ppc85xx_init_l2_cache.c

qnx powerpc MPC8245的 BSP源文件

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software except in  
 * compliance with the License. You may obtain a copy of the License  
 * at: http://www.apache.org/licenses/LICENSE-2.0  
 *  
 * Unless required by applicable law or agreed to in writing, software  
 * distributed under the License is distributed on an "AS IS" basis,  
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $ 
 */

#include "startup.h"
#include <ppc/85xxcpu.h>

// Init the L2 cache on PPC85xx family chips. 

#define PPC85XX_L2CTL  (immr_paddr + 0x20000)

void 
ppc85xx_init_l2_cache(void) {
	uint32_t l2c_vloc, l2c;
	  
	l2c_vloc = (uint32_t)startup_io_map(4, PPC85XX_L2CTL);

	ppc_isync();
	l2c = in32(l2c_vloc);
	out32(l2c_vloc, l2c | 0x08000000);
	in32(l2c_vloc);
	ppc_sync();
	
	ppc_isync();
	l2c = in32(l2c_vloc);
	out32(l2c_vloc, l2c | 0x40000000);
	while(in32(l2c_vloc) & 0x40000000);
	ppc_sync();

	ppc_isync();
	l2c = in32(l2c_vloc);
	out32(l2c_vloc, l2c | 0x80000000);
	in32(l2c_vloc);
	ppc_sync();
	
	startup_io_unmap(l2c_vloc);
}