esp32c3: Add system reset.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>

arch/risc-v/Kconfig

@@ -57,6 +57,7 @@ config ARCH_CHIP_ESP32C3
 	select ARCH_RV32IM
 	select RV32IM_HW_MULDIV
 	select ARCH_VECNOTIRQ
+	select ARCH_HAVE_RESET
 	---help---
 		Espressif ESP32-C3 (RV32IMC).
 

arch/risc-v/src/esp32c3/Make.defs

@@ -53,6 +53,7 @@ CHIP_CSRCS  = esp32c3_allocateheap.c esp32c3_start.c esp32c3_idle.c
 CHIP_CSRCS += esp32c3_irq.c esp32c3_timerisr.c
 CHIP_CSRCS += esp32c3_clockconfig.c esp32c3_gpio.c
 CHIP_CSRCS += esp32c3_lowputc.c
+CHIP_CSRCS += esp32c3_systemreset.c esp32c3_resetcause.c
 
 ifeq ($(CONFIG_ESP32C3_UART),y)
 CHIP_CSRCS += esp32c3_serial.c

arch/risc-v/src/esp32c3/esp32c3_resetcause.c

@@ -0,0 +1,60 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/esp32c3_resetcause.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+
+#include "hardware/esp32c3_rtccntl.h"
+
+#include "esp32c3.h"
+#include "esp32c3_resetcause.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32c3_resetcause
+ *
+ * Description:
+ *   Get the cause of the last reset.
+ *
+ ****************************************************************************/
+
+enum esp32c3_resetcause_e esp32c3_resetcause(void)
+{
+  uint32_t regmask;
+  uint32_t regshift;
+  uint32_t regval;
+
+  regval = getreg32(RTC_CNTL_RESET_STATE_REG);
+  regmask = RTC_CNTL_RESET_CAUSE_PROCPU_M;
+  regshift = RTC_CNTL_RESET_CAUSE_PROCPU_S;
+
+  return (regval & regmask) >> regshift;
+}

arch/risc-v/src/esp32c3/esp32c3_resetcause.h

@@ -0,0 +1,54 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/esp32c3_resetcause.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+enum esp32c3_resetcause_e
+{
+  ESP32C3_RESETCAUSE_SYS_CHIPPOR = 0x01,
+  ESP32C3_RESETCAUSE_SYS_RWDTSR  = 0x10,
+  ESP32C3_RESETCAUSE_SYS_BOR     = 0x0f,
+  ESP32C3_RESETCAUSE_CORE_SOFT   = 0x03,
+  ESP32C3_RESETCAUSE_CORE_DPSP   = 0x05,
+  ESP32C3_RESETCAUSE_CORE_MWDT0  = 0x07,
+  ESP32C3_RESETCAUSE_CORE_MWDT1  = 0x08,
+  ESP32C3_RESETCAUSE_CORE_RWDT   = 0x09,
+  ESP32C3_RESETCAUSE_CPU_MWDT0   = 0x0b,
+  ESP32C3_RESETCAUSE_CPU_SOFT    = 0x0c,
+  ESP32C3_RESETCAUSE_CPU_RWDT    = 0x0d,
+  ESP32C3_RESETCAUSE_CPU_PROCPU  = 0x0e
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32c3_resetcause
+ *
+ * Description:
+ *   Get the cause of the last reset.
+ *
+ ****************************************************************************/
+
+enum esp32c3_resetcause_e esp32c3_resetcause(void);
+

arch/risc-v/src/esp32c3/esp32c3_systemreset.c

@@ -0,0 +1,54 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/esp32c3_systemreset.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+
+#include "hardware/esp32c3_rtccntl.h"
+#include "esp32c3.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_systemreset
+ *
+ * Description:
+ *   Internal reset logic.
+ *
+ ****************************************************************************/
+
+void up_systemreset(void)
+{
+  putreg32(RTC_CNTL_SW_SYS_RST, RTC_CNTL_OPTIONS0_REG);
+
+  /* Wait for the reset */
+
+  for (; ; );
+}

boards/risc-v/esp32c3/esp32c3-devkit/src/Makefile

@@ -28,6 +28,10 @@ CSRCS = esp32c3_boot.c esp32c3_bringup.c
 
 ifeq ($(CONFIG_LIB_BOARDCTL),y)
 CSRCS += esp32c3_appinit.c
+ifeq ($(CONFIG_BOARDCTL_RESET),y)
+CSRCS += esp32c3_reset.c
+endif
+
 endif
 
 ifeq ($(CONFIG_DEV_GPIO),y)

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_reset.c

@@ -0,0 +1,63 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_reset.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+
+#ifdef CONFIG_BOARDCTL_RESET
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_reset
+ *
+ * Description:
+ *   Reset board.  Support for this function is required by board-level
+ *   logic if CONFIG_BOARDCTL_RESET is selected.
+ *
+ * Input Parameters:
+ *   status - Status information provided with the reset event.  This
+ *            meaning of this status information is board-specific.  If not
+ *            used by a board, the value zero may be provided in calls to
+ *            board_reset().
+ *
+ * Returned Value:
+ *   If this function returns, then it was not possible to power-off the
+ *   board due to some constraints.  The return value in this case is a
+ *   board-specific reason for the failure to shutdown.
+ *
+ ****************************************************************************/
+
+int board_reset(int status)
+{
+  up_systemreset();
+
+  return 0;
+}
+
+#endif /* CONFIG_BOARDCTL_RESET */