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/* TPU window control routines for Layer 1 */
/* (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 <debug.h>
#include <stdio.h>
#include <rffe.h>
#include <calypso/tpu.h>
#include <calypso/tsp.h>
#include <abb/twl3025.h>
#include <rf/trf6151.h>
#include <layer1/tpu_window.h>
/* all units in GSM quarter-bits (923.1ns) */
#define L1_TDMA_LENGTH_Q 5000
#define L1_BURST_LENGTH_Q 625 /* L1_TDMA_LENGTH_Q/8 */
#define L1_NB_MARGIN_Q (3 * 4)
#define L1_SB_MARGIN_Q (23 * 4)
#define L1_TAIL_DURATION_Q (3 * 4)
/* Sample length as required by the Calypso DSP */
#define L1_NB_DURATION_Q (L1_BURST_LENGTH_Q + 2 * L1_NB_MARGIN_Q - L1_TAIL_DURATION_Q)
#define L1_SB_DURATION_Q (L1_BURST_LENGTH_Q + 2 * L1_SB_MARGIN_Q - L1_TAIL_DURATION_Q)
#define L1_FB_DURATION_Q (11 * L1_TDMA_LENGTH_Q + 2057) /* more than 11 full slots */
#define L1_FB26_DURATION_Q (L1_TDMA_LENGTH_Q + 798)
#define L1_PW_DURATION_Q 289
#define DSP_SETUP_TIME 66
static const uint16_t rx_burst_duration[_NUM_L1_RXWIN] = {
[L1_RXWIN_PW] = L1_PW_DURATION_Q,
[L1_RXWIN_FB] = L1_FB_DURATION_Q,
[L1_RXWIN_SB] = L1_SB_DURATION_Q,
[L1_RXWIN_NB] = L1_NB_DURATION_Q,
};
#define L1_TX_NB_DURATION_Q 626
#define L1_TX_AB_DURATION_Q 386
static const uint16_t tx_burst_duration[_NUM_L1_TXWIN] = {
[L1_TXWIN_NB] = L1_TX_NB_DURATION_Q,
[L1_TXWIN_AB] = L1_TX_AB_DURATION_Q,
};
void l1s_rx_win_ctrl(uint16_t arfcn, enum l1_rxwin_type wtype)
{
int16_t start = DSP_SETUP_TIME;
int16_t stop = start + rx_burst_duration[wtype] - 1;
/* FIXME: AGC */
/* FIXME: RF PLL */
/* window open for TRF6151 */
/* FIXME: why do we need the magic value 100 ? */
rffe_mode(gsm_arfcn2band(arfcn), 0);
trf6151_rx_window(start - 100, arfcn, 40, 0);
/* Window open for ABB */
twl3025_downlink(1, start);
/* Delay 11 full TDMA frames */
if (wtype == L1_RXWIN_FB) {
uint8_t i;
for (i = 0; i < 11; i++)
tpu_enq_at(0);
stop -= 11 * L1_TDMA_LENGTH_Q;
}
/* Window close for ABB */
twl3025_downlink(0, stop);
/* window close for TRF6151 */
trf6151_set_mode(TRF6151_IDLE);
}
void l1s_tx_win_ctrl(uint16_t arfcn, enum l1_txwin_type wtype, uint8_t pwr)
{
/* uplink is three TS after downlink ( "+ 32" gives a TA of 1) */
uint16_t offset = (L1_BURST_LENGTH_Q * 3) + 28;
/* this is needed to cause a delay of one more TDMA frame,
* otherwise we have an off-by-one error and send the bursts
* at the wrong point in time, resulting in only 3 out of 4
* bursts arriving at the BTS */
tpu_enq_at(5000 - 10); /* TPU_CLOCK_RANGE - EPSILON_SYNC */
#ifdef CONFIG_TX_ENABLE
/* window open for TRF6151 and RFFE */
rffe_mode(gsm_arfcn2band(arfcn), 1);
trf6151_tx_window(offset, arfcn);
#endif
/* Window open for ABB */
twl3025_uplink(1, offset);
/* Window close for ABB */
twl3025_uplink(0, tx_burst_duration[wtype] + offset + 2); // TODO: "+ 2"
/* window close for TRF6151 and RFFE */
trf6151_set_mode(TRF6151_IDLE);
}
void tpu_end_scenario(void)
{
tpu_enq_sleep();
tpu_enable(1);
}
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