[PATCH] crypto: atmel-tdes - consolidate transfer setup

[Thorsten Blum <blum@kernel.org>]

atmel_tdes_crypt_pdc() and atmel_tdes_crypt_dma() store the transfer
length in dd->dma_size and synchronize the bounce buffers before a slow
transfer.

Move the shared code to atmel_tdes_crypt_start() and use dd->dma_size in
atmel_tdes_crypt_pdc() and atmel_tdes_crypt_dma() instead of passing the
length separately.

Signed-off-by: Thorsten Blum <blum@kernel.org>
---
 drivers/crypto/atmel-tdes.c | 40 ++++++++++++-------------------------
 1 file changed, 13 insertions(+), 27 deletions(-)

diff --git a/drivers/crypto/atmel-tdes.c b/drivers/crypto/atmel-tdes.c
index 53150f9b169b..f084fda42423 100644
--- a/drivers/crypto/atmel-tdes.c
+++ b/drivers/crypto/atmel-tdes.c
@@ -349,20 +349,9 @@ static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
 
 static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
 				dma_addr_t dma_addr_in,
-				dma_addr_t dma_addr_out, int length)
+				dma_addr_t dma_addr_out)
 {
-	int len32;
-
-	dd->dma_size = length;
-
-	if (!(dd->flags & TDES_FLAGS_FAST)) {
-		dma_sync_single_for_device(dd->dev, dma_addr_in, length,
-					   DMA_TO_DEVICE);
-		dma_sync_single_for_device(dd->dev, dma_addr_out, length,
-					   DMA_FROM_DEVICE);
-	}
-
-	len32 = DIV_ROUND_UP(length, sizeof(u32));
+	u32 len32 = DIV_ROUND_UP(dd->dma_size, sizeof(u32));
 
 	atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
 	atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
@@ -381,21 +370,12 @@ static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
 
 static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
 				dma_addr_t dma_addr_in,
-				dma_addr_t dma_addr_out, int length)
+				dma_addr_t dma_addr_out)
 {
 	struct scatterlist sg[2];
 	struct dma_async_tx_descriptor	*in_desc, *out_desc;
 	enum dma_slave_buswidth addr_width;
 
-	dd->dma_size = length;
-
-	if (!(dd->flags & TDES_FLAGS_FAST)) {
-		dma_sync_single_for_device(dd->dev, dma_addr_in, length,
-					   DMA_TO_DEVICE);
-		dma_sync_single_for_device(dd->dev, dma_addr_out, length,
-					   DMA_FROM_DEVICE);
-	}
-
 	addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 
 	dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
@@ -408,11 +388,11 @@ static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
 
 	sg_init_table(&sg[0], 1);
 	sg_dma_address(&sg[0]) = dma_addr_in;
-	sg_dma_len(&sg[0]) = length;
+	sg_dma_len(&sg[0]) = dd->dma_size;
 
 	sg_init_table(&sg[1], 1);
 	sg_dma_address(&sg[1]) = dma_addr_out;
-	sg_dma_len(&sg[1]) = length;
+	sg_dma_len(&sg[1]) = dd->dma_size;
 
 	in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
 				1, DMA_MEM_TO_DEV,
@@ -486,11 +466,17 @@ static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
 	}
 
 	dd->total -= count;
+	dd->dma_size = count;
+
+	if (!fast) {
+		dma_sync_single_for_device(dd->dev, addr_in, dd->dma_size, DMA_TO_DEVICE);
+		dma_sync_single_for_device(dd->dev, addr_out, dd->dma_size, DMA_FROM_DEVICE);
+	}
 
 	if (dd->caps.has_dma)
-		err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count);
+		err = atmel_tdes_crypt_dma(dd, addr_in, addr_out);
 	else
-		err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count);
+		err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out);
 
 	if (err && (dd->flags & TDES_FLAGS_FAST)) {
 		dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);