flash_dev.h

基于ecos的redboot

#ifndef CYGONCE_IO_FLASH_FLASH_DEV_H
#define CYGONCE_IO_FLASH_FLASH_DEV_H
//==========================================================================
//
//      flash_dev.h
//
//      Common flash device driver definitions
//
//==========================================================================
//####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, 2001 Red Hat, Inc.
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: hmt, jskov
// Date:         2001-02-22
// Purpose:      Define common flash device driver definitions
// Description:  The flash_data_t type is used for accessing
//               devices at the correct width.
//               The FLASHWORD macro must be used to create constants
//               of suitable width.
//               The FLASH_P2V macro can be used to fix up non-linear
//               mappings of flash blocks (defaults to a linear 
//               implementation).
//              
//####DESCRIPTIONEND####
//
//==========================================================================

#ifdef _FLASH_PRIVATE_

// ------------------------------------------------------------------------
//
// No mapping on this target - but these casts would be needed if some
// manipulation did occur.  An example of this might be:
// // First 4K page of flash at physical address zero is
// // virtually mapped at address 0xa0000000.
// #define FLASH_P2V(x) ((volatile flash_t *)(((unsigned)(x) < 0x1000) ?
//                            ((unsigned)(x) | 0xa0000000) :
//                            (unsigned)(x)))

#ifndef FLASH_P2V
#define FLASH_P2V( _a_ ) ((volatile flash_t *)((CYG_ADDRWORD)(_a_)))
#endif

// ------------------------------------------------------------------------
//
// This generic code is intended to deal with all shapes and orientations
// of Intel StrataFlash.  Trademarks &c belong to their respective owners.
//
// It therefore needs some trickery to define the constants and accessor
// types that we use to interact with the device or devices.
//
// The assumptions are that
//  o Parallel devices, we write to, with the "opcode" replicated per
//    device
//  o The "opcode" and status returns exist only in the low byte of the
//    device's interface regardless of its width.
//  o Hence opcodes and status are only one byte.
// An exception is the test for succesfully erased data.
//
// ------------------------------------------------------------------------

#if 8 == CYGNUM_FLASH_WIDTH

# if 1 == CYGNUM_FLASH_INTERLEAVE
#  define FLASHWORD( k ) ((flash_data_t)(k)) // To narrow a 16-bit constant
typedef cyg_uint8 flash_data_t;
# elif 2 == CYGNUM_FLASH_INTERLEAVE
// 2 devices to make 16-bit
#  define FLASHWORD( k ) ((k)+((k)<<8))
typedef cyg_uint16 flash_data_t;
# elif 4 == CYGNUM_FLASH_INTERLEAVE
// 4 devices to make 32-bit
#  define FLASHWORD( k ) ((k)+((k)<<8)+((k)<<16)+((k)<<24))
typedef cyg_uint32 flash_data_t;
# elif 8 == CYGNUM_FLASH_INTERLEAVE
// 8 devices to make 64-bit - intermediate requires explicit widening
#  define FLASHWORD32( k ) ((flash_data_t)((k)+((k)<<8)+((k)<<16)+((k)<<24)))
#  define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
typedef cyg_uint64 flash_data_t;
# else
#  error How many 8-bit flash devices?
# endif

#elif 16 == CYGNUM_FLASH_WIDTH

# if 1 == CYGNUM_FLASH_INTERLEAVE
#  define FLASHWORD( k ) (k)
typedef cyg_uint16 flash_data_t;
# elif 2 == CYGNUM_FLASH_INTERLEAVE
// 2 devices to make 32-bit
#  define FLASHWORD( k ) ((k)+((k)<<16))
typedef cyg_uint32 flash_data_t;
# elif 2 == CYGNUM_FLASH_INTERLEAVE
// 4 devices to make 64-bit - intermediate requires explicit widening
#  define FLASHWORD32( k ) ((flash_data_t)((k)+((k)<<16)))
#  define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
typedef cyg_uint64 flash_data_t;
# else
#  error How many 16-bit flash devices?
# endif

#elif 32 == CYGNUM_FLASH_WIDTH

# if 1 == CYGNUM_FLASH_INTERLEAVE
#  define FLASHWORD( k ) (k)
typedef cyg_uint32 flash_data_t;
# elif 2 == CYGNUM_FLASH_INTERLEAVE
// 2 devices to make 64-bit - intermediate requires explicit widening
#  define FLASHWORD32( k ) ((flash_data_t)(k))
#  define FLASHWORD( k ) (FLASHWORD32( k ) + (FLASHWORD32( k ) << 32));
typedef cyg_uint64 flash_data_t;
# else
#  error How many 32-bit flash devices?
# endif

#else
# error What flash width?
#endif

// Data (not) that we read back:
#if 0 == CYGNUM_FLASH_BLANK
# define FLASH_BlankValue ((flash_data_t)0)
#elif 1 == CYGNUM_FLASH_BLANK
# define FLASH_BlankValue ((flash_data_t)(-1ll))
#else
# error What blank value?
#endif

#endif // _FLASH_PRIVATE_

#endif // CYGONCE_IO_FLASH_FLASH_DEV_H
//----------------------------------------------------------------------------
// end of flash_dev.h