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NetBSD/sys/dev/ic/isic_bchan.c

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/*
* Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* i4b_bchan.c - B channel handling L1 procedures
* ----------------------------------------------
*
* $Id: isic_bchan.c,v 1.3 2001/03/25 14:38:23 is Exp $
*
* last edit-date: [Fri Jan 5 11:36:11 2001]
*
*---------------------------------------------------------------------------*/
#include <sys/param.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <sys/ioccom.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <machine/stdarg.h>
#ifdef __FreeBSD__
#include <machine/clock.h>
#include <i386/isa/isa_device.h>
#else
#ifndef __bsdi__
#include <machine/bus.h>
#endif
#include <sys/device.h>
#endif
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
#include <sys/callout.h>
#endif
#include <netisdn/i4b_debug.h>
#include <netisdn/i4b_ioctl.h>
#include <netisdn/i4b_trace.h>
#include <dev/ic/isic_l1.h>
#include <dev/ic/isac.h>
#include <dev/ic/hscx.h>
#include <netisdn/i4b_l1l2.h>
#include <netisdn/i4b_mbuf.h>
#include <netisdn/i4b_global.h>
static void isic_bchannel_start(isdn_layer1token, int h_chan);
static void isic_bchannel_stat(isdn_layer1token, int h_chan, bchan_statistics_t *bsp);
static void isic_set_linktab(isdn_layer1token, int channel, drvr_link_t *dlt);
static isdn_link_t *isic_ret_linktab(isdn_layer1token, int channel);
/*---------------------------------------------------------------------------*
* initialize one B channels rx/tx data structures and init/deinit HSCX
*---------------------------------------------------------------------------*/
void
isic_bchannel_setup(isdn_layer1token t, int h_chan, int bprot, int activate)
{
struct l1_softc *sc = (struct l1_softc*)t;
l1_bchan_state_t *chan = &sc->sc_chan[h_chan];
int s = splnet();
if(activate == 0)
{
/* deactivation */
isic_hscx_init(sc, h_chan, activate);
}
NDBGL1(L1_BCHAN, "unit=%d, channel=%d, %s",
sc->sc_unit, h_chan, activate ? "activate" : "deactivate");
/* general part */
chan->unit = sc->sc_unit; /* unit number */
chan->channel = h_chan; /* B channel */
chan->bprot = bprot; /* B channel protocol */
chan->state = HSCX_IDLE; /* B channel state */
/* receiver part */
i4b_Bcleanifq(&chan->rx_queue); /* clean rx queue */
chan->rx_queue.ifq_maxlen = IFQ_MAXLEN;
chan->rxcount = 0; /* reset rx counter */
i4b_Bfreembuf(chan->in_mbuf); /* clean rx mbuf */
chan->in_mbuf = NULL; /* reset mbuf ptr */
chan->in_cbptr = NULL; /* reset mbuf curr ptr */
chan->in_len = 0; /* reset mbuf data len */
/* transmitter part */
i4b_Bcleanifq(&chan->tx_queue); /* clean tx queue */
chan->tx_queue.ifq_maxlen = IFQ_MAXLEN;
chan->txcount = 0; /* reset tx counter */
i4b_Bfreembuf(chan->out_mbuf_head); /* clean tx mbuf */
chan->out_mbuf_head = NULL; /* reset head mbuf ptr */
chan->out_mbuf_cur = NULL; /* reset current mbuf ptr */
chan->out_mbuf_cur_ptr = NULL; /* reset current mbuf data ptr */
chan->out_mbuf_cur_len = 0; /* reset current mbuf data cnt */
if(activate != 0)
{
/* activation */
isic_hscx_init(sc, h_chan, activate);
}
splx(s);
}
/*---------------------------------------------------------------------------*
* start transmission on a b channel
*---------------------------------------------------------------------------*/
static void
isic_bchannel_start(isdn_layer1token t, int h_chan)
{
struct l1_softc *sc = (struct l1_softc*)t;
register l1_bchan_state_t *chan = &sc->sc_chan[h_chan];
register int next_len;
register int len;
int s;
int activity = -1;
int cmd = 0;
s = splnet(); /* enter critical section */
if(chan->state & HSCX_TX_ACTIVE) /* already running ? */
{
splx(s);
return; /* yes, leave */
}
/* get next mbuf from queue */
IF_DEQUEUE(&chan->tx_queue, chan->out_mbuf_head);
if(chan->out_mbuf_head == NULL) /* queue empty ? */
{
splx(s); /* leave critical section */
return; /* yes, exit */
}
/* init current mbuf values */
chan->out_mbuf_cur = chan->out_mbuf_head;
chan->out_mbuf_cur_len = chan->out_mbuf_cur->m_len;
chan->out_mbuf_cur_ptr = chan->out_mbuf_cur->m_data;
/* activity indicator for timeout handling */
if(chan->bprot == BPROT_NONE)
{
if(!(isic_hscx_silence(chan->out_mbuf_cur->m_data,
chan->out_mbuf_cur->m_len)))
activity = ACT_TX;
}
else
{
activity = ACT_TX;
}
chan->state |= HSCX_TX_ACTIVE; /* we start transmitting */
if(sc->sc_trace & TRACE_B_TX) /* if trace, send mbuf to trace dev */
{
i4b_trace_hdr hdr;
hdr.type = (h_chan == HSCX_CH_A ? TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_TE;
hdr.count = ++sc->sc_trace_bcount;
isdn_layer2_trace_ind(sc->sc_l2, &hdr,
chan->out_mbuf_cur->m_len, chan->out_mbuf_cur->m_data);
}
len = 0; /* # of chars put into HSCX tx fifo this time */
/*
* fill the HSCX tx fifo with data from the current mbuf. if
* current mbuf holds less data than HSCX fifo length, try to
* get the next mbuf from (a possible) mbuf chain. if there is
* not enough data in a single mbuf or in a chain, then this
* is the last mbuf and we tell the HSCX that it has to send
* CRC and closing flag
*/
while((len < sc->sc_bfifolen) && chan->out_mbuf_cur)
{
/*
* put as much data into the HSCX fifo as is
* available from the current mbuf
*/
if((len + chan->out_mbuf_cur_len) >= sc->sc_bfifolen)
next_len = sc->sc_bfifolen - len;
else
next_len = chan->out_mbuf_cur_len;
#ifdef NOTDEF
printf("b:mh=%x, mc=%x, mcp=%x, mcl=%d l=%d nl=%d # ",
chan->out_mbuf_head,
chan->out_mbuf_cur,
chan->out_mbuf_cur_ptr,
chan->out_mbuf_cur_len,
len,
next_len);
#endif
/* wait for tx fifo write enabled */
isic_hscx_waitxfw(sc, h_chan);
/* write what we have from current mbuf to HSCX fifo */
HSCX_WRFIFO(h_chan, chan->out_mbuf_cur_ptr, next_len);
len += next_len; /* update # of bytes written */
chan->txcount += next_len; /* statistics */
chan->out_mbuf_cur_ptr += next_len; /* data ptr */
chan->out_mbuf_cur_len -= next_len; /* data len */
/*
* in case the current mbuf (of a possible chain) data
* has been put into the fifo, check if there is a next
* mbuf in the chain. If there is one, get ptr to it
* and update the data ptr and the length
*/
if((chan->out_mbuf_cur_len <= 0) &&
((chan->out_mbuf_cur = chan->out_mbuf_cur->m_next) != NULL))
{
chan->out_mbuf_cur_ptr = chan->out_mbuf_cur->m_data;
chan->out_mbuf_cur_len = chan->out_mbuf_cur->m_len;
if(sc->sc_trace & TRACE_B_TX)
{
i4b_trace_hdr hdr;
hdr.type = (h_chan == HSCX_CH_A ?
TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_TE;
hdr.count = ++sc->sc_trace_bcount;
isdn_layer2_trace_ind(sc->sc_l2, &hdr,
chan->out_mbuf_cur->m_len,
chan->out_mbuf_cur->m_data);
}
}
}
/*
* if there is either still data in the current mbuf and/or
* there is a successor on the chain available issue just
* a XTF (transmit) command to HSCX. if ther is no more
* data available from the current mbuf (-chain), issue
* an XTF and an XME (message end) command which will then
* send the CRC and the closing HDLC flag sequence
*/
if(chan->out_mbuf_cur && (chan->out_mbuf_cur_len > 0))
{
/*
* more data available, send current fifo out.
* next xfer to HSCX tx fifo is done in the
* HSCX interrupt routine.
*/
cmd |= HSCX_CMDR_XTF;
}
else
{
/* end of mbuf chain */
if(chan->bprot == BPROT_NONE)
cmd |= HSCX_CMDR_XTF;
else
cmd |= HSCX_CMDR_XTF | HSCX_CMDR_XME;
i4b_Bfreembuf(chan->out_mbuf_head); /* free mbuf chain */
chan->out_mbuf_head = NULL;
chan->out_mbuf_cur = NULL;
chan->out_mbuf_cur_ptr = NULL;
chan->out_mbuf_cur_len = 0;
}
/* call timeout handling routine */
if(activity == ACT_RX || activity == ACT_TX)
(*chan->drvr_linktab->bch_activity)(chan->drvr_linktab->unit,
activity);
if(cmd)
isic_hscx_cmd(sc, h_chan, cmd);
splx(s);
}
/*---------------------------------------------------------------------------*
* fill statistics struct
*---------------------------------------------------------------------------*/
static void
isic_bchannel_stat(isdn_layer1token t, int h_chan, bchan_statistics_t *bsp)
{
struct l1_softc *sc = (struct l1_softc*)t;
l1_bchan_state_t *chan = &sc->sc_chan[h_chan];
int s;
s = splnet();
bsp->outbytes = chan->txcount;
bsp->inbytes = chan->rxcount;
chan->txcount = 0;
chan->rxcount = 0;
splx(s);
}
/*---------------------------------------------------------------------------*
* return the address of isic drivers linktab
*---------------------------------------------------------------------------*/
static isdn_link_t *
isic_ret_linktab(isdn_layer1token t, int channel)
{
struct l1_softc *sc = (struct l1_softc*)t;
l1_bchan_state_t *chan = &sc->sc_chan[channel];
return(&chan->isdn_linktab);
}
/*---------------------------------------------------------------------------*
* set the driver linktab in the b channel softc
*---------------------------------------------------------------------------*/
static void
isic_set_linktab(isdn_layer1token t, int channel, drvr_link_t *dlt)
{
struct l1_softc *sc = (struct l1_softc*)t;
l1_bchan_state_t *chan = &sc->sc_chan[channel];
chan->drvr_linktab = dlt;
}
/*---------------------------------------------------------------------------*
* initialize our local linktab
*---------------------------------------------------------------------------*/
void
isic_init_linktab(struct l1_softc *sc)
{
l1_bchan_state_t *chan = &sc->sc_chan[HSCX_CH_A];
isdn_link_t *lt = &chan->isdn_linktab;
/* make sure the hardware driver is known to layer 4 */
ctrl_types[CTRL_PASSIVE].set_linktab = isic_set_linktab;
ctrl_types[CTRL_PASSIVE].get_linktab = isic_ret_linktab;
/* local setup */
lt->l1token = sc;
lt->channel = HSCX_CH_A;
lt->bch_config = isic_bchannel_setup;
lt->bch_tx_start = isic_bchannel_start;
lt->bch_stat = isic_bchannel_stat;
lt->tx_queue = &chan->tx_queue;
/* used by non-HDLC data transfers, i.e. telephony drivers */
lt->rx_queue = &chan->rx_queue;
/* used by HDLC data transfers, i.e. ipr and isp drivers */
lt->rx_mbuf = &chan->in_mbuf;
chan = &sc->sc_chan[HSCX_CH_B];
lt = &chan->isdn_linktab;
lt->l1token = sc;
lt->channel = HSCX_CH_B;
lt->bch_config = isic_bchannel_setup;
lt->bch_tx_start = isic_bchannel_start;
lt->bch_stat = isic_bchannel_stat;
lt->tx_queue = &chan->tx_queue;
/* used by non-HDLC data transfers, i.e. telephony drivers */
lt->rx_queue = &chan->rx_queue;
/* used by HDLC data transfers, i.e. ipr and isp drivers */
lt->rx_mbuf = &chan->in_mbuf;
}
/*---------------------------------------------------------------------------*
* telephony silence detection
*---------------------------------------------------------------------------*/
#define TEL_IDLE_MIN (BCH_MAX_DATALEN/2)
int
isic_hscx_silence(unsigned char *data, int len)
{
register int i = 0;
register int j = 0;
/* count idle bytes */
for(;i < len; i++)
{
if((*data >= 0xaa) && (*data <= 0xac))
j++;
data++;
}
#ifdef NOTDEF
printf("isic_hscx_silence: got %d silence bytes in frame\n", j);
#endif
if(j < (TEL_IDLE_MIN))
return(0);
else
return(1);
}
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