dmaengine: remove DMA_SG as it is dead code in kernel

There are no in kernel consumers for DMA_SG op. Removing operation,
dead code, and test code in dmatest.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 0 insertions, 118 deletions

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 3b8b752ede2d..3eaece888e75 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -825,122 +825,6 @@ fail:
 	return NULL;
 }
 
-static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan,
-	struct scatterlist *dst_sg, unsigned int dst_nents,
-	struct scatterlist *src_sg, unsigned int src_nents,
-	unsigned long flags)
-{
-	struct fsl_desc_sw *first = NULL, *prev = NULL, *new = NULL;
-	struct fsldma_chan *chan = to_fsl_chan(dchan);
-	size_t dst_avail, src_avail;
-	dma_addr_t dst, src;
-	size_t len;
-
-	/* basic sanity checks */
-	if (dst_nents == 0 || src_nents == 0)
-		return NULL;
-
-	if (dst_sg == NULL || src_sg == NULL)
-		return NULL;
-
-	/*
-	 * TODO: should we check that both scatterlists have the same
-	 * TODO: number of bytes in total? Is that really an error?
-	 */
-
-	/* get prepared for the loop */
-	dst_avail = sg_dma_len(dst_sg);
-	src_avail = sg_dma_len(src_sg);
-
-	/* run until we are out of scatterlist entries */
-	while (true) {
-
-		/* create the largest transaction possible */
-		len = min_t(size_t, src_avail, dst_avail);
-		len = min_t(size_t, len, FSL_DMA_BCR_MAX_CNT);
-		if (len == 0)
-			goto fetch;
-
-		dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
-		src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
-
-		/* allocate and populate the descriptor */
-		new = fsl_dma_alloc_descriptor(chan);
-		if (!new) {
-			chan_err(chan, "%s\n", msg_ld_oom);
-			goto fail;
-		}
-
-		set_desc_cnt(chan, &new->hw, len);
-		set_desc_src(chan, &new->hw, src);
-		set_desc_dst(chan, &new->hw, dst);
-
-		if (!first)
-			first = new;
-		else
-			set_desc_next(chan, &prev->hw, new->async_tx.phys);
-
-		new->async_tx.cookie = 0;
-		async_tx_ack(&new->async_tx);
-		prev = new;
-
-		/* Insert the link descriptor to the LD ring */
-		list_add_tail(&new->node, &first->tx_list);
-
-		/* update metadata */
-		dst_avail -= len;
-		src_avail -= len;
-
-fetch:
-		/* fetch the next dst scatterlist entry */
-		if (dst_avail == 0) {
-
-			/* no more entries: we're done */
-			if (dst_nents == 0)
-				break;
-
-			/* fetch the next entry: if there are no more: done */
-			dst_sg = sg_next(dst_sg);
-			if (dst_sg == NULL)
-				break;
-
-			dst_nents--;
-			dst_avail = sg_dma_len(dst_sg);
-		}
-
-		/* fetch the next src scatterlist entry */
-		if (src_avail == 0) {
-
-			/* no more entries: we're done */
-			if (src_nents == 0)
-				break;
-
-			/* fetch the next entry: if there are no more: done */
-			src_sg = sg_next(src_sg);
-			if (src_sg == NULL)
-				break;
-
-			src_nents--;
-			src_avail = sg_dma_len(src_sg);
-		}
-	}
-
-	new->async_tx.flags = flags; /* client is in control of this ack */
-	new->async_tx.cookie = -EBUSY;
-
-	/* Set End-of-link to the last link descriptor of new list */
-	set_ld_eol(chan, new);
-
-	return &first->async_tx;
-
-fail:
-	if (!first)
-		return NULL;
-
-	fsldma_free_desc_list_reverse(chan, &first->tx_list);
-	return NULL;
-}
-
 static int fsl_dma_device_terminate_all(struct dma_chan *dchan)
 {
 	struct fsldma_chan *chan;
@@ -1357,12 +1241,10 @@ static int fsldma_of_probe(struct platform_device *op)
 	fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0);
 
 	dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask);
-	dma_cap_set(DMA_SG, fdev->common.cap_mask);
 	dma_cap_set(DMA_SLAVE, fdev->common.cap_mask);
 	fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources;
 	fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources;
 	fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy;
-	fdev->common.device_prep_dma_sg = fsl_dma_prep_sg;
 	fdev->common.device_tx_status = fsl_tx_status;
 	fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
 	fdev->common.device_config = fsl_dma_device_config;