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