hal_cache.h

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#ifndef CYGONCE_HAL_CACHE_H
#define CYGONCE_HAL_CACHE_H

//=============================================================================
//
//      hal_cache.h
//
//      HAL cache control API
//
//=============================================================================
//####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
// Contributors:        nickg, gthomas
// Date:        1998-09-28
// Purpose:     Cache control API
// Description: The macros defined here provide the HAL APIs for handling
//              cache control operations.
// Usage:
//              #include <cyg/hal/hal_cache.h>
//              ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <cyg/infra/cyg_type.h>
#include <cyg/hal/hal_mmu.h>

//-----------------------------------------------------------------------------
// FIXME: This definition forces the IO flash driver to use a
// known-good procedure for fiddling flash before calling flash device
// driver functions. The procedure breaks on other platform/driver
// combinations though so is depricated. Hence this definition.
//
// If you work on this target, please try to remove this definition
// and verify that the flash driver still works (both from RAM and
// flash). If it does, remove the definition and this comment for good
// [and the old macro definition if this happens to be the last client
// of that code].
#define HAL_FLASH_CACHES_OLD_MACROS

//-----------------------------------------------------------------------------
// Cache dimensions

#define HAL_UCACHE_SIZE                 0x2000   // Size of data cache in bytes
#define HAL_UCACHE_LINE_SIZE            16       // Size of a data cache line
#define HAL_UCACHE_WAYS                 4        // Associativity of the cache
#define HAL_UCACHE_SETS (HAL_UCACHE_SIZE/(HAL_UCACHE_LINE_SIZE*HAL_UCACHE_WAYS))

#define HAL_CACHE_UNIFIED   // Let programs know the caches are combined

//-----------------------------------------------------------------------------
// Global control of caches

// Note: the 'mrc' doesn't seem to work.
#if 0
// Enable the data cache
//    mrc  MMU_CP,0,r1,MMU_Control,c0
//    orr  r1,r1,#MMU_Control_C|MMU_Control_B
//    mcr  MMU_CP,0,r1,MMU_Control,c0    

#define HAL_UCACHE_ENABLE()                     \
{                                               \
    asm volatile ("mrc  p15,0,r1,c1,c0;"        \
                  "orr  r1,r1,#0x000C;"         \
                  "mcr  p15,0,r1,c1,c0;"        \
                  :                             \
                  :                             \
                  : "r1" /* Clobber list */     \
        );                                      \
                                                \
}

// Disable the data cache
#define HAL_UCACHE_DISABLE()                     \
{                                               \
    asm volatile ("mrc  p15,0,r1,c1,c0;"        \
                  "bic  r1,r1,#0x000C;"         \
                  "mcr  p15,0,r1,c1,c0;"        \
                  :                             \
                  :                             \
                  : "r1" /* Clobber list */     \
        );                                      \
                                                \
}
#else
#define HAL_UCACHE_ENABLE()                     \
{                                               \
    asm volatile ("mov  r1,#0x7D;"              \
                  "mcr  p15,0,r1,c1,c0,0;"      \
                  :                             \
                  :                             \
                  : "r1" /* Clobber list */     \
        );                                      \
}

// Disable the data cache
#define HAL_UCACHE_DISABLE()                                            \
{                                                                       \
    asm volatile ("mov  r1,#0x71;"                                      \
                  "mcr  p15,0,r1,c1,c0,0;"                              \
                  "mov  r1,#0;"                                         \
                  "mcr  p15,0,r1,c8,c7,0;"  /* flush I+D TLBs */        \
                  "nop; nop; nop; nop; nop;"                            \
                  :                                                     \
                  :                                                     \
                  : "r1" /* Clobber list */                             \
        );                                                              \
}
#endif

// Is the cache turned on?
#define HAL_UCACHE_IS_ENABLED(_state_) _state_ = 1;

// Invalidate the entire cache
//    mcr  MMU_CP,0,r1,MMU_InvalidateCache,c0
#define HAL_UCACHE_INVALIDATE_ALL()             \
{                                               \
    asm volatile (                              \
        "mov    r1,#0;"                         \
	"mcr p15,0,r1,c7,c7,0;"                 \
	:                                       \
        :                                       \
        : "r1","memory" /* Clobber list */      \
    );                                          \
                                                \
}

// Synchronize the contents of the cache with memory.
#define HAL_UCACHE_SYNC()                                               \
{                                                                       \
    cyg_uint32 *RAM = (cyg_uint32 *)0x00000000;                         \
    int i;                                                              \
    volatile cyg_uint32 val;                                            \
    for (i = 0;  i < HAL_UCACHE_SETS;  i++) {                           \
        val = *RAM;                                                     \
        RAM += HAL_UCACHE_LINE_SIZE;                                    \
    }                                                                   \
}

// Purge contents of data cache
#define HAL_UCACHE_PURGE_ALL()  HAL_UCACHE_INVALIDATE_ALL()

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

// Set the data cache write mode
//#define HAL_UCACHE_WRITE_MODE( _mode_ )

//#define HAL_UCACHE_WRITETHRU_MODE       0
//#define HAL_UCACHE_WRITEBACK_MODE       1

// Load the contents of the given address range into the data cache
// and then lock the cache so that it stays there.
//#define HAL_UCACHE_LOCK(_base_, _size_)

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

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

//-----------------------------------------------------------------------------
// Data cache line control

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

// Write dirty cache lines to memory and invalidate the cache entries
// for the given address range.
#define HAL_UCACHE_FLUSH( _base_ , _size_ )  HAL_UCACHE_SYNC()

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

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

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

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

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

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

#define HAL_DCACHE_SIZE                 HAL_UCACHE_SIZE
#define HAL_DCACHE_LINE_SIZE            HAL_UCACHE_LINE_SIZE
#define HAL_DCACHE_WAYS                 HAL_UCACHE_WAYS
#define HAL_DCACHE_SETS                 HAL_UCACHE_SETS

// Enable the data cache
#define HAL_DCACHE_ENABLE()             HAL_UCACHE_ENABLE()

// Disable the data cache
#define HAL_DCACHE_DISABLE()            HAL_UCACHE_DISABLE()

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

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

// Query the state of the data cache
#define HAL_DCACHE_IS_ENABLED(_state_)  HAL_UCACHE_IS_ENABLED(_state_)

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

// Set the data cache write mode
//#define HAL_DCACHE_WRITE_MODE( _mode_ )

//#define HAL_DCACHE_WRITETHRU_MODE       0
//#define HAL_DCACHE_WRITEBACK_MODE       1

// Load the contents of the given address range into the data 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()

//-----------------------------------------------------------------------------
// Data 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_ )  HAL_UCACHE_FLUSH( _base_ , _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_ )  HAL_UCACHE_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 - use Data cache controls since they
// are not separatable.

#define HAL_ICACHE_SIZE                 HAL_UCACHE_SIZE
#define HAL_ICACHE_LINE_SIZE            HAL_UCACHE_LINE_SIZE
#define HAL_ICACHE_WAYS                 HAL_UCACHE_WAYS
#define HAL_ICACHE_SETS                 HAL_UCACHE_SETS

// Enable the instruction cache
#define HAL_ICACHE_ENABLE()      HAL_UCACHE_ENABLE()

// Disable the instruction cache
#define HAL_ICACHE_DISABLE()     HAL_UCACHE_DISABLE()

// Is the cache turned on?
#define HAL_ICACHE_IS_ENABLED(_state_) HAL_UCACHE_IS_ENABLED(_state_)

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

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

// 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_ )

//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_CACHE_H
// End of hal_cache.h