source: soft/giet_vm/giet_drivers/tty_driver.h

///////////////////////////////////////////////////////////////////////////////////
// File     : tty_driver.h
// Date     : 01/11/2013
// Author   : alain greiner
// Copyright (c) UPMC-LIP6
///////////////////////////////////////////////////////////////////////////////////
// The tty_driver.c and tty_drivers.h files are part ot the GIET-VM kernel.
// This driver supports the SocLib vci_multi_tty component.
//
// The total number of TTY terminals must be defined by the configuration 
// parameter NB_TTY_CHANNELS in the hard_config.h file.
//
// The "system" terminal is TTY[0].
// The "user" TTYs are allocated to applications requesting it.
//
// The SEG_TTY_BASE address must be defined in the hard_config.h file.
//
// All physical accesses to device registers are done by the two
// _tty_get_register(), _tty_set_register() low-level functions,
// that are handling virtual / physical addressing.
///////////////////////////////////////////////////////////////////////////////////

#ifndef _GIET_TTY_DRIVERS_H_
#define _GIET_TTY_DRIVERS_H_

#include "hard_config.h"
#include "kernel_locks.h"


///////////////////////////////////////////////////////////////////////////////////
//                     registers offsets
///////////////////////////////////////////////////////////////////////////////////

enum TTY_registers 
{
    TTY_WRITE   = 0,
    TTY_STATUS  = 1,
    TTY_READ    = 2,
    TTY_CONFIG  = 3,
    /**/
    TTY_SPAN    = 4,
};


//////////////////////////////////////////////////////////////////////////////////
//                    struct tty_fifo_t
//////////////////////////////////////////////////////////////////////////////////

#define TTY_FIFO_DEPTH  16

typedef struct tty_fifo_s     // 32 bytes
{
    char          data[TTY_FIFO_DEPTH];   // one char per slot
    unsigned int  trdid;                  // owner thread trdid
    unsigned int  ptr;                    // next free slot index
    unsigned int  ptw;                    // next full slot index
    unsigned int  sts;                    // number of full slots
} tty_fifo_t;
 
//////////////////////////////////////////////////////////////////////////////////
//                    access functions
//////////////////////////////////////////////////////////////////////////////////

extern unsigned int _tty_get_register( unsigned int channel,
                                       unsigned int index );

extern void _tty_set_register( unsigned int channel,
                               unsigned int index,
                               unsigned int value );

extern void _tty_init( unsigned int channel );

//////////////////////////////////////////////////////////////////////////////////
//                 Interrupt Service Routine 
///////////////////////////////////////////////////////////////////////////////////

extern void _tty_rx_isr( unsigned int irq_type,
                         unsigned int irq_id,
                         unsigned int channel );

extern void _tty_tx_isr( unsigned int irq_type,
                         unsigned int irq_id,
                         unsigned int channel );


#endif

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