drivers/char/agp/ati-agp.c

   1 /*
   2  * ATi AGPGART routines.
   3  */
   4
   5 #include <linux/types.h>
   6 #include <linux/module.h>
   7 #include <linux/pci.h>
   8 #include <linux/init.h>
   9 #include <linux/string.h>
  10 #include <linux/slab.h>
  11 #include <linux/agp_backend.h>
  12 #include <asm/agp.h>
  13 #include "agp.h"
  14
  15 #define ATI_GART_MMBASE_ADDR    0x14
  16 #define ATI_RS100_APSIZE        0xac
  17 #define ATI_RS100_IG_AGPMODE    0xb0
  18 #define ATI_RS300_APSIZE        0xf8
  19 #define ATI_RS300_IG_AGPMODE    0xfc
  20 #define ATI_GART_FEATURE_ID             0x00
  21 #define ATI_GART_BASE                   0x04
  22 #define ATI_GART_CACHE_SZBASE           0x08
  23 #define ATI_GART_CACHE_CNTRL            0x0c
  24 #define ATI_GART_CACHE_ENTRY_CNTRL      0x10
  25
  26
  27 static struct aper_size_info_lvl2 ati_generic_sizes[7] =
  28 {
  29         {2048, 524288, 0x0000000c},
  30         {1024, 262144, 0x0000000a},
  31         {512, 131072, 0x00000008},
  32         {256, 65536, 0x00000006},
  33         {128, 32768, 0x00000004},
  34         {64, 16384, 0x00000002},
  35         {32, 8192, 0x00000000}
  36 };
  37
  38 static struct gatt_mask ati_generic_masks[] =
  39 {
  40         { .mask = 1, .type = 0}
  41 };
  42
  43
  44
  45 typedef struct _ati_page_map {
  46         unsigned long *real;
  47         unsigned long __iomem *remapped;
  48 } ati_page_map;
  49
  50 static struct _ati_generic_private {
  51         volatile u8 __iomem *registers;
  52         ati_page_map **gatt_pages;
  53         int num_tables;
  54 } ati_generic_private;
  55
  56 static int ati_create_page_map(ati_page_map *page_map)
  57 {
  58         int i, err = 0;
  59
  60         page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
  61         if (page_map->real == NULL)
  62                 return -ENOMEM;
  63
  64         SetPageReserved(virt_to_page(page_map->real));
  65         err = map_page_into_agp(virt_to_page(page_map->real));
  66         page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),
  67                                             PAGE_SIZE);
  68         if (page_map->remapped == NULL || err) {
  69                 ClearPageReserved(virt_to_page(page_map->real));
  70                 free_page((unsigned long) page_map->real);
  71                 page_map->real = NULL;
  72                 return -ENOMEM;
  73         }
  74         /*CACHE_FLUSH();*/
  75         global_cache_flush();
  76
  77         for(i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
  78                 writel(agp_bridge->scratch_page, page_map->remapped+i);
  79                 readl(page_map->remapped+i);    /* PCI Posting. */
  80         }
  81
  82         return 0;
  83 }
  84
  85
  86 static void ati_free_page_map(ati_page_map *page_map)
  87 {
  88         unmap_page_from_agp(virt_to_page(page_map->real));
  89         iounmap(page_map->remapped);
  90         ClearPageReserved(virt_to_page(page_map->real));
  91         free_page((unsigned long) page_map->real);
  92 }
  93
  94
  95 static void ati_free_gatt_pages(void)
  96 {
  97         int i;
  98         ati_page_map **tables;
  99         ati_page_map *entry;
 100
 101         tables = ati_generic_private.gatt_pages;
 102         for(i = 0; i < ati_generic_private.num_tables; i++) {
 103                 entry = tables[i];
 104                 if (entry != NULL) {
 105                         if (entry->real != NULL)
 106                                 ati_free_page_map(entry);
 107                         kfree(entry);
 108                 }
 109         }
 110         kfree(tables);
 111 }
 112
 113
 114 static int ati_create_gatt_pages(int nr_tables)
 115 {
 116         ati_page_map **tables;
 117         ati_page_map *entry;
 118         int retval = 0;
 119         int i;
 120
 121         tables = kzalloc((nr_tables + 1) * sizeof(ati_page_map *),GFP_KERNEL);
 122         if (tables == NULL)
 123                 return -ENOMEM;
 124
 125         for (i = 0; i < nr_tables; i++) {
 126                 entry = kzalloc(sizeof(ati_page_map), GFP_KERNEL);
 127                 if (entry == NULL) {
 128                         while (i>0) {
 129                                 kfree (tables[i-1]);
 130                                 i--;
 131                         }
 132                         kfree (tables);
 133                         tables = NULL;
 134                         retval = -ENOMEM;
 135                         break;
 136                 }
 137                 tables[i] = entry;
 138                 retval = ati_create_page_map(entry);
 139                 if (retval != 0) break;
 140         }
 141         ati_generic_private.num_tables = nr_tables;
 142         ati_generic_private.gatt_pages = tables;
 143
 144         if (retval != 0) ati_free_gatt_pages();
 145
 146         return retval;
 147 }
 148
 149 static int is_r200(void)
 150 {
 151         if ((agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS100) ||
 152             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200) ||
 153             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS200_B) ||
 154             (agp_bridge->dev->device == PCI_DEVICE_ID_ATI_RS250))
 155                 return 1;
 156         return 0;
 157 }
 158
 159 static int ati_fetch_size(void)
 160 {
 161         int i;
 162         u32 temp;
 163         struct aper_size_info_lvl2 *values;
 164
 165         if (is_r200())
 166                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
 167         else
 168                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
 169
 170         temp = (temp & 0x0000000e);
 171         values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
 172         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
 173                 if (temp == values[i].size_value) {
 174                         agp_bridge->previous_size =
 175                             agp_bridge->current_size = (void *) (values + i);
 176
 177                         agp_bridge->aperture_size_idx = i;
 178                         return values[i].size;
 179                 }
 180         }
 181
 182         return 0;
 183 }
 184
 185 static void ati_tlbflush(struct agp_memory * mem)
 186 {
 187         writel(1, ati_generic_private.registers+ATI_GART_CACHE_CNTRL);
 188         readl(ati_generic_private.registers+ATI_GART_CACHE_CNTRL);      /* PCI Posting. */
 189 }
 190
 191 static void ati_cleanup(void)
 192 {
 193         struct aper_size_info_lvl2 *previous_size;
 194         u32 temp;
 195
 196         previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
 197
 198         /* Write back the previous size and disable gart translation */
 199         if (is_r200()) {
 200                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
 201                 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 202                 pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
 203         } else {
 204                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
 205                 temp = ((temp & ~(0x0000000f)) | previous_size->size_value);
 206                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
 207         }
 208         iounmap((volatile u8 __iomem *)ati_generic_private.registers);
 209 }
 210
 211
 212 static int ati_configure(void)
 213 {
 214         u32 temp;
 215
 216         /* Get the memory mapped registers */
 217         pci_read_config_dword(agp_bridge->dev, ATI_GART_MMBASE_ADDR, &temp);
 218         temp = (temp & 0xfffff000);
 219         ati_generic_private.registers = (volatile u8 __iomem *) ioremap(temp, 4096);
 220
 221         if (is_r200())
 222         pci_write_config_dword(agp_bridge->dev, ATI_RS100_IG_AGPMODE, 0x20000);
 223         else
 224                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_IG_AGPMODE, 0x20000);
 225
 226         /* address to map too */
 227         /*
 228         pci_read_config_dword(agp_bridge.dev, AGP_APBASE, &temp);
 229         agp_bridge.gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 230         printk(KERN_INFO PFX "IGP320 gart_bus_addr: %x\n", agp_bridge.gart_bus_addr);
 231         */
 232         writel(0x60000, ati_generic_private.registers+ATI_GART_FEATURE_ID);
 233         readl(ati_generic_private.registers+ATI_GART_FEATURE_ID);       /* PCI Posting.*/
 234
 235         /* SIGNALED_SYSTEM_ERROR @ NB_STATUS */
 236         pci_read_config_dword(agp_bridge->dev, 4, &temp);
 237         pci_write_config_dword(agp_bridge->dev, 4, temp | (1<<14));
 238
 239         /* Write out the address of the gatt table */
 240         writel(agp_bridge->gatt_bus_addr, ati_generic_private.registers+ATI_GART_BASE);
 241         readl(ati_generic_private.registers+ATI_GART_BASE);     /* PCI Posting. */
 242
 243         return 0;
 244 }
 245
 246
 247 /*
 248  *Since we don't need contigious memory we just try
 249  * to get the gatt table once
 250  */
 251
 252 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
 253 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
 254         GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
 255 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
 256 #undef  GET_GATT
 257 #define GET_GATT(addr) (ati_generic_private.gatt_pages[\
 258         GET_PAGE_DIR_IDX(addr)]->remapped)
 259
 260 static int ati_insert_memory(struct agp_memory * mem,
 261                              off_t pg_start, int type)
 262 {
 263         int i, j, num_entries;
 264         unsigned long __iomem *cur_gatt;
 265         unsigned long addr;
 266
 267         num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
 268
 269         if (type != 0 || mem->type != 0)
 270                 return -EINVAL;
 271
 272         if ((pg_start + mem->page_count) > num_entries)
 273                 return -EINVAL;
 274
 275         j = pg_start;
 276         while (j < (pg_start + mem->page_count)) {
 277                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 278                 cur_gatt = GET_GATT(addr);
 279                 if (!PGE_EMPTY(agp_bridge,readl(cur_gatt+GET_GATT_OFF(addr))))
 280                         return -EBUSY;
 281                 j++;
 282         }
 283
 284         if (mem->is_flushed == FALSE) {
 285                 /*CACHE_FLUSH(); */
 286                 global_cache_flush();
 287                 mem->is_flushed = TRUE;
 288         }
 289
 290         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 291                 addr = (j * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 292                 cur_gatt = GET_GATT(addr);
 293                 writel(agp_bridge->driver->mask_memory(agp_bridge,
 294                         mem->memory[i], mem->type), cur_gatt+GET_GATT_OFF(addr));
 295                 readl(cur_gatt+GET_GATT_OFF(addr));     /* PCI Posting. */
 296         }
 297         agp_bridge->driver->tlb_flush(mem);
 298         return 0;
 299 }
 300
 301 static int ati_remove_memory(struct agp_memory * mem, off_t pg_start,
 302                              int type)
 303 {
 304         int i;
 305         unsigned long __iomem *cur_gatt;
 306         unsigned long addr;
 307
 308         if (type != 0 || mem->type != 0) {
 309                 return -EINVAL;
 310         }
 311         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 312                 addr = (i * PAGE_SIZE) + agp_bridge->gart_bus_addr;
 313                 cur_gatt = GET_GATT(addr);
 314                 writel(agp_bridge->scratch_page, cur_gatt+GET_GATT_OFF(addr));
 315                 readl(cur_gatt+GET_GATT_OFF(addr)); /* PCI Posting. */
 316         }
 317
 318         agp_bridge->driver->tlb_flush(mem);
 319         return 0;
 320 }
 321
 322 static int ati_create_gatt_table(struct agp_bridge_data *bridge)
 323 {
 324         struct aper_size_info_lvl2 *value;
 325         ati_page_map page_dir;
 326         unsigned long addr;
 327         int retval;
 328         u32 temp;
 329         int i;
 330         struct aper_size_info_lvl2 *current_size;
 331
 332         value = A_SIZE_LVL2(agp_bridge->current_size);
 333         retval = ati_create_page_map(&page_dir);
 334         if (retval != 0)
 335                 return retval;
 336
 337         retval = ati_create_gatt_pages(value->num_entries / 1024);
 338         if (retval != 0) {
 339                 ati_free_page_map(&page_dir);
 340                 return retval;
 341         }
 342
 343         agp_bridge->gatt_table_real = (u32 *)page_dir.real;
 344         agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
 345         agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
 346
 347         /* Write out the size register */
 348         current_size = A_SIZE_LVL2(agp_bridge->current_size);
 349
 350         if (is_r200()) {
 351                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
 352                 temp = (((temp & ~(0x0000000e)) | current_size->size_value)
 353                         | 0x00000001);
 354                 pci_write_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, temp);
 355                 pci_read_config_dword(agp_bridge->dev, ATI_RS100_APSIZE, &temp);
 356         } else {
 357                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
 358                 temp = (((temp & ~(0x0000000e)) | current_size->size_value)
 359                         | 0x00000001);
 360                 pci_write_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, temp);
 361                 pci_read_config_dword(agp_bridge->dev, ATI_RS300_APSIZE, &temp);
 362         }
 363
 364         /*
 365          * Get the address for the gart region.
 366          * This is a bus address even on the alpha, b/c its
 367          * used to program the agp master not the cpu
 368          */
 369         pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
 370         addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
 371         agp_bridge->gart_bus_addr = addr;
 372
 373         /* Calculate the agp offset */
 374         for(i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
 375                 writel(virt_to_gart(ati_generic_private.gatt_pages[i]->real) | 1,
 376                         page_dir.remapped+GET_PAGE_DIR_OFF(addr));
 377                 readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr));        /* PCI Posting. */
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int ati_free_gatt_table(struct agp_bridge_data *bridge)
 384 {
 385         ati_page_map page_dir;
 386
 387         page_dir.real = (unsigned long *)agp_bridge->gatt_table_real;
 388         page_dir.remapped = (unsigned long __iomem *)agp_bridge->gatt_table;
 389
 390         ati_free_gatt_pages();
 391         ati_free_page_map(&page_dir);
 392         return 0;
 393 }
 394
 395 static struct agp_bridge_driver ati_generic_bridge = {
 396         .owner                  = THIS_MODULE,
 397         .aperture_sizes         = ati_generic_sizes,
 398         .size_type              = LVL2_APER_SIZE,
 399         .num_aperture_sizes     = 7,
 400         .configure              = ati_configure,
 401         .fetch_size             = ati_fetch_size,
 402         .cleanup                = ati_cleanup,
 403         .tlb_flush              = ati_tlbflush,
 404         .mask_memory            = agp_generic_mask_memory,
 405         .masks                  = ati_generic_masks,
 406         .agp_enable             = agp_generic_enable,
 407         .cache_flush            = global_cache_flush,
 408         .create_gatt_table      = ati_create_gatt_table,
 409         .free_gatt_table        = ati_free_gatt_table,
 410         .insert_memory          = ati_insert_memory,
 411         .remove_memory          = ati_remove_memory,
 412         .alloc_by_type          = agp_generic_alloc_by_type,
 413         .free_by_type           = agp_generic_free_by_type,
 414         .agp_alloc_page         = agp_generic_alloc_page,
 415         .agp_destroy_page       = agp_generic_destroy_page,
 416 };
 417
 418
 419 static struct agp_device_ids ati_agp_device_ids[] __devinitdata =
 420 {
 421         {
 422                 .device_id      = PCI_DEVICE_ID_ATI_RS100,
 423                 .chipset_name   = "IGP320/M",
 424         },
 425         {
 426                 .device_id      = PCI_DEVICE_ID_ATI_RS200,
 427                 .chipset_name   = "IGP330/340/345/350/M",
 428         },
 429         {
 430                 .device_id      = PCI_DEVICE_ID_ATI_RS200_B,
 431                 .chipset_name   = "IGP345M",
 432         },
 433         {
 434                 .device_id      = PCI_DEVICE_ID_ATI_RS250,
 435                 .chipset_name   = "IGP7000/M",
 436         },
 437         {
 438                 .device_id      = PCI_DEVICE_ID_ATI_RS300_100,
 439                 .chipset_name   = "IGP9100/M",
 440         },
 441         {
 442                 .device_id      = PCI_DEVICE_ID_ATI_RS300_133,
 443                 .chipset_name   = "IGP9100/M",
 444         },
 445         {
 446                 .device_id      = PCI_DEVICE_ID_ATI_RS300_166,
 447                 .chipset_name   = "IGP9100/M",
 448         },
 449         {
 450                 .device_id      = PCI_DEVICE_ID_ATI_RS300_200,
 451                 .chipset_name   = "IGP9100/M",
 452         },
 453         { }, /* dummy final entry, always present */
 454 };
 455
 456 static int __devinit agp_ati_probe(struct pci_dev *pdev,
 457                                    const struct pci_device_id *ent)
 458 {
 459         struct agp_device_ids *devs = ati_agp_device_ids;
 460         struct agp_bridge_data *bridge;
 461         u8 cap_ptr;
 462         int j;
 463
 464         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 465         if (!cap_ptr)
 466                 return -ENODEV;
 467
 468         /* probe for known chipsets */
 469         for (j = 0; devs[j].chipset_name; j++) {
 470                 if (pdev->device == devs[j].device_id)
 471                         goto found;
 472         }
 473
 474         printk(KERN_ERR PFX
 475              "Unsupported Ati chipset (device id: %04x)\n", pdev->device);
 476         return -ENODEV;
 477
 478 found:
 479         bridge = agp_alloc_bridge();
 480         if (!bridge)
 481                 return -ENOMEM;
 482
 483         bridge->dev = pdev;
 484         bridge->capndx = cap_ptr;
 485
 486         bridge->driver = &ati_generic_bridge;
 487
 488
 489         printk(KERN_INFO PFX "Detected Ati %s chipset\n",
 490                         devs[j].chipset_name);
 491
 492         /* Fill in the mode register */
 493         pci_read_config_dword(pdev,
 494                         bridge->capndx+PCI_AGP_STATUS,
 495                         &bridge->mode);
 496
 497         pci_set_drvdata(pdev, bridge);
 498         return agp_add_bridge(bridge);
 499 }
 500
 501 static void __devexit agp_ati_remove(struct pci_dev *pdev)
 502 {
 503         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 504
 505         agp_remove_bridge(bridge);
 506         agp_put_bridge(bridge);
 507 }
 508
 509 static struct pci_device_id agp_ati_pci_table[] = {
 510         {
 511         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 512         .class_mask     = ~0,
 513         .vendor         = PCI_VENDOR_ID_ATI,
 514         .device         = PCI_ANY_ID,
 515         .subvendor      = PCI_ANY_ID,
 516         .subdevice      = PCI_ANY_ID,
 517         },
 518         { }
 519 };
 520
 521 MODULE_DEVICE_TABLE(pci, agp_ati_pci_table);
 522
 523 static struct pci_driver agp_ati_pci_driver = {
 524         .name           = "agpgart-ati",
 525         .id_table       = agp_ati_pci_table,
 526         .probe          = agp_ati_probe,
 527         .remove         = agp_ati_remove,
 528 };
 529
 530 static int __init agp_ati_init(void)
 531 {
 532         if (agp_off)
 533                 return -EINVAL;
 534         return pci_register_driver(&agp_ati_pci_driver);
 535 }
 536
 537 static void __exit agp_ati_cleanup(void)
 538 {
 539         pci_unregister_driver(&agp_ati_pci_driver);
 540 }
 541
 542 module_init(agp_ati_init);
 543 module_exit(agp_ati_cleanup);
 544
 545 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
 546 MODULE_LICENSE("GPL and additional rights");
 547