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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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// 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.                                               

//

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

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// ####ECOSGPLCOPYRIGHTEND####                                              

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

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

//

// Author(s):    gthomas, hmt

// Contributors: gthomas

// Date:         2001-02-14

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

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

#include "strata.h"

#include <pkgconf/hal.h>

#include <cyg/hal/hal_arch.h>

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

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

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

{

    volatile flash_t *ROM;

    flash_t stat = 0;

    int timeout = 50000;

    int len, block_len, erase_block_size;

    volatile flash_t *eb;

    // Get base address and map addresses to virtual addresses

    ROM = FLASH_P2V(CYGNUM_FLASH_BASE_MASK & (unsigned int)block);

    eb = block = FLASH_P2V(block);

    block_len = block_size;

#ifdef CYGOPT_FLASH_IS_BOOTBLOCK

#define BLOCKSIZE (0x10000*CYGNUM_FLASH_DEVICES)

#define ERASE_BLOCKSIZE (0x2000*CYGNUM_FLASH_DEVICES)

    if ((eb - ROM) < BLOCKSIZE/(sizeof eb[0])) {

        erase_block_size = ERASE_BLOCKSIZE;

    } else {

        erase_block_size = block_size;

    }

#else

    erase_block_size = block_size;

#endif

    // Clear any error conditions

    ROM[0] = FLASH_Clear_Status;

    // Erase block

    while (block_len > 0) {

        eb[0] = FLASH_Block_Erase;

        eb[0] = FLASH_Confirm;

        timeout = 5000000;

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

            if (--timeout == 0) break;

        }

        block_len -= erase_block_size;

        eb = FLASH_P2V((unsigned int)eb + erase_block_size);

    }

    // Restore ROM to "normal" mode

    ROM[0] = FLASH_Reset;

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

    if (stat & FLASH_ErrorMask ) {

        len = block_size;

        while (len > 0) {

            if (*block++ != FLASH_BlankValue ) break;

            len -= sizeof(*block);

        }

        if (len == 0) stat = 0;

    }

    return stat;

}