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#ifndef CYGONCE_HAL_IO_H
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#define CYGONCE_HAL_IO_H
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//=============================================================================
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//
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// hal_io.h
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//
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// HAL device IO register support.
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//
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//=============================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): nickg, gthomas
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// Contributors: nickg, gthomas
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// Date: 1998-09-11
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// Purpose: Define IO register support
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// Description: The macros defined here provide the HAL APIs for handling
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// device IO control registers.
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//
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// Usage:
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// #include <cyg/hal/hal_io.h>
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// ...
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//
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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#include <pkgconf/system.h>
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#include <cyg/infra/cyg_type.h>
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#include <cyg/hal/basetype.h>
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//-----------------------------------------------------------------------------
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// IO Register address.
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// This type is for recording the address of an IO register.
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typedef volatile CYG_ADDRWORD HAL_IO_REGISTER;
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//-----------------------------------------------------------------------------
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// BYTE Register access.
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// Individual and vectorized access to 8 bit registers.
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#define HAL_READ_UINT8( _register_, _value_ ) \
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CYG_MACRO_START \
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((_value_) = *((volatile CYG_BYTE *)((CYG_ADDRWORD)(_register_)))); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_WRITE_UINT8( _register_, _value_ ) \
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CYG_MACRO_START \
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(*((volatile CYG_BYTE *)((CYG_ADDRWORD)(_register_))) = (_value_)); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_READ_UINT8_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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volatile CYG_BYTE* _r_ = ((CYG_ADDRWORD)(_register_)); \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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(_buf_)[_i_] = _r_[_j_]; \
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CYG_MACRO_END
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#define HAL_WRITE_UINT8_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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volatile CYG_BYTE* _r_ = ((CYG_ADDRWORD)(_register_)); \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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_r_[_j_] = (_buf_)[_i_]; \
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CYG_MACRO_END
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//-----------------------------------------------------------------------------
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// 16 bit access.
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// Individual and vectorized access to 16 bit registers.
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#define HAL_READ_UINT16( _register_, _value_ ) \
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CYG_MACRO_START \
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((_value_) = *((volatile CYG_WORD16 *)((CYG_ADDRWORD)(_register_)))); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_WRITE_UINT16( _register_, _value_ ) \
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CYG_MACRO_START \
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(*((volatile CYG_WORD16 *)((CYG_ADDRWORD)(_register_))) = (_value_)); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_READ_UINT16_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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volatile CYG_WORD16* _r_ = ((CYG_ADDRWORD)(_register_)); \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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(_buf_)[_i_] = _r_[_j_]; \
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CYG_MACRO_END
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#define HAL_WRITE_UINT16_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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volatile CYG_WORD16* _r_ = ((CYG_ADDRWORD)(_register_)); \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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_r_[_j_] = (_buf_)[_i_]; \
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CYG_MACRO_END
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//-----------------------------------------------------------------------------
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// 32 bit access.
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// Individual and vectorized access to 32 bit registers.
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// Note: same macros for little- and big-endian systems.
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#define HAL_READ_UINT32( _register_, _value_ ) \
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CYG_MACRO_START \
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((_value_) = *((volatile CYG_WORD32 *)(_register_))); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_WRITE_UINT32( _register_, _value_ ) \
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CYG_MACRO_START \
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(*((volatile CYG_WORD32 *)(_register_)) = (_value_)); \
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HAL_IO_BARRIER(); \
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CYG_MACRO_END
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#define HAL_READ_UINT32_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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(_buf_)[_i_] = ((volatile CYG_WORD32 *)(_register_))[_j_]; \
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CYG_MACRO_END
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#define HAL_WRITE_UINT32_VECTOR( _register_, _buf_, _count_, _step_ ) \
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CYG_MACRO_START \
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cyg_count32 _i_,_j_; \
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for( _i_ = 0, _j_ = 0; _i_ < (_count_); _i_++, _j_ += (_step_)) \
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((volatile CYG_WORD32 *)(_register_))[_j_] = (_buf_)[_i_]; \
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CYG_MACRO_END
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// Enforce a flow "barrier" to prevent optimizing compiler from reordering
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// operations.
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#define HAL_IO_BARRIER() \
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__asm__ volatile("membar" : : );
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//-----------------------------------------------------------------------------
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// Include plf_io.h for platforms that define it.
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#ifdef CYGBLD_HAL_PLATFORM_IO_H
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#include CYGBLD_HAL_PLATFORM_IO_H
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#endif
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//-----------------------------------------------------------------------------
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#endif // ifndef CYGONCE_HAL_IO_H
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// End of hal_io.h
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