2 * CAAM/SEC 4.x functions for using scatterlists in caam driver
4 * Copyright 2008-2011 Freescale Semiconductor, Inc.
11 * convert single dma address to h/w link table format
13 static inline void sg_to_link_tbl_one(struct link_tbl_entry *link_tbl_ptr,
14 dma_addr_t dma, u32 len, u32 offset)
16 link_tbl_ptr->ptr = dma;
17 link_tbl_ptr->len = len;
18 link_tbl_ptr->reserved = 0;
19 link_tbl_ptr->buf_pool_id = 0;
20 link_tbl_ptr->offset = offset;
22 print_hex_dump(KERN_ERR, "link_tbl_ptr@: ",
23 DUMP_PREFIX_ADDRESS, 16, 4, link_tbl_ptr,
24 sizeof(struct link_tbl_entry), 1);
29 * convert scatterlist to h/w link table format
30 * but does not have final bit; instead, returns last entry
32 static inline struct link_tbl_entry *
33 sg_to_link_tbl(struct scatterlist *sg, int sg_count,
34 struct link_tbl_entry *link_tbl_ptr, u32 offset)
37 sg_to_link_tbl_one(link_tbl_ptr, sg_dma_address(sg),
38 sg_dma_len(sg), offset);
43 return link_tbl_ptr - 1;
47 * convert scatterlist to h/w link table format
48 * scatterlist must have been previously dma mapped
50 static inline void sg_to_link_tbl_last(struct scatterlist *sg, int sg_count,
51 struct link_tbl_entry *link_tbl_ptr,
54 link_tbl_ptr = sg_to_link_tbl(sg, sg_count, link_tbl_ptr, offset);
55 link_tbl_ptr->len |= LINK_TBL_LEN_FIN;
58 /* count number of elements in scatterlist */
59 static inline int __sg_count(struct scatterlist *sg_list, int nbytes)
61 struct scatterlist *sg = sg_list;
67 if (!sg_is_last(sg) && (sg + 1)->length == 0)
68 BUG(); /* Not support chaining */
69 sg = scatterwalk_sg_next(sg);
75 /* derive number of elements in scatterlist, but return 0 for 1 */
76 static inline int sg_count(struct scatterlist *sg_list, int nbytes)
78 int sg_nents = __sg_count(sg_list, nbytes);
80 if (likely(sg_nents == 1))