ppc750fx_set_clock_freqs.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. 
 * $ 
 */

/*
 * ppc750fx_set_clock_freqs.c
 * Set the cpu_freq, cycles_freq, and timer_freq variables, based on
 * the main system clock
 *
 */

#include "startup.h"
#include <ppc/603cpu.h>
#include <ppc/700cpu.h>

/*
 * The PPC750FX has dual PLL support, and has a HID1 bit field as follows:
 * 0:4 - external PLL configuration - read only
 * 5:6 - external PLL range - read only - 0:0 == 600MHz - 733MHz, 1:0 == less than 600 MHz
 * 7:13 - reserved
 * 14 - 0: external bits 0:6 control PLL0, 1: internal bits 16:22 control PLL 0 
 * 15 - 0: PLL0 is source for processor clock, 1: PLL1 is source for processor clock
 * 16:20 - PLL0 configuration bits
 * 21:22 - PLL0 range bits
 * 23 - reserved
 * 24:28 - PLL1 configuration bits
 * 29:30 - PLL1 range bits
 * 31 - reserved
 */

void
ppc750fx_set_clock_freqs(unsigned clock) {
	ppc600_set_clock_freqs(clock);
}