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/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 __iomem *cur_gatt;
 146         unsigned long addr;
 147         int retval;
 148         u32 temp;
 149         int i;
 150
 151         value = A_SIZE_LVL2(agp_bridge->current_size);
 152         retval = amd_create_page_map(&page_dir);
 153         if (retval != 0)
 154                 return retval;
 155
 156         retval = amd_create_gatt_pages(value->num_entries / 1024);
 157         if (retval != 0) {
 158                 amd_free_page_map(&page_dir);
 159                 return retval;
 160         }
 161
 162         agp_bridge->gatt_table_real = (u32 *)page_dir.real;
 163         agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
 164         agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
 165
 166         /* Get the address for the gart region.
 167          * This is a bus address even on the alpha, b/c its
 168          * used to program the agp master not the cpu
 169          */
 170
 171         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
 172         addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 173         agp_bridge->gart_bus_addr = addr;
 174
 175         /* Calculate the agp offset */
 176         for (i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
 177                 writel(virt_to_phys(amd_irongate_private.gatt_pages[i]->real) | 1,
 178                         page_dir.remapped+GET_PAGE_DIR_OFF(addr));
 179                 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));        /* PCI Posting. */
 180         }
 181
 182         for (i = 0; i < value->num_entries; i++) {
 183                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 184                 cur_gatt = GET_GATT(addr);
 185                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 186                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int amd_free_gatt_table(struct agp_bridge_data *bridge)
 193 {
 194         struct amd_page_map page_dir;
 195
 196         page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
 197         page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
 198
 199         amd_free_gatt_pages();
 200         amd_free_page_map(&page_dir);
 201         return 0;
 202 }
 203
 204 static int amd_irongate_fetch_size(void)
 205 {
 206         int i;
 207         u32 temp;
 208         struct aper_size_info_lvl2 *values;
 209
 210         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 211         temp = (temp & 0x0000000e);
 212         values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
 213         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 214                 if (temp == values[i].size_value) {
 215                         agp_bridge->previous_size =
 216                             agp_bridge->current_size = (void *) (values + i);
 217
 218                         agp_bridge->aperture_size_idx = i;
 219                         return values[i].size;
 220                 }
 221         }
 222
 223         return 0;
 224 }
 225
 226 static int amd_irongate_configure(void)
 227 {
 228         struct aper_size_info_lvl2 *current_size;
 229         u32 temp;
 230         u16 enable_reg;
 231
 232         current_size = A_SIZE_LVL2(agp_bridge->current_size);
 233
 234         if (!amd_irongate_private.registers) {
 235                 /* Get the memory mapped registers */
 236                 pci_read_config_dword(agp_bridge->dev, AMD_MMBASE, &temp);
 237                 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 238                 amd_irongate_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 239                 if (!amd_irongate_private.registers)
 240                         return -ENOMEM;
 241         }
 242
 243         /* Write out the address of the gatt table */
 244         writel(agp_bridge->gatt_bus_addr, amd_irongate_private.registers+AMD_ATTBASE);
 245         readl(amd_irongate_private.registers+AMD_ATTBASE);      /* PCI Posting. */
 246
 247         /* Write the Sync register */
 248         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL, 0x80);
 249
 250         /* Set indexing mode */
 251         pci_write_config_byte(agp_bridge->dev, AMD_MODECNTL2, 0x00);
 252
 253         /* Write the enable register */
 254         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 255         enable_reg = (enable_reg | 0x0004);
 256         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 257         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 258
 259         /* Write out the size register */
 260         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 261         temp = (((temp & ~(0x0000000e)) | current_size->size_value) | 1);
 262         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 263
 264         /* Flush the tlb */
 265         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 266         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting.*/
 267         return 0;
 268 }
 269
 270 static void amd_irongate_cleanup(void)
 271 {
 272         struct aper_size_info_lvl2 *previous_size;
 273         u32 temp;
 274         u16 enable_reg;
 275
 276         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
 277
 278         enable_reg = readw(amd_irongate_private.registers+AMD_GARTENABLE);
 279         enable_reg = (enable_reg & ~(0x0004));
 280         writew(enable_reg, amd_irongate_private.registers+AMD_GARTENABLE);
 281         readw(amd_irongate_private.registers+AMD_GARTENABLE);   /* PCI Posting. */
 282
 283         /* Write back the previous size and disable gart translation */
 284         pci_read_config_dword(agp_bridge->dev, AMD_APSIZE, &temp);
 285         temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 286         pci_write_config_dword(agp_bridge->dev, AMD_APSIZE, temp);
 287         iounmap((void __iomem *) amd_irongate_private.registers);
 288 }
 289
 290 /*
 291  * This routine could be implemented by taking the addresses
 292  * written to the GATT, and flushing them individually.  However
 293  * currently it just flushes the whole table.  Which is probably
 294  * more efficent, since agp_memory blocks can be a large number of
 295  * entries.
 296  */
 297
 298 static void amd_irongate_tlbflush(struct agp_memory *temp)
 299 {
 300         writel(1, amd_irongate_private.registers+AMD_TLBFLUSH);
 301         readl(amd_irongate_private.registers+AMD_TLBFLUSH);     /* PCI Posting. */
 302 }
 303
 304 static int amd_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
 305 {
 306         int i, j, num_entries;
 307         unsigned long __iomem *cur_gatt;
 308         unsigned long addr;
 309
 310         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 311
 312         if (type != 0 || mem->type != 0)
 313                 return -EINVAL;
 314
 315         if ((pg_start + mem->page_count) > num_entries)
 316                 return -EINVAL;
 317
 318         j = pg_start;
 319         while (j < (pg_start + mem->page_count)) {
 320                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 321                 cur_gatt = GET_GATT(addr);
 322                 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
 323                         return -EBUSY;
 324                 j++;
 325         }
 326
 327         if (!mem->is_flushed) {
 328                 global_cache_flush();
 329                 mem->is_flushed = true;
 330         }
 331
 332         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 333                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 334                 cur_gatt = GET_GATT(addr);
 335                 writel(agp_generic_mask_memory(agp_bridge,
 336                                                page_to_phys(mem->pages[i]),
 337                                                mem->type),
 338                        cur_gatt+GET_GATT_OFF(addr));
 339                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 340         }
 341         amd_irongate_tlbflush(mem);
 342         return 0;
 343 }
 344
 345 static int amd_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
 346 {
 347         int i;
 348         unsigned long __iomem *cur_gatt;
 349         unsigned long addr;
 350
 351         if (type != 0 || mem->type != 0)
 352                 return -EINVAL;
 353
 354         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 355                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 356                 cur_gatt = GET_GATT(addr);
 357                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 358                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 359         }
 360
 361         amd_irongate_tlbflush(mem);
 362         return 0;
 363 }
 364
 365 static const struct aper_size_info_lvl2 amd_irongate_sizes[7] =
 366 {
 367         {2048, 524288, 0x0000000c},
 368         {1024, 262144, 0x0000000a},
 369         {512, 131072, 0x00000008},
 370         {256, 65536, 0x00000006},
 371         {128, 32768, 0x00000004},
 372         {64, 16384, 0x00000002},
 373         {32, 8192, 0x00000000}
 374 };
 375
 376 static const struct gatt_mask amd_irongate_masks[] =
 377 {
 378         {.mask = 1, .type = 0}
 379 };
 380
 381 static const struct agp_bridge_driver amd_irongate_driver = {
 382         .owner                  = THIS_MODULE,
 383         .aperture_sizes         = amd_irongate_sizes,
 384         .size_type              = LVL2_APER_SIZE,
 385         .num_aperture_sizes     = 7,
 386         .needs_scratch_page     = true,
 387         .configure              = amd_irongate_configure,
 388         .fetch_size             = amd_irongate_fetch_size,
 389         .cleanup                = amd_irongate_cleanup,
 390         .tlb_flush              = amd_irongate_tlbflush,
 391         .mask_memory            = agp_generic_mask_memory,
 392         .masks                  = amd_irongate_masks,
 393         .agp_enable             = agp_generic_enable,
 394         .cache_flush            = global_cache_flush,
 395         .create_gatt_table      = amd_create_gatt_table,
 396         .free_gatt_table        = amd_free_gatt_table,
 397         .insert_memory          = amd_insert_memory,
 398         .remove_memory          = amd_remove_memory,
 399         .alloc_by_type          = agp_generic_alloc_by_type,
 400         .free_by_type           = agp_generic_free_by_type,
 401         .agp_alloc_page         = agp_generic_alloc_page,
 402         .agp_alloc_pages        = agp_generic_alloc_pages,
 403         .agp_destroy_page       = agp_generic_destroy_page,
 404         .agp_destroy_pages      = agp_generic_destroy_pages,
 405         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 406 };
 407
 408 static struct agp_device_ids amd_agp_device_ids[] __devinitdata =
 409 {
 410         {
 411                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 412                 .chipset_name   = "Irongate",
 413         },
 414         {
 415                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 416                 .chipset_name   = "761",
 417         },
 418         {
 419                 .device_id      = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 420                 .chipset_name   = "760MP",
 421         },
 422         { }, /* dummy final entry, always present */
 423 };
 424
 425 static int __devinit agp_amdk7_probe(struct pci_dev *pdev,
 426                                      const struct pci_device_id *ent)
 427 {
 428         struct agp_bridge_data *bridge;
 429         u8 cap_ptr;
 430         int j;
 431
 432         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 433         if (!cap_ptr)
 434                 return -ENODEV;
 435
 436         j = ent - agp_amdk7_pci_table;
 437         dev_info(&pdev->dev, "AMD %s chipset\n",
 438                  amd_agp_device_ids[j].chipset_name);
 439
 440         bridge = agp_alloc_bridge();
 441         if (!bridge)
 442                 return -ENOMEM;
 443
 444         bridge->driver = &amd_irongate_driver;
 445         bridge->dev_private_data = &amd_irongate_private,
 446         bridge->dev = pdev;
 447         bridge->capndx = cap_ptr;
 448
 449         /* 751 Errata (22564_B-1.PDF)
 450            erratum 20: strobe glitch with Nvidia NV10 GeForce cards.
 451            system controller may experience noise due to strong drive strengths
 452          */
 453         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_7006) {
 454                 struct pci_dev *gfxcard=NULL;
 455
 456                 cap_ptr = 0;
 457                 while (!cap_ptr) {
 458                         gfxcard = pci_get_class(PCI_CLASS_DISPLAY_VGA<<8, gfxcard);
 459                         if (!gfxcard) {
 460                                 dev_info(&pdev->dev, "no AGP VGA controller\n");
 461                                 return -ENODEV;
 462                         }
 463                         cap_ptr = pci_find_capability(gfxcard, PCI_CAP_ID_AGP);
 464                 }
 465
 466                 /* With so many variants of NVidia cards, it's simpler just
 467                    to blacklist them all, and then whitelist them as needed
 468                    (if necessary at all). */
 469                 if (gfxcard->vendor == PCI_VENDOR_ID_NVIDIA) {
 470                         agp_bridge->flags |= AGP_ERRATA_1X;
 471                         dev_info(&pdev->dev, "AMD 751 chipset with NVidia GeForce; forcing 1X due to errata\n");
 472                 }
 473                 pci_dev_put(gfxcard);
 474         }
 475
 476         /* 761 Errata (23613_F.pdf)
 477          * Revisions B0/B1 were a disaster.
 478          * erratum 44: SYSCLK/AGPCLK skew causes 2X failures -- Force mode to 1X
 479          * erratum 45: Timing problem prevents fast writes -- Disable fast write.
 480          * erratum 46: Setup violation on AGP SBA pins - Disable side band addressing.
 481          * With this lot disabled, we should prevent lockups. */
 482         if (agp_bridge->dev->device == PCI_DEVICE_ID_AMD_FE_GATE_700E) {
 483                 if (pdev->revision == 0x10 || pdev->revision == 0x11) {
 484                         agp_bridge->flags = AGP_ERRATA_FASTWRITES;
 485                         agp_bridge->flags |= AGP_ERRATA_SBA;
 486                         agp_bridge->flags |= AGP_ERRATA_1X;
 487                         dev_info(&pdev->dev, "AMD 761 chipset with errata; disabling AGP fast writes & SBA and forcing to 1X\n");
 488                 }
 489         }
 490
 491         /* Fill in the mode register */
 492         pci_read_config_dword(pdev,
 493                         bridge->capndx+PCI_AGP_STATUS,
 494                         &bridge->mode);
 495
 496         pci_set_drvdata(pdev, bridge);
 497         return agp_add_bridge(bridge);
 498 }
 499
 500 static void __devexit agp_amdk7_remove(struct pci_dev *pdev)
 501 {
 502         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 503
 504         agp_remove_bridge(bridge);
 505         agp_put_bridge(bridge);
 506 }
 507
 508 #ifdef CONFIG_PM
 509
 510 static int agp_amdk7_suspend(struct pci_dev *pdev, pm_message_t state)
 511 {
 512         pci_save_state(pdev);
 513         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 514
 515         return 0;
 516 }
 517
 518 static int agp_amdk7_resume(struct pci_dev *pdev)
 519 {
 520         pci_set_power_state(pdev, PCI_D0);
 521         pci_restore_state(pdev);
 522
 523         return amd_irongate_driver.configure();
 524 }
 525
 526 #endif /* CONFIG_PM */
 527
 528 /* must be the same order as name table above */
 529 static struct pci_device_id agp_amdk7_pci_table[] = {
 530         {
 531         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 532         .class_mask     = ~0,
 533         .vendor         = PCI_VENDOR_ID_AMD,
 534         .device         = PCI_DEVICE_ID_AMD_FE_GATE_7006,
 535         .subvendor      = PCI_ANY_ID,
 536         .subdevice      = PCI_ANY_ID,
 537         },
 538         {
 539         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 540         .class_mask     = ~0,
 541         .vendor         = PCI_VENDOR_ID_AMD,
 542         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700E,
 543         .subvendor      = PCI_ANY_ID,
 544         .subdevice      = PCI_ANY_ID,
 545         },
 546         {
 547         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 548         .class_mask     = ~0,
 549         .vendor         = PCI_VENDOR_ID_AMD,
 550         .device         = PCI_DEVICE_ID_AMD_FE_GATE_700C,
 551         .subvendor      = PCI_ANY_ID,
 552         .subdevice      = PCI_ANY_ID,
 553         },
 554         { }
 555 };
 556
 557 MODULE_DEVICE_TABLE(pci, agp_amdk7_pci_table);
 558
 559 static struct pci_driver agp_amdk7_pci_driver = {
 560         .name           = "agpgart-amdk7",
 561         .id_table       = agp_amdk7_pci_table,
 562         .probe          = agp_amdk7_probe,
 563         .remove         = agp_amdk7_remove,
 564 #ifdef CONFIG_PM
 565         .suspend        = agp_amdk7_suspend,
 566         .resume         = agp_amdk7_resume,
 567 #endif
 568 };
 569
 570 static int __init agp_amdk7_init(void)
 571 {
 572         if (agp_off)
 573                 return -EINVAL;
 574         return pci_register_driver(&agp_amdk7_pci_driver);
 575 }
 576
 577 static void __exit agp_amdk7_cleanup(void)
 578 {
 579         pci_unregister_driver(&agp_amdk7_pci_driver);
 580 }
 581
 582 module_init(agp_amdk7_init);
 583 module_exit(agp_amdk7_cleanup);
 584
 585 MODULE_LICENSE("GPL and additional rights");