arch/arm/src/max326xx: Work-in-progress RTC driver for the MAX32660

arch/arm/src/max326xx/Kconfig

@@ -126,10 +126,6 @@ config MAX326XX_HAVE_WAKEUP
 	bool
 	default n
 
-config MAX326XX_HAVE_RTC
-	bool
-	default n
-
 config MAX326XX_HAVE_CRC
 	bool
 	default n
@@ -248,7 +244,6 @@ config MAX326XX_WAKEUP
 config MAX326XX_RTC
 	bool "RTC"
 	default n
-	depends on MAX326XX_HAVE_RTC
 
 config MAX326XX_CRC
 	bool "CRC 16/32"

arch/arm/src/max326xx/Make.defs

@@ -86,6 +86,10 @@ ifeq ($(CONFIG_MAX326XX_ICC),y)
 CHIP_CSRCS += max326_icc.c
 endif
 
+ifeq ($(CONFIG_RTC_DRIVER),y)
+CHIP_CSRCS += max326_rtc_lowerhalf.c
+endif
+
 # Source Files for the MAX32620 and MAX32630
 
 # Source Files for the MAX32660
@@ -122,6 +126,12 @@ CHIP_CSRCS += max32660_gpioirq.c
 endif
 endif
 
+ifeq ($(CONFIG_MAX326XX_RTC),y)
+ifeq ($(CONFIG_ARCH_FAMILY_MAX32660),y)
+CHIP_CSRCS += max32660_rtc.c
+endif
+endif
+
 ifeq ($(CONFIG_MAX32XX_WDT),y)
 ifeq ($(CONFIG_ARCH_FAMILY_MAX32660),y)
 CHIP_CSRCS += max32660_rtc.c

arch/arm/src/max326xx/hardware/max32660_rtc.h

@@ -69,7 +69,7 @@
 
 /* Register Bit-field Definitions ***************************************************/
 
-/* Seconds Counter Register (32-bit seconds count) */
+/* Seconds Counter Register (32-bit seconds counter) */
 /* Sub-Seconds Counter Register */
 
 #define RTC_SSEC_MASK             (0xff)    /* Bits 0-7: Sub-second counter */

arch/arm/src/max326xx/max32660/max32660_dma.c

@@ -221,7 +221,7 @@ static int max326_dmach_interrupt(int irq, FAR void *context, FAR void *arg)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: stm32_dmainitialize
+ * Name: up_dma_initialize
  *
  * Description:
  *   Initialize the DMA subsystem

arch/arm/src/max326xx/max326_rtc.h

@@ -0,0 +1,168 @@
+/****************************************************************************
+ * arch/arm/src/max326xx/max326_rtc.h
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org> (On-going support and development)
+ *
+ * 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_MAX326XX_MAX326_RTC_H
+#define __ARCH_ARM_SRC_MAX326XX_MAX326_RTC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* Type of callback invoked when an ALARM interrupt occurs */
+
+typedef CODE void (*alm_callback_t)(FAR void *arg, unsigned int alarmid);
+
+/* Structure used to pass parameters to query an alarm */
+
+struct alm_rdalarm_s
+{
+  FAR struct rtc_time *ar_time; /* Argument for storing ALARM RTC time */
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: max326_rtc_setalarm
+ *
+ * Description:
+ *   Set an alarm to an absolute time using associated hardware.
+ *
+ * Input Parameters:
+ *  ts  - Alarm time
+ *  cb  - Callback invoked when alarm expires
+ *  arg - Argument passed with the alarm
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+int max326_rtc_setalarm(FAR struct timespec *ts, alm_callback_t cb,
+                        FAR void *arg);
+#endif
+
+/****************************************************************************
+ * Name: max326_rtc_rdalarm
+ *
+ * Description:
+ *   Query an alarm configured in hardware.
+ *
+ * Input Parameters:
+ *  alminfo - Information about the alarm configuration.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+int max326_rtc_rdalarm(FAR struct alm_rdalarm_s *alminfo);
+#endif
+
+/****************************************************************************
+ * Name: max326_rtc_cancelalarm
+ *
+ * Description:
+ *   Cancel a pending alarm alarm
+ *
+ * Input Parameters:
+ *   none
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+int max326_rtc_cancelalarm(void);
+#endif
+
+/****************************************************************************
+ * Name: max326_rtc_lowerhalf
+ *
+ * Description:
+ *   Instantiate the RTC lower half driver for the MAX326XX.  General usage:
+ *
+ *     #include <nuttx/timers/rtc.h>
+ *     #include "max326_rtc.h"
+ *
+ *     struct rtc_lowerhalf_s *lower;
+ *     lower = max326_rtc_lowerhalf();
+ *     rtc_initialize(0, lower);
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   On success, a non-NULL RTC lower interface is returned.  NULL is
+ *   returned on any failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_DRIVER
+struct rtc_lowerhalf_s;
+FAR struct rtc_lowerhalf_s *max326_rtc_lowerhalf(void);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_SRC_MAX326XX_MAX326_RTC_H */