static void *
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pgprot_t prot)
{
struct page *page;
void *addr;
/* Following is a work-around (a.k.a. hack) to prevent pages
* with __GFP_COMP being passed to split_page() which cannot
* handle them. The real problem is that this flag probably
* should be 0 on ARM as it is not supported on this
* platform--see CONFIG_HUGETLB_PAGE. */
gfp &= ~(__GFP_COMP);
*handle = ~0;
size = PAGE_ALIGN(size);
page = __dma_alloc_buffer(dev, size, gfp);
if (!page)
return NULL;
if (!arch_is_coherent())
addr = __dma_alloc_remap(page, size, gfp, prot);
else
addr = page_address(page);
if (addr)
*handle = pfn_to_dma(dev, page_to_pfn(page));
else
__dma_free_buffer(page, size);
return addr;
}
static void *
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pgprot_t prot)
{
struct page *page;
void *addr;
*handle = ~0;
size = PAGE_ALIGN(size);
page = __dma_alloc_buffer(dev, size, gfp);
if (!page)
return NULL;
if (!arch_is_coherent())
addr = __dma_alloc_remap(page, size, gfp, prot);
else
addr = page_address(page);
if (addr)
*handle = page_to_dma(dev, page);
else
__dma_free_buffer(page,size);
return addr;
}
/*
* free a page as defined by the above mapping.
* Must not be called with IRQs disabled.
*/
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
{
WARN_ON(irqs_disabled());
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
return;
size = PAGE_ALIGN(size);
if (!arch_is_coherent())
__dma_free_remap(cpu_addr, size);
__dma_free_buffer(pfn_to_page(dma_to_pfn(dev, handle)), size);
}
