board.c

/*
 * File      : board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 */

#include <interrupt.h>
#include <rthw.h>

#include <board.h>
#include <platform.h>
#include <encoding.h>
#include <interrupt.h>

extern void use_default_clocks(void);
extern void use_pll(int refsel, int bypass, int r, int f, int q);

#define TICK_COUNT  (2 * RTC_FREQ / RT_TICK_PER_SECOND)

#define MTIME       (*((volatile uint64_t *)(CLINT_CTRL_ADDR + CLINT_MTIME)))
#define MTIMECMP    (*((volatile uint64_t *)(CLINT_CTRL_ADDR + CLINT_MTIMECMP)))

/* system tick interrupt */
void handle_m_time_interrupt()
{
    MTIMECMP = MTIME + TICK_COUNT;
    rt_tick_increase();
}

/* fixed misaligned bug for qemu */
void *__wrap_memset(void *s, int c, size_t n)
{
    return rt_memset(s, c, n);
}

static void rt_hw_clock_init(void)
{
    use_default_clocks();
    use_pll(0, 0, 1, 31, 1);
}

static void rt_hw_timer_init(void)
{
    MTIMECMP = MTIME + TICK_COUNT;

    /*  enable timer interrupt*/
    set_csr(mie, MIP_MTIP);
}

void rt_hw_board_init(void)
{
    /* initialize the system clock */
    rt_hw_clock_init();

    /* initialize hardware interrupt */
    rt_hw_interrupt_init();

    /* initialize timer0 */
    rt_hw_timer_init();

#ifdef RT_USING_HEAP
    rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif

#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

#ifdef RT_USING_CONSOLE
    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif

    return;
}