1 files changed, 94 insertions, 0 deletions
diff --git a/src/target/firmware/layer1/tpu_window.c b/src/target/firmware/layer1/tpu_window.c
new file mode 100644
index 00000000..dc9fc34a
--- /dev/null
+++ b/src/target/firmware/layer1/tpu_window.c
@@ -0,0 +1,94 @@
+/* TPU window control routines for Layer 1 */
+
+/* (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 <debug.h>
+#include <stdio.h>
+
+#include <rffe.h>
+#include <calypso/tpu.h>
+#include <calypso/tsp.h>
+#include <abb/twl3025.h>
+#include <rf/trf6151.h>
+
+#include <layer1/tpu_window.h>
+
+/* all units in GSM quarter-bits (923.1ns) */
+#define L1_TDMA_LENGTH_Q	5000
+#define L1_BURST_LENGTH_Q	625	/* L1_TDMA_LENGTH_Q/8 */
+
+#define L1_NB_MARGIN_Q		(3 * 4)
+#define L1_SB_MARGIN_Q		(23 * 4)
+#define L1_TAIL_DURATION_Q	(3 * 4)
+
+/* Sample length as required by the Calypso DSP */
+#define L1_NB_DURATION_Q	(L1_BURST_LENGTH_Q + 2 * L1_NB_MARGIN_Q - L1_TAIL_DURATION_Q)
+#define L1_SB_DURATION_Q	(L1_BURST_LENGTH_Q + 2 * L1_SB_MARGIN_Q - L1_TAIL_DURATION_Q)
+#define L1_FB_DURATION_Q	(11 * L1_TDMA_LENGTH_Q + 2057)	/* more than 11 full slots */
+#define L1_FB26_DURATION_Q	(L1_TDMA_LENGTH_Q + 798)
+#define	L1_PW_DURATION_Q	289
+
+#define DSP_SETUP_TIME		66
+
+static const uint16_t rx_burst_duration[_NUM_L1_RXWIN] = {
+	[L1_RXWIN_PW]	= L1_PW_DURATION_Q,
+	[L1_RXWIN_FB]	= L1_FB_DURATION_Q,
+	[L1_RXWIN_SB]	= L1_SB_DURATION_Q,
+	[L1_RXWIN_NB]	= L1_NB_DURATION_Q,
+};
+
+void l1s_rx_win_ctrl(uint16_t arfcn, enum l1_rxwin_type wtype)
+{
+	int16_t start = DSP_SETUP_TIME;
+	int16_t stop = start + rx_burst_duration[wtype] - 1;
+
+	/* FIXME: AGC */
+	/* FIXME: RF PLL */
+
+	/* window open for TRF6151 */
+	/* FIXME: why do we need the magic value 100 ? */
+	rffe_mode(gsm_arfcn2band(arfcn), 0);
+	trf6151_rx_window(start - 100, arfcn, 40, 0);
+
+	/* Window open for ABB */
+	twl3025_downlink(1, start);
+
+	/* Delay 11 full TDMA frames */
+	if (wtype == L1_RXWIN_FB) {
+		uint8_t i;
+		for (i = 0; i < 11; i++)
+			tpu_enq_at(0);
+
+		stop -= 11 * L1_TDMA_LENGTH_Q;
+	}
+
+	/* Window close for ABB */
+	twl3025_downlink(0, stop);
+
+	/* FIXME: window close for TRF6151 */
+}
+
+void tpu_end_scenario(void)
+{
+	tpu_enq_sleep();
+	tpu_enable(1);
+}