Import Mbed OS hard-float snapshot

targets/TARGET_ARM_SSG/TARGET_CM3DS_MPS2/rtc_api.c

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+/*
+ * Copyright (c) 2018 Arm Limited
+ *
+ * Licensed 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.
+ */
+
+#include "rtc_api.h"
+#include "platform_devices.h"
+#include "rtc_pl031_drv.h"
+
+static uint32_t is_enabled = 0;
+
+/**
+ * \defgroup hal_rtc RTC hal functions
+ * @{
+ */
+
+/**
+ * \brief Initialize the RTC peripheral.
+ *        The RTC starts counting from 0x0 at reset and increments
+ *        with a frequency of 1hz (clock source: CLK1HZ).
+ *        The current value can be read through the DATA register
+ */
+void rtc_init(void)
+{
+    rtc_pl031_init(&RTC_PL031_DEV);
+    rtc_pl031_dev_enable(&RTC_PL031_DEV);
+    is_enabled = 1;
+}
+
+/**
+ * \brief Deinitialize the RTC peripheral
+ *        According to DDI0224B_RTC_PL031_TRM.pdf chapter 3.3.4 there is
+ *        no reason to implement.
+ */
+void rtc_free(void)
+{
+    is_enabled = 0;
+}
+
+/**
+ * \brief Get the RTC enable status
+ *
+ * \return 0 disabled, 1 enabled
+ */
+int rtc_isenabled(void)
+{
+    return is_enabled;
+}
+
+/**
+ * \brief Get the current time from the RTC peripheral
+ *
+ *        Sysclock and RTC clock may not be in sync which can cause reading
+ *        out metastable values. It's usually prevented by adding a loop,
+ *        however PL031 has a syncronisation block to prevent this, therefore
+ *        no additional loop needed.
+ *
+ * \return The current time in seconds
+ */
+time_t rtc_read(void)
+{
+    uint32_t val;
+    rtc_pl031_read_current_time(&RTC_PL031_DEV, &val);
+    return (time_t)val;
+}
+
+/**
+ * \brief Set the current time to the RTC peripheral, write it to LOAD register
+ *
+ * \param[in] t The current time to be set in seconds
+ */
+
+void rtc_write(time_t t)
+{
+    rtc_pl031_write_current_time(&RTC_PL031_DEV, (uint32_t)t);
+}
+/**@}*/
+