termiostty.c

Intel XScale PXA255 引导Linux的Redboot 版bootloader源代码！

//==========================================================================
//
//      termiostty.c
//
//      POSIX Termios compatible TTY I/O driver
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    jlarmour
// Contributors: gthomas
// Date:         2000-07-22
// Purpose:      Device driver for termios emulation tty I/O, layered on
//               top of serial I/O
// Description:  TODO: Add OPOST support for 80x25 (configurable) windows
//               TODO: Support _POSIX_VDISABLE
//
//####DESCRIPTIONEND####
//
//==========================================================================

// CONFIGURATION

#include <pkgconf/io_serial.h>

#ifdef CYGPKG_IO_SERIAL_TERMIOS

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common types 
#include <cyg/infra/cyg_ass.h>     // Assertion support
#include <cyg/infra/cyg_trac.h>    // Tracing support
#include <cyg/io/io.h>
#include <cyg/io/devtab.h>
#include <cyg/io/serialio.h>       // public serial API
#include <termios.h>               // Termios header
#include <cyg/hal/drv_api.h>
#include <stdlib.h>                // malloc
#include <string.h>
#ifdef CYGSEM_IO_SERIAL_TERMIOS_USE_SIGNALS
# include <signal.h>
#endif

//==========================================================================
// FUNCTION PROTOTYPES

static bool
termios_init(struct cyg_devtab_entry *tab);

static Cyg_ErrNo
termios_lookup(struct cyg_devtab_entry **tab, 
               struct cyg_devtab_entry *sub_tab,
               const char *name);
static Cyg_ErrNo
termios_write(cyg_io_handle_t handle, const void *buf, cyg_uint32 *len);
static Cyg_ErrNo
termios_read(cyg_io_handle_t handle, void *buf, cyg_uint32 *len);
static Cyg_ErrNo
termios_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info);
static Cyg_ErrNo 
termios_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *buf,
                   cyg_uint32 *len);
static Cyg_ErrNo 
termios_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *buf,
                   cyg_uint32 *len);

//==========================================================================
// TYPE DEFINITIONS

struct termios_private_info {
    struct termios  termios;
    cyg_io_handle_t dev_handle;
    cyg_drv_mutex_t lock;
    cyg_bool        init;
    cyg_uint8      *errbuf;
    cyg_uint8      *errbufpos;
    cyg_uint32      errbufsize;
};

typedef struct {
    struct termios *termios_p;
    int optact;
} setattr_struct;


//==========================================================================
// STATIC OBJECTS

static DEVIO_TABLE(termios_devio,
                   termios_write,
                   termios_read,
                   termios_select,
                   termios_get_config,
                   termios_set_config);

#ifdef CYGPKG_IO_SERIAL_TERMIOS_TERMIOS0
static struct termios_private_info termios_private_info0;
DEVTAB_ENTRY(termios_io0, 
             "/dev/termios0",
             CYGDAT_IO_SERIAL_TERMIOS_TERMIOS0_DEV,
             &termios_devio,
             termios_init, 
             termios_lookup,
             &termios_private_info0);
#endif

#ifdef CYGPKG_IO_SERIAL_TERMIOS_TERMIOS1
static struct termios_private_info termios_private_info1;
DEVTAB_ENTRY(termios_io1, 
             "/dev/termios1", 
             CYGDAT_IO_SERIAL_TERMIOS_TERMIOS1_DEV,
             &termios_devio, 
             termios_init, 
             termios_lookup,
             &termios_private_info1);
#endif

#ifdef CYGPKG_IO_SERIAL_TERMIOS_TERMIOS2
static struct termios_private_info termios_private_info2;
DEVTAB_ENTRY(termios_io2, 
             "/dev/termios2", 
             CYGDAT_IO_SERIAL_TERMIOS_TERMIOS2_DEV,
             &termios_devio, 
             termios_init, 
             termios_lookup,
             &termios_private_info2);
#endif

static const cc_t c_cc_init[ NCCS ] = { 
    0x04,     /* EOF == ^D */
    0,        /* EOL */
    0x08,     /* ERASE = BS ; NB DEL=0x7f */
    0x03,     /* INTR = ^C */
    0x15,     /* KILL = ^U */
    0,        /* MIN = 0 */
    0x1c,     /* QUIT = ^\ */
    0x1a,     /* SUSP = ^Z ; NB ignored in this impl - no job control */
    0,        /* TIME = 0 */
#ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
    CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR,
    CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR,
#else
    17,
    19,
#endif
};

// map eCos bitrates to POSIX bitrates.
static speed_t ecosbaud2posixbaud[] = {
    0, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B2400, B3600,
    B4800, B7200, B9600, B14400, B19200, B38400, B57600, B115200, B230400 };

// map POSIX bitrates to eCos bitrates.
static cyg_serial_baud_rate_t posixbaud2ecosbaud[] = {
    0, CYGNUM_SERIAL_BAUD_50, CYGNUM_SERIAL_BAUD_75, CYGNUM_SERIAL_BAUD_110,
    CYGNUM_SERIAL_BAUD_134_5, CYGNUM_SERIAL_BAUD_150, CYGNUM_SERIAL_BAUD_200,
    CYGNUM_SERIAL_BAUD_300, CYGNUM_SERIAL_BAUD_600, CYGNUM_SERIAL_BAUD_1200,
    CYGNUM_SERIAL_BAUD_1800, CYGNUM_SERIAL_BAUD_2400, CYGNUM_SERIAL_BAUD_3600,
    CYGNUM_SERIAL_BAUD_4800, CYGNUM_SERIAL_BAUD_7200, CYGNUM_SERIAL_BAUD_9600,
    CYGNUM_SERIAL_BAUD_14400, CYGNUM_SERIAL_BAUD_19200,
    CYGNUM_SERIAL_BAUD_38400, CYGNUM_SERIAL_BAUD_57600,
    CYGNUM_SERIAL_BAUD_115200, CYGNUM_SERIAL_BAUD_230400 };


//==========================================================================
// FUNCTIONS

static __inline__ speed_t
map_ecosbaud_to_posixbaud( cyg_serial_baud_rate_t ebaud )
{
    if ( ebaud > (sizeof(ecosbaud2posixbaud) / sizeof(speed_t)) )
        return 0;
    return ecosbaud2posixbaud[ ebaud ];
}

static __inline__ cyg_serial_baud_rate_t
map_posixbaud_to_ecosbaud( speed_t pbaud )
{
    if ( pbaud > (sizeof(posixbaud2ecosbaud)/sizeof(cyg_serial_baud_rate_t)) )
        return 0;
    return posixbaud2ecosbaud[ pbaud ];
}

//==========================================================================
// real_termios_init is used to initialize the termios structure. This is
// called at lookup time, and not from termios_init() because it needs
// to query the serial device which may not be set up yet at that point
// in termios_init()

#ifdef CYGSEM_IO_SERIAL_TERMIOS_USE_SIGNALS
# define C_IFLAG_INIT (ICRNL|IGNBRK|BRKINT)
#else
# define C_IFLAG_INIT (ICRNL|IGNBRK)
#endif
#define C_OFLAG_INIT (ONLCR)
#define C_CFLAG_INIT (CREAD)
#define C_LFLAG_INIT (ECHO|ECHOE|ECHOK|ICANON)

static Cyg_ErrNo
real_termios_init( struct termios_private_info *priv )
{
    Cyg_ErrNo res;
    struct termios *t;
    cyg_serial_info_t dev_conf;
    cyg_serial_buf_info_t dev_buf_conf;
    cyg_uint32 len = sizeof( dev_conf );

    CYG_REPORT_FUNCTYPE("returning %d");
    CYG_REPORT_FUNCARG1XV( priv );
    CYG_CHECK_DATA_PTRC( priv );

    t = &priv->termios;

    // Get info from driver
    res = cyg_io_get_config( priv->dev_handle, CYG_IO_GET_CONFIG_SERIAL_INFO,
                             &dev_conf, &len );
    if ( ENOERR == res ) {
        len = sizeof( dev_buf_conf );
        res = cyg_io_get_config( priv->dev_handle,
                                 CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO,
                                 &dev_buf_conf, &len );
    }

    priv->errbuf = (cyg_uint8 *)malloc( dev_buf_conf.rx_bufsize );
    if ( NULL == priv->errbuf )
        res = ENOMEM;   // FIXME: Are we allowed to do this?
    priv->errbufpos = priv->errbuf;
    priv->errbufsize = dev_buf_conf.rx_bufsize;

    if ( ENOERR != res ) {
        CYG_REPORT_RETVAL( res );
        return res;
    }
    
    // we only support symmetric baud rates
    t->c_ispeed = t->c_ospeed = map_ecosbaud_to_posixbaud( dev_conf.baud );
    t->c_iflag = C_IFLAG_INIT;
    t->c_oflag = C_OFLAG_INIT;
    t->c_cflag = C_CFLAG_INIT;
    t->c_lflag = C_LFLAG_INIT;
    memcpy( t->c_cc, c_cc_init, sizeof( t->c_cc ) );
    
    switch ( dev_conf.parity ) {
    case CYGNUM_SERIAL_PARITY_NONE:
        t->c_iflag |= IGNPAR;
        break;
    case CYGNUM_SERIAL_PARITY_ODD:
        t->c_cflag |= PARODD;
        // DROPTHROUGH
    case CYGNUM_SERIAL_PARITY_EVEN:
        t->c_iflag |= PARENB;
        break;
    default:
        CYG_FAIL( "Unsupported default parity" );
        break;
    }

    switch( dev_conf.word_length ) {
    case CYGNUM_SERIAL_WORD_LENGTH_5:
        t->c_cflag |= CS5;
        break;        
    case CYGNUM_SERIAL_WORD_LENGTH_6:
        t->c_cflag |= CS6;
        break;
    case CYGNUM_SERIAL_WORD_LENGTH_7:
        t->c_cflag |= CS7;
        break;
    case CYGNUM_SERIAL_WORD_LENGTH_8:
        t->c_cflag |= CS8;
        break;
    default:
        CYG_FAIL( "Unsupported word length" );
        break;
    }