drivers/char/agp/sgi-agp.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003-2005 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9 /*
  10  * SGI TIOCA AGPGART routines.
  11  *
  12  */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/agp_backend.h>
  20 #include <asm/sn/addrs.h>
  21 #include <asm/sn/io.h>
  22 #include <asm/sn/pcidev.h>
  23 #include <asm/sn/pcibus_provider_defs.h>
  24 #include <asm/sn/tioca_provider.h>
  25 #include "agp.h"
  26
  27 extern int agp_memory_reserved;
  28 extern uint32_t tioca_gart_found;
  29 extern struct list_head tioca_list;
  30 static struct agp_bridge_data **sgi_tioca_agp_bridges;
  31
  32 /*
  33  * The aperature size and related information is set up at TIOCA init time.
  34  * Values for this table will be extracted and filled in at
  35  * sgi_tioca_fetch_size() time.
  36  */
  37
  38 static struct aper_size_info_fixed sgi_tioca_sizes[] = {
  39         {0, 0, 0},
  40 };
  41
  42 static struct page *sgi_tioca_alloc_page(struct agp_bridge_data *bridge)
  43 {
  44         struct page *page;
  45         int nid;
  46         struct tioca_kernel *info =
  47             (struct tioca_kernel *)bridge->dev_private_data;
  48
  49         nid = info->ca_closest_node;
  50         page = alloc_pages_node(nid, GFP_KERNEL, 0);
  51         if (!page)
  52                 return NULL;
  53
  54         get_page(page);
  55         atomic_inc(&agp_bridge->current_memory_agp);
  56         return page;
  57 }
  58
  59 /*
  60  * Flush GART tlb's.  Cannot selectively flush based on memory so the mem
  61  * arg is ignored.
  62  */
  63
  64 static void sgi_tioca_tlbflush(struct agp_memory *mem)
  65 {
  66         tioca_tlbflush(mem->bridge->dev_private_data);
  67 }
  68
  69 /*
  70  * Given an address of a host physical page, turn it into a valid gart
  71  * entry.
  72  */
  73 static unsigned long
  74 sgi_tioca_mask_memory(struct agp_bridge_data *bridge, dma_addr_t addr,
  75                       int type)
  76 {
  77         return tioca_physpage_to_gart(addr);
  78 }
  79
  80 static void sgi_tioca_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  81 {
  82         tioca_fastwrite_enable(bridge->dev_private_data);
  83 }
  84
  85 /*
  86  * sgi_tioca_configure() doesn't have anything to do since the base CA driver
  87  * has alreay set up the GART.
  88  */
  89
  90 static int sgi_tioca_configure(void)
  91 {
  92         return 0;
  93 }
  94
  95 /*
  96  * Determine gfx aperature size.  This has already been determined by the
  97  * CA driver init, so just need to set agp_bridge values accordingly.
  98  */
  99
 100 static int sgi_tioca_fetch_size(void)
 101 {
 102         struct tioca_kernel *info =
 103             (struct tioca_kernel *)agp_bridge->dev_private_data;
 104
 105         sgi_tioca_sizes[0].size = info->ca_gfxap_size / MB(1);
 106         sgi_tioca_sizes[0].num_entries = info->ca_gfxgart_entries;
 107
 108         return sgi_tioca_sizes[0].size;
 109 }
 110
 111 static int sgi_tioca_create_gatt_table(struct agp_bridge_data *bridge)
 112 {
 113         struct tioca_kernel *info =
 114             (struct tioca_kernel *)bridge->dev_private_data;
 115
 116         bridge->gatt_table_real = (u32 *) info->ca_gfxgart;
 117         bridge->gatt_table = bridge->gatt_table_real;
 118         bridge->gatt_bus_addr = info->ca_gfxgart_base;
 119
 120         return 0;
 121 }
 122
 123 static int sgi_tioca_free_gatt_table(struct agp_bridge_data *bridge)
 124 {
 125         return 0;
 126 }
 127
 128 static int sgi_tioca_insert_memory(struct agp_memory *mem, off_t pg_start,
 129                                    int type)
 130 {
 131         int num_entries;
 132         size_t i;
 133         off_t j;
 134         void *temp;
 135         struct agp_bridge_data *bridge;
 136         u64 *table;
 137
 138         bridge = mem->bridge;
 139         if (!bridge)
 140                 return -EINVAL;
 141
 142         table = (u64 *)bridge->gatt_table;
 143
 144         temp = bridge->current_size;
 145
 146         switch (bridge->driver->size_type) {
 147         case U8_APER_SIZE:
 148                 num_entries = A_SIZE_8(temp)->num_entries;
 149                 break;
 150         case U16_APER_SIZE:
 151                 num_entries = A_SIZE_16(temp)->num_entries;
 152                 break;
 153         case U32_APER_SIZE:
 154                 num_entries = A_SIZE_32(temp)->num_entries;
 155                 break;
 156         case FIXED_APER_SIZE:
 157                 num_entries = A_SIZE_FIX(temp)->num_entries;
 158                 break;
 159         case LVL2_APER_SIZE:
 160                 return -EINVAL;
 161         default:
 162                 num_entries = 0;
 163                 break;
 164         }
 165
 166         num_entries -= agp_memory_reserved / PAGE_SIZE;
 167         if (num_entries < 0)
 168                 num_entries = 0;
 169
 170         if (type != 0 || mem->type != 0) {
 171                 return -EINVAL;
 172         }
 173
 174         if ((pg_start + mem->page_count) > num_entries)
 175                 return -EINVAL;
 176
 177         j = pg_start;
 178
 179         while (j < (pg_start + mem->page_count)) {
 180                 if (table[j])
 181                         return -EBUSY;
 182                 j++;
 183         }
 184
 185         if (!mem->is_flushed) {
 186                 bridge->driver->cache_flush();
 187                 mem->is_flushed = true;
 188         }
 189
 190         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 191                 table[j] =
 192                     bridge->driver->mask_memory(bridge,
 193                                                 page_to_phys(mem->pages[i]),
 194                                                 mem->type);
 195         }
 196
 197         bridge->driver->tlb_flush(mem);
 198         return 0;
 199 }
 200
 201 static int sgi_tioca_remove_memory(struct agp_memory *mem, off_t pg_start,
 202                                    int type)
 203 {
 204         size_t i;
 205         struct agp_bridge_data *bridge;
 206         u64 *table;
 207
 208         bridge = mem->bridge;
 209         if (!bridge)
 210                 return -EINVAL;
 211
 212         if (type != 0 || mem->type != 0) {
 213                 return -EINVAL;
 214         }
 215
 216         table = (u64 *)bridge->gatt_table;
 217
 218         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 219                 table[i] = 0;
 220         }
 221
 222         bridge->driver->tlb_flush(mem);
 223         return 0;
 224 }
 225
 226 static void sgi_tioca_cache_flush(void)
 227 {
 228 }
 229
 230 /*
 231  * Cleanup.  Nothing to do as the CA driver owns the GART.
 232  */
 233
 234 static void sgi_tioca_cleanup(void)
 235 {
 236 }
 237
 238 static struct agp_bridge_data *sgi_tioca_find_bridge(struct pci_dev *pdev)
 239 {
 240         struct agp_bridge_data *bridge;
 241
 242         list_for_each_entry(bridge, &agp_bridges, list) {
 243                 if (bridge->dev->bus == pdev->bus)
 244                         break;
 245         }
 246         return bridge;
 247 }
 248
 249 const struct agp_bridge_driver sgi_tioca_driver = {
 250         .owner = THIS_MODULE,
 251         .size_type = U16_APER_SIZE,
 252         .configure = sgi_tioca_configure,
 253         .fetch_size = sgi_tioca_fetch_size,
 254         .cleanup = sgi_tioca_cleanup,
 255         .tlb_flush = sgi_tioca_tlbflush,
 256         .mask_memory = sgi_tioca_mask_memory,
 257         .agp_enable = sgi_tioca_agp_enable,
 258         .cache_flush = sgi_tioca_cache_flush,
 259         .create_gatt_table = sgi_tioca_create_gatt_table,
 260         .free_gatt_table = sgi_tioca_free_gatt_table,
 261         .insert_memory = sgi_tioca_insert_memory,
 262         .remove_memory = sgi_tioca_remove_memory,
 263         .alloc_by_type = agp_generic_alloc_by_type,
 264         .free_by_type = agp_generic_free_by_type,
 265         .agp_alloc_page = sgi_tioca_alloc_page,
 266         .agp_destroy_page = agp_generic_destroy_page,
 267         .agp_type_to_mask_type  = agp_generic_type_to_mask_type,
 268         .cant_use_aperture = true,
 269         .needs_scratch_page = false,
 270         .num_aperture_sizes = 1,
 271 };
 272
 273 static int agp_sgi_init(void)
 274 {
 275         unsigned int j;
 276         struct tioca_kernel *info;
 277         struct pci_dev *pdev = NULL;
 278
 279         if (tioca_gart_found)
 280                 printk(KERN_INFO PFX "SGI TIO CA GART driver initialized.\n");
 281         else
 282                 return 0;
 283
 284         sgi_tioca_agp_bridges = kmalloc(tioca_gart_found *
 285                                         sizeof(struct agp_bridge_data *),
 286                                         GFP_KERNEL);
 287         if (!sgi_tioca_agp_bridges)
 288                 return -ENOMEM;
 289
 290         j = 0;
 291         list_for_each_entry(info, &tioca_list, ca_list) {
 292                 if (list_empty(info->ca_devices))
 293                         continue;
 294                 list_for_each_entry(pdev, info->ca_devices, bus_list) {
 295                         u8 cap_ptr;
 296
 297                         if (pdev->class != (PCI_CLASS_DISPLAY_VGA << 8))
 298                                 continue;
 299                         cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
 300                         if (!cap_ptr)
 301                                 continue;
 302                 }
 303                 sgi_tioca_agp_bridges[j] = agp_alloc_bridge();
 304                 printk(KERN_INFO PFX "bridge %d = 0x%p\n", j,
 305                        sgi_tioca_agp_bridges[j]);
 306                 if (sgi_tioca_agp_bridges[j]) {
 307                         sgi_tioca_agp_bridges[j]->dev = pdev;
 308                         sgi_tioca_agp_bridges[j]->dev_private_data = info;
 309                         sgi_tioca_agp_bridges[j]->driver = &sgi_tioca_driver;
 310                         sgi_tioca_agp_bridges[j]->gart_bus_addr =
 311                             info->ca_gfxap_base;
 312                         sgi_tioca_agp_bridges[j]->mode = (0x7D << 24) | /* 126 requests */
 313                             (0x1 << 9) |        /* SBA supported */
 314                             (0x1 << 5) |        /* 64-bit addresses supported */
 315                             (0x1 << 4) |        /* FW supported */
 316                             (0x1 << 3) |        /* AGP 3.0 mode */
 317                             0x2;        /* 8x transfer only */
 318                         sgi_tioca_agp_bridges[j]->current_size =
 319                             sgi_tioca_agp_bridges[j]->previous_size =
 320                             (void *)&sgi_tioca_sizes[0];
 321                         agp_add_bridge(sgi_tioca_agp_bridges[j]);
 322                 }
 323                 j++;
 324         }
 325
 326         agp_find_bridge = &sgi_tioca_find_bridge;
 327         return 0;
 328 }
 329
 330 static void agp_sgi_cleanup(void)
 331 {
 332         kfree(sgi_tioca_agp_bridges);
 333         sgi_tioca_agp_bridges = NULL;
 334 }
 335
 336 module_init(agp_sgi_init);
 337 module_exit(agp_sgi_cleanup);
 338
 339 MODULE_LICENSE("GPL and additional rights");