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/agp_backend.h> 11 #include "agp.h" 12 13 #define SVWRKS_COMMAND 0x04 14 #define SVWRKS_APSIZE 0x10 15 #define SVWRKS_MMBASE 0x14 16 #define SVWRKS_CACHING 0x4b 17 #define SVWRKS_AGP_ENABLE 0x60 18 #define SVWRKS_FEATURE 0x68 19 20 #define SVWRKS_SIZE_MASK 0xfe000000 21 22 /* Memory mapped registers */ 23 #define SVWRKS_GART_CACHE 0x02 24 #define SVWRKS_GATTBASE 0x04 25 #define SVWRKS_TLBFLUSH 0x10 26 #define SVWRKS_POSTFLUSH 0x14 27 #define SVWRKS_DIRFLUSH 0x0c 28 29 30 struct serverworks_page_map { 31 unsigned long *real; 32 unsigned long __iomem *remapped; 33 }; 34 35 static struct _serverworks_private { 36 struct pci_dev *svrwrks_dev; /* device one */ 37 volatile u8 __iomem *registers; 38 struct serverworks_page_map **gatt_pages; 39 int num_tables; 40 struct serverworks_page_map scratch_dir; 41 42 int gart_addr_ofs; 43 int mm_addr_ofs; 44 } serverworks_private; 45 46 static int serverworks_create_page_map(struct serverworks_page_map *page_map) 47 { 48 int i; 49 50 page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL); 51 if (page_map->real == NULL) { 52 return -ENOMEM; 53 } 54 SetPageReserved(virt_to_page(page_map->real)); 55 global_cache_flush(); 56 page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real), 57 PAGE_SIZE); 58 if (page_map->remapped == NULL) { 59 ClearPageReserved(virt_to_page(page_map->real)); 60 free_page((unsigned long) page_map->real); 61 page_map->real = NULL; 62 return -ENOMEM; 63 } 64 global_cache_flush(); 65 66 for(i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) 67 writel(agp_bridge->scratch_page, page_map->remapped+i); 68 69 return 0; 70 } 71 72 static void serverworks_free_page_map(struct serverworks_page_map *page_map) 73 { 74 iounmap(page_map->remapped); 75 ClearPageReserved(virt_to_page(page_map->real)); 76 free_page((unsigned long) page_map->real); 77 } 78 79 static void serverworks_free_gatt_pages(void) 80 { 81 int i; 82 struct serverworks_page_map **tables; 83 struct serverworks_page_map *entry; 84 85 tables = serverworks_private.gatt_pages; 86 for(i = 0; i < serverworks_private.num_tables; i++) { 87 entry = tables[i]; 88 if (entry != NULL) { 89 if (entry->real != NULL) { 90 serverworks_free_page_map(entry); 91 } 92 kfree(entry); 93 } 94 } 95 kfree(tables); 96 } 97 98 static int serverworks_create_gatt_pages(int nr_tables) 99 { 100 struct serverworks_page_map **tables; 101 struct serverworks_page_map *entry; 102 int retval = 0; 103 int i; 104 105 tables = kzalloc((nr_tables + 1) * sizeof(struct serverworks_page_map *), 106 GFP_KERNEL); 107 if (tables == NULL) 108 return -ENOMEM; 109 110 for (i = 0; i < nr_tables; i++) { 111 entry = kzalloc(sizeof(struct serverworks_page_map), GFP_KERNEL); 112 if (entry == NULL) { 113 retval = -ENOMEM; 114 break; 115 } 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_gart(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_gart(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_gart(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 unsigned long timeout; 246 247 writeb(1, serverworks_private.registers+SVWRKS_POSTFLUSH); 248 timeout = jiffies + 3*HZ; 249 while (readb(serverworks_private.registers+SVWRKS_POSTFLUSH) == 1) { 250 cpu_relax(); 251 if (time_after(jiffies, timeout)) { 252 printk(KERN_ERR PFX "TLB post flush took more than 3 seconds\n"); 253 break; 254 } 255 } 256 257 writel(1, serverworks_private.registers+SVWRKS_DIRFLUSH); 258 timeout = jiffies + 3*HZ; 259 while (readl(serverworks_private.registers+SVWRKS_DIRFLUSH) == 1) { 260 cpu_relax(); 261 if (time_after(jiffies, timeout)) { 262 printk(KERN_ERR PFX "TLB Dir flush took more than 3 seconds\n"); 263 break; 264 } 265 } 266 } 267 268 static int serverworks_configure(void) 269 { 270 struct aper_size_info_lvl2 *current_size; 271 u32 temp; 272 u8 enable_reg; 273 u16 cap_reg; 274 275 current_size = A_SIZE_LVL2(agp_bridge->current_size); 276 277 /* Get the memory mapped registers */ 278 pci_read_config_dword(agp_bridge->dev, serverworks_private.mm_addr_ofs, &temp); 279 temp = (temp & PCI_BASE_ADDRESS_MEM_MASK); 280 serverworks_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096); 281 if (!serverworks_private.registers) { 282 printk (KERN_ERR PFX "Unable to ioremap() memory.\n"); 283 return -ENOMEM; 284 } 285 286 writeb(0xA, serverworks_private.registers+SVWRKS_GART_CACHE); 287 readb(serverworks_private.registers+SVWRKS_GART_CACHE); /* PCI Posting. */ 288 289 writel(agp_bridge->gatt_bus_addr, serverworks_private.registers+SVWRKS_GATTBASE); 290 readl(serverworks_private.registers+SVWRKS_GATTBASE); /* PCI Posting. */ 291 292 cap_reg = readw(serverworks_private.registers+SVWRKS_COMMAND); 293 cap_reg &= ~0x0007; 294 cap_reg |= 0x4; 295 writew(cap_reg, serverworks_private.registers+SVWRKS_COMMAND); 296 readw(serverworks_private.registers+SVWRKS_COMMAND); 297 298 pci_read_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, &enable_reg); 299 enable_reg |= 0x1; /* Agp Enable bit */ 300 pci_write_config_byte(serverworks_private.svrwrks_dev,SVWRKS_AGP_ENABLE, enable_reg); 301 serverworks_tlbflush(NULL); 302 303 agp_bridge->capndx = pci_find_capability(serverworks_private.svrwrks_dev, PCI_CAP_ID_AGP); 304 305 /* Fill in the mode register */ 306 pci_read_config_dword(serverworks_private.svrwrks_dev, 307 agp_bridge->capndx+PCI_AGP_STATUS, &agp_bridge->mode); 308 309 pci_read_config_byte(agp_bridge->dev, SVWRKS_CACHING, &enable_reg); 310 enable_reg &= ~0x3; 311 pci_write_config_byte(agp_bridge->dev, SVWRKS_CACHING, enable_reg); 312 313 pci_read_config_byte(agp_bridge->dev, SVWRKS_FEATURE, &enable_reg); 314 enable_reg |= (1<<6); 315 pci_write_config_byte(agp_bridge->dev,SVWRKS_FEATURE, enable_reg); 316 317 return 0; 318 } 319 320 static void serverworks_cleanup(void) 321 { 322 iounmap((void __iomem *) serverworks_private.registers); 323 } 324 325 static int serverworks_insert_memory(struct agp_memory *mem, 326 off_t pg_start, int type) 327 { 328 int i, j, num_entries; 329 unsigned long __iomem *cur_gatt; 330 unsigned long addr; 331 332 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries; 333 334 if (type != 0 || mem->type != 0) { 335 return -EINVAL; 336 } 337 if ((pg_start + mem->page_count) > num_entries) { 338 return -EINVAL; 339 } 340 341 j = pg_start; 342 while (j < (pg_start + mem->page_count)) { 343 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr; 344 cur_gatt = SVRWRKS_GET_GATT(addr); 345 if (!PGE_EMPTY(agp_bridge, readl(cur_gatt+GET_GATT_OFF(addr)))) 346 return -EBUSY; 347 j++; 348 } 349 350 if (mem->is_flushed == FALSE) { 351 global_cache_flush(); 352 mem->is_flushed = TRUE; 353 } 354 355 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) { 356 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr; 357 cur_gatt = SVRWRKS_GET_GATT(addr); 358 writel(agp_bridge->driver->mask_memory(agp_bridge, mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr)); 359 } 360 serverworks_tlbflush(mem); 361 return 0; 362 } 363 364 static int serverworks_remove_memory(struct agp_memory *mem, off_t pg_start, 365 int type) 366 { 367 int i; 368 unsigned long __iomem *cur_gatt; 369 unsigned long addr; 370 371 if (type != 0 || mem->type != 0) { 372 return -EINVAL; 373 } 374 375 global_cache_flush(); 376 serverworks_tlbflush(mem); 377 378 for (i = pg_start; i < (mem->page_count + pg_start); i++) { 379 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr; 380 cur_gatt = SVRWRKS_GET_GATT(addr); 381 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr)); 382 } 383 384 serverworks_tlbflush(mem); 385 return 0; 386 } 387 388 static struct gatt_mask serverworks_masks[] = 389 { 390 {.mask = 1, .type = 0} 391 }; 392 393 static struct aper_size_info_lvl2 serverworks_sizes[7] = 394 { 395 {2048, 524288, 0x80000000}, 396 {1024, 262144, 0xc0000000}, 397 {512, 131072, 0xe0000000}, 398 {256, 65536, 0xf0000000}, 399 {128, 32768, 0xf8000000}, 400 {64, 16384, 0xfc000000}, 401 {32, 8192, 0xfe000000} 402 }; 403 404 static void serverworks_agp_enable(struct agp_bridge_data *bridge, u32 mode) 405 { 406 u32 command; 407 408 pci_read_config_dword(serverworks_private.svrwrks_dev, 409 bridge->capndx + PCI_AGP_STATUS, 410 &command); 411 412 command = agp_collect_device_status(bridge, mode, command); 413 414 command &= ~0x10; /* disable FW */ 415 command &= ~0x08; 416 417 command |= 0x100; 418 419 pci_write_config_dword(serverworks_private.svrwrks_dev, 420 bridge->capndx + PCI_AGP_COMMAND, 421 command); 422 423 agp_device_command(command, 0); 424 } 425 426 static struct agp_bridge_driver sworks_driver = { 427 .owner = THIS_MODULE, 428 .aperture_sizes = serverworks_sizes, 429 .size_type = LVL2_APER_SIZE, 430 .num_aperture_sizes = 7, 431 .configure = serverworks_configure, 432 .fetch_size = serverworks_fetch_size, 433 .cleanup = serverworks_cleanup, 434 .tlb_flush = serverworks_tlbflush, 435 .mask_memory = agp_generic_mask_memory, 436 .masks = serverworks_masks, 437 .agp_enable = serverworks_agp_enable, 438 .cache_flush = global_cache_flush, 439 .create_gatt_table = serverworks_create_gatt_table, 440 .free_gatt_table = serverworks_free_gatt_table, 441 .insert_memory = serverworks_insert_memory, 442 .remove_memory = serverworks_remove_memory, 443 .alloc_by_type = agp_generic_alloc_by_type, 444 .free_by_type = agp_generic_free_by_type, 445 .agp_alloc_page = agp_generic_alloc_page, 446 .agp_destroy_page = agp_generic_destroy_page, 447 }; 448 449 static int __devinit agp_serverworks_probe(struct pci_dev *pdev, 450 const struct pci_device_id *ent) 451 { 452 struct agp_bridge_data *bridge; 453 struct pci_dev *bridge_dev; 454 u32 temp, temp2; 455 u8 cap_ptr = 0; 456 457 /* Everything is on func 1 here so we are hardcoding function one */ 458 bridge_dev = pci_find_slot((unsigned int)pdev->bus->number, 459 PCI_DEVFN(0, 1)); 460 if (!bridge_dev) { 461 printk(KERN_INFO PFX "Detected a Serverworks chipset " 462 "but could not find the secondary device.\n"); 463 return -ENODEV; 464 } 465 466 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP); 467 468 switch (pdev->device) { 469 case 0x0006: 470 /* ServerWorks CNB20HE 471 Fail silently.*/ 472 printk (KERN_ERR PFX "Detected ServerWorks CNB20HE chipset: No AGP present.\n"); 473 return -ENODEV; 474 475 case PCI_DEVICE_ID_SERVERWORKS_HE: 476 case PCI_DEVICE_ID_SERVERWORKS_LE: 477 case 0x0007: 478 break; 479 480 default: 481 if (cap_ptr) 482 printk(KERN_ERR PFX "Unsupported Serverworks chipset " 483 "(device id: %04x)\n", pdev->device); 484 return -ENODEV; 485 } 486 487 serverworks_private.svrwrks_dev = bridge_dev; 488 serverworks_private.gart_addr_ofs = 0x10; 489 490 pci_read_config_dword(pdev, SVWRKS_APSIZE, &temp); 491 if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) { 492 pci_read_config_dword(pdev, SVWRKS_APSIZE + 4, &temp2); 493 if (temp2 != 0) { 494 printk(KERN_INFO PFX "Detected 64 bit aperture address, " 495 "but top bits are not zero. Disabling agp\n"); 496 return -ENODEV; 497 } 498 serverworks_private.mm_addr_ofs = 0x18; 499 } else 500 serverworks_private.mm_addr_ofs = 0x14; 501 502 pci_read_config_dword(pdev, serverworks_private.mm_addr_ofs, &temp); 503 if (temp & PCI_BASE_ADDRESS_MEM_TYPE_64) { 504 pci_read_config_dword(pdev, 505 serverworks_private.mm_addr_ofs + 4, &temp2); 506 if (temp2 != 0) { 507 printk(KERN_INFO PFX "Detected 64 bit MMIO address, " 508 "but top bits are not zero. Disabling agp\n"); 509 return -ENODEV; 510 } 511 } 512 513 bridge = agp_alloc_bridge(); 514 if (!bridge) 515 return -ENOMEM; 516 517 bridge->driver = &sworks_driver; 518 bridge->dev_private_data = &serverworks_private, 519 bridge->dev = pdev; 520 521 pci_set_drvdata(pdev, bridge); 522 return agp_add_bridge(bridge); 523 } 524 525 static void __devexit agp_serverworks_remove(struct pci_dev *pdev) 526 { 527 struct agp_bridge_data *bridge = pci_get_drvdata(pdev); 528 529 agp_remove_bridge(bridge); 530 agp_put_bridge(bridge); 531 } 532 533 static struct pci_device_id agp_serverworks_pci_table[] = { 534 { 535 .class = (PCI_CLASS_BRIDGE_HOST << 8), 536 .class_mask = ~0, 537 .vendor = PCI_VENDOR_ID_SERVERWORKS, 538 .device = PCI_ANY_ID, 539 .subvendor = PCI_ANY_ID, 540 .subdevice = PCI_ANY_ID, 541 }, 542 { } 543 }; 544 545 MODULE_DEVICE_TABLE(pci, agp_serverworks_pci_table); 546 547 static struct pci_driver agp_serverworks_pci_driver = { 548 .name = "agpgart-serverworks", 549 .id_table = agp_serverworks_pci_table, 550 .probe = agp_serverworks_probe, 551 .remove = agp_serverworks_remove, 552 }; 553 554 static int __init agp_serverworks_init(void) 555 { 556 if (agp_off) 557 return -EINVAL; 558 return pci_register_driver(&agp_serverworks_pci_driver); 559 } 560 561 static void __exit agp_serverworks_cleanup(void) 562 { 563 pci_unregister_driver(&agp_serverworks_pci_driver); 564 } 565 566 module_init(agp_serverworks_init); 567 module_exit(agp_serverworks_cleanup); 568 569 MODULE_LICENSE("GPL and additional rights"); 570 571