194 lines
3.0 KiB
C
194 lines
3.0 KiB
C
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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, RT-Thread Develop 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://openlab.rt-thread.com/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-01-13 weety modified from mini2440
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "at91sam926x.h"
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/**
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* @addtogroup AT91SAM926X
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*/
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/*@{*/
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#define ICACHE_MASK (rt_uint32_t)(1 << 12)
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#define DCACHE_MASK (rt_uint32_t)(1 << 2)
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#ifdef __GNUC__
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rt_inline rt_uint32_t cp15_rd(void)
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{
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rt_uint32_t i;
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asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
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return i;
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}
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rt_inline void cache_enable(rt_uint32_t bit)
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{
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__asm__ __volatile__( \
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"mrc p15,0,r0,c1,c0,0\n\t" \
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"orr r0,r0,%0\n\t" \
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"mcr p15,0,r0,c1,c0,0" \
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: \
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:"r" (bit) \
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:"memory");
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}
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rt_inline void cache_disable(rt_uint32_t bit)
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{
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__asm__ __volatile__( \
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"mrc p15,0,r0,c1,c0,0\n\t" \
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"bic r0,r0,%0\n\t" \
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"mcr p15,0,r0,c1,c0,0" \
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: \
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:"r" (bit) \
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:"memory");
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}
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#endif
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#ifdef __CC_ARM
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rt_inline rt_uint32_t cp15_rd(void)
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{
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rt_uint32_t i;
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__asm
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{
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mrc p15, 0, i, c1, c0, 0
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}
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return i;
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}
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rt_inline void cache_enable(rt_uint32_t bit)
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{
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rt_uint32_t value;
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__asm
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{
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mrc p15, 0, value, c1, c0, 0
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orr value, value, bit
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mcr p15, 0, value, c1, c0, 0
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}
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}
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rt_inline void cache_disable(rt_uint32_t bit)
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{
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rt_uint32_t value;
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__asm
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{
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mrc p15, 0, value, c1, c0, 0
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bic value, value, bit
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mcr p15, 0, value, c1, c0, 0
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}
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}
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#endif
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/**
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* enable I-Cache
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*
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*/
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void rt_hw_cpu_icache_enable()
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{
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cache_enable(ICACHE_MASK);
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}
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/**
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* disable I-Cache
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*
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*/
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void rt_hw_cpu_icache_disable()
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{
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cache_disable(ICACHE_MASK);
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}
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/**
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* return the status of I-Cache
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*
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*/
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rt_base_t rt_hw_cpu_icache_status()
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{
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return (cp15_rd() & ICACHE_MASK);
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}
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/**
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* enable D-Cache
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*
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*/
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void rt_hw_cpu_dcache_enable()
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{
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cache_enable(DCACHE_MASK);
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}
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/**
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* disable D-Cache
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*
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*/
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void rt_hw_cpu_dcache_disable()
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{
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cache_disable(DCACHE_MASK);
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}
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/**
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* return the status of D-Cache
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*
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*/
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rt_base_t rt_hw_cpu_dcache_status()
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{
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return (cp15_rd() & DCACHE_MASK);
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}
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static void at91sam9260_reset(void)
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{
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at91_sys_write(AT91_RSTC_CR, AT91_RSTC_KEY | AT91_RSTC_PROCRST | AT91_RSTC_PERRST);
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}
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static void at91sam9260_poweroff(void)
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{
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at91_sys_write(AT91_SHDW_CR, AT91_SHDW_KEY | AT91_SHDW_SHDW);
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}
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/**
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* reset cpu by dog's time-out
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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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rt_kprintf("Restarting system...\n");
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at91sam9260_reset();
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while(1); /* loop forever and wait for reset to happen */
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/* NEVER REACHED */
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}
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/**
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* 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_uint32_t level;
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rt_kprintf("shutdown...\n");
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level = rt_hw_interrupt_disable();
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at91sam9260_poweroff();
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while (level)
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{
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RT_ASSERT(0);
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}
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}
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/*@}*/
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