SAMA5: Initial WDT timer (untested)

ChangeLog

@@ -5825,4 +5825,6 @@
 	* arch/arm/src/sama5/sam_rtc.h and other files:  Hook the SAMA5 RTC
 	  driver into the build system; Verify the correct operation of the
 	  SAMA5 RTC driver (2013-10-19).
+	* arch/arm/src/sama5/sam_wdt.c and .h:  Add a SAMA5 watchdog timer
+	  drvier. Untested on initial check-in (2013-10-19).
 

arch/arm/src/sama5/Kconfig

@@ -100,7 +100,7 @@ config SAMA5_PIT
 config SAMA5_WDT
 	bool "Watchdog timer Interrupt (WDT)"
 	default n
-	select WDT
+	select WATCHDOG
 
 config SAMA5_RTC
 	bool "Real time clock calendar (RTC)"
@@ -2019,6 +2019,41 @@ endif # SAMA5_TSD
 endmenu # Touchscreen Configuration
 endif # SAMA5_ADC
 
+if SAMA5_WDT
+
+menu "Watchdog Configuration"
+
+config SAMA5_WDT_INTERRUPT
+	bool "Interrupt on timeout"
+	default n
+	---help---
+		The normal behavior is to reset everything when a watchdog timeout
+		occurs.  An alternative behavior is to simply interrupt when the
+		timeout occurs.  This setting enables that alternative behavior.
+
+config SAMA5_WDT_DEBUGHALT
+	bool "Halt on DEBUG"
+	default y if DEBUG
+	default n if !DEBUG
+	---help---
+		Halt the watchdog timer in the debug state
+
+config SAMA5_WDT_IDLEHALT
+	bool "Halt in IDLE"
+	default y
+	---help---
+		Halt the watchdog timer in the IDLE state
+
+config SAMA5_WDT_REGDEBUG
+	bool "Register level debug"
+	default n
+	depends on DEBUG
+	---help---
+		Enable low-level register debug output
+
+endmenu # Watchdog configuration
+endif # SAMA5_WDT
+
 menu "External Memory Configuration"
 
 config SAMA5_DDRCS

arch/arm/src/sama5/Make.defs

@@ -114,6 +114,10 @@ ifeq ($(CONFIG_SAMA5_RTC),y)
 CHIP_CSRCS += sam_rtc.c
 endif
 
+ifeq ($(CONFIG_SAMA5_WDT),y)
+CHIP_CSRCS += sam_wdt.c
+endif
+
 ifeq ($(CONFIG_SAMA5_SPI0),y)
 CHIP_CSRCS += sam_spi.c
 else

arch/arm/src/sama5/sam_ethernet.h

@@ -182,7 +182,7 @@ int sam_emac_initialize(void);
  *   Some boards require specialized initialization of the PHY before it can be used.
  *   This may include such things as configuring GPIOs, resetting the PHY, etc.  If
  *   CONFIG_SAMA5_PHYINIT is defined in the configuration then the board specific
- *   logic must provide sam_phyinitialize();  The STM32 Ethernet driver will call
+ *   logic must provide sam_phyinitialize();  The SAMA5 Ethernet driver will call
  *   this function one time before it first uses the PHY.
  *
  * Parameters:

arch/arm/src/sama5/sam_rtc.h

 /************************************************************************************
- * arch/arm/src/sama5/stm_rtc.h
+ * arch/arm/src/sama5/sam_rtc.h
  *
  *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>

arch/arm/src/sama5/sam_wdt.h

+/****************************************************************************
+ * arch/arm/src/sama5/sam_wdt.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAMA5_SAM_WDT_H
+#define __ARCH_ARM_SRC_SAMA5_SAM_WDT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "chip/sam_wdt.h"
+
+#ifdef CONFIG_WATCHDOG
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_wdtinitialize
+ *
+ * Description:
+ *   Initialize the WDT watchdog timer.  The watchdog timer is intialized and
+ *   registered as 'devpath.  The initial state of the watchdog time is
+ *   disabled.
+ *
+ * Input Parameters:
+ *   devpath - The full path to the watchdog.  This should be of the form
+ *     /dev/watchdog0
+ *
+ * Returned Values:
+ *   None
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SAMA5_WDT
+void sam_wdtinitialize(FAR const char *devpath);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_WATCHDOG */
+#endif /* __ARCH_ARM_SRC_SAMA5_SAM_WDT_H */