Subversion Repositories openrisc_me

#ifndef CYGONCE_HAL_CLOCK_H

#define CYGONCE_HAL_CLOCK_H

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

//

//      hal_clock.h

//

//      HAL clock support

//

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

//####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, gthomas, hmt

// Contributors:        nickg, gthomas, hmt

// Date:        1999-01-28

// Purpose:     Define clock support

// Description: The macros defined here provide the HAL APIs for handling

//              the clock.

//              

// Usage:

//              #include <cyg/hal/hal_intr.h> // which includes this file

//              ...

//              

//

//####DESCRIPTIONEND####

//

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

#include <cyg/hal/hal_io.h>

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

// Clock control

// in erc32 simulator:

//  4 = UART A

//  5 = UART B

//  7 = UART error

// 12 = GPT (general purpose timer)

// 13 = RTC (realtime clock)

// 15 = watchdog

// in erc32 simulator:

// The vector used by the Real time clock is defined in hal_xpic.h

// We could place conditional code here to choose one clock or the other

// depending on the selected interrupt vector... but pro tem: (pun intended)

#define SPARC_MEC_RTC_CLOCK_SCALE (5)

/* These must be accessed word-wide to work! */

#define SPARC_MEC_RTC              (0x01f80080)

#define SPARC_MEC_RTC_COUNTER    (SPARC_MEC_RTC +    0)

#define SPARC_MEC_RTC_SCALER     (SPARC_MEC_RTC +    4)

#define SPARC_MEC_GPT_COUNTER    (SPARC_MEC_RTC +    8)

#define SPARC_MEC_GPT_SCALER     (SPARC_MEC_RTC + 0x0c)

/* MEC timer control register bits */

#define SPARC_MEC_TCR_GACR 1      /* Continuous Running */

#define SPARC_MEC_TCR_GACL 2      /* Counter Load */      

#define SPARC_MEC_TCR_GASE 4      /* System Enable */     

#define SPARC_MEC_TCR_GASL 8      /* not used */          

#define SPARC_MEC_TCR_TCRCR 0x100 /* Continuous Running */

#define SPARC_MEC_TCR_TCRCL 0x200 /* Counter Load */

#define SPARC_MEC_TCR_TCRSE 0x400 /* System Enable */

#define SPARC_MEC_TCR_TCRSL 0x800 /* not used */

#define SPARC_MEC_RTC_CONTROL    (SPARC_MEC_RTC + 0x18)

externC cyg_int32 cyg_hal_sparclite_clock_period;

#define HAL_CLOCK_INITIALIZE( _period_ ) CYG_MACRO_START              \

  HAL_WRITE_UINT32( SPARC_MEC_RTC_SCALER, SPARC_MEC_RTC_CLOCK_SCALE );\

  cyg_hal_sparclite_clock_period = (_period_);                        \

  HAL_WRITE_UINT32( SPARC_MEC_RTC_COUNTER, (_period_) );              \

  HAL_WRITE_UINT32( SPARC_MEC_RTC_CONTROL,                            \

                           (SPARC_MEC_TCR_TCRCR |                     \

                            SPARC_MEC_TCR_TCRCL |                     \

                            SPARC_MEC_TCR_TCRSE) );                   \

CYG_MACRO_END

#define HAL_CLOCK_RESET( _vector_, _period_ ) /* nowt, it is freerunning */

#define HAL_CLOCK_READ( _pvalue_ ) CYG_MACRO_START                    \

   cyg_uint32 _read_;                                                 \

   HAL_READ_UINT32( SPARC_MEC_RTC_COUNTER, _read_ );                  \

   *((cyg_uint32 *)(_pvalue_)) =                                      \

                 (cyg_hal_sparclite_clock_period - _read_ );          \

CYG_MACRO_END

#ifdef CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY

#define HAL_CLOCK_LATENCY( _pvalue_ )         HAL_CLOCK_READ( _pvalue_ )

#endif

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

#endif // ifndef CYGONCE_HAL_CLOCK_H

// End of hal_clock.h