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 dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr,
14 dma_addr_t dma, u32 len, u32 offset)
16 sec4_sg_ptr->ptr = dma;
17 sec4_sg_ptr->len = len;
18 sec4_sg_ptr->buf_pool_id = 0;
19 sec4_sg_ptr->offset = offset;
21 print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ",
22 DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr,
23 sizeof(struct sec4_sg_entry), 1);
28 * convert scatterlist to h/w link table format
29 * but does not have final bit; instead, returns last entry
31 static inline struct sec4_sg_entry *
32 sg_to_sec4_sg(struct scatterlist *sg, int sg_count,
33 struct sec4_sg_entry *sec4_sg_ptr, u32 offset)
36 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
37 sg_dma_len(sg), offset);
42 return sec4_sg_ptr - 1;
46 * convert scatterlist to h/w link table format
47 * scatterlist must have been previously dma mapped
49 static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count,
50 struct sec4_sg_entry *sec4_sg_ptr,
53 sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
54 sec4_sg_ptr->len |= SEC4_SG_LEN_FIN;
57 static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
58 struct scatterlist *sg, unsigned int total,
59 struct sec4_sg_entry *sec4_sg_ptr)
62 unsigned int len = min(sg_dma_len(sg), total);
64 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
69 return sec4_sg_ptr - 1;
72 /* derive number of elements in scatterlist, but return 0 for 1 */
73 static inline int sg_count(struct scatterlist *sg_list, int nbytes)
75 int sg_nents = sg_nents_for_len(sg_list, nbytes);
77 if (likely(sg_nents == 1))