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, 2004 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     

// 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.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 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.         

// -------------------------------------------                              

// ####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 CYGHWR_MEMORY_LAYOUT_H

// Platforms may define this for special handling when accessing the query data.

#ifndef CYGHWR_FLASH_READ_QUERY

#define CYGHWR_FLASH_READ_QUERY(a) (*(a))

#endif

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

int

flash_query(unsigned char *data)  __attribute__ ((section (".2ram.flash_query")));

int

flash_query(unsigned char *data)

{

    volatile flash_t *ROM, *p, dummy;

    int i, cnt;

    // 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--) ;

    p = ROM;

    while ( i--) {

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

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

        *data++ = (unsigned char) CYGHWR_FLASH_READ_QUERY(p++);

#ifndef CYGOPT_FLASH_IS_BOOTBLOCK

# if  8 == CYGNUM_FLASH_WIDTH

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

        // at even addresses

        ++p;

# endif

#endif

    }

    // Reset the flash to array mode. The dummy read is required on MIPS

    // platforms (don't know about others) to force the write out. Should

    // there be direct HAL support for this kind of operation?

    ROM[0] = FLASH_Reset;

    dummy = ROM[0];

    return 0;

}