From ce574b5eef0f0da863ebf60d74ee326da077be73 Mon Sep 17 00:00:00 2001
From: Lukas Mandak <lukas.mandak@onsemi.com>
Date: Wed, 28 Mar 2018 18:57:05 +0200
Subject: [PATCH] NCS36510: Added watchdog implementation.

---
 .../TARGET_NCS36510/watchdog_api.c            | 114 ++++++++++++++++++
 targets/targets.json                          |   1 +
 2 files changed, 115 insertions(+)
 create mode 100644 targets/TARGET_ONSEMI/TARGET_NCS36510/watchdog_api.c

diff --git a/targets/TARGET_ONSEMI/TARGET_NCS36510/watchdog_api.c b/targets/TARGET_ONSEMI/TARGET_NCS36510/watchdog_api.c
new file mode 100644
index 0000000000..02c98c71f7
--- /dev/null
+++ b/targets/TARGET_ONSEMI/TARGET_NCS36510/watchdog_api.c
@@ -0,0 +1,114 @@
+/**
+ *******************************************************************************
+ * @file    watchdog_api.c
+ * @brief Implementation of watchdog_api
+ * @internal
+ * @author  ON Semiconductor
+ ******************************************************************************
+ * Copyright 2018 Semiconductor Components Industries LLC (d/b/a “ON Semiconductor”).
+ * All rights reserved.  This software and/or documentation is licensed by ON Semiconductor
+ * under limited terms and conditions.  The terms and conditions pertaining to the software
+ * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
+ * (“ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software”) and
+ * if applicable the software license agreement.  Do not use this software and/or
+ * documentation unless you have carefully read and you agree to the limited terms and
+ * conditions.  By using this software and/or documentation, you agree to the limited
+ * terms and conditions.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
+ * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
+ * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
+ * @endinternal
+ *
+ */
+#include "watchdog_api.h"
+#if DEVICE_WATCHDOG
+
+#include "clock.h" // Peripheral clock control definitions.
+#include "wdt_map.h" // Watchdog hardware register definitions.
+#include "memory_map.h" // Pointer to watchdog peripheral in memory.
+
+
+// watchdog_api feature definitions
+#define WDT_MAX_TIMEOUT_MS             ((uint32_t)8000)
+#define WDT_CAN_UPDATE                 ((boolean)True)
+#define WDT_CAN_STOP                   ((boolean)True)
+
+// WDT LOAD register definitions
+#define WDT_MAX_LOAD_VAL               ((uint32_t)0x3FFFF)
+#define WDT_TICKS_PER_MS               (WDT_MAX_LOAD_VAL / WDT_MAX_TIMEOUT_MS)
+
+// WDT KICK register definitions
+#define WDT_KICK_VAL                   ((uint32_t)1)
+
+// WDT LOCK register definitions
+#define WDT_LOCK_DISABLE               ((uint32_t)0x1ACCE551)
+#define WDT_LOCK_ENABLE                ((uint32_t)0x00000000)
+
+
+watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
+{
+    if (!config || config->timeout_ms > WDT_MAX_TIMEOUT_MS || config->timeout_ms == 0) {
+        return WATCHDOG_STATUS_INVALID_ARGUMENT;
+    }
+
+    if (!CLOCK_IS_ENABLED(CLOCK_WDOG)) {
+        CLOCK_ENABLE(CLOCK_WDOG);
+    }
+
+    // Disable write lock in case WDT is being reconfigured.
+    WDTREG->LOCK = WDT_LOCK_DISABLE;
+
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_ANY);
+    WDTREG->LOAD = config->timeout_ms * WDT_TICKS_PER_MS;
+
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_LOAD);
+    WDTREG->CONTROL.BITS.WDT_EN = True;
+
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_CONTROL);
+    WDTREG->LOCK = WDT_LOCK_ENABLE;
+
+    return WATCHDOG_STATUS_OK;
+}
+
+void hal_watchdog_kick(void)
+{
+    // Write any value to kick watchdog.
+    WDTREG->KICK = WDT_KICK_VAL;
+}
+
+watchdog_status_t hal_watchdog_stop(void)
+{
+    WDTREG->LOCK = WDT_LOCK_DISABLE;
+
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_ANY);
+    WDTREG->CONTROL.BITS.WDT_EN = False;
+
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_ANY);
+    CLOCK_DISABLE(CLOCK_WDOG);
+
+    return  WATCHDOG_STATUS_OK;
+}
+
+uint32_t hal_watchdog_get_reload_value(void)
+{
+    while (WDTREG->STATUS.BITS.WRITE_BUSY_LOAD);
+    return WDTREG->LOAD / WDT_TICKS_PER_MS;
+}
+
+watchdog_features_t hal_watchdog_get_platform_features(void)
+{
+    const watchdog_features_t features = {
+            .max_timeout = WDT_MAX_TIMEOUT_MS,
+            .update_config = WDT_CAN_UPDATE,
+            .disable_watchdog = WDT_CAN_STOP
+    };
+
+    return features;
+}
+
+
+#endif // DEVICE_WATCHDOG
+
diff --git a/targets/targets.json b/targets/targets.json
index f54ff6e989..9c61672eb9 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -7457,6 +7457,7 @@
             "SPI",
             "TRNG",
             "SPISLAVE",
+            "WATCHDOG",
             "802_15_4_PHY",
             "MPU",
             "USTICKER"