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                 if (entry == NULL) {
 104                         retval = -ENOMEM;
 105                         break;
 106                 }
 107                 tables[i] = entry;
 108                 retval = amd_create_page_map(entry);
 109                 if (retval != 0)
 110                         break;
 111         }
 112         amd_irongate_private.num_tables = nr_tables;
 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
 222         /* Write out the address of the gatt table */
 223         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
 224         readl(amd_irongate_private.registers+AMD_ATTBASE);      /* PCI Posting. */
 225
 226         /* Write the Sync register */
 227         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
 228
 229         /* Set indexing mode */
 230         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
 231
 232         /* Write the enable register */
 233         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 234         enable_reg = (enable_reg | 0x0004);
 235         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 236         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 237
 238         /* Write out the size register */
 239         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 240         temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
 241         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 242
 243         /* Flush the tlb */
 244         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 245         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting.*/
 246         return 0;
 247 }
 248
 249 static void amd_irongate_cleanup(void)
 250 {
 251         struct aper_size_info_lvl2 *previous_size;
 252         u32 temp;
 253         u16 enable_reg;
 254
 255         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
 256
 257         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 258         enable_reg = (enable_reg & ~(0x0004));
 259         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 260         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 261
 262         /* Write back the previous size and disable gart translation */
 263         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 264         temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 265         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 266         iounmap((void __iomem *) amd_irongate_private.registers);
 267 }
 268
 269 /*
 270  * This routine could be implemented by taking the addresses
 271  * written to the GATT, and flushing them individually.  However
 272  * currently it just flushes the whole table.  Which is probably
 273  * more efficent, since agp_memory blocks can be a large number of
 274  * entries.
 275  */
 276
 277 static void amd_irongate_tlbflush(struct agp_memory *temp)
 278 {
 279         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 280         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting. */
 281 }
 282
 283 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
 284 {
 285         int i, j, num_entries;
 286         unsigned long __iomem *cur_gatt;
 287         unsigned long addr;
 288
 289         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 290
 291         if (type != 0 || mem->type != 0)
 292                 return -EINVAL;
 293
 294         if ((pg_start + mem->page_count) > num_entries)
 295                 return -EINVAL;
 296
 297         j = pg_start;
 298         while (j < (pg_start + mem->page_count)) {
 299                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 300                 cur_gatt = GET_GATT(addr);
 301                 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
 302                         return -EBUSY;
 303                 j++;
 304         }
 305
 306         if (mem->is_flushed == FALSE) {
 307                 global_cache_flush();
 308                 mem->is_flushed = TRUE;
 309         }
 310
 311         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 312                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 313                 cur_gatt = GET_GATT(addr);
 314                 writel(agp_generic_mask_memory(agp_bridge,
 315                         mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
 316                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 317         }
 318         amd_irongate_tlbflush(mem);
 319         return 0;
 320 }
 321
 322 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 323 {
 324         int i;
 325         unsigned long __iomem *cur_gatt;
 326         unsigned long addr;
 327
 328         if (type != 0 || mem->type != 0)
 329                 return -EINVAL;
 330
 331         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 332                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 333                 cur_gatt = GET_GATT(addr);
 334                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 335                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 336         }
 337
 338         amd_irongate_tlbflush(mem);
 339         return 0;
 340 }
 341
 342 static struct aper_size_info_lvl2 amd_irongate_sizes[7] =
 343 {
 344         {2048, 524288, 0x0000000c},
 345         {1024, 262144, 0x0000000a},
 346         {512, 131072, 0x00000008},
 347         {256, 65536, 0x00000006},
 348         {128, 32768, 0x00000004},
 349         {64, 16384, 0x00000002},
 350         {32, 8192, 0x00000000}
 351 };
 352
 353 static struct gatt_mask amd_irongate_masks[] =
 354 {
 355         {.mask = 1, .type = 0}
 356 };
 357
 358 static struct agp_bridge_driver amd_irongate_driver = {
 359         .owner                  = THIS_MODULE,
 360         .aperture_sizes         = amd_irongate_sizes,
 361         .size_type              = LVL2_APER_SIZE,
 362         .num_aperture_sizes     = 7,
 363         .configure              = amd_irongate_configure,
 364         .fetch_size             = amd_irongate_fetch_size,
 365         .cleanup                = amd_irongate_cleanup,
 366         .tlb_flush              = amd_irongate_tlbflush,
 367         .mask_memory            = agp_generic_mask_memory,
 368         .masks                  = amd_irongate_masks,
 369         .agp_enable             = agp_generic_enable,
 370         .cache_flush            = global_cache_flush,
 371         .create_gatt_table      = amd_create_gatt_table,
 372         .free_gatt_table        = amd_free_gatt_table,
 373         .insert_memory          = amd_insert_memory,
 374         .remove_memory          = amd_remove_memory,
 375         .alloc_by_type          = agp_generic_alloc_by_type,
 376         .free_by_type           = agp_generic_free_by_type,
 377         .agp_alloc_page         = agp_generic_alloc_page,
 378         .agp_destroy_page       = agp_generic_destroy_page,
 379 };
 380
 381 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
 382 {
 383         {
 384                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 385                 .chipset_name   = "Irongate",
 386         },
 387         {
 388                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 389                 .chipset_name   = "761",
 390         },
 391         {
 392                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 393                 .chipset_name   = "760MP",
 394         },
 395         { }, /* dummy final entry, always present */
 396 };
 397
 398 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
 399                                      const struct pci_device_id *ent)
 400 {
 401         struct agp_bridge_data *bridge;
 402         u8 cap_ptr;
 403         int j;
 404
 405         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 406         if (!cap_ptr)
 407                 return -ENODEV;
 408
 409         j = ent - agp_amdk7_pci_table;
 410         printk(KERN_INFO PFX "Detected AMD %s chipset\n",
 411                amd_agp_device_ids[j].chipset_name);
 412
 413         bridge = agp_alloc_bridge();
 414         if (!bridge)
 415                 return -ENOMEM;
 416
 417         bridge->driver = &amd_irongate_driver;
 418         bridge->dev_private_data = &amd_irongate_private,
 419         bridge->dev = pdev;
 420         bridge->capndx = cap_ptr;
 421
 422         /* 751 Errata (22564_B-1.PDF)
 423            erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
 424            system controller may experience noise due to strong drive strengths
 425          */
 426         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
 427                 u8 cap_ptr=0;
 428                 struct pci_dev *gfxcard=NULL;
 429                 while (!cap_ptr) {
 430                         gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
 431                         if (!gfxcard) {
 432                                 printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
 433                                 return -ENODEV;
 434                         }
 435                         cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
 436                         if (!cap_ptr) {
 437                                 pci_dev_put(gfxcard);
 438                                 continue;
 439                         }
 440                 }
 441
 442                 /* With so many variants of NVidia cards, it's simpler just
 443                    to blacklist them all, and then whitelist them as needed
 444                    (if necessary at all). */
 445                 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
 446                         agp_bridge->flags |= AGP_ERRATA_1X;
 447                         printk (KERN_INFO PFX "AMD 751 chipset with NVidia GeForce detected. Forcing to 1X due to errata.\n");
 448                 }
 449                 pci_dev_put(gfxcard);
 450         }
 451
 452         /* 761 Errata (23613_F.pdf)
 453          * Revisions B0/B1 were a disaster.
 454          * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
 455          * erratum 45: Timing problem prevents fast writes -- Disable fast write.
 456          * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
 457          * With this lot disabled, we should prevent lockups. */
 458         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
 459                 u8 revision=0;
 460                 pci_read_config_byte(pdev, PCI_REVISION_ID, &revision);
 461                 if (revision == 0x10 || revision == 0x11) {
 462                         agp_bridge->flags = AGP_ERRATA_FASTWRITES;
 463                         agp_bridge->flags |= AGP_ERRATA_SBA;
 464                         agp_bridge->flags |= AGP_ERRATA_1X;
 465                         printk (KERN_INFO PFX "AMD 761 chipset with errata detected - disabling AGP fast writes & SBA and forcing to 1X.\n");
 466                 }
 467         }
 468
 469         /* Fill in the mode register */
 470         pci_read_config_dword(pdev,
 471                         bridge->capndx+PCI_AGP_STATUS,
 472                         &bridge->mode);
 473
 474         pci_set_drvdata(pdev, bridge);
 475         return agp_add_bridge(bridge);
 476 }
 477
 478 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
 479 {
 480         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 481
 482         agp_remove_bridge(bridge);
 483         agp_put_bridge(bridge);
 484 }
 485
 486 /* must be the same order as name table above */
 487 static struct pci_device_id agp_amdk7_pci_table[] = {
 488         {
 489         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 490         .class_mask     = ~0,
 491         .vendor         = PCI_VENDOR_ID_AMD,
 492         .device         = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 493         .subvendor      = PCI_ANY_ID,
 494         .subdevice      = PCI_ANY_ID,
 495         },
 496         {
 497         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 498         .class_mask     = ~0,
 499         .vendor         = PCI_VENDOR_ID_AMD,
 500         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 501         .subvendor      = PCI_ANY_ID,
 502         .subdevice      = PCI_ANY_ID,
 503         },
 504         {
 505         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 506         .class_mask     = ~0,
 507         .vendor         = PCI_VENDOR_ID_AMD,
 508         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 509         .subvendor      = PCI_ANY_ID,
 510         .subdevice      = PCI_ANY_ID,
 511         },
 512         { }
 513 };
 514
 515 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
 516
 517 static struct pci_driver agp_amdk7_pci_driver = {
 518         .name           = "agpgart-amdk7",
 519         .id_table       = agp_amdk7_pci_table,
 520         .probe          = agp_amdk7_probe,
 521         .remove         = agp_amdk7_remove,
 522 };
 523
 524 static int __init agp_amdk7_init(void)
 525 {
 526         if (agp_off)
 527                 return -EINVAL;
 528         return pci_register_driver(&agp_amdk7_pci_driver);
 529 }
 530
 531 static void __exit agp_amdk7_cleanup(void)
 532 {
 533         pci_unregister_driver(&agp_amdk7_pci_driver);
 534 }
 535
 536 module_init(agp_amdk7_init);
 537 module_exit(agp_amdk7_cleanup);
 538
 539 MODULE_LICENSE("GPL and additional rights");