[PATCH v4 2/8] dma-mapping: add {map,unmap}_resource to dma_map_ops
From: niklas.soderlund+renesas@ragnatech.se (Niklas Söderlund)
Date: 2016-02-16 20:40:22
Also in:
linux-arch, linux-iommu, linux-renesas-soc, lkml
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
Add methods to handle mapping of device resources from a physical address. This is needed for example to be able to map MMIO FIFO registers to a IOMMU. Signed-off-by: Niklas S?derlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- include/linux/dma-mapping.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 75857cd..e3aba4e 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h@@ -49,6 +49,12 @@ struct dma_map_ops { struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); + dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs); + void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs); void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir);
--
2.7.1