ioat: define descriptor control bit-field

This cleans up a mess of and'ing and or'ing bit definitions, and allows
simple assignments from the specified dma_ctrl_flags parameter.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 16 insertions, 12 deletions

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index b7508041c6d7..4840d4805d8c 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -472,9 +472,9 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
                 return -ENOMEM;
         }
 
-        hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+        hw->ctl_f.compl_write = 1;
         if (first->txd.callback) {
-                hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN;
+                hw->ctl_f.int_en = 1;
                 if (first != new) {
                         /* move callback into to last desc */
                         new->txd.callback = first->txd.callback;
@@ -563,9 +563,9 @@ static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
                 return -ENOMEM;
         }
 
-        hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+        hw->ctl_f.compl_write = 1;
         if (first->txd.callback) {
-                hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN;
+                hw->ctl_f.int_en = 1;
                 if (first != new) {
                         /* move callback into to last desc */
                         new->txd.callback = first->txd.callback;
@@ -878,7 +878,8 @@ ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
                 noop_desc = to_ioat_desc(ioat_chan->used_desc.next);
                 /* set size to non-zero value (channel returns error when size is 0) */
                 noop_desc->hw->size = NULL_DESC_BUFFER_SIZE;
-                noop_desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL;
+                noop_desc->hw->ctl = 0;
+                noop_desc->hw->ctl_f.null = 1;
                 noop_desc->hw->src_addr = 0;
                 noop_desc->hw->dst_addr = 0;
 
@@ -1230,6 +1231,7 @@ ioat_dma_is_complete(struct dma_chan *chan, dma_cookie_t cookie,
 static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
 {
         struct ioat_desc_sw *desc;
+        struct ioat_dma_descriptor *hw;
 
         spin_lock_bh(&ioat_chan->desc_lock);
 
@@ -1242,17 +1244,19 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
                 return;
         }
 
-        desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL
-                                | IOAT_DMA_DESCRIPTOR_CTL_INT_GN
-                                | IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+        hw = desc->hw;
+        hw->ctl = 0;
+        hw->ctl_f.null = 1;
+        hw->ctl_f.int_en = 1;
+        hw->ctl_f.compl_write = 1;
         /* set size to non-zero value (channel returns error when size is 0) */
-        desc->hw->size = NULL_DESC_BUFFER_SIZE;
-        desc->hw->src_addr = 0;
-        desc->hw->dst_addr = 0;
+        hw->size = NULL_DESC_BUFFER_SIZE;
+        hw->src_addr = 0;
+        hw->dst_addr = 0;
         async_tx_ack(&desc->txd);
         switch (ioat_chan->device->version) {
         case IOAT_VER_1_2:
-                desc->hw->next = 0;
+                hw->next = 0;
                 list_add_tail(&desc->node, &ioat_chan->used_desc);
 
                 writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,