92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* File : board.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2012, 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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* 2012-11-20 Bernard the first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "board.h"
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#define TIMER_LOAD(hw_base) __REG32(hw_base + 0x00)
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#define TIMER_VALUE(hw_base) __REG32(hw_base + 0x04)
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#define TIMER_CTRL(hw_base) __REG32(hw_base + 0x08)
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#define TIMER_CTRL_ONESHOT (1 << 0)
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#define TIMER_CTRL_32BIT (1 << 1)
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#define TIMER_CTRL_DIV1 (0 << 2)
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#define TIMER_CTRL_DIV16 (1 << 2)
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#define TIMER_CTRL_DIV256 (2 << 2)
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#define TIMER_CTRL_IE (1 << 5) /* Interrupt Enable (versatile only) */
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#define TIMER_CTRL_PERIODIC (1 << 6)
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#define TIMER_CTRL_ENABLE (1 << 7)
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#define TIMER_INTCLR(hw_base) __REG32(hw_base + 0x0c)
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#define TIMER_RIS(hw_base) __REG32(hw_base + 0x10)
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#define TIMER_MIS(hw_base) __REG32(hw_base + 0x14)
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#define TIMER_BGLOAD(hw_base) __REG32(hw_base + 0x18)
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#define SYS_CTRL __REG32(REALVIEW_SCTL_BASE)
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#define TIMER_HW_BASE REALVIEW_TIMER2_3_BASE
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static void rt_hw_timer_isr(int vector, void *param)
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{
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rt_tick_increase();
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/* clear interrupt */
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TIMER_INTCLR(TIMER_HW_BASE) = 0x01;
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}
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int rt_hw_timer_init(void)
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{
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rt_uint32_t val;
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SYS_CTRL |= REALVIEW_REFCLK;
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/* Setup Timer0 for generating irq */
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val = TIMER_CTRL(TIMER_HW_BASE);
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val &= ~TIMER_CTRL_ENABLE;
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val |= (TIMER_CTRL_32BIT | TIMER_CTRL_PERIODIC | TIMER_CTRL_IE);
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TIMER_CTRL(TIMER_HW_BASE) = val;
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TIMER_LOAD(TIMER_HW_BASE) = 1000;
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/* enable timer */
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TIMER_CTRL(TIMER_HW_BASE) |= TIMER_CTRL_ENABLE;
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rt_hw_interrupt_install(IRQ_PBA8_TIMER2_3, rt_hw_timer_isr, RT_NULL, "tick");
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rt_hw_interrupt_umask(IRQ_PBA8_TIMER2_3);
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return 0;
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}
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INIT_BOARD_EXPORT(rt_hw_timer_init);
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void idle_wfi(void)
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{
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asm volatile ("wfi");
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}
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/**
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* This function will initialize beaglebone board
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*/
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void rt_hw_board_init(void)
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{
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/* initialzie hardware interrupt */
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rt_hw_interrupt_init();
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rt_system_heap_init(HEAP_BEGIN, HEAP_END);
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rt_components_board_init();
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rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
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rt_thread_idle_sethook(idle_wfi);
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}
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