[PATCH] arm64: Implement arch_setup_pdev_archdata hook

[Baolin Wang]

Now on ARM64 platform, it will set 'dummy_dma_ops' for device dma_ops if
it did not call 'arch_setup_dma_ops' at device creation time by issuing
platform_device_alloc() function, that will cause failure when setting
the dma mask for device.

Hence We need to hook the archdata to setup proper dma_ops for these devices.

Signed-off-by: Baolin Wang <baolin.wang at linaro.org>
---
 arch/arm64/mm/dma-mapping.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index c566ec8..04e057b 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -26,6 +26,7 @@
 #include <linux/dma-contiguous.h>
 #include <linux/vmalloc.h>
 #include <linux/swiotlb.h>
+#include <linux/platform_device.h>
 
 #include <asm/cacheflush.h>
 
@@ -961,3 +962,23 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 	dev->archdata.dma_coherent = coherent;
 	__iommu_setup_dma_ops(dev, dma_base, size, iommu);
 }
+
+void arch_setup_pdev_archdata(struct platform_device *pdev)
+{
+	if (!pdev->dev.archdata.dma_ops)
+		pdev->dev.archdata.dma_ops = &swiotlb_dma_ops;
+
+	/*
+	 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
+	 * setup the correct supported mask.
+	 */
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	/*
+	 * Set it to coherent_dma_mask by default if the architecture
+	 * code has not set it.
+	 */
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+}
-- 
1.7.9.5