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

//

//      flash_program_buf.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):    gthomas, hmt

// Contributors: gthomas

// Date:         2001-02-14

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

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

#include "strata.h"

#include <pkgconf/hal.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_cache.h>

//

// CAUTION!  This code must be copied to RAM before execution.  Therefore,

// it must not contain any code which might be position dependent!

//

int

flash_program_buf(volatile flash_t *addr, flash_t *data, int len,

                  unsigned long block_mask, int buffer_size)

{

    volatile flash_t *ROM;

    volatile flash_t *BA;

    flash_t stat = 0;

    int timeout = 50000;

    int cache_on;

#ifdef FLASH_Write_Buffer

    int i, wc;

#endif

    HAL_DCACHE_IS_ENABLED(cache_on);

    if (cache_on) {

        HAL_DCACHE_SYNC();

        HAL_DCACHE_DISABLE();

    }

    // Get base address and map addresses to virtual addresses

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

    BA = FLASH_P2V( block_mask & (unsigned int)addr );

    addr = FLASH_P2V(addr);

    // Clear any error conditions

    ROM[0] = FLASH_Clear_Status;

#ifdef FLASH_Write_Buffer

    // Write any big chunks first

    while (len >= buffer_size) {

        wc = buffer_size;

        if (wc > len) wc = len;

        len -= wc;

        // convert 'wc' in bytes to 'wc' in 'flash_t' 

        wc = wc / sizeof(flash_t);  // Word count

        *BA = FLASH_Write_Buffer;

        timeout = 5000000;

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

            if (--timeout == 0) {

                goto bad;

            }

            *BA = FLASH_Write_Buffer;

        }

        *BA = FLASHWORD(wc-1);  // Count is 0..N-1

        for (i = 0;  i < wc;  i++) {

#ifdef CYGHWR_FLASH_WRITE_ELEM

            CYGHWR_FLASH_WRITE_ELEM(addr+i, data+i);

#else

            *(addr+i) = *(data+i);

#endif

        }

        *BA = FLASH_Confirm;

        ROM[0] = FLASH_Read_Status;

        timeout = 5000000;

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

            if (--timeout == 0) {

                goto bad;

            }

        }

        // Jump out if there was an error

        if (stat & FLASH_ErrorMask) {

            goto bad;

        }

        // And verify the data - also increments the pointers.

        *BA = FLASH_Reset;

        for (i = 0;  i < wc;  i++) {

            if ( *addr++ != *data++ ) {

                stat = FLASH_ErrorNotVerified;

                goto bad;

            }

        }

    }

#endif

    while (len > 0) {

        ROM[0] = FLASH_Program;

#ifdef CYGHWR_FLASH_WRITE_ELEM

        CYGHWR_FLASH_WRITE_ELEM(addr, data);

#else

        *addr = *data;

#endif

        timeout = 5000000;

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

            if (--timeout == 0) {

                goto bad;

            }

        }

        if (stat & FLASH_ErrorMask) {

            break;

        }

        ROM[0] = FLASH_Reset;

        if (*addr++ != *data++) {

            stat = FLASH_ErrorNotVerified;

            break;

        }

        len -= sizeof( flash_t );

    }

    // Restore ROM to "normal" mode

 bad:

    ROM[0] = FLASH_Reset;

    if (cache_on) {

        HAL_DCACHE_ENABLE();

    }

    return stat;

}