drivers/char/drm/ati_pcigart.c

   1 /**
   2  * \file ati_pcigart.h
   3  * ATI PCI GART support
   4  *
   5  * \author Gareth Hughes <gareth@valinux.com>
   6  */
   7
   8 /*
   9  * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
  10  *
  11  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  */
  33
  34 #include "drmP.h"
  35
  36 #if PAGE_SIZE == 65536
  37 # define ATI_PCIGART_TABLE_ORDER        0
  38 # define ATI_PCIGART_TABLE_PAGES        (1 << 0)
  39 #elif PAGE_SIZE == 16384
  40 # define ATI_PCIGART_TABLE_ORDER        1
  41 # define ATI_PCIGART_TABLE_PAGES        (1 << 1)
  42 #elif PAGE_SIZE == 8192
  43 # define ATI_PCIGART_TABLE_ORDER        2
  44 # define ATI_PCIGART_TABLE_PAGES        (1 << 2)
  45 #elif PAGE_SIZE == 4096
  46 # define ATI_PCIGART_TABLE_ORDER        3
  47 # define ATI_PCIGART_TABLE_PAGES        (1 << 3)
  48 #else
  49 # error - PAGE_SIZE not 64K, 16K, 8K or 4K
  50 #endif
  51
  52 # define ATI_MAX_PCIGART_PAGES          8192    /**< 32 MB aperture, 4K pages */
  53 # define ATI_PCIGART_PAGE_SIZE          4096    /**< PCI GART page size */
  54
  55 static unsigned long drm_ati_alloc_pcigart_table( void )
  56 {
  57         unsigned long address;
  58         struct page *page;
  59         int i;
  60         DRM_DEBUG( "%s\n", __FUNCTION__ );
  61
  62         address = __get_free_pages( GFP_KERNEL, ATI_PCIGART_TABLE_ORDER );
  63         if ( address == 0UL ) {
  64                 return 0;
  65         }
  66
  67         page = virt_to_page( address );
  68
  69         for ( i = 0 ; i < ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
  70                 get_page(page);
  71                 SetPageReserved( page );
  72         }
  73
  74         DRM_DEBUG( "%s: returning 0x%08lx\n", __FUNCTION__, address );
  75         return address;
  76 }
  77
  78 static void drm_ati_free_pcigart_table( unsigned long address )
  79 {
  80         struct page *page;
  81         int i;
  82         DRM_DEBUG( "%s\n", __FUNCTION__ );
  83
  84         page = virt_to_page( address );
  85
  86         for ( i = 0 ; i < ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
  87                 __put_page(page);
  88                 ClearPageReserved( page );
  89         }
  90
  91         free_pages( address, ATI_PCIGART_TABLE_ORDER );
  92 }
  93
  94 int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
  95 {
  96         drm_sg_mem_t *entry = dev->sg;
  97         unsigned long pages;
  98         int i;
  99
 100         /* we need to support large memory configurations */
 101         if ( !entry ) {
 102                 DRM_ERROR( "no scatter/gather memory!\n" );
 103                 return 0;
 104         }
 105
 106         if (gart_info->bus_addr) {
 107                 if (gart_info->gart_table_location==DRM_ATI_GART_MAIN) {
 108                         pci_unmap_single(dev->pdev, gart_info->bus_addr,
 109                                          ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 110                                          PCI_DMA_TODEVICE);
 111                 }
 112
 113                 pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
 114                         ? entry->pages : ATI_MAX_PCIGART_PAGES;
 115
 116                 for ( i = 0 ; i < pages ; i++ ) {
 117                         if ( !entry->busaddr[i] ) break;
 118                         pci_unmap_single(dev->pdev, entry->busaddr[i],
 119                                          PAGE_SIZE, PCI_DMA_TODEVICE);
 120                 }
 121
 122                 if (gart_info->gart_table_location==DRM_ATI_GART_MAIN)
 123                         gart_info->bus_addr=0;
 124         }
 125
 126         if (gart_info->gart_table_location==DRM_ATI_GART_MAIN && gart_info->addr) {
 127                 drm_ati_free_pcigart_table(gart_info->addr);
 128                 gart_info->addr=0;
 129         }
 130
 131         return 1;
 132 }
 133 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
 134
 135 int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
 136 {
 137         drm_sg_mem_t *entry = dev->sg;
 138         unsigned long address = 0;
 139         unsigned long pages;
 140         u32 *pci_gart, page_base, bus_address = 0;
 141         int i, j, ret = 0;
 142
 143         if ( !entry ) {
 144                 DRM_ERROR( "no scatter/gather memory!\n" );
 145                 goto done;
 146         }
 147
 148         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
 149         {
 150                 DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 151
 152                 address = drm_ati_alloc_pcigart_table();
 153                 if ( !address ) {
 154                         DRM_ERROR( "cannot allocate PCI GART page!\n" );
 155                         goto done;
 156                 }
 157
 158                 if ( !dev->pdev ) {
 159                         DRM_ERROR( "PCI device unknown!\n" );
 160                         goto done;
 161                 }
 162
 163                 bus_address = pci_map_single(dev->pdev, (void *)address,
 164                                              ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 165                                              PCI_DMA_TODEVICE);
 166                 if (bus_address == 0) {
 167                         DRM_ERROR( "unable to map PCIGART pages!\n" );
 168                         drm_ati_free_pcigart_table( address );
 169                         address = 0;
 170                         goto done;
 171                 }
 172         }
 173         else
 174         {
 175                 address = gart_info->addr;
 176                 bus_address = gart_info->bus_addr;
 177                 DRM_DEBUG("PCI: Gart Table: VRAM %08X mapped at %08lX\n", bus_address, address);
 178         }
 179
 180         pci_gart = (u32 *)address;
 181
 182         pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
 183                 ? entry->pages : ATI_MAX_PCIGART_PAGES;
 184
 185         memset( pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32) );
 186
 187         for ( i = 0 ; i < pages ; i++ ) {
 188                 /* we need to support large memory configurations */
 189                 entry->busaddr[i] = pci_map_single(dev->pdev,
 190                                            page_address( entry->pagelist[i] ),
 191                                            PAGE_SIZE,
 192                                            PCI_DMA_TODEVICE);
 193                 if (entry->busaddr[i] == 0) {
 194                         DRM_ERROR( "unable to map PCIGART pages!\n" );
 195                         drm_ati_pcigart_cleanup(dev, gart_info);
 196                         address = 0;
 197                         bus_address = 0;
 198                         goto done;
 199                 }
 200                 page_base = (u32) entry->busaddr[i];
 201
 202                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 203                         if (gart_info->is_pcie)
 204                                 *pci_gart = (cpu_to_le32(page_base)>>8) | 0xc;
 205                         else
 206                                 *pci_gart++ = cpu_to_le32( page_base );
 207                         page_base += ATI_PCIGART_PAGE_SIZE;
 208                 }
 209         }
 210
 211         ret = 1;
 212
 213 #if defined(__i386__) || defined(__x86_64__)
 214         wbinvd();
 215 #else
 216         mb();
 217 #endif
 218
 219 done:
 220         gart_info->addr = address;
 221         gart_info->bus_addr = bus_address;
 222         return ret;
 223 }
 224 EXPORT_SYMBOL(drm_ati_pcigart_init);