/* * 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 1.6 2002/03/17 20:54:04 martin Exp $ * * last edit-date: [Fri Jan 5 11:36:11 2001] * *---------------------------------------------------------------------------*/ #include __KERNEL_RCSID(0, "$NetBSD: isic_bchan.c,v 1.6 2002/03/17 20:54:04 martin Exp $"); #include #if defined(__FreeBSD__) && __FreeBSD__ >= 3 #include #else #include #endif #include #include #include #include #ifdef __FreeBSD__ #include #include #else #ifndef __bsdi__ #include #endif #include #endif #include #include #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000 #include #endif #include #include #include #include #include #include #include #include #include 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_link(isdn_layer1token, int channel, const struct isdn_l4_driver_functions *l4_driver, void *l4_driver_softc); 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->l4_driver->bch_activity)( chan->l4_driver_softc, 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_link(isdn_layer1token t, int channel, const struct isdn_l4_driver_functions *l4_driver, void *l4_driver_softc) { struct l1_softc *sc = (struct l1_softc*)t; l1_bchan_state_t *chan = &sc->sc_chan[channel]; chan->l4_driver = l4_driver; chan->l4_driver_softc = l4_driver_softc; } static const struct isdn_l4_bchannel_functions isic_l4_bchannel_functions = { isic_bchannel_setup, isic_bchannel_start, isic_bchannel_stat }; /*---------------------------------------------------------------------------* * 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_l4_driver = isic_set_link; ctrl_types[CTRL_PASSIVE].get_linktab = isic_ret_linktab; /* local setup */ lt->l1token = sc; lt->channel = HSCX_CH_A; lt->bchannel_driver = &isic_l4_bchannel_functions; 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->bchannel_driver = &isic_l4_bchannel_functions; 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); }