From 6f3d87968f9c8b529bc81eff5a1f45e92553493d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= Date: Wed, 10 Aug 2016 13:22:16 +0200 Subject: dma-mapping: add dma_{map,unmap}_resource MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Map/Unmap a device MMIO resource from a physical address. If no dma_map_ops method is available the operation is a no-op. Signed-off-by: Niklas Söderlund Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul --- include/linux/dma-mapping.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'include/linux/dma-mapping.h') diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 673b7be85f7a..6e00c7fdbbd3 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -264,6 +264,42 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, debug_dma_unmap_page(dev, addr, size, dir, false); } +static inline dma_addr_t dma_map_resource(struct device *dev, + phys_addr_t phys_addr, + size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + unsigned long pfn = __phys_to_pfn(phys_addr); + dma_addr_t addr; + + BUG_ON(!valid_dma_direction(dir)); + + /* Don't allow RAM to be mapped */ + BUG_ON(pfn_valid(pfn)); + + addr = phys_addr; + if (ops->map_resource) + addr = ops->map_resource(dev, phys_addr, size, dir, attrs); + + debug_dma_map_resource(dev, phys_addr, size, dir, addr); + + return addr; +} + +static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->unmap_resource) + ops->unmap_resource(dev, addr, size, dir, attrs); + debug_dma_unmap_resource(dev, addr, size, dir); +} + static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) -- cgit v1.2.3