/**
* \file ati_pcigart.h
* ATI PCI GART support
*
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
*
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
#if PAGE_SIZE == 65536
# define ATI_PCIGART_TABLE_ORDER 0
# define ATI_PCIGART_TABLE_PAGES (1 << 0)
#elif PAGE_SIZE == 16384
# define ATI_PCIGART_TABLE_ORDER 1
# define ATI_PCIGART_TABLE_PAGES (1 << 1)
#elif PAGE_SIZE == 8192
# define ATI_PCIGART_TABLE_ORDER 2
# define ATI_PCIGART_TABLE_PAGES (1 << 2)
#elif PAGE_SIZE == 4096
# define ATI_PCIGART_TABLE_ORDER 3
# define ATI_PCIGART_TABLE_PAGES (1 << 3)
#else
# error - PAGE_SIZE not 64K, 16K, 8K or 4K
#endif
# define ATI_MAX_PCIGART_PAGES 8192 /**< 32 MB aperture, 4K pages */
# define ATI_PCIGART_PAGE_SIZE 4096 /**< PCI GART page size */
static unsigned long drm_ati_alloc_pcigart_table( void )
{
unsigned long address;
struct page *page;
int i;
DRM_DEBUG( "%s\n", __FUNCTION__ );
address = __get_free_pages( GFP_KERNEL, ATI_PCIGART_TABLE_ORDER );
if ( address == 0UL ) {
return 0;
}
page = virt_to_page( address );
for ( i = 0 ; i < ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
get_page(page);
SetPageReserved( page );
}
DRM_DEBUG( "%s: returning 0x%08lx\n", __FUNCTION__, address );
return address;
}
static void drm_ati_free_pcigart_table( unsigned long address )
{
struct page *page;
int i;
DRM_DEBUG( "%s\n", __FUNCTION__ );
page = virt_to_page( address );
for ( i = 0 ; i < ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
__put_page(page);
ClearPageReserved( page );
}
free_pages( address, ATI_PCIGART_TABLE_ORDER );
}
int drm_ati_pcigart_cleanup( drm_device_t *dev,
unsigned long addr,
dma_addr_t bus_addr)
{
drm_sg_mem_t *entry = dev->sg;
unsigned long pages;
int i;
/* we need to support large memory configurations */
if ( !entry ) {
DRM_ERROR( "no scatter/gather memory!\n" );
return 0;
}
if ( bus_addr ) {
pci_unmap_single(dev->pdev, bus_addr,
ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
PCI_DMA_TODEVICE);
pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
? entry->pages : ATI_MAX_PCIGART_PAGES;
for ( i = 0 ; i < pages ; i++ ) {
if ( !entry->busaddr[i] ) break;
pci_unmap_single(dev->pdev, entry->busaddr[i],
PAGE_SIZE, PCI_DMA_TODEVICE);
}
}
if ( addr ) {
drm_ati_free_pcigart_table( addr );
}
return 1;
}
EXPORT_SYMBOL(drm_ati_pcigart_cleanup);
int drm_ati_pcigart_init( drm_device_t *dev,
unsigned long *addr,
dma_addr_t *bus_addr)
{
drm_sg_mem_t *entry = dev->sg;
unsigned long address = 0;
unsigned long pages;
u32 *pci_gart, page_base, bus_address = 0;
int i, j, ret = 0;
if ( !entry ) {
DRM_ERROR( "no scatter/gather memory!\n" );
goto done;
}
address = drm_ati_alloc_pcigart_table();
if ( !address ) {
DRM_ERROR( "cannot allocate PCI GART page!\n" );
goto done;
}
if ( !dev->pdev ) {
DRM_ERROR( "PCI device unknown!\n" );
goto done;
}
bus_address = pci_map_single(dev->pdev, (void *)address,
ATI_PCIGART_TABLE_PAGES * PAGE_SIZE,
PCI_DMA_TODEVICE);
if (bus_address == 0) {
DRM_ERROR( "unable to map PCIGART pages!\n" );
drm_ati_free_pcigart_table( address );
address = 0;
goto done;
}
pci_gart = (u32 *)address;
pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
? entry->pages : ATI_MAX_PCIGART_PAGES;
memset( pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32) );
for ( i = 0 ; i < pages ; i++ ) {
/* we need to support large memory configurations */
entry->busaddr[i] = pci_map_single(dev->pdev,
page_address( entry->pagelist[i] ),
PAGE_SIZE,
PCI_DMA_TODEVICE);
if (entry->busaddr[i] == 0) {
DRM_ERROR( "unable to map PCIGART pages!\n" );
drm_ati_pcigart_cleanup( dev, address, bus_address );
address = 0;
bus_address = 0;
goto done;
}
page_base = (u32) entry->busaddr[i];
for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
*pci_gart++ = cpu_to_le32( page_base );
page_base += ATI_PCIGART_PAGE_SIZE;
}
}
ret = 1;
#if defined(__i386__) || defined(__x86_64__)
wbinvd();
#else
mb();
#endif
done:
*addr = address;
*bus_addr = bus_address;
return ret;
}
EXPORT_SYMBOL(drm_ati_pcigart_init);
