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/*
* 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 <dahdi/kernel.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 dahdi_ticker to represent ticks
* of external dahdi card (in case we want to sync
* from other dahdi 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 xframe_receive_pcm(xbus_t *xbus, xframe_t *xframe);
void generic_card_pcm_recompute(xbus_t *xbus, xpd_t *xpd, xpp_line_t pcm_mask);
void generic_card_pcm_fromspan(xbus_t *xbus, xpd_t *xpd, 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 exec_sync_command(const char *buf, size_t count);
int fill_sync_string(char *buf, size_t count);
#ifdef DAHDI_SYNC_TICK
int dahdi_sync_tick(struct dahdi_span *span, int is_master);
#endif
#ifdef DEBUG_PCMTX
extern int pcmtx;
extern int pcmtx_chan;
#endif
#endif /* __KERNEL__ */
#endif /* XBUS_PCM_H */
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