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 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,
  95                               unsigned long addr,
  96                               dma_addr_t bus_addr)
  97 {
  98         drm_sg_mem_t *entry = dev->sg;
  99         unsigned long pages;
 100         int i;
 101
 102         /* we need to support large memory configurations */
 103         if ( !entry ) {
 104                 DRM_ERROR( "no scatter/gather memory!\n" );
 105                 return 0;
 106         }
 107
 108         if ( bus_addr ) {
 109                 pci_unmap_single(dev->pdev, bus_addr,
 110                                  ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 111                                  PCI_DMA_TODEVICE);
 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
 123         if ( addr ) {
 124                 drm_ati_free_pcigart_table( addr );
 125         }
 126
 127         return 1;
 128 }
 129 EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
 130
 131 int drm_ati_pcigart_init( drm_device_t *dev,
 132                            unsigned long *addr,
 133                            dma_addr_t *bus_addr)
 134 {
 135         drm_sg_mem_t *entry = dev->sg;
 136         unsigned long address = 0;
 137         unsigned long pages;
 138         u32 *pci_gart, page_base, bus_address = 0;
 139         int i, j, ret = 0;
 140
 141         if ( !entry ) {
 142                 DRM_ERROR( "no scatter/gather memory!\n" );
 143                 goto done;
 144         }
 145
 146         address = drm_ati_alloc_pcigart_table();
 147         if ( !address ) {
 148                 DRM_ERROR( "cannot allocate PCI GART page!\n" );
 149                 goto done;
 150         }
 151
 152         if ( !dev->pdev ) {
 153                 DRM_ERROR( "PCI device unknown!\n" );
 154                 goto done;
 155         }
 156
 157         bus_address = pci_map_single(dev->pdev, (void *)address,
 158                                   ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
 159                                   PCI_DMA_TODEVICE);
 160         if (bus_address == 0) {
 161                 DRM_ERROR( "unable to map PCIGART pages!\n" );
 162                 drm_ati_free_pcigart_table( address );
 163                 address = 0;
 164                 goto done;
 165         }
 166
 167         pci_gart = (u32 *)address;
 168
 169         pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
 170                 ? entry->pages : ATI_MAX_PCIGART_PAGES;
 171
 172         memset( pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32) );
 173
 174         for ( i = 0 ; i < pages ; i++ ) {
 175                 /* we need to support large memory configurations */
 176                 entry->busaddr[i] = pci_map_single(dev->pdev,
 177                                            page_address( entry->pagelist[i] ),
 178                                            PAGE_SIZE,
 179                                            PCI_DMA_TODEVICE);
 180                 if (entry->busaddr[i] == 0) {
 181                         DRM_ERROR( "unable to map PCIGART pages!\n" );
 182                         drm_ati_pcigart_cleanup( dev, address, bus_address );
 183                         address = 0;
 184                         bus_address = 0;
 185                         goto done;
 186                 }
 187                 page_base = (u32) entry->busaddr[i];
 188
 189                 for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
 190                         *pci_gart++ = cpu_to_le32( page_base );
 191                         page_base += ATI_PCIGART_PAGE_SIZE;
 192                 }
 193         }
 194
 195         ret = 1;
 196
 197 #if defined(__i386__) || defined(__x86_64__)
 198         wbinvd();
 199 #else
 200         mb();
 201 #endif
 202
 203 done:
 204         *addr = address;
 205         *bus_addr = bus_address;
 206         return ret;
 207 }
 208 EXPORT_SYMBOL(drm_ati_pcigart_init);