/*
* 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 */
0 /* outputUsesInterrupts */
};
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;
}
}
}