1 /*
2 * Copyright (c) 2006-2018, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2012-11-20 Bernard the first version
9 */
10
11 #include <rthw.h>
12 #include <rtthread.h>
13
14 #include "board.h"
15
16 #include <registers/regsarmglobaltimer.h>
17 #include <registers/regsepit.h>
18
19 #include <imx_uart.h>
20 #include <epit.h>
21 #include <cortex_a.h>
22
23 #include <mmu.h>
24
25 struct mem_desc platform_mem_desc[] = {
26 {0x00000000, 0x80000000, 0x00000000, DEVICE_MEM},
27 {0x80000000, 0xFFF00000, 0x80000000, NORMAL_MEM}
28 };
29
30 const rt_uint32_t platform_mem_desc_size = sizeof(platform_mem_desc)/sizeof(platform_mem_desc[0]);
31
rt_hw_timer_isr(int vector,void * param)32 static void rt_hw_timer_isr(int vector, void *param)
33 {
34 rt_tick_increase();
35 epit_get_compare_event(HW_EPIT1);
36 }
37
rt_hw_timer_init(void)38 int rt_hw_timer_init(void)
39 {
40 uint32_t freq;
41
42 // Make sure the timer is off.
43 HW_ARMGLOBALTIMER_CONTROL.B.TIMER_ENABLE = 0;
44
45 HW_ARMGLOBALTIMER_CONTROL.B.FCR0 =1;
46
47 HW_ARMGLOBALTIMER_CONTROL.B.FCR1 =0;
48
49 HW_ARMGLOBALTIMER_CONTROL.B.DBG_ENABLE =0;
50
51 // Clear counter.
52 HW_ARMGLOBALTIMER_COUNTER_HI_WR(0);
53 HW_ARMGLOBALTIMER_COUNTER_LO_WR(0);
54
55 // Now turn on the timer.
56 HW_ARMGLOBALTIMER_CONTROL.B.TIMER_ENABLE = 1;
57
58 freq = get_main_clock(IPG_CLK);
59
60 epit_init(HW_EPIT1, CLKSRC_IPG_CLK, freq / 1000000,
61 SET_AND_FORGET, 10000, WAIT_MODE_EN | STOP_MODE_EN);
62
63 epit_counter_enable(HW_EPIT1, 10000, IRQ_MODE);
64
65 rt_hw_interrupt_install(IMX_INT_EPIT1, rt_hw_timer_isr, RT_NULL, "tick");
66 rt_hw_interrupt_umask(IMX_INT_EPIT1);
67
68 return 0;
69 }
70 INIT_BOARD_EXPORT(rt_hw_timer_init);
71
72 /**
73 * This function will initialize hardware board
74 */
rt_hw_board_init(void)75 void rt_hw_board_init(void)
76 {
77 enable_neon_fpu();
78 disable_strict_align_check();
79
80 rt_components_board_init();
81 rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
82 }
83
84 /*@}*/
85