This function return cache-line aligned allocation which is mapped
to uncached io region.
Signed-off-by: Thomas Chou <tho...@wytron.com.tw>
---
include/asm-nios2/dma-mapping.h | 21 +++++++++++++++++++++
1 files changed, 21 insertions(+), 0 deletions(-)
create mode 100644 include/asm-nios2/dma-mapping.h
diff --git a/include/asm-nios2/dma-mapping.h b/include/asm-nios2/dma-mapping.h
new file mode 100644
index 0000000..1fa19ac
--- /dev/null
+++ b/include/asm-nios2/dma-mapping.h
@@ -0,0 +1,21 @@
+#ifndef __ASM_NIOS2_DMA_MAPPING_H
+#define __ASM_NIOS2_DMA_MAPPING_H
+
+/* dma_alloc_coherent() return cache-line aligned allocation which is mapped
+ * to uncached io region.
+ *
+ * IO_REGION_BASE should be defined in board config header file
+ * 0x80000000 for nommu, 0xe0000000 for mmu
+ */
+
+static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
+{
+ void *addr = malloc(len + CONFIG_SYS_DCACHELINE_SIZE);
+ flush_dcache((unsigned long)addr, len + CONFIG_SYS_DCACHELINE_SIZE);
+ *handle = ((unsigned long)addr +
+ (CONFIG_SYS_DCACHELINE_SIZE - 1)) &
+ ~(CONFIG_SYS_DCACHELINE_SIZE - 1) & ~(IO_REGION_BASE);
+ return (void *)(*handle | IO_REGION_BASE);
+}
+
+#endif /* __ASM_NIOS2_DMA_MAPPING_H */
--
1.6.6.1
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