82 строки
2.0 KiB
C
82 строки
2.0 KiB
C
/*
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* CAAM/SEC 4.x functions for using scatterlists in caam driver
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*
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* Copyright 2008-2011 Freescale Semiconductor, Inc.
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*
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*/
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struct sec4_sg_entry;
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/*
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* convert single dma address to h/w link table format
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*/
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static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr,
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dma_addr_t dma, u32 len, u32 offset)
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{
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sec4_sg_ptr->ptr = dma;
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sec4_sg_ptr->len = len;
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sec4_sg_ptr->buf_pool_id = 0;
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sec4_sg_ptr->offset = offset;
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#ifdef DEBUG
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print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ",
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DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr,
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sizeof(struct sec4_sg_entry), 1);
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#endif
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}
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/*
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* convert scatterlist to h/w link table format
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* but does not have final bit; instead, returns last entry
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*/
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static inline struct sec4_sg_entry *
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sg_to_sec4_sg(struct scatterlist *sg, int sg_count,
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struct sec4_sg_entry *sec4_sg_ptr, u32 offset)
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{
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while (sg_count) {
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dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
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sg_dma_len(sg), offset);
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sec4_sg_ptr++;
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sg = sg_next(sg);
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sg_count--;
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}
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return sec4_sg_ptr - 1;
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}
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/*
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* convert scatterlist to h/w link table format
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* scatterlist must have been previously dma mapped
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*/
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static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count,
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struct sec4_sg_entry *sec4_sg_ptr,
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u32 offset)
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{
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sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
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sec4_sg_ptr->len |= SEC4_SG_LEN_FIN;
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}
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static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
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struct scatterlist *sg, unsigned int total,
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struct sec4_sg_entry *sec4_sg_ptr)
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{
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do {
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unsigned int len = min(sg_dma_len(sg), total);
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dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
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sec4_sg_ptr++;
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sg = sg_next(sg);
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total -= len;
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} while (total);
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return sec4_sg_ptr - 1;
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}
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/* derive number of elements in scatterlist, but return 0 for 1 */
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static inline int sg_count(struct scatterlist *sg_list, int nbytes)
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{
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int sg_nents = sg_nents_for_len(sg_list, nbytes);
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if (likely(sg_nents == 1))
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return 0;
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return sg_nents;
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}
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