pci-dma.c 958 Bytes
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/*
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 * BK Id: %F% %I% %G% %U% %#%
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 */
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/*
 * Copyright (C) 2000   Ani Joshi <ajoshi@unixbox.com>
 *
 *
 * Dynamic DMA mapping support.
 *
 * swiped from i386
 *
 */

#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;

	if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
		gfp |= GFP_DMA;
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#ifdef CONFIG_NOT_COHERENT_CACHE
	ret = consistent_alloc(gfp, size, dma_handle);
#else
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	ret = (void *)__get_free_pages(gfp, get_order(size));
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#endif
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	if (ret != NULL) {
		memset(ret, 0, size);
		*dma_handle = virt_to_bus(ret);
	}
	return ret;
}

void pci_free_consistent(struct pci_dev *hwdev, size_t size,
			 void *vaddr, dma_addr_t dma_handle)
{
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#ifdef CONFIG_NOT_COHERENT_CACHE
	consistent_free(vaddr);
#else
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	free_pages((unsigned long)vaddr, get_order(size));
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#endif
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}