subsys/bluetooth/controller/ll_sw/nordic/lll/lll_sync_iso.c

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdint.h>

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

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

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

#include "pdu.h"

#include "lll.h"
#include "lll_vendor.h"
#include "lll_clock.h"
#include "lll_chan.h"
#include "lll_sync_iso.h"

#include "lll_internal.h"
#include "lll_tim_internal.h"

#include "ll_feat.h"

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

static int init_reset(void);
static void prepare(void *param);
static void create_prepare_bh(void *param);
static void prepare_bh(void *param);
static int create_prepare_cb(struct lll_prepare_param *p);
static int prepare_cb(struct lll_prepare_param *p);
static int prepare_cb_common(struct lll_prepare_param *p);
static void abort_cb(struct lll_prepare_param *prepare_param, void *param);
static void isr_rx_estab(void *param);
static void isr_rx(void *param);
static void isr_rx_iso_data_valid(const struct lll_sync_iso *const lll,
				  uint8_t bis_idx, struct node_rx_pdu *node_rx);
static void isr_rx_iso_data_invalid(const struct lll_sync_iso *const lll,
				    uint8_t bis_idx, uint8_t bn,
				    struct node_rx_pdu *node_rx);
static void isr_rx_ctrl_recv(struct lll_sync_iso *lll, struct pdu_bis *pdu);

/* FIXME: Optimize by moving to a common place, as similar variable is used for
 *        connections too.
 */
static uint8_t trx_cnt;
static uint8_t crc_ok_anchor;

int lll_sync_iso_init(void)
{
	int err;

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

	return 0;
}

int lll_sync_iso_reset(void)
{
	int err;

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

	return 0;
}

void lll_sync_iso_create_prepare(void *param)
{
	prepare(param);
	create_prepare_bh(param);
}

void lll_sync_iso_prepare(void *param)
{
	prepare(param);
	prepare_bh(param);
}

static int init_reset(void)
{
	return 0;
}

static void prepare(void *param)
{
	struct lll_prepare_param *p;
	struct lll_sync_iso *lll;
	uint16_t elapsed;
	int err;

	err = lll_hfclock_on();
	LL_ASSERT(err >= 0);

	p = param;

	/* Instants elapsed */
	elapsed = p->lazy + 1U;

	lll = p->param;

	/* Save the (latency + 1) for use in event */
	lll->latency_prepare += elapsed;

	/* Accumulate window widening */
	lll->window_widening_prepare_us += lll->window_widening_periodic_us *
					   elapsed;
	if (lll->window_widening_prepare_us > lll->window_widening_max_us) {
		lll->window_widening_prepare_us = lll->window_widening_max_us;
	}
}

static void create_prepare_bh(void *param)
{
	int err;

	/* Invoke common pipeline handling of prepare */
	err = lll_prepare(lll_is_abort_cb, abort_cb, create_prepare_cb, 0U,
			  param);
	LL_ASSERT(!err || err == -EINPROGRESS);
}

static void prepare_bh(void *param)
{
	int err;

	/* Invoke common pipeline handling of prepare */
	err = lll_prepare(lll_is_abort_cb, abort_cb, prepare_cb, 0U, param);
	LL_ASSERT(!err || err == -EINPROGRESS);
}

static int create_prepare_cb(struct lll_prepare_param *p)
{
	int err;

	err = prepare_cb_common(p);
	if (err) {
		DEBUG_RADIO_START_O(1);
		return 0;
	}

	radio_isr_set(isr_rx_estab, p->param);

	DEBUG_RADIO_START_O(1);
	return 0;
}

static int prepare_cb(struct lll_prepare_param *p)
{
	int err;

	err = prepare_cb_common(p);
	if (err) {
		DEBUG_RADIO_START_O(1);
		return 0;
	}

	radio_isr_set(isr_rx, p->param);

	DEBUG_RADIO_START_O(1);
	return 0;
}

static int prepare_cb_common(struct lll_prepare_param *p)
{
	struct node_rx_pdu *node_rx;
	struct lll_sync_iso *lll;
	uint32_t ticks_at_event;
	uint32_t ticks_at_start;
	uint16_t event_counter;
	uint8_t access_addr[4];
	uint16_t data_chan_id;
	uint8_t data_chan_use;
	uint32_t remainder_us;
	uint8_t crc_init[3];
	struct ull_hdr *ull;
	uint32_t remainder;
	uint32_t hcto;
	uint8_t phy;

	DEBUG_RADIO_START_O(1);

	lll = p->param;

	/* Deduce the latency */
	lll->latency_event = lll->latency_prepare - 1U;

	/* Calculate the current event counter value */
	event_counter = (lll->payload_count / lll->bn) + lll->latency_event;

	/* Update BIS packet counter to next value */
	lll->payload_count += (lll->latency_prepare * lll->bn);

	/* Reset accumulated latencies */
	lll->latency_prepare = 0U;

	/* Current window widening */
	lll->window_widening_event_us += lll->window_widening_prepare_us;
	lll->window_widening_prepare_us = 0U;
	if (lll->window_widening_event_us > lll->window_widening_max_us) {
		lll->window_widening_event_us =	lll->window_widening_max_us;
	}

	/* Initialize to mandatory parameter values */
	lll->bis_curr = 1U;
	lll->ptc_curr = 0U;
	lll->irc_curr = 1U;
	lll->bn_curr = 1U;

	/* Initialize control subevent flag */
	lll->ctrl = 0U;

	/* Initialize stream current */
	lll->stream_curr = 0U;

	/* Initialize trx chain count */
	trx_cnt = 0U;

	/* Initialize anchor point CRC ok flag */
	crc_ok_anchor = 0U;

	/* Calculate the Access Address for the BIS event */
	util_bis_aa_le32(lll->bis_curr, lll->seed_access_addr, access_addr);
	data_chan_id = lll_chan_id(access_addr);

	/* Calculate the CRC init value for the BIS event,
	 * preset with the BaseCRCInit value from the BIGInfo data the most
	 * significant 2 octets and the BIS_Number for the specific BIS in the
	 * least significant octet.
	 */
	crc_init[0] = lll->bis_curr;
	(void)memcpy(&crc_init[1], lll->base_crc_init, sizeof(uint16_t));

	/* Calculate the radio channel to use for ISO event */
	data_chan_use = lll_chan_iso_event(event_counter, data_chan_id,
					   lll->data_chan_map,
					   lll->data_chan_count,
					   &lll->data_chan_prn_s,
					   &lll->data_chan_remap_idx);
	lll->ctrl_chan_use = data_chan_use;

	/* Start setting up of Radio h/w */
	radio_reset();

#if defined(CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL)
	radio_tx_power_set(lll->tx_pwr_lvl);
#else
	radio_tx_power_set(RADIO_TXP_DEFAULT);
#endif

	phy = lll->phy;
	radio_phy_set(phy, PHY_FLAGS_S8);
	radio_pkt_configure(RADIO_PKT_CONF_LENGTH_8BIT, lll->max_pdu,
			    RADIO_PKT_CONF_PHY(phy));
	radio_aa_set(access_addr);
	radio_crc_configure(PDU_CRC_POLYNOMIAL, sys_get_le24(crc_init));
	lll_chan_set(data_chan_use);

	node_rx = ull_iso_pdu_rx_alloc_peek(1U);
	LL_ASSERT(node_rx);
	radio_pkt_rx_set(node_rx->pdu);

	radio_switch_complete_and_disable();

	ticks_at_event = p->ticks_at_expire;
	ull = HDR_LLL2ULL(lll);
	ticks_at_event += lll_event_offset_get(ull);

	ticks_at_start = ticks_at_event;
	ticks_at_start += HAL_TICKER_US_TO_TICKS(EVENT_OVERHEAD_START_US);

	remainder = p->remainder;
	remainder_us = radio_tmr_start(0U, ticks_at_start, remainder);

	radio_tmr_ready_save(remainder_us);
	radio_tmr_aa_save(0U);
	radio_tmr_aa_capture();

	hcto = remainder_us +
	       ((EVENT_JITTER_US + EVENT_TICKER_RES_MARGIN_US +
		 lll->window_widening_event_us) << 1) +
	       lll->window_size_event_us;
	hcto += radio_rx_ready_delay_get(lll->phy, PHY_FLAGS_S8);
	hcto += addr_us_get(lll->phy);
	hcto += radio_rx_chain_delay_get(lll->phy, PHY_FLAGS_S8);
	radio_tmr_hcto_configure(hcto);

	radio_tmr_end_capture();
	radio_rssi_measure();

#if defined(HAL_RADIO_GPIO_HAVE_LNA_PIN)
	radio_gpio_lna_setup();

	radio_gpio_pa_lna_enable(remainder_us +
				 radio_rx_ready_delay_get(lll->phy, PHY_FLAGS_S8) -
				 HAL_RADIO_GPIO_LNA_OFFSET);
#endif /* HAL_RADIO_GPIO_HAVE_LNA_PIN */

	if (0) {
#if defined(CONFIG_BT_CTLR_XTAL_ADVANCED) && \
	(EVENT_OVERHEAD_PREEMPT_US <= EVENT_OVERHEAD_PREEMPT_MIN_US)
	/* check if preempt to start has changed */
	} else if (lll_preempt_calc(ull, (TICKER_ID_SCAN_SYNC_ISO_BASE +
					  ull_sync_iso_lll_handle_get(lll)),
				    ticks_at_event)) {
		radio_isr_set(lll_isr_abort, lll);
		radio_disable();

		return -ECANCELED;
#endif /* CONFIG_BT_CTLR_XTAL_ADVANCED */
	} else {
		uint32_t ret;

		ret = lll_prepare_done(lll);
		LL_ASSERT(!ret);
	}

	return 0;
}

static void abort_cb(struct lll_prepare_param *prepare_param, void *param)
{
	struct event_done_extra *e;
	int err;

	/* NOTE: This is not a prepare being cancelled */
	if (!prepare_param) {
		radio_isr_set(lll_isr_done, param);
		radio_disable();
		return;
	}

	/* NOTE: Else clean the top half preparations of the aborted event
	 * currently in preparation pipeline.
	 */
	err = lll_hfclock_off();
	LL_ASSERT(err >= 0);

	/* Extra done event, to check sync lost */
	e = ull_event_done_extra_get();
	LL_ASSERT(e);

	e->type = EVENT_DONE_EXTRA_TYPE_SYNC_ISO;
	e->trx_cnt = 0U;
	e->crc_valid = 0U;

	lll_done(param);
}

static void isr_rx_estab(void *param)
{
	struct event_done_extra *e;
	uint8_t trx_done;
	uint8_t crc_ok;

	/* Read radio status and events */
	trx_done = radio_is_done();
	if (trx_done) {
		crc_ok = radio_crc_is_valid();
		trx_cnt++;
	} else {
		crc_ok = 0U;
	}

	/* Clear radio rx status and events */
	lll_isr_rx_status_reset();

	/* Calculate and place the drift information in done event */
	e = ull_event_done_extra_get();
	LL_ASSERT(e);

	e->type = EVENT_DONE_EXTRA_TYPE_SYNC_ISO_ESTAB;
	e->trx_cnt = trx_cnt;
	e->crc_valid = crc_ok;

	if (trx_cnt) {
		struct lll_sync_iso *lll;

		lll = param;
		e->drift.preamble_to_addr_us = addr_us_get(lll->phy);
		e->drift.start_to_address_actual_us =
			radio_tmr_aa_get() - radio_tmr_ready_get();
		e->drift.window_widening_event_us =
			lll->window_widening_event_us;

		/* Reset window widening, as anchor point sync-ed */
		lll->window_widening_event_us = 0U;
		lll->window_size_event_us = 0U;
	}

	lll_isr_cleanup(param);
}

static void isr_rx(void *param)
{
	struct node_rx_pdu *node_rx;
	struct event_done_extra *e;
	struct lll_sync_iso *lll;
	uint8_t access_addr[4];
	uint16_t data_chan_id;
	uint8_t data_chan_use;
	uint8_t payload_index;
	uint8_t crc_init[3];
	uint8_t rssi_ready;
	uint32_t start_us;
	uint8_t new_burst;
	uint8_t trx_done;
	uint8_t bis_idx;
	uint8_t skipped;
	uint8_t crc_ok;
	uint32_t hcto;
	uint8_t bis;
	uint8_t nse;
	uint8_t bn;

	/* Read radio status and events */
	trx_done = radio_is_done();
	if (!trx_done) {
		/* Clear radio rx status and events */
		lll_isr_rx_status_reset();

		/* initialize LLL context reference */
		lll = param;

		/* BIS index */
		bis_idx = lll->bis_curr - 1U;

		goto isr_rx_done;
	}

	crc_ok = radio_crc_is_valid();
	rssi_ready = radio_rssi_is_ready();
	trx_cnt++;

	/* Save the AA captured for the first anchor point sync */
	if (!radio_tmr_aa_restore()) {
		crc_ok_anchor = crc_ok;
		radio_tmr_aa_save(radio_tmr_aa_get());
		radio_tmr_ready_save(radio_tmr_ready_get());
	}

	/* Clear radio rx status and events */
	lll_isr_rx_status_reset();

	/* initialize LLL context reference */
	lll = param;

	/* BIS index */
	bis_idx = lll->bis_curr - 1U;

	/* Check CRC and generate ISO Data PDU */
	if (crc_ok) {
		struct lll_sync_iso_stream *stream;
		struct pdu_bis *pdu;
		uint16_t handle;

		/* Check if Control Subevent being received */
		if ((lll->bn_curr == lll->bn) &&
		    (lll->irc_curr == lll->irc) &&
		    (lll->ptc_curr == lll->ptc) &&
		    (lll->bis_curr == lll->num_bis) &&
		    lll->ctrl) {
			lll->cssn_curr = lll->cssn_next;

			node_rx = ull_iso_pdu_rx_alloc_peek(1U);
			LL_ASSERT(node_rx);

			pdu = (void *)node_rx->pdu;
			if (pdu->ll_id != PDU_BIS_LLID_CTRL) {
				goto isr_rx_done;
			}

			isr_rx_ctrl_recv(lll, pdu);
		} else {
			/* check if there are 2 free rx buffers, one will be
			 * consumed to receive the current PDU, and the other
			 * is to ensure a PDU can be setup for the radio DMA to
			 * receive in the next sub_interval/iso_interval.
			 */
			node_rx = ull_iso_pdu_rx_alloc_peek(2U);
			if (!node_rx) {
				goto isr_rx_done;
			}
		}

		pdu = (void *)node_rx->pdu;

		/* Check for new control PDU in control subevent */
		if (pdu->cstf && (pdu->cssn != lll->cssn_curr)) {
			lll->cssn_next = pdu->cssn;
			/* TODO: check same CSSN is used in every subevent */
		}

		/* calculate the payload index in the sliding window */
		payload_index = lll->payload_tail + (lll->bn_curr - 1U) +
				(lll->ptc_curr * lll->pto);
		if (payload_index >= lll->payload_count_max) {
			payload_index -= lll->payload_count_max;
		}

		handle = lll->stream_handle[lll->stream_curr];
		stream = ull_sync_iso_lll_stream_get(handle);

		if ((lll->bis_curr == stream->bis_index) && pdu->len &&
		    !lll->payload[bis_idx][payload_index] &&
		    ((payload_index >= lll->payload_tail) ||
		     (payload_index < lll->payload_head))) {
			ull_iso_pdu_rx_alloc();
			isr_rx_iso_data_valid(lll, bis_idx, node_rx);

			lll->payload[bis_idx][payload_index] = node_rx;
		}
	}

isr_rx_done:
	new_burst = 0U;
	skipped = 0U;

isr_rx_find_subevent:
	/* FIXME: Sequential or Interleaved BIS subevents decision */
	/* Sequential Rx complete flow pseudo code */
	while (lll->bn_curr < lll->bn) {
		lll->bn_curr++;

		payload_index = lll->payload_tail + (lll->bn_curr - 1U);
		if (payload_index >= lll->payload_count_max) {
			payload_index -= lll->payload_count_max;
		}

		if (!lll->payload[bis_idx][payload_index]) {
			bis = lll->bis_curr;

			/* Receive the (bn_curr)th Rx PDU of bis_curr */
			goto isr_rx_next_subevent;
		}

		skipped++;
	}

	if (lll->irc_curr < lll->irc) {
		if (!new_burst) {
			lll->bn_curr = 1U;
			lll->irc_curr++;

			payload_index = lll->payload_tail;
			if (payload_index >= lll->payload_count_max) {
				payload_index -= lll->payload_count_max;
			}

			if (!lll->payload[bis_idx][payload_index]) {
				bis = lll->bis_curr;

				goto isr_rx_next_subevent;
			} else {
				skipped++;
				new_burst = 1U;

				/* Receive the missing (bn_curr)th Rx PDU of
				 * bis_curr
				 */
				goto isr_rx_find_subevent;
			}
		} else {
			skipped += (lll->irc - lll->irc_curr) * lll->bn;
			lll->irc_curr = lll->irc;
		}
	}

	if (lll->ptc_curr < lll->ptc) {
		lll->ptc_curr++;
		/* Receive the (ptc_curr)th Rx PDU */

		bis = lll->bis_curr;

		goto isr_rx_next_subevent;
	}

	if (lll->bis_curr < lll->num_bis) {
		struct lll_sync_iso_stream *stream;
		uint16_t handle;

		if (skipped) {
			/* Calculate the Access Address for the current BIS */
			util_bis_aa_le32(lll->bis_curr, lll->seed_access_addr,
					 access_addr);
			data_chan_id = lll_chan_id(access_addr);

			/* Skip channel indices for the previous BIS stream */
			do {
				/* Calculate the radio channel to use for ISO event */
				(void)lll_chan_iso_subevent(data_chan_id,
						lll->data_chan_map,
						lll->data_chan_count,
						&lll->data_chan_prn_s,
						&lll->data_chan_remap_idx);
			} while (--skipped);
		}

		handle = lll->stream_handle[lll->stream_curr];
		stream = ull_sync_iso_lll_stream_get(handle);
		if (lll->bis_curr == stream->bis_index) {
			const uint8_t stream_curr = lll->stream_curr + 1U;

			if (stream_curr < lll->stream_count) {
				lll->stream_curr = stream_curr;
			}
		}

		lll->bis_curr++;
		lll->ptc_curr = 0U;
		lll->irc_curr = 1U;
		lll->bn_curr = 1U;

		/* Receive the (bn_curr)th PDU of bis_curr */
		bis = lll->bis_curr;

		goto isr_rx_next_subevent;
	}

	if (!lll->ctrl && (lll->cssn_next != lll->cssn_curr)) {
		/* Receive the control PDU and close the BIG event
		 *  there after.
		 */
		lll->ctrl = 1U;

		/* control subevent to use bis = 0 and se_n = 1 */
		bis = 0U;

		goto isr_rx_next_subevent;
	}

	/* Enqueue PDUs to ULL */
	node_rx = NULL;
	lll->stream_curr = 0U;
	payload_index = lll->payload_tail;
	for (bis_idx = 0U; bis_idx < lll->num_bis; bis_idx++) {
		struct lll_sync_iso_stream *stream;
		uint8_t payload_tail;
		uint8_t stream_curr;
		uint16_t handle;

		handle = lll->stream_handle[lll->stream_curr];
		stream = ull_sync_iso_lll_stream_get(handle);
		/* Skip BIS indices not synchronized. bis_index is 0x01 to 0x1F,
		 * where as bis_idx is 0 indexed.
		 */
		if ((bis_idx + 1U) != stream->bis_index) {
			continue;
		}

		payload_tail = lll->payload_tail;
		bn = lll->bn;
		while (bn--) {
			if (lll->payload[bis_idx][payload_tail]) {
				node_rx =
					lll->payload[bis_idx][payload_tail];
				lll->payload[bis_idx][payload_tail] = NULL;

				iso_rx_put(node_rx->hdr.link, node_rx);
			} else {
				/* check if there are 2 free rx buffers, one
				 * will be consumed to generate PDU with invalid
				 * status, and the other is to ensure a PDU can
				 * be setup for the radio DMA to receive in the
				 * next sub_interval/iso_interval.
				 */
				node_rx = ull_iso_pdu_rx_alloc_peek(2U);
				if (node_rx) {
					struct pdu_bis *pdu;

					ull_iso_pdu_rx_alloc();

					pdu = (void *)node_rx->pdu;
					pdu->ll_id = PDU_BIS_LLID_COMPLETE_END;
					pdu->len = 0U;

					isr_rx_iso_data_invalid(lll, bis_idx,
								bn, node_rx);

					iso_rx_put(node_rx->hdr.link, node_rx);
				}
			}

			payload_index = payload_tail + 1U;
			if (payload_index >= lll->payload_count_max) {
				payload_index = 0U;
			}
			payload_tail = payload_index;
		}

		stream_curr = lll->stream_curr + 1U;
		if (stream_curr < lll->stream_count) {
			lll->stream_curr = stream_curr;
		}
	}
	lll->payload_tail = payload_index;

#if !defined(CONFIG_BT_CTLR_LOW_LAT_ULL)
	if (node_rx) {
		iso_rx_sched();
	}
#endif /* CONFIG_BT_CTLR_LOW_LAT_ULL */

	e = ull_event_done_extra_get();
	LL_ASSERT(e);

	/* Check if BIG terminate procedure received */
	if (lll->term_reason) {
		e->type = EVENT_DONE_EXTRA_TYPE_SYNC_ISO_TERMINATE;

		lll_isr_cleanup(param);

		return;

	/* Check if BIG Channel Map Update */
	} else if (lll->chm_chan_count) {
		const uint16_t event_counter = lll->payload_count / lll->bn;

		/* Bluetooth Core Specification v5.3 Vol 6, Part B,
		 * Section 5.5.2 BIG Control Procedures
		 *
		 * When a Synchronized Receiver receives such a PDU where
		 * (instant - bigEventCounter) mod 65536 is greater than or
		 * equal to 32767 (because the instant is in the past), the
		 * the Link Layer may stop synchronization with the BIG.
		 */

		/* Note: We are not validating whether the control PDU was
		 * received after the instant but apply the new channel map.
		 * If the channel map was new at or after the instant and the
		 * the channel at the event counter did not match then the
		 * control PDU would not have been received.
		 */
		if (((event_counter - lll->ctrl_instant) & 0xFFFF) <= 0x7FFF) {
			(void)memcpy(lll->data_chan_map, lll->chm_chan_map,
				     sizeof(lll->data_chan_map));
			lll->data_chan_count = lll->chm_chan_count;
			lll->chm_chan_count = 0U;
		}
	}

	/* Calculate and place the drift information in done event */
	e->type = EVENT_DONE_EXTRA_TYPE_SYNC_ISO;
	e->trx_cnt = trx_cnt;
	e->crc_valid = crc_ok_anchor;

	if (trx_cnt) {
		e->drift.preamble_to_addr_us = addr_us_get(lll->phy);
		e->drift.start_to_address_actual_us =
			radio_tmr_aa_restore() - radio_tmr_ready_restore();
		e->drift.window_widening_event_us =
			lll->window_widening_event_us;

		/* Reset window widening, as anchor point sync-ed */
		lll->window_widening_event_us = 0U;
		lll->window_size_event_us = 0U;
	}

	lll_isr_cleanup(param);
	return;

isr_rx_next_subevent:
	/* Calculate the Access Address for the BIS event */
	util_bis_aa_le32(bis, lll->seed_access_addr, access_addr);
	data_chan_id = lll_chan_id(access_addr);

	/* Calculate the CRC init value for the BIS event,
	 * preset with the BaseCRCInit value from the BIGInfo data the most
	 * significant 2 octets and the BIS_Number for the specific BIS in the
	 * least significant octet.
	 */
	crc_init[0] = bis;
	(void)memcpy(&crc_init[1], lll->base_crc_init, sizeof(uint16_t));

	radio_aa_set(access_addr);
	radio_crc_configure(PDU_CRC_POLYNOMIAL, sys_get_le24(crc_init));

	/* Set the channel to use */
	if (bis) {
		do {
			/* Calculate the radio channel to use for ISO event */
			data_chan_use = lll_chan_iso_subevent(data_chan_id,
						lll->data_chan_map,
						lll->data_chan_count,
						&lll->data_chan_prn_s,
						&lll->data_chan_remap_idx);
		} while (skipped--);
	} else {
		data_chan_use = lll->ctrl_chan_use;
	}
	lll_chan_set(data_chan_use);

	node_rx = ull_iso_pdu_rx_alloc_peek(1U);
	LL_ASSERT(node_rx);
	radio_pkt_rx_set(node_rx->pdu);

	radio_switch_complete_and_disable();

	/* PDU Header Complete TimeOut, calculate the absolute timeout in
	 * microseconds by when a PDU header is to be received for each
	 * subevent.
	 */
	nse = ((lll->bis_curr - 1U) * ((lll->bn * lll->irc) + lll->ptc)) +
	      ((lll->irc_curr - 1U) * lll->bn) + (lll->bn_curr - 1U) +
	      lll->ptc_curr + lll->ctrl;
	hcto = lll->sub_interval * nse;

	if (trx_cnt) {
		/* Setup radio packet timer header complete timeout for
		 * subsequent subevent PDU.
		 */

		/* Calculate the radio start with consideration of the drift
		 * based on the access address capture timestamp.
		 * Listen early considering +/- 2 us active clock jitter, i.e.
		 * listen early by 4 us.
		 */
		hcto += radio_tmr_aa_restore();
		hcto -= radio_rx_chain_delay_get(lll->phy, PHY_FLAGS_S8);
		hcto -= addr_us_get(lll->phy);
		hcto -= radio_rx_ready_delay_get(lll->phy, PHY_FLAGS_S8);
		hcto -= (EVENT_CLOCK_JITTER_US << 1);

		start_us = hcto;
		hcto = radio_tmr_start_us(0U, start_us);

		/* Add 4 us + 4 us + (4 us * subevents so far), as radio
		 * was setup to listen 4 us early and subevents could have
		 * a 4 us drift each until the current subevent we are
		 * listening.
		 */
		hcto += ((EVENT_CLOCK_JITTER_US << 1) * (2U + nse)) +
			RANGE_DELAY_US + HCTO_START_DELAY_US;
	} else {
		/* First subevent PDU was not received, hence setup radio packet
		 * timer header complete timeout from where the first subevent
		 * PDU which is the BIG event anchor point would have been
		 * received.
		 */
		hcto += radio_tmr_ready_restore();

		start_us = hcto;
		hcto = radio_tmr_start_us(0U, start_us);

		hcto += ((EVENT_JITTER_US + EVENT_TICKER_RES_MARGIN_US +
			  lll->window_widening_event_us) << 1) +
			lll->window_size_event_us;
	}

	/* header complete timeout to consider the radio ready delay, chain
	 * delay and access address duration.
	 */
	hcto += radio_rx_ready_delay_get(lll->phy, PHY_FLAGS_S8);
	hcto += addr_us_get(lll->phy);
	hcto += radio_rx_chain_delay_get(lll->phy, PHY_FLAGS_S8);

	/* setup absolute PDU header reception timeout */
	radio_tmr_hcto_configure(hcto);

	/* setup capture of PDU end timestamp */
	radio_tmr_end_capture();

#if defined(HAL_RADIO_GPIO_HAVE_LNA_PIN)
	radio_gpio_lna_setup();

	radio_gpio_pa_lna_enable(start_us +
				 radio_rx_ready_delay_get(lll->phy,
							  PHY_FLAGS_S8) -
				 HAL_RADIO_GPIO_LNA_OFFSET);
#endif /* HAL_RADIO_GPIO_HAVE_LNA_PIN */
}

static void isr_rx_iso_data_valid(const struct lll_sync_iso *const lll,
				  uint8_t bis_idx, struct node_rx_pdu *node_rx)
{
	struct node_rx_iso_meta *iso_meta;

	node_rx->hdr.type = NODE_RX_TYPE_ISO_PDU;
	node_rx->hdr.handle = lll->stream_handle[bis_idx];

	iso_meta = &node_rx->hdr.rx_iso_meta;
	iso_meta->payload_number = lll->payload_count + (lll->bn_curr - 1U) +
				   (lll->ptc_curr * lll->pto) - lll->bn;
	iso_meta->timestamp = HAL_TICKER_TICKS_TO_US(radio_tmr_start_get()) +
			      radio_tmr_aa_restore() - addr_us_get(lll->phy) +
			      (ceiling_fraction(lll->ptc_curr, lll->bn) *
			       lll->iso_interval * PERIODIC_INT_UNIT_US);
	iso_meta->status = 0U;
}

static void isr_rx_iso_data_invalid(const struct lll_sync_iso *const lll,
				    uint8_t bis_idx, uint8_t bn,
				    struct node_rx_pdu *node_rx)
{
	struct node_rx_iso_meta *iso_meta;

	node_rx->hdr.type = NODE_RX_TYPE_ISO_PDU;
	node_rx->hdr.handle = lll->stream_handle[bis_idx];

	iso_meta = &node_rx->hdr.rx_iso_meta;
	iso_meta->payload_number = lll->payload_count - bn - 1U;
	iso_meta->timestamp = HAL_TICKER_TICKS_TO_US(radio_tmr_start_get()) +
			      radio_tmr_aa_restore() - addr_us_get(lll->phy);
	iso_meta->status = 1U;
}

static void isr_rx_ctrl_recv(struct lll_sync_iso *lll, struct pdu_bis *pdu)
{
	const uint8_t opcode = pdu->ctrl.opcode;

	if (opcode == PDU_BIG_CTRL_TYPE_TERM_IND) {
		if (!lll->term_reason) {
			struct pdu_big_ctrl_term_ind *term;

			term = (void *)&pdu->ctrl.term_ind;
			lll->term_reason = term->reason;
			lll->ctrl_instant = term->instant;
		}
	} else if (opcode == PDU_BIG_CTRL_TYPE_CHAN_MAP_IND) {
		if (!lll->chm_chan_count) {
			struct pdu_big_ctrl_chan_map_ind *chm;
			uint8_t chan_count;

			chm = (void *)&pdu->ctrl.chan_map_ind;
			chan_count =
				util_ones_count_get(chm->chm, sizeof(chm->chm));
			if (chan_count >= CHM_USED_COUNT_MIN) {
				lll->chm_chan_count = chan_count;
				(void)memcpy(lll->chm_chan_map, chm->chm,
					     sizeof(lll->chm_chan_map));
				lll->ctrl_instant = chm->instant;
			}
		}
	} else {
		/* Unknown control PDU, ignore */
	}
}