GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/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 */