drivers/char/agp/uninorth-agp.c

   1 /*
   2  * UniNorth AGPGART routines.
   3  */
   4 #include <linux/module.h>
   5 #include <linux/pci.h>
   6 #include <linux/init.h>
   7 #include <linux/pagemap.h>
   8 #include <linux/agp_backend.h>
   9 #include <asm/uninorth.h>
  10 #include <asm/pci-bridge.h>
  11 #include "agp.h"
  12
  13 static int uninorth_fetch_size(void)
  14 {
  15         int i;
  16         u32 temp;
  17         struct aper_size_info_32 *values;
  18
  19         pci_read_config_dword(agp_bridge->dev, UNI_N_CFG_GART_BASE, &temp);
  20         temp &= ~(0xfffff000);
  21         values = A_SIZE_32(agp_bridge->driver->aperture_sizes);
  22
  23         for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
  24                 if (temp == values[i].size_value) {
  25                         agp_bridge->previous_size =
  26                             agp_bridge->current_size = (void *) (values + i);
  27                         agp_bridge->aperture_size_idx = i;
  28                         return values[i].size;
  29                 }
  30         }
  31
  32         agp_bridge->previous_size =
  33             agp_bridge->current_size = (void *) (values + 1);
  34         agp_bridge->aperture_size_idx = 1;
  35         return values[1].size;
  36
  37         return 0;
  38 }
  39
  40 static void uninorth_tlbflush(struct agp_memory *mem)
  41 {
  42         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  43                         UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_INVAL);
  44         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  45                         UNI_N_CFG_GART_ENABLE);
  46         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  47                         UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_2xRESET);
  48         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  49                         UNI_N_CFG_GART_ENABLE);
  50 }
  51
  52 static void uninorth_cleanup(void)
  53 {
  54         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  55                         UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_INVAL);
  56         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  57                         0);
  58         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  59                         UNI_N_CFG_GART_2xRESET);
  60         pci_write_config_dword(agp_bridge->dev, UNI_N_CFG_GART_CTRL,
  61                         0);
  62 }
  63
  64 static int uninorth_configure(void)
  65 {
  66         struct aper_size_info_32 *current_size;
  67
  68         current_size = A_SIZE_32(agp_bridge->current_size);
  69
  70         printk(KERN_INFO PFX "configuring for size idx: %d\n",
  71                current_size->size_value);
  72
  73         /* aperture size and gatt addr */
  74         pci_write_config_dword(agp_bridge->dev,
  75                 UNI_N_CFG_GART_BASE,
  76                 (agp_bridge->gatt_bus_addr & 0xfffff000)
  77                         | current_size->size_value);
  78
  79         /* HACK ALERT
  80          * UniNorth seem to be buggy enough not to handle properly when
  81          * the AGP aperture isn't mapped at bus physical address 0
  82          */
  83         agp_bridge->gart_bus_addr = 0;
  84         pci_write_config_dword(agp_bridge->dev,
  85                 UNI_N_CFG_AGP_BASE, agp_bridge->gart_bus_addr);
  86
  87         return 0;
  88 }
  89
  90 static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start,
  91                                 int type)
  92 {
  93         int i, j, num_entries;
  94         void *temp;
  95
  96         temp = agp_bridge->current_size;
  97         num_entries = A_SIZE_32(temp)->num_entries;
  98
  99         if (type != 0 || mem->type != 0)
 100                 /* We know nothing of memory types */
 101                 return -EINVAL;
 102         if ((pg_start + mem->page_count) > num_entries)
 103                 return -EINVAL;
 104
 105         j = pg_start;
 106
 107         while (j < (pg_start + mem->page_count)) {
 108                 if (!PGE_EMPTY(agp_bridge, agp_bridge->gatt_table[j]))
 109                         return -EBUSY;
 110                 j++;
 111         }
 112
 113         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 114                 agp_bridge->gatt_table[j] = cpu_to_le32((mem->memory[i] & 0xfffff000) | 0x00000001UL);
 115                 flush_dcache_range((unsigned long)__va(mem->memory[i]),
 116                                    (unsigned long)__va(mem->memory[i])+0x1000);
 117         }
 118         (void)in_le32((volatile u32*)&agp_bridge->gatt_table[pg_start]);
 119         mb();
 120         flush_dcache_range((unsigned long)&agp_bridge->gatt_table[pg_start],
 121                 (unsigned long)&agp_bridge->gatt_table[pg_start + mem->page_count]);
 122
 123         uninorth_tlbflush(mem);
 124         return 0;
 125 }
 126
 127 static void uninorth_agp_enable(u32 mode)
 128 {
 129         u32 command, scratch;
 130         int timeout;
 131
 132         pci_read_config_dword(agp_bridge->dev,
 133                               agp_bridge->capndx + PCI_AGP_STATUS,
 134                               &command);
 135
 136         command = agp_collect_device_status(mode, command);
 137         command |= 0x100;
 138
 139         uninorth_tlbflush(NULL);
 140
 141         timeout = 0;
 142         do {
 143                 pci_write_config_dword(agp_bridge->dev,
 144                                        agp_bridge->capndx + PCI_AGP_COMMAND,
 145                                        command);
 146                 pci_read_config_dword(agp_bridge->dev,
 147                                        agp_bridge->capndx + PCI_AGP_COMMAND,
 148                                        &scratch);
 149         } while ((scratch & 0x100) == 0 && ++timeout < 1000);
 150         if ((scratch & 0x100) == 0)
 151                 printk(KERN_ERR PFX "failed to write UniNorth AGP command reg\n");
 152
 153         agp_device_command(command, 0);
 154
 155         uninorth_tlbflush(NULL);
 156 }
 157
 158 static int uninorth_create_gatt_table(void)
 159 {
 160         char *table;
 161         char *table_end;
 162         int size;
 163         int page_order;
 164         int num_entries;
 165         int i;
 166         void *temp;
 167         struct page *page;
 168
 169         /* We can't handle 2 level gatt's */
 170         if (agp_bridge->driver->size_type == LVL2_APER_SIZE)
 171                 return -EINVAL;
 172
 173         table = NULL;
 174         i = agp_bridge->aperture_size_idx;
 175         temp = agp_bridge->current_size;
 176         size = page_order = num_entries = 0;
 177
 178         do {
 179                 size = A_SIZE_32(temp)->size;
 180                 page_order = A_SIZE_32(temp)->page_order;
 181                 num_entries = A_SIZE_32(temp)->num_entries;
 182
 183                 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
 184
 185                 if (table == NULL) {
 186                         i++;
 187                         agp_bridge->current_size = A_IDX32(agp_bridge);
 188                 } else {
 189                         agp_bridge->aperture_size_idx = i;
 190                 }
 191         } while (!table && (i < agp_bridge->driver->num_aperture_sizes));
 192
 193         if (table == NULL)
 194                 return -ENOMEM;
 195
 196         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 197
 198         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 199                 SetPageReserved(page);
 200
 201         agp_bridge->gatt_table_real = (u32 *) table;
 202         agp_bridge->gatt_table = (u32 *)table;
 203         agp_bridge->gatt_bus_addr = virt_to_phys(table);
 204
 205         for (i = 0; i < num_entries; i++) {
 206                 agp_bridge->gatt_table[i] =
 207                     (unsigned long) agp_bridge->scratch_page;
 208         }
 209
 210         flush_dcache_range((unsigned long)table, (unsigned long)table_end);
 211
 212         return 0;
 213 }
 214
 215 static int uninorth_free_gatt_table(void)
 216 {
 217         int page_order;
 218         char *table, *table_end;
 219         void *temp;
 220         struct page *page;
 221
 222         temp = agp_bridge->current_size;
 223         page_order = A_SIZE_32(temp)->page_order;
 224
 225         /* Do not worry about freeing memory, because if this is
 226          * called, then all agp memory is deallocated and removed
 227          * from the table.
 228          */
 229
 230         table = (char *) agp_bridge->gatt_table_real;
 231         table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
 232
 233         for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
 234                 ClearPageReserved(page);
 235
 236         free_pages((unsigned long) agp_bridge->gatt_table_real, page_order);
 237
 238         return 0;
 239 }
 240
 241 void null_cache_flush(void)
 242 {
 243         mb();
 244 }
 245
 246 /* Setup function */
 247
 248 static struct aper_size_info_32 uninorth_sizes[7] =
 249 {
 250 #if 0 /* Not sure uninorth supports that high aperture sizes */
 251         {256, 65536, 6, 64},
 252         {128, 32768, 5, 32},
 253         {64, 16384, 4, 16},
 254 #endif
 255         {32, 8192, 3, 8},
 256         {16, 4096, 2, 4},
 257         {8, 2048, 1, 2},
 258         {4, 1024, 0, 1}
 259 };
 260
 261 struct agp_bridge_driver uninorth_agp_driver = {
 262         .owner                  = THIS_MODULE,
 263         .aperture_sizes         = (void *)uninorth_sizes,
 264         .size_type              = U32_APER_SIZE,
 265         .num_aperture_sizes     = 4,
 266         .configure              = uninorth_configure,
 267         .fetch_size             = uninorth_fetch_size,
 268         .cleanup                = uninorth_cleanup,
 269         .tlb_flush              = uninorth_tlbflush,
 270         .mask_memory            = agp_generic_mask_memory,
 271         .masks                  = NULL,
 272         .cache_flush            = null_cache_flush,
 273         .agp_enable             = uninorth_agp_enable,
 274         .create_gatt_table      = uninorth_create_gatt_table,
 275         .free_gatt_table        = uninorth_free_gatt_table,
 276         .insert_memory          = uninorth_insert_memory,
 277         .remove_memory          = agp_generic_remove_memory,
 278         .alloc_by_type          = agp_generic_alloc_by_type,
 279         .free_by_type           = agp_generic_free_by_type,
 280         .agp_alloc_page         = agp_generic_alloc_page,
 281         .agp_destroy_page       = agp_generic_destroy_page,
 282         .cant_use_aperture      = 1,
 283 };
 284
 285 static struct agp_device_ids uninorth_agp_device_ids[] __devinitdata = {
 286         {
 287                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP,
 288                 .chipset_name   = "UniNorth",
 289         },
 290         {
 291                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
 292                 .chipset_name   = "UniNorth/Pangea",
 293         },
 294         {
 295                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
 296                 .chipset_name   = "UniNorth 1.5",
 297         },
 298         {
 299                 .device_id      = PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
 300                 .chipset_name   = "UniNorth 2",
 301         },
 302 };
 303
 304 static int __devinit agp_uninorth_probe(struct pci_dev *pdev,
 305                                         const struct pci_device_id *ent)
 306 {
 307         struct agp_device_ids *devs = uninorth_agp_device_ids;
 308         struct agp_bridge_data *bridge;
 309         u8 cap_ptr;
 310         int j;
 311
 312         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 313         if (cap_ptr == 0)
 314                 return -ENODEV;
 315
 316         /* probe for known chipsets */
 317         for (j = 0; devs[j].chipset_name != NULL; ++j) {
 318                 if (pdev->device == devs[j].device_id) {
 319                         printk(KERN_INFO PFX "Detected Apple %s chipset\n",
 320                                devs[j].chipset_name);
 321                         goto found;
 322                 }
 323         }
 324
 325         printk(KERN_ERR PFX "Unsupported Apple chipset (device id: %04x).\n",
 326                 pdev->device);
 327         return -ENODEV;
 328
 329  found:
 330         bridge = agp_alloc_bridge();
 331         if (!bridge)
 332                 return -ENOMEM;
 333
 334         bridge->driver = &uninorth_agp_driver;
 335         bridge->dev = pdev;
 336         bridge->capndx = cap_ptr;
 337
 338         /* Fill in the mode register */
 339         pci_read_config_dword(pdev, cap_ptr+PCI_AGP_STATUS, &bridge->mode);
 340
 341         pci_set_drvdata(pdev, bridge);
 342         return agp_add_bridge(bridge);
 343 }
 344
 345 static void __devexit agp_uninorth_remove(struct pci_dev *pdev)
 346 {
 347         struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
 348
 349         agp_remove_bridge(bridge);
 350         agp_put_bridge(bridge);
 351 }
 352
 353 static struct pci_device_id agp_uninorth_pci_table[] = {
 354         {
 355         .class          = (PCI_CLASS_BRIDGE_HOST << 8),
 356         .class_mask     = ~0,
 357         .vendor         = PCI_VENDOR_ID_APPLE,
 358         .device         = PCI_ANY_ID,
 359         .subvendor      = PCI_ANY_ID,
 360         .subdevice      = PCI_ANY_ID,
 361         },
 362         { }
 363 };
 364
 365 MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);
 366
 367 static struct pci_driver agp_uninorth_pci_driver = {
 368         .name           = "agpgart-uninorth",
 369         .id_table       = agp_uninorth_pci_table,
 370         .probe          = agp_uninorth_probe,
 371         .remove         = agp_uninorth_remove,
 372 };
 373
 374 static int __init agp_uninorth_init(void)
 375 {
 376         return pci_module_init(&agp_uninorth_pci_driver);
 377 }
 378
 379 static void __exit agp_uninorth_cleanup(void)
 380 {
 381         pci_unregister_driver(&agp_uninorth_pci_driver);
 382 }
 383
 384 module_init(agp_uninorth_init);
 385 module_exit(agp_uninorth_cleanup);
 386
 387 MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
 388 MODULE_LICENSE("GPL");