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#ifndef CYGONCE_HAL_CLOCK_H
#define CYGONCE_HAL_CLOCK_H
 
//=============================================================================
//
//      hal_clock.h
//
//      HAL clock support
//
//=============================================================================
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// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
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// version.                                                                 
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// for more details.                                                        
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//
// 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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// this file does not by itself cause the resulting work to be covered by   
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// General Public License v2.                                               
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// ####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