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

//

//      moab_nand_flash.c

//

//      Flash programming for Toshiba NAND FLASH device on MOAB board

//

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

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

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.

//

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// for more details.                                                        

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// 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      

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// General Public License v2.                                               

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

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

//

// Author(s):    Gary Thomas <gary@mlbassoc.com>

// Contributors: 

// Date:         2003-09-02

// Purpose:      

// Description:  

//              

//####DESCRIPTIONEND####

//

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

#include <cyg/infra/cyg_type.h>

#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS

#include <cyg/hal/ppc_regs.h>           // Platform registers

#include <cyg/hal/hal_io.h>             // I/O macros

#include <cyg/hal/hal_if.h>             // Virtual vector interfaces

// There's a single TC58256 or TC58DVG02 on the MOAB board. 

#define CYGHWR_DEVS_FLASH_TOSHIBA_TC58256

#define CYGHWR_DEVS_FLASH_TOSHIBA_TC58DVG02

#define CYGNUM_FLASH_BLANK      (1)

#define CYGNUM_FLASH_INTERLEAVE (1)

#define CYGNUM_FLASH_WIDTH      (8)

#define CYGNUM_FLASH_SERIES     (1)

#define CYGNUM_FLASH_BASE       (_MOAB_NAND)

#define CYGHWR_FLASH_TC58XXX_CE   moab_CE 

#define CYGHWR_FLASH_TC58XXX_CLE  moab_CLE 

#define CYGHWR_FLASH_TC58XXX_ALE  moab_ALE

#define CYGHWR_FLASH_TC58XXX_RDY  moab_RDY

//

// Select the NAND device - this will be held until the

// entire command/data sequence has completed (which is

// necessary for read sequential)

//

static void __inline__

moab_CE(int state)

{

    cyg_uint32 gpio_or;

    HAL_READ_UINT32(GPIO_OR, gpio_or);

    if (state) {

        // Assert CE

        gpio_or &= ~_MOAB_CE;

    } else {

        // De-assert CE

        gpio_or |= _MOAB_CE;

    }

    HAL_WRITE_UINT32(GPIO_OR, gpio_or);

}

//

// Prepare to send a command byte to the NAND interface

//

static void __inline__

moab_CLE(int state)

{

    cyg_uint32 gpio_or;

    HAL_READ_UINT32(GPIO_OR, gpio_or);

    if (state) {

        // Assert CLE

        gpio_or |= _MOAB_CLE;

    } else {

        // De-assert CLE

        gpio_or &= ~_MOAB_CLE;

    }

    HAL_WRITE_UINT32(GPIO_OR, gpio_or);

}

//

// Prepare to send address byte(s) to the NAND interface

//

static void __inline__

moab_ALE(int state)

{

    cyg_uint32 gpio_or;

    HAL_READ_UINT32(GPIO_OR, gpio_or);

    if (state) {

        // Assert ALE

        gpio_or |= _MOAB_ALE;

    } else {

        // De-assert ALE

        gpio_or &= ~_MOAB_ALE;

    }

    HAL_WRITE_UINT32(GPIO_OR, gpio_or);

}

//

// Wait until the NAND device is ready (after a long operation)

//

static bool __inline__

moab_RDY(void)

{

    cyg_uint32 gpio_ir;

    HAL_READ_UINT32(GPIO_IR, gpio_ir);

    return ((gpio_ir & _MOAB_RDY) != 0);

}

#include <cyg/io/flash_tc58xxx.inl>

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

// EOF moab_nand_flash.c