drivers/char/agp/sworks-agp.c

   1 /*
   2  * Serverworks AGPGART routines.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/pci.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9 #include <linux/slab.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/agp_backend.h>
  12 #include "agp.h"
  13
  14 #define SVWRKS_COMMAND          0x04
  15 #define SVWRKS_APSIZE           0x10
  16 #define SVWRKS_MMBASE           0x14
  17 #define SVWRKS_CACHING          0x4b
  18 #define SVWRKS_AGP_ENABLE       0x60
  19 #define SVWRKS_FEATURE          0x68
  20
  21 #define SVWRKS_SIZE_MASK        0xfe000000
  22
  23 /* Memory mapped registers */
  24 #define SVWRKS_GART_CACHE       0x02
  25 #define SVWRKS_GATTBASE         0x04
  26 #define SVWRKS_TLBFLUSH         0x10
  27 #define SVWRKS_POSTFLUSH        0x14
  28 #define SVWRKS_DIRFLUSH         0x0c
  29
  30
  31 struct serverworks_page_map {
  32         unsigned long *real;
  33         unsigned long __iomem *remapped;
  34 };
  35
  36 static struct _serverworks_private {
  37         struct pci_dev *svrwrks_dev;    /* device one */
  38         volatile u8 __iomem *registers;
  39         struct serverworks_page_map **gatt_pages;
  40         int num_tables;
  41         struct serverworks_page_map scratch_dir;
  42
  43         int gart_addr_ofs;
  44         int mm_addr_ofs;
  45 } serverworks_private;
  46
  47 static int serverworks_create_page_map(struct serverworks_page_map *page_map)
  48 {
  49         int i;
  50
  51         page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
  52         if (page_map->real == NULL) {
  53                 return -ENOMEM;
  54         }
  55
  56         set_memory_uc((unsigned long)page_map->real, 1);
  57         page_map->remapped = page_map->real;
  58
  59         for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++)
  60                 writel(agp_bridge->scratch_page, page_map->remapped+i);
  61                 /* Red Pen: Everyone else does pci posting flush here */
  62
  63         return 0;
  64 }
  65
  66 static void serverworks_free_page_map(struct serverworks_page_map *page_map)
  67 {
  68         set_memory_wb((unsigned long)page_map->real, 1);
  69         free_page((unsigned long) page_map->real);
  70 }
  71
  72 static void serverworks_free_gatt_pages(void)
  73 {
  74         int i;
  75         struct serverworks_page_map **tables;
  76         struct serverworks_page_map *entry;
  77
  78         tables = serverworks_private.gatt_pages;
  79         for (i = 0; i < serverworks_private.num_tables; i++) {
  80                 entry = tables[i];
  81                 if (entry != NULL) {
  82                         if (entry->real != NULL) {
  83                                 serverworks_free_page_map(entry);
  84                         }
  85                         kfree(entry);
  86                 }
  87         }
  88         kfree(tables);
  89 }
  90
  91 static int serverworks_create_gatt_pages(int nr_tables)
  92 {
  93         struct serverworks_page_map **tables;
  94         struct serverworks_page_map *entry;
  95         int retval = 0;
  96         int i;
  97
  98         tables = kzalloc((nr_tables + 1) * sizeof(struct serverworks_page_map *),
  99                          GFP_KERNEL);
 100         if (tables == NULL)
 101                 return -ENOMEM;
 102
 103         for (i = 0; i < nr_tables; i++) {
 104                 entry = kzalloc(sizeof(struct serverworks_page_map), GFP_KERNEL);
 105                 if (entry == NULL) {
 106                         retval = -ENOMEM;
 107                         break;
 108                 }
 109                 tables[i] = entry;
 110                 retval = serverworks_create_page_map(entry);
 111                 if (retval != 0) break;
 112         }
 113         serverworks_private.num_tables = nr_tables;
 114         serverworks_private.gatt_pages = tables;
 115
 116         if (retval != 0) serverworks_free_gatt_pages();
 117
 118         return retval;
 119 }
 120
 121 #define SVRWRKS_GET_GATT(addr) (serverworks_private.gatt_pages[\
 122         GET_PAGE_DIR_IDX(addr)]->remapped)
 123
 124 #ifndef GET_PAGE_DIR_OFF
 125 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
 126 #endif
 127
 128 #ifndef GET_PAGE_DIR_IDX
 129 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
 130         GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
 131 #endif
 132
 133 #ifndef GET_GATT_OFF
 134 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
 135 #endif
 136
 137 static int serverworks_create_gatt_table(struct agp_bridge_data *bridge)
 138 {
 139         struct aper_size_info_lvl2 *value;
 140         struct serverworks_page_map page_dir;
 141         int retval;
 142         u32 temp;
 143         int i;
 144
 145         value = A_SIZE_LVL2(agp_bridge->current_size);
 146         retval = serverworks_create_page_map(&page_dir);
 147         if (retval != 0) {
 148                 return retval;
 149         }
 150         retval = serverworks_create_page_map(&serverworks_private.scratch_dir);
 151         if (retval != 0) {
 152                 serverworks_free_page_map(&page_dir);
 153                 return retval;
 154         }
 155         /* Create a fake scratch directory */
 156         for (i = 0; i < 1024; i++) {
 157                 writel(agp_bridge->scratch_page, serverworks_private.scratch_dir.remapped+i);
 158                 writel(virt_to_phys(serverworks_private.scratch_dir.real) | 1, page_dir.remapped+i);
 159         }
 160
 161         retval = serverworks_create_gatt_pages(value->num_entries / 1024);
 162         if (retval != 0) {
 163                 serverworks_free_page_map(&page_dir);
 164                 serverworks_free_page_map(&serverworks_private.scratch_dir);
 165                 return retval;
 166         }
 167
 168         agp_bridge->gatt_table_real = (u32 *)page_dir.real;
 169         agp_bridge->gatt_table = (u32 __iomem *)page_dir.remapped;
 170         agp_bridge->gatt_bus_addr = virt_to_phys(page_dir.real);
 171
 172         /* Get the address for the gart region.
 173          * This is a bus address even on the alpha, b/c its
 174          * used to program the agp master not the cpu
 175          */
 176
 177         pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp);
 178         agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 179
 180         /* Calculate the agp offset */
 181         for (i = 0; i < value->num_entries / 1024; i++)
 182                 writel(virt_to_phys(serverworks_private.gatt_pages[i]->real)|1, page_dir.remapped+i);
 183
 184         return 0;
 185 }
 186
 187 static int serverworks_free_gatt_table(struct agp_bridge_data *bridge)
 188 {
 189         struct serverworks_page_map page_dir;
 190
 191         page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
 192         page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
 193
 194         serverworks_free_gatt_pages();
 195         serverworks_free_page_map(&page_dir);
 196         serverworks_free_page_map(&serverworks_private.scratch_dir);
 197         return 0;
 198 }
 199
 200 static int serverworks_fetch_size(void)
 201 {
 202         int i;
 203         u32 temp;
 204         u32 temp2;
 205         struct aper_size_info_lvl2 *values;
 206
 207         values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
 208         pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp);
 209         pci_write_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,
 210                                         SVWRKS_SIZE_MASK);
 211         pci_read_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,&temp2);
 212         pci_write_config_dword(agp_bridge->dev,serverworks_private.gart_addr_ofs,temp);
 213         temp2 &= SVWRKS_SIZE_MASK;
 214
 215         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 216                 if (temp2 == values[i].size_value) {
 217                         agp_bridge->previous_size =
 218                             agp_bridge->current_size = (void *) (values + i);
 219
 220                         agp_bridge->aperture_size_idx = i;
 221                         return values[i].size;
 222                 }
 223         }
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * This routine could be implemented by taking the addresses
 230  * written to the GATT, and flushing them individually.  However
 231  * currently it just flushes the whole table.  Which is probably
 232  * more efficient, since agp_memory blocks can be a large number of
 233  * entries.
 234  */
 235 static void serverworks_tlbflush(struct agp_memory *temp)
 236 {
 237         unsigned long timeout;
 238
 239         writeb(1, serverworks_private.registers+SVWRKS_POSTFLUSH);
 240         timeout = jiffies + 3*HZ;
 241         while (readb(serverworks_private.registers+SVWRKS_POSTFLUSH) == 1) {
 242                 cpu_relax();
 243                 if (time_after(jiffies, timeout)) {
 244                         dev_err(&serverworks_private.svrwrks_dev->dev,
 245                                 "TLB post flush took more than 3 seconds\n");
 246                         break;
 247                 }
 248         }
 249
 250         writel(1, serverworks_private.registers+SVWRKS_DIRFLUSH);
 251         timeout = jiffies + 3*HZ;
 252         while (readl(serverworks_private.registers+SVWRKS_DIRFLUSH) == 1) {
 253                 cpu_relax();
 254                 if (time_after(jiffies, timeout)) {
 255                         dev_err(&serverworks_private.svrwrks_dev->dev,
 256                                 "TLB Dir flush took more than 3 seconds\n");
 257                         break;
 258                 }
 259         }
 260 }
 261
 262 static int serverworks_configure(void)
 263 {
 264         struct aper_size_info_lvl2 *current_size;
 265         u32 temp;
 266         u8 enable_reg;
 267         u16 cap_reg;
 268
 269         current_size = A_SIZE_LVL2(agp_bridge->current_size);
 270
 271         /* Get the memory mapped registers */
 272         pci_read_config_dword(agp_bridge->dev, serverworks_private.mm_addr_ofs, &temp);
 273         temp = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 274         serverworks_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 275         if (!serverworks_private.registers) {
 276                 dev_err(&agp_bridge->dev->dev, "can't ioremap(%#x)\n", temp);
 277                 return -ENOMEM;
 278         }
 279
 280         writeb(0xA, serverworks_private.registers+SVWRKS_GART_CACHE);
 281         readb(serverworks_private.registers+SVWRKS_GART_CACHE); /* PCI Posting. */
 282
 283         writel(agp_bridge->gatt_bus_addr, serverworks_private.registers+SVWRKS_GATTBASE);
 284         readl(serverworks_private.registers+SVWRKS_GATTBASE);   /* PCI Posting. */
 285
 286         cap_reg = readw(serverworks_private.registers+SVWRKS_COMMAND);
 287         cap_reg &= ~0x0007;
 288         cap_reg |= 0x4;
 289         writew(cap_reg, serverworks_private.registers+SVWRKS_COMMAND);
 290         readw(serverworks_private.registers+SVWRKS_COMMAND);
 291
 292         pci_read_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, &enable_reg);
 293         enable_reg |= 0x1; /* Agp Enable bit */
 294         pci_write_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, enable_reg);
 295         serverworks_tlbflush(NULL);
 296
 297         agp_bridge->capndx = pci_find_capability(serverworks_private.svrwrks_dev, PCI_CAP_ID_AGP);
 298
 299         /* Fill in the mode register */
 300         pci_read_config_dword(serverworks_private.svrwrks_dev,
 301                               agp_bridge->capndx+PCI_AGP_STATUS, &agp_bridge->mode);
 302
 303         pci_read_config_byte(agp_bridge->dev, SVWRKS_CACHING, &enable_reg);
 304         enable_reg &= ~0x3;
 305         pci_write_config_byte(agp_bridge->dev, SVWRKS_CACHING, enable_reg);
 306
 307         pci_read_config_byte(agp_bridge->dev, SVWRKS_FEATURE, &enable_reg);
 308         enable_reg |= (1<<6);
 309         pci_write_config_byte(agp_bridge->dev,SVWRKS_FEATURE, enable_reg);
 310
 311         return 0;
 312 }
 313
 314 static void serverworks_cleanup(void)
 315 {
 316         iounmap((void __iomem *) serverworks_private.registers);
 317 }
 318
 319 static int serverworks_insert_memory(struct agp_memory *mem,
 320                              off_t pg_start, int type)
 321 {
 322         int i, j, num_entries;
 323         unsigned long __iomem *cur_gatt;
 324         unsigned long addr;
 325
 326         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 327
 328         if (type != 0 || mem->type != 0) {
 329                 return -EINVAL;
 330         }
 331         if ((pg_start + mem->page_count) > num_entries) {
 332                 return -EINVAL;
 333         }
 334
 335         j = pg_start;
 336         while (j < (pg_start + mem->page_count)) {
 337                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 338                 cur_gatt = SVRWRKS_GET_GATT(addr);
 339                 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr))))
 340                         return -EBUSY;
 341                 j++;
 342         }
 343
 344         if (!mem->is_flushed) {
 345                 global_cache_flush();
 346                 mem->is_flushed = true;
 347         }
 348
 349         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 350                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 351                 cur_gatt = SVRWRKS_GET_GATT(addr);
 352                 writel(agp_bridge->driver->mask_memory(agp_bridge,
 353                                 page_to_phys(mem->pages[i]), mem->type),
 354                        cur_gatt+GET_GATT_OFF(addr));
 355         }
 356         serverworks_tlbflush(mem);
 357         return 0;
 358 }
 359
 360 static int serverworks_remove_memory(struct agp_memory *mem, off_t pg_start,
 361                              int type)
 362 {
 363         int i;
 364         unsigned long __iomem *cur_gatt;
 365         unsigned long addr;
 366
 367         if (type != 0 || mem->type != 0) {
 368                 return -EINVAL;
 369         }
 370
 371         global_cache_flush();
 372         serverworks_tlbflush(mem);
 373
 374         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 375                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 376                 cur_gatt = SVRWRKS_GET_GATT(addr);
 377                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 378         }
 379
 380         serverworks_tlbflush(mem);
 381         return 0;
 382 }
 383
 384 static const struct gatt_mask serverworks_masks[] =
 385 {
 386         {.mask = 1, .type = 0}
 387 };
 388
 389 static const struct aper_size_info_lvl2 serverworks_sizes[7] =
 390 {
 391         {2048, 524288, 0x80000000},
 392         {1024, 262144, 0xc0000000},
 393         {512, 131072, 0xe0000000},
 394         {256, 65536, 0xf0000000},
 395         {128, 32768, 0xf8000000},
 396         {64, 16384, 0xfc000000},
 397         {32, 8192, 0xfe000000}
 398 };
 399
 400 static void serverworks_agp_enable(struct agp_bridge_data *bridge, u32 mode)
 401 {
 402         u32 command;
 403
 404         pci_read_config_dword(serverworks_private.svrwrks_dev,
 405                               bridge->capndx + PCI_AGP_STATUS,
 406                               &command);
 407
 408         command = agp_collect_device_status(bridge, mode, command);
 409
 410         command &= ~0x10;       /* disable FW */
 411         command &= ~0x08;
 412
 413         command |= 0x100;
 414
 415         pci_write_config_dword(serverworks_private.svrwrks_dev,
 416                                bridge->capndx + PCI_AGP_COMMAND,
 417                                command);
 418
 419         agp_device_command(command, false);
 420 }
 421
 422 static const struct agp_bridge_driver sworks_driver = {
 423         .owner                  = THIS_MODULE,
 424         .aperture_sizes         = serverworks_sizes,
 425         .size_type              = LVL2_APER_SIZE,
 426         .num_aperture_sizes     = 7,
 427         .configure              = serverworks_configure,
 428         .fetch_size             = serverworks_fetch_size,
 429         .cleanup                = serverworks_cleanup,
 430         .tlb_flush              = serverworks_tlbflush,
 431         .mask_memory            = agp_generic_mask_memory,
 432         .masks                  = serverworks_masks,
 433         .agp_enable             = serverworks_agp_enable,
 434         .cache_flush            = global_cache_flush,
 435         .create_gatt_table      = serverworks_create_gatt_table,
 436         .free_gatt_table        = serverworks_free_gatt_table,
 437         .insert_memory          = serverworks_insert_memory,
 438         .remove_memory          = serverworks_remove_memory,
 439         .alloc_by_type          = agp_generic_alloc_by_type,
 440         .free_by_type           = agp_generic_free_by_type,
 441         .agp_alloc_page         = agp_generic_alloc_page,
 442         .agp_alloc_pages        = agp_generic_alloc_pages,
 443         .agp_destroy_page       = agp_generic_destroy_page,
 444         .agp_destroy_pages      = agp_generic_destroy_pages,
 445         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 446 };
 447
 448 static int agp_serverworks_probe(struct pci_dev *pdev,
 449                                  const struct pci_device_id *ent)
 450 {
 451         struct agp_bridge_data *bridge;
 452         struct pci_dev *bridge_dev;
 453         u32 temp, temp2;
 454         u8 cap_ptr = 0;
 455
 456         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 457
 458         switch (pdev->device) {
 459         case 0x0006:
 460                 dev_err(&pdev->dev, "ServerWorks CNB20HE is unsupported due to lack of documentation\n");
 461                 return -ENODEV;
 462
 463         case PCI_DEVICE_ID_SERVERWORKS_HE:
 464         case PCI_DEVICE_ID_SERVERWORKS_LE:
 465         case 0x0007:
 466                 break;
 467
 468         default:
 469                 if (cap_ptr)
 470                         dev_err(&pdev->dev, "unsupported Serverworks chipset "
 471                                 "[%04x/%04x]\n", pdev->vendor, pdev->device);
 472                 return -ENODEV;
 473         }
 474
 475         /* Everything is on func 1 here so we are hardcoding function one */
 476         bridge_dev = pci_get_bus_and_slot((unsigned int)pdev->bus->number,
 477                         PCI_DEVFN(0, 1));
 478         if (!bridge_dev) {
 479                 dev_info(&pdev->dev, "can't find secondary device\n");
 480                 return -ENODEV;
 481         }
 482
 483         serverworks_private.svrwrks_dev = bridge_dev;
 484         serverworks_private.gart_addr_ofs = 0x10;
 485
 486         pci_read_config_dword(pdev, SVWRKS_APSIZE, &temp);
 487         if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) {
 488                 pci_read_config_dword(pdev, SVWRKS_APSIZE + 4, &temp2);
 489                 if (temp2 != 0) {
 490                         dev_info(&pdev->dev, "64 bit aperture address, "
 491                                  "but top bits are not zero; disabling AGP\n");
 492                         return -ENODEV;
 493                 }
 494                 serverworks_private.mm_addr_ofs = 0x18;
 495         } else
 496                 serverworks_private.mm_addr_ofs = 0x14;
 497
 498         pci_read_config_dword(pdev, serverworks_private.mm_addr_ofs, &temp);
 499         if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) {
 500                 pci_read_config_dword(pdev,
 501                                 serverworks_private.mm_addr_ofs + 4, &temp2);
 502                 if (temp2 != 0) {
 503                         dev_info(&pdev->dev, "64 bit MMIO address, but top "
 504                                  "bits are not zero; disabling AGP\n");
 505                         return -ENODEV;
 506                 }
 507         }
 508
 509         bridge = agp_alloc_bridge();
 510         if (!bridge)
 511                 return -ENOMEM;
 512
 513         bridge->driver = &sworks_driver;
 514         bridge->dev_private_data = &serverworks_private,
 515         bridge->dev = pci_dev_get(pdev);
 516
 517         pci_set_drvdata(pdev, bridge);
 518         return agp_add_bridge(bridge);
 519 }
 520
 521 static void agp_serverworks_remove(struct pci_dev *pdev)
 522 {
 523         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 524
 525         pci_dev_put(bridge->dev);
 526         agp_remove_bridge(bridge);
 527         agp_put_bridge(bridge);
 528         pci_dev_put(serverworks_private.svrwrks_dev);
 529         serverworks_private.svrwrks_dev = NULL;
 530 }
 531
 532 static struct pci_device_id agp_serverworks_pci_table[] = {
 533         {
 534         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 535         .class_mask     = ~0,
 536         .vendor         = PCI_VENDOR_ID_SERVERWORKS,
 537         .device         = PCI_ANY_ID,
 538         .subvendor      = PCI_ANY_ID,
 539         .subdevice      = PCI_ANY_ID,
 540         },
 541         { }
 542 };
 543
 544 MODULE_DEVICE_TABLE(pci, agp_serverworks_pci_table);
 545
 546 static struct pci_driver agp_serverworks_pci_driver = {
 547         .name           = "agpgart-serverworks",
 548         .id_table       = agp_serverworks_pci_table,
 549         .probe          = agp_serverworks_probe,
 550         .remove         = agp_serverworks_remove,
 551 };
 552
 553 static int __init agp_serverworks_init(void)
 554 {
 555         if (agp_off)
 556                 return -EINVAL;
 557         return pci_register_driver(&agp_serverworks_pci_driver);
 558 }
 559
 560 static void __exit agp_serverworks_cleanup(void)
 561 {
 562         pci_unregister_driver(&agp_serverworks_pci_driver);
 563 }
 564
 565 module_init(agp_serverworks_init);
 566 module_exit(agp_serverworks_cleanup);
 567
 568 MODULE_LICENSE("GPL and additional rights");
 569