1 /*
2 * File : board.c
3 * This file is part of RT-Thread RTOS
4 * COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Change Logs:
21 * Date Author Notes
22 */
23
24 #include <interrupt.h>
25 #include <rthw.h>
26
27 #include <board.h>
28 #include <platform.h>
29 #include <encoding.h>
30 #include <interrupt.h>
31
32 extern void use_default_clocks(void);
33 extern void use_pll(int refsel, int bypass, int r, int f, int q);
34
35 #define TICK_COUNT (RTC_FREQ / RT_TICK_PER_SECOND)
36
37 #define MTIME (*((volatile uint64_t *)(CLINT_CTRL_ADDR + CLINT_MTIME)))
38 #define MTIMECMP (*((volatile uint64_t *)(CLINT_CTRL_ADDR + CLINT_MTIMECMP)))
39
40 /* system tick interrupt */
handle_m_time_interrupt()41 void handle_m_time_interrupt()
42 {
43 MTIMECMP = MTIME + TICK_COUNT;
44 rt_tick_increase();
45 }
46
47 /* fixed misaligned bug for qemu */
__wrap_memset(void * s,int c,size_t n)48 void *__wrap_memset(void *s, int c, size_t n)
49 {
50 return rt_memset(s, c, n);
51 }
52
rt_hw_clock_init(void)53 static void rt_hw_clock_init(void)
54 {
55 use_default_clocks();
56 use_pll(0, 0, 1, 31, 1);
57 }
58
rt_hw_timer_init(void)59 static void rt_hw_timer_init(void)
60 {
61 MTIMECMP = MTIME + TICK_COUNT;
62
63 /* enable timer interrupt*/
64 set_csr(mie, MIP_MTIP);
65 }
66
rt_hw_board_init(void)67 void rt_hw_board_init(void)
68 {
69 /* initialize the system clock */
70 rt_hw_clock_init();
71
72 /* initialize hardware interrupt */
73 rt_hw_interrupt_init();
74
75 /* initialize timer0 */
76 rt_hw_timer_init();
77
78 #ifdef RT_USING_HEAP
79 rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
80 #endif
81
82 #ifdef RT_USING_COMPONENTS_INIT
83 rt_components_board_init();
84 #endif
85
86 #ifdef RT_USING_CONSOLE
87 rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
88 #endif
89
90 return;
91 }
92
93