[PATCH v5 3/9] dma-mapping: add dma_{map,unmap}_resource
From: niklas.soderlund+renesas@ragnatech.se (Niklas Söderlund)
Date: 2016-03-08 02:44:44
Also in:
linux-arch, linux-iommu, linux-renesas-soc, lkml
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
Map/Unmap a device resource from a physical address. If no dma_map_ops method is available the operation is a no-op. Signed-off-by: Niklas S?derlund <niklas.soderlund+renesas@ragnatech.se> --- include/linux/dma-mapping.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e3aba4e..cc305d1 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h@@ -216,6 +216,38 @@ 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, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + unsigned long pfn = __phys_to_pfn(phys_addr); + + BUG_ON(!valid_dma_direction(dir)); + + /* Don't allow RAM to be mapped */ + BUG_ON(pfn_valid(pfn)); + + if (ops->map_resource) + return ops->map_resource(dev, phys_addr, size, dir, attrs); + + return phys_addr; +} + +static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *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); + +} + static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir)
--
2.7.2