1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/crypto/caam/sg_link_tbl.h b/drivers/crypto/caam/sg_link_tbl.h
new file mode 100644
index 000000000000..6df434922460
--- /dev/null
+++ b/drivers/crypto/caam/sg_link_tbl.h
@@ -0,0 +1,84 @@
+/*
+ * CAAM/SEC 4.x functions for using scatterlists in caam driver
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ */
+
+struct link_tbl_entry;
+
+/*
+ * convert single dma address to h/w link table format
+ */
+static inline void sg_to_link_tbl_one(struct link_tbl_entry *link_tbl_ptr,
+                                      dma_addr_t dma, u32 len, u32 offset)
+{
+        link_tbl_ptr->ptr = dma;
+        link_tbl_ptr->len = len;
+        link_tbl_ptr->reserved = 0;
+        link_tbl_ptr->buf_pool_id = 0;
+        link_tbl_ptr->offset = offset;
+#ifdef DEBUG
+        print_hex_dump(KERN_ERR, "link_tbl_ptr@: ",
+                       DUMP_PREFIX_ADDRESS, 16, 4, link_tbl_ptr,
+                       sizeof(struct link_tbl_entry), 1);
+#endif
+}
+
+/*
+ * convert scatterlist to h/w link table format
+ * but does not have final bit; instead, returns last entry
+ */
+static inline struct link_tbl_entry *
+sg_to_link_tbl(struct scatterlist *sg, int sg_count,
+               struct link_tbl_entry *link_tbl_ptr, u32 offset)
+{
+        while (sg_count) {
+                sg_to_link_tbl_one(link_tbl_ptr, sg_dma_address(sg),
+                                   sg_dma_len(sg), offset);
+                link_tbl_ptr++;
+                sg = sg_next(sg);
+                sg_count--;
+        }
+        return link_tbl_ptr - 1;
+}
+
+/*
+ * convert scatterlist to h/w link table format
+ * scatterlist must have been previously dma mapped
+ */
+static inline void sg_to_link_tbl_last(struct scatterlist *sg, int sg_count,
+                                       struct link_tbl_entry *link_tbl_ptr,
+                                       u32 offset)
+{
+        link_tbl_ptr = sg_to_link_tbl(sg, sg_count, link_tbl_ptr, offset);
+        link_tbl_ptr->len |= LINK_TBL_LEN_FIN;
+}
+
+/* count number of elements in scatterlist */
+static inline int __sg_count(struct scatterlist *sg_list, int nbytes)
+{
+        struct scatterlist *sg = sg_list;
+        int sg_nents = 0;
+
+        while (nbytes > 0) {
+                sg_nents++;
+                nbytes -= sg->length;
+                if (!sg_is_last(sg) && (sg + 1)->length == 0)
+                        BUG(); /* Not support chaining */
+                sg = scatterwalk_sg_next(sg);
+        }
+
+        return sg_nents;
+}
+
+/* derive number of elements in scatterlist, but return 0 for 1 */
+static inline int sg_count(struct scatterlist *sg_list, int nbytes)
+{
+        int sg_nents = __sg_count(sg_list, nbytes);
+
+        if (likely(sg_nents == 1))
+                return 0;
+
+        return sg_nents;
+}