path: root/arch/m32r/include/asm/dma-mapping.h
diff options
authorSudip Mukherjee <sudipm.mukherjee@gmail.com>2016-12-12 16:40:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 18:55:06 -0800
commiteb17726b00b327b3c0544f6970738204f09676a4 (patch)
tree41006e529c67a83e8f27e76e89b18d9947652240 /arch/m32r/include/asm/dma-mapping.h
parentscripts/tags.sh: handle OMAP platforms properly (diff)
m32r: add simple dma
Some builds of m32r were failing as it tried to build few drivers which needed dma but m32r is not having dma support. Objections were raised when it was tried to make those drivers depend on HAS_DMA. So the next best thing is to add dma support to m32r. dma_noop is a very simple dma with 1:1 memory mapping. Link: http://lkml.kernel.org/r/1475949198-31623-1-git-send-email-sudipm.mukherjee@gmail.com Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/m32r/include/asm/dma-mapping.h b/arch/m32r/include/asm/dma-mapping.h
new file mode 100644
index 000000000000..2c43a77fe942
--- /dev/null
+++ b/arch/m32r/include/asm/dma-mapping.h
@@ -0,0 +1,32 @@
+#ifndef _ASM_M32R_DMA_MAPPING_H
+#define _ASM_M32R_DMA_MAPPING_H
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-debug.h>
+#include <linux/io.h>
+#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+ if (dev && dev->archdata.dma_ops)
+ return dev->archdata.dma_ops;
+ return &dma_noop_ops;
+static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction)
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+ if (!dev->dma_mask)
+ return false;
+ return addr + size - 1 <= *dev->dma_mask;
+#endif /* _ASM_M32R_DMA_MAPPING_H */