STM32 SPI DMA: Fix related to CONFIG_STM32_DMACAPABLE from Ken Pettit

ChangeLog

@@ -5894,4 +5894,6 @@
 	  VS1053 driver from ken Pettit (2013-10-27).
 	* configs/mikroe-stm32f4/: Updated configuration for the
 	  Mikrow STM32F4 board from Ken Pettit (2013-10-27).
+	* arch/arm/src/stm32/stm32_spi.c:  DMA-related fixe from Ken
+	  Pettit (2013-10-27).
 

arch/arm/src/stm32/stm32_spi.c

@@ -195,6 +195,8 @@ struct stm32_spidev_s
   DMA_HANDLE       txdma;      /* DMA channel handle for TX transfers */
   sem_t            rxsem;      /* Wait for RX DMA to complete */
   sem_t            txsem;      /* Wait for TX DMA to complete */
+  uint32_t         txccr;      /* DMA control register for TX transfers */
+  uint32_t         rxccr;      /* DMA control register for RX transfers */
 #endif
 #ifndef CONFIG_SPI_OWNBUS
   sem_t            exclsem;    /* Held while chip is selected for mutual exclusion */
@@ -748,8 +750,6 @@ static void spi_dmatxcallback(DMA_HANDLE handle, uint8_t isr, void *arg)
 static void spi_dmarxsetup(FAR struct stm32_spidev_s *priv, FAR void *rxbuffer,
                            FAR void *rxdummy, size_t nwords)
 {
-  uint32_t ccr;
-
   /* 8- or 16-bit mode? */
 
   if (spi_16bitmode(priv))
@@ -758,12 +758,12 @@ static void spi_dmarxsetup(FAR struct stm32_spidev_s *priv, FAR void *rxbuffer,
 
       if (rxbuffer)
         {
-          ccr      = SPI_RXDMA16_CONFIG;
+          priv->rxccr = SPI_RXDMA16_CONFIG;
         }
       else
         {
-          rxbuffer = rxdummy;
+          rxbuffer    = rxdummy;
-          ccr      = SPI_RXDMA16NULL_CONFIG;
+          priv->rxccr = SPI_RXDMA16NULL_CONFIG;
         }
     }
   else
@@ -772,18 +772,19 @@ static void spi_dmarxsetup(FAR struct stm32_spidev_s *priv, FAR void *rxbuffer,
 
       if (rxbuffer)
         {
-          ccr = SPI_RXDMA8_CONFIG;
+          priv->rxccr = SPI_RXDMA8_CONFIG;
         }
       else
         {
-          rxbuffer = rxdummy;
+          rxbuffer    = rxdummy;
-          ccr      = SPI_RXDMA8NULL_CONFIG;
+          priv->rxccr = SPI_RXDMA8NULL_CONFIG;
         }
      }
 
   /* Configure the RX DMA */
 
-  stm32_dmasetup(priv->rxdma, priv->spibase + STM32_SPI_DR_OFFSET, (uint32_t)rxbuffer, nwords, ccr);
+  stm32_dmasetup(priv->rxdma, priv->spibase + STM32_SPI_DR_OFFSET,
+                 (uint32_t)rxbuffer, nwords, priv->rxccr);
 }
 #endif
 
@@ -799,8 +800,6 @@ static void spi_dmarxsetup(FAR struct stm32_spidev_s *priv, FAR void *rxbuffer,
 static void spi_dmatxsetup(FAR struct stm32_spidev_s *priv, FAR const void *txbuffer,
                            FAR const void *txdummy, size_t nwords)
 {
-  uint32_t ccr;
-
   /* 8- or 16-bit mode? */
 
   if (spi_16bitmode(priv))
@@ -809,12 +808,12 @@ static void spi_dmatxsetup(FAR struct stm32_spidev_s *priv, FAR const void *txbu
 
       if (txbuffer)
         {
-          ccr      = SPI_TXDMA16_CONFIG;
+          priv->txccr = SPI_TXDMA16_CONFIG;
         }
       else
         {
-          txbuffer = txdummy;
+          txbuffer    = txdummy;
-          ccr      = SPI_TXDMA16NULL_CONFIG;
+          priv->txccr = SPI_TXDMA16NULL_CONFIG;
         }
     }
   else
@@ -823,18 +822,19 @@ static void spi_dmatxsetup(FAR struct stm32_spidev_s *priv, FAR const void *txbu
 
       if (txbuffer)
         {
-          ccr      = SPI_TXDMA8_CONFIG;
+          priv->txccr = SPI_TXDMA8_CONFIG;
         }
       else
         {
-          txbuffer = txdummy;
+          txbuffer    = txdummy;
-          ccr      = SPI_TXDMA8NULL_CONFIG;
+          priv->txccr = SPI_TXDMA8NULL_CONFIG;
         }
     }
 
   /* Setup the TX DMA */
 
-  stm32_dmasetup(priv->txdma, priv->spibase + STM32_SPI_DR_OFFSET,(uint32_t)txbuffer, nwords, ccr);
+  stm32_dmasetup(priv->txdma, priv->spibase + STM32_SPI_DR_OFFSET,
+                 (uint32_t)txbuffer, nwords, priv->txccr);
 }
 #endif
 
@@ -1180,7 +1180,7 @@ static void spi_setbits(FAR struct spi_dev_s *dev, int nbits)
       spi_modifycr1(priv, 0, SPI_CR1_SPE);
       spi_modifycr1(priv, setbits, clrbits);
       spi_modifycr1(priv, SPI_CR1_SPE, 0);
-      
+
       /* Save the selection so the subsequence re-configurations will be faster */
 
 #ifndef CONFIG_SPI_OWNBUS
@@ -1353,9 +1353,11 @@ static void spi_exchange_nodma(FAR struct spi_dev_s *dev, FAR const void *txbuff
 static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
                          FAR void *rxbuffer, size_t nwords)
 {
+  FAR struct stm32_spidev_s *priv = (FAR struct stm32_spidev_s *)dev;
+
 #ifdef CONFIG_STM32_DMACAPABLE
-  if ((txbuffer && !stm32_dmacapable((uint32_t)txbuffer)) ||
+  if ((txbuffer && !stm32_dmacapable((uint32_t)txbuffer, nwords, priv->txccr)) ||
-      (rxbuffer && !stm32_dmacapable((uint32_t)rxbuffer)))
+      (rxbuffer && !stm32_dmacapable((uint32_t)rxbuffer, nwords, priv->rxccr)))
     {
       /* Unsupported memory region, fall back to non-DMA method. */
 
@@ -1364,7 +1366,6 @@ static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
   else
 #endif
     {
-      FAR struct stm32_spidev_s *priv = (FAR struct stm32_spidev_s *)dev;
       static uint16_t rxdummy = 0xffff;
       static const uint16_t txdummy = 0xffff;
 
@@ -1513,7 +1514,7 @@ static void spi_portinitialize(FAR struct stm32_spidev_s *priv)
   priv->rxdma = stm32_dmachannel(priv->rxch);
   priv->txdma = stm32_dmachannel(priv->txch);
   DEBUGASSERT(priv->rxdma && priv->txdma);
-  
+
   spi_putreg(priv, STM32_SPI_CR2_OFFSET, SPI_CR2_RXDMAEN | SPI_CR2_TXDMAEN);
 #endif