Bluetooth: controller: Define ULL/LLL interface for CIS central and periph

Define interface between ULL and LLL for CIS central and peripheral.

Signed-off-by: Wolfgang Puffitsch <wopu@demant.com>

subsys/bluetooth/controller/Kconfig

@@ -554,6 +554,30 @@ config BT_CTLR_PERIPHERAL_ISO
 	bool "LE Connected Isochronous Stream Peripheral [EXPERIMENTAL]" if BT_LL_SW_SPLIT
 	select BT_CTLR_SET_HOST_FEATURE
 
+config BT_CTLR_CONN_ISO_STREAMS
+	int "LE Connected Isochronous Streams"
+	depends on BT_CTLR_CENTRAL_ISO || BT_CTLR_PERIPHERAL_ISO
+	range 1 64
+	default 2
+	help
+	  Maximum supported total number of CISes.
+
+config BT_CTLR_CONN_ISO_GROUPS
+	int "LE Connected Isochronous Groups"
+	depends on BT_CTLR_CENTRAL_ISO || BT_CTLR_PERIPHERAL_ISO
+	range 1 240
+	default 1
+	help
+	  Maximum supported CIGs.
+
+config BT_CTLR_CONN_ISO_STREAMS_PER_GROUP
+	int "LE Connected Isochronous Streams per Group"
+	depends on BT_CTLR_CENTRAL_ISO || BT_CTLR_PERIPHERAL_ISO
+	range 1 31
+	default 2
+	help
+	  Maximum supported CISes per CIG.
+
 config BT_CTLR_DTM
 	bool
 	help

subsys/bluetooth/controller/ll_sw/lll.h

@@ -175,6 +175,8 @@ enum node_rx_type {
 	NODE_RX_TYPE_EVENT_DONE,
 	/* Signals arrival of RX Data Channel payload */
 	NODE_RX_TYPE_DC_PDU,
+	/* Signals arrival of isochronous payload */
+	NODE_RX_TYPE_ISO_PDU,
 	/* Advertisement report from scanning */
 	NODE_RX_TYPE_REPORT,
 	NODE_RX_TYPE_EXT_1M_REPORT,
@@ -241,6 +243,12 @@ struct node_rx_ftr {
 #endif /* CONFIG_BT_HCI_MESH_EXT */
 };
 
+/* Meta-information for isochronous PDUs in node_rx_hdr */
+struct node_rx_iso_meta {
+	uint64_t payload_number : 39; /* cisPayloadNumber */
+	uint32_t timestamp;           /* Time of reception */
+	uint8_t  status;              /* Status of reception (OK/not OK) */
+};
 
 /* Header of node_rx_pdu */
 struct node_rx_hdr {
@@ -255,10 +263,15 @@ struct node_rx_hdr {
 	uint16_t          handle;    /* State/Role instance handle */
 
 	union {
+		struct node_rx_ftr rx_ftr;
+#if defined(CONFIG_BT_CTLR_SYNC_ISO) || \
+	defined(BT_CTLR_PERIPHERAL_ISO) || \
+	defined(BT_CTLR_CENTRAL_ISO)
+		struct node_rx_iso_meta rx_iso_meta;
+#endif
 #if defined(CONFIG_BT_CTLR_RX_PDU_META)
 		lll_rx_pdu_meta_t  rx_pdu_meta;
 #endif /* CONFIG_BT_CTLR_RX_PDU_META */
-		struct node_rx_ftr rx_ftr;
 	};
 };
 
@@ -380,6 +393,9 @@ void *ull_prepare_dequeue_iter(uint8_t *idx);
 void *ull_pdu_rx_alloc_peek(uint8_t count);
 void *ull_pdu_rx_alloc_peek_iter(uint8_t *idx);
 void *ull_pdu_rx_alloc(void);
+void *ull_iso_pdu_rx_alloc_peek(uint8_t count);
+void *ull_iso_pdu_rx_alloc_peek_iter(uint8_t *idx);
+void *ull_iso_pdu_rx_alloc(void);
 void ull_rx_put(memq_link_t *link, void *rx);
 void ull_rx_sched(void);
 void *ull_event_done_extra_get(void);

subsys/bluetooth/controller/ll_sw/lll_central_iso.h

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int lll_central_iso_init(void);
+int lll_central_iso_reset(void);
+void lll_central_iso_prepare(void *param);

subsys/bluetooth/controller/ll_sw/lll_conn_iso.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+struct node_tx_iso {
+	union {
+		void        *next;
+		memq_link_t *link;
+	};
+
+	uint64_t payload_number : 39; /* cisPayloadNumber */
+	uint8_t  pdu[];
+};
+
+struct lll_conn_iso_stream_rxtx {
+	uint8_t phy;            /* PHY */
+	uint8_t burst_number;   /* Burst number (BN) */
+	uint8_t flush_timeout;  /* Flush timeout (FT) */
+	uint8_t max_octets;     /* Maximum PDU size */
+};
+
+struct lll_conn_iso_stream {
+	/* Link to ACL connection (for encryption, channel map, crc init) */
+	struct lll_conn *conn;
+
+	/* Connection parameters */
+	uint8_t  access_addr[4];    /* Access address */
+	uint32_t offset;            /* Offset of CIS from start of CIG in us */
+	uint32_t sub_interval;      /* Interval between subevents in us */
+	uint32_t subevent_length;   /* Length of subevent in us */
+	uint8_t  num_subevents;     /* Number of subevents */
+	struct lll_conn_iso_stream_rxtx rx; /* RX parameters */
+	struct lll_conn_iso_stream_rxtx tx; /* TX parameters */
+
+	/* Event and payload counters */
+	uint64_t event_count : 39;       /* cisEventCount */
+	uint64_t rx_payload_number : 39; /* cisPayloadNumber */
+
+	/* Acknowledgment and flow control */
+	uint8_t sn:1;               /* Sequence number */
+	uint8_t nesn:1;             /* Next expected sequence number */
+	uint8_t cie:1;              /* Close isochronous event */
+
+	/* Resumption information */
+	uint8_t next_subevent;      /* Next subevent to schedule */
+
+	/* Transmission queue */
+	MEMQ_DECLARE(tx);
+	memq_link_t link_tx;
+	memq_link_t *link_tx_free;
+};
+
+struct lll_conn_iso_group {
+	struct lll_hdr hdr;
+
+	uint8_t  num_cis;  /* Number of CISes in this CIG */
+#if defined(CONFIG_BT_CTLR_CONN_ISO_STREAMS_PER_GROUP)
+	struct lll_conn_iso_stream *streams
+				[CONFIG_BT_CTLR_CONN_ISO_STREAMS_PER_GROUP];
+#endif /* CONFIG_BT_CTLR_CONN_ISO_STREAMS */
+
+	/* Resumption information */
+	uint8_t  next_cis;  /* Next CIS to schedule */
+	uint32_t next_time; /* When to trigger next activity in the CIG */
+};
+
+int lll_conn_iso_init(void);
+int lll_conn_iso_reset(void);
+void lll_conn_iso_flush(uint16_t handle, struct lll_conn_iso_stream *lll);

subsys/bluetooth/controller/ll_sw/lll_peripheral_iso.h

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int lll_peripheral_iso_init(void);
+int lll_peripheral_iso_reset(void);
+void lll_peripheral_iso_prepare(void *param);