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/init.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 void *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 == NULL) {
  51                 return 0;
  52         }
  53
  54         get_page(page);
  55         SetPageLocked(page);
  56         atomic_inc(&agp_bridge->current_memory_agp);
  57         return page_address(page);
  58 }
  59
  60 /*
  61  * Flush GART tlb's.  Cannot selectively flush based on memory so the mem
  62  * arg is ignored.
  63  */
  64
  65 static void sgi_tioca_tlbflush(struct agp_memory *mem)
  66 {
  67         tioca_tlbflush(mem->bridge->dev_private_data);
  68 }
  69
  70 /*
  71  * Given an address of a host physical page, turn it into a valid gart
  72  * entry.
  73  */
  74 static unsigned long
  75 sgi_tioca_mask_memory(struct agp_bridge_data *bridge,
  76                       unsigned long addr, int type)
  77 {
  78         return tioca_physpage_to_gart(addr);
  79 }
  80
  81 static void sgi_tioca_agp_enable(struct agp_bridge_data *bridge, u32 mode)
  82 {
  83         tioca_fastwrite_enable(bridge->dev_private_data);
  84 }
  85
  86 /*
  87  * sgi_tioca_configure() doesn't have anything to do since the base CA driver
  88  * has alreay set up the GART.
  89  */
  90
  91 static int sgi_tioca_configure(void)
  92 {
  93         return 0;
  94 }
  95
  96 /*
  97  * Determine gfx aperature size.  This has already been determined by the
  98  * CA driver init, so just need to set agp_bridge values accordingly.
  99  */
 100
 101 static int sgi_tioca_fetch_size(void)
 102 {
 103         struct tioca_kernel *info =
 104             (struct tioca_kernel *)agp_bridge->dev_private_data;
 105
 106         sgi_tioca_sizes[0].size = info->ca_gfxap_size / MB(1);
 107         sgi_tioca_sizes[0].num_entries = info->ca_gfxgart_entries;
 108
 109         return sgi_tioca_sizes[0].size;
 110 }
 111
 112 static int sgi_tioca_create_gatt_table(struct agp_bridge_data *bridge)
 113 {
 114         struct tioca_kernel *info =
 115             (struct tioca_kernel *)bridge->dev_private_data;
 116
 117         bridge->gatt_table_real = (u32 *) info->ca_gfxgart;
 118         bridge->gatt_table = bridge->gatt_table_real;
 119         bridge->gatt_bus_addr = info->ca_gfxgart_base;
 120
 121         return 0;
 122 }
 123
 124 static int sgi_tioca_free_gatt_table(struct agp_bridge_data *bridge)
 125 {
 126         return 0;
 127 }
 128
 129 static int sgi_tioca_insert_memory(struct agp_memory *mem, off_t pg_start,
 130                                    int type)
 131 {
 132         int num_entries;
 133         size_t i;
 134         off_t j;
 135         void *temp;
 136         struct agp_bridge_data *bridge;
 137         u64 *table;
 138
 139         bridge = mem->bridge;
 140         if (!bridge)
 141                 return -EINVAL;
 142
 143         table = (u64 *)bridge->gatt_table;
 144
 145         temp = bridge->current_size;
 146
 147         switch (bridge->driver->size_type) {
 148         case U8_APER_SIZE:
 149                 num_entries = A_SIZE_8(temp)->num_entries;
 150                 break;
 151         case U16_APER_SIZE:
 152                 num_entries = A_SIZE_16(temp)->num_entries;
 153                 break;
 154         case U32_APER_SIZE:
 155                 num_entries = A_SIZE_32(temp)->num_entries;
 156                 break;
 157         case FIXED_APER_SIZE:
 158                 num_entries = A_SIZE_FIX(temp)->num_entries;
 159                 break;
 160         case LVL2_APER_SIZE:
 161                 return -EINVAL;
 162                 break;
 163         default:
 164                 num_entries = 0;
 165                 break;
 166         }
 167
 168         num_entries -= agp_memory_reserved / PAGE_SIZE;
 169         if (num_entries < 0)
 170                 num_entries = 0;
 171
 172         if (type != 0 || mem->type != 0) {
 173                 return -EINVAL;
 174         }
 175
 176         if ((pg_start + mem->page_count) > num_entries)
 177                 return -EINVAL;
 178
 179         j = pg_start;
 180
 181         while (j < (pg_start + mem->page_count)) {
 182                 if (table[j])
 183                         return -EBUSY;
 184                 j++;
 185         }
 186
 187         if (mem->is_flushed == FALSE) {
 188                 bridge->driver->cache_flush();
 189                 mem->is_flushed = TRUE;
 190         }
 191
 192         for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
 193                 table[j] =
 194                     bridge->driver->mask_memory(bridge, mem->memory[i],
 195                                                 mem->type);
 196         }
 197
 198         bridge->driver->tlb_flush(mem);
 199         return 0;
 200 }
 201
 202 static int sgi_tioca_remove_memory(struct agp_memory *mem, off_t pg_start,
 203                                    int type)
 204 {
 205         size_t i;
 206         struct agp_bridge_data *bridge;
 207         u64 *table;
 208
 209         bridge = mem->bridge;
 210         if (!bridge)
 211                 return -EINVAL;
 212
 213         if (type != 0 || mem->type != 0) {
 214                 return -EINVAL;
 215         }
 216
 217         table = (u64 *)bridge->gatt_table;
 218
 219         for (i = pg_start; i < (mem->page_count + pg_start); i++) {
 220                 table[i] = 0;
 221         }
 222
 223         bridge->driver->tlb_flush(mem);
 224         return 0;
 225 }
 226
 227 static void sgi_tioca_cache_flush(void)
 228 {
 229 }
 230
 231 /*
 232  * Cleanup.  Nothing to do as the CA driver owns the GART.
 233  */
 234
 235 static void sgi_tioca_cleanup(void)
 236 {
 237 }
 238
 239 static struct agp_bridge_data *sgi_tioca_find_bridge(struct pci_dev *pdev)
 240 {
 241         struct agp_bridge_data *bridge;
 242
 243         list_for_each_entry(bridge, &agp_bridges, list) {
 244                 if (bridge->dev->bus == pdev->bus)
 245                         break;
 246         }
 247         return bridge;
 248 }
 249
 250 struct agp_bridge_driver sgi_tioca_driver = {
 251         .owner = THIS_MODULE,
 252         .size_type = U16_APER_SIZE,
 253         .configure = sgi_tioca_configure,
 254         .fetch_size = sgi_tioca_fetch_size,
 255         .cleanup = sgi_tioca_cleanup,
 256         .tlb_flush = sgi_tioca_tlbflush,
 257         .mask_memory = sgi_tioca_mask_memory,
 258         .agp_enable = sgi_tioca_agp_enable,
 259         .cache_flush = sgi_tioca_cache_flush,
 260         .create_gatt_table = sgi_tioca_create_gatt_table,
 261         .free_gatt_table = sgi_tioca_free_gatt_table,
 262         .insert_memory = sgi_tioca_insert_memory,
 263         .remove_memory = sgi_tioca_remove_memory,
 264         .alloc_by_type = agp_generic_alloc_by_type,
 265         .free_by_type = agp_generic_free_by_type,
 266         .agp_alloc_page = sgi_tioca_alloc_page,
 267         .agp_destroy_page = agp_generic_destroy_page,
 268         .cant_use_aperture = 1,
 269         .needs_scratch_page = 0,
 270         .num_aperture_sizes = 1,
 271 };
 272
 273 static int __devinit 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 =
 285             (struct agp_bridge_data **)kmalloc(tioca_gart_found *
 286                                                sizeof(struct agp_bridge_data *),
 287                                                GFP_KERNEL);
 288
 289         j = 0;
 290         list_for_each_entry(info, &tioca_list, ca_list) {
 291                 struct list_head *tmp;
 292                 if (list_empty(info->ca_devices))
 293                         continue;
 294                 list_for_each(tmp, info->ca_devices) {
 295                         u8 cap_ptr;
 296                         pdev = pci_dev_b(tmp);
 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 __devexit 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");