moxa.c

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 *	9.  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);      *
 *	10. MoxaPortLineCtrl(int port, int dtrState, int rtsState);	     *
 *	11. MoxaPortFlowCtrl(int port, int rts, int cts, int rx, int tx,int xany);    *
 *	12. MoxaPortLineStatus(int port);				     *
 *	13. MoxaPortDCDChange(int port);				     *
 *	14. MoxaPortDCDON(int port);					     *
 *	15. MoxaPortFlushData(int port, int mode);	                     *
 *	16. MoxaPortWriteData(int port, unsigned char * buffer, int length); *
 *	17. MoxaPortReadData(int port, unsigned char * buffer, int length);  *
 *	18. MoxaPortTxBufSize(int port);				     *
 *	19. MoxaPortRxBufSize(int port);				     *
 *	20. MoxaPortTxQueue(int port);					     *
 *	21. MoxaPortTxFree(int port);					     *
 *	22. MoxaPortRxQueue(int port);					     *
 *	23. MoxaPortRxFree(int port);					     *
 *	24. MoxaPortTxDisable(int port);				     *
 *	25. MoxaPortTxEnable(int port); 				     *
 *	26. MoxaPortGetBrkCnt(int port);				     *
 *	27. MoxaPortResetBrkCnt(int port);				     *
 *	28. MoxaPortSetXonXoff(int port, int xonValue, int xoffValue);	     *
 *	29. MoxaPortIsTxHold(int port); 				     *
 *	30. MoxaPortSendBreak(int port, int ticks);			     *
 *****************************************************************************/
/*
 *    Moxa Port Number Description:
 *
 *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
 *      the port number using in MOXA driver functions will be 0 to 31 for
 *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
 *      to 127 for fourth. For example, if you setup three MOXA boards,
 *      first board is C218, second board is C320-16 and third board is
 *      C320-32. The port number of first board (C218 - 8 ports) is from
 *      0 to 7. The port number of second board (C320 - 16 ports) is form
 *      32 to 47. The port number of third board (C320 - 32 ports) is from
 *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
 *      127 will be invalid.
 *
 *
 *      Moxa Functions Description:
 *
 *      Function 1:     Driver initialization routine, this routine must be
 *                      called when initialized driver.
 *      Syntax:
 *      void MoxaDriverInit();
 *
 *
 *      Function 2:     Moxa driver private IOCTL command processing.
 *      Syntax:
 *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
 *
 *           unsigned int cmd   : IOCTL command
 *           unsigned long arg  : IOCTL argument
 *           int port           : port number (0 - 127)
 *
 *           return:    0  (OK)
 *                      -EINVAL
 *                      -ENOIOCTLCMD
 *
 *
 *      Function 3:     Moxa driver polling process routine.
 *      Syntax:
 *      int  MoxaDriverPoll(void);
 *
 *           return:    0       ; polling O.K.
 *                      -1      : no any Moxa card.             
 *
 *
 *      Function 4:     Get the ports of this card.
 *      Syntax:
 *      int  MoxaPortsOfCard(int cardno);
 *
 *           int cardno         : card number (0 - 3)
 *
 *           return:    0       : this card is invalid
 *                      8/16/24/32
 *
 *
 *      Function 5:     Check this port is valid or invalid
 *      Syntax:
 *      int  MoxaPortIsValid(int port);
 *           int port           : port number (0 - 127, ref port description)
 *
 *           return:    0       : this port is invalid
 *                      1       : this port is valid
 *
 *
 *      Function 6:     Enable this port to start Tx/Rx data.
 *      Syntax:
 *      void MoxaPortEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 7:     Disable this port
 *      Syntax:
 *      void MoxaPortDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 8:     Get the maximun available baud rate of this port.
 *      Syntax:
 *      long MoxaPortGetMaxBaud(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : this port is invalid
 *                      38400/57600/115200 bps
 *
 *
 *      Function 9:     Get the current baud rate of this port.
 *      Syntax:
 *      long MoxaPortGetCurBaud(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : this port is invalid
 *                      50 - 115200 bps
 *
 *
 *      Function 10:    Setting baud rate of this port.
 *      Syntax:
 *      long MoxaPortSetBaud(int port, long baud);
 *           int port           : port number (0 - 127)
 *           long baud          : baud rate (50 - 115200)
 *
 *           return:    0       : this port is invalid or baud < 50
 *                      50 - 115200 : the real baud rate set to the port, if
 *                                    the argument baud is large than maximun
 *                                    available baud rate, the real setting
 *                                    baud rate will be the maximun baud rate.
 *
 *
 *      Function 11:    Setting the data-bits/stop-bits/parity of this port
 *      Syntax:
 *      int  MoxaPortSetMode(int port, int databits, int stopbits, int parity);
 *           int port           : port number (0 - 127)
 *           int databits       : data bits (8/7/6/5)
 *           int stopbits       : stop bits (2/1/0, 0 show 1.5 stop bits)
 int parity     : parity (0:None,1:Odd,2:Even,3:Mark,4:Space)
 *
 *           return:    -1      : invalid parameter
 *                      0       : setting O.K.
 *
 *
 *      Function 12:    Configure the port.
 *      Syntax:
 *      int  MoxaPortSetTermio(int port, struct termios *termio);
 *           int port           : port number (0 - 127)
 *           struct termios * termio : termio structure pointer
 *
 *           return:    -1      : this port is invalid or termio == NULL
 *                      0       : setting O.K.
 *
 *
 *      Function 13:    Get the DTR/RTS state of this port.
 *      Syntax:
 *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
 *           int port           : port number (0 - 127)
 *           int * dtrState     : pointer to INT to receive the current DTR
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *           int * rtsState     : pointer to INT to receive the current RTS
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *
 *           return:    -1      : this port is invalid
 *                      0       : O.K.
 *
 *
 *      Function 14:    Setting the DTR/RTS output state of this port.
 *      Syntax:
 *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
 *           int port           : port number (0 - 127)
 *           int dtrState       : DTR output state (0: off, 1: on)
 *           int rtsState       : RTS output state (0: off, 1: on)
 *
 *
 *      Function 15:    Setting the flow control of this port.
 *      Syntax:
 *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
 *                            int txFlow,int xany);
 *           int port           : port number (0 - 127)
 *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
 *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
 *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
 *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
 *           int xany           : S/W XANY flow control (0: no, 1: yes)
 *
 *
 *      Function 16:    Get ths line status of this port
 *      Syntax:
 *      int  MoxaPortLineStatus(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    Bit 0 - CTS state (0: off, 1: on)
 *                      Bit 1 - DSR state (0: off, 1: on)
 *                      Bit 2 - DCD state (0: off, 1: on)
 *
 *
 *      Function 17:    Check the DCD state has changed since the last read
 *                      of this function.
 *      Syntax:
 *      int  MoxaPortDCDChange(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : no changed
 *                      1       : DCD has changed
 *
 *
 *      Function 18:    Check ths current DCD state is ON or not.
 *      Syntax:
 *      int  MoxaPortDCDON(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : DCD off
 *                      1       : DCD on
 *
 *
 *      Function 19:    Flush the Rx/Tx buffer data of this port.
 *      Syntax:
 *      void MoxaPortFlushData(int port, int mode);
 *           int port           : port number (0 - 127)
 *           int mode    
 *                      0       : flush the Rx buffer 
 *                      1       : flush the Tx buffer 
 *                      2       : flush the Rx and Tx buffer 
 *
 *
 *      Function 20:    Write data.
 *      Syntax:
 *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
 *           int port           : port number (0 - 127)
 *           unsigned char * buffer     : pointer to write data buffer.
 *           int length         : write data length
 *
 *           return:    0 - length      : real write data length
 *
 *
 *      Function 21:    Read data.
 *      Syntax:
 *      int  MoxaPortReadData(int port, unsigned char * buffer, int length);
 *           int port           : port number (0 - 127)
 *           unsigned char * buffer     : pointer to read data buffer.
 *           int length         : read data buffer length
 *
 *           return:    0 - length      : real read data length
 *
 *
 *      Function 22:    Get the Tx buffer size of this port
 *      Syntax:
 *      int  MoxaPortTxBufSize(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer size
 *
 *
 *      Function 23:    Get the Rx buffer size of this port
 *      Syntax:
 *      int  MoxaPortRxBufSize(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer size
 *
 *
 *      Function 24:    Get the Tx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortTxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current queued data bytes
 *
 *
 *      Function 25:    Get the Tx buffer current free space
 *      Syntax:
 *      int  MoxaPortTxFree(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current free space
 *
 *
 *      Function 26:    Get the Rx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortRxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer current queued data bytes
 *
 *
 *      Function 27:    Get the Rx buffer current free space
 *      Syntax:
 *      int  MoxaPortRxFree(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer current free space
 *
 *
 *      Function 28:    Disable port data transmission.
 *      Syntax:
 *      void MoxaPortTxDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 29:    Enable port data transmission.
 *      Syntax:
 *      void MoxaPortTxEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 30:    Get the received BREAK signal count.
 *      Syntax:
 *      int  MoxaPortGetBrkCnt(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0 - ..  : BREAK signal count
 *
 *
 *      Function 31:    Get the received BREAK signal count and reset it.
 *      Syntax:
 *      int  MoxaPortResetBrkCnt(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0 - ..  : BREAK signal count
 *
 *
 *      Function 32:    Set the S/W flow control new XON/XOFF value, default
 *                      XON is 0x11 & XOFF is 0x13.
 *      Syntax:
 *      void MoxaPortSetXonXoff(int port, int xonValue, int xoffValue);
 *           int port           : port number (0 - 127)
 *           int xonValue       : new XON value (0 - 255)
 *           int xoffValue      : new XOFF value (0 - 255)
 *
 *
 *      Function 33:    Check this port's transmission is hold by remote site
 *                      because the flow control.
 *      Syntax:
 *      int  MoxaPortIsTxHold(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : normal
 *                      1       : hold by remote site
 *
 *
 *      Function 34:    Send out a BREAK signal.
 *      Syntax:
 *      void MoxaPortSendBreak(int port, int ms100);
 *           int port           : port number (0 - 127)
 *           int ms100          : break signal time interval.
 *                                unit: 100 mini-second. if ms100 == 0, it will
 *                                send out a about 250 ms BREAK signal.
 *
 */
int MoxaPortIsValid(int port)
{

	if (moxaCard == 0)
		return (0);
	if (moxaChkPort[port] == 0)
		return (0);
	return (1);
}

void MoxaPortEnable(int port)
{
	unsigned long ofsAddr;
	int MoxaPortLineStatus(int);
	short lowwater = 512;

	ofsAddr = moxaTableAddr[port];
	writew(lowwater, ofsAddr + Low_water);
	moxaBreakCnt[port] = 0;
	if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
	    (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI)) {
		moxafunc(ofsAddr, FC_SetBreakIrq, 0);
	} else {
		writew(readw(ofsAddr + HostStat) | WakeupBreak, ofsAddr + HostStat);
	}

	moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
	moxafunc(ofsAddr, FC_FlushQueue, 2);

	moxafunc(ofsAddr, FC_EnableCH, Magic_code);
	MoxaPortLineStatus(port);
}

void MoxaPortDisable(int port)
{
	unsigned long ofsAddr;

	ofsAddr = moxaTableAddr[port];
	moxafunc(ofsAddr, FC_SetFlowCtl, 0);	/* disable flow control */
	moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
	writew(0, ofsAddr + HostStat);
	moxafunc(ofsAddr, FC_DisableCH, Magic_code);
}

long MoxaPortGetMaxBaud(int port)
{
	if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
	    (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI))
		return (460800L);
	else
		return (921600L);
}


long MoxaPortSetBaud(int port, long baud)
{
	unsigned long ofsAddr;
	long max, clock;
	unsigned int val;

	if ((baud < 50L) || ((max = MoxaPortGetMaxBaud(port)) == 0))
		return (0);
	ofsAddr = moxaTableAddr[port];
	if (baud > max)
		baud = max;
	if (max == 38400L)
		clock = 614400L;	/* for 9.8304 Mhz : max. 38400 bps */
	else if (max == 57600L)
		clock = 691200L;	/* for 11.0592 Mhz : max. 57600 bps */
	else
		clock = 921600L;	/* for 14.7456 Mhz : max. 115200 bps */
	val = clock / baud;
	moxafunc(ofsAddr, FC_SetBaud, val);
	baud = clock / val;
	moxaCurBaud[port] = baud;
	return (baud);
}

int MoxaPortSetTermio(int port, struct termios *termio)
{
	unsigned long ofsAddr;
	tcflag_t cflag;
	long baud;
	tcflag_t mode = 0;

	if (moxaChkPort[port] == 0 || termio == 0)
		return (-1);
	ofsAddr = moxaTableAddr[port];
	cflag = termio->c_cflag;	/* termio->c_cflag */

	mode = termio->c_cflag & CSIZE;
	if (mode == CS5)
		mode = MX_CS5;
	else if (mode == CS6)
		mode = MX_CS6;
	else if (mode == CS7)
		mode = MX_CS7;
	else if (mode == CS8)
		mode = MX_CS8;

	if (termio->c_cflag & CSTOPB) {
		if (mode == MX_CS5)
			mode |= MX_STOP15;
		else
			mode |= MX_STOP2;
	} else
		mode |= MX_STOP1;

	if (termio->c_cflag & PAR