diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index ac80bc6af093..2e9435577cea 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -112,6 +112,8 @@
 #define FLAGS_BE32_SHA1		8
 #define FLAGS_SGS_COPIED	9
 #define FLAGS_SGS_ALLOCED	10
+#define FLAGS_HUGE		11
+
 /* context flags */
 #define FLAGS_FINUP		16
 
@@ -136,6 +138,8 @@
 #define BUFLEN			SHA512_BLOCK_SIZE
 #define OMAP_SHA_DMA_THRESHOLD	256
 
+#define OMAP_SHA_MAX_DMA_LEN	(1024 * 2048)
+
 struct omap_sham_dev;
 
 struct omap_sham_reqctx {
@@ -689,21 +693,20 @@ static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx,
 
 	set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags);
 
+	ctx->offset += new_len - ctx->bufcnt;
 	ctx->bufcnt = 0;
 
 	return 0;
 }
 
 static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
-			      struct scatterlist *sg, int bs, int new_len)
+			      struct scatterlist *sg, int bs,
+			      unsigned int new_len)
 {
 	int pages;
 	void *buf;
-	int len;
-
-	len = new_len + ctx->bufcnt;
 
-	pages = get_order(ctx->total);
+	pages = get_order(new_len);
 
 	buf = (void *)__get_free_pages(GFP_ATOMIC, pages);
 	if (!buf) {
@@ -715,14 +718,14 @@ static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx,
 		memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
 
 	scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset,
-				 ctx->total - ctx->bufcnt, 0);
+				 min(new_len, ctx->total) - ctx->bufcnt, 0);
 	sg_init_table(ctx->sgl, 1);
-	sg_set_buf(ctx->sgl, buf, len);
+	sg_set_buf(ctx->sgl, buf, new_len);
 	ctx->sg = ctx->sgl;
 	set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags);
 	ctx->sg_len = 1;
+	ctx->offset += new_len - ctx->bufcnt;
 	ctx->bufcnt = 0;
-	ctx->offset = 0;
 
 	return 0;
 }
@@ -741,7 +744,7 @@ static int omap_sham_align_sgs(struct scatterlist *sg,
 	if (!sg || !sg->length || !nbytes)
 		return 0;
 
-	new_len = nbytes;
+	new_len = nbytes - offset;
 
 	if (offset)
 		list_ok = false;
@@ -751,6 +754,9 @@ static int omap_sham_align_sgs(struct scatterlist *sg,
 	else
 		new_len = (new_len - 1) / bs * bs;
 
+	if (!new_len)
+		return 0;
+
 	if (nbytes != new_len)
 		list_ok = false;
 
@@ -794,10 +800,17 @@ static int omap_sham_align_sgs(struct scatterlist *sg,
 		}
 	}
 
+	if (new_len > OMAP_SHA_MAX_DMA_LEN) {
+		new_len = OMAP_SHA_MAX_DMA_LEN;
+		aligned = false;
+	}
+
 	if (!aligned)
 		return omap_sham_copy_sgs(rctx, sg, bs, new_len);
 	else if (!list_ok)
 		return omap_sham_copy_sg_lists(rctx, sg, bs, new_len);
+	else
+		rctx->offset += new_len;
 
 	rctx->sg_len = n;
 	rctx->sg = sg;
@@ -821,7 +834,12 @@ static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 	else
 		nbytes = 0;
 
-	rctx->total = nbytes + rctx->bufcnt;
+	rctx->total = nbytes + rctx->bufcnt - rctx->offset;
+
+	dev_dbg(rctx->dd->dev,
+		"%s: nbytes=%d, bs=%d, total=%d, offset=%d, bufcnt=%d\n",
+		__func__, nbytes, bs, rctx->total, rctx->offset,
+		rctx->bufcnt);
 
 	if (!rctx->total)
 		return 0;
@@ -847,12 +865,15 @@ static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 
 	xmit_len = rctx->total;
 
+	if (xmit_len > OMAP_SHA_MAX_DMA_LEN)
+		xmit_len = OMAP_SHA_MAX_DMA_LEN;
+
 	if (!IS_ALIGNED(xmit_len, bs)) {
 		if (final)
 			xmit_len = DIV_ROUND_UP(xmit_len, bs) * bs;
 		else
 			xmit_len = xmit_len / bs * bs;
-	} else if (!final) {
+	} else if (!final && rctx->total == xmit_len) {
 		xmit_len -= bs;
 	}
 
@@ -880,7 +901,7 @@ static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 		rctx->sg_len = 1;
 	}
 
-	if (hash_later) {
+	if (hash_later && hash_later <= rctx->buflen) {
 		int offset = 0;
 
 		if (hash_later > req->nbytes) {
@@ -901,6 +922,9 @@ static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 		rctx->bufcnt = 0;
 	}
 
+	if (hash_later > rctx->buflen)
+		set_bit(FLAGS_HUGE, &rctx->dd->flags);
+
 	if (!final)
 		rctx->total = xmit_len;
 
@@ -998,10 +1022,11 @@ static int omap_sham_update_req(struct omap_sham_dev *dd)
 	struct ahash_request *req = dd->req;
 	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 	int err;
-	bool final = ctx->flags & BIT(FLAGS_FINUP);
+	bool final = (ctx->flags & BIT(FLAGS_FINUP)) &&
+			!(dd->flags & BIT(FLAGS_HUGE));
 
-	dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
-		 ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
+	dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, final: %d",
+		ctx->total, ctx->digcnt, final);
 
 	if (ctx->total < get_block_size(ctx) ||
 	    ctx->total < dd->fallback_sz)
@@ -1024,6 +1049,9 @@ static int omap_sham_final_req(struct omap_sham_dev *dd)
 	struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
 	int err = 0, use_dma = 1;
 
+	if (dd->flags & BIT(FLAGS_HUGE))
+		return 0;
+
 	if ((ctx->total <= get_block_size(ctx)) || dd->polling_mode)
 		/*
 		 * faster to handle last block with cpu or
@@ -1083,7 +1111,7 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
 
 	if (test_bit(FLAGS_SGS_COPIED, &dd->flags))
 		free_pages((unsigned long)sg_virt(ctx->sg),
-			   get_order(ctx->sg->length + ctx->bufcnt));
+			   get_order(ctx->sg->length));
 
 	if (test_bit(FLAGS_SGS_ALLOCED, &dd->flags))
 		kfree(ctx->sg);
@@ -1092,6 +1120,21 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
 
 	dd->flags &= ~(BIT(FLAGS_SGS_ALLOCED) | BIT(FLAGS_SGS_COPIED));
 
+	if (dd->flags & BIT(FLAGS_HUGE)) {
+		dd->flags &= ~(BIT(FLAGS_CPU) | BIT(FLAGS_DMA_READY) |
+				BIT(FLAGS_OUTPUT_READY) | BIT(FLAGS_HUGE));
+		omap_sham_prepare_request(req, ctx->op == OP_UPDATE);
+		if (ctx->op == OP_UPDATE || (dd->flags & BIT(FLAGS_HUGE))) {
+			err = omap_sham_update_req(dd);
+			if (err != -EINPROGRESS &&
+			    (ctx->flags & BIT(FLAGS_FINUP)))
+				err = omap_sham_final_req(dd);
+		} else if (ctx->op == OP_FINAL) {
+			omap_sham_final_req(dd);
+		}
+		return;
+	}
+
 	if (!err) {
 		dd->pdata->copy_hash(req, 1);
 		if (test_bit(FLAGS_FINAL, &dd->flags))
@@ -1107,6 +1150,8 @@ static void omap_sham_finish_req(struct ahash_request *req, int err)
 	pm_runtime_mark_last_busy(dd->dev);
 	pm_runtime_put_autosuspend(dd->dev);
 
+	ctx->offset = 0;
+
 	if (req->base.complete)
 		req->base.complete(&req->base, err);
 }
@@ -1158,7 +1203,7 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd,
 		/* request has changed - restore hash */
 		dd->pdata->copy_hash(req, 0);
 
-	if (ctx->op == OP_UPDATE) {
+	if (ctx->op == OP_UPDATE || (dd->flags & BIT(FLAGS_HUGE))) {
 		err = omap_sham_update_req(dd);
 		if (err != -EINPROGRESS && (ctx->flags & BIT(FLAGS_FINUP)))
 			/* no final() after finup() */
@@ -1730,6 +1775,8 @@ static void omap_sham_done_task(unsigned long data)
 	struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
 	int err = 0;
 
+	dev_dbg(dd->dev, "%s: flags=%lx\n", __func__, dd->flags);
+
 	if (!test_bit(FLAGS_BUSY, &dd->flags)) {
 		omap_sham_handle_queue(dd, NULL);
 		return;
