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/* ati_pcigart.h -- ATI PCI GART support -*- linux-c -*-

 * 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.

 *

 * Authors:

 *   Gareth Hughes <gareth@valinux.com>

 */

#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++ ) {

                atomic_inc( &page->count );

                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++ ) {

                atomic_dec( &page->count );

                ClearPageReserved( page );

        }

        free_pages( address, ATI_PCIGART_TABLE_ORDER );

}

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__)

        asm volatile ( "wbinvd" ::: "memory" );

#else

        mb();

#endif

done:

        *addr = address;

        *bus_addr = bus_address;

        return ret;

}

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;

}