207 lines
6.1 KiB
C
207 lines
6.1 KiB
C
/**
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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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*/
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