From ae51f41d14f548d494ac41e0d21137c5a4c3f59c Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Wed, 30 Oct 2019 14:21:52 +0800
Subject: import the U-Boot code and make it compile

---
 arch/nios2/include/asm/dma-mapping.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 arch/nios2/include/asm/dma-mapping.h

(limited to 'arch/nios2/include/asm/dma-mapping.h')

diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h
new file mode 100644
index 0000000..65f67bc
--- /dev/null
+++ b/arch/nios2/include/asm/dma-mapping.h
@@ -0,0 +1,24 @@
+#ifndef __ASM_NIOS2_DMA_MAPPING_H
+#define __ASM_NIOS2_DMA_MAPPING_H
+
+#include <memalign.h>
+#include <asm/io.h>
+
+/*
+ * dma_alloc_coherent() return cache-line aligned allocation which is mapped
+ * to uncached io region.
+ */
+static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
+{
+	unsigned long addr = (unsigned long)malloc_cache_aligned(len);
+
+	if (!addr)
+		return NULL;
+
+	invalidate_dcache_range(addr, addr + len);
+	if (handle)
+		*handle = addr;
+
+	return map_physmem(addr, len, MAP_NOCACHE);
+}
+#endif /* __ASM_NIOS2_DMA_MAPPING_H */
-- 
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