1 /*
2 * File : interrupt.c
3 * This file is part of RT-Thread RTOS
4 * COPYRIGHT (C) 2006 - 2011, RT-Thread Development Team
5 *
6 * The license and distribution terms for this file may be
7 * found in the file LICENSE in this distribution or at
8 * http://www.rt-thread.org/license/LICENSE
9 *
10 * Change Logs:
11 * Date Author Notes
12 * 2010-10-15 Bernard first version
13 * 2010-10-15 lgnq modified for LS1B
14 * 2013-03-29 aozima Modify the interrupt interface implementations.
15 */
16
17 #include <rtthread.h>
18 #include <rthw.h>
19 #include "ls1b.h"
20
21 #define MAX_INTR 32
22
23 extern rt_uint32_t rt_interrupt_nest;
24 rt_uint32_t rt_interrupt_from_thread;
25 rt_uint32_t rt_interrupt_to_thread;
26 rt_uint32_t rt_thread_switch_interrupt_flag;
27
28 static struct rt_irq_desc irq_handle_table[MAX_INTR];
29 void rt_interrupt_dispatch(void *ptreg);
30 void rt_hw_timer_handler();
31
32 static struct ls1b_intc_regs volatile *ls1b_hw0_icregs
33 = (struct ls1b_intc_regs volatile *)(LS1B_INTREG_BASE);
34
35 /**
36 * @addtogroup Loongson LS1B
37 */
38
39 /*@{*/
40
rt_hw_interrupt_handler(int vector,void * param)41 static void rt_hw_interrupt_handler(int vector, void *param)
42 {
43 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
44 }
45
46 /**
47 * This function will initialize hardware interrupt
48 */
rt_hw_interrupt_init(void)49 void rt_hw_interrupt_init(void)
50 {
51 rt_int32_t idx;
52
53 /* pci active low */
54 ls1b_hw0_icregs->int_pol = -1; //must be done here 20110802 lgnq
55 /* make all interrupts level triggered */
56 (ls1b_hw0_icregs+0)->int_edge = 0x0000e000;
57 /* mask all interrupts */
58 (ls1b_hw0_icregs+0)->int_clr = 0xffffffff;
59
60 rt_memset(irq_handle_table, 0x00, sizeof(irq_handle_table));
61 for (idx = 0; idx < MAX_INTR; idx ++)
62 {
63 irq_handle_table[idx].handler = rt_hw_interrupt_handler;
64 }
65
66 /* init interrupt nest, and context in thread sp */
67 rt_interrupt_nest = 0;
68 rt_interrupt_from_thread = 0;
69 rt_interrupt_to_thread = 0;
70 rt_thread_switch_interrupt_flag = 0;
71 }
72
73 /**
74 * This function will mask a interrupt.
75 * @param vector the interrupt number
76 */
rt_hw_interrupt_mask(int vector)77 void rt_hw_interrupt_mask(int vector)
78 {
79 /* mask interrupt */
80 (ls1b_hw0_icregs+(vector>>5))->int_en &= ~(1 << (vector&0x1f));
81 }
82
83 /**
84 * This function will un-mask a interrupt.
85 * @param vector the interrupt number
86 */
rt_hw_interrupt_umask(int vector)87 void rt_hw_interrupt_umask(int vector)
88 {
89 (ls1b_hw0_icregs+(vector>>5))->int_en |= (1 << (vector&0x1f));
90 }
91
92 /**
93 * This function will install a interrupt service routine to a interrupt.
94 * @param vector the interrupt number
95 * @param new_handler the interrupt service routine to be installed
96 * @param old_handler the old interrupt service routine
97 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)98 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
99 void *param, const char *name)
100 {
101 rt_isr_handler_t old_handler = RT_NULL;
102
103 if (vector >= 0 && vector < MAX_INTR)
104 {
105 old_handler = irq_handle_table[vector].handler;
106
107 #ifdef RT_USING_INTERRUPT_INFO
108 rt_strncpy(irq_handle_table[vector].name, name, RT_NAME_MAX);
109 #endif /* RT_USING_INTERRUPT_INFO */
110 irq_handle_table[vector].handler = handler;
111 irq_handle_table[vector].param = param;
112 }
113
114 return old_handler;
115 }
116
rt_interrupt_dispatch(void * ptreg)117 void rt_interrupt_dispatch(void *ptreg)
118 {
119 int irq;
120 void *param;
121 rt_isr_handler_t irq_func;
122 static rt_uint32_t status = 0;
123 rt_uint32_t c0_status;
124 rt_uint32_t c0_cause;
125 volatile rt_uint32_t cause_im;
126 volatile rt_uint32_t status_im;
127 rt_uint32_t pending_im;
128
129 /* check os timer */
130 c0_status = read_c0_status();
131 c0_cause = read_c0_cause();
132
133 cause_im = c0_cause & ST0_IM;
134 status_im = c0_status & ST0_IM;
135 pending_im = cause_im & status_im;
136
137 if (pending_im & CAUSEF_IP7)
138 {
139 rt_hw_timer_handler();
140 }
141
142 if (pending_im & CAUSEF_IP2)
143 {
144 /* the hardware interrupt */
145 status = ls1b_hw0_icregs->int_isr;
146 if (!status)
147 return;
148
149 for (irq = MAX_INTR; irq > 0; --irq)
150 {
151 if ((status & (1 << irq)))
152 {
153 status &= ~(1 << irq);
154
155 irq_func = irq_handle_table[irq].handler;
156 param = irq_handle_table[irq].param;
157
158 /* do interrupt */
159 irq_func(irq, param);
160
161 #ifdef RT_USING_INTERRUPT_INFO
162 irq_handle_table[irq].counter++;
163 #endif /* RT_USING_INTERRUPT_INFO */
164
165 /* ack interrupt */
166 ls1b_hw0_icregs->int_clr |= (1 << irq);
167 }
168 }
169 }
170 else if (pending_im & CAUSEF_IP3)
171 {
172 rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
173 }
174 else if (pending_im & CAUSEF_IP4)
175 {
176 rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
177 }
178 else if (pending_im & CAUSEF_IP5)
179 {
180 rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
181 }
182 else if (pending_im & CAUSEF_IP6)
183 {
184 rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
185 }
186 }
187
188 /*@}*/
189