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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
parentscripts/tags.sh: handle OMAP platforms properly (diff)
downloadlinux-dev-eb17726b00b327b3c0544f6970738204f09676a4.tar.xz
linux-dev-eb17726b00b327b3c0544f6970738204f09676a4.zip
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 'arch/m32r')
-rw-r--r--arch/m32r/Kconfig2
-rw-r--r--arch/m32r/include/asm/device.h6
-rw-r--r--arch/m32r/include/asm/dma-mapping.h32
3 files changed, 38 insertions, 2 deletions
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 3cc8498fe0fe..d227a6988d6b 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -34,7 +34,7 @@ config NO_IOPORT_MAP
def_bool y
config NO_DMA
- def_bool y
+ def_bool n
config HZ
int
diff --git a/arch/m32r/include/asm/device.h b/arch/m32r/include/asm/device.h
index d8f9872b0e2d..4a9f35e0973f 100644
--- a/arch/m32r/include/asm/device.h
+++ b/arch/m32r/include/asm/device.h
@@ -3,5 +3,9 @@
*
* This file is released under the GPLv2
*/
-#include <asm-generic/device.h>
+struct dev_archdata {
+ struct dma_map_ops *dma_ops;
+};
+struct pdev_archdata {
+};
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 */