1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sh/kernel/dma-coherent.c b/arch/sh/kernel/dma-coherent.c
new file mode 100644
index 000000000..6a44c0e7b
--- /dev/null
+++ b/arch/sh/kernel/dma-coherent.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2004 - 2007  Paul Mundt
+ */
+#include <linux/mm.h>
+#include <linux/dma-map-ops.h>
+#include <asm/cacheflush.h>
+#include <asm/addrspace.h>
+
+void arch_dma_prep_coherent(struct page *page, size_t size)
+{
+	__flush_purge_region(page_address(page), size);
+}
+
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+		enum dma_data_direction dir)
+{
+	void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
+
+	switch (dir) {
+	case DMA_FROM_DEVICE:		/* invalidate only */
+		__flush_invalidate_region(addr, size);
+		break;
+	case DMA_TO_DEVICE:		/* writeback only */
+		__flush_wback_region(addr, size);
+		break;
+	case DMA_BIDIRECTIONAL:		/* writeback and invalidate */
+		__flush_purge_region(addr, size);
+		break;
+	default:
+		BUG();
+	}
+}