1 /*
2  * Copyright (c) 2021, Shenzhen Academy of Aerospace Technology
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Change Logs:
7  * Date           Author       Notes
8  * 2021-11-16     Dystopia     the first version
9  */
10 
11 #include "drv_timer.h"
12 #include "interrupt.h"
13 #include "common.h"
14 
15 #include <rthw.h>
16 #include <rtthread.h>
17 
18 /**
19  * This is the timer interrupt service routine.
20  *
21  */
rt_hw_systick_isr(void)22 void rt_hw_systick_isr(void)
23 {
24     /* enter interrupt */
25     rt_interrupt_enter();
26 
27     rt_tick_increase();
28 
29     /* leave interrupt */
30     rt_interrupt_leave();
31 }
32 
33 /**
34  * The function initial system timer interrupt.
35  */
rt_hw_system_timer_init(void)36 void rt_hw_system_timer_init(void)
37 {
38     // initial system timer interrupt, map local timer interrupt to INT14
39     gp_cgem_regs->INTMUX3 = (CSL_GEM_TINTLN << CSL_CGEM_INTMUX3_INTSEL14_SHIFT);
40     // enable CPU INT14
41     rt_hw_interrupt_umask(1 << 14);
42 
43     return ;
44 }
45 
46 /**
47  * The function initial system timer.
48  * Use local timer (== DNUM of a core) to generate a clock on TIMO0,interrupts are generated as well
49  *
50  */
rt_hw_system_timer_start(void)51 void rt_hw_system_timer_start(void)
52 {
53     Timer64_Config tmrCfg;
54 
55     // select output on TIMO0 from local timer.
56     gp_bootcfg_regs->TOUTSEL = (DNUM*2) << CSL_BOOTCFG_TOUTSEL_TOUTSEL0_SHIFT;
57 
58     // configure the timer to generate clocks and interrupts
59     tmrCfg.timer_num = DNUM;
60     tmrCfg.timerMode = TIMER_PERIODIC_CLOCK;
61     tmrCfg.period = (unsigned long long) RT_TICK_PER_SECOND * DSP_CORE_SPEED_HZ / 6000;
62     tmrCfg.reload_period = 0;
63 
64     // initial timer
65     timer64_init(&tmrCfg);
66 }
67