From 6090912c4abcfc6c81b156cf2bb4cda23ae6e847 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 24 Mar 2011 20:50:06 +0000 Subject: powerpc: Implement dma_mmap_coherent() This is used by Alsa to mmap buffers allocated with dma_alloc_coherent() into userspace. We need a special variant to handle machines with non-coherent DMAs as those buffers have "special" virt addresses and require non-cachable mappings Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/dma-mapping.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/powerpc/include/asm/dma-mapping.h') diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h index 6d2416a..dd70fac 100644 --- a/arch/powerpc/include/asm/dma-mapping.h +++ b/arch/powerpc/include/asm/dma-mapping.h @@ -42,6 +42,7 @@ extern void __dma_free_coherent(size_t size, void *vaddr); extern void __dma_sync(void *vaddr, size_t size, int direction); extern void __dma_sync_page(struct page *page, unsigned long offset, size_t size, int direction); +extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr); #else /* ! CONFIG_NOT_COHERENT_CACHE */ /* @@ -198,6 +199,11 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) +extern int dma_mmap_coherent(struct device *, struct vm_area_struct *, + void *, dma_addr_t, size_t); +#define ARCH_HAS_DMA_MMAP_COHERENT + + static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { -- cgit v1.1