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authorRussell King <rmk+kernel@arm.linux.org.uk>2013-06-27 12:21:45 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-10-31 14:48:46 +0000
commitfa6a8d6d65b19ab44e5244ea499bcd553cc72343 (patch)
tree789f1db34489c2eed65718df5c4bbcb102c09b48
parent4ffb4318b044d175709567402a65f8ebb19f5d3b (diff)
DMA-API: provide a helper to setup DMA masks
Many drivers contain code such as: dev->dma_mask = &dev->coherent_dma_mask; dev->coherent_dma_mask = MASK; Let's move this pattern out of drivers and have the DMA API provide a helper for it. This helper uses dma_set_mask_and_coherent() to allow platform issues to be properly dealt with via dma_set_mask()/ dma_is_supported(). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--include/linux/dma-mapping.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ec951f98e3d9..27d1421ad42c 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -111,6 +111,16 @@ static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
return rc;
}
+/*
+ * Similar to the above, except it deals with the case where the device
+ * does not have dev->dma_mask appropriately setup.
+ */
+static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
+{
+ dev->dma_mask = &dev->coherent_dma_mask;
+ return dma_set_mask_and_coherent(dev, mask);
+}
+
extern u64 dma_get_required_mask(struct device *dev);
static inline unsigned int dma_get_max_seg_size(struct device *dev)