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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     

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// version.                                                                 

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// 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.                                                        

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// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

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//

// 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.                                               

//

// This exception does not invalidate any other reasons why a work based    

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

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// ####ECOSGPLCOPYRIGHTEND####                                              

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

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

//

// Author(s):    gthomas

// Contributors: gthomas, msalter

// Date:         2000-12-07

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

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

#include "flash.h"

#include <pkgconf/hal.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_cache.h>

int flash_erase_block(volatile unsigned long *block)

        __attribute__ ((section (".2ram.flash_erase_block")));

int flash_erase_block(volatile unsigned long *block)

{

    volatile unsigned long *ROM;

    unsigned long stat;

    int timeout = 50000;

    int len;

    FLASH_WRITE_ENABLE();

    block = (volatile unsigned long *)CYGARC_UNCACHED_ADDRESS((unsigned long)block);

    ROM = (volatile unsigned long *)((unsigned long)block & FLASH_BASE_MASK);

    // Clear any error conditions

    ROM[0] = FLASH_Clear_Status;

    // Erase block

    ROM[0] = FLASH_Block_Erase;

    *block = FLASH_Confirm;

    timeout = 5000000;

    while(((stat = ROM[0]) & FLASH_Status_Ready) != FLASH_Status_Ready) {

        if (--timeout == 0) break;

    }

    // Restore ROM to "normal" mode

    ROM[0] = FLASH_Reset;

    // If an error was reported, see if the block erased anyway

    if (stat & 0x007E007E) {

        len = FLASH_BLOCK_SIZE;

        while (len > 0) {

            if (*block++ != 0xFFFFFFFF) break;

            len -= sizeof(*block);

        }

        if (len == 0) stat = 0;

    }

    FLASH_WRITE_DISABLE();

    return stat;

}