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, 0 insertions, 36 deletions

diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index 1d0c98839087..4506a7b4f972 100644
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -154,38 +154,6 @@ static bool __td_dma_done_ack(struct timb_dma_chan *td_chan)
         return done;
 }
 
-static void __td_unmap_desc(struct timb_dma_chan *td_chan, const u8 *dma_desc,
-        bool single)
-{
-        dma_addr_t addr;
-        int len;
-
-        addr = (dma_desc[7] << 24) | (dma_desc[6] << 16) | (dma_desc[5] << 8) |
-                dma_desc[4];
-
-        len = (dma_desc[3] << 8) | dma_desc[2];
-
-        if (single)
-                dma_unmap_single(chan2dev(&td_chan->chan), addr, len,
-                        DMA_TO_DEVICE);
-        else
-                dma_unmap_page(chan2dev(&td_chan->chan), addr, len,
-                        DMA_TO_DEVICE);
-}
-
-static void __td_unmap_descs(struct timb_dma_desc *td_desc, bool single)
-{
-        struct timb_dma_chan *td_chan = container_of(td_desc->txd.chan,
-                struct timb_dma_chan, chan);
-        u8 *descs;
-
-        for (descs = td_desc->desc_list; ; descs += TIMB_DMA_DESC_SIZE) {
-                __td_unmap_desc(td_chan, descs, single);
-                if (descs[0] & 0x02)
-                        break;
-        }
-}
-
 static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc,
         struct scatterlist *sg, bool last)
 {
@@ -294,10 +262,6 @@ static void __td_finish(struct timb_dma_chan *td_chan)
         list_move(&td_desc->desc_node, &td_chan->free_list);
 
         dma_descriptor_unmap(txd);
-        if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP))
-                __td_unmap_descs(td_desc,
-                        txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE);
-
         /*
          * The API requires that no submissions are done from a
          * callback, so we don't need to drop the lock here