1 /*
2 * Interrupt handle for GS232
3 *
4 * Copyright (c) 2006-2021, RT-Thread Development Team
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 *
8 * Change Logs:
9 * Date Author Notes
10 * 2010-10-15 Bernard first version
11 * 2010-10-15 lgnq modified for LS1B
12 * 2013-03-29 aozima Modify the interrupt interface implementations.
13 * 2015-07-06 chinesebear modified for loongson 1c
14 * 2019-12-04 Jiaxun Yang Generialize
15 */
16
17 #include <rtthread.h>
18 #include <rthw.h>
19 #include "gs232.h"
20
21
22 #define MAX_INTR (GS232_NR_IRQS)
23
24 static struct rt_irq_desc irq_handle_table[MAX_INTR];
25 void rt_hw_timer_handler();
26
27 static struct gs232_intc_regs volatile *gs232_hw0_icregs
28 = (struct gs232_intc_regs volatile *)(INTC_BASE);
29
30 /**
31 * @addtogroup Loongson GS232
32 */
33
34 /*@{*/
35
rt_hw_interrupt_handler(int vector,void * param)36 static void rt_hw_interrupt_handler(int vector, void *param)
37 {
38 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
39 }
40
41 /**
42 * This function will initialize hardware interrupt
43 */
rt_hw_interrupt_init(void)44 void rt_hw_interrupt_init(void)
45 {
46 rt_int32_t idx;
47 rt_int32_t i;
48 rt_uint32_t c0_status = 0;
49
50 for (i=0; i < GS232_INTC_CELLS; i++)
51 {
52 /* Disable */
53 (gs232_hw0_icregs+i)->int_en = 0x0;
54 /* Trigger active low */
55 (gs232_hw0_icregs+i)->int_pol = -1; /* Must be done here */
56 /* Make all interrupts level triggered */
57 (gs232_hw0_icregs+i)->int_edge = 0x00000000;
58 /* Mask all interrupts */
59 (gs232_hw0_icregs+i)->int_clr = 0xffffffff;
60 mips_unmask_cpu_irq(i + 2);
61 }
62
63 rt_memset(irq_handle_table, 0x00, sizeof(irq_handle_table));
64 for (idx = 0; idx < MAX_INTR; idx ++)
65 {
66 irq_handle_table[idx].handler = rt_hw_interrupt_handler;
67 }
68 }
69
70 /**
71 * This function will mask a interrupt.
72 * @param vector the interrupt number
73 */
rt_hw_interrupt_mask(int vector)74 void rt_hw_interrupt_mask(int vector)
75 {
76 /* mask interrupt */
77 (gs232_hw0_icregs+(vector>>5))->int_en &= ~(1 << (vector&0x1f));
78 }
79
80 /**
81 * This function will un-mask a interrupt.
82 * @param vector the interrupt number
83 */
rt_hw_interrupt_umask(int vector)84 void rt_hw_interrupt_umask(int vector)
85 {
86 (gs232_hw0_icregs+(vector>>5))->int_en |= (1 << (vector&0x1f));
87 }
88
89 /**
90 * This function will install a interrupt service routine to a interrupt.
91 * @param vector the interrupt number
92 * @param new_handler the interrupt service routine to be installed
93 * @param old_handler the old interrupt service routine
94 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)95 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
96 void *param, const char *name)
97 {
98 rt_isr_handler_t old_handler = RT_NULL;
99
100 if (vector >= 0 && vector < MAX_INTR)
101 {
102 old_handler = irq_handle_table[vector].handler;
103
104 #ifdef RT_USING_INTERRUPT_INFO
105 rt_strncpy(irq_handle_table[vector].name, name, RT_NAME_MAX);
106 #endif /* RT_USING_INTERRUPT_INFO */
107 irq_handle_table[vector].handler = handler;
108 irq_handle_table[vector].param = param;
109 }
110
111 return old_handler;
112 }
113
114
115 /**
116 * Call ISR
117 * @IRQn ID of IRQ
118 */
gs232_do_IRQ(int IRQn)119 void gs232_do_IRQ(int IRQn)
120 {
121 rt_isr_handler_t irq_func;
122 void *param;
123
124 irq_func = irq_handle_table[IRQn].handler;
125 param = irq_handle_table[IRQn].param;
126
127 irq_func(IRQn, param);
128
129 #ifdef RT_USING_INTERRUPT_INFO
130 irq_handle_table[IRQn].counter++;
131 #endif
132
133 return ;
134 }
135
136
rt_do_mips_cpu_irq(rt_uint32_t ip)137 void rt_do_mips_cpu_irq(rt_uint32_t ip)
138 {
139 rt_uint32_t intstatus, irq, n;
140
141 if (ip == 7) {
142 rt_hw_timer_handler();
143 } else {
144 n = ip - 2;
145 /* Receive interrupt signal, compute the irq */
146 intstatus = (gs232_hw0_icregs+n)->int_isr & (gs232_hw0_icregs+n)->int_en;
147 if (0 == intstatus)
148 return ;
149
150 irq = __rt_ffs(intstatus) - 1;
151 gs232_do_IRQ((n<<5) + irq);
152
153 /* ack interrupt */
154 (gs232_hw0_icregs+n)->int_clr |= (1 << irq);
155 }
156 }
157
158
159 /*@}*/
160
161
162