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

//

//      plf_misc.c

//

//      HAL platform miscellaneous functions

//

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

//####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):    nickg

// Contributors: nickg, jlarmour

// Date:         1999-09-09

// Purpose:      HAL miscellaneous functions

// Description:  This file contains miscellaneous functions provided by the

//               HAL.

//

//####DESCRIPTIONEND####

//

//========================================================================*/

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>         // Base types

#include <cyg/hal/hal_arch.h>           // architectural definitions

#include <cyg/hal/hal_io.h>

#include <cyg/hal/hal_if.h>

#include <cyg/hal/plf_intr.h>

#include <cyg/hal/var_arch.h>

/*------------------------------------------------------------------------*/

void hal_platform_init(void)

{

    hal_if_init();

}

void h8300h_reset(void)

{

    __asm__ ("ldc #0x80,ccr\n"

             "jmp @@0\n\t");

}

/*------------------------------------------------------------------------*/

/* Control C ISR support                                                  */

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)

struct Hal_SavedRegisters *hal_saved_interrupt_state;

#endif

/*------------------------------------------------------------------------*/

/* clock support                                                            */

void hal_clock_initialize(cyg_uint32 period)

{

    CYG_BYTE prescale;

#if CYGNUM_HAL_H8300_RTC_PRESCALE == 8

    prescale = 0x01;

#else

#if CYGNUM_HAL_H8300_RTC_PRESCALE == 64

    prescale = 0x02;

#else

#if CYGNUM_HAL_H8300_RTC_PRESCALE == 8192

    prescale = 0x03;

#else

#error illigal RTC prescale setting

#endif

#endif

#endif

    HAL_WRITE_UINT8(CYGARC_TCORA3,period);

    HAL_WRITE_UINT8(CYGARC_8TCNT3,0x00);

    HAL_WRITE_UINT8(CYGARC_8TCR3,0x48 | prescale);

    HAL_WRITE_UINT8(CYGARC_8TCSR3,0x00);

}

void hal_clock_reset(cyg_uint32 vector, cyg_uint32 period)

{

    HAL_WRITE_UINT8(CYGARC_8TCR3,0x00);

    HAL_WRITE_UINT8(CYGARC_8TCSR3,0x00);

    hal_clock_initialize(period);

}

void hal_clock_read(cyg_uint32 *pvalue)

{

    CYG_BYTE val;

    HAL_READ_UINT8(CYGARC_8TCNT3,val);

    *pvalue = val;

}

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

// Low-level delay (in microseconds)

#if 0

void hal_delay_us(int usecs)

{

    volatile CYG_BYTE *tcr  = (CYG_BYTE *)CYGARC_8TCR2;

    volatile CYG_BYTE *tcnt = (CYG_BYTE *)CYGARC_8TCNT2;

    short clocks_per_us = (CYGHWR_HAL_H8300_PROCESSOR_SPEED/1000000)/8*25;

    //short clocks_per_us = (CYGHWR_HAL_H8300_PROCESSOR_SPEED/1000000)/20;

    unsigned char val1,val2;

    short diff;

    usecs /= 25;

    *tcnt = 0x00;

    *tcr  = 0x01;

    diff = 0;

    while (usecs > 0) {

        while (diff < clocks_per_us) {

            val1 = *tcnt;

            while ((val2 = *tcnt) == val1);

            if (val2 < val1)

                diff += val2 + 0x100 - val1;

            else

                diff += val2 - val1;

        }

        usecs -= diff / clocks_per_us;

        diff -= clocks_per_us;

    }

    *tcr  = 0x00;

}

#endif

/*------------------------------------------------------------------------*/

/* End of plf_misc.c                                                      */