s3c44b0xsio.c

VxWorks BSP for S3C44B0X

/*******************************************************************************
*
* s3c44b0xHup - hang up the modem control lines 
*
* Resets the RTS and DTR signals.
*
* RETURNS: OK
*/

LOCAL STATUS s3c44b0xHup
    (
    S3C44B0X_CHAN * pChan     /* pointer to channel */
    )
    {
    int     oldlevel;    /* current interrupt level mask */

    oldlevel = intLock ();

    /* set RTS and DTR low */

    intUnlock (oldlevel);

    return (OK);

    }    

/*******************************************************************************
*
* s3c44b0xOpen - Set the modem control lines 
*
* Set the modem control lines(RTS, DTR) TRUE if not already set.  
*
* RETURNS: OK
*/

LOCAL STATUS s3c44b0xOpen
    (
    S3C44B0X_CHAN * pChan     /* pointer to channel */
    )
    {
    FAST int     oldlevel;    /* current interrupt level mask */

    oldlevel = intLock ();

    /* set RTS and DTR active */

    intUnlock (oldlevel);

    return (OK);
    }

/******************************************************************************
*
* s3c44b0xOptSet - set hardware options
*
* This routine sets up the hardware according to the specified option
* argument.  If the hardware cannot support a particular option value, then
* it should ignore that portion of the request.
*
* RETURNS: OK upon success, or EIO for invalid arguments.
*/

LOCAL int s3c44b0xOptSet
    (
    S3C44B0X_CHAN * pChan,        /* channel */
    uint_t    newOpts              /* new options */
    )
    {

    UINT8 dataBits = 0x03;
    UINT8 stopBits = 0x00;
    BOOL hdweFlowCtrl=TRUE;
    BOOL rcvrEnable = TRUE;
    int  lvl;
    UINT8 temp=PARITY_NONE;
    UINT32 result;    

    if (pChan == NULL || newOpts & 0xffffff00)
    return EIO;

    /* do nothing if options already set */

    if (pChan->options == newOpts)
    return OK;

    /* ignore requests for unsupported options */

    /* decode individual request elements */

    switch (newOpts & CSIZE)
    {
    case CS5:
        dataBits = 0x00; break;
    case CS6:
        dataBits = 0x01; break;
    case CS7:
        dataBits = 0x02; break;
    default:
    case CS8:
        dataBits = 0x03; break;
    }

    if (newOpts & STOPB)
        stopBits = 0x04;
    else
        stopBits = 0x00;

    switch (newOpts & (PARENB|PARODD))
    {
    case PARENB|PARODD:
        /* enable odd parity */
            temp=PARITY_ODD;
        break;

    case PARENB:
        /* enable even parity */
        temp=PARITY_EVEN; 
        break;

    case PARODD:
        /* invalid mode, not normally used. */
        break;

    default:
    case 0:
        temp=PARITY_NONE ;/* no parity */
        break;
    }

    if (newOpts & CLOCAL)
    {
        /* clocal disables hardware flow control */
        hdweFlowCtrl = FALSE;
    }

    if ((newOpts & CREAD) == 0)
        rcvrEnable = FALSE;

    lvl = intLock ();

    /*
     * Reset the device according to dataBits, stopBits, hdweFlowCtrl,
     * rcvrEnable, and parity selections.
     */
    
    S3C44B0X_SIO_REG_READ(pChan, S3C44B0X_ULCON, result);    
    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_ULCON,(result|dataBits|temp|stopBits));

    intUnlock (lvl);

    pChan->options = newOpts;

    return (OK);
    }

/*******************************************************************************
*
* s3c44b0xIoctl - special device control
*
* This routine handles the IOCTL messages from the user. It supports commands 
* to get/set baud rate, mode(INT,POLL), hardware options(parity, number of 
* data bits) and modem control(RTS/CTS and DTR/DSR handshakes).
* The ioctl commands SIO_HUP and SIO_OPEN are used to implement the HUPCL(hang
* up on last close) function.
*
* As on a UNIX system, requesting a baud rate of zero is translated into
* a hangup request.  The DTR and RTS lines are dropped.  This should cause
* a connected modem to drop the connection.  The SIO_HUP command will only
* hangup if the HUPCL option is active.  The SIO_OPEN function will raise
* DTR and RTS lines whenever it is called. Use the BAUD_RATE=0 function
* to hangup when HUPCL is not active.
*
* The CLOCAL option will disable hardware flow control.  When selected,
* hardware flow control is not used.  When not selected hardware flow control
* is based on the RTS/CTS signals.  CTS is the clear to send input
* from the other end.  It must be true for this end to begin sending new
* characters.  In most drivers, the RTS signal will be assumed to be connected
* to the opposite end's CTS signal and can be used to control output from
* the other end.  Raising RTS asserts CTS at the other end and the other end
* can send data.  Lowering RTS de-asserts CTS and the other end will stop
* sending data. (This is non-EIA defined use of RTS).
*
* RETURNS: OK on success, ENOSYS on unsupported request, EIO on failed
* request.
*/

LOCAL int s3c44b0xIoctl
    (
    SIO_CHAN *    pSioChan,        /* device to control */
    int        request,        /* request code */
    void *    someArg            /* some argument */
    )
    {
    S3C44B0X_CHAN *pChan = (S3C44B0X_CHAN *) pSioChan;
    int     oldlevel;        /* current interrupt level mask */
    int     arg = (int)someArg;

    switch (request)
    {
    case SIO_BAUD_SET:
        /*
         * like unix, a baud request for 0 is really a request to
         * hangup.
         */

        if (arg == 0)
        return s3c44b0xHup (pChan);

        /*
         * Set the baud rate. Return EIO for an invalid baud rate, or
         * OK on success.
         */

        if (arg < S3C44B0X_BAUD_MIN || arg > S3C44B0X_BAUD_MAX)
            {
        return (EIO);
            }

        /* Calculate the baud rate constant for the new baud rate */
            switch(arg)
                {
                case 1200:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_1200|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 2400:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_2400|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 4800:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_4800|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 9600:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_9600|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 19200:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_19200|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 38400:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_38400|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 57600:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_57600|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                case 115200:
                    /* disable interrupts during chip access */
                    oldlevel = intLock ();
                    S3C44B0X_SIO_REG_WRITE(pChan,S3C44B0X_UBRDIV,S3C44B0X_CNT0_115200|S3C44B0X_CNT1_VAL);
                    intUnlock (oldlevel);
                    pChan->baudRate=arg;
                    return (OK);

                default:
                    return(EIO);

                }
            break;

    case SIO_BAUD_GET:

            /* Get the baud rate and return OK */
            *(int *)arg = pChan->baudRate;
            break;

    case SIO_MODE_SET:

        /*
         * Set the mode (e.g., to interrupt or polled). Return OK
         * or EIO for an unknown or unsupported mode.
         */

        return (s3c44b0xModeSet (pChan, arg));

    case SIO_MODE_GET:

        /* Get the current mode and return OK.  */

        *(int *)arg = pChan->mode;
        return (OK);

    case SIO_AVAIL_MODES_GET:

        /* Get the available modes and return OK.  */

        *(int *)arg = SIO_MODE_INT | SIO_MODE_POLL; 
        return (OK);

    case SIO_HW_OPTS_SET:

        /*
         * Optional command to set the hardware options (as defined
         * in sioLib.h).
         * Return OK, or ENOSYS if this command is not implemented.
         * Note: several hardware options are specified at once.
         * This routine should set as many as it can and then return
         * OK. The SIO_HW_OPTS_GET is used to find out which options
         * were actually set.
         */

        return (s3c44b0xOptSet (pChan, arg));

    case SIO_HW_OPTS_GET:

        /*
         * Optional command to get the hardware options (as defined
         * in sioLib.h). Return OK or ENOSYS if this command is not
         * implemented.  Note: if this command is unimplemented, it
         * will be assumed that the driver options are CREAD | CS8
         * (e.g., eight data bits, one stop bit, no parity, ints enabled).
         */

        *(int *)arg = pChan->options;
        return (OK);

    case SIO_HUP:

            /* check if hupcl option is enabled */

            if (pChan->options & HUPCL) 
                return (s3c44b0xHup (pChan));
            return (OK);

    case SIO_OPEN:
            return (s3c44b0xOpen (pChan)); /* always open */

    default:
        return (ENOSYS);
    }
    return (ENOSYS);
    }

/*******************************************************************************
*
* dummyCallback - dummy callback routine
*
* RETURNS: ERROR.
*/

LOCAL STATUS dummyCallback (void)
    {
    return (ERROR);
    }