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;
}
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;
}
void *cma_map_kernel(u32 phys_addr, size_t size)
{
pgprot_t prot = __get_dma_pgprot(NULL, pgprot_kernel);
struct page *page = phys_to_page(phys_addr);
void *ptr = NULL;
if (unlikely(phys_addr < mem_start || phys_addr > mem_start + mem_size)) {
pr_err("%s(%d) err: phys_addr 0x%x invalid!\n", __func__, __LINE__, phys_addr);
return NULL;
}
// BUG_ON(unlikely(!pfn_valid(__phys_to_pfn(phys_addr))));
size = PAGE_ALIGN(size);
if (PageHighMem(page)) {
ptr = __dma_alloc_remap(page, size, GFP_KERNEL, prot, __builtin_return_address(0));
if (!ptr) {
pr_err("%s(%d) err: __dma_alloc_remap failed!\n", __func__, __LINE__);
return NULL;
}
} else {
__dma_remap(page, size, prot);
ptr = page_address(page);
}
return ptr;
}
