mirror of https://gitee.com/openkylin/linux.git
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
|
|
* CAAM/SEC 4.x functions for using scatterlists in caam driver
|
|
*
|
|
* Copyright 2008-2011 Freescale Semiconductor, Inc.
|
|
*
|
|
*/
|
|
|
|
#include "regs.h"
|
|
|
|
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, u16 offset)
|
|
{
|
|
sec4_sg_ptr->ptr = cpu_to_caam_dma(dma);
|
|
sec4_sg_ptr->len = cpu_to_caam32(len);
|
|
sec4_sg_ptr->bpid_offset = cpu_to_caam32(offset & SEC4_SG_OFFSET_MASK);
|
|
#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, u16 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,
|
|
u16 offset)
|
|
{
|
|
sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset);
|
|
sec4_sg_ptr->len |= cpu_to_caam32(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;
|
|
}
|