1 files changed, 46 insertions, 0 deletions

diff --git a/arch/frv/include/asm/scatterlist.h b/arch/frv/include/asm/scatterlist.h
new file mode 100644
index 000000000000..4bca8a28546c
--- /dev/null
+++ b/arch/frv/include/asm/scatterlist.h
@@ -0,0 +1,46 @@
+#ifndef _ASM_SCATTERLIST_H
+#define _ASM_SCATTERLIST_H
+
+#include <asm/types.h>
+
+/*
+ * Drivers must set either ->address or (preferred) page and ->offset
+ * to indicate where data must be transferred to/from.
+ *
+ * Using page is recommended since it handles highmem data as well as
+ * low mem. ->address is restricted to data which has a virtual mapping, and
+ * it will go away in the future. Updating to page can be automated very
+ * easily -- something like
+ *
+ * sg->address = some_ptr;
+ *
+ * can be rewritten as
+ *
+ * sg_set_buf(sg, some_ptr, length);
+ *
+ * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
+ */
+struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+        unsigned long   sg_magic;
+#endif
+        unsigned long   page_link;
+        unsigned int    offset;         /* for highmem, page offset */
+
+        dma_addr_t      dma_address;
+        unsigned int    length;
+};
+
+/*
+ * 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)
+
+#define ISA_DMA_THRESHOLD (0xffffffffUL)
+
+#endif /* !_ASM_SCATTERLIST_H */