[PATCH 5/7] of: Add set_arch_dma_coherent_ops() and setup coherent dma_ops

[Santosh Shilimkar]

Add set_arch_dma_coherent_ops() for architectures to setup coherent dma_ops.
Update dt_dma_configure() to look for a "dma-coherent" property in the
device's node, and its ancestors If this property is found, we call
set_arch_dma_coherent_ops() per device to apply coherent DMA configuartion.

The set_arch_dma_coherent_ops() is declared as __weak and it's expected
that the arch's needing it will imlepment it.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Olof Johansson <olof@xxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
---
 drivers/of/platform.c       |    5 +++++
 include/linux/dma-mapping.h |    7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 53bb12f..272e390 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -255,6 +255,11 @@ static void dt_dma_configure(struct device *dev)
 		dev_err(dev, "failed to set coherent DMA mask %pad\n",
 			&dma_mask);
 	}
+
+	if (of_dma_is_coherent(dev->of_node)) {
+		set_arch_dma_coherent_ops(dev);
+		dev_dbg(dev, "device is dma coherent\n");
+	}
 }
 
 /**
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index fd4aee2..c7d9b1b 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -123,6 +123,13 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 
 extern u64 dma_get_required_mask(struct device *dev);
 
+#ifndef set_arch_dma_coherent_ops
+static inline int set_arch_dma_coherent_ops(struct device *dev)
+{
+	return 0;
+}
+#endif
+
 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 {
 	return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
-- 
1.7.9.5

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