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freebsd-nq/sys/i4b/layer1/isic/i4b_hscx.c

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/*-
* Copyright (c) 1997, 2002 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 - Siemens HSCX chip (B-channel) handling
* --------------------------------------------
* last edit-date: [Sat Mar 9 16:01:49 2002]
*
*---------------------------------------------------------------------------*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <machine/i4b_debug.h>
#include <machine/i4b_ioctl.h>
#include <machine/i4b_trace.h>
#include <i4b/layer1/isic/i4b_isic.h>
#include <i4b/layer1/isic/i4b_hscx.h>
#include <i4b/layer1/i4b_l1.h>
#include <i4b/include/i4b_global.h>
#include <i4b/include/i4b_mbuf.h>
/*---------------------------------------------------------------------------*
* HSCX IRQ Handler
*---------------------------------------------------------------------------*/
void
isic_hscx_irq(register struct l1_softc *sc, u_char ista, int h_chan, u_char ex_irq)
{
register l1_bchan_state_t *chan = &sc->sc_chan[h_chan];
u_char exir = 0;
int activity = -1;
u_char cmd = 0;
NDBGL1(L1_H_IRQ, "%#x", ista);
if(ex_irq)
{
/* get channel extended irq reg */
exir = HSCX_READ(h_chan, H_EXIR);
if(exir & HSCX_EXIR_RFO)
{
chan->stat_RFO++;
NDBGL1(L1_H_XFRERR, "ex_irq: receive data overflow");
}
if((exir & HSCX_EXIR_XDU) && (chan->bprot != BPROT_NONE))/* xmit data underrun */
{
chan->stat_XDU++;
NDBGL1(L1_H_XFRERR, "ex_irq: xmit data underrun");
isic_hscx_cmd(sc, h_chan, HSCX_CMDR_XRES);
if (chan->out_mbuf_head != NULL) /* don't continue to transmit this buffer */
{
i4b_Bfreembuf(chan->out_mbuf_head);
chan->out_mbuf_cur = chan->out_mbuf_head = NULL;
}
}
}
/* rx message end, end of frame */
if(ista & HSCX_ISTA_RME)
{
register int fifo_data_len;
u_char rsta;
int error = 0;
rsta = HSCX_READ(h_chan, H_RSTA);
if((rsta & 0xf0) != 0xa0)
{
if((rsta & HSCX_RSTA_VFR) == 0)
{
chan->stat_VFR++;
cmd |= (HSCX_CMDR_RHR);
NDBGL1(L1_H_XFRERR, "received invalid Frame");
error++;
}
if(rsta & HSCX_RSTA_RDO)
{
chan->stat_RDO++;
NDBGL1(L1_H_XFRERR, "receive data overflow");
error++;
}
if((rsta & HSCX_RSTA_CRC) == 0)
{
chan->stat_CRC++;
cmd |= (HSCX_CMDR_RHR);
NDBGL1(L1_H_XFRERR, "CRC check failed");
error++;
}
if(rsta & HSCX_RSTA_RAB)
{
chan->stat_RAB++;
NDBGL1(L1_H_XFRERR, "Receive message aborted");
error++;
}
}
fifo_data_len = ((HSCX_READ(h_chan, H_RBCL)) &
((sc->sc_bfifolen)-1));
if(fifo_data_len == 0)
fifo_data_len = sc->sc_bfifolen;
/* all error conditions checked, now decide and take action */
if(error == 0)
{
if(chan->in_mbuf == NULL)
{
if((chan->in_mbuf = i4b_Bgetmbuf(BCH_MAX_DATALEN)) == NULL)
panic("L1 isic_hscx_irq: RME, cannot allocate mbuf!\n");
chan->in_cbptr = chan->in_mbuf->m_data;
chan->in_len = 0;
}
fifo_data_len -= 1; /* last byte in fifo is RSTA ! */
if((chan->in_len + fifo_data_len) <= BCH_MAX_DATALEN)
{
/* read data from HSCX fifo */
HSCX_RDFIFO(h_chan, chan->in_cbptr, fifo_data_len);
cmd |= (HSCX_CMDR_RMC);
isic_hscx_cmd(sc, h_chan, cmd);
cmd = 0;
chan->in_len += fifo_data_len;
chan->rxcount += fifo_data_len;
/* setup mbuf data length */
chan->in_mbuf->m_len = chan->in_len;
chan->in_mbuf->m_pkthdr.len = chan->in_len;
if(sc->sc_trace & TRACE_B_RX)
{
i4b_trace_hdr_t hdr;
hdr.unit = L0ISICUNIT(sc->sc_unit);
hdr.type = (h_chan == HSCX_CH_A ? TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_NT;
hdr.count = ++sc->sc_trace_bcount;
MICROTIME(hdr.time);
i4b_l1_trace_ind(&hdr, chan->in_mbuf->m_len, chan->in_mbuf->m_data);
}
(*chan->isic_drvr_linktab->bch_rx_data_ready)(chan->isic_drvr_linktab->unit);
activity = ACT_RX;
/* mark buffer ptr as unused */
chan->in_mbuf = NULL;
chan->in_cbptr = NULL;
chan->in_len = 0;
}
else
{
NDBGL1(L1_H_XFRERR, "RAWHDLC rx buffer overflow in RME, in_len=%d, fifolen=%d", chan->in_len, fifo_data_len);
chan->in_cbptr = chan->in_mbuf->m_data;
chan->in_len = 0;
cmd |= (HSCX_CMDR_RHR | HSCX_CMDR_RMC);
}
}
else
{
if (chan->in_mbuf != NULL)
{
i4b_Bfreembuf(chan->in_mbuf);
chan->in_mbuf = NULL;
chan->in_cbptr = NULL;
chan->in_len = 0;
}
cmd |= (HSCX_CMDR_RMC);
}
}
/* rx fifo full */
if(ista & HSCX_ISTA_RPF)
{
if(chan->in_mbuf == NULL)
{
if((chan->in_mbuf = i4b_Bgetmbuf(BCH_MAX_DATALEN)) == NULL)
panic("L1 isic_hscx_irq: RPF, cannot allocate mbuf!\n");
chan->in_cbptr = chan->in_mbuf->m_data;
chan->in_len = 0;
}
chan->rxcount += sc->sc_bfifolen;
if((chan->in_len + sc->sc_bfifolen) <= BCH_MAX_DATALEN)
{
/* read data from HSCX fifo */
HSCX_RDFIFO(h_chan, chan->in_cbptr, sc->sc_bfifolen);
chan->in_cbptr += sc->sc_bfifolen;
chan->in_len += sc->sc_bfifolen;
}
else
{
if(chan->bprot == BPROT_NONE)
{
/* setup mbuf data length */
chan->in_mbuf->m_len = chan->in_len;
chan->in_mbuf->m_pkthdr.len = chan->in_len;
if(sc->sc_trace & TRACE_B_RX)
{
i4b_trace_hdr_t hdr;
hdr.unit = L0ISICUNIT(sc->sc_unit);
hdr.type = (h_chan == HSCX_CH_A ? TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_NT;
hdr.count = ++sc->sc_trace_bcount;
MICROTIME(hdr.time);
i4b_l1_trace_ind(&hdr, chan->in_mbuf->m_len, chan->in_mbuf->m_data);
}
/* silence detection */
if(!(i4b_l1_bchan_tel_silence(chan->in_mbuf->m_data, chan->in_mbuf->m_len)))
activity = ACT_RX;
(void) IF_HANDOFF(&chan->rx_queue, chan->in_mbuf, NULL);
/* signal upper driver that data is available */
(*chan->isic_drvr_linktab->bch_rx_data_ready)(chan->isic_drvr_linktab->unit);
/* alloc new buffer */
if((chan->in_mbuf = i4b_Bgetmbuf(BCH_MAX_DATALEN)) == NULL)
panic("L1 isic_hscx_irq: RPF, cannot allocate new mbuf!\n");
/* setup new data ptr */
chan->in_cbptr = chan->in_mbuf->m_data;
/* read data from HSCX fifo */
HSCX_RDFIFO(h_chan, chan->in_cbptr, sc->sc_bfifolen);
chan->in_cbptr += sc->sc_bfifolen;
chan->in_len = sc->sc_bfifolen;
chan->rxcount += sc->sc_bfifolen;
}
else
{
NDBGL1(L1_H_XFRERR, "RAWHDLC rx buffer overflow in RPF, in_len=%d", chan->in_len);
chan->in_cbptr = chan->in_mbuf->m_data;
chan->in_len = 0;
cmd |= (HSCX_CMDR_RHR);
}
}
/* command to release fifo space */
cmd |= HSCX_CMDR_RMC;
}
/* transmit fifo empty, new data can be written to fifo */
if(ista & HSCX_ISTA_XPR)
{
/*
* for a description what is going on here, please have
* a look at isic_bchannel_start() in i4b_bchan.c !
*/
int activity = -1;
int len;
int nextlen;
NDBGL1(L1_H_IRQ, "unit %d, chan %d - XPR, Tx Fifo Empty!", sc->sc_unit, h_chan);
if(chan->out_mbuf_cur == NULL) /* last frame is transmitted */
{
IF_DEQUEUE(&chan->tx_queue, chan->out_mbuf_head);
if(chan->out_mbuf_head == NULL)
{
chan->state &= ~HSCX_TX_ACTIVE;
(*chan->isic_drvr_linktab->bch_tx_queue_empty)(chan->isic_drvr_linktab->unit);
}
else
{
chan->state |= HSCX_TX_ACTIVE;
chan->out_mbuf_cur = chan->out_mbuf_head;
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_t hdr;
hdr.unit = L0ISICUNIT(sc->sc_unit);
hdr.type = (h_chan == HSCX_CH_A ? TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_TE;
hdr.count = ++sc->sc_trace_bcount;
MICROTIME(hdr.time);
i4b_l1_trace_ind(&hdr, chan->out_mbuf_cur->m_len, chan->out_mbuf_cur->m_data);
}
if(chan->bprot == BPROT_NONE)
{
if(!(i4b_l1_bchan_tel_silence(chan->out_mbuf_cur->m_data, chan->out_mbuf_cur->m_len)))
activity = ACT_TX;
}
else
{
activity = ACT_TX;
}
}
}
len = 0;
while(chan->out_mbuf_cur && len != sc->sc_bfifolen)
{
nextlen = min(chan->out_mbuf_cur_len, sc->sc_bfifolen - len);
#ifdef NOTDEF
printf("i: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
isic_hscx_waitxfw(sc, h_chan); /* necessary !!! */
HSCX_WRFIFO(h_chan, chan->out_mbuf_cur_ptr, nextlen);
cmd |= HSCX_CMDR_XTF;
len += nextlen;
chan->txcount += nextlen;
chan->out_mbuf_cur_ptr += nextlen;
chan->out_mbuf_cur_len -= nextlen;
if(chan->out_mbuf_cur_len == 0)
{
if((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_t hdr;
hdr.unit = L0ISICUNIT(sc->sc_unit);
hdr.type = (h_chan == HSCX_CH_A ? TRC_CH_B1 : TRC_CH_B2);
hdr.dir = FROM_TE;
hdr.count = ++sc->sc_trace_bcount;
MICROTIME(hdr.time);
i4b_l1_trace_ind(&hdr, chan->out_mbuf_cur->m_len, chan->out_mbuf_cur->m_data);
}
}
else
{
if (chan->bprot != BPROT_NONE)
cmd |= HSCX_CMDR_XME;
i4b_Bfreembuf(chan->out_mbuf_head);
chan->out_mbuf_head = NULL;
}
}
}
}
if(cmd) /* is there a command for the HSCX ? */
{
isic_hscx_cmd(sc, h_chan, cmd); /* yes, to HSCX */
}
/* call timeout handling routine */
if(activity == ACT_RX || activity == ACT_TX)
(*chan->isic_drvr_linktab->bch_activity)(chan->isic_drvr_linktab->unit, activity);
}
/*---------------------------------------------------------------------------*
* HSCX initialization
*
* for telephony: extended transparent mode 1
* for raw hdlc: transparent mode 0
*---------------------------------------------------------------------------*/
void
isic_hscx_init(struct l1_softc *sc, int h_chan, int activate)
{
l1_bchan_state_t *chan = &sc->sc_chan[h_chan];
HSCX_WRITE(h_chan, H_MASK, 0xff); /* mask irq's */
if(sc->sc_ipac)
{
/* CCR1: Power Up, Clock Mode 5 */
HSCX_WRITE(h_chan, H_CCR1, HSCX_CCR1_PU | /* power up */
HSCX_CCR1_CM1); /* IPAC clock mode 5 */
}
else
{
/* CCR1: Power Up, Clock Mode 5 */
HSCX_WRITE(h_chan, H_CCR1, HSCX_CCR1_PU | /* power up */
HSCX_CCR1_CM2 | /* HSCX clock mode 5 */
HSCX_CCR1_CM0);
}
/* XAD1: Transmit Address Byte 1 */
HSCX_WRITE(h_chan, H_XAD1, 0xff);
/* XAD2: Transmit Address Byte 2 */
HSCX_WRITE(h_chan, H_XAD2, 0xff);
/* RAH2: Receive Address Byte High Reg. 2 */
HSCX_WRITE(h_chan, H_RAH2, 0xff);
/* XBCH: reset Transmit Byte Count High */
HSCX_WRITE(h_chan, H_XBCH, 0x00);
/* RLCR: reset Receive Length Check Register */
HSCX_WRITE(h_chan, H_RLCR, 0x00);
/* CCR2: set tx/rx clock shift bit 0 */
/* disable CTS irq, disable RIE irq*/
HSCX_WRITE(h_chan, H_CCR2, HSCX_CCR2_XCS0|HSCX_CCR2_RCS0);
/* XCCR: tx bit count per time slot */
HSCX_WRITE(h_chan, H_XCCR, 0x07);
/* RCCR: rx bit count per time slot */
HSCX_WRITE(h_chan, H_RCCR, 0x07);
if(sc->sc_bustyp == BUS_TYPE_IOM2)
{
switch(h_chan)
{
case HSCX_CH_A: /* Prepare HSCX channel A */
/* TSAX: tx clock shift bits 1 & 2 */
/* tx time slot number */
HSCX_WRITE(h_chan, H_TSAX, 0x2f);
/* TSAR: rx clock shift bits 1 & 2 */
/* rx time slot number */
HSCX_WRITE(h_chan, H_TSAR, 0x2f);
break;
case HSCX_CH_B: /* Prepare HSCX channel B */
/* TSAX: tx clock shift bits 1 & 2 */
/* tx time slot number */
HSCX_WRITE(h_chan, H_TSAX, 0x03);
/* TSAR: rx clock shift bits 1 & 2 */
/* rx time slot number */
HSCX_WRITE(h_chan, H_TSAR, 0x03);
break;
}
}
else /* IOM 1 setup */
{
/* TSAX: tx clock shift bits 1 & 2 */
/* tx time slot number */
HSCX_WRITE(h_chan, H_TSAX, 0x07);
/* TSAR: rx clock shift bits 1 & 2 */
/* rx time slot number */
HSCX_WRITE(h_chan, H_TSAR, 0x07);
}
if(activate)
{
if(chan->bprot == BPROT_RHDLC)
{
/* HDLC Frames, transparent mode 0 */
HSCX_WRITE(h_chan, H_MODE,
HSCX_MODE_MDS1|HSCX_MODE_RAC|HSCX_MODE_RTS);
}
else
{
/* Raw Telephony, extended transparent mode 1 */
HSCX_WRITE(h_chan, H_MODE,
HSCX_MODE_MDS1|HSCX_MODE_MDS0|HSCX_MODE_ADM|HSCX_MODE_RTS);
}
#if 0
isic_hscx_cmd(sc, h_chan, HSCX_CMDR_RHR|HSCX_CMDR_XRES);
#else
isic_hscx_cmd(sc, h_chan, HSCX_CMDR_RHR);
#endif
}
else
{
/* TSAX: tx time slot */
HSCX_WRITE(h_chan, H_TSAX, 0xff);
/* TSAR: rx time slot */
HSCX_WRITE(h_chan, H_TSAR, 0xff);
/* Raw Telephony, extended transparent mode 1 */
HSCX_WRITE(h_chan, H_MODE,
HSCX_MODE_MDS1|HSCX_MODE_MDS0|HSCX_MODE_ADM|HSCX_MODE_RTS);
}
/* don't touch ICA, EXA and EXB bits, this could be HSCX_CH_B */
/* always disable RSC and TIN */
chan->hscx_mask |= HSCX_MASK_RSC | HSCX_MASK_TIN;
if(activate)
{
/* enable */
chan->hscx_mask &= ~(HSCX_MASK_RME | HSCX_MASK_RPF | HSCX_MASK_XPR);
}
else
{
/* disable */
chan->hscx_mask |= HSCX_MASK_RME | HSCX_MASK_RPF | HSCX_MASK_XPR;
}
/* handle ICA, EXA, and EXB via interrupt mask of channel b */
if (h_chan == HSCX_CH_A)
{
if (activate)
HSCX_B_IMASK &= ~(HSCX_MASK_EXA | HSCX_MASK_ICA);
else
HSCX_B_IMASK |= HSCX_MASK_EXA | HSCX_MASK_ICA;
HSCX_WRITE(HSCX_CH_A, H_MASK, HSCX_A_IMASK);
HSCX_WRITE(HSCX_CH_B, H_MASK, HSCX_B_IMASK);
}
else
{
if (activate)
HSCX_B_IMASK &= ~HSCX_MASK_EXB;
else
HSCX_B_IMASK |= HSCX_MASK_EXB;
HSCX_WRITE(HSCX_CH_B, H_MASK, HSCX_B_IMASK);
}
/* clear spurious interrupts left over */
if(h_chan == HSCX_CH_A)
{
HSCX_READ(h_chan, H_EXIR);
HSCX_READ(h_chan, H_ISTA);
}
else /* mask ICA, because it must not be cleared by reading ISTA */
{
HSCX_WRITE(HSCX_CH_B, H_MASK, HSCX_B_IMASK | HSCX_MASK_ICA);
HSCX_READ(h_chan, H_EXIR);
HSCX_READ(h_chan, H_ISTA);
HSCX_WRITE(HSCX_CH_B, H_MASK, HSCX_B_IMASK);
}
}
/*---------------------------------------------------------------------------*
* write command to HSCX command register
*---------------------------------------------------------------------------*/
void
isic_hscx_cmd(struct l1_softc *sc, int h_chan, unsigned char cmd)
{
int timeout = 20;
while(((HSCX_READ(h_chan, H_STAR)) & HSCX_STAR_CEC) && timeout)
{
DELAY(10);
timeout--;
}
if(timeout == 0)
{
NDBGL1(L1_H_ERR, "HSCX wait for CEC timeout!");
}
HSCX_WRITE(h_chan, H_CMDR, cmd);
}
/*---------------------------------------------------------------------------*
* wait for HSCX transmit FIFO write enable
*---------------------------------------------------------------------------*/
void
isic_hscx_waitxfw(struct l1_softc *sc, int h_chan)
{
#define WAITVAL 50
#define WAITTO 200
int timeout = WAITTO;
while((!(((HSCX_READ(h_chan, H_STAR)) &
(HSCX_STAR_CEC | HSCX_STAR_XFW)) == HSCX_STAR_XFW)) && timeout)
{
DELAY(WAITVAL);
timeout--;
}
if(timeout == 0)
{
NDBGL1(L1_H_ERR, "HSCX wait for XFW timeout!");
}
else if (timeout != WAITTO)
{
NDBGL1(L1_H_XFRERR, "HSCX wait for XFW time: %d uS", (WAITTO-timeout)*50);
}
}
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