src: add get code to get controller time

src/controller_time_nrf54.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+/** This file implements controller time management for 54 Series devices
+ */
+
+// BK: taken from ncs/nrf/samples/bluetooth/conn_time_sync/src/controller_time_nrf54.c
+
+#include <zephyr/kernel.h>
+#include <nrfx_grtc.h>
+#include "controller_time.h"
+
+static uint8_t grtc_channel;
+
+int controller_time_init(void)
+{
+	int ret;
+
+	ret = nrfx_grtc_channel_alloc(&grtc_channel);
+	if (ret != NRFX_SUCCESS) {
+		printk("Failed allocating GRTC channel (ret: %d)\n",
+		       ret - NRFX_ERROR_BASE_NUM);
+		return -ENODEV;
+	}
+
+	nrf_grtc_sys_counter_compare_event_enable(NRF_GRTC, grtc_channel);
+
+	return 0;
+}
+
+uint64_t controller_time_us_get(void)
+{
+	int ret;
+	uint64_t current_time_us;
+
+	ret = nrfx_grtc_syscounter_get(&current_time_us);
+	if (ret != NRFX_SUCCESS) {
+		printk("Failed obtaining system time (ret: %d)\n", ret - NRFX_ERROR_BASE_NUM);
+		return 0;
+	}
+
+	return current_time_us;
+}
+
+void controller_time_trigger_set(uint64_t timestamp_us)
+{
+	int ret;
+
+	nrfx_grtc_channel_t chan_data = {
+		.channel = grtc_channel,
+	};
+
+	ret = nrfx_grtc_syscounter_cc_absolute_set(&chan_data, timestamp_us, false);
+	if (ret != NRFX_SUCCESS) {
+		printk("Failed setting CC (ret: %d)\n", ret - NRFX_ERROR_BASE_NUM);
+	}
+}
+
+uint32_t controller_time_trigger_event_addr_get(void)
+{
+	return nrf_grtc_event_address_get(NRF_GRTC,
+					  nrf_grtc_sys_counter_compare_event_get(grtc_channel));
+}
+
+SYS_INIT(controller_time_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);