1 /*
2 * COPYRIGHT (C) 2013-2014, Shanghai Real-Thread Technology Co., Ltd
3 *
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21 #include <rthw.h>
22 #include <rtthread.h>
23 #include "zynq7000.h"
24 #include "cp15.h"
25 #include "gic.h"
26
27 #define MAX_HANDLERS IRQ_Zynq7000_MAXNR
28
29 extern volatile rt_uint8_t rt_interrupt_nest;
30
31 /* exception and interrupt handler table */
32 struct rt_irq_desc isr_table[MAX_HANDLERS];
33 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
34 rt_uint32_t rt_thread_switch_interrupt_flag;
35
rt_hw_interrupt_handle(int vector,void * param)36 static void rt_hw_interrupt_handle(int vector, void *param)
37 {
38 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
39 }
40
41 const unsigned int VECTOR_BASE = 0x00;
42 extern int system_vectors;
43
rt_hw_vector_init(void)44 static void rt_hw_vector_init(void)
45 {
46 int sctrl;
47 unsigned int *src = (unsigned int *)&system_vectors;
48
49 /* C12-C0 is only active when SCTLR.V = 0 */
50 asm volatile ("mrc p15, #0, %0, c1, c0, #0"
51 :"=r" (sctrl));
52 sctrl &= ~(1 << 13);
53 asm volatile ("mcr p15, #0, %0, c1, c0, #0"
54 :
55 :"r" (sctrl));
56
57 asm volatile ("mcr p15, #0, %0, c12, c0, #0"
58 :
59 :"r" (src));
60 }
61
62 /**
63 * This function will initialize hardware interrupt
64 */
rt_hw_interrupt_init(void)65 void rt_hw_interrupt_init(void)
66 {
67 register rt_uint32_t idx;
68
69 /* set vector table */
70 rt_hw_vector_init();
71
72 /* init exceptions table */
73 rt_memset(isr_table, 0x00, sizeof(isr_table));
74 for (idx = 0; idx < MAX_HANDLERS; idx++)
75 {
76 isr_table[idx].handler = rt_hw_interrupt_handle;
77 }
78
79 /* initialize ARM GIC */
80 arm_gic_dist_init(0, Zynq7000_GIC_DIST_BASE, 0);
81 arm_gic_cpu_init(0, Zynq7000_GIC_CPU_BASE);
82
83 /* init interrupt nest, and context in thread sp */
84 rt_interrupt_nest = 0;
85 rt_interrupt_from_thread = 0;
86 rt_interrupt_to_thread = 0;
87 rt_thread_switch_interrupt_flag = 0;
88 }
89
90 /**
91 * This function will mask a interrupt.
92 * @param vector the interrupt number
93 */
rt_hw_interrupt_mask(int vector)94 void rt_hw_interrupt_mask(int vector)
95 {
96 arm_gic_mask(0, vector);
97 }
98
99 /**
100 * This function will un-mask a interrupt.
101 * @param vector the interrupt number
102 */
rt_hw_interrupt_umask(int vector)103 void rt_hw_interrupt_umask(int vector)
104 {
105 arm_gic_umask(0, vector);
106 }
107
108 /**
109 * This function will install a interrupt service routine to a interrupt.
110 * @param vector the interrupt number
111 * @param new_handler the interrupt service routine to be installed
112 * @param old_handler the old interrupt service routine
113 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)114 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
115 void *param, const char *name)
116 {
117 rt_isr_handler_t old_handler = RT_NULL;
118
119 if (vector < MAX_HANDLERS)
120 {
121 old_handler = isr_table[vector].handler;
122
123 if (handler != RT_NULL)
124 {
125 #ifdef RT_USING_INTERRUPT_INFO
126 rt_strncpy(isr_table[vector].name, name, RT_NAME_MAX);
127 #endif /* RT_USING_INTERRUPT_INFO */
128 isr_table[vector].handler = handler;
129 isr_table[vector].param = param;
130 }
131 /* set the interrupt to this cpu */
132 arm_gic_set_cpu(0, vector, 1 << rt_cpu_get_smp_id());
133 }
134
135 return old_handler;
136 }
137
rt_hw_interrupt_clear(int vector)138 void rt_hw_interrupt_clear(int vector)
139 {
140 /* SGI will be cleared automatically. */
141 if (vector < 16)
142 return;
143 }
144