157 lines
3.9 KiB
C
157 lines
3.9 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->reserved = 0;
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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 = scatterwalk_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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/* count number of elements in scatterlist */
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static inline int __sg_count(struct scatterlist *sg_list, int nbytes,
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bool *chained)
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{
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struct scatterlist *sg = sg_list;
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int sg_nents = 0;
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while (nbytes > 0) {
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sg_nents++;
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nbytes -= sg->length;
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if (!sg_is_last(sg) && (sg + 1)->length == 0)
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*chained = true;
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sg = scatterwalk_sg_next(sg);
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}
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return sg_nents;
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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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bool *chained)
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{
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int sg_nents = __sg_count(sg_list, nbytes, chained);
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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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static int dma_map_sg_chained(struct device *dev, struct scatterlist *sg,
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unsigned int nents, enum dma_data_direction dir,
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bool chained)
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{
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if (unlikely(chained)) {
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int i;
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for (i = 0; i < nents; i++) {
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dma_map_sg(dev, sg, 1, dir);
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sg = scatterwalk_sg_next(sg);
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}
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} else {
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dma_map_sg(dev, sg, nents, dir);
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}
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return nents;
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}
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static int dma_unmap_sg_chained(struct device *dev, struct scatterlist *sg,
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unsigned int nents, enum dma_data_direction dir,
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bool chained)
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{
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if (unlikely(chained)) {
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int i;
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for (i = 0; i < nents; i++) {
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dma_unmap_sg(dev, sg, 1, dir);
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sg = scatterwalk_sg_next(sg);
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}
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} else {
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dma_unmap_sg(dev, sg, nents, dir);
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}
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return nents;
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}
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/* Copy from len bytes of sg to dest, starting from beginning */
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static inline void sg_copy(u8 *dest, struct scatterlist *sg, unsigned int len)
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{
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struct scatterlist *current_sg = sg;
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int cpy_index = 0, next_cpy_index = current_sg->length;
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while (next_cpy_index < len) {
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memcpy(dest + cpy_index, (u8 *) sg_virt(current_sg),
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current_sg->length);
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current_sg = scatterwalk_sg_next(current_sg);
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cpy_index = next_cpy_index;
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next_cpy_index += current_sg->length;
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}
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if (cpy_index < len)
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memcpy(dest + cpy_index, (u8 *) sg_virt(current_sg),
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len - cpy_index);
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}
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/* Copy sg data, from to_skip to end, to dest */
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static inline void sg_copy_part(u8 *dest, struct scatterlist *sg,
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int to_skip, unsigned int end)
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{
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struct scatterlist *current_sg = sg;
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int sg_index, cpy_index;
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sg_index = current_sg->length;
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while (sg_index <= to_skip) {
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current_sg = scatterwalk_sg_next(current_sg);
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sg_index += current_sg->length;
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}
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cpy_index = sg_index - to_skip;
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memcpy(dest, (u8 *) sg_virt(current_sg) +
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current_sg->length - cpy_index, cpy_index);
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current_sg = scatterwalk_sg_next(current_sg);
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if (end - sg_index)
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sg_copy(dest + cpy_index, current_sg, end - sg_index);
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}
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