diff options
Diffstat (limited to 'arch/m68knommu/kernel/dma.c')
-rw-r--r-- | arch/m68knommu/kernel/dma.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/m68knommu/kernel/dma.c b/arch/m68knommu/kernel/dma.c new file mode 100644 index 0000000..14b19c4 --- /dev/null +++ b/arch/m68knommu/kernel/dma.c @@ -0,0 +1,36 @@ +/* + * Dynamic DMA mapping support. + * + * We never have any address translations to worry about, so this + * is just alloc/free. + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pci.h> +#include <asm/io.h> + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, int gfp) +{ + void *ret; + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dev == NULL || (*dev->dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *)__get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + return ret; +} + +void dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + free_pages((unsigned long)vaddr, get_order(size)); +} |