dmaengine: altera: remove DMA_SG

Commit c678fa6: ("dmaengine: remove DMA_SG as it is dead code in
kernel") removes DMA_SG from dmaengine subsystem but missed the newly added
driver, so remove it from here as well

Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

Author: Vinod Koul

drivers/dma/altera-msgdma.c

@@ -385,98 +385,6 @@ msgdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
 	return &first->async_tx;
 }
 
-/**
- * msgdma_prep_sg - prepare descriptors for a memory sg transaction
- * @dchan: DMA channel
- * @dst_sg: Destination scatter list
- * @dst_sg_len: Number of entries in destination scatter list
- * @src_sg: Source scatter list
- * @src_sg_len: Number of entries in source scatter list
- * @flags: transfer ack flags
- *
- * Return: Async transaction descriptor on success and NULL on failure
- */
-static struct dma_async_tx_descriptor *
-msgdma_prep_sg(struct dma_chan *dchan, struct scatterlist *dst_sg,
-	       unsigned int dst_sg_len, struct scatterlist *src_sg,
-	       unsigned int src_sg_len, unsigned long flags)
-{
-	struct msgdma_device *mdev = to_mdev(dchan);
-	struct msgdma_sw_desc *new, *first = NULL;
-	void *desc = NULL;
-	size_t len, dst_avail, src_avail;
-	dma_addr_t dma_dst, dma_src;
-	u32 desc_cnt = 0, i;
-	struct scatterlist *sg;
-
-	for_each_sg(src_sg, sg, src_sg_len, i)
-		desc_cnt += DIV_ROUND_UP(sg_dma_len(sg), MSGDMA_MAX_TRANS_LEN);
-
-	spin_lock_bh(&mdev->lock);
-	if (desc_cnt > mdev->desc_free_cnt) {
-		spin_unlock_bh(&mdev->lock);
-		dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);
-		return NULL;
-	}
-	mdev->desc_free_cnt -= desc_cnt;
-	spin_unlock_bh(&mdev->lock);
-
-	dst_avail = sg_dma_len(dst_sg);
-	src_avail = sg_dma_len(src_sg);
-
-	/* Run until we are out of scatterlist entries */
-	while (true) {
-		/* Allocate and populate the descriptor */
-		new = msgdma_get_descriptor(mdev);
-
-		desc = &new->hw_desc;
-		len = min_t(size_t, src_avail, dst_avail);
-		len = min_t(size_t, len, MSGDMA_MAX_TRANS_LEN);
-		if (len == 0)
-			goto fetch;
-		dma_dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) -
-			dst_avail;
-		dma_src = sg_dma_address(src_sg) + sg_dma_len(src_sg) -
-			src_avail;
-
-		msgdma_desc_config(desc, dma_dst, dma_src, len,
-				   MSGDMA_DESC_STRIDE_RW);
-		dst_avail -= len;
-		src_avail -= len;
-
-		if (!first)
-			first = new;
-		else
-			list_add_tail(&new->node, &first->tx_list);
-fetch:
-		/* Fetch the next dst scatterlist entry */
-		if (dst_avail == 0) {
-			if (dst_sg_len == 0)
-				break;
-			dst_sg = sg_next(dst_sg);
-			if (dst_sg == NULL)
-				break;
-			dst_sg_len--;
-			dst_avail = sg_dma_len(dst_sg);
-		}
-		/* Fetch the next src scatterlist entry */
-		if (src_avail == 0) {
-			if (src_sg_len == 0)
-				break;
-			src_sg = sg_next(src_sg);
-			if (src_sg == NULL)
-				break;
-			src_sg_len--;
-			src_avail = sg_dma_len(src_sg);
-		}
-	}
-
-	msgdma_desc_config_eod(desc);
-	first->async_tx.flags = flags;
-
-	return &first->async_tx;
-}
-
 /**
  * msgdma_prep_slave_sg - prepare descriptors for a slave sg transaction
  *
@@ -943,7 +851,6 @@ static int msgdma_probe(struct platform_device *pdev)
 	/* Set DMA capabilities */
 	dma_cap_zero(dma_dev->cap_mask);
 	dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
-	dma_cap_set(DMA_SG, dma_dev->cap_mask);
 	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
 
 	dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
@@ -962,7 +869,6 @@ static int msgdma_probe(struct platform_device *pdev)
 
 	dma_dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
 	dma_dev->device_prep_dma_memcpy = msgdma_prep_memcpy;
-	dma_dev->device_prep_dma_sg = msgdma_prep_sg;
 	dma_dev->device_prep_slave_sg = msgdma_prep_slave_sg;
 	dma_dev->device_config = msgdma_dma_config;