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/*
* CAAM/SEC 4.x functions for using scatterlists in caam driver
*
* Copyright 2008-2011 Freescale Semiconductor, Inc.
*
*/
struct link_tbl_entry;
/*
* convert single dma address to h/w link table format
*/
static inline void sg_to_link_tbl_one(struct link_tbl_entry *link_tbl_ptr,
dma_addr_t dma, u32 len, u32 offset)
{
link_tbl_ptr->ptr = dma;
link_tbl_ptr->len = len;
link_tbl_ptr->reserved = 0;
link_tbl_ptr->buf_pool_id = 0;
link_tbl_ptr->offset = offset;
#ifdef DEBUG
print_hex_dump(KERN_ERR, "link_tbl_ptr@: ",
DUMP_PREFIX_ADDRESS, 16, 4, link_tbl_ptr,
sizeof(struct link_tbl_entry), 1);
#endif
}
/*
* convert scatterlist to h/w link table format
* but does not have final bit; instead, returns last entry
*/
static inline struct link_tbl_entry *
sg_to_link_tbl(struct scatterlist *sg, int sg_count,
struct link_tbl_entry *link_tbl_ptr, u32 offset)
{
while (sg_count) {
sg_to_link_tbl_one(link_tbl_ptr, sg_dma_address(sg),
sg_dma_len(sg), offset);
link_tbl_ptr++;
sg = sg_next(sg);
sg_count--;
}
return link_tbl_ptr - 1;
}
/*
* convert scatterlist to h/w link table format
* scatterlist must have been previously dma mapped
*/
static inline void sg_to_link_tbl_last(struct scatterlist *sg, int sg_count,
struct link_tbl_entry *link_tbl_ptr,
u32 offset)
{
link_tbl_ptr = sg_to_link_tbl(sg, sg_count, link_tbl_ptr, offset);
link_tbl_ptr->len |= LINK_TBL_LEN_FIN;
}
/* count number of elements in scatterlist */
static inline int __sg_count(struct scatterlist *sg_list, int nbytes)
{
struct scatterlist *sg = sg_list;
int sg_nents = 0;
while (nbytes > 0) {
sg_nents++;
nbytes -= sg->length;
if (!sg_is_last(sg) && (sg + 1)->length == 0)
BUG(); /* Not support chaining */
sg = scatterwalk_sg_next(sg);
}
return sg_nents;
}
/* derive number of elements in scatterlist, but return 0 for 1 */
static inline int sg_count(struct scatterlist *sg_list, int nbytes)
{
int sg_nents = __sg_count(sg_list, nbytes);
if (likely(sg_nents == 1))
return 0;
return sg_nents;
}
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