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 * 2006-08-23 Bernard first version
9 * 2013-03-29 aozima Modify the interrupt interface implementations.
10 */
11
12 #include <rtthread.h>
13 #include <rthw.h>
14 #include "AT91SAM7X256.h"
15
16 #define MAX_HANDLERS 32
17
18 /* exception and interrupt handler table */
19 struct rt_irq_desc irq_desc[MAX_HANDLERS];
20
21 extern rt_uint32_t rt_interrupt_nest;
22
23 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
24 rt_uint32_t rt_thread_switch_interrupt_flag;
25
26 /**
27 * @addtogroup AT91SAM7
28 */
29 /*@{*/
30
rt_hw_interrupt_handler(int vector,void * param)31 static void rt_hw_interrupt_handler(int vector, void *param)
32 {
33 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
34 }
35
36 /**
37 * This function will initialize hardware interrupt
38 */
rt_hw_interrupt_init(void)39 void rt_hw_interrupt_init(void)
40 {
41 rt_base_t index;
42
43 /* init exceptions table */
44 for(index=0; index < MAX_HANDLERS; index++)
45 {
46 irq_desc[index].handler = (rt_isr_handler_t)rt_hw_interrupt_handler;
47 irq_desc[index].param = RT_NULL;
48 }
49
50 for (index = 0; index < MAX_HANDLERS; index ++)
51 {
52 AT91C_BASE_AIC->AIC_SVR[index] = (rt_uint32_t)rt_hw_interrupt_handler;
53 }
54
55 /* init interrupt nest, and context in thread sp */
56 rt_interrupt_nest = 0;
57 rt_interrupt_from_thread = 0;
58 rt_interrupt_to_thread = 0;
59 rt_thread_switch_interrupt_flag = 0;
60 }
61
62 /**
63 * This function will mask a interrupt.
64 * @param vector the interrupt number
65 */
rt_hw_interrupt_mask(int vector)66 void rt_hw_interrupt_mask(int vector)
67 {
68 /* disable interrupt */
69 AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
70
71 /* clear interrupt */
72 AT91C_BASE_AIC->AIC_ICCR = 1 << vector;
73 }
74
75 /**
76 * This function will un-mask a interrupt.
77 * @param vector the interrupt number
78 */
rt_hw_interrupt_umask(int vector)79 void rt_hw_interrupt_umask(int vector)
80 {
81 AT91C_BASE_AIC->AIC_IECR = 1 << vector;
82 }
83
84 /**
85 * This function will install a interrupt service routine to a interrupt.
86 * @param vector the interrupt number
87 * @param handler the interrupt service routine to be installed
88 * @param param the parameter for interrupt service routine
89 * @name unused.
90 *
91 * @return the old handler
92 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)93 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
94 void *param, const char *name)
95 {
96 rt_isr_handler_t old_handler = RT_NULL;
97 if(vector >= 0 && vector < MAX_HANDLERS)
98 {
99 old_handler = irq_desc[vector].handler;
100 if (handler != RT_NULL)
101 {
102 irq_desc[vector].handler = (rt_isr_handler_t)handler;
103 irq_desc[vector].param = param;
104 }
105 }
106
107 return old_handler;
108 }
109
110 /*@}*/
111