dma40: implement prep_memcpy as a wrapper around memcpy_sg

To simplify the code.

Acked-by: Per Forlin <per.forlin@stericsson.com>
Acked-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dma/ste_dma40.c

@@ -1863,108 +1863,19 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
 						       size_t size,
 						       unsigned long dma_flags)
 {
-	struct d40_desc *d40d;
-	struct d40_chan *d40c = container_of(chan, struct d40_chan,
-					     chan);
-	unsigned long flags;
+	struct scatterlist dst_sg;
+	struct scatterlist src_sg;
 
-	if (d40c->phy_chan == NULL) {
-		chan_err(d40c, "Channel is not allocated.\n");
-		return ERR_PTR(-EINVAL);
-	}
+	sg_init_table(&dst_sg, 1);
+	sg_init_table(&src_sg, 1);
 
-	spin_lock_irqsave(&d40c->lock, flags);
-	d40d = d40_desc_get(d40c);
+	sg_dma_address(&dst_sg) = dst;
+	sg_dma_address(&src_sg) = src;
 
-	if (d40d == NULL) {
-		chan_err(d40c, "Descriptor is NULL\n");
-		goto err;
-	}
+	sg_dma_len(&dst_sg) = size;
+	sg_dma_len(&src_sg) = size;
 
-	d40d->txd.flags = dma_flags;
-	d40d->lli_len = d40_size_2_dmalen(size,
-					  d40c->dma_cfg.src_info.data_width,
-					  d40c->dma_cfg.dst_info.data_width);
-	if (d40d->lli_len < 0) {
-		chan_err(d40c, "Unaligned size\n");
-		goto err;
-	}
-
-
-	dma_async_tx_descriptor_init(&d40d->txd, chan);
-
-	d40d->txd.tx_submit = d40_tx_submit;
-
-	if (chan_is_logical(d40c)) {
-
-		if (d40_pool_lli_alloc(d40c,d40d, d40d->lli_len, true) < 0) {
-			chan_err(d40c, "Out of memory\n");
-			goto err;
-		}
-		d40d->lli_current = 0;
-
-		if (d40_log_buf_to_lli(d40d->lli_log.src,
-				       src,
-				       size,
-				       d40c->log_def.lcsp1,
-				       d40c->dma_cfg.src_info.data_width,
-				       d40c->dma_cfg.dst_info.data_width,
-				       true) == NULL)
-			goto err;
-
-		if (d40_log_buf_to_lli(d40d->lli_log.dst,
-				       dst,
-				       size,
-				       d40c->log_def.lcsp3,
-				       d40c->dma_cfg.dst_info.data_width,
-				       d40c->dma_cfg.src_info.data_width,
-				       true) == NULL)
-			goto err;
-
-	} else {
-
-		if (d40_pool_lli_alloc(d40c, d40d, d40d->lli_len, false) < 0) {
-			chan_err(d40c, "Out of memory\n");
-			goto err;
-		}
-
-		if (d40_phy_buf_to_lli(d40d->lli_phy.src,
-				       src,
-				       size,
-				       d40c->dma_cfg.src_info.psize,
-				       0,
-				       d40c->src_def_cfg,
-				       true,
-				       d40c->dma_cfg.src_info.data_width,
-				       d40c->dma_cfg.dst_info.data_width,
-				       false) == NULL)
-			goto err;
-
-		if (d40_phy_buf_to_lli(d40d->lli_phy.dst,
-				       dst,
-				       size,
-				       d40c->dma_cfg.dst_info.psize,
-				       0,
-				       d40c->dst_def_cfg,
-				       true,
-				       d40c->dma_cfg.dst_info.data_width,
-				       d40c->dma_cfg.src_info.data_width,
-				       false) == NULL)
-			goto err;
-
-		dma_sync_single_for_device(d40c->base->dev,
-					   d40d->lli_pool.dma_addr,
-					   d40d->lli_pool.size, DMA_TO_DEVICE);
-	}
-
-	spin_unlock_irqrestore(&d40c->lock, flags);
-	return &d40d->txd;
-
-err:
-	if (d40d)
-		d40_desc_free(d40c, d40d);
-	spin_unlock_irqrestore(&d40c->lock, flags);
-	return NULL;
+	return stedma40_memcpy_sg(chan, &dst_sg, &src_sg, 1, dma_flags);
 }
 
 static struct dma_async_tx_descriptor *