var_cache.h

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#ifndef CYGONCE_VAR_CACHE_H
#define CYGONCE_VAR_CACHE_H
//=============================================================================
//
//      var_cache.h
//
//      Variant HAL cache control API
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   nickg
// Contributors:nickg, jskov
// Date:        2000-04-02
// Purpose:     Variant cache control API
// Description: The macros defined here provide the HAL APIs for handling
//              cache control operations on the SH variant CPUs.
// Usage:       Is included via the architecture cache header:
//              #include <cyg/hal/hal_cache.h>
//              ...
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>

#include <cyg/hal/sh_regs.h>

#include <cyg/hal/plf_cache.h>

#include <cyg/hal/hal_io.h>

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

#ifndef HAL_DCACHE_DEFINED

#define HAL_DCACHE_SIZE                 CYGARC_SH_MOD_CAC_D_SIZE
#define HAL_DCACHE_LINE_SIZE            CYGARC_SH_MOD_CAC_D_LINE_SIZE
#define HAL_DCACHE_WAYS                 CYGARC_SH_MOD_CAC_D_WAYS
#define HAL_DCACHE_SETS                 (HAL_DCACHE_SIZE/(HAL_DCACHE_LINE_SIZE*HAL_DCACHE_WAYS))

// Cache addressing information
#define CYGARC_REG_DCACHE_ADDRESS_BASE   CYGARC_SH_MOD_DCAC_ADDRESS_BASE
#define CYGARC_REG_DCACHE_ADDRESS_TOP    CYGARC_SH_MOD_DCAC_ADDRESS_TOP
#define CYGARC_REG_DCACHE_ADDRESS_STEP   CYGARC_SH_MOD_DCAC_ADDRESS_STEP
#define CYGARC_REG_DCACHE_ADDRESS_FLUSH  CYGARC_SH_MOD_DCAC_ADDRESS_FLUSH

#define HAL_DCACHE_DEFINED
#endif

#ifndef HAL_ICACHE_DEFINED

#define HAL_ICACHE_SIZE                 CYGARC_SH_MOD_CAC_I_SIZE
#define HAL_ICACHE_LINE_SIZE            CYGARC_SH_MOD_CAC_I_LINE_SIZE
#define HAL_ICACHE_WAYS                 CYGARC_SH_MOD_CAC_I_WAYS
#define HAL_ICACHE_SETS                 (HAL_ICACHE_SIZE/(HAL_ICACHE_LINE_SIZE*HAL_ICACHE_WAYS))

// Cache addressing information
#define CYGARC_REG_ICACHE_ADDRESS_BASE   CYGARC_SH_MOD_ICAC_ADDRESS_BASE
#define CYGARC_REG_ICACHE_ADDRESS_TOP    CYGARC_SH_MOD_ICAC_ADDRESS_TOP
#define CYGARC_REG_ICACHE_ADDRESS_STEP   CYGARC_SH_MOD_ICAC_ADDRESS_STEP
#define CYGARC_REG_ICACHE_ADDRESS_FLUSH  CYGARC_SH_MOD_ICAC_ADDRESS_FLUSH

#define HAL_ICACHE_DEFINED
#endif


//-----------------------------------------------------------------------------
// Global control of cache

// This is all handled in assembly (see variant.S) due to a requirement about
// not fiddling the cache from cachable memory.

externC void cyg_hal_dcache_enable(void);
externC void cyg_hal_dcache_disable(void);
externC void cyg_hal_dcache_invalidate_all(void);
externC void cyg_hal_dcache_sync(void);
externC void cyg_hal_dcache_sync_region(cyg_haladdress base, 
                                        cyg_haladdrword len);
externC void cyg_hal_dcache_write_mode(int mode);

// Enable the cache
#define HAL_DCACHE_ENABLE() cyg_hal_dcache_enable()

// Disable the cache
#define HAL_DCACHE_DISABLE() cyg_hal_dcache_disable()

// Invalidate the entire cache
#define HAL_DCACHE_INVALIDATE_ALL() cyg_hal_dcache_invalidate_all()

// Synchronize the contents of the cache with memory.
#define HAL_DCACHE_SYNC() cyg_hal_dcache_sync()

// Query the state of the cache (does not affect the caching)
#define HAL_DCACHE_IS_ENABLED(_state_)                  \
    CYG_MACRO_START                                     \
    cyg_uint32 _tmp;                                    \
    HAL_READ_UINT32(CYGARC_REG_CCR, _tmp);              \
    (_state_) = (_tmp & CYGARC_REG_CCR_OCE) ? 1 : 0;    \
    CYG_MACRO_END

// Set the cache refill burst size
//#define HAL_ICACHE_BURST_SIZE(_size_)

// Set the cache write mode
#define HAL_DCACHE_WRITE_MODE( _mode_ )         \
    CYG_MACRO_START                             \
    cyg_uint32 _m_;                             \
    if (HAL_DCACHE_WRITETHRU_MODE == _mode_)    \
      _m_ = CYGARC_REG_CCR_WT;                  \
    else                                        \
      _m_ = CYGARC_REG_CCR_CB;                  \
    cyg_hal_dcache_write_mode(_m_);             \
    CYG_MACRO_END

#define HAL_DCACHE_WRITETHRU_MODE       0
#define HAL_DCACHE_WRITEBACK_MODE       1

// This macro allows the client to specify separate modes for the two
// regions.
#define HAL_DCACHE_WRITE_MODE_SH( _mode_ ) cyg_hal_dcache_write_mode(_mode_)

// Load the contents of the given address range into the cache
// and then lock the cache so that it stays there.
//#define HAL_DCACHE_LOCK(_base_, _size_)
        
// Undo a previous lock operation
//#define HAL_DCACHE_UNLOCK(_base_, _size_)

// Unlock entire cache
//#define HAL_DCACHE_UNLOCK_ALL()

//-----------------------------------------------------------------------------
// Cache line control

// Allocate cache lines for the given address range without reading its
// contents from memory.
//#define HAL_DCACHE_ALLOCATE( _base_ , _size_ )

// Write dirty cache lines to memory and invalidate the cache entries
// for the given address range.
#define HAL_DCACHE_FLUSH( _base_ , _size_ ) \
 cyg_hal_dcache_sync_region((cyg_haladdress)_base_, (cyg_haladdrword)_size_)

// Invalidate cache lines in the given range without writing to memory.
//#define HAL_DCACHE_INVALIDATE( _base_ , _size_ )

// Write dirty cache lines to memory for the given address range.
//#define HAL_DCACHE_STORE( _base_ , _size_ )


// Preread the given range into the cache with the intention of reading
// from it later.
//#define HAL_DCACHE_READ_HINT( _base_ , _size_ )

// Preread the given range into the cache with the intention of writing
// to it later.
//#define HAL_DCACHE_WRITE_HINT( _base_ , _size_ )

// Allocate and zero the cache lines associated with the given range.
//#define HAL_DCACHE_ZERO( _base_ , _size_ )


//-----------------------------------------------------------------------------
// Global control of Instruction cache

externC void cyg_hal_icache_enable(void);
externC void cyg_hal_icache_disable(void);
externC void cyg_hal_icache_invalidate_all(void);

// Enable the cache
#define HAL_ICACHE_ENABLE() cyg_hal_icache_enable()

// Disable the cache
#define HAL_ICACHE_DISABLE() cyg_hal_icache_disable()

// Invalidate the entire cache
#define HAL_ICACHE_INVALIDATE_ALL() cyg_hal_icache_invalidate_all()

// Synchronize the contents of the cache with memory.
#define HAL_ICACHE_SYNC() HAL_ICACHE_INVALIDATE_ALL()

// Query the state of the cache (does not affect the caching)
#define HAL_ICACHE_IS_ENABLED(_state_)                  \
    CYG_MACRO_START                                     \
    cyg_uint32 _tmp;                                    \
    HAL_READ_UINT32(CYGARC_REG_CCR, _tmp);              \
    (_state_) = (_tmp & CYGARC_REG_CCR_ICE) ? 1 : 0;    \
    CYG_MACRO_END

// Set the instruction cache refill burst size
//#define HAL_ICACHE_BURST_SIZE(_size_)

// Load the contents of the given address range into the instruction cache
// and then lock the cache so that it stays there.

//#define HAL_ICACHE_LOCK(_base_, _size_)

// Undo a previous lock operation
//#define HAL_ICACHE_UNLOCK(_base_, _size_)

// Unlock entire cache
//#define HAL_ICACHE_UNLOCK_ALL()

//-----------------------------------------------------------------------------
// Instruction cache line control

// Invalidate cache lines in the given range without writing to memory.
//#define HAL_ICACHE_INVALIDATE( _base_ , _size_ )

//-----------------------------------------------------------------------------
// Flash related cache macros

#define HAL_FLASH_CACHES_OFF(_d_, _i_)          \
    CYG_MACRO_START                             \
    HAL_ICACHE_IS_ENABLED(_i_);                 \
    HAL_DCACHE_IS_ENABLED(_d_);                 \
    HAL_DCACHE_SYNC();                          \
    HAL_DCACHE_INVALIDATE_ALL();                \
    HAL_DCACHE_DISABLE();                       \
    HAL_ICACHE_INVALIDATE_ALL();                \
    HAL_ICACHE_DISABLE();                       \
    CYG_MACRO_END

#define HAL_FLASH_CACHES_ON(_d_, _i_)           \
    CYG_MACRO_START                             \
    if (_d_) HAL_DCACHE_ENABLE();               \
    if (_i_) HAL_ICACHE_ENABLE();               \
    CYG_MACRO_END

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_VAR_CACHE_H
// End of var_cache.h