dmaengine: remove DMA unmap from drivers

Remove support for DMA unmapping from drivers as it is no longer
needed (DMA core code is now handling it).

Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[djbw: fix up chan2parent() unused warning in drivers/dma/dw/core.c]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 94 deletions

diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index 8f6e426590eb..173e26ff18f8 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -61,80 +61,6 @@ static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
 	}
 }
 
-static void
-iop_desc_unmap(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc)
-{
-	struct dma_async_tx_descriptor *tx = &desc->async_tx;
-	struct iop_adma_desc_slot *unmap = desc->group_head;
-	struct device *dev = &iop_chan->device->pdev->dev;
-	u32 len = unmap->unmap_len;
-	enum dma_ctrl_flags flags = tx->flags;
-	u32 src_cnt;
-	dma_addr_t addr;
-	dma_addr_t dest;
-
-	src_cnt = unmap->unmap_src_cnt;
-	dest = iop_desc_get_dest_addr(unmap, iop_chan);
-	if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
-		enum dma_data_direction dir;
-
-		if (src_cnt > 1) /* is xor? */
-			dir = DMA_BIDIRECTIONAL;
-		else
-			dir = DMA_FROM_DEVICE;
-
-		dma_unmap_page(dev, dest, len, dir);
-	}
-
-	if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
-		while (src_cnt--) {
-			addr = iop_desc_get_src_addr(unmap, iop_chan, src_cnt);
-			if (addr == dest)
-				continue;
-			dma_unmap_page(dev, addr, len, DMA_TO_DEVICE);
-		}
-	}
-	desc->group_head = NULL;
-}
-
-static void
-iop_desc_unmap_pq(struct iop_adma_chan *iop_chan, struct iop_adma_desc_slot *desc)
-{
-	struct dma_async_tx_descriptor *tx = &desc->async_tx;
-	struct iop_adma_desc_slot *unmap = desc->group_head;
-	struct device *dev = &iop_chan->device->pdev->dev;
-	u32 len = unmap->unmap_len;
-	enum dma_ctrl_flags flags = tx->flags;
-	u32 src_cnt = unmap->unmap_src_cnt;
-	dma_addr_t pdest = iop_desc_get_dest_addr(unmap, iop_chan);
-	dma_addr_t qdest = iop_desc_get_qdest_addr(unmap, iop_chan);
-	int i;
-
-	if (tx->flags & DMA_PREP_CONTINUE)
-		src_cnt -= 3;
-
-	if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP) && !desc->pq_check_result) {
-		dma_unmap_page(dev, pdest, len, DMA_BIDIRECTIONAL);
-		dma_unmap_page(dev, qdest, len, DMA_BIDIRECTIONAL);
-	}
-
-	if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
-		dma_addr_t addr;
-
-		for (i = 0; i < src_cnt; i++) {
-			addr = iop_desc_get_src_addr(unmap, iop_chan, i);
-			dma_unmap_page(dev, addr, len, DMA_TO_DEVICE);
-		}
-		if (desc->pq_check_result) {
-			dma_unmap_page(dev, pdest, len, DMA_TO_DEVICE);
-			dma_unmap_page(dev, qdest, len, DMA_TO_DEVICE);
-		}
-	}
-
-	desc->group_head = NULL;
-}
-
-
 static dma_cookie_t
 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
 	struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
@@ -153,15 +79,8 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
 			tx->callback(tx->callback_param);
 
 		dma_descriptor_unmap(tx);
-		/* unmap dma addresses
-		 * (unmap_single vs unmap_page?)
-		 */
-		if (desc->group_head && desc->unmap_len) {
-			if (iop_desc_is_pq(desc))
-				iop_desc_unmap_pq(iop_chan, desc);
-			else
-				iop_desc_unmap(iop_chan, desc);
-		}
+		if (desc->group_head)
+			desc->group_head = NULL;
 	}
 
 	/* run dependent operations */
@@ -592,7 +511,6 @@ iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
 	if (sw_desc) {
 		grp_start = sw_desc->group_head;
 		iop_desc_init_interrupt(grp_start, iop_chan);
-		grp_start->unmap_len = 0;
 		sw_desc->async_tx.flags = flags;
 	}
 	spin_unlock_bh(&iop_chan->lock);
@@ -624,8 +542,6 @@ iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
 		iop_desc_set_byte_count(grp_start, iop_chan, len);
 		iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 		iop_desc_set_memcpy_src_addr(grp_start, dma_src);
-		sw_desc->unmap_src_cnt = 1;
-		sw_desc->unmap_len = len;
 		sw_desc->async_tx.flags = flags;
 	}
 	spin_unlock_bh(&iop_chan->lock);
@@ -658,8 +574,6 @@ iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
 		iop_desc_init_xor(grp_start, src_cnt, flags);
 		iop_desc_set_byte_count(grp_start, iop_chan, len);
 		iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
-		sw_desc->unmap_src_cnt = src_cnt;
-		sw_desc->unmap_len = len;
 		sw_desc->async_tx.flags = flags;
 		while (src_cnt--)
 			iop_desc_set_xor_src_addr(grp_start, src_cnt,
@@ -695,8 +609,6 @@ iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
 		grp_start->xor_check_result = result;
 		pr_debug("\t%s: grp_start->xor_check_result: %p\n",
 			__func__, grp_start->xor_check_result);
-		sw_desc->unmap_src_cnt = src_cnt;
-		sw_desc->unmap_len = len;
 		sw_desc->async_tx.flags = flags;
 		while (src_cnt--)
 			iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
@@ -749,8 +661,6 @@ iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
 			dst[0] = dst[1] & 0x7;
 
 		iop_desc_set_pq_addr(g, dst);
-		sw_desc->unmap_src_cnt = src_cnt;
-		sw_desc->unmap_len = len;
 		sw_desc->async_tx.flags = flags;
 		for (i = 0; i < src_cnt; i++)
 			iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
@@ -805,8 +715,6 @@ iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
 		g->pq_check_result = pqres;
 		pr_debug("\t%s: g->pq_check_result: %p\n",
 			__func__, g->pq_check_result);
-		sw_desc->unmap_src_cnt = src_cnt+2;
-		sw_desc->unmap_len = len;
 		sw_desc->async_tx.flags = flags;
 		while (src_cnt--)
 			iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,