2 * CAAM/SEC 4.x functions for using scatterlists in caam driver
4 * Copyright 2008-2011 Freescale Semiconductor, Inc.
13 * convert single dma address to h/w link table format
15 static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr,
16 dma_addr_t dma, u32 len, u16 offset)
18 sec4_sg_ptr->ptr = cpu_to_caam_dma64(dma);
19 sec4_sg_ptr->len = cpu_to_caam32(len);
20 sec4_sg_ptr->bpid_offset = cpu_to_caam32(offset & SEC4_SG_OFFSET_MASK);
22 print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ",
23 DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr,
24 sizeof(struct sec4_sg_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 sec4_sg_entry *
33 sg_to_sec4_sg(struct scatterlist *sg, int sg_count,
34 struct sec4_sg_entry *sec4_sg_ptr, u16 offset)
37 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
38 sg_dma_len(sg), offset);
43 return sec4_sg_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_sec4_sg_last(struct scatterlist *sg, int sg_count,
51 struct sec4_sg_entry *sec4_sg_ptr,
54 sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
55 sec4_sg_ptr->len |= cpu_to_caam32(SEC4_SG_LEN_FIN);
58 static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
59 struct scatterlist *sg, unsigned int total,
60 struct sec4_sg_entry *sec4_sg_ptr)
63 unsigned int len = min(sg_dma_len(sg), total);
65 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
70 return sec4_sg_ptr - 1;
73 /* derive number of elements in scatterlist, but return 0 for 1 */
74 static inline int sg_count(struct scatterlist *sg_list, int nbytes)
76 int sg_nents = sg_nents_for_len(sg_list, nbytes);
78 if (likely(sg_nents == 1))