hal_io.h

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#ifndef CYGONCE_HAL_IO_H
#define CYGONCE_HAL_IO_H

//=============================================================================
//
//      hal_io.h
//
//      HAL device IO register support.
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg, gthomas
// Contributors:        nickg, gthomas
// Date:        1998-09-11
// Purpose:     Define IO register support
// Description: The macros defined here provide the HAL APIs for handling
//              device IO control registers.
//              
// Usage:
//              #include <cyg/hal/hal_io.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/system.h>
#include <cyg/infra/cyg_type.h>

#include <cyg/hal/basetype.h>

//-----------------------------------------------------------------------------
// IO Register address.
// This type is for recording the address of an IO register.

typedef volatile CYG_ADDRWORD HAL_IO_REGISTER;


//-----------------------------------------------------------------------------
// BYTE Register access.
// Individual and vectorized access to 8 bit registers.

#define HAL_READ_UINT8( _register_, _value_ )                           \
CYG_MACRO_START                                                         \
    ((_value_) = *((volatile CYG_BYTE *)((CYG_ADDRWORD)(_register_)))); \
    HAL_IO_BARRIER();                                                   \
CYG_MACRO_END

#define HAL_WRITE_UINT8( _register_, _value_ )                          \
CYG_MACRO_START                                                         \
    (*((volatile CYG_BYTE *)((CYG_ADDRWORD)(_register_))) = (_value_)); \
    HAL_IO_BARRIER();                                                   \
CYG_MACRO_END

#define HAL_READ_UINT8_VECTOR( _register_, _buf_, _count_, _step_ )     \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    volatile CYG_BYTE* _r_ = ((CYG_ADDRWORD)(_register_));              \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        (_buf_)[_i_] = _r_[_j_];                                        \
    CYG_MACRO_END

#define HAL_WRITE_UINT8_VECTOR( _register_, _buf_, _count_, _step_ )    \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    volatile CYG_BYTE* _r_ = ((CYG_ADDRWORD)(_register_));              \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        _r_[_j_] = (_buf_)[_i_];                                        \
    CYG_MACRO_END

//-----------------------------------------------------------------------------
// 16 bit access.
// Individual and vectorized access to 16 bit registers.
    
#define HAL_READ_UINT16( _register_, _value_ )                                  \
CYG_MACRO_START                                                                 \
    ((_value_) = *((volatile CYG_WORD16 *)((CYG_ADDRWORD)(_register_))));       \
    HAL_IO_BARRIER();                                                           \
CYG_MACRO_END

#define HAL_WRITE_UINT16( _register_, _value_ )                                 \
CYG_MACRO_START                                                                 \
    (*((volatile CYG_WORD16 *)((CYG_ADDRWORD)(_register_))) = (_value_));       \
    HAL_IO_BARRIER();                                                           \
CYG_MACRO_END

#define HAL_READ_UINT16_VECTOR( _register_, _buf_, _count_, _step_ )    \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    volatile CYG_WORD16* _r_ = ((CYG_ADDRWORD)(_register_));            \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        (_buf_)[_i_] = _r_[_j_];                                        \
    CYG_MACRO_END

#define HAL_WRITE_UINT16_VECTOR( _register_, _buf_, _count_, _step_ )   \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    volatile CYG_WORD16* _r_ = ((CYG_ADDRWORD)(_register_));            \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        _r_[_j_] = (_buf_)[_i_];                                        \
    CYG_MACRO_END

//-----------------------------------------------------------------------------
// 32 bit access.
// Individual and vectorized access to 32 bit registers.

// Note: same macros for little- and big-endian systems.
    
#define HAL_READ_UINT32( _register_, _value_ )                  \
CYG_MACRO_START                                                 \
   ((_value_) = *((volatile CYG_WORD32 *)(_register_)));        \
    HAL_IO_BARRIER();                                           \
CYG_MACRO_END

#define HAL_WRITE_UINT32( _register_, _value_ )                 \
CYG_MACRO_START                                                 \
    (*((volatile CYG_WORD32 *)(_register_)) = (_value_));       \
    HAL_IO_BARRIER();                                           \
CYG_MACRO_END

#define HAL_READ_UINT32_VECTOR( _register_, _buf_, _count_, _step_ )    \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        (_buf_)[_i_] = ((volatile CYG_WORD32 *)(_register_))[_j_];      \
    CYG_MACRO_END

#define HAL_WRITE_UINT32_VECTOR( _register_, _buf_, _count_, _step_ )   \
    CYG_MACRO_START                                                     \
    cyg_count32 _i_,_j_;                                                \
    for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_))     \
        ((volatile CYG_WORD32 *)(_register_))[_j_] = (_buf_)[_i_];      \
    CYG_MACRO_END

// Enforce a flow "barrier" to prevent optimizing compiler from reordering 
// operations.
#define HAL_IO_BARRIER()                        \
    __asm__ volatile("membar" : : );               


//-----------------------------------------------------------------------------
// Include plf_io.h for platforms that define it.
#ifdef CYGBLD_HAL_PLATFORM_IO_H
#include CYGBLD_HAL_PLATFORM_IO_H
#endif

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_IO_H
// End of hal_io.h