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kernel/linux-rt-4.4.41/drivers/crypto/caam/sg_sw_sec4.h 1.97 KB
5113f6f70   김현기   kernel add
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  /*
   * CAAM/SEC 4.x functions for using scatterlists in caam driver
   *
   * Copyright 2008-2011 Freescale Semiconductor, Inc.
   *
   */
  
  struct sec4_sg_entry;
  
  /*
   * convert single dma address to h/w link table format
   */
  static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr,
  				      dma_addr_t dma, u32 len, u32 offset)
  {
  	sec4_sg_ptr->ptr = dma;
  	sec4_sg_ptr->len = len;
  	sec4_sg_ptr->buf_pool_id = 0;
  	sec4_sg_ptr->offset = offset;
  #ifdef DEBUG
  	print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ",
  		       DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr,
  		       sizeof(struct sec4_sg_entry), 1);
  #endif
  }
  
  /*
   * convert scatterlist to h/w link table format
   * but does not have final bit; instead, returns last entry
   */
  static inline struct sec4_sg_entry *
  sg_to_sec4_sg(struct scatterlist *sg, int sg_count,
  	      struct sec4_sg_entry *sec4_sg_ptr, u32 offset)
  {
  	while (sg_count) {
  		dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg),
  				   sg_dma_len(sg), offset);
  		sec4_sg_ptr++;
  		sg = sg_next(sg);
  		sg_count--;
  	}
  	return sec4_sg_ptr - 1;
  }
  
  /*
   * convert scatterlist to h/w link table format
   * scatterlist must have been previously dma mapped
   */
  static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count,
  				      struct sec4_sg_entry *sec4_sg_ptr,
  				      u32 offset)
  {
  	sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
  	sec4_sg_ptr->len |= SEC4_SG_LEN_FIN;
  }
  
  static inline struct sec4_sg_entry *sg_to_sec4_sg_len(
  	struct scatterlist *sg, unsigned int total,
  	struct sec4_sg_entry *sec4_sg_ptr)
  {
  	do {
  		unsigned int len = min(sg_dma_len(sg), total);
  
  		dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0);
  		sec4_sg_ptr++;
  		sg = sg_next(sg);
  		total -= len;
  	} while (total);
  	return sec4_sg_ptr - 1;
  }
  
  /* 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_nents_for_len(sg_list, nbytes);
  
  	if (likely(sg_nents == 1))
  		return 0;
  
  	return sg_nents;
  }