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Diffstat (limited to 'Src/osmoconbb/src/target/firmware/layer1/prim_tch.c')
-rw-r--r--Src/osmoconbb/src/target/firmware/layer1/prim_tch.c752
1 files changed, 0 insertions, 752 deletions
diff --git a/Src/osmoconbb/src/target/firmware/layer1/prim_tch.c b/Src/osmoconbb/src/target/firmware/layer1/prim_tch.c
deleted file mode 100644
index 96858fb..0000000
--- a/Src/osmoconbb/src/target/firmware/layer1/prim_tch.c
+++ /dev/null
@@ -1,752 +0,0 @@
-/* Layer 1 - TCH */
-
-/* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
- * (C) 2010 by Sylvain Munaut <tnt@246tnt.com>
- *
- * All Rights Reserved
- *
- * 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, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-
-#include <defines.h>
-#include <debug.h>
-#include <memory.h>
-#include <byteorder.h>
-#include <osmocom/gsm/gsm_utils.h>
-#include <osmocom/gsm/protocol/gsm_04_08.h>
-#include <osmocom/core/msgb.h>
-#include <calypso/dsp_api.h>
-#include <calypso/irq.h>
-#include <calypso/tpu.h>
-#include <calypso/tsp.h>
-#include <calypso/dsp.h>
-#include <calypso/timer.h>
-#include <comm/sercomm.h>
-
-#include <rffe.h>
-#include <layer1/sync.h>
-#include <layer1/afc.h>
-#include <layer1/agc.h>
-#include <layer1/toa.h>
-#include <layer1/tdma_sched.h>
-#include <layer1/mframe_sched.h>
-#include <layer1/tpu_window.h>
-#include <layer1/l23_api.h>
-#include <layer1/rfch.h>
-#include <layer1/prim.h>
-
-#include <l1ctl_proto.h>
-
-
-/* This computes various parameters both for the DSP and for
- * our logic. Not all are used all the time, but it's easier
- * to build all in one place */
-static void tch_get_params(struct gsm_time *time, uint8_t chan_nr,
- uint32_t *fn_report, uint8_t *tch_f_hn,
- uint8_t *tch_sub, uint8_t *tch_mode)
-{
- uint8_t tn = chan_nr & 0x07;
- uint8_t cbits = chan_nr >> 3;
-
- *tch_f_hn = (cbits & 2) ? 0 : 1;
-
- if (*tch_f_hn) {
- *fn_report = (time->fn - (tn * 13) + 104) % 104;
- *tch_sub = 0;
- } else {
- uint8_t chan_sub = cbits & 1;
- uint8_t tn_report = (tn & ~1) | chan_sub;
- *fn_report = (time->fn - (tn_report * 13) + 104) % 104;
- *tch_sub = chan_sub;
- }
-
- if (tch_mode) {
- switch (l1s.tch_mode) {
- case GSM48_CMODE_SPEECH_V1:
- *tch_mode = *tch_f_hn ? TCH_FS_MODE : TCH_HS_MODE;
- break;
- case GSM48_CMODE_SPEECH_EFR:
- *tch_mode = *tch_f_hn ? TCH_EFR_MODE : SIG_ONLY_MODE;
- break;
- default:
- *tch_mode = SIG_ONLY_MODE;
- }
- }
-}
-
-
-/* -------------------------------------------------------------------------
- * Shared completion handler
- * ------------------------------------------------------------------------- */
-
-/*
- * FIXME We really need a better way to handle completion, where we can
- * pass arguments and such ...
- *
- * Right now, we just 'hope' it gets processed before the next one ...
- */
-
-#define TX_TYPE_SACCH (1<<0)
-#define TX_TYPE_FACCH (1<<1)
-#define TX_TYPE_TRAFFIC (1<<2)
-
-static uint16_t last_tx_tch_fn;
-static uint16_t last_tx_tch_type;
-
-static void l1a_tx_tch_compl(__unused enum l1_compl c)
-{
- struct msgb *msg;
-
- if (last_tx_tch_type & (TX_TYPE_SACCH | TX_TYPE_FACCH)) {
- msg = l1_create_l2_msg(L1CTL_DATA_CONF, last_tx_tch_fn, 0, 0);
- l1_queue_for_l2(msg);
- }
-
- if (last_tx_tch_type & TX_TYPE_TRAFFIC) {
- msg = l1_create_l2_msg(L1CTL_TRAFFIC_CONF, last_tx_tch_fn, 0, 0);
- l1_queue_for_l2(msg);
- }
-
- last_tx_tch_type = 0;
-}
-
-static __attribute__ ((constructor)) void prim_tch_init(void)
-{
- l1s.completion[L1_COMPL_TX_TCH] = &l1a_tx_tch_compl;
-}
-
-
-/* -------------------------------------------------------------------------
- * TCH: Voice & FACCH
- * ------------------------------------------------------------------------- */
-
-/*
- * Voice and FACCH data are spread in various ways depending on a lot of
- * factors. Trying to handle that with the mframe scheduler is just a mess,
- * so we schedule it burst by burst and handle the complex logic inside the
- * primitive task code itself.
- */
-
-
-#define FACCH_MEAS_HIST 8 /* Up to 8 bursts history */
-struct l1s_rx_tch_state {
- struct l1s_meas_hdr meas[FACCH_MEAS_HIST];
-};
-
-static struct l1s_rx_tch_state rx_tch;
-
-
-static int l1s_tch_resp(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- static uint8_t meas_id = 0;
- uint8_t mf_task_id = p3 & 0xff;
- struct gsm_time rx_time;
- uint8_t chan_nr;
- uint16_t arfcn;
- uint8_t tsc, tn;
- uint8_t tch_f_hn, tch_sub;
- uint32_t fn_report;
- int facch_rx_now, traffic_rx_now;
-
- /* Get/compute various parameters */
- gsm_fn2gsmtime(&rx_time, (l1s.current_time.fn - 1 + GSM_MAX_FN) % GSM_MAX_FN);
- rfch_get_params(&rx_time, &arfcn, &tsc, &tn);
- chan_nr = mframe_task2chan_nr(mf_task_id, tn);
- tch_get_params(&rx_time, chan_nr, &fn_report, &tch_f_hn, &tch_sub, NULL);
-
- meas_id = (meas_id + 1) % FACCH_MEAS_HIST; /* absolute value doesn't matter */
-
- /* Collect measurements */
- rx_tch.meas[meas_id].toa_qbit = dsp_api.db_r->a_serv_demod[D_TOA];
- rx_tch.meas[meas_id].pm_dbm8 =
- agc_inp_dbm8_by_pm(dsp_api.db_r->a_serv_demod[D_PM] >> 3);
- rx_tch.meas[meas_id].freq_err =
- ANGLE_TO_FREQ(dsp_api.db_r->a_serv_demod[D_ANGLE]);
- rx_tch.meas[meas_id].snr = dsp_api.db_r->a_serv_demod[D_SNR];
-
- /* feed computed frequency error into AFC loop */
- if (rx_tch.meas[meas_id].snr > AFC_SNR_THRESHOLD)
- afc_input(rx_tch.meas[meas_id].freq_err, arfcn, 1);
- else
- afc_input(rx_tch.meas[meas_id].freq_err, arfcn, 0);
-
- /* feed computed TOA into TA loop */
- toa_input(rx_tch.meas[meas_id].toa_qbit << 2, rx_tch.meas[meas_id].snr);
-
- /* Tell the RF frontend to set the gain appropriately */
- rffe_compute_gain(rx_tch.meas[meas_id].pm_dbm8 / 8,
- CAL_DSP_TGT_BB_LVL);
-
- /* FACCH Block end ? */
- if (tch_f_hn) {
- /* FACCH/F: B0(0...7),B1(4...11),B2(8...11,0...3) (mod 13) */
- facch_rx_now = ((rx_time.fn % 13) % 4) == 3;
- } else {
- /* FAACH/H: See GSM 05.02 Clause 7 Table 1of9 */
- uint8_t t2_norm = rx_time.t2 - tch_sub;
- facch_rx_now = (t2_norm == 15) ||
- (t2_norm == 23) ||
- (t2_norm == 6);
- }
-
- if (facch_rx_now && (dsp_api.ndb->a_fd[0] & (1<<B_BLUD))) {
- struct msgb *msg;
- struct l1ctl_info_dl *dl;
- struct l1ctl_data_ind *di;
- uint16_t num_biterr;
- uint32_t avg_snr = 0;
- int32_t avg_dbm8 = 0;
- int i, n;
-
- /* Allocate msgb */
- /* FIXME: we actually want all allocation out of L1S! */
- msg = l1ctl_msgb_alloc(L1CTL_DATA_IND);
- if(!msg) {
- printf("TCH FACCH: unable to allocate msgb\n");
- goto skip_rx_facch;
- }
-
- dl = (struct l1ctl_info_dl *) msgb_put(msg, sizeof(*dl));
- di = (struct l1ctl_data_ind *) msgb_put(msg, sizeof(*di));
-
- /* Fill DL header (should be about the first burst ... here is the last) */
- dl->chan_nr = chan_nr;
- dl->link_id = 0x00; /* FACCH */
- dl->band_arfcn = htons(arfcn);
- dl->frame_nr = htonl(rx_time.fn);
-
- /* Average SNR & RX level */
- n = tch_f_hn ? 8 : 6;
- for (i=0; i<n; i++) {
- int j = (meas_id + FACCH_MEAS_HIST - i) % FACCH_MEAS_HIST;
- avg_snr += rx_tch.meas[j].snr;
- avg_dbm8 += rx_tch.meas[j].pm_dbm8;
- }
-
- dl->snr = avg_snr / n;
- dl->rx_level = dbm2rxlev(avg_dbm8 / (8*n));
-
- /* Errors & CRC status */
- num_biterr = dsp_api.ndb->a_fd[2] & 0xffff;
- if (num_biterr > 0xff)
- dl->num_biterr = 0xff;
- else
- dl->num_biterr = num_biterr;
-
- dl->fire_crc = ((dsp_api.ndb->a_fd[0] & 0xffff) & ((1 << B_FIRE1) | (1 << B_FIRE0))) >> B_FIRE0;
-
- /* Update rx level for pm report */
- pu_update_rx_level(dl->rx_level);
-
- /* Copy actual data, skipping the information block [0,1,2] */
- dsp_memcpy_from_api(di->data, &dsp_api.ndb->a_fd[3], 23, 0);
-
- /* Give message to up layer */
- l1_queue_for_l2(msg);
-
- skip_rx_facch:
- /* Reset A_FD header (needed by DSP) */
- /* B_FIRE1 =1, B_FIRE0 =0 , BLUD =0 */
- dsp_api.ndb->a_fd[0] = (1<<B_FIRE1);
- dsp_api.ndb->a_fd[2] = 0xffff;
-
- /* Reset A_DD_0 header in NDB (needed by DSP) */
- dsp_api.ndb->a_dd_0[0] = 0;
- dsp_api.ndb->a_dd_0[2] = 0xffff;
-
- /* Reset A_DD_1 header in NDB (needed by DSP) */
- dsp_api.ndb->a_dd_1[0] = 0;
- dsp_api.ndb->a_dd_1[2] = 0xffff;
- }
-
- /* Traffic now ? */
- if (tch_f_hn) {
- /* TCH/F: B0(0...7),B1(4...11),B2(8...11,0...3) (mod 13)*/
- traffic_rx_now = ((rx_time.fn % 13) % 4) == 3;
- } else {
- /* TCH/H0: B0(0,2,4,6),B1(4,6,8,10),B2(8,10,0,2) (mod 13) */
- /* H1: B0(1,3,5,7),B1(5,7,9,11),B2(9,11,1,3) (mod 13) */
- traffic_rx_now = (((rx_time.fn - tch_sub + 13) % 13) % 4) == 2;
- }
-
- if (traffic_rx_now) {
- volatile uint16_t *traffic_buf;
-
- traffic_buf = tch_sub ? dsp_api.ndb->a_dd_1 : dsp_api.ndb->a_dd_0;
-
- if (traffic_buf[0] & (1<<B_BLUD)) {
- /* Send the data to upper layers (if interested and good frame) */
- if ((l1s.audio_mode & AUDIO_RX_TRAFFIC_IND) &&
- !(dsp_api.ndb->a_dd_0[0] & (1<<B_BFI))) {
- struct msgb *msg;
- struct l1ctl_info_dl *dl;
- struct l1ctl_traffic_ind *ti;
-
- /* Allocate msgb */
- /* FIXME: we actually want all allocation out of L1S! */
- msg = l1ctl_msgb_alloc(L1CTL_TRAFFIC_IND);
- if(!msg) {
- printf("TCH traffic: unable to allocate msgb\n");
- goto skip_rx_traffic;
- }
-
- dl = (struct l1ctl_info_dl *) msgb_put(msg, sizeof(*dl));
- ti = (struct l1ctl_traffic_ind *) msgb_put(msg, sizeof(*ti));
-
- /* Copy actual data, skipping the information block [0,1,2] */
- dsp_memcpy_from_api(ti->data, &traffic_buf[3], 33, 1);
-
- /* Give message to up layer */
- l1_queue_for_l2(msg);
- }
-
- skip_rx_traffic:
- /* Reset traffic buffer header in NDB (needed by DSP) */
- traffic_buf[0] = 0;
- traffic_buf[2] = 0xffff;
- }
- }
-
- /* mark READ page as being used */
- dsp_api.r_page_used = 1;
-
- return 0;
-}
-
-static int l1s_tch_cmd(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- uint8_t mf_task_id = p3 & 0xff;
- uint8_t chan_nr;
- uint16_t arfcn;
- uint8_t tsc, tn;
- uint8_t tch_f_hn, tch_sub, tch_mode;
- uint32_t fn_report;
- uint8_t sync = 0;
- static int icnt;
- int facch_tx_now, traffic_tx_now;
-
- /* Get/compute various parameters */
- rfch_get_params(&l1s.next_time, &arfcn, &tsc, &tn);
- chan_nr = mframe_task2chan_nr(mf_task_id, tn);
- tch_get_params(&l1s.next_time, chan_nr, &fn_report, &tch_f_hn, &tch_sub, &tch_mode);
-
- /* Sync & FACCH delay */
- if (l1s.tch_sync) {
- l1s.tch_sync = 0;
- sync = 1;
- icnt = 0;
- } else if (icnt <= 26)
- icnt++;
-
- /* Load FACCH data if we start a new burst */
- /* (the DSP wants the data on the CMD of the burst _preceding_ the
- * first burst) */
- if (tch_f_hn) {
- /* FACCH/F: B0(0...7),B1(4...11),B2(8...11,0...3) */
- facch_tx_now = ((l1s.next_time.fn % 13) % 4) == 3;
- } else {
- /* FAACH/H: See GSM 05.02 Clause 7 Table 1of9 */
- uint8_t t2_norm = l1s.next_time.t2 - tch_sub;
- facch_tx_now = (t2_norm == 23) ||
- (t2_norm == 6) ||
- (t2_norm == 15);
- }
-
- if (facch_tx_now) {
- uint16_t *info_ptr = dsp_api.ndb->a_fu;
- struct msgb *msg;
- const uint8_t *data;
-
- /* Pull FACCH data (if ready) */
- if (icnt > 26)
- msg = msgb_dequeue(&l1s.tx_queue[L1S_CHAN_MAIN]);
- else
- msg = NULL;
-
- /* If TX is empty and we're signalling only, use dummy frame */
- if (msg)
- data = msg->l3h;
- else if (tch_mode == SIG_ONLY_MODE)
- data = pu_get_idle_frame();
- else
- data = NULL;
-
- /* Do we really send something ? */
- if (data) {
- /* Fill data block header */
- info_ptr[0] = (1 << B_BLUD); /* 1st word: Set B_BLU bit. */
- info_ptr[1] = 0; /* 2nd word: cleared. */
- info_ptr[2] = 0; /* 3nd word: cleared. */
-
- /* Copy the actual data after the header */
- dsp_memcpy_to_api(&info_ptr[3], data, 23, 0);
- }
-
- /* Indicate completion (FIXME: early but easier this way for now) */
- if (msg) {
- last_tx_tch_fn = l1s.next_time.fn;
- last_tx_tch_type |= TX_TYPE_FACCH;
- l1s_compl_sched(L1_COMPL_TX_TCH);
- }
-
- /* Free msg now that we're done with it */
- if (msg)
- msgb_free(msg);
- }
-
- /* Traffic now ? */
- if (tch_f_hn) {
- /* TCH/F: B0(0...7),B1(4...11),B2(8...11,0...3) (mod 13)*/
- traffic_tx_now = ((l1s.next_time.fn % 13) % 4) == 3;
- } else {
- /* TCH/H0: B0(0,2,4,6),B1(4,6,8,10),B2(8,10,0,2) (mod 13) */
- /* H1: B0(1,3,5,7),B1(5,7,9,11),B2(9,11,1,3) (mod 13) */
- traffic_tx_now = (((l1s.next_time.fn - tch_sub + 13) % 13) % 4) == 2;
- }
-
- if (traffic_tx_now) {
- volatile uint16_t *traffic_buf;
- struct msgb *msg;
- const uint8_t *data;
-
- /* Reset play mode */
- dsp_api.ndb->d_tch_mode &= ~B_PLAY_UL;
-
- /* Check l1s audio mode */
- if (!(l1s.audio_mode & AUDIO_TX_TRAFFIC_REQ))
- goto skip_tx_traffic;
-
- /* Traffic buffer = !tch_sub */
- traffic_buf = tch_sub ? dsp_api.ndb->a_du_0 : dsp_api.ndb->a_du_1;
-
- /* Pull Traffic data (if any) */
- msg = msgb_dequeue(&l1s.tx_queue[L1S_CHAN_TRAFFIC]);
-
- /* Copy actual data, skipping the information block [0,1,2] */
- if (msg) {
- data = msg->l2h;
- dsp_memcpy_to_api(&traffic_buf[3], data, 33, 1);
-
- traffic_buf[0] = (1 << B_BLUD); /* 1st word: Set B_BLU bit. */
- traffic_buf[1] = 0; /* 2nd word: cleared. */
- traffic_buf[2] = 0; /* 3nd word: cleared. */
- }
-
- if (msg)
- dsp_api.ndb->d_tch_mode |= B_PLAY_UL;
-
- /* Indicate completion (FIXME: early but easier this way for now) */
- if (msg) {
- last_tx_tch_fn = l1s.next_time.fn;
- last_tx_tch_type |= TX_TYPE_TRAFFIC;
- l1s_compl_sched(L1_COMPL_TX_TCH);
- }
-
- /* Free msg now that we're done with it */
- if (msg)
- msgb_free(msg);
- }
-skip_tx_traffic:
-
- /* Configure DSP for TX/RX */
- l1s_tx_apc_helper(arfcn);
-
- dsp_load_tch_param(
- &l1s.next_time,
- tch_mode, tch_f_hn ? TCH_F : TCH_H, tch_sub,
- 0, sync, tn
- );
-
- dsp_load_rx_task(TCHT_DSP_TASK, 0, tsc); /* burst_id unused for TCH */
- l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB, 0);
-
- dsp_load_tx_task(TCHT_DSP_TASK, 0, tsc); /* burst_id unused for TCH */
- l1s_tx_win_ctrl(arfcn, L1_TXWIN_NB, 0, 3);
-
- return 0;
-}
-
-
-const struct tdma_sched_item tch_sched_set[] = {
- SCHED_ITEM_DT(l1s_tch_cmd, 0, 0, 0), SCHED_END_FRAME(),
- SCHED_END_FRAME(),
- SCHED_ITEM(l1s_tch_resp, 0, 0, -4), SCHED_END_FRAME(),
- SCHED_END_SET()
-};
-
-
-/* -------------------------------------------------------------------------
- * TCH/H: Dummy
- * ------------------------------------------------------------------------- */
-
-/* This task is needed to perform some operation in the DSP when there is
- * no data to be exchanged */
-
-static int l1s_tch_d_resp(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- /* mark READ page as being used */
- dsp_api.r_page_used = 1;
-
- return 0;
-}
-
-static int l1s_tch_d_cmd(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- uint8_t mf_task_id = p3 & 0xff;
- uint8_t chan_nr;
- uint8_t tsc, tn;
- uint8_t tch_f_hn, tch_sub, tch_mode;
- uint32_t fn_report;
-
- /* Get/compute various parameters */
- rfch_get_params(&l1s.next_time, NULL, &tsc, &tn);
- chan_nr = mframe_task2chan_nr(mf_task_id, tn);
- tch_get_params(&l1s.next_time, chan_nr, &fn_report, &tch_f_hn, &tch_sub, &tch_mode);
-
- /* Configure DSP */
- dsp_load_tch_param(
- &l1s.next_time,
- tch_mode, tch_f_hn ? TCH_F : TCH_H, tch_sub,
- 0, 0, tn
- );
-
- dsp_load_rx_task(TCHD_DSP_TASK, 0, tsc); /* burst_id unused for TCH */
- dsp_load_tx_task(TCHD_DSP_TASK, 0, tsc); /* burst_id unused for TCH */
-
- return 0;
-}
-
-const struct tdma_sched_item tch_d_sched_set[] = {
- SCHED_ITEM_DT(l1s_tch_d_cmd, 0, 0, 0), SCHED_END_FRAME(),
- SCHED_END_FRAME(),
- SCHED_ITEM(l1s_tch_d_resp, 0, 0, -4), SCHED_END_FRAME(),
- SCHED_END_SET()
-};
-
-
-/* -------------------------------------------------------------------------
- * TCH: SACCH
- * ------------------------------------------------------------------------- */
-
-/*
- * SACCH data are spread over 4 bursts, however they are so far appart that
- * we can't use the normal scheduler to schedule all them at once in a single
- * set.
- * Therefore, the task code itself decides in which burst it is, if it's the
- * start/end, and act appropriately.
- */
-
-
-struct l1s_rx_tch_a_state {
- struct l1s_meas_hdr meas[4];
-
- struct msgb *msg;
- struct l1ctl_info_dl *dl;
- struct l1ctl_data_ind *di;
-};
-
-static struct l1s_rx_tch_a_state rx_tch_a;
-
-
-static int l1s_tch_a_resp(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- uint8_t mf_task_id = p3 & 0xff;
- struct gsm_time rx_time;
- uint8_t chan_nr;
- uint16_t arfcn;
- uint8_t tsc, tn;
- uint8_t tch_f_hn, tch_sub;
- uint32_t fn_report;
- uint8_t burst_id;
-
- /* It may happen we've never gone through cmd(0) yet, skip until then */
- if (!rx_tch_a.msg)
- goto skip;
-
- /* Get/compute various parameters */
- gsm_fn2gsmtime(&rx_time, (l1s.current_time.fn - 1 + GSM_MAX_FN) % GSM_MAX_FN);
- rfch_get_params(&rx_time, &arfcn, &tsc, &tn);
- chan_nr = mframe_task2chan_nr(mf_task_id, tn);
- tch_get_params(&rx_time, chan_nr, &fn_report, &tch_f_hn, &tch_sub, NULL);
- burst_id = (fn_report - 12) / 26;
-
- /* Collect measurements */
- rx_tch_a.meas[burst_id].toa_qbit = dsp_api.db_r->a_serv_demod[D_TOA];
- rx_tch_a.meas[burst_id].pm_dbm8 =
- agc_inp_dbm8_by_pm(dsp_api.db_r->a_serv_demod[D_PM] >> 3);
- rx_tch_a.meas[burst_id].freq_err =
- ANGLE_TO_FREQ(dsp_api.db_r->a_serv_demod[D_ANGLE]);
- rx_tch_a.meas[burst_id].snr = dsp_api.db_r->a_serv_demod[D_SNR];
-
- /* feed computed frequency error into AFC loop */
- if (rx_tch_a.meas[burst_id].snr > AFC_SNR_THRESHOLD)
- afc_input(rx_tch_a.meas[burst_id].freq_err, arfcn, 1);
- else
- afc_input(rx_tch_a.meas[burst_id].freq_err, arfcn, 0);
-
- /* feed computed TOA into TA loop */
- toa_input(rx_tch_a.meas[burst_id].toa_qbit << 2, rx_tch_a.meas[burst_id].snr);
-
- /* Tell the RF frontend to set the gain appropriately */
- rffe_compute_gain(rx_tch_a.meas[burst_id].pm_dbm8 / 8,
- CAL_DSP_TGT_BB_LVL);
-
- /* Last burst, read data & send to the up layer */
- if ((burst_id == 3) && (dsp_api.ndb->a_cd[0] & (1<<B_BLUD))) {
- unsigned int i;
- uint16_t num_biterr;
- uint32_t avg_snr = 0;
- int32_t avg_dbm8 = 0;
-
- /* Average SNR & RX level + error & crc status */
- for (i=0; i<4; i++) {
- avg_snr += rx_tch_a.meas[i].snr;
- avg_dbm8 += rx_tch_a.meas[i].pm_dbm8;
- }
- rx_tch_a.dl->snr = avg_snr / 4;
- rx_tch_a.dl->rx_level = dbm2rxlev(avg_dbm8 / (8*4));
-
- num_biterr = dsp_api.ndb->a_cd[2];
- if (num_biterr > 0xff)
- rx_tch_a.dl->num_biterr = 0xff;
- else
- rx_tch_a.dl->num_biterr = num_biterr;
-
- rx_tch_a.dl->fire_crc = ((dsp_api.ndb->a_cd[0] & 0xffff) & ((1 << B_FIRE1) | (1 << B_FIRE0))) >> B_FIRE0;
-
- /* Update rx level for pm report */
- pu_update_rx_level(rx_tch_a.dl->rx_level);
-
- /* Copy actual data, skipping the information block [0,1,2] */
- dsp_memcpy_from_api(rx_tch_a.di->data, &dsp_api.ndb->a_cd[3], 23, 0);
-
- /* Give message to up layer */
- l1_queue_for_l2(rx_tch_a.msg);
- rx_tch_a.msg = NULL; rx_tch_a.dl = NULL; rx_tch_a.di = NULL;
-
- /* Reset header */
- dsp_api.ndb->a_cd[0] = (1<<B_FIRE1);
- dsp_api.ndb->a_cd[2] = 0xffff;
- }
-
-skip:
- /* mark READ page as being used */
- dsp_api.r_page_used = 1;
-
- return 0;
-}
-
-static int l1s_tch_a_cmd(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
-{
- uint8_t mf_task_id = p3 & 0xff;
- uint8_t chan_nr;
- uint16_t arfcn;
- uint8_t tsc, tn;
- uint8_t tch_f_hn, tch_sub, tch_mode;
- uint32_t fn_report;
- uint8_t burst_id;
-
- /* Get/compute various parameters */
- rfch_get_params(&l1s.next_time, &arfcn, &tsc, &tn);
- chan_nr = mframe_task2chan_nr(mf_task_id, tn);
- tch_get_params(&l1s.next_time, chan_nr, &fn_report, &tch_f_hn, &tch_sub, &tch_mode);
- burst_id = (fn_report - 12) / 26;
-
- /* Load SACCH data if we start a new burst */
- if (burst_id == 0) {
- uint16_t *info_ptr = dsp_api.ndb->a_cu;
- struct msgb *msg;
- const uint8_t *data;
-
- /* If the TX queue is empty, send dummy measurement */
- msg = msgb_dequeue(&l1s.tx_queue[L1S_CHAN_SACCH]);
- data = msg ? msg->l3h : pu_get_meas_frame();
-
- /* Fill data block header */
- info_ptr[0] = (1 << B_BLUD); /* 1st word: Set B_BLU bit. */
- info_ptr[1] = 0; /* 2nd word: cleared. */
- info_ptr[2] = 0; /* 3nd word: cleared. */
-
- /* Copy the actual data after the header */
- dsp_memcpy_to_api(&info_ptr[3], data, 23, 0);
-
- /* Indicate completion (FIXME: early but easier this way for now) */
- if (msg) {
- last_tx_tch_fn = l1s.next_time.fn;
- last_tx_tch_type |= TX_TYPE_SACCH;
- l1s_compl_sched(L1_COMPL_TX_TCH);
- }
-
- /* Free msg now that we're done with it */
- if (msg)
- msgb_free(msg);
- }
-
- /* Allocate RX burst */
- if (burst_id == 0) {
- /* Clear 'dangling' msgb */
- if (rx_tch_a.msg) {
- /* Can happen if the task was shutdown in the middle of
- * 4 bursts ... */
- msgb_free(rx_tch_a.msg);
- }
-
- /* Allocate burst */
- /* FIXME: we actually want all allocation out of L1S! */
- rx_tch_a.msg = l1ctl_msgb_alloc(L1CTL_DATA_IND);
- if (!rx_tch_a.msg)
- printf("tch_a_cmd(0): unable to allocate msgb\n");
-
- rx_tch_a.dl = (struct l1ctl_info_dl *) msgb_put(rx_tch_a.msg, sizeof(*rx_tch_a.dl));
- rx_tch_a.di = (struct l1ctl_data_ind *) msgb_put(rx_tch_a.msg, sizeof(*rx_tch_a.di));
-
- /* Pre-fill DL header with some info about burst(0) */
- rx_tch_a.dl->chan_nr = chan_nr;
- rx_tch_a.dl->link_id = 0x40; /* SACCH */
- rx_tch_a.dl->band_arfcn = htons(arfcn);
- rx_tch_a.dl->frame_nr = htonl(l1s.next_time.fn);
- }
-
- /* Configure DSP for TX/RX */
- l1s_tx_apc_helper(arfcn);
-
- dsp_load_tch_param(
- &l1s.next_time,
- tch_mode, tch_f_hn ? TCH_F : TCH_H, tch_sub,
- 0, 0, tn
- );
-
- dsp_load_rx_task(TCHA_DSP_TASK, 0, tsc); /* burst_id unused for TCHA */
- l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB, 0);
-
- dsp_load_tx_task(TCHA_DSP_TASK, 0, tsc); /* burst_id unused for TCHA */
- l1s_tx_win_ctrl(arfcn, L1_TXWIN_NB, 0, 3);
-
- return 0;
-}
-
-
-const struct tdma_sched_item tch_a_sched_set[] = {
- SCHED_ITEM_DT(l1s_tch_a_cmd, 0, 0, 0), SCHED_END_FRAME(),
- SCHED_END_FRAME(),
- SCHED_ITEM(l1s_tch_a_resp, 0, 0, -4), SCHED_END_FRAME(),
- SCHED_END_SET()
-};