Subversion Repositories openrisc

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

//

//      flash_query.c

//

//      Flash programming - query device

//

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

//####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>

#include CYGHWR_MEMORY_LAYOUT_H

//

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

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

//

#define CNT 20*1000*10  // Approx 20ms

int

flash_query(unsigned char *data)

{

    volatile flash_t *ROM;

    int i, cnt;

    int cache_on;

    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 );

#ifdef CYGOPT_FLASH_IS_BOOTBLOCK

    // BootBlock flash does not support full Read_Query - we have do a

    // table oriented thing above, after getting just two bytes of results:

    ROM[0] = FLASH_Read_ID;

    i = 2;

#else

    // StrataFlash supports the full Read_Query op:

    ROM[0] = FLASH_Read_Query;

    i = sizeof(struct FLASH_query);

#endif // Not CYGOPT_FLASH_IS_BOOTBLOCK

    for (cnt = CNT;  cnt > 0;  cnt--) ;

    for ( /* i */;  i > 0;  i-- ) {

        // It is very deliberate that data is chars NOT flash_t:

        // The info comes out in bytes regardless of device.

        *data++ = (unsigned char) (*ROM++);

#ifndef CYGOPT_FLASH_IS_BOOTBLOCK

# if  8 == CYGNUM_FLASH_WIDTH

        // strata flash with 'byte-enable' contains the configuration data

        // at even addresses

        ++ROM;

# endif

#endif

    }

    ROM[0] = FLASH_Reset;

    if (cache_on) {

        HAL_DCACHE_ENABLE();

    }

    return 0;

}