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-rw-r--r--arch/microblaze/kernel/dma.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
new file mode 100644
index 0000000000..04d091ade4
--- /dev/null
+++ b/arch/microblaze/kernel/dma.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2009-2010 PetaLogix
+ * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
+ *
+ * Provide default implementations of the DMA mapping callbacks for
+ * directly mapped busses.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-map-ops.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <linux/bug.h>
+#include <asm/cacheflush.h>
+
+static void __dma_sync(phys_addr_t paddr, size_t size,
+ enum dma_data_direction direction)
+{
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ case DMA_BIDIRECTIONAL:
+ flush_dcache_range(paddr, paddr + size);
+ break;
+ case DMA_FROM_DEVICE:
+ invalidate_dcache_range(paddr, paddr + size);
+ break;
+ default:
+ BUG();
+ }
+}
+
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ __dma_sync(paddr, size, dir);
+}
+
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
+{
+ __dma_sync(paddr, size, dir);
+}