linux-kernel - [PATCH v4 2/8] dma-mapping: add {map,unmap}_resource to dma_map

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Date:	Tue, 16 Feb 2016 21:39:38 +0100
From:	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
To:	vinod.koul@...el.com, linux-renesas-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:	robin.murphy@....com, laurent.pinchart@...asonboard.com,
	geert+renesas@...der.be, linus.walleij@...aro.org,
	dan.j.williams@...el.com, arnd@...db.de,
	linux-arch@...r.kernel.org,
	Niklas Söderlund 
	<niklas.soderlund+renesas@...natech.se>
Subject: [PATCH v4 2/8] dma-mapping: add {map,unmap}_resource to dma_map_ops

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 Söderlund <niklas.soderlund+renesas@...natech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.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