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/*
* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
*
*
* Dynamic DMA mapping support.
*
* swiped from i386, and cloned for MIPS by Geert.
*
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <asm/io.h>
/*
* [jsun] We want to return non-cached area so that data can be consistent
* Apparently on x86, this is not an issue because cache is automatically
* invalidated.
*
* To make we are doing the right thing, I add some extra debug macros.
*/
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;
ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret != NULL) {
dma_cache_inv((unsigned long)ret, size);
*dma_handle = virt_to_bus(ret);
}
ret = (void*) ((unsigned long)ret | 0xA0000000);
return ret;
}
void pci_free_consistent(struct pci_dev *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
vaddr = (void*) ((unsigned long)vaddr & ~0xA0000000);
free_pages((unsigned long)vaddr, get_order(size));
}
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