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 /* count number of elements in scatterlist */
73 static inline int __sg_count(struct scatterlist *sg_list, int nbytes,
76 struct scatterlist *sg = sg_list;
82 if (!sg_is_last(sg) && (sg + 1)->length == 0)
90 /* derive number of elements in scatterlist, but return 0 for 1 */
91 static inline int sg_count(struct scatterlist *sg_list, int nbytes,
94 int sg_nents = __sg_count(sg_list, nbytes, chained);
96 if (likely(sg_nents == 1))
102 static inline void dma_unmap_sg_chained(
103 struct device *dev, struct scatterlist *sg, unsigned int nents,
104 enum dma_data_direction dir, bool chained)
106 if (unlikely(chained)) {
108 struct scatterlist *tsg = sg;
111 * Use a local copy of the sg pointer to avoid moving the
112 * head of the list pointed to by sg as we walk the list.
114 for (i = 0; i < nents; i++) {
115 dma_unmap_sg(dev, tsg, 1, dir);
119 dma_unmap_sg(dev, sg, nents, dir);
123 static inline int dma_map_sg_chained(
124 struct device *dev, struct scatterlist *sg, unsigned int nents,
125 enum dma_data_direction dir, bool chained)
127 if (unlikely(chained)) {
129 struct scatterlist *tsg = sg;
132 * Use a local copy of the sg pointer to avoid moving the
133 * head of the list pointed to by sg as we walk the list.
135 for (i = 0; i < nents; i++) {
136 if (!dma_map_sg(dev, tsg, 1, dir)) {
137 dma_unmap_sg_chained(dev, sg, i, dir,
146 nents = dma_map_sg(dev, sg, nents, dir);