1 files changed, 90 insertions, 0 deletions

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 68c44253137d..9909f93255b4 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -40,6 +40,8 @@
 #define DST_MAXBURST			4
 #define DMA_MIN				(DST_MAXBURST * sizeof(u32))
 
+#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
+
 /* OMAP TRM gives bitfields as start:end, where start is the higher bit
    number. For example 7:0 */
 #define FLD_MASK(start, end)	(((1 << ((start) - (end) + 1)) - 1) << (end))
@@ -92,6 +94,8 @@
 #define FLAGS_FAST		BIT(5)
 #define FLAGS_BUSY		BIT(6)
 
+#define AES_BLOCK_WORDS		(AES_BLOCK_SIZE >> 2)
+
 struct omap_aes_ctx {
 	struct omap_aes_dev *dd;
 
@@ -157,6 +161,8 @@ struct omap_aes_dev {
 	size_t				total;
 	struct scatterlist		*in_sg;
 	struct scatterlist		*out_sg;
+	struct scatter_walk		in_walk;
+	struct scatter_walk		out_walk;
 	int			dma_in;
 	struct dma_chan		*dma_lch_in;
 	int			dma_out;
@@ -863,6 +869,90 @@ static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
 	.minor_shift	= 0,
 };
 
+static irqreturn_t omap_aes_irq(int irq, void *dev_id)
+{
+	struct omap_aes_dev *dd = dev_id;
+	u32 status, i;
+	u32 *src, *dst;
+
+	status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
+	if (status & AES_REG_IRQ_DATA_IN) {
+		omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
+
+		BUG_ON(!dd->in_sg);
+
+		BUG_ON(_calc_walked(in) > dd->in_sg->length);
+
+		src = sg_virt(dd->in_sg) + _calc_walked(in);
+
+		for (i = 0; i < AES_BLOCK_WORDS; i++) {
+			omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
+
+			scatterwalk_advance(&dd->in_walk, 4);
+			if (dd->in_sg->length == _calc_walked(in)) {
+				dd->in_sg = scatterwalk_sg_next(dd->in_sg);
+				if (dd->in_sg) {
+					scatterwalk_start(&dd->in_walk,
+							  dd->in_sg);
+					src = sg_virt(dd->in_sg) +
+					      _calc_walked(in);
+				}
+			} else {
+				src++;
+			}
+		}
+
+		/* Clear IRQ status */
+		status &= ~AES_REG_IRQ_DATA_IN;
+		omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
+
+		/* Enable DATA_OUT interrupt */
+		omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
+
+	} else if (status & AES_REG_IRQ_DATA_OUT) {
+		omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
+
+		BUG_ON(!dd->out_sg);
+
+		BUG_ON(_calc_walked(out) > dd->out_sg->length);
+
+		dst = sg_virt(dd->out_sg) + _calc_walked(out);
+
+		for (i = 0; i < AES_BLOCK_WORDS; i++) {
+			*dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
+			scatterwalk_advance(&dd->out_walk, 4);
+			if (dd->out_sg->length == _calc_walked(out)) {
+				dd->out_sg = scatterwalk_sg_next(dd->out_sg);
+				if (dd->out_sg) {
+					scatterwalk_start(&dd->out_walk,
+							  dd->out_sg);
+					dst = sg_virt(dd->out_sg) +
+					      _calc_walked(out);
+				}
+			} else {
+				dst++;
+			}
+		}
+
+		dd->total -= AES_BLOCK_SIZE;
+
+		BUG_ON(dd->total < 0);
+
+		/* Clear IRQ status */
+		status &= ~AES_REG_IRQ_DATA_OUT;
+		omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
+
+		if (!dd->total)
+			/* All bytes read! */
+			tasklet_schedule(&dd->done_task);
+		else
+			/* Enable DATA_IN interrupt for next block */
+			omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
+	}
+
+	return IRQ_HANDLED;
+}
+
 static const struct of_device_id omap_aes_of_match[] = {
 	{
 		.compatible	= "ti,omap2-aes",