Need a cancel method to stop DMA

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2280 42af7a65-404d-4744-a932-0658087f49c3

drivers/mmcsd/mmcsd_sdio.c

@@ -459,6 +459,7 @@ static int mmcsd_getSCR(FAR struct mmcsd_state_s *priv, uint32 scr[2])
   if (ret != OK)
     {
       fdbg("ERROR: RECVR1 for ACMD51 failed: %d\n", ret);
+      SDIO_CANCEL(priv->dev);
       return ret;
     }
 
@@ -1254,6 +1255,7 @@ static ssize_t mmcsd_readsingle(FAR struct mmcsd_state_s *priv,
   if (ret != OK)
     {
       fdbg("ERROR: mmcsd_recvR1 for CMD17 failed: %d\n", ret);
+      SDIO_CANCEL(priv->dev);
       return ret;
     }
 
@@ -1359,6 +1361,7 @@ static ssize_t mmcsd_readmultiple(FAR struct mmcsd_state_s *priv,
   if (ret != OK)
     {
       fdbg("ERROR: mmcsd_recvR1 for CMD18 failed: %d\n", ret);
+      SDIO_CANCEL(priv->dev);
       return ret;
     }
 

include/nuttx/sdio.h

@@ -444,6 +444,25 @@
 
 #define SDIO_SENDSETUP(dev,buffer,nbytes) ((dev)->sendsetup(dev,buffer,nbytes))
 
+/****************************************************************************
+ * Name: SDIO_CANCEL
+ *
+ * Description:
+ *   Cancel the data transfer setup of SDIO_RECVSETUP, SDIO_SENDSETUP,
+ *   SDIO_DMARECVSETUP or SDIO_DMASENDSETUP.  This must be called to cancel
+ *   the data transfer setup if, for some reason, you cannot perform the
+ *   transfer.
+ *
+ * Input Parameters:
+ *   dev  - An instance of the SDIO device interface
+ *
+ * Returned Value:
+ *   OK is success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+#define SDIO_CANCEL(dev) ((dev)->cancel(dev))
+
 /****************************************************************************
  * Name: SDIO_WAITRESPONSE
  *
@@ -708,6 +727,7 @@ struct sdio_dev_s
           size_t nbytes);
   int   (*sendsetup)(FAR struct sdio_dev_s *dev, FAR const ubyte *buffer,
           size_t nbytes);
+  int   (*cancel)(FAR struct sdio_dev_s *dev);
 
   int   (*waitresponse)(FAR struct sdio_dev_s *dev, uint32 cmd);
   int   (*recvR1)(FAR struct sdio_dev_s *dev, uint32 cmd, uint32 *R1);