Expose the DMA operations functions. Until now only the dma_ops structs in a whole or some dma operation were exposed. This patch exposes all the dma coherents operations. They can be reused when an architecture or a driver need to create its own set of dma_operation.
Signed-off-by: Gregory CLEMENT <[email protected]> --- arch/arm/include/asm/dma-mapping.h | 48 ++++++++++++++++++++++++++++++++++++ arch/arm/mm/dma-mapping.c | 25 ++++--------------- 2 files changed, 53 insertions(+), 20 deletions(-) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 2300484..b12d7c0 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -112,6 +112,54 @@ static inline void dma_free_noncoherent(struct device *dev, size_t size, extern int dma_supported(struct device *dev, u64 mask); /** + * arm_dma_map_page - map a portion of a page for streaming DMA + * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices + * @page: page that buffer resides in + * @offset: offset into page for start of buffer + * @size: size of buffer to map + * @dir: DMA transfer direction + * + * Ensure that any data held in the cache is appropriately discarded + * or written back. + * + * The device owns this memory once this call has completed. The CPU + * can regain ownership by calling dma_unmap_page(). + */ +extern dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs); + +/** + * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() + * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices + * @handle: DMA address of buffer + * @size: size of buffer (same as passed to dma_map_page) + * @dir: DMA transfer direction (same as passed to dma_map_page) + * + * Unmap a page streaming mode DMA translation. The handle and size + * must match what was provided in the previous dma_map_page() call. + * All other usages are undefined. + * + * After this call, reads by the CPU to the buffer are guaranteed to see + * whatever the device wrote there. + */ +extern void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs); + +extern void arm_dma_sync_single_for_cpu(struct device *dev, + dma_addr_t handle, size_t size, + enum dma_data_direction dir); + +extern void arm_dma_sync_single_for_device(struct device *dev, + dma_addr_t handle, size_t size, + enum dma_data_direction dir); + +extern int arm_dma_set_mask(struct device *dev, u64 dma_mask); + + +/** * arm_dma_alloc - allocate consistent memory for DMA * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices * @size: required memory size diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 58bc3e4..dbb67ce 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -56,20 +56,13 @@ static void __dma_page_dev_to_cpu(struct page *, unsigned long, size_t, enum dma_data_direction); /** - * arm_dma_map_page - map a portion of a page for streaming DMA - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @page: page that buffer resides in - * @offset: offset into page for start of buffer - * @size: size of buffer to map - * @dir: DMA transfer direction - * * Ensure that any data held in the cache is appropriately discarded * or written back. * * The device owns this memory once this call has completed. The CPU * can regain ownership by calling dma_unmap_page(). */ -static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, +dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) { @@ -86,12 +79,6 @@ static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *pag } /** - * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() - * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices - * @handle: DMA address of buffer - * @size: size of buffer (same as passed to dma_map_page) - * @dir: DMA transfer direction (same as passed to dma_map_page) - * * Unmap a page streaming mode DMA translation. The handle and size * must match what was provided in the previous dma_map_page() call. * All other usages are undefined. @@ -99,7 +86,7 @@ static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *pag * After this call, reads by the CPU to the buffer are guaranteed to see * whatever the device wrote there. */ -static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, +void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) { @@ -108,7 +95,7 @@ static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, handle & ~PAGE_MASK, size, dir); } -static void arm_dma_sync_single_for_cpu(struct device *dev, +void arm_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { unsigned int offset = handle & (PAGE_SIZE - 1); @@ -116,7 +103,7 @@ static void arm_dma_sync_single_for_cpu(struct device *dev, __dma_page_dev_to_cpu(page, offset, size, dir); } -static void arm_dma_sync_single_for_device(struct device *dev, +void arm_dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { unsigned int offset = handle & (PAGE_SIZE - 1); @@ -124,8 +111,6 @@ static void arm_dma_sync_single_for_device(struct device *dev, __dma_page_cpu_to_dev(page, offset, size, dir); } -static int arm_dma_set_mask(struct device *dev, u64 dma_mask); - struct dma_map_ops arm_dma_ops = { .alloc = arm_dma_alloc, .free = arm_dma_free, @@ -971,7 +956,7 @@ int dma_supported(struct device *dev, u64 mask) } EXPORT_SYMBOL(dma_supported); -static int arm_dma_set_mask(struct device *dev, u64 dma_mask) +int arm_dma_set_mask(struct device *dev, u64 dma_mask) { if (!dev->dma_mask || !dma_supported(dev, dma_mask)) return -EIO; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
