1 files changed, 92 insertions, 0 deletions
diff --git a/backport-include/linux/dma-mapping.h b/backport-include/linux/dma-mapping.h
new file mode 100644
index 0000000..e5d1d3e
--- /dev/null
+++ b/backport-include/linux/dma-mapping.h
@@ -0,0 +1,92 @@
+#ifndef __BACKPORT_LINUX_DMA_MAPPING_H
+#define __BACKPORT_LINUX_DMA_MAPPING_H
+#include_next <linux/dma-mapping.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
+static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
+					dma_addr_t *dma_handle, gfp_t flag)
+{
+	void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
+	if (ret)
+		memset(ret, 0, size);
+	return ret;
+}
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+/* only include this if DEFINE_DMA_UNMAP_ADDR is not set as debian squeeze also backports this  */
+#ifndef DEFINE_DMA_UNMAP_ADDR
+#ifdef CONFIG_NEED_DMA_MAP_STATE
+#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
+#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
+#define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
+#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
+#define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
+#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
+#else
+#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
+#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
+#define dma_unmap_addr(PTR, ADDR_NAME)           (0)
+#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
+#define dma_unmap_len(PTR, LEN_NAME)             (0)
+#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
+#endif
+#endif
+
+/* mask dma_set_coherent_mask as debian squeeze also backports this */
+#define dma_set_coherent_mask LINUX_BACKPORT(dma_set_coherent_mask)
+
+static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+	if (!dma_supported(dev, mask))
+		return -EIO;
+	dev->coherent_dma_mask = mask;
+	return 0;
+}
+#endif /* < 2.6.34 */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
+#include <backport/magic.h>
+/* These really belong to asm/dma-mapping.h but it doesn't really matter */
+/* On 2.6.27 a second argument was added, on older kernels we ignore it */
+static inline int dma_mapping_error1(dma_addr_t dma_addr)
+{
+	/* use an inline to grab the old definition */
+	return dma_mapping_error(dma_addr);
+}
+
+#define dma_mapping_error2(pdef, dma_addr) \
+	dma_mapping_error1(dma_addr)
+
+#undef dma_mapping_error
+#define dma_mapping_error(...) \
+	macro_dispatcher(dma_mapping_error, __VA_ARGS__)(__VA_ARGS__)
+
+/* This kinda belongs into asm/dma-mapping.h or so, but doesn't matter */
+#ifdef CONFIG_ARM
+
+/*
+ * The caller asks to handle a range between offset and offset + size,
+ * but we process a larger range from 0 to offset + size due to lack of
+ * offset support.
+ */
+
+static inline void dma_sync_single_range_for_cpu(struct device *dev,
+		dma_addr_t handle, unsigned long offset, size_t size,
+		enum dma_data_direction dir)
+{
+	dma_sync_single_for_cpu(dev, handle, offset + size, dir);
+}
+
+static inline void dma_sync_single_range_for_device(struct device *dev,
+		dma_addr_t handle, unsigned long offset, size_t size,
+		enum dma_data_direction dir)
+{
+	dma_sync_single_for_device(dev, handle, offset + size, dir);
+}
+
+#endif /* arm */
+#endif
+
+#endif /* __BACKPORT_LINUX_DMA_MAPPING_H */