Hi Niklas,
Thanks for doing this, it looks good. Just a couple of minor comments on
this and the next patch...
On 10/02/16 00:57, Niklas Söderlund wrote:
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 Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
include/linux/dma-mapping.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e3aba4e..21bf986 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -216,6 +216,33 @@ 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);
+
+ BUG_ON(!valid_dma_direction(dir));
I think it would be worth also having the same inverse pfn_valid() check
as ioremap() here, to make sure this is similarly hard to misuse.
Robin.
+ 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)
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