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/* Layer 1 Frequency redefinition at "starting time" */
/* (C) 2010 by Andreas Eversverg <jolly@eversberg.eu>
*
* 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 <inttypes.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>
struct {
uint32_t fn;
uint16_t band_arfcn;
} last_rach;
/* if the "starting time" is reached, use frequencies "after time" */
static int l1s_freq_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3)
{
putchart('F');
printf("Reached starting time, altering frequency set\n");
l1s.dedicated.tsc = l1s.dedicated.st_tsc;
l1s.dedicated.h = l1s.dedicated.st_h;
if (l1s.dedicated.h)
memcpy(&l1s.dedicated.h1, &l1s.dedicated.st_h1,
sizeof(l1s.dedicated.h1));
else
memcpy(&l1s.dedicated.h0, &l1s.dedicated.st_h0,
sizeof(l1s.dedicated.h0));
return 0;
}
/* sched set for frequency change */
const struct tdma_sched_item freq_sched_set[] = {
SCHED_ITEM(l1s_freq_cmd, -3, 1, 0),
SCHED_END_SET()
};
/* request a frequency change at the given frame number
* Note: The fn_sched parameter must be in range 0..42431. */
void l1a_freq_req(uint32_t fn_sched)
{
int32_t diff;
unsigned long flags;
/* We must check here, if the time already elapsed.
* This is required, because we may have an undefined delay between
* layer 1 and layer 3.
*/
diff = fn_sched - (l1s.current_time.fn % 42432);
if (diff < 0)
diff += 42432;
/* note: 5 is used to give scheduler some time */
if (diff == 5 || diff >= 32024) {
l1s_freq_cmd(0, 0, 0);
return;
}
/* calculate (full range) frame number */
fn_sched = l1s.current_time.fn + diff;
if (fn_sched >= GSM_MAX_FN)
fn_sched -= GSM_MAX_FN;
printf("Scheduling frequency change at fn=%"PRIu32", currently fn=%"PRIu32"\n",
fn_sched, l1s.current_time.fn);
local_firq_save(flags);
sched_gsmtime(freq_sched_set, fn_sched, 0);
local_irq_restore(flags);
}
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