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-rw-r--r--include/asm-arm/scatterlist.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/asm-arm/scatterlist.h b/include/asm-arm/scatterlist.h
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+++ b/include/asm-arm/scatterlist.h
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+#ifndef _ASMARM_SCATTERLIST_H
+#define _ASMARM_SCATTERLIST_H
+
+#include <asm/memory.h>
+#include <asm/types.h>
+
+struct scatterlist {
+ struct page *page; /* buffer page */
+ unsigned int offset; /* buffer offset */
+ dma_addr_t dma_address; /* dma address */
+ unsigned int length; /* length */
+ char *__address; /* for set_dma_addr */
+};
+
+/*
+ * These macros should be used after a pci_map_sg call has been done
+ * to get bus addresses of each of the SG entries and their lengths.
+ * You should only work with the number of sg entries pci_map_sg
+ * returns, or alternatively stop on the first sg_dma_len(sg) which
+ * is 0.
+ */
+#define sg_dma_address(sg) ((sg)->dma_address)
+#define sg_dma_len(sg) ((sg)->length)
+
+#endif /* _ASMARM_SCATTERLIST_H */