cache.c.svn-base

Spearhead2000 的 USB驱动程序

/***************************************************************************
 * Copyright Intel Corporation, March 18th 1998.  All rights reserved.
 * Copyright ARM Limited 1998, 1999.  All rights reserved.
 ***************************************************************************/
/***************************************************************************

  This file contains the routines to enable & disable the instruction & data
  caches and the write-back buffer.

****************************************************************************/

// $Id: cache.c,v 1.1 2005/05/26 15:51:47 sp_head Exp $

// $Log: cache.c,v $
// Revision 1.1  2005/05/26 15:51:47  sp_head
// user NI
//
// Revision 1.1.1.2  2004/12/03 15:34:24  spear
// First import from CRD
//
// Revision 1.1.1.1  2004/12/02 11:07:22  spear
// First import from CRD
//
// 
//  Revision: 1.1 Mon Sep 13 21:32:55 2004 gazzina
//  freeze pre-AFE
// 
//  Revision: 1.3 Thu Jul  3 12:37:59 2003 lert
//  Turn On MPU on I/D Cache Functions  Enable MPU even for Icache Enable
// 
//  Revision: 1.2 Fri Jan 31 10:54:29 2003 lert
//  Another bug on Firmware suite ?....  EnableMMU Added on uHALr_EnableCache
// 
//  Revision: 1.1 Thu Dec 19 15:47:54 2002 lert
//  First Check In

#include  "uhal.h"
#include  "mmu_h.h"

// Enable all caching
void uHALr_EnableCache(void)
{
  int	mode = uHALir_ReadCacheMode() ;
    
  // Active ICache/DCache/Write Buffer
  uHALir_WriteCacheMode(mode | (IC_ON + DC_ON + WB_ON + EnableMMU)) ;
}

// Enable instruction cache
void uHALir_EnableICache(void)
{
  int mode = uHALir_ReadCacheMode();

  uHALir_WriteCacheMode(mode | IC_ON + WB_ON + EnableMMU);
}

// Enable data cache
void uHALir_EnableDCache(void)
{
  int mode = uHALir_ReadCacheMode();
  
  uHALir_WriteCacheMode(mode | DC_ON + WB_ON + EnableMMU);
}

// Enable write buffer
void uHALir_EnableWriteBuffer(void)
{
   int mode = uHALir_ReadCacheMode();

   uHALir_WriteCacheMode(mode | WB_ON);
}

// Disable all caching
void uHALr_DisableCache(void)
{
  uHALir_DisableICache();
  uHALir_DisableDCache();
  uHALir_DisableWriteBuffer();
}