rt-thread/bsp/realview-a8/drivers/board.c

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/*
* File : board.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2012, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2012-11-20 Bernard the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <components.h>
#include "board.h"
#define TIMER_LOAD(hw_base) __REG32(hw_base + 0x00)
#define TIMER_VALUE(hw_base) __REG32(hw_base + 0x04)
#define TIMER_CTRL(hw_base) __REG32(hw_base + 0x08)
#define TIMER_CTRL_ONESHOT (1 << 0)
#define TIMER_CTRL_32BIT (1 << 1)
#define TIMER_CTRL_DIV1 (0 << 2)
#define TIMER_CTRL_DIV16 (1 << 2)
#define TIMER_CTRL_DIV256 (2 << 2)
#define TIMER_CTRL_IE (1 << 5) /* Interrupt Enable (versatile only) */
#define TIMER_CTRL_PERIODIC (1 << 6)
#define TIMER_CTRL_ENABLE (1 << 7)
#define TIMER_INTCLR(hw_base) __REG32(hw_base + 0x0c)
#define TIMER_RIS(hw_base) __REG32(hw_base + 0x10)
#define TIMER_MIS(hw_base) __REG32(hw_base + 0x14)
#define TIMER_BGLOAD(hw_base) __REG32(hw_base + 0x18)
#define SYS_CTRL __REG32(REALVIEW_SCTL_BASE)
#ifdef RT_USING_VMM
#include <vmm.h>
static rt_uint32_t timer_hw_base = 0;
#define TIMER_HW_BASE (timer_hw_base)
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#else
#define TIMER_HW_BASE REALVIEW_TIMER2_3_BASE
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#endif
void rt_hw_timer_ack(void)
{
/* clear interrupt */
TIMER_INTCLR(TIMER_HW_BASE) = 0x01;
}
static void rt_hw_timer_isr(int vector, void *param)
{
rt_tick_increase();
rt_hw_timer_ack();
}
int rt_hw_timer_init(void)
{
rt_uint32_t val;
#ifdef RT_USING_VMM
{
rt_uint32_t sys_ctrl;
sys_ctrl = vmm_find_iomap("SYS_CTRL");
__REG32(sys_ctrl) |= REALVIEW_REFCLK;
}
timer_hw_base = vmm_find_iomap("TIMER");
#else
SYS_CTRL |= REALVIEW_REFCLK;
#endif
/* Setup Timer0 for generating irq */
val = TIMER_CTRL(TIMER_HW_BASE);
val &= ~TIMER_CTRL_ENABLE;
val |= (TIMER_CTRL_32BIT | TIMER_CTRL_PERIODIC | TIMER_CTRL_IE);
TIMER_CTRL(TIMER_HW_BASE) = val;
TIMER_LOAD(TIMER_HW_BASE) = 1000;
/* enable timer */
TIMER_CTRL(TIMER_HW_BASE) |= TIMER_CTRL_ENABLE;
rt_hw_interrupt_install(IRQ_PBA8_TIMER2_3, rt_hw_timer_isr, RT_NULL, "tick");
rt_hw_interrupt_umask(IRQ_PBA8_TIMER2_3);
return 0;
}
INIT_BOARD_EXPORT(rt_hw_timer_init);
/**
* This function will initialize beaglebone board
*/
void rt_hw_board_init(void)
{
rt_components_board_init();
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
}
/*@}*/