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   1 /*
   2  * AMD K7 AGPGART routines.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/pci.h>
   7 #include <linux/init.h>
   8 #include <linux/agp_backend.h>
   9 #include <linux/page-flags.h>
  10 #include <linux/mm.h>
  11 #include <linux/slab.h>
  12 #include "agp.h"
  13
  14 #define AMD_MMBASE      0x14
  15 #define AMD_APSIZE      0xac
  16 #define AMD_MODECNTL    0xb0
  17 #define AMD_MODECNTL2   0xb2
  18 #define AMD_GARTENABLE  0x02    /* In mmio region (16-bit register) */
  19 #define AMD_ATTBASE     0x04    /* In mmio region (32-bit register) */
  20 #define AMD_TLBFLUSH    0x0c    /* In mmio region (32-bit register) */
  21 #define AMD_CACHEENTRY  0x10    /* In mmio region (32-bit register) */
  22
  23 static struct pci_device_id agp_amdk7_pci_table[];
  24
  25 struct amd_page_map {
  26         unsigned long *real;
  27         unsigned long __iomem *remapped;
  28 };
  29
  30 static struct _amd_irongate_private {
  31         volatile u8 __iomem *registers;
  32         struct amd_page_map **gatt_pages;
  33         int num_tables;
  34 } amd_irongate_private;
  35
  36 static int amd_create_page_map(struct amd_page_map *page_map)
  37 {
  38         int i;
  39
  40         page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
  41         if (page_map->real == NULL)
  42                 return -ENOMEM;
  43
  44 #ifndef CONFIG_X86
  45         SetPageReserved(virt_to_page(page_map->real));
  46         global_cache_flush();
  47         page_map->remapped = ioremap_nocache(virt_to_phys(page_map->real),
  48                                             PAGE_SIZE);
  49         if (page_map->remapped == NULL) {
  50                 ClearPageReserved(virt_to_page(page_map->real));
  51                 free_page((unsigned long) page_map->real);
  52                 page_map->real = NULL;
  53                 return -ENOMEM;
  54         }
  55         global_cache_flush();
  56 #else
  57         set_memory_uc((unsigned long)page_map->real, 1);
  58         page_map->remapped = page_map->real;
  59 #endif
  60
  61         for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
  62                 writel(agp_bridge->scratch_page, page_map->remapped+i);
  63                 readl(page_map->remapped+i);    /* PCI Posting. */
  64         }
  65
  66         return 0;
  67 }
  68
  69 static void amd_free_page_map(struct amd_page_map *page_map)
  70 {
  71 #ifndef CONFIG_X86
  72         iounmap(page_map->remapped);
  73         ClearPageReserved(virt_to_page(page_map->real));
  74 #else
  75         set_memory_wb((unsigned long)page_map->real, 1);
  76 #endif
  77         free_page((unsigned long) page_map->real);
  78 }
  79
  80 static void amd_free_gatt_pages(void)
  81 {
  82         int i;
  83         struct amd_page_map **tables;
  84         struct amd_page_map *entry;
  85
  86         tables = amd_irongate_private.gatt_pages;
  87         for (i = 0; i < amd_irongate_private.num_tables; i++) {
  88                 entry = tables[i];
  89                 if (entry != NULL) {
  90                         if (entry->real != NULL)
  91                                 amd_free_page_map(entry);
  92                         kfree(entry);
  93                 }
  94         }
  95         kfree(tables);
  96         amd_irongate_private.gatt_pages = NULL;
  97 }
  98
  99 static int amd_create_gatt_pages(int nr_tables)
 100 {
 101         struct amd_page_map **tables;
 102         struct amd_page_map *entry;
 103         int retval = 0;
 104         int i;
 105
 106         tables = kzalloc((nr_tables + 1) * sizeof(struct amd_page_map *),GFP_KERNEL);
 107         if (tables == NULL)
 108                 return -ENOMEM;
 109
 110         for (i = 0; i < nr_tables; i++) {
 111                 entry = kzalloc(sizeof(struct amd_page_map), GFP_KERNEL);
 112                 tables[i] = entry;
 113                 if (entry == NULL) {
 114                         retval = -ENOMEM;
 115                         break;
 116                 }
 117                 retval = amd_create_page_map(entry);
 118                 if (retval != 0)
 119                         break;
 120         }
 121         amd_irongate_private.num_tables = i;
 122         amd_irongate_private.gatt_pages = tables;
 123
 124         if (retval != 0)
 125                 amd_free_gatt_pages();
 126
 127         return retval;
 128 }
 129
 130 /* Since we don't need contiguous memory we just try
 131  * to get the gatt table once
 132  */
 133
 134 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
 135 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
 136         GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
 137 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
 138 #define GET_GATT(addr) (amd_irongate_private.gatt_pages[\
 139         GET_PAGE_DIR_IDX(addr)]->remapped)
 140
 141 static int amd_create_gatt_table(struct agp_bridge_data *bridge)
 142 {
 143         struct aper_size_info_lvl2 *value;
 144         struct amd_page_map page_dir;
 145         unsigned long addr;
 146         int retval;
 147         u32 temp;
 148         int i;
 149
 150         value = A_SIZE_LVL2(agp_bridge->current_size);
 151         retval = amd_create_page_map(&page_dir);
 152         if (retval != 0)
 153                 return retval;
 154
 155         retval = amd_create_gatt_pages(value->num_entries / 1024);
 156         if (retval != 0) {
 157                 amd_free_page_map(&page_dir);
 158                 return retval;
 159         }
 160
 161         agp_bridge->gatt_table_real = (u32 *)page_dir.real;
 162         agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
 163         agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
 164
 165         /* Get the address for the gart region.
 166          * This is a bus address even on the alpha, b/c its
 167          * used to program the agp master not the cpu
 168          */
 169
 170         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
 171         addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 172         agp_bridge->gart_bus_addr = addr;
 173
 174         /* Calculate the agp offset */
 175         for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
 176                 writel(virt_to_phys(amd_irongate_private.gatt_pages[i]->real) | 1,
 177                         page_dir.remapped+GET_PAGE_DIR_OFF(addr));
 178                 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));        /* PCI Posting. */
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int amd_free_gatt_table(struct agp_bridge_data *bridge)
 185 {
 186         struct amd_page_map page_dir;
 187
 188         page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
 189         page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
 190
 191         amd_free_gatt_pages();
 192         amd_free_page_map(&page_dir);
 193         return 0;
 194 }
 195
 196 static int amd_irongate_fetch_size(void)
 197 {
 198         int i;
 199         u32 temp;
 200         struct aper_size_info_lvl2 *values;
 201
 202         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 203         temp = (temp & 0x0000000e);
 204         values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
 205         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 206                 if (temp == values[i].size_value) {
 207                         agp_bridge->previous_size =
 208                             agp_bridge->current_size = (void *) (values + i);
 209
 210                         agp_bridge->aperture_size_idx = i;
 211                         return values[i].size;
 212                 }
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int amd_irongate_configure(void)
 219 {
 220         struct aper_size_info_lvl2 *current_size;
 221         u32 temp;
 222         u16 enable_reg;
 223
 224         current_size = A_SIZE_LVL2(agp_bridge->current_size);
 225
 226         if (!amd_irongate_private.registers) {
 227                 /* Get the memory mapped registers */
 228                 pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
 229                 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 230                 amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 231                 if (!amd_irongate_private.registers)
 232                         return -ENOMEM;
 233         }
 234
 235         /* Write out the address of the gatt table */
 236         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
 237         readl(amd_irongate_private.registers+AMD_ATTBASE);      /* PCI Posting. */
 238
 239         /* Write the Sync register */
 240         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
 241
 242         /* Set indexing mode */
 243         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
 244
 245         /* Write the enable register */
 246         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 247         enable_reg = (enable_reg | 0x0004);
 248         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 249         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 250
 251         /* Write out the size register */
 252         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 253         temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
 254         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 255
 256         /* Flush the tlb */
 257         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 258         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting.*/
 259         return 0;
 260 }
 261
 262 static void amd_irongate_cleanup(void)
 263 {
 264         struct aper_size_info_lvl2 *previous_size;
 265         u32 temp;
 266         u16 enable_reg;
 267
 268         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
 269
 270         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 271         enable_reg = (enable_reg & ~(0x0004));
 272         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 273         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 274
 275         /* Write back the previous size and disable gart translation */
 276         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 277         temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 278         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 279         iounmap((void __iomem *) amd_irongate_private.registers);
 280 }
 281
 282 /*
 283  * This routine could be implemented by taking the addresses
 284  * written to the GATT, and flushing them individually.  However
 285  * currently it just flushes the whole table.  Which is probably
 286  * more efficent, since agp_memory blocks can be a large number of
 287  * entries.
 288  */
 289
 290 static void amd_irongate_tlbflush(struct agp_memory *temp)
 291 {
 292         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 293         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting. */
 294 }
 295
 296 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
 297 {
 298         int i, j, num_entries;
 299         unsigned long __iomem *cur_gatt;
 300         unsigned long addr;
 301
 302         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 303
 304         if (type != 0 || mem->type != 0)
 305                 return -EINVAL;
 306
 307         if ((pg_start + mem->page_count) > num_entries)
 308                 return -EINVAL;
 309
 310         j = pg_start;
 311         while (j < (pg_start + mem->page_count)) {
 312                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 313                 cur_gatt = GET_GATT(addr);
 314                 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
 315                         return -EBUSY;
 316                 j++;
 317         }
 318
 319         if (!mem->is_flushed) {
 320                 global_cache_flush();
 321                 mem->is_flushed = true;
 322         }
 323
 324         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 325                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 326                 cur_gatt = GET_GATT(addr);
 327                 writel(agp_generic_mask_memory(agp_bridge,
 328                                                page_to_phys(mem->pages[i]),
 329                                                mem->type),
 330                        cur_gatt+GET_GATT_OFF(addr));
 331                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 332         }
 333         amd_irongate_tlbflush(mem);
 334         return 0;
 335 }
 336
 337 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 338 {
 339         int i;
 340         unsigned long __iomem *cur_gatt;
 341         unsigned long addr;
 342
 343         if (type != 0 || mem->type != 0)
 344                 return -EINVAL;
 345
 346         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 347                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 348                 cur_gatt = GET_GATT(addr);
 349                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 350                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 351         }
 352
 353         amd_irongate_tlbflush(mem);
 354         return 0;
 355 }
 356
 357 static const struct aper_size_info_lvl2 amd_irongate_sizes[7] =
 358 {
 359         {2048, 524288, 0x0000000c},
 360         {1024, 262144, 0x0000000a},
 361         {512, 131072, 0x00000008},
 362         {256, 65536, 0x00000006},
 363         {128, 32768, 0x00000004},
 364         {64, 16384, 0x00000002},
 365         {32, 8192, 0x00000000}
 366 };
 367
 368 static const struct gatt_mask amd_irongate_masks[] =
 369 {
 370         {.mask = 1, .type = 0}
 371 };
 372
 373 static const struct agp_bridge_driver amd_irongate_driver = {
 374         .owner                  = THIS_MODULE,
 375         .aperture_sizes         = amd_irongate_sizes,
 376         .size_type              = LVL2_APER_SIZE,
 377         .num_aperture_sizes     = 7,
 378         .configure              = amd_irongate_configure,
 379         .fetch_size             = amd_irongate_fetch_size,
 380         .cleanup                = amd_irongate_cleanup,
 381         .tlb_flush              = amd_irongate_tlbflush,
 382         .mask_memory            = agp_generic_mask_memory,
 383         .masks                  = amd_irongate_masks,
 384         .agp_enable             = agp_generic_enable,
 385         .cache_flush            = global_cache_flush,
 386         .create_gatt_table      = amd_create_gatt_table,
 387         .free_gatt_table        = amd_free_gatt_table,
 388         .insert_memory          = amd_insert_memory,
 389         .remove_memory          = amd_remove_memory,
 390         .alloc_by_type          = agp_generic_alloc_by_type,
 391         .free_by_type           = agp_generic_free_by_type,
 392         .agp_alloc_page         = agp_generic_alloc_page,
 393         .agp_alloc_pages        = agp_generic_alloc_pages,
 394         .agp_destroy_page       = agp_generic_destroy_page,
 395         .agp_destroy_pages      = agp_generic_destroy_pages,
 396         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 397 };
 398
 399 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
 400 {
 401         {
 402                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 403                 .chipset_name   = "Irongate",
 404         },
 405         {
 406                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 407                 .chipset_name   = "761",
 408         },
 409         {
 410                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 411                 .chipset_name   = "760MP",
 412         },
 413         { }, /* dummy final entry, always present */
 414 };
 415
 416 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
 417                                      const struct pci_device_id *ent)
 418 {
 419         struct agp_bridge_data *bridge;
 420         u8 cap_ptr;
 421         int j;
 422
 423         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 424         if (!cap_ptr)
 425                 return -ENODEV;
 426
 427         j = ent - agp_amdk7_pci_table;
 428         dev_info(&pdev->dev, "AMD %s chipset\n",
 429                  amd_agp_device_ids[j].chipset_name);
 430
 431         bridge = agp_alloc_bridge();
 432         if (!bridge)
 433                 return -ENOMEM;
 434
 435         bridge->driver = &amd_irongate_driver;
 436         bridge->dev_private_data = &amd_irongate_private,
 437         bridge->dev = pdev;
 438         bridge->capndx = cap_ptr;
 439
 440         /* 751 Errata (22564_B-1.PDF)
 441            erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
 442            system controller may experience noise due to strong drive strengths
 443          */
 444         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
 445                 struct pci_dev *gfxcard=NULL;
 446
 447                 cap_ptr = 0;
 448                 while (!cap_ptr) {
 449                         gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
 450                         if (!gfxcard) {
 451                                 dev_info(&pdev->dev, "no AGP VGA controller\n");
 452                                 return -ENODEV;
 453                         }
 454                         cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
 455                 }
 456
 457                 /* With so many variants of NVidia cards, it's simpler just
 458                    to blacklist them all, and then whitelist them as needed
 459                    (if necessary at all). */
 460                 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
 461                         agp_bridge->flags |= AGP_ERRATA_1X;
 462                         dev_info(&pdev->dev, "AMD 751 chipset with NVidia GeForce; forcing 1X due to errata\n");
 463                 }
 464                 pci_dev_put(gfxcard);
 465         }
 466
 467         /* 761 Errata (23613_F.pdf)
 468          * Revisions B0/B1 were a disaster.
 469          * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
 470          * erratum 45: Timing problem prevents fast writes -- Disable fast write.
 471          * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
 472          * With this lot disabled, we should prevent lockups. */
 473         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
 474                 if (pdev->revision == 0x10 || pdev->revision == 0x11) {
 475                         agp_bridge->flags = AGP_ERRATA_FASTWRITES;
 476                         agp_bridge->flags |= AGP_ERRATA_SBA;
 477                         agp_bridge->flags |= AGP_ERRATA_1X;
 478                         dev_info(&pdev->dev, "AMD 761 chipset with errata; disabling AGP fast writes & SBA and forcing to 1X\n");
 479                 }
 480         }
 481
 482         /* Fill in the mode register */
 483         pci_read_config_dword(pdev,
 484                         bridge->capndx+PCI_AGP_STATUS,
 485                         &bridge->mode);
 486
 487         pci_set_drvdata(pdev, bridge);
 488         return agp_add_bridge(bridge);
 489 }
 490
 491 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
 492 {
 493         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 494
 495         agp_remove_bridge(bridge);
 496         agp_put_bridge(bridge);
 497 }
 498
 499 #ifdef CONFIG_PM
 500
 501 static int agp_amdk7_suspend(struct pci_dev *pdev, pm_message_t state)
 502 {
 503         pci_save_state(pdev);
 504         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 505
 506         return 0;
 507 }
 508
 509 static int agp_amdk7_resume(struct pci_dev *pdev)
 510 {
 511         pci_set_power_state(pdev, PCI_D0);
 512         pci_restore_state(pdev);
 513
 514         return amd_irongate_driver.configure();
 515 }
 516
 517 #endif /* CONFIG_PM */
 518
 519 /* must be the same order as name table above */
 520 static struct pci_device_id agp_amdk7_pci_table[] = {
 521         {
 522         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 523         .class_mask     = ~0,
 524         .vendor         = PCI_VENDOR_ID_AMD,
 525         .device         = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 526         .subvendor      = PCI_ANY_ID,
 527         .subdevice      = PCI_ANY_ID,
 528         },
 529         {
 530         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 531         .class_mask     = ~0,
 532         .vendor         = PCI_VENDOR_ID_AMD,
 533         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 534         .subvendor      = PCI_ANY_ID,
 535         .subdevice      = PCI_ANY_ID,
 536         },
 537         {
 538         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 539         .class_mask     = ~0,
 540         .vendor         = PCI_VENDOR_ID_AMD,
 541         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 542         .subvendor      = PCI_ANY_ID,
 543         .subdevice      = PCI_ANY_ID,
 544         },
 545         { }
 546 };
 547
 548 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
 549
 550 static struct pci_driver agp_amdk7_pci_driver = {
 551         .name           = "agpgart-amdk7",
 552         .id_table       = agp_amdk7_pci_table,
 553         .probe          = agp_amdk7_probe,
 554         .remove         = agp_amdk7_remove,
 555 #ifdef CONFIG_PM
 556         .suspend        = agp_amdk7_suspend,
 557         .resume         = agp_amdk7_resume,
 558 #endif
 559 };
 560
 561 static int __init agp_amdk7_init(void)
 562 {
 563         if (agp_off)
 564                 return -EINVAL;
 565         return pci_register_driver(&agp_amdk7_pci_driver);
 566 }
 567
 568 static void __exit agp_amdk7_cleanup(void)
 569 {
 570         pci_unregister_driver(&agp_amdk7_pci_driver);
 571 }
 572
 573 module_init(agp_amdk7_init);
 574 module_exit(agp_amdk7_cleanup);
 575
 576 MODULE_LICENSE("GPL and additional rights");