQ_DEPTH)
 254                                 | (7 << AGPSTAT_RQ_DEPTH_SHIFT);
 255         }
 256
 257         uninorth_tlbflush(NULL);
 258
 259         timeout = 0;
 260         do {
 261                 pci_write_config_dword(bridge->dev,
 262                                        bridge->capndx + PCI_AGP_COMMAND,
 263                                        command);
 264                 pci_read_config_dword(bridge->dev,
 265                                       bridge->capndx + PCI_AGP_COMMAND,
 266                                        &scratch);
 267         } while ((scratch & PCI_AGP_COMMAND_AGP) == 0 && ++timeout < 1000);
 268         if ((scratch & PCI_AGP_COMMAND_AGP) == 0)
 269                 dev_err(&bridge->dev->dev, "can't write UniNorth AGP "
 270                         "command register\n");
 271
 272         if (uninorth_rev >= 0x30) {
 273                 /* This is an AGP V3 */
 274                 agp_device_command(command, (status & AGPSTAT_MODE_3_0) != 0);
 275         } else {
 276                 /* AGP V2 */
 277                 agp_device_command(command, false);
 278         }
 279
 280         uninorth_tlbflush(NULL);
 281 }
 282
 283 #ifdef CONFIG_PM
 284 /*
 285  * These Power Management routines are _not_ called by the normal PCI PM layer,
 286  * but directly by the video driver through function pointers in the device
 287  * tree.
 288  */
 289 static int agp_uninorth_suspend(struct pci_dev *pdev)
 290 {
 291         struct agp_bridge_data *bridge;
 292         u32 cmd;
 293         u8 agp;
 294         struct pci_dev *device = NULL;
 295
 296         bridge = agp_find_bridge(pdev);
 297         if (bridge == NULL)
 298                 return -ENODEV;
 299
 300         /* Only one suspend supported */
 301         if (bridge->dev_private_data)
 302                 return 0;
 303
 304         /* turn off AGP on the video chip, if it was enabled */
 305         for_each_pci_dev(device) {
 306                 /* Don't touch the bridge yet, device first */
 307                 if (device == pdev)
 308                         continue;
 309                 /* Only deal with devices on the same bus here, no Mac has a P2P
 310                  * bridge on the AGP port, and mucking around the entire PCI
 311                  * tree is source of problems on some machines because of a bug
 312                  * in some versions of pci_find_capability() when hitting a dead
 313                  * device
 314                  */
 315                 if (device->bus != pdev->bus)
 316                         continue;
 317                 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
 318                 if (!agp)
 319                         continue;
 320                 pci_read_config_dword(device, agp + PCI_AGP_COMMAND, &cmd);
 321                 if (!(cmd & PCI_AGP_COMMAND_AGP))
 322                         continue;
 323                 dev_info(&pdev->dev, "disabling AGP on device %s\n",
 324                          pci_name(device));
 325                 cmd &= ~PCI_AGP_COMMAND_AGP;
 326                 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, cmd);
 327         }
 328
 329         /* turn off AGP on the bridge */
 330         agp = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 331         pci_read_config_dword(pdev, agp + PCI_AGP_COMMAND, &cmd);
 332         bridge->dev_private_data = (void *)(long)cmd;
 333         if (cmd & PCI_AGP_COMMAND_AGP) {
 334                 dev_info(&pdev->dev, "disabling AGP on bridge\n");
 335                 cmd &= ~PCI_AGP_COMMAND_AGP;
 336                 pci_write_config_dword(pdev, agp + PCI_AGP_COMMAND, cmd);
 337         }
 338         /* turn off the GART */
 339         uninorth_cleanup();
 340
 341         return 0;
 342 }
 343
 344 static int agp_uninorth_resume(struct pci_dev *pdev)
 345 {
 346         struct agp_bridge_data *bridge;
 347         u32 command;
 348
 349         bridge = agp_find_bridge(pdev);
 350         if (bridge == NULL)
 351                 return -ENODEV;
 352
 353         command = (long)bridge->dev_private_data;
 354         bridge->dev_private_data = NULL;
 355         if (!(command & PCI_AGP_COMMAND_AGP))
 356                 return 0;
 357
 358         uninorth_agp_enable(bridge, command);
 359
 360         return 0;
 361 }
 362 #endif /* CONFIG_PM */
 363
 364 static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
 365 {
 366         char *table;
 367         char *table_end;
 368         int size;
 369         int page_order;
 370         int num_entries;
 371         int i;
 372         void *temp;
 373         struct page *page;
 374         struct page **pages;
 375
 376         /* We can't handle 2 level gatt's */
 377         if (bridge->driver->size_type == LVL2_APER_SIZE)
 378                 return -EINVAL;
 379
 380         table = NULL;
 381         i = bridge->aperture_size_idx;
 382         temp = bridge->current_size;
 383         size = page_order = num_entries = 0;
 384
 385         do {
 386                 size = A_SIZE_32(temp)->size;
 387                 page_order = A_SIZE_32(temp)->page_order;
 388                 num_entries = A_SIZE_32(temp)->num_entries;
 389
 390                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 391
 392                 if (table == NULL) {
 393                         i++;
 394                         bridge->current_size = A_IDX32(bridge);
 395                 } else {
 396                         bridge->aperture_size_idx = i;
 397                 }
 398         } while (!table && (i < bridge->driver->num_aperture_sizes));
 399
 400         if (table == NULL)
 401                 return -ENOMEM;
 402
 403         pages = kmalloc((1 << page_order) * sizeof(struct page*), GFP_KERNEL);
 404         if (pages == NULL)
 405                 goto enomem;
 406
 407         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 408
 409         for (page = virt_to_page(table), i = 0; page <= virt_to_page(table_end);
 410              page++, i++) {
 411                 SetPageReserved(page);
 412                 pages[i] = page;
 413         }
 414
 415         bridge->gatt_table_real = (u32 *) table;
 416         /* Need to clear out any dirty data still sitting in caches */
 417         flush_dcache_range((unsigned long)table,
 418                            (unsigned long)(table_end + PAGE_SIZE));
 419         bridge->gatt_table = vmap(pages, (1 << page_order), 0, PAGE_KERNEL_NCG);
 420
 421         if (bridge->gatt_table == NULL)
 422                 goto enomem;
 423
 424         bridge->gatt_bus_addr = virt_to_phys(table);
 425
 426         if (is_u3)
 427                 scratch_value = (page_to_phys(agp_bridge->scratch_page_page) >> PAGE_SHIFT) | 0x80000000UL;
 428         else
 429                 scratch_value = cpu_to_le32((page_to_phys(agp_bridge->scratch_page_page) & 0xFFFFF000UL) |
 430                                 0x1UL);
 431         for (i = 0; i < num_entries; i++)
 432                 bridge->gatt_table[i] = scratch_value;
 433
 434         return 0;
 435
 436 enomem:
 437         kfree(pages);
 438         if (table)
 439                 free_pages((unsigned long)table, page_order);
 440         return -ENOMEM;
 441 }
 442
 443 static int uninorth_free_gatt_table(struct agp_bridge_data *bridge)
 444 {
 445         int page_order;
 446         char *table, *table_end;
 447         void *temp;
 448         struct page *page;
 449
 450         temp = bridge->current_size;
 451         page_order = A_SIZE_32(temp)->page_order;
 452
 453         /* Do not worry about freeing memory, because if this is
 454          * called, then all agp memory is deallocated and removed
 455          * from the table.
 456          */
 457
 458         vunmap(bridge->gatt_table);
 459         table = (char *) bridge->gatt_table_real;
 460         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 461
 462         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 463                 ClearPageReserved(page);
 464
 465         free_pages((unsigned long) bridge->gatt_table_real, page_order);
 466
 467         return 0;
 468 }
 469
 470 void null_cache_flush(void)
 471 {
 472         mb();
 473 }
 474
 475 /* Setup function */
 476
 477 static const struct aper_size_info_32 uninorth_sizes[] =
 478 {
 479         {256, 65536, 6, 64},
 480         {128, 32768, 5, 32},
 481         {64, 16384, 4, 16},
 482         {32, 8192, 3, 8},
 483         {16, 4096, 2, 4},
 484         {8, 2048, 1, 2},
 485         {4, 1024, 0, 1}
 486 };
 487
 488 /*
 489  * Not sure that u3 supports that high aperture sizes but it
 490  * would strange if it did not :)
 491  */
 492 static const struct aper_size_info_32 u3_sizes[] =
 493 {
 494         {512, 131072, 7, 128},
 495         {256, 65536, 6, 64},
 496         {128, 32768, 5, 32},
 497         {64, 16384, 4, 16},
 498         {32, 8192, 3, 8},
 499         {16, 4096, 2, 4},
 500         {8, 2048, 1, 2},
 501         {4, 1024, 0, 1}
 502 };
 503
 504 const struct agp_bridge_driver uninorth_agp_driver = {
 505         .owner                  = THIS_MODULE,
 506         .aperture_sizes         = (void *)uninorth_sizes,
 507         .size_type              = U32_APER_SIZE,
 508         .num_aperture_sizes     = ARRAY_SIZE(uninorth_sizes),
 509         .configure              = uninorth_configure,
 510         .fetch_size             = uninorth_fetch_size,
 511         .cleanup                = uninorth_cleanup,
 512         .tlb_flush              = uninorth_tlbflush,
 513         .mask_memory            = agp_generic_mask_memory,
 514         .masks                  = NULL,
 515         .cache_flush            = null_cache_flush,
 516         .agp_enable             = uninorth_agp_enable,
 517         .create_gatt_table      = uninorth_create_gatt_table,
 518         .free_gatt_table        = uninorth_free_gatt_table,
 519         .insert_memory          = uninorth_insert_memory,
 520         .remove_memory          = uninorth_remove_memory,
 521         .alloc_by_type          = agp_generic_alloc_by_type,
 522         .free_by_type           = agp_generic_free_by_type,
 523         .agp_alloc_page         = agp_generic_alloc_page,
 524         .agp_alloc_pages        = agp_generic_alloc_pages,
 525         .agp_destroy_page       = agp_generic_destroy_page,
 526         .agp_destroy_pages      = agp_generic_destroy_pages,
 527         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 528         .cant_use_aperture      = true,
 529         .needs_scratch_page     = true,
 530 };
 531
 532 const struct agp_bridge_driver u3_agp_driver = {
 533         .owner                  = THIS_MODULE,
 534         .aperture_sizes         = (void *)u3_sizes,
 535         .size_type              = U32_APER_SIZE,
 536         .num_aperture_sizes     = ARRAY_SIZE(u3_sizes),
 537         .configure              = uninorth_configure,
 538         .fetch_size             = uninorth_fetch_size,
 539         .cleanup                = uninorth_cleanup,
 540         .tlb_flush              = uninorth_tlbflush,
 541         .mask_memory            = agp_generic_mask_memory,
 542         .masks                  = NULL,
 543         .cache_flush            = null_cache_flush,
 544         .agp_enable             = uninorth_agp_enable,
 545         .create_gatt_table      = uninorth_create_gatt_table,
 546         .free_gatt_table        = uninorth_free_gatt_table,
 547         .insert_memory          = uninorth_insert_memory,
 548         .remove_memory          = uninorth_remove_memory,
 549         .alloc_by_type          = agp_generic_alloc_by_type,
 550         .free_by_type           = agp_generic_free_by_type,
 551         .agp_alloc_page         = agp_generic_alloc_page,
 552         .agp_alloc_pages        = agp_generic_alloc_pages,
 553         .agp_destroy_page       = agp_generic_destroy_page,
 554         .agp_destroy_pages      = agp_generic_destroy_pages,
 555         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 556         .cant_use_aperture      = true,
 557         .needs_scratch_page     = true,
 558 };
 559
 560 static struct agp_device_ids uninorth_agp_device_ids[] __devinitdata = {
 561         {
 562                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP,
 563                 .chipset_name   = "UniNorth",
 564         },
 565         {
 566                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
 567                 .chipset_name   = "UniNorth/Pangea",
 568         },
 569         {
 570                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
 571                 .chipset_name   = "UniNorth 1.5",
 572         },
 573         {
 574                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
 575                 .chipset_name   = "UniNorth 2",
 576         },
 577         {
 578                 .device_id      = PCI_DEVICE_ID_APPLE_U3_AGP,
 579                 .chipset_name   = "U3",
 580         },
 581         {
 582                 .device_id      = PCI_DEVICE_ID_APPLE_U3L_AGP,
 583                 .chipset_name   = "U3L",
 584         },
 585         {
 586                 .device_id      = PCI_DEVICE_ID_APPLE_U3H_AGP,
 587                 .chipset_name   = "U3H",
 588         },
 589         {
 590                 .device_id      = PCI_DEVICE_ID_APPLE_IPID2_AGP,
 591                 .chipset_name   = "UniNorth/Intrepid2",
 592         },
 593 };
 594
 595 static int __devinit agp_uninorth_probe(struct pci_dev *pdev,
 596                                         const struct pci_device_id *ent)
 597 {
 598         struct agp_device_ids *devs = uninorth_agp_device_ids;
 599         struct agp_bridge_data *bridge;
 600         struct device_node *uninorth_node;
 601         u8 cap_ptr;
 602         int j;
 603
 604         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 605         if (cap_ptr == 0)
 606                 return -ENODEV;
 607
 608         /* probe for known chipsets */
 609         for (j = 0; devs[j].chipset_name != NULL; ++j) {
 610                 if (pdev->device == devs[j].device_id) {
 611                         dev_info(&pdev->dev, "Apple %s chipset\n",
 612                                  devs[j].chipset_name);
 613                         goto found;
 614                 }
 615         }
 616
 617         dev_err(&pdev->dev, "unsupported Apple chipset [%04x/%04x]\n",
 618                 pdev->vendor, pdev->device);
 619         return -ENODEV;
 620
 621  found:
 622         /* Set revision to 0 if we could not read it. */
 623         uninorth_rev = 0;
 624         is_u3 = 0;
 625         /* Locate core99 Uni-N */
 626         uninorth_node = of_find_node_by_name(NULL, "uni-n");
 627         /* Locate G5 u3 */
 628         if (uninorth_node == NULL) {
 629                 is_u3 = 1;
 630                 uninorth_node = of_find_node_by_name(NULL, "u3");
 631         }
 632         if (uninorth_node) {
 633                 const int *revprop = of_get_property(uninorth_node,
 634                                 "device-rev", NULL);
 635                 if (revprop != NULL)
 636                         uninorth_rev = *revprop & 0x3f;
 637                 of_node_put(uninorth_node);
 638         }
 639
 640 #ifdef CONFIG_PM
 641         /* Inform platform of our suspend/resume caps */
 642         pmac_register_agp_pm(pdev, agp_uninorth_suspend, agp_uninorth_resume);
 643 #endif
 644
 645         /* Allocate & setup our driver */
 646         bridge = agp_alloc_bridge();
 647         if (!bridge)
 648                 return -ENOMEM;
 649
 650         if (is_u3)
 651                 bridge->driver = &u3_agp_driver;
 652         else
 653                 bridge->driver = &uninorth_agp_driver;
 654
 655         bridge->dev = pdev;
 656         bridge->capndx = cap_ptr;
 657         bridge->flags = AGP_ERRATA_FASTWRITES;
 658
 659         /* Fill in the mode register */
 660         pci_read_config_dword(pdev, cap_ptr+PCI_AGP_STATUS, &bridge->mode);
 661
 662         pci_set_drvdata(pdev, bridge);
 663         return agp_add_bridge(bridge);
 664 }
 665
 666 static void __devexit agp_uninorth_remove(struct pci_dev *pdev)
 667 {
 668         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 669
 670 #ifdef CONFIG_PM
 671         /* Inform platform of our suspend/resume caps */
 672         pmac_register_agp_pm(pdev, NULL, NULL);
 673 #endif
 674
 675         agp_remove_bridge(bridge);
 676         agp_put_bridge(bridge);
 677 }
 678
 679 static struct pci_device_id agp_uninorth_pci_table[] = {
 680         {
 681         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 682         .class_mask     = ~0,
 683         .vendor         = PCI_VENDOR_ID_APPLE,
 684         .device         = PCI_ANY_ID,
 685         .subvendor      = PCI_ANY_ID,
 686         .subdevice      = PCI_ANY_ID,
 687         },
 688         { }
 689 };
 690
 691 MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);
 692
 693 static struct pci_driver agp_uninorth_pci_driver = {
 694         .name           = "agpgart-uninorth",
 695         .id_table       = agp_uninorth_pci_table,
 696         .probe          = agp_uninorth_probe,
 697         .remove         = agp_uninorth_remove,
 698 };
 699
 700 static int __init agp_uninorth_init(void)
 701 {
 702         if (agp_off)
 703                 return -EINVAL;
 704         return pci_register_driver(&agp_uninorth_pci_driver);
 705 }
 706
 707 static void __exit agp_uninorth_cleanup(void)
 708 {
 709         pci_unregister_driver(&agp_uninorth_pci_driver);
 710 }
 711
 712 module_init(agp_uninorth_init);
 713 module_exit(agp_uninorth_cleanup);
 714
 715 module_param(aperture, charp, 0);
 716 MODULE_PARM_DESC(aperture,
 717                  "Aperture size, must be power of two between 4MB and an\n"
 718                  "\t\tupper limit specific to the UniNorth revision.\n"
 719                  "\t\tDefault: " DEFAULT_APERTURE_STRING "M");
 720
 721 MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
 722 MODULE_LICENSE("GPL");