/* * (C) 2022 by sysmocom s.f.m.c. GmbH * All Rights Reserved * * Author: Philipp Maier * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern void *tall_pcu_ctx; const uint8_t fn_inc_table[4] = { 4, 4, 5, 0 }; const uint8_t blk_nr_table[4] = { 4, 4, 5, 0 }; #define SYNC_CHECK_INTERVAL GSM_TDMA_SUPERFRAME * 8 /* Subtrahend to convert Ericsson adjusted (block ending) fn to regular fn (uplink only) */ #define AFN_SUBTRAHEND 3 #define LOGPL1IF(ccu_descr, level, tag, fmt, args...) \ LOGP(DL1IF, level, "%s: PDCH(trx=%u,ts=%u) E1-line(line=%u,ts=%u,ss=%u) " fmt, \ tag, ccu_descr->pcu.trx_no, ccu_descr->pcu.ts, \ ccu_descr->e1_conn_pars->e1_nr, ccu_descr->e1_conn_pars->e1_ts, \ ccu_descr->e1_conn_pars->e1_ts_ss == E1_SUBSLOT_FULL ? 0 : ccu_descr->e1_conn_pars->e1_ts_ss, \ ## args) /* Calculate GPRS block number from frame number */ static uint8_t fn_to_block_nr(uint32_t fn) { /* Note: See also 3GPP TS 03.64 6.5.7.2.1, * Mapping on the multiframe structure */ uint8_t rel_fn; uint8_t super_block; uint8_t local_block; rel_fn = fn % 52; /* Warn in case of frames that do not belong to a block */ if (rel_fn == 12 || rel_fn == 25 || rel_fn == 38 || rel_fn == 51) LOGP(DL1IF, LOGL_ERROR, "Frame number is referencing invalid block!\n"); super_block = (rel_fn / 13); local_block = rel_fn % 13 / 4; return super_block * 3 + local_block; } static uint32_t fn_dl_advance(uint32_t fn, uint32_t n_blocks) { uint32_t i; uint8_t inc_fn; for (i = 0; i < n_blocks; i++) { inc_fn = fn_inc_table[(fn % 13) / 4]; fn = GSM_TDMA_FN_SUM(fn, inc_fn); } return fn; } static bool mac_block_is_noise(struct er_gprs_trau_frame *trau_frame) { switch (trau_frame->u.ccu_data_ind.cs_hdr) { case CS_OR_HDR_CS1: case CS_OR_HDR_CS2: case CS_OR_HDR_CS3: case CS_OR_HDR_CS4: if (!trau_frame->u.ccu_data_ind.u.gprs.parity_ok) return true; break; case CS_OR_HDR_HDR1: case CS_OR_HDR_HDR2: case CS_OR_HDR_HDR3: if (!trau_frame->u.ccu_data_ind.u.egprs.hdr_good) return true; if (!trau_frame->u.ccu_data_ind.u.egprs.data_good[0] && !trau_frame->u.ccu_data_ind.u.egprs.data_good[1]) return true; break; case CS_OR_HDR_AB: /* We are not interested in receiving access bursts. */ return true; } /* No noise, this block is interesting for us. */ return false; } static void log_data_ind(struct er_ccu_descr *ccu_descr, struct er_gprs_trau_frame *trau_frame, uint32_t afn_ul_comp, uint32_t afn_dl_comp) { switch (trau_frame->u.ccu_data_ind.cs_hdr) { case CS_OR_HDR_CS1: case CS_OR_HDR_CS2: case CS_OR_HDR_CS3: case CS_OR_HDR_CS4: LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-DATA-IND", "tav=%u, dbe=%u, cs_hdr=%u, rx_lev=%u, est_acc_del_dev=%u," "block_qual=%u, parity_ok=%u, data=%s<==, afn_ul_comp=%u/%u\n", trau_frame->u.ccu_data_ind.tav, trau_frame->u.ccu_data_ind.dbe, trau_frame->u.ccu_data_ind.cs_hdr, trau_frame->u.ccu_data_ind.rx_lev, trau_frame->u.ccu_data_ind.est_acc_del_dev, trau_frame->u.ccu_data_ind.u.gprs.block_qual, trau_frame->u.ccu_data_ind.u.gprs.parity_ok, osmo_hexdump_nospc(trau_frame->u.ccu_data_ind.data, trau_frame->u.ccu_data_ind.data_len), afn_ul_comp, afn_ul_comp % 52); break; case CS_OR_HDR_HDR1: case CS_OR_HDR_HDR2: case CS_OR_HDR_HDR3: case CS_OR_HDR_AB: LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-DATA-IND", "tav=%u, dbe=%u, cs_hdr=%u, rx_lev=%u, est_acc_del_dev=%u," "mean_bep=%u, cv_bep=%u, hdr_good=%u, data_good[0]=%u, data_good[1]=%u, data=%s<==, afn_ul_comp=%u/%u\n", trau_frame->u.ccu_data_ind.tav, trau_frame->u.ccu_data_ind.dbe, trau_frame->u.ccu_data_ind.cs_hdr, trau_frame->u.ccu_data_ind.rx_lev, trau_frame->u.ccu_data_ind.est_acc_del_dev, trau_frame->u.ccu_data_ind.u.egprs.mean_bep, trau_frame->u.ccu_data_ind.u.egprs.cv_bep, trau_frame->u.ccu_data_ind.u.egprs.hdr_good, trau_frame->u.ccu_data_ind.u.egprs.data_good[0], trau_frame->u.ccu_data_ind.u.egprs.data_good[1], osmo_hexdump_nospc(trau_frame->u.ccu_data_ind.data, trau_frame->u.ccu_data_ind.data_len), afn_ul_comp, afn_ul_comp % 52); } } /* Receive block from CCU */ static void er_ccu_rx_cb(struct er_ccu_descr *ccu_descr, const ubit_t *bits, unsigned int num_bits) { int rc; struct er_gprs_trau_frame trau_frame; uint8_t inc_ul; uint8_t inc_dl; uint32_t afn_ul; uint32_t afn_dl; uint32_t afn_ul_comp; uint32_t afn_dl_comp; struct pcu_l1_meas meas = { 0 }; struct gprs_rlcmac_bts *bts; struct gprs_rlcmac_pdch *pdch; /* Compute the current frame numbers from the last frame number */ inc_ul = fn_inc_table[(ccu_descr->sync.last_afn_ul % 13) / 4]; inc_dl = fn_inc_table[(ccu_descr->sync.last_afn_dl % 13) / 4]; afn_ul = GSM_TDMA_FN_SUM(ccu_descr->sync.last_afn_ul, inc_ul); afn_dl = GSM_TDMA_FN_SUM(ccu_descr->sync.last_afn_dl, inc_dl); /* Compute compensated frame numbers. This will be the framenumbers we * will use to exchange blocks with the PCU code. The following applies: * * 1. The uplink related frame numbers sent by the ericsson CCU refer to the end of a block. This is * compensated by subtracting three frames. * 2. The CCU downlink frame number runs one block past the uplink frame number. This needs to be * compesated as well (+1). * 3. The difference between the local (PCU) and the returned (CCU) pseq counter value is the number of blocks * that the PCU must * shift its downlink alignment in order to compensate the link latency between PCU and CCU. */ afn_ul_comp = GSM_TDMA_FN_SUB(afn_ul, AFN_SUBTRAHEND); afn_dl_comp = afn_dl; afn_dl_comp = fn_dl_advance(afn_dl_comp, GSM_TDMA_FN_DIFF(ccu_descr->sync.pseq_pcu, ccu_descr->sync.pseq_ccu) + 1); LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-SYNC", "afn_ul=%u/%u, afn_dl=%u/%u, afn_diff=%u => afn_ul_comp=%u/%u, afn_dl_comp=%u/%u, afn_diff_comp=%u\n", afn_ul, afn_ul % 52, afn_dl, afn_dl % 52, GSM_TDMA_FN_DIFF(afn_ul, afn_dl), afn_ul_comp, afn_ul_comp % 52, afn_dl_comp, afn_dl_comp % 52, GSM_TDMA_FN_DIFF(afn_ul_comp, afn_dl_comp)); LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-SYNC", "pseq_pcu=%u, pseq_ccu=%u, pseq_diff=%u\n", ccu_descr->sync.pseq_pcu, ccu_descr->sync.pseq_ccu, GSM_TDMA_FN_DIFF(ccu_descr->sync.pseq_pcu, ccu_descr->sync.pseq_ccu)); /* Decode indication from CCU */ if (ccu_descr->e1_conn_pars->e1_ts_ss == E1_SUBSLOT_FULL) rc = er_gprs_trau_frame_decode_64k(&trau_frame, bits); else rc = er_gprs_trau_frame_decode_16k(&trau_frame, bits); if (rc < 0) { LOGPL1IF(ccu_descr, LOGL_ERROR, "CCU-XXXX-IND", "unable to decode uplink TRAU frame, afn_ul_comp=%u/%u\n", afn_ul_comp, afn_ul_comp % 52); /* Report to the CCU that there is an issue with uplink TRAU frames, the CCU will then send * a CCU-SYNC-IND within the next TRAU frame, so we can check if we are still in sync and trigger * synchronization procedure if necessary. */ ccu_descr->sync.ul_frame_err = true; goto skip; } switch (trau_frame.type) { case ER_GPRS_TRAU_FT_SYNC: if (trau_frame.u.ccu_sync_ind.pseq != 0x3FFFFF) { LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-SYNC-IND", "tav=%u, dbe=%u, dfe=%u, pseq=%u, afn_ul=%u, afn_dl=%u\n", trau_frame.u.ccu_sync_ind.tav, trau_frame.u.ccu_sync_ind.dbe, trau_frame.u.ccu_sync_ind.dfe, trau_frame.u.ccu_sync_ind.pseq, trau_frame.u.ccu_sync_ind.afn_ul, trau_frame.u.ccu_sync_ind.afn_dl); /* Synchronize the current CCU PSEQ state */ ccu_descr->sync.pseq_ccu = trau_frame.u.ccu_sync_ind.pseq; } else { LOGPL1IF(ccu_descr, LOGL_DEBUG, "CCU-SYNC-IND", "tav=%u, dbe=%u, dfe=%u, pseq=(none), afn_ul=%u, afn_dl=%u\n", trau_frame.u.ccu_sync_ind.tav, trau_frame.u.ccu_sync_ind.dbe, trau_frame.u.ccu_sync_ind.dfe, trau_frame.u.ccu_sync_ind.afn_ul, trau_frame.u.ccu_sync_ind.afn_dl); } ccu_descr->sync.tav = trau_frame.u.ccu_sync_ind.tav; /* Check if we are in sync with the CCU, if not trigger synchronization procedure */ if (afn_ul != trau_frame.u.ccu_sync_ind.afn_ul || afn_dl != trau_frame.u.ccu_sync_ind.afn_dl) { if (afn_ul != trau_frame.u.ccu_sync_ind.afn_ul) LOGPL1IF(ccu_descr, LOGL_NOTICE, "CCU-SYNC-IND", "afn_ul=%u (computed) != afn_ul=%u (sync-ind) => delta=%u\n", afn_ul, trau_frame.u.ccu_sync_ind.afn_ul, GSM_TDMA_FN_DIFF(afn_ul, trau_frame.u.ccu_sync_ind.afn_ul)); if (afn_dl != trau_frame.u.ccu_sync_ind.afn_dl) LOGPL1IF(ccu_descr, LOGL_NOTICE, "CCU-SYNC-IND", "afn_dl=%u (computed) != afn_dl=%u (sync-ind) => delta=%u\n", afn_dl, trau_frame.u.ccu_sync_ind.afn_dl, GSM_TDMA_FN_DIFF(afn_dl, trau_frame.u.ccu_sync_ind.afn_dl)); LOGPL1IF(ccu_descr, LOGL_NOTICE, "CCU-SYNC-IND", "FN jump detected, lost sync with CCU -- (re)synchronizing...\n"); ccu_descr->sync.ccu_synced = false; } else { LOGPL1IF(ccu_descr, LOGL_NOTICE, "CCU-SYNC-IND", "in sync with CCU\n"); ccu_descr->sync.ccu_synced = true; } /* Overwrite calculated afn_ul and afn_dl with the actual values from the SYNC indication */ afn_ul = trau_frame.u.ccu_sync_ind.afn_ul; afn_dl = trau_frame.u.ccu_sync_ind.afn_dl; break; case ER_GPRS_TRAU_FT_DATA: ccu_descr->sync.tav = trau_frame.u.ccu_data_ind.tav; /* Ignore all data indications that contain only noise */ if (mac_block_is_noise(&trau_frame)) break; log_data_ind(ccu_descr, &trau_frame, afn_ul_comp, afn_dl_comp); /* Hand received MAC block into PCU */ bts = gprs_pcu_get_bts_by_nr(the_pcu, ccu_descr->pcu.bts_nr); if (!bts) break; meas.have_rssi = 1; meas.rssi = rxlev2dbm(trau_frame.u.ccu_data_ind.rx_lev); meas.have_link_qual = 1; meas.link_qual = trau_frame.u.ccu_data_ind.u.gprs.block_qual; pdch = &bts->trx[ccu_descr->pcu.trx_no].pdch[ccu_descr->pcu.ts]; rc = pcu_rx_data_ind_pdtch(bts, pdch, trau_frame.u.ccu_data_ind.data, trau_frame.u.ccu_data_ind.data_len, afn_ul_comp, &meas); break; default: LOGPL1IF(ccu_descr, LOGL_ERROR, "CCU-XXXX-IND", "unhandled CCU indication!\n"); } skip: if (ccu_descr->sync.ccu_synced) { bts = gprs_pcu_get_bts_by_nr(the_pcu, ccu_descr->pcu.bts_nr); if (bts) { /* The PCU timing is locked to the uplink fame number. The downlink frame number is advanced * into the future so that the line latency is compensated and the frame arrives at the right * point in time. */ pdch = &bts->trx[ccu_descr->pcu.trx_no].pdch[ccu_descr->pcu.ts]; pcu_rx_block_time(bts, pdch->trx->arfcn, afn_ul_comp, ccu_descr->pcu.ts); rc = pcu_rx_rts_req_pdtch(bts, ccu_descr->pcu.trx_no, ccu_descr->pcu.ts, afn_dl_comp, fn_to_block_nr(afn_dl_comp)); } } /* We do not receive sync indications in every cycle. When traffic is transferred we won't get frame numbers * from the CCU. In this case we must update the last_afn_ul/dl values from the computed frame numbers * (see above) */ ccu_descr->sync.last_afn_ul = afn_ul; ccu_descr->sync.last_afn_dl = afn_dl; ccu_descr->sync.pseq_pcu++; ccu_descr->sync.pseq_ccu++; } static void er_ccu_empty_cb(struct er_ccu_descr *ccu_descr) { struct er_gprs_trau_frame trau_frame; ubit_t trau_frame_encoded[ER_GPRS_TRAU_FRAME_LEN_64K]; int rc; memset(&trau_frame, 0, sizeof(trau_frame)); trau_frame.u.pcu_sync_ind.pseq = ccu_descr->sync.pseq_pcu; trau_frame.u.pcu_sync_ind.tav = ccu_descr->sync.tav; trau_frame.u.pcu_sync_ind.fn_ul = 0x3FFFFF; trau_frame.u.pcu_sync_ind.fn_dl = 0x3FFFFF; trau_frame.u.pcu_sync_ind.fn_ss = 0x3FFFFF; trau_frame.u.pcu_sync_ind.ls = 0x3FFFFF; trau_frame.u.pcu_sync_ind.ss = 0x3FFFFF; trau_frame.type = ER_GPRS_TRAU_FT_SYNC; if (ccu_descr->e1_conn_pars->e1_ts_ss == E1_SUBSLOT_FULL) rc = er_gprs_trau_frame_encode_64k(trau_frame_encoded, &trau_frame); else rc = er_gprs_trau_frame_encode_16k(trau_frame_encoded, &trau_frame); if (rc < 0) { LOGPL1IF(ccu_descr, LOGL_ERROR, "PCU-SYNC-IND", "unable to encode TRAU frame\n"); return; } LOGPL1IF(ccu_descr, LOGL_DEBUG, "PCU-SYNC-IND", "pseq=%u, tav=%u\n", trau_frame.u.pcu_sync_ind.pseq, trau_frame.u.pcu_sync_ind.tav); er_ccu_if_tx(ccu_descr, trau_frame_encoded, rc); /* Make sure timing adjustment value is reset after use */ ccu_descr->sync.tav = TIME_ADJ_NONE; } /* use the length of the block to determine the coding scheme */ static int cs_hdr_from_len(uint8_t len) { switch (len) { case 23: return CS_OR_HDR_CS1; case 34: return CS_OR_HDR_CS2; case 40: return CS_OR_HDR_CS3; case 54: return CS_OR_HDR_CS4; case 27: case 33: case 42: case 49: return CS_OR_HDR_HDR3; case 60: case 78: return CS_OR_HDR_HDR2; case 118: case 142: case 154: return CS_OR_HDR_HDR1; default: return -EINVAL; } } /* send packet data request to L1 */ int l1if_pdch_req(void *obj, uint8_t ts, int is_ptcch, uint32_t fn, uint16_t arfcn, uint8_t block_nr, uint8_t *data, uint8_t len) { struct er_trx_descr *trx_descr = obj; struct er_ccu_descr *ccu_descr; struct er_gprs_trau_frame trau_frame; ubit_t trau_frame_encoded[ER_GPRS_TRAU_FRAME_LEN_64K]; struct gprs_rlcmac_bts *bts; int rc; /* Make sure that the CCU is synchronized and connected. */ if (!trx_descr) { LOGP(DL1IF, LOGL_ERROR, "PCU-DATA-IND: PDCH(ts=%u, arfcn=%u) no TRX context, tossing MAC block...\n", ts, arfcn); return -EINVAL; } ccu_descr = &trx_descr->ts_ccu_descr[ts]; if (!ccu_descr->link.ccu_connected) { LOGPL1IF(ccu_descr, LOGL_NOTICE, "PCU-DATA-IND", "CCU not connected, tossing MAC block...\n"); return -EINVAL; } if (!ccu_descr->sync.ccu_synced) { LOGPL1IF(ccu_descr, LOGL_NOTICE, "PCU-DATA-IND", "CCU not synchronized, tossing MAC block...\n"); return -EINVAL; } /* Hand received MAC block into PCU */ bts = gprs_pcu_get_bts_by_nr(the_pcu, ccu_descr->pcu.bts_nr); if (!bts) { LOGPL1IF(ccu_descr, LOGL_NOTICE, "PCU-DATA-IND", "no BTS, tossing MAC block...\n"); return -EINVAL; } memset(&trau_frame, 0, sizeof(trau_frame)); trau_frame.type = ER_GPRS_TRAU_FT_DATA; rc = cs_hdr_from_len(len); if (rc < 0) { LOGPL1IF(ccu_descr, LOGL_ERROR, "PCU-DATA-IND", "unable to encode TRAU frame, invalid CS or MCS value set\n"); return -EINVAL; } trau_frame.u.pcu_data_ind.cs_hdr = (enum er_cs_or_hdr)rc; trau_frame.u.pcu_data_ind.tav = ccu_descr->sync.tav; trau_frame.u.pcu_data_ind.ul_frame_err = ccu_descr->sync.ul_frame_err; if (bts->mcs_mask) trau_frame.u.pcu_data_ind.ul_chan_mode = ER_UL_CHMOD_NB_UNKN; else trau_frame.u.pcu_data_ind.ul_chan_mode = ER_UL_CHMOD_NB_GMSK; OSMO_ASSERT(len < sizeof(trau_frame.u.pcu_data_ind.data)); memcpy(trau_frame.u.pcu_data_ind.data, data, len); /* Regulary ignore one MAC block in uplink. The CCU will then send one CCU-SYNC-IND instead. We use this * indication to check whether we are still in sync with the CCU. */ if (fn % SYNC_CHECK_INTERVAL == 0) trau_frame.u.pcu_data_ind.ul_chan_mode = ER_UL_CHMOD_VOID; if (ccu_descr->e1_conn_pars->e1_ts_ss == E1_SUBSLOT_FULL) rc = er_gprs_trau_frame_encode_64k(trau_frame_encoded, &trau_frame); else rc = er_gprs_trau_frame_encode_16k(trau_frame_encoded, &trau_frame); if (rc < 0) { LOGPL1IF(ccu_descr, LOGL_ERROR, "PCU-DATA-IND", "unable to encode TRAU frame\n"); return -EINVAL; } LOGPL1IF(ccu_descr, LOGL_DEBUG, "PCU-DATA-IND", "tav=%u, ul_frame_err=%u, cs_hdr=%u, ul_chan_mode=%u, atten_db=%u, timing_offset=%u," " data=%s==>, fn=%u/%u (comp)\n", trau_frame.u.pcu_data_ind.tav, trau_frame.u.pcu_data_ind.ul_frame_err, trau_frame.u.pcu_data_ind.cs_hdr, trau_frame.u.pcu_data_ind.ul_chan_mode, trau_frame.u.pcu_data_ind.atten_db, trau_frame.u.pcu_data_ind.timing_offset, osmo_hexdump_nospc(trau_frame.u.pcu_data_ind.data, len), fn, fn % 52); er_ccu_if_tx(ccu_descr, trau_frame_encoded, rc); /* Make sure timing adjustment value is reset after use */ ccu_descr->sync.tav = TIME_ADJ_NONE; ccu_descr->sync.ul_frame_err = false; return 0; } void *l1if_open_trx(uint8_t bts_nr, uint8_t trx_no, uint32_t hlayer1, struct gsmtap_inst *gsmtap) { struct er_trx_descr *trx_descr; unsigned int i; /* Note: We do not have enough information to really open anything at * this point. We will just create the TRX context and fill it wit basic * CCU context (one for each TS) */ trx_descr = talloc_zero(tall_pcu_ctx, struct er_trx_descr); OSMO_ASSERT(trx_descr); for (i = 0; i < ARRAY_SIZE(trx_descr->ts_ccu_descr); i++) { trx_descr->ts_ccu_descr[i].er_ccu_rx_cb = er_ccu_rx_cb; trx_descr->ts_ccu_descr[i].er_ccu_empty_cb = er_ccu_empty_cb; trx_descr->ts_ccu_descr[i].pcu.trx_no = trx_no; trx_descr->ts_ccu_descr[i].pcu.bts_nr = bts_nr; trx_descr->ts_ccu_descr[i].pcu.ts = i; } return trx_descr; } int l1if_close_trx(void *obj) { struct er_trx_descr *trx_descr = obj; unsigned int i; if (!trx_descr) { LOGP(DL1IF, LOGL_ERROR, "PCU-DATA-IND: no TRX context, cannot close unknown TRX...\n"); return -EINVAL; } for (i = 0; i < ARRAY_SIZE(trx_descr->ts_ccu_descr); i++) er_ccu_if_close(&trx_descr->ts_ccu_descr[i]); talloc_free(trx_descr); return 0; } int l1if_connect_pdch(void *obj, uint8_t ts) { struct er_trx_descr *trx_descr = obj; struct er_ccu_descr *ccu_descr; int rc; if (!trx_descr) { LOGP(DL1IF, LOGL_ERROR, "SETUP: PDCH(ts=%u) no CCU context, TRX never opened before?\n", ts); return -EINVAL; } ccu_descr = &trx_descr->ts_ccu_descr[ts]; rc = pcu_l1if_get_e1_ccu_conn_pars(&ccu_descr->e1_conn_pars, ccu_descr->pcu.bts_nr, ccu_descr->pcu.trx_no, ccu_descr->pcu.ts); if (rc < 0) { LOGPL1IF(ccu_descr, LOGL_ERROR, "SETUP", "cannot find E1 connection parameters for CCU\n"); return -EINVAL; } rc = er_ccu_if_open(ccu_descr); if (rc < 0) return -EINVAL; return 0; } int l1if_disconnect_pdch(void *obj, uint8_t ts) { struct er_trx_descr *trx_descr = obj; struct er_ccu_descr *ccu_descr; if (!trx_descr) { LOGP(DL1IF, LOGL_ERROR, "SETUP: PDCH(ts=%u) no TRX context, TRX never opened before?\n", ts); return -EINVAL; } ccu_descr = &trx_descr->ts_ccu_descr[ts]; er_ccu_if_close(ccu_descr); return 0; } int l1if_init(void) { er_ccu_if_init(tall_pcu_ctx); return 0; }