ppc8260_init_raminfo.c

来自「qnx powerpc MPC8245的 BSP源文件」· C语言 代码 · 共 55 行

/*
 * $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. 
 * $ 
 */



/*
 * ppc8260_init_raminfo.c
 * Tell syspage about our RAM configuration
 */
#include "startup.h"

void ppc8260_init_raminfo(void) {
	paddr_t		start;
	unsigned	brx, orx, index;
	uintptr_t	pv_immr_base_addr = startup_io_map(0x14000, immr_paddr);

	/*
	 * BRx : bit 31   : valid bit
	 *       bit 24-26: MS : 010 SDRAM-60x bus
	 *       bit 0-16 : Base address
	 * ORx : bit 5-11 : SDRAM address mask
	 */

	for (index = PPC8260_IMMR_OFF_BR0; index <= PPC8260_IMMR_OFF_BR11; 
					index += (PPC8260_IMMR_OFF_BR1 - PPC8260_IMMR_OFF_BR0)) {
		brx = in32(pv_immr_base_addr + index);
		if ((brx & 0xE1) == 0x41) {
			start = brx & 0xFFFF8000;
			orx = in32(pv_immr_base_addr + index + (PPC8260_IMMR_OFF_OR0 - PPC8260_IMMR_OFF_BR0));
			add_ram(start, MEG((((~orx) & 0xFFF00000) >> 20) + 1));
		}
	}

	startup_io_unmap(pv_immr_base_addr);
}