/*
 * Copyright (c) 2017-2020 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <soc.h>
#include <bluetooth/hci.h>
#include <sys/byteorder.h>

#include "hal/cpu.h"
#include "hal/ticker.h"

#include "util/util.h"
#include "util/mem.h"
#include "util/memq.h"
#include "util/mayfly.h"

#include "ticker/ticker.h"

#include "pdu.h"

#include "lll.h"
#include "lll/lll_vendor.h"
#include "lll/lll_adv_types.h"
#include "lll_adv.h"
#include "lll/lll_adv_pdu.h"
#include "lll_adv_sync.h"
#include "lll/lll_df_types.h"
#include "lll_chan.h"

#include "ull_adv_types.h"

#include "ull_internal.h"
#include "ull_chan_internal.h"
#include "ull_adv_internal.h"

#include "ll.h"

#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER)
#define LOG_MODULE_NAME bt_ctlr_ull_adv_sync
#include "common/log.h"
#include "hal/debug.h"

static int init_reset(void);
static inline struct ll_adv_sync_set *sync_acquire(void);
static inline void sync_release(struct ll_adv_sync_set *sync);
static inline uint16_t sync_handle_get(struct ll_adv_sync_set *sync);
static inline uint8_t sync_remove(struct ll_adv_sync_set *sync,
				  struct ll_adv_set *adv, uint8_t enable);

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
static inline void adv_sync_extra_data_set_clear(void *extra_data_prev,
						 void *extra_data_new,
						 uint16_t hdr_add_fields,
						 uint16_t hdr_rem_fields,
						 void *data);
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

static uint8_t adv_sync_hdr_set_clear(struct lll_adv_sync *lll_sync,
				      struct pdu_adv *ter_pdu_prev,
				      struct pdu_adv *ter_pdu,
				      uint16_t hdr_add_fields,
				      uint16_t hdr_rem_fields,
				      void *data);

static void mfy_sync_offset_get(void *param);
static inline struct pdu_adv_sync_info *sync_info_get(struct pdu_adv *pdu);
static inline void sync_info_offset_fill(struct pdu_adv_sync_info *si,
					 uint32_t ticks_offset,
					 uint32_t start_us);
static void ticker_cb(uint32_t ticks_at_expire, uint32_t remainder,
		      uint16_t lazy, void *param);
static void ticker_op_cb(uint32_t status, void *param);

static struct ll_adv_sync_set ll_adv_sync_pool[CONFIG_BT_CTLR_ADV_SYNC_SET];
static void *adv_sync_free;

uint8_t ll_adv_sync_param_set(uint8_t handle, uint16_t interval, uint16_t flags)
{
	struct lll_adv_sync *lll_sync;
	struct ll_adv_sync_set *sync;
	struct ll_adv_set *adv;
	uint8_t err, ter_idx;

	adv = ull_adv_is_created_get(handle);
	if (!adv) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	lll_sync = adv->lll.sync;
	if (!lll_sync) {
		struct pdu_adv_com_ext_adv *ter_com_hdr;
		struct pdu_adv_ext_hdr *ter_hdr;
		struct pdu_adv *ter_pdu;
		struct lll_adv *lll;
		uint8_t *ter_dptr;
		uint8_t ter_len;
		int err;

		sync = sync_acquire();
		if (!sync) {
			return BT_HCI_ERR_MEM_CAPACITY_EXCEEDED;
		}

		lll = &adv->lll;
		lll_sync = &sync->lll;
		lll->sync = lll_sync;
		lll_sync->adv = lll;

		lll_adv_data_reset(&lll_sync->data);
		err = lll_adv_data_init(&lll_sync->data);
		if (err) {
			return BT_HCI_ERR_MEM_CAPACITY_EXCEEDED;
		}

		/* NOTE: ull_hdr_init(&sync->ull); is done on start */
		lll_hdr_init(lll_sync, sync);

		err = util_aa_le32(lll_sync->access_addr);
		LL_ASSERT(!err);

		lll_sync->data_chan_id = lll_chan_id(lll_sync->access_addr);
		lll_sync->data_chan_count =
			ull_chan_map_get(lll_sync->data_chan_map);

		lll_csrand_get(lll_sync->crc_init, sizeof(lll_sync->crc_init));

		lll_sync->latency_prepare = 0;
		lll_sync->latency_event = 0;
		lll_sync->event_counter = 0;

		sync->is_enabled = 0U;
		sync->is_started = 0U;

		ter_pdu = lll_adv_sync_data_peek(lll_sync, NULL);
		ter_pdu->type = PDU_ADV_TYPE_AUX_SYNC_IND;
		ter_pdu->rfu = 0U;
		ter_pdu->chan_sel = 0U;

		ter_pdu->tx_addr = 0U;
		ter_pdu->rx_addr = 0U;

		ter_com_hdr = (void *)&ter_pdu->adv_ext_ind;
		ter_hdr = (void *)ter_com_hdr->ext_hdr_adv_data;
		ter_dptr = ter_hdr->data;
		*(uint8_t *)ter_hdr = 0U;

		/* Non-connectable and Non-scannable adv mode */
		ter_com_hdr->adv_mode = 0U;

		/* Calc tertiary PDU len */
		ter_len = ull_adv_aux_hdr_len_calc(ter_com_hdr, &ter_dptr);
		ull_adv_aux_hdr_len_fill(ter_com_hdr, ter_len);

		ter_pdu->len = ter_len;
	} else {
		sync = (void *)HDR_LLL2EVT(lll_sync);
	}

	sync->interval = interval;

	err = ull_adv_sync_pdu_set_clear(adv, 0, 0, NULL, &ter_idx);
	if (err) {
		return err;
	}

	lll_adv_sync_data_enqueue(lll_sync, ter_idx);

	return 0;
}

uint8_t ll_adv_sync_ad_data_set(uint8_t handle, uint8_t op, uint8_t len,
				uint8_t const *const data)
{
	struct adv_pdu_field_data pdu_data;
	struct lll_adv_sync *lll_sync;
	struct ll_adv_set *adv;
	uint8_t value[5];
	uint8_t ter_idx;
	uint8_t err;

	/* TODO: handle other op values */
	if (op != BT_HCI_LE_EXT_ADV_OP_COMPLETE_DATA &&
	    op != BT_HCI_LE_EXT_ADV_OP_UNCHANGED_DATA) {
		/* FIXME: error code */
		return BT_HCI_ERR_CMD_DISALLOWED;
	}

	adv =  ull_adv_is_created_get(handle);
	if (!adv) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	lll_sync = adv->lll.sync;
	if (!lll_sync) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	pdu_data.field_data = value;
	*pdu_data.field_data = len;
	sys_put_le32((uint32_t)data, pdu_data.field_data + 1);

	err = ull_adv_sync_pdu_set_clear(adv, ULL_ADV_PDU_HDR_FIELD_AD_DATA,
					 0, &pdu_data, &ter_idx);
	if (err) {
		return err;
	}

	lll_adv_sync_data_enqueue(lll_sync, ter_idx);

	return 0;
}

uint8_t ll_adv_sync_enable(uint8_t handle, uint8_t enable)
{
	struct lll_adv_sync *lll_sync;
	struct ll_adv_sync_set *sync;
	uint8_t sync_got_enabled;
	struct ll_adv_set *adv;
	uint8_t pri_idx;
	uint8_t err;

	adv = ull_adv_is_created_get(handle);
	if (!adv) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	lll_sync = adv->lll.sync;
	if (!lll_sync) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	sync = (void *)HDR_LLL2EVT(lll_sync);

	if (!enable) {
		if (!sync->is_enabled) {
			return BT_HCI_ERR_CMD_DISALLOWED;
		}

		if (!sync->is_started) {
			sync->is_enabled = 0U;

			return 0;
		}

		err = sync_remove(sync, adv, 0U);
		return err;
	}

	/* TODO: Check for periodic data being complete */

	/* TODO: Check packet too long */

	sync_got_enabled = 0U;
	if (sync->is_enabled) {
		/* TODO: Enabling an already enabled advertising changes its
		 * random address.
		 */
	} else {
		sync_got_enabled = 1U;
	}

	if (adv->is_enabled && !sync->is_started) {
		uint32_t ticks_slot_overhead_aux;
		struct lll_adv_aux *lll_aux;
		struct ll_adv_aux_set *aux;
		uint32_t ticks_anchor_sync;
		uint32_t ticks_anchor_aux;
		uint32_t ret;

		lll_aux = adv->lll.aux;

		/* Add sync_info into auxiliary PDU */
		err = ull_adv_aux_hdr_set_clear(adv,
						ULL_ADV_PDU_HDR_FIELD_SYNC_INFO,
						0, NULL, NULL, &pri_idx);
		if (err) {
			return err;
		}

		if (lll_aux) {
			/* FIXME: Find absolute ticks until after auxiliary PDU
			 *        on air to place the periodic advertising PDU.
			 */
			ticks_anchor_aux = 0U; /* unused in this path */
			ticks_slot_overhead_aux = 0U; /* unused in this path */
			ticks_anchor_sync = ticker_ticks_now_get();
			aux = NULL;
		} else {
			lll_aux = adv->lll.aux;
			aux = (void *)HDR_LLL2EVT(lll_aux);
			ticks_anchor_aux = ticker_ticks_now_get();
			ticks_slot_overhead_aux = ull_adv_aux_evt_init(aux);
			ticks_anchor_sync =
				ticks_anchor_aux + ticks_slot_overhead_aux +
				aux->evt.ticks_slot +
				HAL_TICKER_US_TO_TICKS(EVENT_MAFS_US);
		}

		ret = ull_adv_sync_start(adv, sync, ticks_anchor_sync);
		if (ret) {
			sync_remove(sync, adv, 1U);

			return BT_HCI_ERR_INSUFFICIENT_RESOURCES;
		}

		sync->is_started = 1U;

		lll_adv_data_enqueue(&adv->lll, pri_idx);

		if (aux) {
			/* Keep aux interval equal or higher than primary PDU
			 * interval.
			 */
			aux->interval = adv->interval +
					(HAL_TICKER_TICKS_TO_US(
						ULL_ADV_RANDOM_DELAY) /
						ADV_INT_UNIT_US);

			ret = ull_adv_aux_start(aux, ticks_anchor_aux,
						ticks_slot_overhead_aux);
			if (ret) {
				sync_remove(sync, adv, 1U);

				return BT_HCI_ERR_INSUFFICIENT_RESOURCES;
			}

			aux->is_started = 1U;
		}
	}

	if (sync_got_enabled) {
		sync->is_enabled = sync_got_enabled;
	}

	return 0;
}

int ull_adv_sync_init(void)
{
	int err;

	err = init_reset();
	if (err) {
		return err;
	}

	return 0;
}

int ull_adv_sync_reset(void)
{
	int err;

	err = init_reset();
	if (err) {
		return err;
	}

	return 0;
}

uint16_t ull_adv_sync_lll_handle_get(struct lll_adv_sync *lll)
{
	return sync_handle_get((void *)lll->hdr.parent);
}

uint32_t ull_adv_sync_start(struct ll_adv_set *adv,
			    struct ll_adv_sync_set *sync,
			    uint32_t ticks_anchor)
{
#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	struct lll_df_adv_cfg *df_cfg;
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */
	uint32_t ticks_slot_overhead;
	uint32_t volatile ret_cb;
	uint32_t interval_us;
	uint8_t sync_handle;
	uint32_t slot_us;
	uint32_t ret;

	ull_hdr_init(&sync->ull);

	/* TODO: Calc AUX_SYNC_IND slot_us */
	slot_us = EVENT_OVERHEAD_START_US + EVENT_OVERHEAD_END_US;
	slot_us += 1000;

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	df_cfg = adv->df_cfg;
	if (df_cfg && df_cfg->is_enabled) {
		slot_us += CTE_LEN_US(df_cfg->cte_length);
	}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

	/* TODO: active_to_start feature port */
	sync->evt.ticks_active_to_start = 0;
	sync->evt.ticks_xtal_to_start =
		HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_XTAL_US);
	sync->evt.ticks_preempt_to_start =
		HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_PREEMPT_MIN_US);
	sync->evt.ticks_slot = HAL_TICKER_US_TO_TICKS(slot_us);

	if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
		ticks_slot_overhead = MAX(sync->evt.ticks_active_to_start,
					  sync->evt.ticks_xtal_to_start);
	} else {
		ticks_slot_overhead = 0;
	}

	interval_us = (uint32_t)sync->interval * CONN_INT_UNIT_US;

	sync_handle = sync_handle_get(sync);

	ret_cb = TICKER_STATUS_BUSY;
	ret = ticker_start(TICKER_INSTANCE_ID_CTLR, TICKER_USER_ID_THREAD,
			   (TICKER_ID_ADV_SYNC_BASE + sync_handle),
			   ticks_anchor, 0,
			   HAL_TICKER_US_TO_TICKS(interval_us),
			   HAL_TICKER_REMAINDER(interval_us), TICKER_NULL_LAZY,
			   (sync->evt.ticks_slot + ticks_slot_overhead),
			   ticker_cb, sync,
			   ull_ticker_status_give, (void *)&ret_cb);
	ret = ull_ticker_status_take(ret, &ret_cb);

	return ret;
}

void ull_adv_sync_release(struct ll_adv_sync_set *sync)
{
	lll_adv_sync_data_release(&sync->lll);
	sync_release(sync);
}

void ull_adv_sync_offset_get(struct ll_adv_set *adv)
{
	static memq_link_t link;
	static struct mayfly mfy = {0, 0, &link, NULL, mfy_sync_offset_get};
	uint32_t ret;

	mfy.param = adv;
	ret = mayfly_enqueue(TICKER_USER_ID_ULL_HIGH, TICKER_USER_ID_ULL_LOW, 1,
			     &mfy);
	LL_ASSERT(!ret);
}

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
void ull_adv_sync_update(struct ll_adv_sync_set *sync, uint32_t slot_plus_us,
			 uint32_t slot_minus_us)
{
	uint32_t ret;

	ret = ticker_update(TICKER_INSTANCE_ID_CTLR,
			    TICKER_USER_ID_THREAD,
			    (TICKER_ID_ADV_BASE + sync_handle_get(sync)),
			    0, 0,
			    slot_plus_us,
			    slot_minus_us,
			    0, 0,
			    NULL, NULL);
	LL_ASSERT((ret == TICKER_STATUS_SUCCESS) ||
		  (ret == TICKER_STATUS_BUSY));
}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

/* @brief Set or clear fields in extended advertising header and store
 *        extra_data if requested.
 *
 * @param[in]  adv              Advertising set.
 * @param[in]  hdr_add_fields   Flag with information which fields add.
 * @param[in]  hdr_rem_fields   Flag with information which fields remove.
 * @param[in]  data             Pointer to data to be added to header and
 *                              extra_data. Content depends on the value of
 *                              @p hdr_add_fields.
 * @param[out] ter_idx          Index of new PDU.
 *
 * @Note
 * @p data content depends on the flag provided by @p hdr_add_fields:
 * - ULL_ADV_PDU_HDR_FIELD_CTE_INFO:
 *   # @p data->field_data points to single byte with CTEInfo field
 *   # @p data->extra_data points to memory where is struct lll_df_adv_cfg
 *     for LLL.
 * - ULL_ADV_PDU_HDR_FIELD_AD_DATA:
 *   # @p data->field_data points to memory where first byte
 *     is size of advertising data, following byte is a pointer to actual
 *     advertising data.
 *   # @p data->extra_data is NULL
 * - ULL_ADV_PDU_HDR_FIELD_AUX_PTR: # @p data parameter is not used
 *
 * @return Zero in case of success, other value in case of failure.
 */
uint8_t ull_adv_sync_pdu_set_clear(struct ll_adv_set *adv,
				   uint16_t hdr_add_fields,
				   uint16_t hdr_rem_fields,
				   struct adv_pdu_field_data *data,
				   uint8_t *ter_idx)
{
	struct pdu_adv *pdu_prev, *pdu_new;
	struct lll_adv_sync *lll_sync;
	void *extra_data_prev;
#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	void *extra_data;
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */
	int err;

	lll_sync = adv->lll.sync;
	if (!lll_sync) {
		return BT_HCI_ERR_UNKNOWN_ADV_IDENTIFIER;
	}

	/* Get reference to previous periodic advertising PDU data */
	pdu_prev = lll_adv_sync_data_peek(lll_sync, &extra_data_prev);

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	/* Get reference to new periodic advertising PDU data buffer */
	if ((hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) ||
	    (!(hdr_rem_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) &&
	    extra_data_prev)) {
		/* If there was an extra data in past PDU data or it is required
		 * by the hdr_add_fields then allocate memmory for it.
		 */
		pdu_new = lll_adv_sync_data_alloc(lll_sync, &extra_data,
						  ter_idx);
		if (!pdu_new) {
			return BT_HCI_ERR_MEM_CAPACITY_EXCEEDED;
		}
	} else {
		extra_data = NULL;
#else
	{
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */
		pdu_new = lll_adv_sync_data_alloc(lll_sync, NULL, ter_idx);
		if (!pdu_new) {
			return BT_HCI_ERR_MEM_CAPACITY_EXCEEDED;
		}
	}

	err = adv_sync_hdr_set_clear(lll_sync, pdu_prev, pdu_new,
				     hdr_add_fields, hdr_rem_fields,
				     (data ? data->field_data : NULL));
	if (err) {
		return err;
	}

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	if (extra_data) {
		adv_sync_extra_data_set_clear(extra_data_prev, extra_data,
					      hdr_add_fields, hdr_rem_fields,
					      (data ? data->extra_data : NULL));
	}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

	return 0;
}

static int init_reset(void)
{
	/* Initialize adv sync pool. */
	mem_init(ll_adv_sync_pool, sizeof(struct ll_adv_sync_set),
		 sizeof(ll_adv_sync_pool) / sizeof(struct ll_adv_sync_set),
		 &adv_sync_free);

	return 0;
}

static inline struct ll_adv_sync_set *sync_acquire(void)
{
	return mem_acquire(&adv_sync_free);
}

static inline void sync_release(struct ll_adv_sync_set *sync)
{
	mem_release(sync, &adv_sync_free);
}

static inline uint16_t sync_handle_get(struct ll_adv_sync_set *sync)
{
	return mem_index_get(sync, ll_adv_sync_pool,
			     sizeof(struct ll_adv_sync_set));
}

static uint8_t sync_stop(struct ll_adv_sync_set *sync)
{
	uint8_t sync_handle;
	int err;

	sync_handle = sync_handle_get(sync);

	err = ull_ticker_stop_with_mark(TICKER_ID_ADV_SYNC_BASE + sync_handle,
					sync, &sync->lll);
	LL_ASSERT(err == 0 || err == -EALREADY);
	if (err) {
		return BT_HCI_ERR_CMD_DISALLOWED;
	}

	return 0;
}

static inline uint8_t sync_remove(struct ll_adv_sync_set *sync,
				  struct ll_adv_set *adv, uint8_t enable)
{
	uint8_t pri_idx;
	uint8_t err;

	/* Remove sync_info from auxiliary PDU */
	err = ull_adv_aux_hdr_set_clear(adv, 0,
					ULL_ADV_PDU_HDR_FIELD_SYNC_INFO,
					NULL, NULL, &pri_idx);
	if (err) {
		return err;
	}

	lll_adv_data_enqueue(&adv->lll, pri_idx);

	if (sync->is_started) {
		/* TODO: we removed sync info, but if sync_stop() fails, what do
		 * we do?
		 */
		err = sync_stop(sync);
		if (err) {
			return err;
		}

		sync->is_started = 0U;
	}

	if (!enable) {
		sync->is_enabled = 0U;
	}

	return 0U;
}

/* @brief Set or clear fields in extended advertising header.
 *
 * @param[in]  adv              Advertising set.
 * @param[in]  hdr_add_fields   Flag with information which fields add.
 * @param[in]  hdr_rem_fields   Flag with information which fields remove.
 * @param[in]  value            Pointer to data to be added to header.
 *                              Content depends on the value of
 *                              @p hdr_add_fields.
 * @param[out] ter_idx          Index of new PDU.
 *
 * @Note
 * @p value depends on the flag provided by @p hdr_add_fields.
 * Information about content of value may be found in description of
 * @ref ull_adv_sync_pdu_set_clear.
 *
 * @return Zero in case of success, other value in case of failure.
 */
static uint8_t adv_sync_hdr_set_clear(struct lll_adv_sync *lll_sync,
				      struct pdu_adv *ter_pdu_prev,
				      struct pdu_adv *ter_pdu,
				      uint16_t hdr_add_fields,
				      uint16_t hdr_rem_fields,
				      void *value)
{
	struct pdu_adv_com_ext_adv *ter_com_hdr, *ter_com_hdr_prev;
	struct pdu_adv_ext_hdr *ter_hdr, ter_hdr_prev;
	uint8_t *ter_dptr, *ter_dptr_prev;
	uint8_t acad_len_prev;
	uint8_t ter_len_prev;
	uint8_t hdr_buf_len;
	uint16_t ter_len;
	uint8_t *ad_data;
#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	uint8_t cte_info;
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */
	uint8_t ad_len;

	/* Get common pointers from reference to previous tertiary PDU data */
	ter_com_hdr_prev = (void *)&ter_pdu_prev->adv_ext_ind;
	ter_hdr = (void *)ter_com_hdr_prev->ext_hdr_adv_data;
	ter_hdr_prev = *ter_hdr;
	ter_dptr_prev = ter_hdr->data;

	/* Set common fields in reference to new tertiary PDU data buffer */
	ter_pdu->type = ter_pdu_prev->type;
	ter_pdu->rfu = 0U;
	ter_pdu->chan_sel = 0U;

	ter_pdu->tx_addr = ter_pdu_prev->tx_addr;
	ter_pdu->rx_addr = ter_pdu_prev->rx_addr;

	ter_com_hdr = (void *)&ter_pdu->adv_ext_ind;
	ter_com_hdr->adv_mode = ter_com_hdr_prev->adv_mode;
	ter_hdr = (void *)ter_com_hdr->ext_hdr_adv_data;
	ter_dptr = ter_hdr->data;
	*(uint8_t *)ter_hdr = 0U;

	/* No AdvA in AUX_SYNC_IND */
	/* No TargetA in AUX_SYNC_IND */

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	/* If requested add or update CTEInfo */
	if (hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) {
		ter_hdr->cte_info = 1;
		cte_info = *(uint8_t *)value;
		value = (uint8_t *)value + 1;
		ter_dptr += sizeof(struct pdu_cte_info);
	/* If CTEInfo exists in prev and is not requested to be removed */
	} else if (!(hdr_rem_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) &&
		   ter_hdr_prev.cte_info) {
		ter_hdr->cte_info = 1;
		ter_dptr += sizeof(struct pdu_cte_info);
	}

	/* If CTEInfo exists in prev PDU */
	if (ter_hdr_prev.cte_info) {
		ter_dptr_prev += sizeof(struct pdu_cte_info);
	}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

	/* No ADI in AUX_SYNC_IND */

	/* AuxPtr - will be added if AUX_CHAIN_IND is required */
	if ((hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_AUX_PTR) ||
	    (!(hdr_rem_fields & ULL_ADV_PDU_HDR_FIELD_AUX_PTR) &&
	     ter_hdr_prev.aux_ptr)) {
		ter_hdr->aux_ptr = 1;
	}
	if (ter_hdr->aux_ptr) {
		ter_dptr += sizeof(struct pdu_adv_aux_ptr);
	}
	if (ter_hdr_prev.aux_ptr) {
		ter_dptr_prev += sizeof(struct pdu_adv_aux_ptr);
	}

	/* No SyncInfo in AUX_SYNC_IND */

	/* Tx Power flag */
	if (ter_hdr_prev.tx_pwr) {
		ter_dptr_prev++;

		ter_hdr->tx_pwr = 1;
		ter_dptr++;
	}

	/* Calc previous ACAD len and update PDU len */
	ter_len_prev = ter_dptr_prev - (uint8_t *)ter_com_hdr_prev;
	hdr_buf_len = ter_com_hdr_prev->ext_hdr_len +
		      PDU_AC_EXT_HEADER_SIZE_MIN;
	if (ter_len_prev <= hdr_buf_len) {
		acad_len_prev = hdr_buf_len - ter_len_prev;
		ter_len_prev += acad_len_prev;
		ter_dptr_prev += acad_len_prev;
		ter_dptr += acad_len_prev;
	} else {
		acad_len_prev = 0;
		/* NOTE: If no flags are set then extended header length will be
		 *       zero. Under this condition the current ter_len_prev
		 *       value will be greater than extended header length,
		 *       hence set ter_len_prev to size of the length/mode
		 *       field.
		 */
		ter_len_prev = PDU_AC_EXT_HEADER_SIZE_MIN;
		ter_dptr_prev = (uint8_t *)ter_com_hdr_prev + ter_len_prev;
	}

	/* Did we parse beyond PDU length? */
	if (ter_len_prev > ter_pdu_prev->len) {
		/* we should not encounter invalid length */
		return BT_HCI_ERR_UNSPECIFIED;
	}

	/* Calc current tertiary PDU len */
	ter_len = ull_adv_aux_hdr_len_calc(ter_com_hdr, &ter_dptr);
	ull_adv_aux_hdr_len_fill(ter_com_hdr, ter_len);

	/* Get Adv data from function parameters */
	if (hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_AD_DATA) {
		ad_data = value;
		ad_len = *ad_data;
		++ad_data;

		ad_data = (void *)sys_get_le32(ad_data);
	} else if (!(hdr_rem_fields & ULL_ADV_PDU_HDR_FIELD_AD_DATA)) {
		ad_len = ter_pdu_prev->len - ter_len_prev;
		ad_data = ter_dptr_prev;
	} else {
		ad_len = 0;
		ad_data = NULL;
	}

	/* Add AD len to tertiary PDU length */
	ter_len += ad_len;

	/* Check AdvData overflow */
	if (ter_len > PDU_AC_PAYLOAD_SIZE_MAX) {
		return BT_HCI_ERR_PACKET_TOO_LONG;
	}

	/* set the secondary PDU len */
	ter_pdu->len = ter_len;

	/* Start filling tertiary PDU payload based on flags from here
	 * ==============================================================
	 */

	/* Fill AdvData in tertiary PDU */
	memmove(ter_dptr, ad_data, ad_len);

	/* Fill ACAD in tertiary PDU */
	ter_dptr_prev -= acad_len_prev;
	ter_dptr -= acad_len_prev;
	memmove(ter_dptr, ter_dptr_prev, acad_len_prev);

	/* Tx Power */
	if (ter_hdr->tx_pwr) {
		*--ter_dptr = *--ter_dptr_prev;
	}

	/* No SyncInfo in AUX_SYNC_IND */

	/* AuxPtr */
	if (ter_hdr->aux_ptr) {
		/* ToDo Update setup of aux_ptr - check documentation */
		if (ter_hdr_prev.aux_ptr) {
			ter_dptr_prev -= sizeof(struct pdu_adv_aux_ptr);
			ter_dptr -= sizeof(struct pdu_adv_aux_ptr);
			memmove(ter_dptr, ter_dptr_prev,
				sizeof(struct pdu_adv_aux_ptr));
		} else {
			ull_adv_aux_ptr_fill(&ter_dptr, lll_sync->adv->phy_s);
		}
	}

	/* No ADI in AUX_SYNC_IND*/

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
	if (ter_hdr->cte_info) {
		if (hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) {
			*--ter_dptr = cte_info;
		} else {
			*--ter_dptr = *--ter_dptr_prev;
		}
	}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

	/* No TargetA in AUX_SYNC_IND */
	/* No AdvA in AUX_SYNC_IND */

	return 0;
}

#if defined(CONFIG_BT_CTLR_DF_ADV_CTE_TX)
/* @brief Set or clear fields in extended advertising header and store
 *        extra_data if requested.
 *
 * @param[in]  extra_data_prev  Pointer to previous content of extra_data.
 * @param[in]  hdr_add_fields   Flag with information which fields add.
 * @param[in]  hdr_rem_fields   Flag with information which fields remove.
 * @param[in]  data             Pointer to data to be stored in extra_data.
 *                              Content depends on the data depends on
 *                              @p hdr_add_fields.
 *
 * @Note
 * @p data depends on the flag provided by @p hdr_add_fields.
 * Information about content of value may be found in description of
 * @ref ull_adv_sync_pdu_set_clear.
 *
 * @return Zero in case of success, other value in case of failure.
 */
static inline void adv_sync_extra_data_set_clear(void *extra_data_prev,
						 void *extra_data_new,
						 uint16_t hdr_add_fields,
						 uint16_t hdr_rem_fields,
						 void *data)
{
	/* Currently only CTE enable requires extra_data. Due to that fact
	 * CTE additional data are just copied to extra_data memory.
	 */
	if (hdr_add_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) {
		memcpy(extra_data_new, data, sizeof(struct lll_df_adv_cfg));
	} else if ((hdr_rem_fields & ULL_ADV_PDU_HDR_FIELD_CTE_INFO) ||
		    extra_data_prev) {
		memmove(extra_data_new, extra_data_prev,
			sizeof(struct lll_df_adv_cfg));
	}
}
#endif /* CONFIG_BT_CTLR_DF_ADV_CTE_TX */

static void mfy_sync_offset_get(void *param)
{
	struct ll_adv_set *adv = param;
	struct lll_adv_sync *lll_sync;
	struct ll_adv_sync_set *sync;
	struct pdu_adv_sync_info *si;
	uint32_t ticks_to_expire;
	uint32_t ticks_current;
	struct pdu_adv *pdu;
	uint8_t ticker_id;
	uint16_t lazy;
	uint8_t retry;
	uint8_t id;

	lll_sync = adv->lll.sync;
	sync = (void *)HDR_LLL2EVT(lll_sync);
	ticker_id = TICKER_ID_ADV_SYNC_BASE + sync_handle_get(sync);

	id = TICKER_NULL;
	ticks_to_expire = 0U;
	ticks_current = 0U;
	retry = 4U;
	do {
		uint32_t volatile ret_cb;
		uint32_t ticks_previous;
		uint32_t ret;

		ticks_previous = ticks_current;

		ret_cb = TICKER_STATUS_BUSY;
		ret = ticker_next_slot_get_ext(TICKER_INSTANCE_ID_CTLR,
					       TICKER_USER_ID_ULL_LOW,
					       &id, &ticks_current,
					       &ticks_to_expire, &lazy,
					       ticker_op_cb, (void *)&ret_cb);
		if (ret == TICKER_STATUS_BUSY) {
			while (ret_cb == TICKER_STATUS_BUSY) {
				ticker_job_sched(TICKER_INSTANCE_ID_CTLR,
						 TICKER_USER_ID_ULL_LOW);
			}
		}

		LL_ASSERT(ret_cb == TICKER_STATUS_SUCCESS);

		LL_ASSERT((ticks_current == ticks_previous) || retry--);

		LL_ASSERT(id != TICKER_NULL);
	} while (id != ticker_id);

	/* NOTE: as remainder not used in scheduling primary PDU
	 * packet timer starts transmission after 1 tick hence the +1.
	 */
	lll_sync->ticks_offset = ticks_to_expire + 1;

	pdu = lll_adv_aux_data_curr_get(adv->lll.aux);
	si = sync_info_get(pdu);
	sync_info_offset_fill(si, ticks_to_expire, 0);
	si->evt_cntr = lll_sync->event_counter + lll_sync->latency_prepare +
		       lazy;
}

static inline struct pdu_adv_sync_info *sync_info_get(struct pdu_adv *pdu)
{
	struct pdu_adv_com_ext_adv *p;
	struct pdu_adv_ext_hdr *h;
	uint8_t *ptr;

	p = (void *)&pdu->adv_ext_ind;
	h = (void *)p->ext_hdr_adv_data;
	ptr = h->data;

	if (h->adv_addr) {
		ptr += BDADDR_SIZE;
	}

	if (h->adi) {
		ptr += sizeof(struct pdu_adv_adi);
	}

	if (h->aux_ptr) {
		ptr += sizeof(struct pdu_adv_aux_ptr);
	}

	return (void *)ptr;
}

static inline void sync_info_offset_fill(struct pdu_adv_sync_info *si,
					 uint32_t ticks_offset,
					 uint32_t start_us)
{
	uint32_t offs;

	offs = HAL_TICKER_TICKS_TO_US(ticks_offset) - start_us;
	offs = offs / OFFS_UNIT_30_US;
	if (!!(offs >> 13)) {
		si->offs = offs / (OFFS_UNIT_300_US / OFFS_UNIT_30_US);
		si->offs_units = 1U;
	} else {
		si->offs = offs;
		si->offs_units = 0U;
	}
}

static void ticker_cb(uint32_t ticks_at_expire, uint32_t remainder,
		      uint16_t lazy, void *param)
{
	static memq_link_t link;
	static struct mayfly mfy = {0, 0, &link, NULL, lll_adv_sync_prepare};
	static struct lll_prepare_param p;
	struct ll_adv_sync_set *sync = param;
	struct lll_adv_sync *lll;
	uint32_t ret;
	uint8_t ref;

	DEBUG_RADIO_PREPARE_A(1);

	lll = &sync->lll;

	/* Increment prepare reference count */
	ref = ull_ref_inc(&sync->ull);
	LL_ASSERT(ref);

	/* Append timing parameters */
	p.ticks_at_expire = ticks_at_expire;
	p.remainder = remainder;
	p.lazy = lazy;
	p.param = lll;
	mfy.param = &p;

	/* Kick LLL prepare */
	ret = mayfly_enqueue(TICKER_USER_ID_ULL_HIGH,
			     TICKER_USER_ID_LLL, 0, &mfy);
	LL_ASSERT(!ret);

	DEBUG_RADIO_PREPARE_A(1);
}

static void ticker_op_cb(uint32_t status, void *param)
{
	*((uint32_t volatile *)param) = status;
}