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):   gthomas
// Contributors:hmt
//              Travis C. Furrer <[e-mail]>
// Date:        2000-05-08
// 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_sa11x0.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].
#if defined(CYGPKG_HAL_ARM_SA11X0_ASSABET) \
    || defined(CYGPKG_HAL_ARM_SA11X0_SA1100MM)
# define HAL_FLASH_CACHES_OLD_MACROS
#endif

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

#define HAL_ICACHE_SIZE                 SA11X0_ICACHE_SIZE
#define HAL_ICACHE_LINE_SIZE            SA11X0_ICACHE_LINESIZE_BYTES
#define HAL_ICACHE_WAYS                 SA11X0_ICACHE_WAYS
#define HAL_ICACHE_SETS (HAL_ICACHE_SIZE/(HAL_ICACHE_LINE_SIZE*HAL_ICACHE_WAYS))

#define HAL_DCACHE_SIZE                 SA11X0_DCACHE_SIZE
#define HAL_DCACHE_LINE_SIZE            SA11X0_DCACHE_LINESIZE_BYTES
#define HAL_DCACHE_WAYS                 SA11X0_DCACHE_WAYS
#define HAL_DCACHE_SETS (HAL_DCACHE_SIZE/(HAL_DCACHE_LINE_SIZE*HAL_DCACHE_WAYS))

// FIXME: much of the code below should make better use of
// the definitions from hal_mmu.h

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

// Enable the instruction cache
#define HAL_ICACHE_ENABLE()                                             \
CYG_MACRO_START                                                         \
    asm volatile (                                                      \
        "mrc  p15,0,r1,c1,c0,0;"                                        \
        "orr  r1,r1,#0x1000;"                                           \
        "orr  r1,r1,#0x0003;" /* enable ICache (also ensures   */       \
                              /* that MMU and alignment faults */       \
                              /* are enabled)                  */       \
        "mcr  p15,0,r1,c1,c0,0"                                         \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Disable the instruction cache (and invalidate it, required semanitcs)
#define HAL_ICACHE_DISABLE()                                            \
CYG_MACRO_START                                                         \
    asm volatile (                                                      \
        "mrc    p15,0,r1,c1,c0,0;"                                      \
        "bic    r1,r1,#0x1000;" /* disable ICache (but not MMU, etc) */ \
        "mcr    p15,0,r1,c1,c0,0;"                                      \
        "mov    r1,#0;"                                                 \
        "mcr    p15,0,r1,c7,c5,0;"  /* flush ICache */                  \
        "nop;" /* next few instructions may be via cache    */          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop"                                                           \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Query the state of the instruction cache
#define HAL_ICACHE_IS_ENABLED(_state_)                                   \
CYG_MACRO_START                                                          \
    register cyg_uint32 reg;                                             \
    asm volatile ("mrc  p15,0,%0,c1,c0,0"                                \
                  : "=r"(reg)                                            \
                  :                                                      \
        );                                                               \
    (_state_) = (0 != (0x1000 & reg)); /* Bit 12 is ICache enable */     \
CYG_MACRO_END

// Invalidate the entire cache
#define HAL_ICACHE_INVALIDATE_ALL()                                     \
CYG_MACRO_START                                                         \
    /* this macro can discard dirty cache lines (N/A for ICache) */     \
    asm volatile (                                                      \
        "mov    r1,#0;"                                                 \
        "mcr    p15,0,r1,c7,c5,0;"  /* flush ICache */                  \
        "mcr    p15,0,r1,c8,c5,0;"  /* flush ITLB only */               \
        "nop;" /* next few instructions may be via cache    */          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        "nop;"                                                          \
        :                                                               \
        :                                                               \
        : "r1" /* Clobber list */                                       \
        );                                                              \
CYG_MACRO_END

// Synchronize the contents of the cache with memory.
// (which includes flushing out pending writes)
#define HAL_ICACHE_SYNC()                                       \
CYG_MACRO_START                                                 \
    HAL_DCACHE_SYNC(); /* ensure data gets to RAM */            \
    HAL_ICACHE_INVALIDATE_ALL(); /* forget all we know */       \
CYG_MACRO_END

// Set the instruction cache refill burst size
//#define HAL_ICACHE_BURST_SIZE(_size_)
// This feature is not available on the SA11X0.

// 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_)
// This feature is not available on the SA11X0.

// Undo a previous lock operation
//#define HAL_ICACHE_UNLOCK(_base_, _size_)
// This feature is not available on the SA11X0.

// Unlock entire cache
//#define HAL_ICACHE_UNLOCK_ALL()
// This feature is not available on the SA11X0.

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

// Invalidate cache lines in the given range without writing to memory.
//#define HAL_ICACHE_INVALIDATE( _base_ , _size_ )
// This feature is not available on the SA11X0.