Introduce osmobts-trx, a layer 1 implementation for OpenBTS tranceivers

The code is quite complete, TCH and PDCH channels are not yet tested.

1 files changed, 121 insertions, 0 deletions

diff --git a/src/osmo-bts-trx/l1_if.h b/src/osmo-bts-trx/l1_if.h
new file mode 100644
index 00000000..7e0f3688
--- /dev/null
+++ b/src/osmo-bts-trx/l1_if.h
@@ -0,0 +1,121 @@
+#ifndef L1_IF_H_TRX
+#define L1_IF_H_TRX
+
+/* These types define the different channels on a multiframe.
+ * Each channel has queues and can be activated individually.
+ */
+enum trx_chan_type {
+	TRXC_IDLE = 0,
+	TRXC_FCCH,
+	TRXC_SCH,
+	TRXC_BCCH,
+	TRXC_RACH,
+	TRXC_CCCH,
+	TRXC_TCHF,
+	TRXC_TCHH_0,
+	TRXC_TCHH_1,
+	TRXC_SDCCH4_0,
+	TRXC_SDCCH4_1,
+	TRXC_SDCCH4_2,
+	TRXC_SDCCH4_3,
+	TRXC_SDCCH8_0,
+	TRXC_SDCCH8_1,
+	TRXC_SDCCH8_2,
+	TRXC_SDCCH8_3,
+	TRXC_SDCCH8_4,
+	TRXC_SDCCH8_5,
+	TRXC_SDCCH8_6,
+	TRXC_SDCCH8_7,
+	TRXC_SACCHTF,
+	TRXC_SACCHTH_0,
+	TRXC_SACCHTH_1,
+	TRXC_SACCH4_0,
+	TRXC_SACCH4_1,
+	TRXC_SACCH4_2,
+	TRXC_SACCH4_3,
+	TRXC_SACCH8_0,
+	TRXC_SACCH8_1,
+	TRXC_SACCH8_2,
+	TRXC_SACCH8_3,
+	TRXC_SACCH8_4,
+	TRXC_SACCH8_5,
+	TRXC_SACCH8_6,
+	TRXC_SACCH8_7,
+	TRXC_PDTCH,
+	TRXC_PTCCH,
+	_TRX_CHAN_MAX
+};
+
+/* States each channel on a multiframe */
+struct trx_chan_state {
+	uint8_t			dl_active;	/* Channel is active for TX */
+	uint8_t			ul_active;	/* Channel is active for RX */
+	ubit_t			*dl_bursts;	/* burst buffer for TX */
+	sbit_t			*ul_bursts;	/* burst buffer for RX */
+	uint32_t		ul_first_fn;	/* fn of first burst */
+	uint8_t			ul_mask;	/* mask of received bursts */
+	uint8_t			sacch_lost;	/* SACCH loss detection */
+};
+
+struct trx_config {
+	uint8_t			poweron;	/* poweron(1) or poweroff(0) */
+	int			poweron_sent;
+
+	int			arfcn_valid;
+	uint16_t		arfcn;
+	int			arfcn_sent;
+
+	int			tsc_valid;
+	uint8_t			tsc;
+	int			tsc_sent;
+
+	int			bsic_valid;
+	uint8_t			bsic;
+	int			bsic_sent;
+
+	int			rxgain_valid;
+	int			rxgain;
+	int			rxgain_sent;
+
+	int			power_valid;
+	int			power;
+	int			power_sent;
+
+	int			maxdly_valid;
+	int			maxdly;
+	int			maxdly_sent;
+
+	uint8_t			slotmask;
+
+	int			slottype_valid[8];
+	uint8_t			slottype[8];
+	int			slottype_sent[8];
+};
+
+struct trx_l1h {
+	struct llist_head	trx_ctrl_list;
+
+	struct gsm_bts_trx	*trx;
+
+	struct osmo_fd		trx_ofd_ctrl;
+	struct osmo_timer_list	trx_ctrl_timer;
+	struct osmo_fd		trx_ofd_data;
+
+	/* tranceiver config */
+	struct trx_config	config;
+
+	uint8_t			mf_index[8];	/* selected multiframe index */
+
+	/* Channel states for all channels on all timeslots */
+	struct trx_chan_state	chan_states[8][_TRX_CHAN_MAX];
+	struct llist_head	dl_prims[8];	/* Queue primitves for TX */
+};
+
+struct trx_l1h *l1if_open(struct gsm_bts_trx *trx);
+void l1if_close(struct trx_l1h *l1h);
+void l1if_reset(struct trx_l1h *l1h);
+int l1if_provision_tranceiver_trx(struct trx_l1h *l1h);
+int l1if_provision_tranceiver(struct gsm_bts *bts);
+int l1if_mph_time_ind(struct gsm_bts *bts, uint32_t fn);
+
+#endif /* L1_IF_H_TRX */