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