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//==========================================================================

//

//      flash_erase_block.c

//

//      Flash programming

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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   

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// General Public License v2.                                               

//

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// on this file might be covered by the GNU General Public License.         

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// ####ECOSGPLCOPYRIGHTEND####                                              

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    andrew.lunn@ascom.ch

// Contributors: andrew.lunn

// Date:         2001-10-30

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

//==========================================================================

#include "synth.h"

#include <cyg/hal/hal_io.h>

#include <pkgconf/devs_flash_synth.h>

#include <cyg/infra/cyg_ass.h>

#include <cyg/io/flash.h>

#include <cyg/io/flash_dev.h>

#include <string.h> // memset

#ifndef MIN

#define MIN(x,y) ((x)<(y) ? (x) : (y))

#endif

int flash_erase_block(volatile flash_t *block, unsigned int block_size)

{

    unsigned int offset = (unsigned int) block;

    size_t remaining;

    int write_size;

    // This helps speed up the erasing

    static cyg_uint8 empty[4096];

    static cyg_bool empty_inited;

    offset -= (unsigned int) cyg_dev_flash_synth_base;

    cyg_hal_sys_lseek(cyg_dev_flash_synth_flashfd, offset,

                      CYG_HAL_SYS_SEEK_SET);

    if (!empty_inited) {

        memset(empty, 0xff, sizeof(empty));

        empty_inited = true;

    }

    remaining = flash_info.block_size;

    while (remaining) {

      write_size = MIN(remaining, sizeof(empty));

      cyg_hal_sys_write(cyg_dev_flash_synth_flashfd, empty, write_size);

      remaining -= write_size;

    }

    return FLASH_ERR_OK;

}