xtensa/esp32: Add Partition and OTA device

arch/xtensa/src/esp32/Kconfig

@@ -29,6 +29,14 @@ config ESP32_RT_TIMER
 	bool "Real-time Timer"
 	default n
 
+config ESP32_PARTITION
+	bool "ESP32 Partition"
+	default n
+	select ESP32_SPIFLASH
+	---help---
+		Decode esp-idf's partition file and initialize
+		partition by nuttx MTD.
+
 menu "ESP32 Peripheral Selection"
 
 config ESP32_UART
@@ -688,4 +696,17 @@ config ESP32_RT_TIMER_TASK_STACK_SIZE
 
 endmenu # Real-Time Timer
 
+menu "Partition Configuration"
+	depends on ESP32_PARTITION
+
+config ESP32_PARTITION_OFFSET
+	hex "Partition offset"
+	default "0x8000"
+
+config ESP32_PARTITION_MOUNT
+	string "Partition mount point"
+	default "/dev/esp/partition/"
+
+endmenu # ESP32_PARTITION
+
 endif # ARCH_CHIP_ESP32

arch/xtensa/src/esp32/Make.defs

@@ -153,6 +153,10 @@ ifeq ($(CONFIG_XTENSA_IMEM_PROCFS),y)
 CHIP_CSRCS += esp32_procfs_imm.c
 endif
 
+ifeq ($(CONFIG_ESP32_PARTITION),y)
+CHIP_CSRCS += esp32_partition.c
+endif
+
 ifeq ($(CONFIG_ARCH_USE_MODULE_TEXT),y)
 CHIP_CSRCS += esp32_modtext.c
 CMN_ASRCS += xtensa_loadstore.S

arch/xtensa/src/esp32/esp32_partition.h

@@ -0,0 +1,72 @@
+/****************************************************************************
+ * arch/xtensa/src/esp32/esp32_partition.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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_XTENSA_SRC_ESP32_ESP32_PARTITION_H
+#define __ARCH_XTENSA_SRC_ESP32_ESP32_PARTITION_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <nuttx/mtd/mtd.h>
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp32_partition_init
+ *
+ * Description:
+ *   Initialize ESP32 partition. Read partition information of esp-idf,
+ *   and create MTD by these data
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   0 if success or a negative value if fail.
+ *
+ ****************************************************************************/
+
+int esp32_partition_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+#undef EXTERN
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_XTENSA_SRC_ESP32_ESP32_PARTITION_H */

boards/xtensa/esp32/esp32-core/src/esp32_bringup.c

@@ -66,6 +66,7 @@
 
 #include "esp32_wlan.h"
 #include "esp32_spiflash.h"
+#include "esp32_partition.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -184,6 +185,16 @@ int esp32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_ESP32_PARTITION
+  ret = esp32_partition_init();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to initialize partition error=%d\n",
+             ret);
+      return ret;
+    }
+#endif
+
 #ifdef CONFIG_ESP32_WIRELESS
 
 #ifdef CONFIG_ESP32_WIFI_SAVE_PARAM