Commit | Line | Data |
---|---|---|
4c1ec1f9 YK |
1 | /* |
2 | * CAAM/SEC 4.x functions for using scatterlists in caam driver | |
3 | * | |
4 | * Copyright 2008-2011 Freescale Semiconductor, Inc. | |
5 | * | |
6 | */ | |
7 | ||
261ea058 HG |
8 | #include "regs.h" |
9 | ||
a299c837 | 10 | struct sec4_sg_entry; |
4c1ec1f9 YK |
11 | |
12 | /* | |
13 | * convert single dma address to h/w link table format | |
14 | */ | |
a299c837 | 15 | static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr, |
bd52f1c2 | 16 | dma_addr_t dma, u32 len, u16 offset) |
4c1ec1f9 | 17 | { |
261ea058 HG |
18 | sec4_sg_ptr->ptr = cpu_to_caam_dma(dma); |
19 | sec4_sg_ptr->len = cpu_to_caam32(len); | |
20 | sec4_sg_ptr->bpid_offset = cpu_to_caam32(offset & SEC4_SG_OFFSET_MASK); | |
4c1ec1f9 | 21 | #ifdef DEBUG |
a299c837 YK |
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); | |
4c1ec1f9 YK |
25 | #endif |
26 | } | |
27 | ||
28 | /* | |
29 | * convert scatterlist to h/w link table format | |
30 | * but does not have final bit; instead, returns last entry | |
31 | */ | |
a299c837 YK |
32 | static inline struct sec4_sg_entry * |
33 | sg_to_sec4_sg(struct scatterlist *sg, int sg_count, | |
bd52f1c2 | 34 | struct sec4_sg_entry *sec4_sg_ptr, u16 offset) |
4c1ec1f9 YK |
35 | { |
36 | while (sg_count) { | |
a299c837 | 37 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), |
4c1ec1f9 | 38 | sg_dma_len(sg), offset); |
a299c837 | 39 | sec4_sg_ptr++; |
5be4d4c9 | 40 | sg = sg_next(sg); |
4c1ec1f9 YK |
41 | sg_count--; |
42 | } | |
a299c837 | 43 | return sec4_sg_ptr - 1; |
4c1ec1f9 YK |
44 | } |
45 | ||
46 | /* | |
47 | * convert scatterlist to h/w link table format | |
48 | * scatterlist must have been previously dma mapped | |
49 | */ | |
a299c837 YK |
50 | static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count, |
51 | struct sec4_sg_entry *sec4_sg_ptr, | |
bd52f1c2 | 52 | u16 offset) |
4c1ec1f9 | 53 | { |
a299c837 | 54 | sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset); |
261ea058 | 55 | sec4_sg_ptr->len |= cpu_to_caam32(SEC4_SG_LEN_FIN); |
4c1ec1f9 YK |
56 | } |
57 | ||
70c3c8a9 HX |
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) | |
61 | { | |
62 | do { | |
63 | unsigned int len = min(sg_dma_len(sg), total); | |
64 | ||
65 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0); | |
66 | sec4_sg_ptr++; | |
67 | sg = sg_next(sg); | |
68 | total -= len; | |
69 | } while (total); | |
70 | return sec4_sg_ptr - 1; | |
71 | } | |
72 | ||
4c1ec1f9 | 73 | /* derive number of elements in scatterlist, but return 0 for 1 */ |
13fb8fd7 | 74 | static inline int sg_count(struct scatterlist *sg_list, int nbytes) |
4c1ec1f9 | 75 | { |
13fb8fd7 | 76 | int sg_nents = sg_nents_for_len(sg_list, nbytes); |
4c1ec1f9 YK |
77 | |
78 | if (likely(sg_nents == 1)) | |
79 | return 0; | |
80 | ||
81 | return sg_nents; | |
82 | } |