/* Layer 1 Power Measurement */

/* (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 <osmocore/gsm_utils.h>
#include <osmocore/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 <layer1/sync.h>
#include <layer1/agc.h>
#include <layer1/tdma_sched.h>
#include <layer1/tpu_window.h>
#include <layer1/l23_api.h>

#include <l1a_l23_interface.h>

static void l1ddsp_meas_read(uint8_t nbmeas, uint16_t *pm)
{
	uint8_t i;

	for (i = 0; i < nbmeas; i++)
		pm[i] = (uint16_t) ((dsp_api.db_r->a_pm[i] & 0xffff) >> 3);
	dsp_api.r_page_used = 1;
}

/* scheduler callback to issue a power measurement task to the DSP */
static int l1s_pm_cmd(uint8_t num_meas,
		      __unused uint8_t p2, uint16_t arfcn)
{
	putchart('P');

	dsp_api.db_w->d_task_md = num_meas; /* number of measurements */
	dsp_api.ndb->d_fb_mode = 0; /* wideband search */
	dsp_end_scenario();

	/* Tell the RF frontend to set the gain appropriately */
	rffe_set_gain(-85, CAL_DSP_TGT_BB_LVL);

	/* Program TPU */
	/* FIXME: RXWIN_PW needs to set up multiple times in case
	 * num_meas > 1 */
	l1s_rx_win_ctrl(arfcn, L1_RXWIN_PW, 0);
	//l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB);
	tpu_end_scenario();

	return 0;
}

/* scheduler callback to read power measurement resposnse from the DSP */
static int l1s_pm_resp(uint8_t num_meas, __unused uint8_t p2,
		       uint16_t arfcn)
{
	struct l1ctl_pm_conf *pmr;
	uint16_t pm_level[2];

	putchart('p');

	l1ddsp_meas_read(num_meas, pm_level);

	printf("PM MEAS: ARFCN=%u, %-4d dBm at baseband, %-4d dBm at RF\n",
		arfcn, pm_level[0]/8, agc_inp_dbm8_by_pm(pm_level[0])/8);

	printd("PM MEAS: %-4d dBm, %-4d dBm ARFCN=%u\n",
		agc_inp_dbm8_by_pm(pm_level[0])/8,
		agc_inp_dbm8_by_pm(pm_level[1])/8, arfcn);

	if (!l1s.pm.msg)
		l1s.pm.msg = l1ctl_msgb_alloc(L1CTL_PM_CONF);

	if (msgb_tailroom(l1s.pm.msg) < sizeof(*pmr)) {
		/* flush current msgb */
		l1_queue_for_l2(l1s.pm.msg);
		/* allocate a new msgb and initialize header */
		l1s.pm.msg = l1ctl_msgb_alloc(L1CTL_PM_CONF);
	}

	pmr = msgb_put(l1s.pm.msg, sizeof(*pmr));
	pmr->band_arfcn = htons(arfcn);
	/* FIXME: do this as RxLev rather than DBM8 ? */
	pmr->pm[0] = dbm2rxlev(agc_inp_dbm8_by_pm(pm_level[0])/8);
	if (num_meas > 1)
		pmr->pm[1] = dbm2rxlev(agc_inp_dbm8_by_pm(pm_level[1])/8);
	else
		pmr->pm[1] = 0;

	if (l1s.pm.mode == 1) {
		if (l1s.pm.range.arfcn_next <= l1s.pm.range.arfcn_end) {
			/* schedule PM for next ARFCN in range */
			l1s_pm_test(1, l1s.pm.range.arfcn_next);
			l1s.pm.range.arfcn_next++;
		} else {
			/* we have finished, flush the msgb to L2 */
			struct l1ctl_hdr *l1h = l1s.pm.msg->l1h;
			l1h->flags |= L1CTL_F_DONE;
			l1_queue_for_l2(l1s.pm.msg);
			l1s.pm.msg = NULL;
		}
	}

	return 0;
}

static const struct tdma_sched_item pm_sched_set[] = {
	SCHED_ITEM(l1s_pm_cmd, 1, 0),		SCHED_END_FRAME(),
						SCHED_END_FRAME(),
	SCHED_ITEM(l1s_pm_resp, 1, 0),		SCHED_END_FRAME(),
	SCHED_END_SET()
};

/* Schedule a power measurement test */
void l1s_pm_test(uint8_t base_fn, uint16_t arfcn)
{
	printd("l1s_pm_test(%u, %u)\n", base_fn, arfcn);
	tdma_schedule_set(base_fn, pm_sched_set, arfcn);
}