Add structure for future DMA support

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2141 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/stm32/Make.defs

@@ -46,6 +46,6 @@ CMN_CSRCS	= up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \
 
 CHIP_ASRCS	= 
 CHIP_CSRCS	= stm32_start.c stm32_rcc.c stm32_gpio.c stm32_irq.c \
-		  stm32_timerisr.c stm32_lowputc.c stm32_serial.c \
+		  stm32_timerisr.c stm32_dma.c stm32_lowputc.c stm32_serial.c \
 		  stm32_spi.c
 

arch/arm/src/stm32/stm32_dma.c

@@ -0,0 +1,84 @@
+/****************************************************************************
+ * arch/arm/src/stm32/stm32_dma.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <debug.h>
+#include <arch/irq.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "stm32_dma.h"
+#include "stm32_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+ 
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_dmachannel
+ *
+ * Description:
+ *   Allocate a DMA channel
+ *
+ * Returned Value:
+ *   On success, a void* DMA channel handle; NULL on failure
+ *
+ ****************************************************************************/
+
+DMA_HANDLE stm32_dmachannel(void)
+{
+  return NULL;
+}

arch/arm/src/stm32/stm32_internal.h

@@ -379,6 +379,8 @@
  * Public Types
  ************************************************************************************/
 
+typedef FAR void *DMA_HANDLE;
+
 /************************************************************************************
  * Inline Functions
  ************************************************************************************/
@@ -474,6 +476,19 @@ EXTERN int stm32_dumpgpio(uint32 pinset, const char *msg);
 #  define stm32_dumpgpio(p,m)
 #endif
 
+/****************************************************************************
+ * Name: stm32_dmachannel
+ *
+ * Description:
+ *   Allocate a DMA channel
+ *
+ * Returned Value:
+ *   On success, a void* DMA channel handle; NULL on failure
+ *
+ ****************************************************************************/
+
+EXTERN DMA_HANDLE stm32_dmachannel(void);
+
 /************************************************************************************
  * Function: stm32_ethinitialize
  *