git.oblomov.eu Git - linux-2.6/blob - drivers/char/agp/amd-k7-agp.c

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