From f7af19661a43457fc6489391ecc70aab238abcb4 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Fri, 9 Apr 2010 19:56:12 +0200
Subject: layer1: reorganize code, introduce prim_{pm,rach}.c

The new plan for layer1 is to structure the source code not based on
whether it is part of l1s/l1a or other parts, but based on 'primitives'.

All code that relates to transmitting a RACH burst should be in one
file, same for all code related to power management.  Those files are
called layer1/prim_*.c
---
 src/target/firmware/layer1/prim_rach.c | 109 +++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/target/firmware/layer1/prim_rach.c

(limited to 'src/target/firmware/layer1/prim_rach.c')

diff --git a/src/target/firmware/layer1/prim_rach.c b/src/target/firmware/layer1/prim_rach.c
new file mode 100644
index 00000000..886d70a3
--- /dev/null
+++ b/src/target/firmware/layer1/prim_rach.c
@@ -0,0 +1,109 @@
+/* Layer 1 Random Access Channel Burst */
+
+/* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
+ * (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/async.h>
+#include <layer1/tdma_sched.h>
+#include <layer1/tpu_window.h>
+#include <layer1/l23_api.h>
+
+#include <l1a_l23_interface.h>
+
+
+/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
+static int l1s_tx_rach_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3)
+{
+	int i;
+	uint16_t  *info_ptr;
+	uint8_t data[2];
+
+	putchart('T');
+
+	l1s_tx_apc_helper();
+
+	data[0] = l1s.serving_cell.bsic << 2;
+	data[1] = l1s.rach.ra;
+
+	info_ptr = &dsp_api.ndb->d_rach;
+	info_ptr[0] = ((uint16_t)(data[0])) | ((uint16_t)(data[1])<<8);
+
+	dsp_api.db_w->d_task_ra = RACH_DSP_TASK;
+	dsp_end_scenario();
+
+	l1s_tx_win_ctrl(l1s.serving_cell.arfcn, L1_TXWIN_AB, 0);
+	tpu_end_scenario();
+
+	return 0;
+}
+
+/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
+static int l1s_tx_rach_resp(__unused uint8_t p1, __unused uint8_t burst_id,
+			    __unused uint16_t p3)
+{
+	putchart('t');
+
+	dsp_api.r_page_used = 1;
+
+	return 0;
+}
+
+/* sched sets for uplink */
+const struct tdma_sched_item rach_sched_set_ul[] = {
+	SCHED_ITEM(l1s_tx_rach_cmd, 1, 0),				SCHED_END_FRAME(),
+									SCHED_END_FRAME(),
+	SCHED_ITEM(l1s_tx_rach_resp, 1, 0),				SCHED_END_FRAME(),
+	SCHED_END_SET()
+};
+
+/* request a RACH request at the next multiframe T3 = fn51 */
+void l1a_rach_req(uint8_t fn51, uint8_t ra)
+{
+	uint32_t fn_sched;
+
+	l1a_lock_sync();
+	l1s.rach.ra = ra;
+	/* TODO: can we wrap here? I don't think so */
+	fn_sched = l1s.current_time.fn - l1s.current_time.t3;
+	fn_sched += fn51;
+	sched_gsmtime(rach_sched_set_ul, fn_sched, 0);
+	l1a_unlock_sync();
+}
-- 
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