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[karo-tx-linux.git] / drivers / crypto / caam / sg_sw_sec4.h
1 /*
2  * CAAM/SEC 4.x functions for using scatterlists in caam driver
3  *
4  * Copyright 2008-2011 Freescale Semiconductor, Inc.
5  *
6  */
7
8 struct sec4_sg_entry;
9
10 /*
11  * convert single dma address to h/w link table format
12  */
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)
15 {
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;
20 #ifdef DEBUG
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);
24 #endif
25 }
26
27 /*
28  * convert scatterlist to h/w link table format
29  * but does not have final bit; instead, returns last entry
30  */
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)
34 {
35         while (sg_count) {
36                 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
37                                    sg_dma_len(sg), offset);
38                 sec4_sg_ptr++;
39                 sg = sg_next(sg);
40                 sg_count--;
41         }
42         return sec4_sg_ptr - 1;
43 }
44
45 /*
46  * convert scatterlist to h/w link table format
47  * scatterlist must have been previously dma mapped
48  */
49 static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count,
50                                       struct sec4_sg_entry *sec4_sg_ptr,
51                                       u32 offset)
52 {
53         sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
54         sec4_sg_ptr->len |= SEC4_SG_LEN_FIN;
55 }
56
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)
60 {
61         do {
62                 unsigned int len = min(sg_dma_len(sg), total);
63
64                 dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
65                 sec4_sg_ptr++;
66                 sg = sg_next(sg);
67                 total -= len;
68         } while (total);
69         return sec4_sg_ptr - 1;
70 }
71
72 /* derive number of elements in scatterlist, but return 0 for 1 */
73 static inline int sg_count(struct scatterlist *sg_list, int nbytes)
74 {
75         int sg_nents = sg_nents_for_len(sg_list, nbytes);
76
77         if (likely(sg_nents == 1))
78                 return 0;
79
80         return sg_nents;
81 }