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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [pppd/] [modem_example/] [modem.c] - Blame information for rev 773

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/*
 *  Modem device driver for RTEMS
 *  Author: Tomasz Domin (dot@comarch.pl)
 *  Copyright (C) 1998 by ComArch SA
 *  Driver will use termios for character output and ppp specific out procecedures for network protocols
 */
 
#include <bsp.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <sys/ttycom.h>
#include <unistd.h>
#include <sys/errno.h>
#include <rtems/rtems/event.h>
#include <rtems/rtems/tasks.h>
#include <mpc823.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/file.h>
 
#include <sys/kernel.h>
#include <sys/conf.h>
#include <net/if.h>
#include <net/ppp_defs.h>
#include <sys/fcntl.h>
#include "ppp.h"
#include <net/if_pppvar.h>
#include <net/if_ppp.h>
/* RTEMS specific */
rtems_id modem_task_id;
#include "16550.h"
#include <mpc823.h>
#define ESCAPE_P(c)     (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))
#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
 
#define M_DATASTART(m)  \
        (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
            (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
 
#define M_DATASIZE(m)   \
        (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
            (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
 
 
struct rtems_termios_tty *modem_tty;
/*
 * RTEMS event used by interrupt handler to signal daemons.
 * This must *not* be the same event used by the KA9Q task synchronization.
 */
#define INTERRUPT_EVENT       RTEMS_EVENT_1
#define START_TRANSMIT_EVENT    RTEMS_EVENT_2
#define PPP_LOWAT       100     /* Process more output when < LOWAT on queue */
#define PPP_HIWAT       400     /* Don't start a new packet if HIWAT on que */
 
/*
 * RTEMS event used to start transmit daemon.
 * This must not be the same as INTERRUPT_EVENT.
 */
 
/*static struct modem_tty *tp=&modem_tp;*/
static rtems_id modem_rx_task,modem_tx_task;
 
 
 
/* internal FIFO buffers for input and output characters */
#define MODEM_BUFFER_LENGTH 4096
#define RTS_STOP_SIZE MODEM_BUFFER_LENGTH-128
#define RTS_START_SIZE 16
 
int xmt_start,xmt_len;
int rcv_start,rcv_len;
 
static unsigned char xmt_buf[MODEM_BUFFER_LENGTH];
static unsigned char rcv_buf[MODEM_BUFFER_LENGTH];
 
static volatile char _tx_stop = 0 ,_modem_cd=0;
struct ModemData
{
        int t_line;
        struct ppp_softc *t_sc;
        rtems_id pppsem;
        int offhook;
} ModemData;
 
int pppstart(struct tty *ignore);
static u_short fcstab[256] = {
        0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
        0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
        0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
        0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
        0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
        0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
        0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
        0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
        0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
        0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
        0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
        0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
        0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
        0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
        0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
        0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
        0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
        0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
        0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
        0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
        0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
        0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
        0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
        0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
        0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
        0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
        0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
        0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
        0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
        0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
        0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
        0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
 
 
static u_short
pppfcs(fcs, cp, len)
    register u_short fcs;
    register u_char *cp;
    register int len;
{
    while (len--)
        fcs = PPP_FCS(fcs, *cp++);
    return (fcs);
}
 
static void
ppp_timeout(x)
    void *x;
{
    struct ppp_softc *sc = ModemData.t_sc;
    struct tty *tp = (struct tty *) sc->sc_devp;
    int s;
 
    sc->sc_flags &= ~SC_TIMEOUT;
    pppstart(tp);
}
 
static void
pppasyncrelinq(sc)
    struct ppp_softc *sc;
{
    int s;
 
    if (sc->sc_outm) {
        m_freem(sc->sc_outm);
        sc->sc_outm = NULL;
    }
    if (sc->sc_m) {
        m_freem(sc->sc_m);
        sc->sc_m = NULL;
    }
    if (sc->sc_flags & SC_TIMEOUT) {
        untimeout(ppp_timeout, (void *) sc);
        sc->sc_flags &= ~SC_TIMEOUT;
    }
}
 
/* Put data in input queue */
int
pppstart(struct tty *ignore)
{
    register struct ppp_softc *sc = ModemData.t_sc;
 
    /*
     * If there is stuff in the output queue, send it now.
     * We are being called in lieu of ttstart and must do what it would.
     */
        rtems_event_send(modem_tx_task,START_TRANSMIT_EVENT);
        sc->sc_if.if_flags  |= IFF_OACTIVE;
 
    /*
     * If the transmit queue has drained and the tty has not hung up
     * or been disconnected from the ppp unit, then tell if_ppp.c that
     * we need more output.
     */
/*    if (CCOUNT(&tp->t_outq) < PPP_LOWAT
        && !((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
        && sc != NULL && tp == (struct tty *) sc->sc_devp) {
        ppp_restart(sc);
    }
*/
    return 0;
}
int putc(unsigned char c)
{
        int level;
 
        if (xmt_len<MODEM_BUFFER_LENGTH-1)
        {
                _CPU_ISR_Disable(level);
                xmt_buf[(xmt_start+xmt_len)%MODEM_BUFFER_LENGTH]=c;
                xmt_len++;
                _CPU_ISR_Enable(level);
                return 0;
        }
        return 1;
}
 
void  unputc(void)
{
        int level;
 
        if (xmt_len==0)
                return;
        _CPU_ISR_Disable(level);
                xmt_len--;
        _CPU_ISR_Enable(level);
}
 
static void
pppasyncstart(sc)
    register struct ppp_softc *sc;
{
    /* Call pppstart to start output again if necessary. */
    pppstart(sc->sc_devp);
 
    /*
     * This timeout is needed for operation on a pseudo-tty,
     * because the pty code doesn't call pppstart after it has
     * drained the t_outq.
     */
/*    if (!idle && (sc->sc_flags & SC_TIMEOUT) == 0) {
        timeout(ppp_timeout, (void *) sc, 1);
        sc->sc_flags |= SC_TIMEOUT;
    }
*/
 
}
 
 
void modem_sendpacket()
{
  struct mbuf *l = NULL;
  rtems_unsigned16 status;
  int curr;
  register struct mbuf *m;
  register int len;
  register u_char *start, *stop, *cp;
  int n, ndone, done, idle;
  struct mbuf *m2;
  int s;
   register struct ppp_softc *sc=ModemData.t_sc;
 
 
   while (xmt_len < PPP_HIWAT) {
        /*
         * See if we have an existing packet partly sent.
         * If not, get a new packet and start sending it.
         */
        m = sc->sc_outm;
        if (m == NULL) {
            /*
             * Get another packet to be sent.
 
             */
            m = ppp_dequeue(sc);
            if (m == NULL)
            {
                        break;
                 }
 
            /*
             * The extra PPP_FLAG will start up a new packet, and thus
             * will flush any accumulated garbage.  We do this whenever
             * the line may have been idle for some time.
             */
            if (xmt_len == 0) {
                ++sc->sc_stats.ppp_obytes;
                         putc(PPP_FLAG);
            }
 
            /* Calculate the FCS for the first mbuf's worth. */
            sc->sc_outfcs = pppfcs(PPP_INITFCS, mtod(m, u_char *), m->m_len);
            microtime(&sc->sc_if.if_lastchange);
        }
 
        for (;;) {
            start = mtod(m, u_char *);
            len = m->m_len;
            stop = start + len;
            while (len > 0) {
                /*
                 * Find out how many bytes in the string we can
                 * handle without doing something special.
                 */
                for (cp = start; cp < stop; cp++)
                    if (ESCAPE_P(*cp))
                                break;
                n = cp - start;
                if (n) {
                        register int i;
                    /* NetBSD (0.9 or later), 4.3-Reno or similar. */
                         for(i=0;i<n;i++)
                                if (putc(start[i]))
                                        break;
                    ndone = i;
                    len -= ndone;
                    start += ndone;
                    sc->sc_stats.ppp_obytes += ndone;
 
                    if (ndone < n)
                        break;  /* packet doesn't fit */
                }
                /*
                 * If there are characters left in the mbuf,
                 * the first one must be special.
                 * Put it out in a different form.
                 */
                if (len) {
                    if (putc(PPP_ESCAPE))
                        break;
                    if (putc(*start ^ PPP_TRANS)) {
                         unputc();
                        break;
                    }
                    sc->sc_stats.ppp_obytes += 2;
                    start++;
                    len--;
                }
            }
 
            /*
             * If we didn't empty this mbuf, remember where we're up to.
             * If we emptied the last mbuf, try to add the FCS and closing
             * flag, and if we can't, leave sc_outm pointing to m, but with
             * m->m_len == 0, to remind us to output the FCS and flag later.
             */
            done = len == 0;
            if (done && m->m_next == NULL) {
                u_char *p, *q;
                int c;
                u_char endseq[8];
 
                /*
                 * We may have to escape the bytes in the FCS.
                 */
                p = endseq;
                c = ~sc->sc_outfcs & 0xFF;
                if (ESCAPE_P(c)) {
                    *p++ = PPP_ESCAPE;
                    *p++ = c ^ PPP_TRANS;
                } else
                    *p++ = c;
                c = (~sc->sc_outfcs >> 8) & 0xFF;
                if (ESCAPE_P(c)) {
                    *p++ = PPP_ESCAPE;
                    *p++ = c ^ PPP_TRANS;
                } else
                    *p++ = c;
                *p++ = PPP_FLAG;
 
                /*
                 * Try to output the FCS and flag.  If the bytes
                 * don't all fit, back out.
                 */
                for (q = endseq; q < p; ++q)
                    if (putc(*q)) {
                        done = 0;
                        for (; q > endseq; --q)
                            unputc();
                        break;
                    }
                if (done)
                    sc->sc_stats.ppp_obytes += q - endseq;
            }
 
            if (!done) {
                /* remember where we got to */
                m->m_data = start;
                m->m_len = len;
                break;
            }
 
            /* Finished with this mbuf; free it and move on. */
            MFREE(m, m2);
            m = m2;
            if (m == NULL) {
                /* Finished a packet */
                break;
            }
            sc->sc_outfcs = pppfcs(sc->sc_outfcs, mtod(m, u_char *), m->m_len);
        }
 
        /*
         * If m == NULL, we have finished a packet.
         * If m != NULL, we've either done as much work this time
         * as we need to, or else we've filled up the output queue.
         */
        sc->sc_outm = m;
        if (m)
            break;
    }
 
}
 
static void
pppasyncctlp(sc)
    struct ppp_softc *sc;
{
        rtems_semaphore_release(ModemData.pppsem);
}
 
 
static unsigned paritytab[8] = {
    0x96696996, 0x69969669, 0x69969669, 0x96696996,
    0x69969669, 0x96696996, 0x96696996, 0x69969669
};
#define MAX_DUMP_BYTES  128
 
static void
pppdumpb(b, l)
    u_char *b;
    int l;
{
    char buf[3*MAX_DUMP_BYTES+4];
    char *bp = buf;
    static char digits[] = "0123456789abcdef";
 
    while (l--) {
        if (bp >= buf + sizeof(buf) - 3) {
            *bp++ = '>';
            break;
        }
        *bp++ = digits[*b >> 4]; /* convert byte to ascii hex */
        *bp++ = digits[*b++ & 0xf];
        *bp++ = ' ';
    }
 
    *bp = 0;
 
}
 
static void
ppplogchar(sc, c)
    struct ppp_softc *sc;
    int c;
{
    if (c >= 0)
        sc->sc_rawin[sc->sc_rawin_count++] = c;
    if (sc->sc_rawin_count >= sizeof(sc->sc_rawin)
        || (c < 0 && sc->sc_rawin_count > 0)) {
/*      printf("ppp%d input: ", sc->sc_if.if_unit);
*/      pppdumpb(sc->sc_rawin, sc->sc_rawin_count);
        sc->sc_rawin_count = 0;
    }
}
static void
pppgetm(sc)
    register struct ppp_softc *sc;
{
    struct mbuf *m, **mp;
    int len;
    mp = &sc->sc_m;
    for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
        if ((m = *mp) == NULL) {
            MGETHDR(m, M_DONTWAIT, MT_DATA);
            if (m == NULL)
                break;
            *mp = m;
            MCLGET(m, M_DONTWAIT);
        }
        len -= M_DATASIZE(m);
        mp = &m->m_next;
    }
}
 
 
int
pppinput(c)
    int c;
 
{
    register struct ppp_softc *sc=ModemData.t_sc;
    struct mbuf *m;
    int ilen, s;
 
    if (sc == NULL )
        return 0;
 
    ++sc->sc_stats.ppp_ibytes;
/*
    if (c & TTY_FE) {*/
        /* framing error or overrun on this char - abort packet */
/*      if (sc->sc_flags & SC_DEBUG)
            printf("ppp%d: bad char %x\n", sc->sc_if.if_unit, c);
        goto flush;
    }*/
 
    c &= 0xff;
 
    /*
     * Handle software flow control of output.
     */
/*    if (tp->t_iflag & IXON) {
        if (c == tp->t_cc[VSTOP] ) {
            if ((tp->t_state & TS_TTSTOP) == 0) {
                tp->t_state |= TS_TTSTOP;
                sccppp_stop_transmission(tp);
            }
            return 0;
        }
        if (c == tp->t_cc[VSTART]  ) {
            tp->t_state &= ~TS_TTSTOP;
                sccppp_start_transmission(tp);
            return 0;
        }
    }
*/
 
    if (c & 0x80)
        sc->sc_flags |= SC_RCV_B7_1;
    else
        sc->sc_flags |= SC_RCV_B7_0;
    if (paritytab[c >> 5] & (1 << (c & 0x1F)))
        sc->sc_flags |= SC_RCV_ODDP;
    else
        sc->sc_flags |= SC_RCV_EVNP;
 
 
/*    if (sc->sc_flags & SC_LOG_RAWIN)*/
//      ppplogchar(sc, c);
 
    if (c == PPP_FLAG) {
        ilen = sc->sc_ilen;
        sc->sc_ilen = 0;
 
        if (sc->sc_rawin_count > 0)
            ppplogchar(sc, -1);
 
        /*
         * If SC_ESCAPED is set, then we've seen the packet
         * abort sequence
         */
        if (sc->sc_flags & (SC_FLUSH | SC_ESCAPED)
            || (ilen > 0 && sc->sc_fcs != PPP_GOODFCS)) {
            sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
            if ((sc->sc_flags & (SC_FLUSH | SC_ESCAPED)) == 0){
                if (sc->sc_flags & SC_DEBUG)
                    printf("ppp%d: bad fcs %x, pkt len %d\n",
                           sc->sc_if.if_unit, sc->sc_fcs, ilen);
                sc->sc_if.if_ierrors++;
                sc->sc_stats.ppp_ierrors++;
            } else
                sc->sc_flags &= ~(SC_FLUSH | SC_ESCAPED);
            return 0;
        }
 
        if (ilen < PPP_HDRLEN + PPP_FCSLEN) {
            if (ilen) {
                if (sc->sc_flags & SC_DEBUG)
/*                  printf("ppp%d: too short (%d)\n", sc->sc_if.if_unit, ilen);
*/              sc->sc_if.if_ierrors++;
                sc->sc_stats.ppp_ierrors++;
                sc->sc_flags |= SC_PKTLOST;
                splx(s);
            }
            return 0;
        }
 
        /*
         * Remove FCS trailer.  Somewhat painful...
         */
        ilen -= 2;
        if (--sc->sc_mc->m_len == 0) {
            for (m = sc->sc_m; m->m_next != sc->sc_mc; m = m->m_next)
                ;
            sc->sc_mc = m;
        }
        sc->sc_mc->m_len--;
 
        /* excise this mbuf chain */
        m = sc->sc_m;
        sc->sc_m = sc->sc_mc->m_next;
        sc->sc_mc->m_next = NULL;
        ppppktin(sc, m, sc->sc_flags & SC_PKTLOST);
        if (sc->sc_flags & SC_PKTLOST) {
            sc->sc_flags &= ~SC_PKTLOST;
        }
 
        pppgetm(sc);
        return 0;
    }
 
    if (sc->sc_flags & SC_FLUSH) {
        if (sc->sc_flags & SC_LOG_FLUSH)
            ppplogchar(sc, c);
        return 0;
    }
 
    if (c < 0x20 && (sc->sc_rasyncmap & (1 << c)))
        return 0;
 
    if (sc->sc_flags & SC_ESCAPED) {
        sc->sc_flags &= ~SC_ESCAPED;
        c ^= PPP_TRANS;
    } else if (c == PPP_ESCAPE) {
        sc->sc_flags |= SC_ESCAPED;
        return 0;
    }
 
    /*
     * Initialize buffer on first octet received.
     * First octet could be address or protocol (when compressing
     * address/control).
     * Second octet is control.
     * Third octet is first or second (when compressing protocol)
     * octet of protocol.
     * Fourth octet is second octet of protocol.
     */
    if (sc->sc_ilen == 0) {
        /* reset the first input mbuf */
        if (sc->sc_m == NULL) {
            pppgetm(sc);
            if (sc->sc_m == NULL) {
                if (sc->sc_flags & SC_DEBUG)
/*                  printf("ppp%d: no input mbufs!\n", sc->sc_if.if_unit);
*/              goto flush;
            }
        }
        m = sc->sc_m;
        m->m_len = 0;
        m->m_data = M_DATASTART(sc->sc_m);
        sc->sc_mc = m;
        sc->sc_mp = mtod(m, char *);
        sc->sc_fcs = PPP_INITFCS;
        if (c != PPP_ALLSTATIONS) {
            if (sc->sc_flags & SC_REJ_COMP_AC) {
                if (sc->sc_flags & SC_DEBUG)
/*                  printf("ppp%d: garbage received: 0x%x (need 0xFF)\n",
                           sc->sc_if.if_unit, c);*/
                goto flush;
            }
            *sc->sc_mp++ = PPP_ALLSTATIONS;
            *sc->sc_mp++ = PPP_UI;
            sc->sc_ilen += 2;
            m->m_len += 2;
        }
    }
    if (sc->sc_ilen == 1 && c != PPP_UI) {
        if (sc->sc_flags & SC_DEBUG)
/*          printf("ppp%d: missing UI (0x3), got 0x%x\n",
                   sc->sc_if.if_unit, c);
*/      goto flush;
    }
    if (sc->sc_ilen == 2 && (c & 1) == 1) {
        /* a compressed protocol */
        *sc->sc_mp++ = 0;
        sc->sc_ilen++;
        sc->sc_mc->m_len++;
    }
    if (sc->sc_ilen == 3 && (c & 1) == 0) {
        if (sc->sc_flags & SC_DEBUG)
/*          printf("ppp%d: bad protocol %x\n", sc->sc_if.if_unit,
                   (sc->sc_mp[-1] << 8) + c);
*/      goto flush;
    }
 
    /* packet beyond configured mru? */
    if (++sc->sc_ilen > sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN) {
        if (sc->sc_flags & SC_DEBUG)
/*          printf("ppp%d: packet too big\n", sc->sc_if.if_unit);
*/      goto flush;
    }
 
    /* is this mbuf full? */
    m = sc->sc_mc;
    if (M_TRAILINGSPACE(m) <= 0) {
        if (m->m_next == NULL) {
            pppgetm(sc);
            if (m->m_next == NULL) {
                if (sc->sc_flags & SC_DEBUG)
/*                  printf("ppp%d: too few input mbufs!\n", sc->sc_if.if_unit);
*/              goto flush;
            }
        }
        sc->sc_mc = m = m->m_next;
        m->m_len = 0;
        m->m_data = M_DATASTART(m);
        sc->sc_mp = mtod(m, char *);
    }
 
    ++m->m_len;
    *sc->sc_mp++ = c;
    sc->sc_fcs = PPP_FCS(sc->sc_fcs, c);
    return 0;
 
 flush:
    if (!(sc->sc_flags & SC_FLUSH)) {
        sc->sc_if.if_ierrors++;
        sc->sc_stats.ppp_ierrors++;
        sc->sc_flags |= SC_FLUSH;
        if (sc->sc_flags & SC_LOG_FLUSH)
            ppplogchar(sc, c);
    }
    return 0;
}
 
 
void
modem_txDaemon (void *arg)
{
        rtems_event_set events;
        register int level,i,maxonce;
        while (1)
        {
                if (xmt_len==0) //jezeli nic nie ma to czekajmy na event
                        rtems_event_receive(START_TRANSMIT_EVENT|INTERRUPT_EVENT,RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT,&events);
                /* wait for transmit buffer to become empty */
 
                while(_tx_stop) //tu czekamy na start transmisji
                        rtems_event_receive(INTERRUPT_EVENT|START_TRANSMIT_EVENT,RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT,&events);
 
                _CPU_ISR_Disable(level);
                if (*LSR & THRE) //jezeli nie ma transmisji to wyslijmy pierwsze bajty, jezeli jest, same pojda
                {
                        maxonce=(xmt_len>14)?14:xmt_len;
                        if (maxonce>0)
                        {
                                for (i=0;i<maxonce;i++)
                                {
                                        *THR=xmt_buf[xmt_start];
                                        xmt_start=(xmt_start+1)%MODEM_BUFFER_LENGTH;
                                }
                                xmt_len-=maxonce;
                        }
                }
                _CPU_ISR_Enable(level);
                if ((ModemData.t_line==PPPDISC))
                {
                        rtems_bsdnet_semaphore_obtain();
                        modem_sendpacket();
                        rtems_bsdnet_semaphore_release();
                }
 
        }
}
 
static void modem_rxDaemon (void *arg)
{
        rtems_event_set events;
        unsigned char bufor_posr[MODEM_BUFFER_LENGTH];
        register unsigned char ch;
        int level,i,j;
        while(1)
        {
                /* wait for interrupt */
                i=0;
                _CPU_ISR_Disable(level);
                while(rcv_len>0)
                {
                                bufor_posr[i++]=rcv_buf[rcv_start];
                                rcv_start=(rcv_start+1)%MODEM_BUFFER_LENGTH;
                                rcv_len--;
                }
                _CPU_ISR_Enable(level);
                if (ModemData.t_line==PPPDISC)
                {
                        rtems_bsdnet_semaphore_obtain();
                        for(j=0;j<i;j++)
                                pppinput(bufor_posr[j]);
                        rtems_bsdnet_semaphore_release();
                }
                else
                        if (i!=0)rtems_termios_enqueue_raw_characters(modem_tty,bufor_posr,i);
                rtems_event_receive(INTERRUPT_EVENT,RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT,&events);
        }
}
#define CLK_FREQ 1843200
void set_modem_speed(int speed)
{
  *LCR = (char)(DLAB);
  *DLL = (char)((int)(CLK_FREQ/speed/16.0+0.5) & 0xFF);
  *DLM = (char)(((int)(CLK_FREQ/speed/16.0+0.5) & 0xFF00) >> 8);
  *LCR = (char)(WL_8 ); /* 8 bitowe slowo */
}
 
 
static void
modem_init (int speed)  /* port is the SMC number (i.e. 1 or 2) */
{
        set_modem_speed(speed);
  /* Line control setup */
 
  *LCR = (char)(WL_8 ); /* 8 bitowe slowo */
  /* bylo NSB - bylo 2 jest 1*/
 
  /* Interrupt setup */
  *IER = (char) 0x0f;           /* enable transmit, receive, modem stat int */
 
  /* FIFO setup */
  *FCR = (char)(FIFO_E | 0xc0);
 
  /* Modem control setup */
  *MCR = (char) RTS|DTR|OUT2;
 
  /* init tx_stop with CTS */
  _tx_stop = ( (*MDSR & CTS) ? 0 : 1);
}
 
void set_modem_dtr(int how)
{
        unsigned char znak;
        znak=*MCR;
        *MCR=(how)?(znak|DTR):(znak&(~DTR));
}
void modem_status()
{
        unsigned char status;
        status=*MDSR;
 
/*      printf("Modem Status %x ",status);
*/      if (status&CTS)
        {
                _tx_stop=0;
                rtems_event_send (modem_tx_task, START_TRANSMIT_EVENT|INTERRUPT_EVENT);
        }
        else
        {
                _tx_stop=1;
        }
        if (status&DCD)
                _modem_cd=1;
        else
                _modem_cd=0;
}
 
static rtems_isr
modemInterruptHandler (rtems_vector_number v)
{
  register char a,i,ch;
  register int maxonce;
        static errcount = 0;
  for(;;)
  {
          a=*IIR & (NIP | IID_MASK); /* read interrupt id register */
          switch (a) {
                  case 0x04: case 0x0c:
                  /*
                   * Buffer received?
                   */
                while( (*LSR & DR) != 0)
                {
                        ch=*RBR;
                        rcv_buf[(rcv_start+rcv_len)%MODEM_BUFFER_LENGTH]=ch;
                        rcv_len++;
                }
            rtems_event_send (modem_rx_task, INTERRUPT_EVENT);
            break;
          case 0x02:
                  /*
                   * Buffer transmitted ?
                   */
                if (*LSR & THRE) //jezeli nie ma transmisji (a nie powinno byc) to wyslijmy  bajty
                {
                        maxonce=(xmt_len>14)?14:xmt_len;
                        if (maxonce>0)
                        {
                                for (i=0;i<maxonce;i++)
                                {
                                        *THR=xmt_buf[xmt_start];
                                        xmt_start=(xmt_start+1)%MODEM_BUFFER_LENGTH;
                                }
                                xmt_len-=maxonce;
                        }
                }
                rtems_event_send (modem_tx_task, INTERRUPT_EVENT);
           break;
          case 0x00:
                        modem_status();
                        break;
          case 0x01:
                        return;
          case 0x06:
                ch=*RBR;
                errcount++;
                break;
 
                default:
                    break;
          }
  }
}
 
 
void modem_flush(int mode)
{
        if (mode&FWRITE)
        {
        }
        if (mode&FREAD)
        {
   }
 
}
 
 
 
int modemWriteTermios(int minor, const char *buf, int len)
{
        int level;
        int i,maxonce;
        if (len<=0)
                return 0;
 
        if (ModemData.t_line!=PPPDISC)
        {
        _CPU_ISR_Disable(level);
        for(i=0;i<len;i++)
        {
                if (xmt_len>=MODEM_BUFFER_LENGTH)
                        break;
                xmt_buf[(xmt_start+xmt_len)%MODEM_BUFFER_LENGTH]=buf[i];
                xmt_len++;
        }
                _CPU_ISR_Enable(level);
        }
        rtems_event_send(modem_tx_task,START_TRANSMIT_EVENT);
        return i;
}
 
 
/*
 * Initialize and register the device
 */
rtems_device_driver modem_initialize(
  rtems_device_major_number  major,
  rtems_device_minor_number  minor,
  void                      *arg
)
{
        rtems_status_code status;
        rtems_isr_entry old_handler;
        rtems_status_code sc;
   rtems_termios_initialize ();
        sc = rtems_semaphore_create (
                        rtems_build_name ('M', 'D', 'M', 'P'),
                        0,
                        RTEMS_COUNTING_SEMAPHORE,
                        RTEMS_NO_PRIORITY_CEILING,
                        &ModemData.pppsem);
        if (sc != RTEMS_SUCCESSFUL)
                rtems_fatal_error_occurred (sc);
        modem_init(9600);
 
        sc = rtems_interrupt_catch (modemInterruptHandler,
                                                PPC_IRQ_IRQ4,
                                                &old_handler);
 
        /*
         * Register the devices
         */
        modem_tx_task=0;
        modem_rx_task=0;
        status = rtems_io_register_name ("/dev/modem", major, 0);
        if (status != RTEMS_SUCCESSFUL)
                rtems_fatal_error_occurred (status);
        return RTEMS_SUCCESSFUL;
}
 
rtems_device_driver modem_first_open(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
        modem_tty=(struct rtems_termios_tty *)(((rtems_libio_open_close_args_t *)arg)->iop->data1);
        return RTEMS_SUCCESSFUL;
}
rtems_device_driver modem_last_close(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
  m823.siu.simask &=(~M823_SIMASK_IRM4); /* block the interrupts */
        return RTEMS_SUCCESSFUL;
}
 
static int
modemSetAttr(int minor, const struct termios *t)
{
  int baud;
 
  switch (t->c_cflag & CBAUD)
    {
    case B50:
      baud = 50;
      break;
    case B75:
      baud = 75;
      break;
    case B110:
      baud = 110;
      break;
    case B134:
      baud = 134;
      break;
    case B150:
      baud = 150;
      break;
    case B200:
      baud = 200;
      break;
    case B300:
      baud = 300;
      break;
    case B600:
      baud = 600;
      break;
    case B1200:
      baud = 1200;
      break;
    case B1800:
      baud = 1800;
      break;
    case B2400:
      baud = 2400;
      break;
    case B4800:
      baud = 4800;
      break;
    case B9600:
      baud = 9600;
      break;
    case B19200:
      baud = 19200;
      break;
    case B38400:
      baud = 38400;
      break;
    case B57600:
      baud = 57600;
      break;
    case B115200:
      baud = 115200;
      break;
    default:
      baud = 0;
      rtems_fatal_error_occurred (RTEMS_INTERNAL_ERROR);
      return 0;
    }
        set_modem_speed(baud);
        return RTEMS_SUCCESSFUL;
}
 
 
/*
 * Open the device
 */
 
 
 
rtems_device_driver modem_open(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
    int error, s;
  rtems_status_code              status;
   register struct ppp_softc *sc;
  static rtems_termios_callbacks cb =
  {
    modem_first_open,                 /* firstOpen */
    modem_last_close,       /* lastClose */
    NULL,                     /* poll read  */
    modemWriteTermios, /* write */
    modemSetAttr,                     /* setAttributes */
    NULL,                     /* stopRemoteTx */
    NULL,                     /* startRemoteTx */
 
  };
 
        if (ModemData.t_line == PPPDISC)
        {
                sc = ModemData.t_sc;
                if (sc != NULL && sc->sc_devp == (void *) &ModemData)
                {
                        return (0);
                }
        }
 
        if ((ModemData.t_sc= sc = pppalloc(1)) == NULL)
                return 2;
 
    if (sc->sc_relinq)
        (*sc->sc_relinq)(sc);   /* get previous owner to relinquish the unit */
 
    sc->sc_ilen = 0;
    sc->sc_m = NULL;
    bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
    sc->sc_asyncmap[0] = 0xffffffff;
    sc->sc_asyncmap[3] = 0x60000000;
    sc->sc_rasyncmap = 0;
    sc->sc_devp = &ModemData;
    sc->sc_start = pppasyncstart;
    sc->sc_ctlp = pppasyncctlp;
    sc->sc_relinq = pppasyncrelinq;
    sc->sc_outm = NULL;
    pppgetm(sc);
    sc->sc_if.if_flags |= IFF_RUNNING;
    sc->sc_if.if_baudrate = 38400;
 
        status = rtems_termios_open (major, minor, arg, &cb);
  if(status != RTEMS_SUCCESSFUL)
    {
/*      printf("Error openning console device\n");
*/      return status;
    }
 
 
/* init rx and tx task for device */
        xmt_start=xmt_len=0;
        rcv_start=rcv_len=0;
 
        if (modem_rx_task==0 && modem_tx_task==0)
        {
        rtems_status_code sc;
        sc = rtems_task_create (rtems_build_name ('M', 'D', 't', 'x'),
                        101,
                        16*1024,
                        RTEMS_PREEMPT|RTEMS_TIMESLICE|RTEMS_NO_ASR|RTEMS_INTERRUPT_LEVEL(0),
                        RTEMS_NO_FLOATING_POINT|RTEMS_LOCAL,
                        &modem_tx_task);
        if (sc != RTEMS_SUCCESSFUL) {
 
        }
 
        sc = rtems_task_start (modem_tx_task, (void *)modem_txDaemon, 0);
        if (sc != RTEMS_SUCCESSFUL) {
 
        }
 
        sc = rtems_task_create (rtems_build_name ('M', 'D', 'r', 'x'),
                        101,
                        16*1024,
                        RTEMS_PREEMPT|RTEMS_TIMESLICE|RTEMS_NO_ASR|RTEMS_INTERRUPT_LEVEL(0),
                        RTEMS_NO_FLOATING_POINT|RTEMS_LOCAL,
                        &modem_rx_task);
        if (sc != RTEMS_SUCCESSFUL) {
 
        }
 
        sc = rtems_task_start (modem_rx_task, (void *)modem_rxDaemon, 0);
        if (sc != RTEMS_SUCCESSFUL) {
 
        }
 
        }
  /* Enable modem interrupts */
  m823.siu.simask |= M823_SIMASK_IRM4;
 
  return RTEMS_SUCCESSFUL;
}
 
/*
 * Close the device
 */
rtems_device_driver modem_close(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
    register struct ppp_softc *sc;
    modem_flush( FREAD|FWRITE);
 
    ModemData.t_line = 0;
    sc = ModemData.t_sc;
    if (sc != NULL) {
                ModemData.t_sc = NULL;
                if (&ModemData == (struct tty *) sc->sc_devp) {
                rtems_bsdnet_semaphore_obtain();
            pppasyncrelinq(sc);
            pppdealloc(sc);
                rtems_bsdnet_semaphore_release();
        }
    }
    return RTEMS_SUCCESSFUL;
}
 
/* for now works only as serial device */
 
 
rtems_device_driver modem_read(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
  rtems_libio_rw_args_t *rw_args=  (rtems_libio_rw_args_t *)arg;
  char *buffer;
  int count=0,maximum;
  rtems_status_code              sc;
 
  buffer = rw_args->buffer;
  maximum = rw_args->count;
  if (ModemData.t_line==PPPDISC)
  {
 
    struct mbuf *m, *m0;
    register int s;
    int error = 0;
    rtems_status_code status;
    rtems_interval    ticks;
        register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc;
         ticks=1000000/rtems_bsdnet_microseconds_per_tick;
 
    if (sc == NULL)
        return 0;
    /*
     * Loop waiting for input, checking that nothing disasterous
     * happens in the meantime.
     */
    for (;;) {
                if (sc->sc_inq.ifq_head != NULL)
                {
/*            printf("Read : Dane sa w buforze\n");
*/                      break;
                }
/*      printf("Read : Czekam na dane\n");
*/
                status=rtems_semaphore_obtain(ModemData.pppsem,RTEMS_WAIT,ticks);
                if (_modem_cd==0)
                {
                        rw_args->bytes_moved =0;
                        return RTEMS_SUCCESSFUL;
                }
 
                if (status==RTEMS_TIMEOUT)
                        return status;
        }
        rtems_bsdnet_semaphore_obtain();
    IF_DEQUEUE(&sc->sc_inq, m0);
        rtems_bsdnet_semaphore_release();
 
  for (m = m0; m && (count+m->m_next->m_len<maximum); m = m->m_next) /* check if packet will fit in buffer */
  {
                memcpy(buffer,mtod(m, u_char *),m->m_len);
                count+=m->m_len;
                buffer+=m->m_len;
  }
   m_freem(m0);
  rw_args->bytes_moved = count;
 
  }
        else
                  sc = rtems_termios_read (arg);
 
  count=rw_args->bytes_moved;
  return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
}
 
/*
 * Write to the device
 */
rtems_device_driver modem_write(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
  int count,len;
  rtems_libio_rw_args_t *rw_args;
  char *out_buffer;
  int n,maximum;
  rw_args = (rtems_libio_rw_args_t *) arg;
 
  out_buffer = rw_args->buffer;
  maximum = rw_args->count;
 
        if (ModemData.t_line==PPPDISC)
        {
                register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc;
           struct sockaddr dst;
                struct mbuf *m, *m0, **mp;
                rtems_bsdnet_semaphore_obtain();
                for (mp = &m0; maximum; mp = &m->m_next)
                {
                        MGET(m, M_WAIT, MT_DATA);
                        if ((*mp = m) == NULL)
                        {
                                rtems_bsdnet_semaphore_release();
                            m_freem(m0);
                            return (ENOBUFS);
                        }
                        m->m_len = 0;
                        if (maximum>= MCLBYTES / 2)
                    MCLGET(m, M_DONTWAIT);
                        len = M_TRAILINGSPACE(m);
                        if (len > maximum)
                        {
                                memcpy(mtod(m, u_char *),out_buffer,maximum);
                                m->m_len=maximum;
                                maximum=0;
                        }
                        else
                        {
                                memcpy(mtod(m, u_char *),out_buffer,len);
                                maximum-=len;
                                m->m_len=len;
                                out_buffer+=len;
                        }
                }
 
            dst.sa_family = AF_UNSPEC;
            bcopy(mtod(m0, u_char *), dst.sa_data, PPP_HDRLEN);
            m0->m_data += PPP_HDRLEN;
            m0->m_len -= PPP_HDRLEN;
 
/*              printf("Wysylam %d bajtow \n",m0->m_len);
*/              n=pppoutput(&sc->sc_if, m0, &dst, (struct rtentry *)0);
                rtems_bsdnet_semaphore_release();
                return n;
        }
        else
           return rtems_termios_write (arg);
}
 
 
 
/*
 * Handle ioctl request.
 * Should set hardware line speed, bits/char, etc.
 */
rtems_device_driver modem_control(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
        rtems_libio_ioctl_args_t *args=(rtems_libio_ioctl_args_t *)arg;
        struct ppp_softc *sc=ModemData.t_sc;
    int cmd;
    caddr_t data;
    int error=RTEMS_SUCCESSFUL;
 
        data=args->buffer;
        cmd=args->command;
 
    switch (cmd) {
        case RTEMS_IO_GET_ATTRIBUTES:
        case RTEMS_IO_SET_ATTRIBUTES:
        case RTEMS_IO_TCDRAIN:
                return rtems_termios_ioctl (arg);
        break;
   case PPPIOCSASYNCMAP:
                sc->sc_asyncmap[0] = *(u_int *)data;
                break;
 
   case PPPIOCGASYNCMAP:
                *(u_int *)data = sc->sc_asyncmap[0];
        break;
 
        case PPPIOCSRASYNCMAP:
                sc->sc_rasyncmap = *(u_int *)data;
        break;
 
        case TIOCSETD:
                ModemData.t_line=*(int*)data;
        break;
        case TIOCGETD:
                *(int*)data=ModemData.t_line;
        break;
        case TIOCMBIS:
                if ((*(int*)data)&TIOCM_DTR)
                        set_modem_dtr(1);
                break;
        case TIOCMBIC:
                if ((*(int*)data)&TIOCM_DTR)
                        set_modem_dtr(0);
                break;
   case PPPIOCGRASYNCMAP:
                *(u_int *)data = sc->sc_rasyncmap;
        break;
 
        case PPPIOCSXASYNCMAP:
                bcopy(data, sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
                sc->sc_asyncmap[1] = 0;              /* mustn't escape 0x20 - 0x3f */
                sc->sc_asyncmap[2] &= ~0x40000000;  /* mustn't escape 0x5e */
                sc->sc_asyncmap[3] |= 0x60000000;   /* must escape 0x7d, 0x7e */
                break;
 
   case PPPIOCGXASYNCMAP:
                bcopy(sc->sc_asyncmap, data, sizeof(sc->sc_asyncmap));
                break;
 
        default:
        rtems_bsdnet_semaphore_obtain();
        error = pppioctl(sc, cmd, data, 0, NULL);
                if (error == 0 && cmd == PPPIOCSMRU)
                        pppgetm(sc);
        rtems_bsdnet_semaphore_release();
 
        }
        return error;
 
}
 
 
 
void
wait_input(timo)
    struct timeval *timo;
{
    int n;
    rtems_event_set events;
    rtems_interval    ticks;
  rtems_status_code              err;
        int czekaj=1;
    register struct ppp_softc *sc = (struct ppp_softc *)ModemData.t_sc;
    ticks = 1+(timo->tv_sec*1000000+timo->tv_usec)/rtems_bsdnet_microseconds_per_tick;
        while (czekaj)
        {
 
                if (sc->sc_inq.ifq_head != NULL)
                        break;
/*      printf("Wait : Czekam na dane przez %d ticks\n",ticks);
*/              err=rtems_semaphore_obtain(ModemData.pppsem,RTEMS_WAIT,ticks);
                if (err==RTEMS_TIMEOUT)
                {
/*                      printf("TIMEOUT :Brak danych\n");
*/                      break;
                }
        }
 
}
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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [pppd/] [modem_example/] [modem.c] - Blame information for rev 773

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* Modem device driver for RTEMS`
3			`* Author: Tomasz Domin (dot@comarch.pl)`
4			`* Copyright (C) 1998 by ComArch SA`
5			`* Driver will use termios for character output and ppp specific out procecedures for network protocols`
6			`*/`
7
8			`#include <bsp.h>`
9			`#include <rtems.h>`
10			`#include <rtems/libio.h>`
11			`#include <sys/ttycom.h>`
12			`#include <unistd.h>`
13			`#include <sys/errno.h>`
14			`#include <rtems/rtems/event.h>`
15			`#include <rtems/rtems/tasks.h>`
16			`#include <mpc823.h>`
17			`#include <sys/param.h>`
18			`#include <sys/systm.h>`
19			`#include <sys/proc.h>`
20			`#include <sys/mbuf.h>`
21			`#include <sys/socket.h>`
22			`#include <sys/ioctl.h>`
23			`#include <sys/file.h>`
24
25			`#include <sys/kernel.h>`
26			`#include <sys/conf.h>`
27			`#include <net/if.h>`
28			`#include <net/ppp_defs.h>`
29			`#include <sys/fcntl.h>`
30			`#include "ppp.h"`
31			`#include <net/if_pppvar.h>`
32			`#include <net/if_ppp.h>`
33			`/* RTEMS specific */`
34			`rtems_id modem_task_id;`
35			`#include "16550.h"`
36			`#include <mpc823.h>`
37			`#define ESCAPE_P(c) (sc->sc_asyncmap[(c) >> 5] & (1 << ((c) & 0x1F)))`
38			`#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)`
39
40			`#define M_DATASTART(m) \`