139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* ati_pcigart.h -- ATI PCI GART support -*- linux-c -*-
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* Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
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*
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Gareth Hughes <gareth@valinux.com>
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*/
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#define __NO_VERSION__
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#include "drmP.h"
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#if PAGE_SIZE == 8192
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# define ATI_PCIGART_TABLE_ORDER 2
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# define ATI_PCIGART_TABLE_PAGES (1 << 2)
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#elif PAGE_SIZE == 4096
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# define ATI_PCIGART_TABLE_ORDER 3
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# define ATI_PCIGART_TABLE_PAGES (1 << 3)
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#elif
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# error - PAGE_SIZE not 8K or 4K
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#endif
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# define ATI_MAX_PCIGART_PAGES 8192 /* 32 MB aperture, 4K pages */
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# define ATI_PCIGART_PAGE_SIZE 4096 /* PCI GART page size */
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static unsigned long DRM(ati_alloc_pcigart_table)( void )
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{
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unsigned long address;
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struct page *page;
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int i;
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DRM_DEBUG( "%s\n", __FUNCTION__ );
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address = __get_free_pages( GFP_KERNEL, ATI_PCIGART_TABLE_ORDER );
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if ( address == 0UL ) {
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return 0;
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}
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page = virt_to_page( address );
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for ( i = 0 ; i <= ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
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atomic_inc( &page->count );
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SetPageReserved( page );
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}
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DRM_DEBUG( "%s: returning 0x%08lx\n", __FUNCTION__, address );
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return address;
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}
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static void DRM(ati_free_pcigart_table)( unsigned long address )
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{
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struct page *page;
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int i;
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DRM_DEBUG( "%s\n", __FUNCTION__ );
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if ( !address ) return;
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page = virt_to_page( address );
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for ( i = 0 ; i <= ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
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atomic_dec( &page->count );
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ClearPageReserved( page );
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}
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free_pages( address, ATI_PCIGART_TABLE_ORDER );
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}
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unsigned long DRM(ati_pcigart_init)( drm_device_t *dev )
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{
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drm_sg_mem_t *entry = dev->sg;
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unsigned long address;
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unsigned long pages;
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u32 *pci_gart, page_base;
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int i, j;
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if ( !entry ) {
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DRM_ERROR( "no scatter/gather memory!\n" );
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return 0;
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}
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address = DRM(ati_alloc_pcigart_table)();
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if ( !address ) {
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DRM_ERROR( "cannot allocate PCI GART page!\n" );
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return 0;
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}
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pci_gart = (u32 *)address;
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pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
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? entry->pages : ATI_MAX_PCIGART_PAGES;
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memset( pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32) );
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for ( i = 0 ; i < pages ; i++ ) {
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page_base = virt_to_bus( entry->pagelist[i]->virtual );
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for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
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*pci_gart++ = cpu_to_le32( page_base );
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page_base += ATI_PCIGART_PAGE_SIZE;
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}
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}
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#if __i386__
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asm volatile ( "wbinvd" ::: "memory" );
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#else
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mb();
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#endif
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return address;
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}
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int DRM(ati_pcigart_cleanup)( unsigned long address )
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{
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if ( address ) {
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DRM(ati_free_pcigart_table)( address );
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}
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return 0;
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}
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