src/target/firmware/layer1/prim_tx_nb.c

   1 /* Layer 1 - Transmit Normal Burst */
   2
   3 /* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
   4  * (C) 2010 by Harald Welte <laforge@gnumonks.org>
   5  *
   6  * All Rights Reserved
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24 #include <stdint.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28
  29 #include <defines.h>
  30 #include <debug.h>
  31 #include <memory.h>
  32 #include <byteorder.h>
  33 #include <osmocom/gsm/gsm_utils.h>
  34 #include <osmocom/core/msgb.h>
  35 #include <calypso/dsp_api.h>
  36 #include <calypso/irq.h>
  37 #include <calypso/tpu.h>
  38 #include <calypso/tsp.h>
  39 #include <calypso/dsp.h>
  40 #include <calypso/timer.h>
  41 #include <comm/sercomm.h>
  42
  43 #include <layer1/sync.h>
  44 #include <layer1/agc.h>
  45 #include <layer1/tdma_sched.h>
  46 #include <layer1/mframe_sched.h>
  47 #include <layer1/tpu_window.h>
  48 #include <layer1/l23_api.h>
  49 #include <layer1/rfch.h>
  50 #include <layer1/prim.h>
  51
  52 #include <l1ctl_proto.h>
  53
  54
  55 static uint32_t last_txnb_fn;
  56
  57 /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB) */
  58 static int l1s_tx_resp(__unused uint8_t p1, __unused uint8_t burst_id,
  59                        __unused uint16_t p3)
  60 {
  61         putchart('t');
  62
  63         dsp_api.r_page_used = 1;
  64
  65         if (burst_id == 3) {
  66                 last_txnb_fn = l1s.current_time.fn - 4;
  67                 l1s_compl_sched(L1_COMPL_TX_NB);
  68         }
  69
  70         return 0;
  71 }
  72
  73 /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB) */
  74 static int l1s_tx_cmd(uint8_t p1, uint8_t burst_id, uint16_t p3)
  75 {
  76         uint16_t arfcn;
  77         uint8_t tsc, tn;
  78         uint8_t mf_task_id = p3 & 0xff;
  79         uint8_t mf_task_flags = p3 >> 8;
  80
  81         putchart('T');
  82
  83         /* before sending first of the four bursts, copy data to API ram */
  84         if (burst_id == 0) {
  85                 uint16_t *info_ptr = dsp_api.ndb->a_cu;
  86                 struct msgb *msg;
  87                 const uint8_t *data;
  88
  89                 /* distinguish between DCCH and ACCH */
  90                 if (mf_task_flags & MF_F_SACCH) {
  91                         msg = msgb_dequeue(&l1s.tx_queue[L1S_CHAN_SACCH]);
  92                         data = msg ? msg->l3h : pu_get_meas_frame();
  93                 } else {
  94                         msg = msgb_dequeue(&l1s.tx_queue[L1S_CHAN_MAIN]);
  95                         data = msg ? msg->l3h : pu_get_idle_frame();
  96                 }
  97
  98                 /* Fill data block Header */
  99                 info_ptr[0] = (1 << B_BLUD);     // 1st word: Set B_BLU bit.
 100                 info_ptr[1] = 0;                 // 2nd word: cleared.
 101                 info_ptr[2] = 0;                 // 3rd word: cleared.
 102
 103                 /* Copy the actual data after the header */
 104                 dsp_memcpy_to_api(&info_ptr[3], data, 23, 0);
 105
 106                 if (msg)
 107                         msgb_free(msg);
 108         }
 109
 110         rfch_get_params(&l1s.next_time, &arfcn, &tsc, &tn);
 111
 112         l1s_tx_apc_helper(arfcn);
 113
 114         if (p1 == 0)
 115                 /* DUL_DSP_TASK, one normal burst */
 116                 dsp_load_tch_param(&l1s.next_time,
 117                                    SIG_ONLY_MODE, INVALID_CHANNEL, 0, 0, 0, tn);
 118
 119         else if (p1 == 2)
 120                 /* DUL_DSP_TASK, four normal bursts */
 121                 dsp_load_tch_param(&l1s.next_time,
 122                                    SIG_ONLY_MODE, SDCCH_4, 0, 0, 0, tn);
 123
 124         dsp_load_tx_task(DUL_DSP_TASK, burst_id, tsc);
 125
 126         l1s_tx_win_ctrl(arfcn | ARFCN_UPLINK, L1_TXWIN_NB, 0, 3);
 127
 128         return 0;
 129 }
 130
 131 /* Asynchronous completion handler for NB transmit */
 132 static void l1a_tx_nb_compl(__unused enum l1_compl c)
 133 {
 134         struct msgb *msg;
 135
 136         msg = l1_create_l2_msg(L1CTL_DATA_CONF, last_txnb_fn, 0, 0);
 137         l1_queue_for_l2(msg);
 138 }
 139
 140 void l1s_tx_test(uint8_t base_fn, uint8_t type)
 141 {
 142         printf("Starting TX %d\n", type);
 143
 144         if (type == 0) {// one normal burst
 145                 tdma_schedule(base_fn, &l1s_tx_cmd, 0, 0, 0, 3);
 146                 tdma_schedule(base_fn + 2, &l1s_tx_resp, 0, 0, 0, 3);
 147         } else if (type == 2) { // four normal bursts
 148                 tdma_schedule(base_fn, &l1s_tx_cmd, 2, 0, 0, 3);
 149                 tdma_schedule(base_fn + 1, &l1s_tx_cmd, 2, 1, 0, 3);
 150                 tdma_schedule(base_fn + 2, &l1s_tx_resp, 2, 0, 0, 3);
 151                 tdma_schedule(base_fn + 2, &l1s_tx_cmd, 2, 2, 0, 3);
 152                 tdma_schedule(base_fn + 3, &l1s_tx_resp, 2, 1, 0, 3);
 153                 tdma_schedule(base_fn + 3, &l1s_tx_cmd, 2, 3, 0, 3);
 154                 tdma_schedule(base_fn + 4, &l1s_tx_resp, 2, 2, 0, 3);
 155                 tdma_schedule(base_fn + 5, &l1s_tx_resp, 2, 3, 0, 3);
 156         }
 157 }
 158
 159 /* sched sets for uplink */
 160 const struct tdma_sched_item nb_sched_set_ul[] = {
 161         SCHED_ITEM_DT(l1s_tx_cmd, 3, 2, 0),                                             SCHED_END_FRAME(),
 162         SCHED_ITEM_DT(l1s_tx_cmd, 3, 2, 1),                                             SCHED_END_FRAME(),
 163         SCHED_ITEM(l1s_tx_resp, -4, 2, 0),      SCHED_ITEM_DT(l1s_tx_cmd, 3, 2, 2),     SCHED_END_FRAME(),
 164         SCHED_ITEM(l1s_tx_resp, -4, 2, 1),      SCHED_ITEM_DT(l1s_tx_cmd, 3, 2, 3),     SCHED_END_FRAME(),
 165                                                 SCHED_ITEM(l1s_tx_resp, -4, 2, 2),      SCHED_END_FRAME(),
 166                                                 SCHED_ITEM(l1s_tx_resp, -4, 2, 3),      SCHED_END_FRAME(),
 167         SCHED_END_SET()
 168 };
 169
 170 static __attribute__ ((constructor)) void prim_tx_nb_init(void)
 171 {
 172         l1s.completion[L1_COMPL_TX_NB] = &l1a_tx_nb_compl;
 173 }