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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

// Contributors: gthomas, msalter

// Date:         2000-07-14

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

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

#include "flash.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 unsigned char *addr, unsigned char *data, int len)

{

    volatile unsigned char *ROM;

    volatile unsigned char *BA;

    unsigned short stat;

    int timeout = 5000000;

    int i, wc, cache_on;

    HAL_DCACHE_IS_ENABLED(cache_on);

    if (cache_on) {

        HAL_DCACHE_SYNC();

        HAL_DCACHE_DISABLE();

    }

    ROM = FLASH_P2V((unsigned long)addr & 0xFF800000);

    BA  = FLASH_P2V((unsigned long)addr & 0xFFFE0000);

    // Clear any error conditions

    ROM[0] = FLASH_Clear_Status;

    wc = 32;

    while (len >= wc) {

        len -= wc;

        // The IQ803010 has a hole in flash which must be avoided.

        if (((unsigned char *)0x1000) <= addr && addr < ((unsigned char *)0x2000)) {

            addr += wc;

            data += wc;

            continue;

        }

        *BA = FLASH_Write_Buffer;

        timeout = 5000000;

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

            if (--timeout == 0) {

                stat |= 0x0100;

                goto bad;

            }

            *BA = FLASH_Write_Buffer;

        }

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

        if (FLASH_P2V(addr) != addr) {

            volatile unsigned char *tmp;

            tmp = FLASH_P2V(addr);

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

                *tmp++ = *data++;

            addr += wc;

        } else {

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

                *addr++ = *data++;

        }

        *BA = FLASH_Confirm;

        stat = *BA;

    }

    ROM[0] = FLASH_Read_Status;

    timeout = 5000000;

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

        if (--timeout == 0) {

            stat |= 0x0200;

            goto bad;

        }

    }

    while (len > 0) {

        ROM[0] = FLASH_Program;

        *FLASH_P2V(addr) = *data++;

        addr++;

        timeout = 5000000;

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

            if (--timeout == 0) {

                stat |= 0x0300;

                goto bad;

            }

        }

        --len;

    }

    // Restore ROM to "normal" mode

 bad:

    ROM[0] = FLASH_Reset;

    if (cache_on) {

        HAL_DCACHE_ENABLE();

    }

    return stat;

}