1 /* Layer 1 Random Access Channel Burst */
3 /* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
4 * (C) 2010 by Harald Welte <laforge@gnumonks.org>
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.
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.
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.
32 #include <byteorder.h>
33 #include <osmocore/gsm_utils.h>
34 #include <osmocore/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>
43 #include <layer1/sync.h>
44 #include <layer1/async.h>
45 #include <layer1/tdma_sched.h>
46 #include <layer1/tpu_window.h>
47 #include <layer1/l23_api.h>
49 #include <l1a_l23_interface.h>
56 /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
57 static int l1s_tx_rach_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3)
67 data[0] = l1s.serving_cell.bsic << 2;
68 data[1] = l1s.rach.ra;
70 info_ptr = &dsp_api.ndb->d_rach;
71 info_ptr[0] = ((uint16_t)(data[0])) | ((uint16_t)(data[1])<<8);
73 dsp_api.db_w->d_task_ra = RACH_DSP_TASK;
76 l1s_tx_win_ctrl(l1s.serving_cell.arfcn, L1_TXWIN_AB, 0);
82 /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
83 static int l1s_tx_rach_resp(__unused uint8_t p1, __unused uint8_t burst_id,
88 dsp_api.r_page_used = 1;
90 /* schedule a confirmation back indicating the GSM time at which
91 * the RACH burst was transmitted to the BTS */
92 last_rach.fn = l1s.current_time.fn - 1;
93 last_rach.band_arfcn = l1s.serving_cell.arfcn;
94 l1s_compl_sched(L1_COMPL_RACH);
99 /* sched sets for uplink */
100 const struct tdma_sched_item rach_sched_set_ul[] = {
101 SCHED_ITEM(l1s_tx_rach_cmd, 1, 0), SCHED_END_FRAME(),
103 SCHED_ITEM(l1s_tx_rach_resp, 1, 0), SCHED_END_FRAME(),
107 /* Asynchronous completion handler for FB detection */
108 static void l1a_rach_compl(__unused enum l1_compl c)
112 msg = l1_create_l2_msg(L1CTL_RACH_CONF, last_rach.fn, 0,
113 last_rach.band_arfcn);
114 l1_queue_for_l2(msg);
117 /* request a RACH request at the next multiframe T3 = fn51 */
118 void l1a_rach_req(uint8_t fn51, uint8_t ra)
124 /* TODO: can we wrap here? I don't think so */
125 fn_sched = l1s.current_time.fn - l1s.current_time.t3;
127 sched_gsmtime(rach_sched_set_ul, fn_sched, 0);
130 memset(&last_rach, 0, sizeof(last_rach));
133 static __attribute__ ((constructor)) void prim_rach_init(void)
135 l1s.completion[L1_COMPL_RACH] = &l1a_rach_compl;