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 * 2006-03-13 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 <sep4020.h>
15
16 #define MAX_HANDLERS 32
17
18 extern rt_uint32_t rt_interrupt_nest;
19
20 /* exception and interrupt handler table */
21 struct rt_irq_desc isr_table[MAX_HANDLERS];
22 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
23 rt_uint32_t rt_thread_switch_interrupt_flag;
24
25 /**
26 * @addtogroup S3C24X0
27 */
28 /*@{*/
29
rt_hw_interrupt_handle(int vector,void * param)30 static void rt_hw_interrupt_handle(int vector, void *param)
31 {
32 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
33 }
34
35 /**
36 * This function will initialize hardware interrupt
37 */
rt_hw_interrupt_init(void)38 void rt_hw_interrupt_init(void)
39 {
40 register rt_uint32_t idx;
41
42 /*Make sure all intc registers in proper state*/
43
44 /*mask all the irq*/
45 *(RP)(INTC_IMR) = 0xFFFFFFFF;
46
47 /*enable all the irq*/
48 *(RP)(INTC_IER) = 0XFFFFFFFF;
49
50 /*Dont use any forced irq*/
51 *(RP)(INTC_IFR) = 0x0;
52
53 /*Disable all the fiq*/
54 *(RP)(INTC_FIER) = 0x0;
55
56 /*Mask all the fiq*/
57 *(RP)(INTC_FIMR) = 0x0F;
58
59 /*Dont use forced fiq*/
60 *(RP)(INTC_FIFR) = 0x0;
61
62 /*Intrrupt priority register*/
63 *(RP)(INTC_IPLR) = 0x0;
64
65 /* init exceptions table */
66 rt_memset(isr_table, 0x00, sizeof(isr_table));
67 for(idx=0; idx < MAX_HANDLERS; idx++)
68 {
69 isr_table[idx].handler = rt_hw_interrupt_handle;
70 }
71
72 /* init interrupt nest, and context in thread sp */
73 rt_interrupt_nest = 0;
74 rt_interrupt_from_thread = 0;
75 rt_interrupt_to_thread = 0;
76 rt_thread_switch_interrupt_flag = 0;
77 }
78
79 /**
80 * This function will mask a interrupt.
81 * @param vector the interrupt number
82 */
rt_hw_interrupt_mask(int vector)83 void rt_hw_interrupt_mask(int vector)
84 {
85 *(RP)(INTC_IMR) |= 1 << vector;
86 }
87
88 /**
89 * This function will un-mask a interrupt.
90 * @param vector the interrupt number
91 */
rt_hw_interrupt_umask(int vector)92 void rt_hw_interrupt_umask(int vector)
93 {
94 if(vector == 16)
95 {
96 rt_kprintf("Interrupt vec %d is not used!\n", vector);
97 }
98 else
99 *(RP)(INTC_IMR) &= ~(1 << vector);
100 }
101
102
103 /**
104 * This function will install a interrupt service routine to a interrupt.
105 * @param vector the interrupt number
106 * @param new_handler the interrupt service routine to be installed
107 * @param old_handler the old interrupt service routine
108 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)109 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
110 void *param, const char *name)
111 {
112 rt_isr_handler_t old_handler = RT_NULL;
113
114 if(vector < MAX_HANDLERS)
115 {
116 old_handler = isr_table[vector].handler;
117
118 if (handler != RT_NULL)
119 {
120 #ifdef RT_USING_INTERRUPT_INFO
121 rt_strncpy(isr_table[vector].name, name, RT_NAME_MAX);
122 #endif /* RT_USING_INTERRUPT_INFO */
123 isr_table[vector].handler = handler;
124 isr_table[vector].param = param;
125 }
126 }
127
128 return old_handler;
129 }
130
131 /*@}*/
132