start copying kernel bits

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@4315 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 134 insertions, 0 deletions

diff --git a/drivers/dahdi/xpp/xbus-pcm.h b/drivers/dahdi/xpp/xbus-pcm.h
new file mode 100644
index 0000000..3265f68
--- /dev/null
+++ b/drivers/dahdi/xpp/xbus-pcm.h
@@ -0,0 +1,134 @@
+/*
+ * Written by Oron Peled <oron@actcom.co.il>
+ * Copyright (C) 2004-2007, Xorcom
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ * This source module contains all the PCM and SYNC handling code.
+ */
+#ifndef	XBUS_PCM_H
+#define	XBUS_PCM_H
+
+#include "xdefs.h"
+#include <linux/proc_fs.h>
+#include <zaptel.h>
+
+#ifdef	__KERNEL__
+
+enum sync_mode {
+	SYNC_MODE_NONE	= 0x00,
+	SYNC_MODE_AB	= 0x01,		/* Astribank sync */
+	SYNC_MODE_PLL	= 0x03,		/* Adjust XPD's PLL according to HOST */
+	SYNC_MODE_QUERY	= 0x80,
+};
+
+/*
+ * Abstract representation of timestamp.
+ * It would (eventually) replace the hard-coded
+ * timeval structs so we can migrate to better
+ * time representations.
+ */
+struct xpp_timestamp {
+	struct timeval	tv;
+};
+
+/*
+ * A ticker encapsulates the timing information of some
+ * abstract tick source. The following tickers are used:
+ *   - Each xbus has an embedded ticker.
+ *   - There is one global zaptel_ticker to represent ticks
+ *     of external zaptel card (in case we want to sync
+ *     from other zaptel devices).
+ */
+struct xpp_ticker {		/* for rate calculation */
+	int			count;
+	int			cycle;
+	struct xpp_timestamp	first_sample;
+	struct xpp_timestamp	last_sample;
+	int			tick_period;	/* usec/tick */
+	spinlock_t		lock;
+};
+
+/*
+ * xpp_drift represent the measurements of the offset between an
+ * xbus ticker to a reference ticker.
+ */
+struct xpp_drift {
+	int			wanted_offset;		/* fixed */
+	int			delta_tick;		/* from ref_ticker */
+	int			lost_ticks;		/* occurances */
+	int			lost_tick_count;
+	int			delta_max;
+	int			delta_min;
+	int			median;			/* (max + min) / 2	*/
+	int			jitter;			/* max - min		*/
+	int			calc_drift;
+	spinlock_t		lock;
+};
+
+void xpp_drift_init(xbus_t *xbus);
+
+static inline long usec_diff(const struct timeval *tv1, const struct timeval *tv2)
+{
+	long			diff_sec;
+	long			diff_usec;
+
+	diff_sec = tv1->tv_sec - tv2->tv_sec;
+	diff_usec = tv1->tv_usec - tv2->tv_usec;
+	return diff_sec * 1000000 + diff_usec;
+}
+
+
+int		xbus_pcm_init(struct proc_dir_entry *top);
+void		xbus_pcm_shutdown(void);
+int		send_pcm_frame(xbus_t *xbus, xframe_t *xframe);
+void		pcm_recompute(xpd_t *xpd, xpp_line_t tmp_pcm_mask);
+void		__pcm_recompute(xpd_t *xpd, xpp_line_t tmp_pcm_mask); /* non locking */
+void		xframe_receive_pcm(xbus_t *xbus, xframe_t *xframe);
+void		generic_card_pcm_fromspan(xbus_t *xbus, xpd_t *xpd, xpp_line_t lines, xpacket_t *pack);
+void		generic_card_pcm_tospan(xbus_t *xbus, xpd_t *xpd, xpacket_t *pack);
+void		fill_beep(u_char *buf, int num, int duration);
+const char	*sync_mode_name(enum sync_mode mode);
+void		xbus_set_command_timer(xbus_t *xbus, bool on);
+void		xbus_request_sync(xbus_t *xbus, enum sync_mode mode);
+void		got_new_syncer(xbus_t *xbus, enum sync_mode mode, int drift);
+int		xbus_command_queue_tick(xbus_t *xbus);
+void		xbus_reset_counters(xbus_t *xbus);
+void		elect_syncer(const char *msg);
+int		xpp_echocan(struct zt_chan *chan, int len);
+#ifdef	ZAPTEL_SYNC_TICK
+int		zaptel_sync_tick(struct zt_span *span, int is_master);
+#endif
+
+#ifdef	XPP_EC_CHUNK
+extern int xpp_ec;
+#else
+#define	xpp_ec	0
+#endif
+
+#ifdef	DEBUG_PCMTX
+extern int	pcmtx;
+extern int	pcmtx_chan;
+#endif
+
+#endif	/* __KERNEL__ */
+
+#endif	/* XBUS_PCM_H */
+