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/* Layer 1 Random Access Channel Burst */
/* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* 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/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 <asm/system.h>
#include <layer1/sync.h>
#include <layer1/async.h>
#include <layer1/tdma_sched.h>
#include <layer1/tpu_window.h>
#include <layer1/l23_api.h>
#include <layer1/sched_gsmtime.h>
#include <l1ctl_proto.h>
int hando_access_flag = 0;
int16_t hando_arfcn = 0;
int ho_flag = 0;
struct {
uint32_t fn;
uint16_t band_arfcn;
} last_rach;
/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
static int l1s_tx_rach_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3)
{
uint16_t *info_ptr;
uint16_t arfcn;
uint8_t tsc, tn;
uint8_t data[2];
putchart('T');
if (hando_access_flag == 1)
arfcn = hando_arfcn;
else
arfcn = l1s.serving_cell.arfcn;
//l1s_tx_apc_helper(l1s.serving_cell.arfcn);
l1s_tx_apc_helper(arfcn);
data[0] = l1s.serving_cell.bsic << 2;
data[1] = l1s.rach.ra;
info_ptr = &dsp_api.ndb->d_rach;
info_ptr[0] = ((uint16_t)(data[0])) | ((uint16_t)(data[1])<<8);
//rfch_get_params(&l1s.next_time, &arfcn, &tsc, &tn); //MTZ - ADDED LATER - POSSIBLY REMOVE
//hando_access_flag = 0;
printf("\n\nMTZ - arfcn in l1s_tx_rach_cmd = %d, serving cell arfcn = %d\n\n", arfcn, l1s.serving_cell.arfcn);
dsp_api.db_w->d_task_ra = dsp_task_iq_swap(RACH_DSP_TASK, arfcn, 1);
l1s_tx_win_ctrl(arfcn | ARFCN_UPLINK, L1_TXWIN_AB, 0, 3);
return 0;
}
/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
static int l1s_tx_rach_resp(__unused uint8_t p1, __unused uint8_t burst_id,
__unused uint16_t p3)
{
uint16_t arfcn;
if (hando_access_flag == 1)
arfcn = hando_arfcn;
else
arfcn = l1s.serving_cell.arfcn;
hando_access_flag = 0;
putchart('t');
dsp_api.r_page_used = 1;
if (ho_flag == 1) {
ho_flag = 0;
int ii = 0;
for (ii =0; ii<64; ii++) {
if (l1s.tpu_offsets_arfcn[ii] == arfcn) {
if (l1s.nb_sb_snr[ii] > 0)
afc_input(l1s.nb_sb_freq_diff[ii], arfcn, 1);
else
afc_input(l1s.nb_sb_freq_diff[ii], arfcn, 0);
//mframe_disable(MF_TASK_TCH_F_EVEN);
//mframe_disable(MF_TASK_TCH_F_ODD);
//mframe_disable(MF_TASK_TCH_H_0);
//mframe_disable(MF_TASK_TCH_H_1);
//mframe_disable(MF_TASK_NEIGH_PM51_C0T0);
//mframe_disable(MF_TASK_NEIGH_PM51);
//mframe_disable(MF_TASK_NEIGH_PM26E);
//mframe_disable(MF_TASK_NEIGH_PM26O);
//mframe_enable(MF_TASK_BCCH_NORM);
}
}
}
/* schedule a confirmation back indicating the GSM time at which
* the RACH burst was transmitted to the BTS */
last_rach.fn = l1s.current_time.fn - 1;
last_rach.band_arfcn = arfcn;
l1s_compl_sched(L1_COMPL_RACH);
return 0;
}
/* sched sets for uplink */
const struct tdma_sched_item rach_sched_set_ul[] = {
SCHED_ITEM_DT(l1s_tx_rach_cmd, 3, 1, 0), SCHED_END_FRAME(),
SCHED_END_FRAME(),
SCHED_ITEM(l1s_tx_rach_resp, -4, 1, 0), SCHED_END_FRAME(),
SCHED_END_SET()
};
/* Asynchronous completion handler for FB detection */
static void l1a_rach_compl(__unused enum l1_compl c)
{
struct msgb *msg;
printf("\n\nMTZ: L1CTL_RACH_CONF message being sent!\n\n\n");
msg = l1_create_l2_msg(L1CTL_RACH_CONF, last_rach.fn, 0,
last_rach.band_arfcn);
l1_queue_for_l2(msg);
}
static uint8_t t3_to_rach_comb[51] = {
0, 0, 0, 0,
0, 1,
2, 2, 2, 2, 2, 2, 2, 2,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 25, 25, 25, 25, 25, 25, 25,
25, 26,
27, 27, 27, 27};
static uint8_t rach_to_t3_comb[27] = {
4, 5,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
45, 46};
/* schedule access burst */
void l1a_rach_req(uint16_t offset, uint8_t combined, uint8_t ra, uint16_t arfcn)
{
uint32_t fn_sched;
unsigned long flags;
if (arfcn > 0) {
hando_arfcn = arfcn;
hando_access_flag = 1;
//printf("\n\n\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\nMTZ: CP1\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n\n\n");
uint32_t new_fn;
if (l1s.new_dm) {
int ii = 0;
for (ii =0; ii<64; ii++) {
if (l1s.tpu_offsets_arfcn[ii] == arfcn) {
printf("\n\n\n\n\n\n\n-------------------------------------------\n\n\n\n\nMTZ: SYNCHING TO NEW ARFCN %d\n\n\n\n\n-------------------------------------------\n\n\n\n\n\n\n\n", arfcn);
//printf("\n\n\n\n\n\n\n\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n!!!!!!!!!!!!!MTZ: SYNCHING TO NEW ARFCN %d (offset=%d, freq_diff=%d, sb_fb_freq_diff=%d, sb_snr=%d, frame_diff=%d)!!!!!!!!!\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n\n\n\n\n\n\n\n\n", arfcn, l1s.tpu_offsets[ii], l1s.nb_freq_diff[ii], l1s.nb_sb_freq_diff[ii], l1s.nb_sb_snr[ii], l1s.nb_frame_diff[ii]);
//MTZ - Setting tpu_offset for frame start synchronization as well as doing frequency compensation
l1s.orig_tpu_offset = l1s.tpu_offset;
l1s.tpu_offset = l1s.tpu_offsets[ii];
afc_correct(l1s.nb_freq_diff[ii], arfcn);
//if (l1s.nb_sb_snr[ii] > 0)
// afc_input(l1s.nb_sb_freq_diff[ii], arfcn, 1);
//else
// afc_input(l1s.nb_sb_freq_diff[ii], arfcn, 0);
//MTZ - Setting frame number using the difference computed before
new_fn = l1s.current_time.fn + l1s.nb_frame_diff[ii];
while (new_fn < 0)
new_fn += 2715647;
new_fn = new_fn % 2715647;
gsm_fn2gsmtime(&l1s.current_time, new_fn);
/* compute next time from new current time */
l1s.next_time = l1s.current_time;
l1s_time_inc(&l1s.next_time, 1);
tdma_sched_reset();
ho_flag = 1;
}
}
l1s.new_dm = 0;
}
}
offset += 3;
//printf("\n\nMTZ: In l1a_rach_req, serving cell = %d\n\n", l1s.serving_cell.arfcn);
local_firq_save(flags);
if (l1s.dedicated.type == GSM_DCHAN_TCH_F) {
fn_sched = l1s.current_time.fn + offset;
/* go next DCCH frame TCH/F channel */
if ((fn_sched % 13) == 12)
fn_sched++;
} else if (l1s.dedicated.type == GSM_DCHAN_TCH_H) {
fn_sched = l1s.current_time.fn + offset;
/* go next DCCH frame of TCH/H channel */
if ((fn_sched % 13) == 12)
fn_sched++;
if ((l1s.dedicated.chan_nr & 1) != ((fn_sched % 13) & 1))
fn_sched++;
} else if (combined) {
/* add elapsed RACH slots to offset */
offset += t3_to_rach_comb[l1s.current_time.t3];
/* offset is the number of RACH slots in the future */
fn_sched = l1s.current_time.fn - l1s.current_time.t3;
fn_sched += offset / 27 * 51;
fn_sched += rach_to_t3_comb[offset % 27];
} else
fn_sched = l1s.current_time.fn + offset;
l1s.rach.ra = ra;
fn_sched %= 2715648;
sched_gsmtime(rach_sched_set_ul, fn_sched, 0);
local_irq_restore(flags);
memset(&last_rach, 0, sizeof(last_rach));
}
static __attribute__ ((constructor)) void prim_rach_init(void)
{
l1s.completion[L1_COMPL_RACH] = &l1a_rach_compl;
}
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