1 /* 2 * Transmeta's Efficeon AGPGART driver. 3 * 4 * Based upon a diff by Linus around November '02. 5 * 6 * Ported to the 2.6 kernel by Carlos Puchol <cpglinux@puchol.com> 7 * and H. Peter Anvin <hpa@transmeta.com>. 8 */ 9 10 /* 11 * NOTE-cpg-040217: 12 * 13 * - when compiled as a module, after loading the module, 14 * it will refuse to unload, indicating it is in use, 15 * when it is not. 16 * - no s3 (suspend to ram) testing. 17 * - tested on the efficeon integrated nothbridge for tens 18 * of iterations of starting x and glxgears. 19 * - tested with radeon 9000 and radeon mobility m9 cards 20 * - tested with c3/c4 enabled (with the mobility m9 card) 21 */ 22 23 #include <linux/module.h> 24 #include <linux/pci.h> 25 #include <linux/init.h> 26 #include <linux/agp_backend.h> 27 #include <linux/gfp.h> 28 #include <linux/page-flags.h> 29 #include <linux/mm.h> 30 #include "agp.h" 31 #include "intel-agp.h" 32 33 /* 34 * The real differences to the generic AGP code is 35 * in the GART mappings - a two-level setup with the 36 * first level being an on-chip 64-entry table. 37 * 38 * The page array is filled through the ATTPAGE register 39 * (Aperture Translation Table Page Register) at 0xB8. Bits: 40 * 31:20: physical page address 41 * 11:9: Page Attribute Table Index (PATI) 42 * must match the PAT index for the 43 * mapped pages (the 2nd level page table pages 44 * themselves should be just regular WB-cacheable, 45 * so this is normally zero.) 46 * 8: Present 47 * 7:6: reserved, write as zero 48 * 5:0: GATT directory index: which 1st-level entry 49 * 50 * The Efficeon AGP spec requires pages to be WB-cacheable 51 * but to be explicitly CLFLUSH'd after any changes. 52 */ 53 #define EFFICEON_ATTPAGE 0xb8 54 #define EFFICEON_L1_SIZE 64 /* Number of PDE pages */ 55 56 #define EFFICEON_PATI (0 << 9) 57 #define EFFICEON_PRESENT (1 << 8) 58 59 static struct _efficeon_private { 60 unsigned long l1_table[EFFICEON_L1_SIZE]; 61 } efficeon_private; 62 63 static const struct gatt_mask efficeon_generic_masks[] = 64 { 65 {.mask = 0x00000001, .type = 0} 66 }; 67 68 /* This function does the same thing as mask_memory() for this chipset... */ 69 static inline unsigned long efficeon_mask_memory(struct page *page) 70 { 71 unsigned long addr = page_to_phys(page); 72 return addr | 0x00000001; 73 } 74 75 static const struct aper_size_info_lvl2 efficeon_generic_sizes[4] = 76 { 77 {256, 65536, 0}, 78 {128, 32768, 32}, 79 {64, 16384, 48}, 80 {32, 8192, 56} 81 }; 82 83 /* 84 * Control interfaces are largely identical to 85 * the legacy Intel 440BX.. 86 */ 87 88 static int efficeon_fetch_size(void) 89 { 90 int i; 91 u16 temp; 92 struct aper_size_info_lvl2 *values; 93 94 pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp); 95 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes); 96 97 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) { 98 if (temp == values[i].size_value) { 99 agp_bridge->previous_size = 100 agp_bridge->current_size = (void *) (values + i); 101 agp_bridge->aperture_size_idx = i; 102 return values[i].size; 103 } 104 } 105 106 return 0; 107 } 108 109 static void efficeon_tlbflush(struct agp_memory * mem) 110 { 111 printk(KERN_DEBUG PFX "efficeon_tlbflush()\n"); 112 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200); 113 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280); 114 } 115 116 static void efficeon_cleanup(void) 117 { 118 u16 temp; 119 struct aper_size_info_lvl2 *previous_size; 120 121 printk(KERN_DEBUG PFX "efficeon_cleanup()\n"); 122 previous_size = A_SIZE_LVL2(agp_bridge->previous_size); 123 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp); 124 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9)); 125 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, 126 previous_size->size_value); 127 } 128 129 static int efficeon_configure(void) 130 { 131 u16 temp2; 132 struct aper_size_info_lvl2 *current_size; 133 134 printk(KERN_DEBUG PFX "efficeon_configure()\n"); 135 136 current_size = A_SIZE_LVL2(agp_bridge->current_size); 137 138 /* aperture size */ 139 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, 140 current_size->size_value); 141 142 /* address to map to */ 143 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev, 144 AGP_APERTURE_BAR); 145 146 /* agpctrl */ 147 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280); 148 149 /* paccfg/nbxcfg */ 150 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2); 151 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, 152 (temp2 & ~(1 << 10)) | (1 << 9) | (1 << 11)); 153 /* clear any possible error conditions */ 154 pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7); 155 return 0; 156 } 157 158 static int efficeon_free_gatt_table(struct agp_bridge_data *bridge) 159 { 160 int index, freed = 0; 161 162 for (index = 0; index < EFFICEON_L1_SIZE; index++) { 163 unsigned long page = efficeon_private.l1_table[index]; 164 if (page) { 165 efficeon_private.l1_table[index] = 0; 166 free_page(page); 167 freed++; 168 } 169 printk(KERN_DEBUG PFX "efficeon_free_gatt_table(%p, %02x, %08x)\n", 170 agp_bridge->dev, EFFICEON_ATTPAGE, index); 171 pci_write_config_dword(agp_bridge->dev, 172 EFFICEON_ATTPAGE, index); 173 } 174 printk(KERN_DEBUG PFX "efficeon_free_gatt_table() freed %d pages\n", freed); 175 return 0; 176 } 177 178 179 /* 180 * Since we don't need contiguous memory we just try 181 * to get the gatt table once 182 */ 183 184 #define GET_PAGE_DIR_OFF(addr) (addr >> 22) 185 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \ 186 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr)) 187 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12) 188 #undef GET_GATT 189 #define GET_GATT(addr) (efficeon_private.gatt_pages[\ 190 GET_PAGE_DIR_IDX(addr)]->remapped) 191 192 static int efficeon_create_gatt_table(struct agp_bridge_data *bridge) 193 { 194 int index; 195 const int pati = EFFICEON_PATI; 196 const int present = EFFICEON_PRESENT; 197 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3; 198 int num_entries, l1_pages; 199 200 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries; 201 202 printk(KERN_DEBUG PFX "efficeon_create_gatt_table(%d)\n", num_entries); 203 204 /* There are 2^10 PTE pages per PDE page */ 205 BUG_ON(num_entries & 0x3ff); 206 l1_pages = num_entries >> 10; 207 208 for (index = 0 ; index < l1_pages ; index++) { 209 int offset; 210 unsigned long page; 211 unsigned long value; 212 213 page = efficeon_private.l1_table[index]; 214 BUG_ON(page); 215 216 page = get_zeroed_page(GFP_KERNEL); 217 if (!page) { 218 efficeon_free_gatt_table(agp_bridge); 219 return -ENOMEM; 220 } 221 222 for (offset = 0; offset < PAGE_SIZE; offset += clflush_chunk) 223 clflush((char *)page+offset); 224 225 efficeon_private.l1_table[index] = page; 226 227 value = virt_to_phys((unsigned long *)page) | pati | present | index; 228 229 pci_write_config_dword(agp_bridge->dev, 230 EFFICEON_ATTPAGE, value); 231 } 232 233 return 0; 234 } 235 236 static int efficeon_insert_memory(struct agp_memory * mem, off_t pg_start, int type) 237 { 238 int i, count = mem->page_count, num_entries; 239 unsigned int *page, *last_page; 240 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3; 241 const unsigned long clflush_mask = ~(clflush_chunk-1); 242 243 printk(KERN_DEBUG PFX "efficeon_insert_memory(%lx, %d)\n", pg_start, count); 244 245 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries; 246 if ((pg_start + mem->page_count) > num_entries) 247 return -EINVAL; 248 if (type != 0 || mem->type != 0) 249 return -EINVAL; 250 251 if (!mem->is_flushed) { 252 global_cache_flush(); 253 mem->is_flushed = true; 254 } 255 256 last_page = NULL; 257 for (i = 0; i < count; i++) { 258 int index = pg_start + i; 259 unsigned long insert = efficeon_mask_memory(mem->pages[i]); 260 261 page = (unsigned int *) efficeon_private.l1_table[index >> 10]; 262 263 if (!page) 264 continue; 265 266 page += (index & 0x3ff); 267 *page = insert; 268 269 /* clflush is slow, so don't clflush until we have to */ 270 if (last_page && 271 (((unsigned long)page^(unsigned long)last_page) & 272 clflush_mask)) 273 clflush(last_page); 274 275 last_page = page; 276 } 277 278 if ( last_page ) 279 clflush(last_page); 280 281 agp_bridge->driver->tlb_flush(mem); 282 return 0; 283 } 284 285 static int efficeon_remove_memory(struct agp_memory * mem, off_t pg_start, int type) 286 { 287 int i, count = mem->page_count, num_entries; 288 289 printk(KERN_DEBUG PFX "efficeon_remove_memory(%lx, %d)\n", pg_start, count); 290 291 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries; 292 293 if ((pg_start + mem->page_count) > num_entries) 294 return -EINVAL; 295 if (type != 0 || mem->type != 0) 296 return -EINVAL; 297 298 for (i = 0; i < count; i++) { 299 int index = pg_start + i; 300 unsigned int *page = (unsigned int *) efficeon_private.l1_table[index >> 10]; 301 302 if (!page) 303 continue; 304 page += (index & 0x3ff); 305 *page = 0; 306 } 307 agp_bridge->driver->tlb_flush(mem); 308 return 0; 309 } 310 311 312 static const struct agp_bridge_driver efficeon_driver = { 313 .owner = THIS_MODULE, 314 .aperture_sizes = efficeon_generic_sizes, 315 .size_type = LVL2_APER_SIZE, 316 .num_aperture_sizes = 4, 317 .configure = efficeon_configure, 318 .fetch_size = efficeon_fetch_size, 319 .cleanup = efficeon_cleanup, 320 .tlb_flush = efficeon_tlbflush, 321 .mask_memory = agp_generic_mask_memory, 322 .masks = efficeon_generic_masks, 323 .agp_enable = agp_generic_enable, 324 .cache_flush = global_cache_flush, 325 326 // Efficeon-specific GATT table setup / populate / teardown 327 .create_gatt_table = efficeon_create_gatt_table, 328 .free_gatt_table = efficeon_free_gatt_table, 329 .insert_memory = efficeon_insert_memory, 330 .remove_memory = efficeon_remove_memory, 331 .cant_use_aperture = false, // true might be faster? 332 333 // Generic 334 .alloc_by_type = agp_generic_alloc_by_type, 335 .free_by_type = agp_generic_free_by_type, 336 .agp_alloc_page = agp_generic_alloc_page, 337 .agp_alloc_pages = agp_generic_alloc_pages, 338 .agp_destroy_page = agp_generic_destroy_page, 339 .agp_destroy_pages = agp_generic_destroy_pages, 340 .agp_type_to_mask_type = agp_generic_type_to_mask_type, 341 }; 342 343 static int agp_efficeon_probe(struct pci_dev *pdev, 344 const struct pci_device_id *ent) 345 { 346 struct agp_bridge_data *bridge; 347 u8 cap_ptr; 348 struct resource *r; 349 350 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP); 351 if (!cap_ptr) 352 return -ENODEV; 353 354 /* Probe for Efficeon controller */ 355 if (pdev->device != PCI_DEVICE_ID_EFFICEON) { 356 printk(KERN_ERR PFX "Unsupported Efficeon chipset (device id: %04x)\n", 357 pdev->device); 358 return -ENODEV; 359 } 360 361 printk(KERN_INFO PFX "Detected Transmeta Efficeon TM8000 series chipset\n"); 362 363 bridge = agp_alloc_bridge(); 364 if (!bridge) 365 return -ENOMEM; 366 367 bridge->driver = &efficeon_driver; 368 bridge->dev = pdev; 369 bridge->capndx = cap_ptr; 370 371 /* 372 * If the device has not been properly setup, the following will catch 373 * the problem and should stop the system from crashing. 374 * 20030610 - hamish@zot.org 375 */ 376 if (pci_enable_device(pdev)) { 377 printk(KERN_ERR PFX "Unable to Enable PCI device\n"); 378 agp_put_bridge(bridge); 379 return -ENODEV; 380 } 381 382 /* 383 * The following fixes the case where the BIOS has "forgotten" to 384 * provide an address range for the GART. 385 * 20030610 - hamish@zot.org 386 */ 387 r = &pdev->resource[0]; 388 if (!r->start && r->end) { 389 if (pci_assign_resource(pdev, 0)) { 390 printk(KERN_ERR PFX "could not assign resource 0\n"); 391 agp_put_bridge(bridge); 392 return -ENODEV; 393 } 394 } 395 396 /* Fill in the mode register */ 397 if (cap_ptr) { 398 pci_read_config_dword(pdev, 399 bridge->capndx+PCI_AGP_STATUS, 400 &bridge->mode); 401 } 402 403 pci_set_drvdata(pdev, bridge); 404 return agp_add_bridge(bridge); 405 } 406 407 static void agp_efficeon_remove(struct pci_dev *pdev) 408 { 409 struct agp_bridge_data *bridge = pci_get_drvdata(pdev); 410 411 agp_remove_bridge(bridge); 412 agp_put_bridge(bridge); 413 } 414 415 static int agp_efficeon_resume(struct device *dev) 416 { 417 printk(KERN_DEBUG PFX "agp_efficeon_resume()\n"); 418 return efficeon_configure(); 419 } 420 421 static const struct pci_device_id agp_efficeon_pci_table[] = { 422 { 423 .class = (PCI_CLASS_BRIDGE_HOST << 8), 424 .class_mask = ~0, 425 .vendor = PCI_VENDOR_ID_TRANSMETA, 426 .device = PCI_ANY_ID, 427 .subvendor = PCI_ANY_ID, 428 .subdevice = PCI_ANY_ID, 429 }, 430 { } 431 }; 432 433 static DEFINE_SIMPLE_DEV_PM_OPS(agp_efficeon_pm_ops, NULL, agp_efficeon_resume); 434 435 MODULE_DEVICE_TABLE(pci, agp_efficeon_pci_table); 436 437 static struct pci_driver agp_efficeon_pci_driver = { 438 .name = "agpgart-efficeon", 439 .id_table = agp_efficeon_pci_table, 440 .probe = agp_efficeon_probe, 441 .remove = agp_efficeon_remove, 442 .driver.pm = &agp_efficeon_pm_ops, 443 }; 444 445 static int __init agp_efficeon_init(void) 446 { 447 static int agp_initialised=0; 448 449 if (agp_off) 450 return -EINVAL; 451 452 if (agp_initialised == 1) 453 return 0; 454 agp_initialised=1; 455 456 return pci_register_driver(&agp_efficeon_pci_driver); 457 } 458 459 static void __exit agp_efficeon_cleanup(void) 460 { 461 pci_unregister_driver(&agp_efficeon_pci_driver); 462 } 463 464 module_init(agp_efficeon_init); 465 module_exit(agp_efficeon_cleanup); 466 467 MODULE_AUTHOR("Carlos Puchol <cpglinux@puchol.com>"); 468 MODULE_DESCRIPTION("Transmeta's Efficeon AGPGART driver"); 469 MODULE_LICENSE("GPL and additional rights"); 470