xtensa/esp32: Wrap wdt deinitialization in a function

arch/xtensa/src/esp32/Make.defs

@@ -22,7 +22,7 @@
 
 HEAD_ASRC  = xtensa_vectors.S xtensa_window_vector.S xtensa_windowspill.S
 HEAD_ASRC += xtensa_int_handlers.S  xtensa_user_handler.S
-HEAD_CSRC  = esp32_start.c
+HEAD_CSRC  = esp32_start.c esp32_wdt.c
 
 # Common XTENSA files (arch/xtensa/src/common)
 
@@ -169,12 +169,9 @@ ifeq ($(CONFIG_ESP32_PARTITION),y)
 CHIP_CSRCS += esp32_partition.c
 endif
 
-ifeq ($(CONFIG_ESP32_WDT),y)
-CHIP_CSRCS += esp32_wdt.c
 ifeq ($(CONFIG_WATCHDOG),y)
 CHIP_CSRCS += esp32_wdt_lowerhalf.c
 endif
-endif
 
 ifeq ($(CONFIG_ARCH_HAVE_EXTRA_HEAPS),y)
 CHIP_CSRCS += esp32_extraheaps.c

arch/xtensa/src/esp32/esp32_start.c

@@ -40,6 +40,7 @@
 #include "esp32_region.h"
 #include "esp32_start.h"
 #include "esp32_spiram.h"
+#include "esp32_wdt.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -126,11 +127,7 @@ void IRAM_ATTR __start(void)
    * start the NuttX environment.
    */
 
-  putreg32(RTC_CNTL_WDT_WKEY_VALUE, RTC_CNTL_WDTWPROTECT_REG);
+  esp32_wdt_early_deinit();
-  regval  = getreg32(RTC_CNTL_WDTCONFIG0_REG);
-  regval &= ~RTC_CNTL_WDT_EN;
-  putreg32(regval, RTC_CNTL_WDTCONFIG0_REG);
-  putreg32(0, RTC_CNTL_WDTWPROTECT_REG);
 
   /* Set CPU frequency configured in board.h */
 

arch/xtensa/src/esp32/esp32_wdt.c

@@ -961,6 +961,24 @@ FAR struct esp32_wdt_dev_s *esp32_wdt_init(uint8_t wdt_id)
     return (FAR struct esp32_wdt_dev_s *)wdt;
 }
 
+/****************************************************************************
+ * Name: esp32_wdt_early_deinit
+ *
+ * Description:
+ *   Disable the WDT(s) that was/were enabled by the bootloader.
+ *
+ ****************************************************************************/
+
+void esp32_wdt_early_deinit(void)
+{
+  uint32_t regval;
+  putreg32(RTC_CNTL_WDT_WKEY_VALUE, RTC_CNTL_WDTWPROTECT_REG);
+  regval  = getreg32(RTC_CNTL_WDTCONFIG0_REG);
+  regval &= ~RTC_CNTL_WDT_EN;
+  putreg32(regval, RTC_CNTL_WDTCONFIG0_REG);
+  putreg32(0, RTC_CNTL_WDTWPROTECT_REG);
+}
+
 /****************************************************************************
  * Name: esp32_wdt_deinit
  *

arch/xtensa/src/esp32/esp32_wdt.h

@@ -99,6 +99,7 @@ struct esp32_wdt_ops_s
  ****************************************************************************/
 
 FAR struct esp32_wdt_dev_s *esp32_wdt_init(uint8_t wdt_id);
+void esp32_wdt_early_deinit(void);
 int esp32_wdt_deinit(FAR struct esp32_wdt_dev_s *dev);
 bool esp32_wdt_is_running(FAR struct esp32_wdt_dev_s *dev);