Subversion Repositories openrisc_2011-10-31

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

//

//      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 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):    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 <string.h> // memset

/* This helps speed up the erase. */

static char empty[4096];

static cyg_bool empty_inited = false;

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

{

    int i;

    int offset = (int)block;

    offset -= (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;

    }

    CYG_ASSERT(sizeof(empty) < block_size,

               "Eckk! Can't work with such small blocks");

    CYG_ASSERT((block_size % sizeof(empty)) == 0,

               "Eckk! Can't work with that odd size block");

    for (i=0; (i * sizeof(empty)) < block_size; i++) {

        cyg_hal_sys_write(cyg_dev_flash_synth_flashfd, empty, sizeof(empty));

    }

    return FLASH_ERR_OK;

}