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authorMaxime Ripard <maxime.ripard@free-electrons.com>2015-05-27 16:01:52 +0200
committerVinod Koul <vinod.koul@intel.com>2015-06-12 18:13:13 +0530
commit87d001ef5366c4a24f7a1340246c4ce68190581c (patch)
tree2a4b7fdfc6d18461ab5562ab1f01f4505349e5ae /include/linux/dmaengine.h
parent6007ccb57744fdd393385b135e7b7cea9bd4bd6b (diff)
downloadlwn-87d001ef5366c4a24f7a1340246c4ce68190581c.tar.gz
lwn-87d001ef5366c4a24f7a1340246c4ce68190581c.zip
dmaengine: Move icg helpers to global header
Now that we can have ICGs set for both the source and destination (using the icg field of struct data_chunk) or for only the source or the destination (using the dst_icg or src_icg respectively), and that these fields can be ignored depending on other parameters (src_inc, src_sgl, etc.), the logic to get the actual ICG value can be quite tricky. The XDMAC driver was already implementing it, but since we will need it in other drivers, we can move it to the main header file. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index ad419757241f..499c530bcbaa 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -874,6 +874,33 @@ static inline int dma_maxpq(struct dma_device *dma, enum dma_ctrl_flags flags)
BUG();
}
+static inline size_t dmaengine_get_icg(bool inc, bool sgl, size_t icg,
+ size_t dir_icg)
+{
+ if (inc) {
+ if (dir_icg)
+ return dir_icg;
+ else if (sgl)
+ return icg;
+ }
+
+ return 0;
+}
+
+static inline size_t dmaengine_get_dst_icg(struct dma_interleaved_template *xt,
+ struct data_chunk *chunk)
+{
+ return dmaengine_get_icg(xt->dst_inc, xt->dst_sgl,
+ chunk->icg, chunk->dst_icg);
+}
+
+static inline size_t dmaengine_get_src_icg(struct dma_interleaved_template *xt,
+ struct data_chunk *chunk)
+{
+ return dmaengine_get_icg(xt->src_inc, xt->src_sgl,
+ chunk->icg, chunk->src_icg);
+}
+
/* --- public DMA engine API --- */
#ifdef CONFIG_DMA_ENGINE