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/* $Id: dma.c,v 1.1 2000/02/18 00:24:30 ralf Exp $
*
* Dynamic DMA mapping support.
*
* On RM200 there is no hardware dynamic DMA address translation,
* so consistent alloc/free are merely page allocation/freeing.
* The rest of the dynamic DMA mapping interface is implemented
* in <asm/pci.h>.
*
* These routines assume that the RM has all it's memory at physical
* addresses of < 512mb.
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <asm/io.h>
void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
dma_addr_t *dma_handle)
{
void *ret;
int gfp = GFP_ATOMIC;
int order = get_order(size);
if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
gfp |= GFP_DMA;
ret = (void *)__get_free_pages(gfp, order);
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_bus(ret);
}
dma_cache_wback_inv(ret, PAGE_SIZE << order);
return KSEG1ADDR(ret);
}
void pci_free_consistent(struct pci_dev *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
free_pages((unsigned long)vaddr, get_order(size));
}
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