phone-side
/
osmocom-bb
mirror of https://gerrit.osmocom.org/osmocom-bb
9
0
Fork 0
Code Issues Releases Wiki Activity
osmocom-bb/src/target/firmware/layer1/prim_tch.c

819 lines
22 KiB
C
Raw Blame History

/* 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/codec/codec.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>
static inline int msb_get_bit(uint8_t *buf, int bn)
{
int pos_byte = bn >> 3;
int pos_bit = 7 - (bn & 7);
return (buf[pos_byte] >> pos_bit) & 1;
}
static inline void msb_set_bit(uint8_t *buf, int bn, int bit)
{
int pos_byte = bn >> 3;
int pos_bit = 7 - (bn & 7);
buf[pos_byte] |= (bit << pos_bit);
}
static void tch_fr_bit_magic(uint8_t *frame, int dl)
{
uint8_t fr[33];
int i, di, si;
memset(fr, 0x00, 33);
if (dl)
fr[0] = 0xd0;
for (i = 0; i < 260; i++) {
di = gsm610_bitorder[i];
si = (i > 181) ? i + 4 : i;
if (dl)
msb_set_bit(fr, 4 + di, msb_get_bit(frame, si));
else
msb_set_bit(fr, si, msb_get_bit(frame, 4 + di));
}
memcpy(frame, fr, 33);
}
/* 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;
uint8_t *payload;
/* 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));
payload = (uint8_t *) msgb_put(msg, 33);
/* Copy actual data, skipping the information block [0,1,2] */
dsp_memcpy_from_api(payload, &traffic_buf[3], 33, 1);
/**
* Perform some bit conversations
* FIXME: what about other (than FR) codecs?
*/
tch_fr_bit_magic(payload, 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]);
/**
* Perform some bit conversations
* FIXME: what about other (than FR) codecs?
*/
if (msg)
tch_fr_bit_magic(msg->l2h, 0);
/* 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(
dsp_task_iq_swap(TCHT_DSP_TASK, arfcn, 0),
0, tsc /* burst_id unused for TCH */
);
l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB, 0);
dsp_load_tx_task(
dsp_task_iq_swap(TCHT_DSP_TASK, arfcn, 1),
0, tsc /* burst_id unused for TCH */
);
l1s_tx_win_ctrl(arfcn | ARFCN_UPLINK, 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 apart 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(
dsp_task_iq_swap(TCHA_DSP_TASK, arfcn, 0),
0, tsc /* burst_id unused for TCHA */
);
l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB, 0);
dsp_load_tx_task(
dsp_task_iq_swap(TCHA_DSP_TASK, arfcn, 1),
0, tsc /* burst_id unused for TCHA */
);
l1s_tx_win_ctrl(arfcn | ARFCN_UPLINK, 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()
};
View Git Blame Copy Permalink