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 #ifndef CONFIG_X86
  45         SetPageReserved(virt_to_page(page_map->real));
  46         global_cache_flush();
  47         page_map->remapped = ioremap_nocache(virt_to_gart(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_gart(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_gart(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         /* Get the memory mapped registers */
 227         pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
 228         temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 229         amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 230         if (!amd_irongate_private.registers)
 231                 return -ENOMEM;
 232
 233         /* Write out the address of the gatt table */
 234         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
 235         readl(amd_irongate_private.registers+AMD_ATTBASE);      /* PCI Posting. */
 236
 237         /* Write the Sync register */
 238         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
 239
 240         /* Set indexing mode */
 241         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
 242
 243         /* Write the enable register */
 244         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 245         enable_reg = (enable_reg | 0x0004);
 246         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 247         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 248
 249         /* Write out the size register */
 250         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 251         temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
 252         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 253
 254         /* Flush the tlb */
 255         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 256         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting.*/
 257         return 0;
 258 }
 259
 260 static void amd_irongate_cleanup(void)
 261 {
 262         struct aper_size_info_lvl2 *previous_size;
 263         u32 temp;
 264         u16 enable_reg;
 265
 266         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
 267
 268         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 269         enable_reg = (enable_reg & ~(0x0004));
 270         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 271         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 272
 273         /* Write back the previous size and disable gart translation */
 274         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 275         temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 276         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 277         iounmap((void __iomem *) amd_irongate_private.registers);
 278 }
 279
 280 /*
 281  * This routine could be implemented by taking the addresses
 282  * written to the GATT, and flushing them individually.  However
 283  * currently it just flushes the whole table.  Which is probably
 284  * more efficent, since agp_memory blocks can be a large number of
 285  * entries.
 286  */
 287
 288 static void amd_irongate_tlbflush(struct agp_memory *temp)
 289 {
 290         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 291         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting. */
 292 }
 293
 294 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
 295 {
 296         int i, j, num_entries;
 297         unsigned long __iomem *cur_gatt;
 298         unsigned long addr;
 299
 300         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 301
 302         if (type != 0 || mem->type != 0)
 303                 return -EINVAL;
 304
 305         if ((pg_start + mem->page_count) > num_entries)
 306                 return -EINVAL;
 307
 308         j = pg_start;
 309         while (j < (pg_start + mem->page_count)) {
 310                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 311                 cur_gatt = GET_GATT(addr);
 312                 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
 313                         return -EBUSY;
 314                 j++;
 315         }
 316
 317         if (!mem->is_flushed) {
 318                 global_cache_flush();
 319                 mem->is_flushed = true;
 320         }
 321
 322         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 323                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 324                 cur_gatt = GET_GATT(addr);
 325                 writel(agp_generic_mask_memory(agp_bridge,
 326                         mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
 327                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 328         }
 329         amd_irongate_tlbflush(mem);
 330         return 0;
 331 }
 332
 333 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 334 {
 335         int i;
 336         unsigned long __iomem *cur_gatt;
 337         unsigned long addr;
 338
 339         if (type != 0 || mem->type != 0)
 340                 return -EINVAL;
 341
 342         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 343                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 344                 cur_gatt = GET_GATT(addr);
 345                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 346                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 347         }
 348
 349         amd_irongate_tlbflush(mem);
 350         return 0;
 351 }
 352
 353 static const struct aper_size_info_lvl2 amd_irongate_sizes[7] =
 354 {
 355         {2048, 524288, 0x0000000c},
 356         {1024, 262144, 0x0000000a},
 357         {512, 131072, 0x00000008},
 358         {256, 65536, 0x00000006},
 359         {128, 32768, 0x00000004},
 360         {64, 16384, 0x00000002},
 361         {32, 8192, 0x00000000}
 362 };
 363
 364 static const struct gatt_mask amd_irongate_masks[] =
 365 {
 366         {.mask = 1, .type = 0}
 367 };
 368
 369 static const struct agp_bridge_driver amd_irongate_driver = {
 370         .owner                  = THIS_MODULE,
 371         .aperture_sizes         = amd_irongate_sizes,
 372         .size_type              = LVL2_APER_SIZE,
 373         .num_aperture_sizes     = 7,
 374         .configure              = amd_irongate_configure,
 375         .fetch_size             = amd_irongate_fetch_size,
 376         .cleanup                = amd_irongate_cleanup,
 377         .tlb_flush              = amd_irongate_tlbflush,
 378         .mask_memory            = agp_generic_mask_memory,
 379         .masks                  = amd_irongate_masks,
 380         .agp_enable             = agp_generic_enable,
 381         .cache_flush            = global_cache_flush,
 382         .create_gatt_table      = amd_create_gatt_table,
 383         .free_gatt_table        = amd_free_gatt_table,
 384         .insert_memory          = amd_insert_memory,
 385         .remove_memory          = amd_remove_memory,
 386         .alloc_by_type          = agp_generic_alloc_by_type,
 387         .free_by_type           = agp_generic_free_by_type,
 388         .agp_alloc_page         = agp_generic_alloc_page,
 389         .agp_destroy_page       = agp_generic_destroy_page,
 390         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 391 };
 392
 393 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
 394 {
 395         {
 396                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 397                 .chipset_name   = "Irongate",
 398         },
 399         {
 400                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 401                 .chipset_name   = "761",
 402         },
 403         {
 404                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 405                 .chipset_name   = "760MP",
 406         },
 407         { }, /* dummy final entry, always present */
 408 };
 409
 410 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
 411                                      const struct pci_device_id *ent)
 412 {
 413         struct agp_bridge_data *bridge;
 414         u8 cap_ptr;
 415         int j;
 416
 417         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 418         if (!cap_ptr)
 419                 return -ENODEV;
 420
 421         j = ent - agp_amdk7_pci_table;
 422         printk(KERN_INFO PFX "Detected AMD %s chipset\n",
 423                amd_agp_device_ids[j].chipset_name);
 424
 425         bridge = agp_alloc_bridge();
 426         if (!bridge)
 427                 return -ENOMEM;
 428
 429         bridge->driver = &amd_irongate_driver;
 430         bridge->dev_private_data = &amd_irongate_private,
 431         bridge->dev = pdev;
 432         bridge->capndx = cap_ptr;
 433
 434         /* 751 Errata (22564_B-1.PDF)
 435            erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
 436            system controller may experience noise due to strong drive strengths
 437          */
 438         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
 439                 struct pci_dev *gfxcard=NULL;
 440
 441                 cap_ptr = 0;
 442                 while (!cap_ptr) {
 443                         gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
 444                         if (!gfxcard) {
 445                                 printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 446                                 return -ENODEV;
 447                         }
 448                         cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
 449                 }
 450
 451                 /* With so many variants of NVidia cards, it's simpler just
 452                    to blacklist them all, and then whitelist them as needed
 453                    (if necessary at all). */
 454                 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
 455                         agp_bridge->flags |= AGP_ERRATA_1X;
 456                         printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");
 457                 }
 458                 pci_dev_put(gfxcard);
 459         }
 460
 461         /* 761 Errata (23613_F.pdf)
 462          * Revisions B0/B1 were a disaster.
 463          * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
 464          * erratum 45: Timing problem prevents fast writes -- Disable fast write.
 465          * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
 466          * With this lot disabled, we should prevent lockups. */
 467         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
 468                 if (pdev->revision == 0x10 || pdev->revision == 0x11) {
 469                         agp_bridge->flags = AGP_ERRATA_FASTWRITES;
 470                         agp_bridge->flags |= AGP_ERRATA_SBA;
 471                         agp_bridge->flags |= AGP_ERRATA_1X;
 472                         printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
 473                 }
 474         }
 475
 476         /* Fill in the mode register */
 477         pci_read_config_dword(pdev,
 478                         bridge->capndx+PCI_AGP_STATUS,
 479                         &bridge->mode);
 480
 481         pci_set_drvdata(pdev, bridge);
 482         return agp_add_bridge(bridge);
 483 }
 484
 485 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
 486 {
 487         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 488
 489         agp_remove_bridge(bridge);
 490         agp_put_bridge(bridge);
 491 }
 492
 493 /* must be the same order as name table above */
 494 static struct pci_device_id agp_amdk7_pci_table[] = {
 495         {
 496         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 497         .class_mask     = ~0,
 498         .vendor         = PCI_VENDOR_ID_AMD,
 499         .device         = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 500         .subvendor      = PCI_ANY_ID,
 501         .subdevice      = PCI_ANY_ID,
 502         },
 503         {
 504         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 505         .class_mask     = ~0,
 506         .vendor         = PCI_VENDOR_ID_AMD,
 507         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 508         .subvendor      = PCI_ANY_ID,
 509         .subdevice      = PCI_ANY_ID,
 510         },
 511         {
 512         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 513         .class_mask     = ~0,
 514         .vendor         = PCI_VENDOR_ID_AMD,
 515         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 516         .subvendor      = PCI_ANY_ID,
 517         .subdevice      = PCI_ANY_ID,
 518         },
 519         { }
 520 };
 521
 522 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
 523
 524 static struct pci_driver agp_amdk7_pci_driver = {
 525         .name           = "agpgart-amdk7",
 526         .id_table       = agp_amdk7_pci_table,
 527         .probe          = agp_amdk7_probe,
 528         .remove         = agp_amdk7_remove,
 529 };
 530
 531 static int __init agp_amdk7_init(void)
 532 {
 533         if (agp_off)
 534                 return -EINVAL;
 535         return pci_register_driver(&agp_amdk7_pci_driver);
 536 }
 537
 538 static void __exit agp_amdk7_cleanup(void)
 539 {
 540         pci_unregister_driver(&agp_amdk7_pci_driver);
 541 }
 542
 543 module_init(agp_amdk7_init);
 544 module_exit(agp_amdk7_cleanup);
 545
 546 MODULE_LICENSE("GPL and additional rights");