diff options
Diffstat (limited to 'arch/nios2/mm/dma-mapping.c')
| -rw-r--r-- | arch/nios2/mm/dma-mapping.c | 149 |
1 files changed, 80 insertions, 69 deletions
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c index ac5da7594f0b..90422c367ed3 100644 --- a/arch/nios2/mm/dma-mapping.c +++ b/arch/nios2/mm/dma-mapping.c @@ -20,9 +20,46 @@ #include <linux/cache.h> #include <asm/cacheflush.h> +static inline void __dma_sync_for_device(void *vaddr, size_t size, + enum dma_data_direction direction) +{ + switch (direction) { + case DMA_FROM_DEVICE: + invalidate_dcache_range((unsigned long)vaddr, + (unsigned long)(vaddr + size)); + break; + case DMA_TO_DEVICE: + /* + * We just need to flush the caches here , but Nios2 flush + * instruction will do both writeback and invalidate. + */ + case DMA_BIDIRECTIONAL: /* flush and invalidate */ + flush_dcache_range((unsigned long)vaddr, + (unsigned long)(vaddr + size)); + break; + default: + BUG(); + } +} -void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp) +static inline void __dma_sync_for_cpu(void *vaddr, size_t size, + enum dma_data_direction direction) +{ + switch (direction) { + case DMA_BIDIRECTIONAL: + case DMA_FROM_DEVICE: + invalidate_dcache_range((unsigned long)vaddr, + (unsigned long)(vaddr + size)); + break; + case DMA_TO_DEVICE: + break; + default: + BUG(); + } +} + +static void *nios2_dma_alloc(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs) { void *ret; @@ -45,24 +82,21 @@ void *dma_alloc_coherent(struct device *dev, size_t size, return ret; } -EXPORT_SYMBOL(dma_alloc_coherent); -void dma_free_coherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle) +static void nios2_dma_free(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, struct dma_attrs *attrs) { unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr); free_pages(addr, get_order(size)); } -EXPORT_SYMBOL(dma_free_coherent); -int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, - enum dma_data_direction direction) +static int nios2_dma_map_sg(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction direction, + struct dma_attrs *attrs) { int i; - BUG_ON(!valid_dma_direction(direction)); - for_each_sg(sg, sg, nents, i) { void *addr; @@ -75,40 +109,32 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, return nents; } -EXPORT_SYMBOL(dma_map_sg); -dma_addr_t dma_map_page(struct device *dev, struct page *page, +static dma_addr_t nios2_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, - enum dma_data_direction direction) + enum dma_data_direction direction, + struct dma_attrs *attrs) { - void *addr; - - BUG_ON(!valid_dma_direction(direction)); + void *addr = page_address(page) + offset; - addr = page_address(page) + offset; __dma_sync_for_device(addr, size, direction); - return page_to_phys(page) + offset; } -EXPORT_SYMBOL(dma_map_page); -void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, - enum dma_data_direction direction) +static void nios2_dma_unmap_page(struct device *dev, dma_addr_t dma_address, + size_t size, enum dma_data_direction direction, + struct dma_attrs *attrs) { - BUG_ON(!valid_dma_direction(direction)); - __dma_sync_for_cpu(phys_to_virt(dma_address), size, direction); } -EXPORT_SYMBOL(dma_unmap_page); -void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, - enum dma_data_direction direction) +static void nios2_dma_unmap_sg(struct device *dev, struct scatterlist *sg, + int nhwentries, enum dma_data_direction direction, + struct dma_attrs *attrs) { void *addr; int i; - BUG_ON(!valid_dma_direction(direction)); - if (direction == DMA_TO_DEVICE) return; @@ -118,69 +144,54 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, __dma_sync_for_cpu(addr, sg->length, direction); } } -EXPORT_SYMBOL(dma_unmap_sg); - -void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction) -{ - BUG_ON(!valid_dma_direction(direction)); - __dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction); -} -EXPORT_SYMBOL(dma_sync_single_for_cpu); - -void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction) -{ - BUG_ON(!valid_dma_direction(direction)); - - __dma_sync_for_device(phys_to_virt(dma_handle), size, direction); -} -EXPORT_SYMBOL(dma_sync_single_for_device); - -void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) +static void nios2_dma_sync_single_for_cpu(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) { - BUG_ON(!valid_dma_direction(direction)); - __dma_sync_for_cpu(phys_to_virt(dma_handle), size, direction); } -EXPORT_SYMBOL(dma_sync_single_range_for_cpu); -void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) +static void nios2_dma_sync_single_for_device(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction direction) { - BUG_ON(!valid_dma_direction(direction)); - __dma_sync_for_device(phys_to_virt(dma_handle), size, direction); } -EXPORT_SYMBOL(dma_sync_single_range_for_device); -void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, - enum dma_data_direction direction) +static void nios2_dma_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sg, int nelems, + enum dma_data_direction direction) { int i; - BUG_ON(!valid_dma_direction(direction)); - /* Make sure that gcc doesn't leave the empty loop body. */ for_each_sg(sg, sg, nelems, i) __dma_sync_for_cpu(sg_virt(sg), sg->length, direction); } -EXPORT_SYMBOL(dma_sync_sg_for_cpu); -void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, - int nelems, enum dma_data_direction direction) +static void nios2_dma_sync_sg_for_device(struct device *dev, + struct scatterlist *sg, int nelems, + enum dma_data_direction direction) { int i; - BUG_ON(!valid_dma_direction(direction)); - /* Make sure that gcc doesn't leave the empty loop body. */ for_each_sg(sg, sg, nelems, i) __dma_sync_for_device(sg_virt(sg), sg->length, direction); } -EXPORT_SYMBOL(dma_sync_sg_for_device); + +struct dma_map_ops nios2_dma_ops = { + .alloc = nios2_dma_alloc, + .free = nios2_dma_free, + .map_page = nios2_dma_map_page, + .unmap_page = nios2_dma_unmap_page, + .map_sg = nios2_dma_map_sg, + .unmap_sg = nios2_dma_unmap_sg, + .sync_single_for_device = nios2_dma_sync_single_for_device, + .sync_single_for_cpu = nios2_dma_sync_single_for_cpu, + .sync_sg_for_cpu = nios2_dma_sync_sg_for_cpu, + .sync_sg_for_device = nios2_dma_sync_sg_for_device, +}; +EXPORT_SYMBOL(nios2_dma_ops); |