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->reserved = 0;
19 sec4_sg_ptr->buf_pool_id = 0;
20 sec4_sg_ptr->offset = offset;
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, u32 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 |= 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 /* count number of elements in scatterlist */
74 static inline int __sg_count(struct scatterlist *sg_list, int nbytes,
77 struct scatterlist *sg = sg_list;
83 if (!sg_is_last(sg) && (sg + 1)->length == 0)
91 /* derive number of elements in scatterlist, but return 0 for 1 */
92 static inline int sg_count(struct scatterlist *sg_list, int nbytes,
95 int sg_nents = __sg_count(sg_list, nbytes, chained);
97 if (likely(sg_nents == 1))
103 static inline void dma_unmap_sg_chained(
104 struct device *dev, struct scatterlist *sg, unsigned int nents,
105 enum dma_data_direction dir, bool chained)
107 if (unlikely(chained)) {
109 for (i = 0; i < nents; i++) {
110 dma_unmap_sg(dev, sg, 1, dir);
114 dma_unmap_sg(dev, sg, nents, dir);
118 static inline int dma_map_sg_chained(
119 struct device *dev, struct scatterlist *sg, unsigned int nents,
120 enum dma_data_direction dir, bool chained)
122 struct scatterlist *first = sg;
124 if (unlikely(chained)) {
126 for (i = 0; i < nents; i++) {
127 if (!dma_map_sg(dev, sg, 1, dir)) {
128 dma_unmap_sg_chained(dev, first, i, dir,
137 nents = dma_map_sg(dev, sg, nents, dir);