2013-01-08 21:05:02 +08:00
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/*
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* File : cpu.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-07-09 Bernard first version
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* 2010-09-11 Bernard add CPU reset implementation
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*/
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#include <rtthread.h>
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#include <jz4755.h>
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/* Watchdog definitions */
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#define WDT_CLK_PRESCALE_CLK1 ( 0x0 << 3)
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#define WDT_CLK_PRESCALE_CLK4 ( 0x1 << 3)
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#define WDT_CLK_PRESCALE_CLK16 ( 0x2 << 3)
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#define WDT_CLK_PRESCALE_CLK64 ( 0x3 << 3)
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#define WDT_CLK_PRESCALE_CLK256 ( 0x4 << 3)
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#define WDT_CLK_PRESCALE_CLK1024 ( 0x5 << 3)
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#define WDT_CLK_PRESCALE_MASK ( 0x3F << 3)
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#define WDT_CLK_EXTAL ( 0x1 << 2)
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#define WDT_CLK_RTC ( 0x1 << 1)
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#define WDT_CLK_PCLK ( 0x1 << 0)
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#define WDT_CLK_MASK ( 7 )
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#define WDT_ENABLE ( 1 << 0 )
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/**
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* @addtogroup Jz47xx
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*/
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/*@{*/
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/**
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* this function will reset CPU
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*
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*/
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void rt_hw_cpu_reset()
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{
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/* open the watch-dog */
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WDT_TCSR = WDT_CLK_EXTAL;
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WDT_TCSR |= WDT_CLK_PRESCALE_CLK1024;
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WDT_TDR = 0x03;
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WDT_TCNT = 0x00;
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WDT_TCER |= WDT_ENABLE;
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rt_kprintf("reboot system...\n");
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while (1);
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}
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/**
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* this function will shutdown CPU
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*
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*/
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void rt_hw_cpu_shutdown()
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{
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rt_kprintf("shutdown...\n");
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while (1);
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}
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/*@}*/
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