Completes coding of the LPC17 DMA driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5801 42af7a65-404d-4744-a932-0658087f49c3

8 files changed, 332 insertions, 55 deletions

diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index 23ca473c8..58d078a4e 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -4470,4 +4470,6 @@
 	  Open1788 LCD and SDRAM which is used as a framebuffer (2013-3-27).
 	* arch/arm/src/lpc17xx/lpc17_gdma.c and lpc17_sdcard.c:  Began
 	  implementation of the LPC17 DMA and integration into the SDCARD
-	  driver (2013-3029).
+	  driver (2013-3-29).
+	* arch/arm/src/lpc17xx/lpc17_gdma.c: LPC17 DMA is code complete and
+	  under test.  Does not yet work (2013-3-30).
\ No newline at end of file
diff --git a/nuttx/Kconfig b/nuttx/Kconfig
index e92d1c018..904cb511a 100644
--- a/nuttx/Kconfig
+++ b/nuttx/Kconfig
@@ -443,9 +443,17 @@ config DEBUG_CAN
 	---help---
 		Enable CAN driver debug SYSLOG output (disabled by default)
 
+config DEBUG_SDIO
+	bool "Enable SDIO Debug Output"
+	default n
+	depends on MMCSD_SDIO
+	---help---
+		Enable SDIO driver debug SYSLOG output (disabled by default)
+
 config DEBUG_DMA
 	bool "Enable DMA Debug Output"
 	default n
+	depends on ARCH_DMA
 	---help---
 		Enable DMA-releated debug SYSLOG output (disabled by default)
 
diff --git a/nuttx/arch/arm/src/common/up_initialize.c b/nuttx/arch/arm/src/common/up_initialize.c
index 0ea3fcd35..f4f37c8e3 100644
--- a/nuttx/arch/arm/src/common/up_initialize.c
+++ b/nuttx/arch/arm/src/common/up_initialize.c
@@ -136,7 +136,7 @@ void up_initialize(void)
   up_pminitialize();
 #endif
 
-  /* Initialize the DMA subsystem if the weak function stm32_dmainitialize has been
+  /* Initialize the DMA subsystem if the weak function up_dmainitialize has been
    * brought into the build
    */
 
diff --git a/nuttx/arch/arm/src/lpc17xx/Kconfig b/nuttx/arch/arm/src/lpc17xx/Kconfig
index cad80ac7e..e4a3913b1 100644
--- a/nuttx/arch/arm/src/lpc17xx/Kconfig
+++ b/nuttx/arch/arm/src/lpc17xx/Kconfig
@@ -305,6 +305,7 @@ config LPC17_DAC
 config LPC17_GPDMA
 	bool "GPDMA"
 	default n
+	select ARCH_DMA
 
 config LPC17_CRC
 	bool "CRC engine"
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.c b/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.c
index 696309b5f..4edc87dbf 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.c
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.c
@@ -63,24 +63,6 @@
  * Definitions
  ****************************************************************************/
 
-/* Enables debug output from this file (needs CONFIG_DEBUG too) */
-
-#undef DMA_DEBUG     /* Define to enable debug */
-#undef DMA_VERBOSE   /* Define to enable verbose debug */
-
-#ifdef DMA_DEBUG
-#  define dmadbg  lldbg
-#  ifdef DMA_VERBOSE
-#    define spivdbg lldbg
-#  else
-#    define spivdbg(x...)
-#  endif
-#else
-#  undef DMA_VERBOSE
-#  define dmadbg(x...)
-#  define spivdbg(x...)
-#endif
-
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -89,6 +71,7 @@
 struct lpc17_dmach_s
 {
   bool inuse;              /* True: The channel is in use */
+  uint8_t chn;             /* Channel number */
   dma_callback_t callback; /* DMA completion callback function */
   void *arg;               /* Argument to pass to the callback function */
 };
@@ -124,23 +107,109 @@ static struct lpc17_gpdma_s g_gpdma;
  ****************************************************************************/
 
 /****************************************************************************
+ * Name: gpdma_interrupt
+ *
+ * Description:
+ *   The common GPDMA interrupt handler.
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static int gpdma_interrupt(int irq, FAR void *context)
+{
+  struct lpc17_dmach_s *dmach;
+  uint32_t regval;
+  uint32_t chbit;
+  int result;
+  int i;
+
+  /* Check each DMA channel */
+
+  for (i = 0; i < LPC17_NDMACH; i++)
+    {
+      chbit = DMACH((uint32_t)i);
+
+      /* Is there an interrupt pending for this channel?  If the bit for
+       * this channel is set, that indicates that a specific DMA channel
+       * interrupt request is active. The request can be generated from
+       * either the error or terminal count interrupt requests.
+       */
+
+      regval = getreg32(LPC17_DMA_INTST);
+      if ((regval & chbit) != 0)
+        {
+          /* Yes.. Is this channel assigned? Is there a callback function? */
+
+          dmach = &g_gpdma.dmach[i];
+          if (dmach->inuse && dmach->callback)
+            {
+              /* Yes.. did an error occur? */
+
+              regval = getreg32(LPC17_DMA_INTERRST);
+              if ((regval & chbit) != 0)
+                {
+                  /* Yes.. report error status */
+
+                  result = -EIO;
+                }
+
+              /* Then this must be a terminal transfer event */
+
+              else
+                {
+                  /* Let's make sure it is the terminal transfer event. */
+
+                  regval = getreg32(LPC17_DMA_INTTCST);
+                  if ((regval & chbit) != 0)
+                    {
+                      result = OK;
+                    }
+
+                  /* This should not happen */
+
+                  else
+                    {
+                      result = -EINVAL;
+                    }
+                }
+
+              /* Perform the callback */
+
+              dmach->callback((DMA_HANDLE)dmach, dmach->arg, result);
+            }
+
+          /* Disable this channel, mask any further interrupts for
+           * this channel, and clear any pending interrupts.
+           */
+
+          lpc17_dmastop((DMA_HANDLE)dmach);
+        }
+    }
+
+  return OK;
+}
+
+/****************************************************************************
  * Public Functions
  ****************************************************************************/
 
 /****************************************************************************
- * Name: lpc17_dmainitialize
+ * Name: up_dmainitialize
  *
  * Description:
  *   Initialize the GPDMA subsystem.
  *
  * Returned Value:
- *   None
+ *   Zero on success; A negated errno value on failure.
  *
  ****************************************************************************/
 
-void lpc17_dmainitilaize(void)
+void weak_function up_dmainitialize(void)
 {
   uint32_t regval;
+  int ret;
   int i;
 
   /* Enable clocking to the GPDMA block */
@@ -164,6 +233,20 @@ void lpc17_dmainitilaize(void)
   /* Initialize the DMA state structure */
 
   sem_init(&g_gpdma.exclsem, 0, 1);
+
+  for (i = 0; i < LPC17_NDMACH; i++)
+    {
+      g_gpdma.dmach[i].chn   = i;      /* Channel number */
+      g_gpdma.dmach[i].inuse = false;  /* Channel is not in-use */
+    }
+
+  /* Attach and enable the common interrupt handler */
+
+  ret = irq_attach(LPC17_IRQ_GPDMA, gpdma_interrupt);
+  if (ret == OK)
+    {
+      up_enable_irq(LPC17_IRQ_GPDMA);
+    }
 }
 
 /****************************************************************************
@@ -279,6 +362,10 @@ void lpc17_dmafree(DMA_HANDLE handle)
 
   DEBUGASSERT(dmach && dmach->inuse);
 
+  /* Make sure that the DMA channel was properly stopped */
+
+  lpc17_dmastop(handle);
+
   /* Mark the channel available.  This is an atomic operation and needs no
    * special protection.
    */
@@ -298,11 +385,81 @@ int lpc17_dmasetup(DMA_HANDLE handle, uint32_t control, uint32_t config,
                    uint32_t srcaddr, uint32_t destaddr, size_t nxfrs)
 {
   struct lpc17_dmach_s *dmach = (DMA_HANDLE)handle;
+  uint32_t chbit;
+  uint32_t regval;
+  uint32_t base;
 
   DEBUGASSERT(dmach && dmach->inuse);
-#warning "Missing logic"
 
-  return -ENOSYS;
+  chbit = DMACH((uint32_t)dmach->chn);
+  base  = LPC17_DMACH_BASE((uint32_t)dmach->chn);
+
+  /* Put the channel in a known state.  Zero disables everything */
+
+  putreg32(0, base + LPC17_DMACH_CONTROL_OFFSET);
+  putreg32(0, base + LPC17_DMACH_CONFIG_OFFSET);
+
+  /* "Programming a DMA channel
+   *
+   * 1. "Choose a free DMA channel with the priority needed. DMA channel 0
+   *     has the highest priority and DMA channel 7 the lowest priority.
+   */
+
+   regval = getreg32(LPC17_DMA_ENBLDCHNS);
+   if ((regval & chbit) != 0)
+     {
+       /* There is an active DMA on this channel! */
+
+       return -EBUSY;
+     }
+
+  /* 2. "Clear any pending interrupts on the channel to be used by writing
+   *     to the DMACIntTCClear and DMACIntErrClear register. The previous
+   *     channel operation might have left interrupt active.
+   */
+
+  putreg32(chbit, LPC17_DMA_INTTCCLR);
+  putreg32(chbit, LPC17_DMA_INTERRCLR);
+
+  /* 3. "Write the source address into the DMACCxSrcAddr register. */
+
+  putreg32(srcaddr, base + LPC17_DMACH_SRCADDR_OFFSET);
+
+  /* 4. "Write the destination address into the DMACCxDestAddr register. */
+
+  putreg32(destaddr, base + LPC17_DMACH_DESTADDR_OFFSET);
+
+  /* 5. "Write the address of the next LLI into the DMACCxLLI register. If
+   *     the transfer comprises of a single packet of data then 0 must be
+   *     written into this register.
+   */
+
+  putreg32(0, base + LPC17_DMACH_LLI_OFFSET);
+
+  /* 6. "Write the control information into the DMACCxControl register."
+   *
+   * The caller provides all CONTROL register fields except for the transfer
+   * size which is passed as a separate parameter and for the terminal count
+   * interrupt enable bit which is controlled by the driver.
+   */
+
+  regval  = control & ~(DMACH_CONTROL_XFRSIZE_MASK|DMACH_CONTROL_I);
+  regval |= ((uint32_t)nxfrs << DMACH_CONTROL_XFRSIZE_SHIFT);
+  putreg32(regval, base + LPC17_DMACH_CONTROL_OFFSET);
+
+  /* 7. "Write the channel configuration information into the DMACCxConfig
+   *     register. If the enable bit is set then the DMA channel is
+   *     automatically enabled."
+   *
+   * Only the SRCPER, DSTPER, and XFRTTYPE fields of the CONFIG register
+   * are provided by the caller.  Little endian is assumed.
+   */
+
+  regval = config & (DMACH_CONFIG_SRCPER_MASK|DMACH_CONFIG_DSTPER_MASK|
+                     DMACH_CONFIG_XFRTYPE_MASK);
+  putreg32(regval, base + LPC17_DMACH_CONFIG_OFFSET);
+
+  return OK;
 }
 
 /****************************************************************************
@@ -316,6 +473,9 @@ int lpc17_dmasetup(DMA_HANDLE handle, uint32_t control, uint32_t config,
 int lpc17_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg)
 {
   struct lpc17_dmach_s *dmach = (DMA_HANDLE)handle;
+  uint32_t regval;
+  uint32_t chbit;
+  uint32_t base;
 
   DEBUGASSERT(dmach && dmach->inuse && callback);
 
@@ -324,9 +484,29 @@ int lpc17_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg)
   dmach->callback = callback;
   dmach->arg      = arg;
 
-  /* Start the DMA */
-#warning "Missing logic"
-  return -ENOSYS;
+  /* Clear any pending DMA interrupts */
+
+  chbit = DMACH((uint32_t)dmach->chn);
+  putreg32(chbit, LPC17_DMA_INTTCCLR);
+  putreg32(chbit, LPC17_DMA_INTERRCLR);
+
+  /* Enable terminal count interrupt */
+
+  base    = LPC17_DMACH_BASE((uint32_t)dmach->chn);
+  regval  = getreg32(base + LPC17_DMACH_CONTROL_OFFSET);
+  regval |= DMACH_CONTROL_I;
+  putreg32(regval, base + LPC17_DMACH_CONTROL_OFFSET);
+
+  /* Enable the channel and unmask terminal count and error interrupts.
+   * According to the user manual, zero masks and one unmasks (hence,
+   * these are really enables).
+   */
+
+  regval  = getreg32(base + LPC17_DMACH_CONFIG_OFFSET);
+  regval |= (DMACH_CONFIG_E | DMACH_CONFIG_IE | DMACH_CONFIG_ITC);
+  putreg32(regval, base + LPC17_DMACH_CONFIG_OFFSET);
+
+  return OK;
 }
 
 /****************************************************************************
@@ -342,9 +522,27 @@ int lpc17_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg)
 void lpc17_dmastop(DMA_HANDLE handle)
 {
   struct lpc17_dmach_s *dmach = (DMA_HANDLE)handle;
+  uint32_t regaddr;
+  uint32_t regval;
+  uint32_t chbit;
 
   DEBUGASSERT(dmach && dmach->inuse);
-#warning "Missing logic"
+
+  /* Disable this channel and mask any further interrupts from the channel.
+   * this channel.  The channel is disabled by clearning the channel
+   * enable bit. Any outstanding data in the FIFO’s is lost.
+   */
+
+  regaddr = LPC17_DMACH_CONFIG((uint32_t)dmach->chn);
+  regval  = getreg32(regaddr);
+  regval &= ~(DMACH_CONFIG_E | DMACH_CONFIG_IE | DMACH_CONFIG_ITC);
+  putreg32(regval, regaddr);
+
+  /* Clear any pending interrupts for this channel */
+
+  chbit = DMACH((uint32_t)dmach->chn);
+  putreg32(chbit, LPC17_DMA_INTTCCLR);
+  putreg32(chbit, LPC17_DMA_INTERRCLR);
 }
 
 /****************************************************************************
@@ -359,9 +557,33 @@ void lpc17_dmastop(DMA_HANDLE handle)
 void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs)
 {
   struct lpc17_dmach_s *dmach = (DMA_HANDLE)handle;
-
-  DEBUGASSERT(dmach && dmach->inuse);
-#warning "Missing logic"
+  uint32_t base;
+
+  DEBUGASSERT(dmach);
+
+  /* Sample the global DMA registers */
+
+  regs->gbl.intst       = getreg32(LPC17_DMA_INTST);
+  regs->gbl.inttcst     = getreg32(LPC17_DMA_INTTCST);
+  regs->gbl.interrst    = getreg32(LPC17_DMA_INTERRST);
+  regs->gbl.rawinttcst  = getreg32(LPC17_DMA_RAWINTTCST);
+  regs->gbl.rawinterrst = getreg32(LPC17_DMA_RAWINTERRST);
+  regs->gbl.enbldchns   = getreg32(LPC17_DMA_ENBLDCHNS);
+  regs->gbl.softbreq    = getreg32(LPC17_DMA_SOFTBREQ);
+  regs->gbl.softsreq    = getreg32(LPC17_DMA_SOFTSREQ);
+  regs->gbl.softlbreq   = getreg32(LPC17_DMA_SOFTLBREQ);
+  regs->gbl.softlsreq   = getreg32(LPC17_DMA_SOFTLSREQ);
+  regs->gbl.config      = getreg32(LPC17_DMA_CONFIG);
+  regs->gbl.sync        = getreg32(LPC17_DMA_SYNC);
+
+  /* Sample the DMA channel registers */
+
+  base                  = LPC17_DMACH_BASE((uint32_t)dmach->chn);
+  regs->ch.srcaddr      = getreg32(base + LPC17_DMACH_SRCADDR_OFFSET);
+  regs->ch.destaddr     = getreg32(base + LPC17_DMACH_DESTADDR_OFFSET);
+  regs->ch.lli          = getreg32(base + LPC17_DMACH_LLI_OFFSET);
+  regs->ch.control      = getreg32(base + LPC17_DMACH_CONTROL_OFFSET);
+  regs->ch.config       = getreg32(base + LPC17_DMACH_CONFIG_OFFSET);
 }
 #endif /* CONFIG_DEBUG_DMA */
 
@@ -374,12 +596,58 @@ void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs)
  ****************************************************************************/
 
 #ifdef CONFIG_DEBUG_DMA
-void lpc17_dmadump(DMA_HANDLE handle, const struct lpc17_dmaregs_s *regs, const char *msg)
+void lpc17_dmadump(DMA_HANDLE handle, const struct lpc17_dmaregs_s *regs,
+                   const char *msg)
 {
   struct lpc17_dmach_s *dmach = (DMA_HANDLE)handle;
-
-  DEBUGASSERT(dmach && dmach->inuse);
-#warning "Missing logic"
+  uint32_t base;
+
+  DEBUGASSERT(dmach);
+
+  /* Dump the sampled global DMA registers */
+
+  dmadbg("Global GPDMA Registers: %s\n", msg);
+  dmadbg("       INTST[%08x]: %08x\n",
+         LPC17_DMA_INTST, regs->gbl.intst);
+  dmadbg("     INTTCST[%08x]: %08x\n",
+         LPC17_DMA_INTTCST, regs->gbl.inttcst);
+  dmadbg("    INTERRST[%08x]: %08x\n",
+         LPC17_DMA_INTERRST, regs->gbl.interrst);
+  dmadbg("  RAWINTTCST[%08x]: %08x\n",
+         LPC17_DMA_RAWINTTCST, regs->gbl.rawinttcst);
+  dmadbg(" RAWINTERRST[%08x]: %08x\n",
+         LPC17_DMA_RAWINTERRST, regs->gbl.rawinterrst);
+  dmadbg("   ENBLDCHNS[%08x]: %08x\n",
+         LPC17_DMA_ENBLDCHNS, regs->gbl.enbldchns);
+  dmadbg("    SOFTBREQ[%08x]: %08x\n",
+         LPC17_DMA_SOFTBREQ, regs->gbl.softbreq);
+  dmadbg("    SOFTSREQ[%08x]: %08x\n",
+         LPC17_DMA_SOFTSREQ, regs->gbl.softsreq);
+  dmadbg("   SOFTLBREQ[%08x]: %08x\n",
+         LPC17_DMA_SOFTLBREQ, regs->gbl.softlbreq);
+  dmadbg("   SOFTLSREQ[%08x]: %08x\n",
+         LPC17_DMA_SOFTLSREQ, regs->gbl.softlsreq);
+  dmadbg("      CONFIG[%08x]: %08x\n",
+         LPC17_DMA_CONFIG, regs->gbl.config);
+  dmadbg("        SYNC[%08x]: %08x\n",
+         LPC17_DMA_SYNC, regs->gbl.sync);
+
+  /* Dump the DMA channel registers */
+
+  base = LPC17_DMACH_BASE((uint32_t)dmach->chn);
+
+  dmadbg("Channel GPDMA Registers: %d\n", dmach->chn);
+
+  dmadbg("     SRCADDR[%08x]: %08x\n",
+         base + LPC17_DMACH_SRCADDR_OFFSET, regs->ch.srcaddr);
+  dmadbg("    DESTADDR[%08x]: %08x\n",
+         base + LPC17_DMACH_DESTADDR_OFFSET, regs->ch.destaddr);
+  dmadbg("         LLI[%08x]: %08x\n",
+         base + LPC17_DMACH_LLI_OFFSET, regs->ch.lli);
+  dmadbg("     CONTROL[%08x]: %08x\n",
+         base + LPC17_DMACH_CONTROL_OFFSET, regs->ch.control);
+  dmadbg("      CONFIG[%08x]: %08x\n",
+         base + LPC17_DMACH_CONFIG_OFFSET, regs->ch.config);
 }
 #endif /* CONFIG_DEBUG_DMA */
 
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.h b/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.h
index 77ac811ab..cd2d10dd2 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.h
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_gpdma.h
@@ -125,17 +125,17 @@ extern "C"
  ************************************************************************************/
 
 /****************************************************************************
- * Name: lpc17_dmainitialize
+ * Name: up_dmainitialize
  *
  * Description:
- *   Initialize the GPDMA subsystem.
+ *   Initialize the GPDMA subsystem (also prototyped in up_internal.h).
  *
  * Returned Value:
- *   None
+ *   Zero on success; A negated errno value on failure.
  *
  ****************************************************************************/
 
-void lpc17_dmainitilaize(void);
+void weak_function up_dmainitialize(void);
 
 /****************************************************************************
  * Name: lpc17_dmaconfigure
@@ -224,7 +224,7 @@ void lpc17_dmastop(DMA_HANDLE handle);
  ****************************************************************************/
 
 #ifdef CONFIG_DEBUG_DMA
-EXTERN void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs);
+void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs);
 #else
 #  define lpc17_dmasample(handle,regs)
 #endif
@@ -238,8 +238,8 @@ EXTERN void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs);
  ****************************************************************************/
 
 #ifdef CONFIG_DEBUG_DMA
-EXTERN void lpc17_dmadump(DMA_HANDLE handle, const struct lpc17_dmaregs_s *regs,
-                          const char *msg);
+void lpc17_dmadump(DMA_HANDLE handle, const struct lpc17_dmaregs_s *regs,
+                   const char *msg);
 #else
 #  define lpc17_dmadump(handle,regs,msg)
 #endif
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_sdcard.c b/nuttx/arch/arm/src/lpc17xx/lpc17_sdcard.c
index f449685de..c776395a7 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_sdcard.c
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_sdcard.c
@@ -152,7 +152,11 @@
  * - Memory burst size (F4 only)
  */
 
-/* DMA control register settings */
+/* DMA control register settings.  All CONTROL register fields need to be
+ * specified except for the transfer size which is passed as a separate
+ * parameter and for the terminal count interrupt enable bit which is
+ * controlled by the driver.
+ */
 
 #define SDCARD_RXDMA32_CONTROL    (DMACH_CONTROL_SBSIZE_4|DMACH_CONTROL_DBSIZE_4|\
                                    DMACH_CONTROL_SWIDTH_32BIT|DMACH_CONTROL_DWIDTH_32BIT|\
@@ -161,19 +165,12 @@
                                    DMACH_CONTROL_SWIDTH_32BIT|DMACH_CONTROL_DWIDTH_32BIT|\
                                    DMACH_CONTROL_SI)
 
-/* DMA configuration register settings */
-
-#define SDCARD_RXDMA32_CONFIG     (DMACH_CONFIG_E|DMACH_CONFIG_SRCPER_SDCARD|\
-                                   DMACH_CONFIG_XFRTYPE_P2M)
-#define SDCARD_TXDMA32_CONFIG     (DMACH_CONFIG_E|DMACH_CONFIG_DSTPER_SDCARD|\
-                                   DMACH_CONFIG_XFRTYPE_M2P)
-
-/* SD card DMA Channel/Stream selection.  For the the case of the LPC17XX F4, there
- * are multiple DMA stream options that must be dis-ambiguated in the board.h
- * file.
+/* DMA configuration register settings.  Only the SRCPER, DSTPER, and
+ * XFRTTYPE fields of the CONFIG register need be specified.
  */
 
-#define SDCARD_DMACHAN            DMAMAP_SDCARD
+#define SDCARD_RXDMA32_CONFIG     (DMACH_CONFIG_SRCPER_SDCARD|DMACH_CONFIG_XFRTYPE_P2M)
+#define SDCARD_TXDMA32_CONFIG     (DMACH_CONFIG_DSTPER_SDCARD|DMACH_CONFIG_XFRTYPE_M2P)
 
 /* FIFO sizes */
 
diff --git a/nuttx/arch/arm/src/sam3u/Kconfig b/nuttx/arch/arm/src/sam3u/Kconfig
index 473e1d9a4..7170fdac3 100644
--- a/nuttx/arch/arm/src/sam3u/Kconfig
+++ b/nuttx/arch/arm/src/sam3u/Kconfig
@@ -20,6 +20,7 @@ menu "AT91SAM3 Peripheral Support"
 config SAM3U_DMA
 	bool "DMA"
 	default n
+	select ARCH_DMA
 
 config SAM3U_NAND
 	bool "NAND support"