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/**

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 * rt_com

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 * ======

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 *

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 * RT-Linux kernel module for communication across serial lines.

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 *

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 * Copyright (C) 1997 Jens Michaelsen

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 * Copyright (C) 1997-2000 Jochen Kupper

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 * Copyright (C) 1999 Hua Mao <hmao@nmt.edu>

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public License as

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 * published by the Free Software Foundation; either version 2 of the

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 * License, or (at your option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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 * General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License

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 * along with this program; see the file License. if not, write to the

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 * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,

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 * MA 02111-1307, USA.

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 */

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#ifndef AIP_COM_P_H

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#define AIP_COM_P_H

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#define RT_COM_NAME "rt_com(aip)"  //Hm, IgH

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/* input/ouput buffer (FIFO) sizes */

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#define RT_COM_BUF_SIZ        256	// MUST BE ONLY POWER OF 2 !!

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/* amount of free space on input buffer for RTS reset */

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#define RT_COM_BUF_LOW        (RT_COM_BUF_SIZ / 3)

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/* amount of free space on input buffer for RTS set */

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#define RT_COM_BUF_HI         (RT_COM_BUF_SIZ * 2 / 3)

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/* limit of free space on input buffer for buffer full error */

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#define RT_COM_BUF_FULL       20

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/* usage flags */

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#define RT_COM_PORT_FREE      0x00

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#define RT_COM_PORT_INUSE     0x01

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#define RT_COM_PORT_SETUP     0x02

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/* Some hardware description */

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#define RT_COM_BASE_BAUD      115200

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/** Interrupt Service Routines

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 * These are private functions */

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static void rt_com0_isr( void );

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static void rt_com1_isr( void );

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/** Interrupt handling

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 *

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 * Define internal convinience macros for interrupt handling, so we

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 * get rid of the system dependencies.

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 */

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//#define rt_com_irq_off( state )         do{}while(0) //rt_global_save_flags( &state ); rt_global_cli() schreiben und lesen sowieso in IRQ Hm

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//#define rt_com_irq_on(state)            do{}while(0) //rt_global_restore_flags( state ) 

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#define rt_com_irq_off( state )         rt_global_save_flags( &state ); rt_global_cli() 

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#define rt_com_irq_on(state)            rt_global_restore_flags( state ) 

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#define rt_com_request_irq( irq, isr )  rt_request_global_irq( irq, isr ); rt_enable_irq( irq );

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#define rt_com_free_irq( irq )          rt_free_global_irq( irq )

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/* port register offsets */

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#define RT_COM_RXB  0x00

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#define RT_COM_TXB  0x00

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#define RT_COM_IER  0x01

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#define RT_COM_IIR  0x02

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#define RT_COM_FCR  0x02

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#define RT_COM_LCR  0x03

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#define RT_COM_MCR  0x04

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#define RT_COM_LSR  0x05

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#define RT_COM_MSR  0x06

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#define RT_COM_DLL  0x00

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#define RT_COM_DLM  0x01

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/** MCR Modem Control Register masks */

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#define MCR_DTR               0x01 // Data Terminal Ready

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#define MCR_RTS               0x02 // Request To Send 

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#define MCR_OUT1              0x04

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#define MCR_OUT2              0x08

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#define MCR_LOOP              0x10

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#define MCR_AFE               0x20 // AutoFlow Enable

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/** IER Interrupt Enable Register masks */

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#define IER_ERBI              0x01  // Enable Received Data Available Interrupt

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#define IER_ETBEI             0x02  // Enable Transmitter Holding Register

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                                    // Empty Interrupt

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#define IER_ELSI              0x04  // Enable Receiver Line Status Interrupt

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#define IER_EDSSI             0x08  // Enable Modem Status Interrupt

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/** MSR Modem Status Register masks */

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#define MSR_DELTA_CTS         0x01

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#define MSR_DELTA_DSR         0x02

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#define MSR_TERI              0x04

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#define MSR_DELTA_DCD         0x08

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#define MSR_CTS               0x10

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#define MSR_DSR               0x20

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#define MSR_RI                0x40

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#define MSR_DCD               0x80

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/** LSR Line Status Register masks */

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#define LSR_DATA_READY        0x01

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#define LSR_OVERRUN_ERR       0x02

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#define LSR_PARITY_ERR        0x04

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#define LSR_FRAMING_ERR       0x08

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#define LSR_BREAK             0x10

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#define LSR_THRE              0x20	// Transmitter Holding Register

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#define LSR_TEMT              0x40	// Transmitter Empty

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/** FCR FIFO Control Register masks */

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#define FCR_FIFO_ENABLE       0x01

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#define FCR_INPUT_FIFO_RESET  0x02

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#define FCR_OUTPUT_FIFO_RESET 0x04

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/** data buffer

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 *

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 * Used for buffering of input and output data. Two buffers per port

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 * (one for input, one for output). Organized as a FIFO */

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struct rt_buf_struct{

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    unsigned int  head;

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    unsigned int  tail;

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    char buf[ RT_COM_BUF_SIZ ];

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};

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/** Port data

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 *

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 * Internal information structure containing all data for a port. One

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 * structure for every port.

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 *

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 * Contains all current setup parameters and all data currently

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 * buffered by rt_com.

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 *

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 * mode (functioning mode)

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 *   possible values:

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 *   - RT_COM_DSR_ON_TX     - for standard functioning mode (DSR needed on TX)

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 *   - RT_COM_NO_HAND_SHAKE - for comunication without hand shake signals

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 *                            (only RXD-TXD-GND)

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 *   - RT_COM_HW_FLOW       - for hardware flow control (RTS-CTS)

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 *   Of course RT_COM_DSR_ON_TX and RT_COM_NO_HAND_SHAKE cannot be

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 *   sppecified at the same time.

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 *

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 *   NOTE: When you select a mode that uses hand shake signals pay

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 *   attention that no input signals (CTS,DSR,RI,DCD) must be

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 *   floating.

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 *

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 * used (usage flag)

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 *   possible values:

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 *   - RT_COM_PORT_INUSE - port region requested by init_module

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 *   - RT_COM_PORT_FREE  - port region requested by rt_com_set_param

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 *   - RT_COM_PORT_SETUP - port parameters are setup,

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 *                         don't specify at compile time !

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 *

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 * error

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 *   last error detected

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 *

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 * ier (interrupt enable register)

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 *   copy of IER chip register, last value set by rt_com.

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 *

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 * mcr (modem control register)

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 *   copy of the MCR internal register

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 */

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struct rt_com_struct{

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    int baud_base;

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    int port;

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    int irq;

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    void (*isr)(void);

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	int baud;

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	unsigned int wordlength;

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	unsigned int parity;

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	unsigned int stopbits;

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    int mode;

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	int fifotrig;

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    int used;

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	int error;

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    int type;

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    int ier;

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    int mcr;

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    struct rt_buf_struct ibuf;

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    struct rt_buf_struct obuf;

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};

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#endif /* RT_COM_P_H */

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/**

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 * Local Variables:

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 * mode: C

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 * c-file-style: "Stroustrup"

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 * End:

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 */