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path: root/drivers/crypto/caam/sg_sw_sec4.h
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Diffstat (limited to 'drivers/crypto/caam/sg_sw_sec4.h')
-rw-r--r--drivers/crypto/caam/sg_sw_sec4.h156
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h
new file mode 100644
index 0000000..e0037c8
--- /dev/null
+++ b/drivers/crypto/caam/sg_sw_sec4.h
@@ -0,0 +1,156 @@
+/*
+ * 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->reserved = 0;
+ 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 = scatterwalk_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;
+}
+
+/* count number of elements in scatterlist */
+static inline int __sg_count(struct scatterlist *sg_list, int nbytes,
+ bool *chained)
+{
+ 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)
+ *chained = true;
+ 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,
+ bool *chained)
+{
+ int sg_nents = __sg_count(sg_list, nbytes, chained);
+
+ if (likely(sg_nents == 1))
+ return 0;
+
+ return sg_nents;
+}
+
+static int dma_map_sg_chained(struct device *dev, struct scatterlist *sg,
+ unsigned int nents, enum dma_data_direction dir,
+ bool chained)
+{
+ if (unlikely(chained)) {
+ int i;
+ for (i = 0; i < nents; i++) {
+ dma_map_sg(dev, sg, 1, dir);
+ sg = scatterwalk_sg_next(sg);
+ }
+ } else {
+ dma_map_sg(dev, sg, nents, dir);
+ }
+ return nents;
+}
+
+static int dma_unmap_sg_chained(struct device *dev, struct scatterlist *sg,
+ unsigned int nents, enum dma_data_direction dir,
+ bool chained)
+{
+ if (unlikely(chained)) {
+ int i;
+ for (i = 0; i < nents; i++) {
+ dma_unmap_sg(dev, sg, 1, dir);
+ sg = scatterwalk_sg_next(sg);
+ }
+ } else {
+ dma_unmap_sg(dev, sg, nents, dir);
+ }
+ return nents;
+}
+
+/* Copy from len bytes of sg to dest, starting from beginning */
+static inline void sg_copy(u8 *dest, struct scatterlist *sg, unsigned int len)
+{
+ struct scatterlist *current_sg = sg;
+ int cpy_index = 0, next_cpy_index = current_sg->length;
+
+ while (next_cpy_index < len) {
+ memcpy(dest + cpy_index, (u8 *) sg_virt(current_sg),
+ current_sg->length);
+ current_sg = scatterwalk_sg_next(current_sg);
+ cpy_index = next_cpy_index;
+ next_cpy_index += current_sg->length;
+ }
+ if (cpy_index < len)
+ memcpy(dest + cpy_index, (u8 *) sg_virt(current_sg),
+ len - cpy_index);
+}
+
+/* Copy sg data, from to_skip to end, to dest */
+static inline void sg_copy_part(u8 *dest, struct scatterlist *sg,
+ int to_skip, unsigned int end)
+{
+ struct scatterlist *current_sg = sg;
+ int sg_index, cpy_index;
+
+ sg_index = current_sg->length;
+ while (sg_index <= to_skip) {
+ current_sg = scatterwalk_sg_next(current_sg);
+ sg_index += current_sg->length;
+ }
+ cpy_index = sg_index - to_skip;
+ memcpy(dest, (u8 *) sg_virt(current_sg) +
+ current_sg->length - cpy_index, cpy_index);
+ current_sg = scatterwalk_sg_next(current_sg);
+ if (end - sg_index)
+ sg_copy(dest + cpy_index, current_sg, end - sg_index);
+}
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