common: Move interrupt functions into a new header
[oweals/u-boot.git] / arch / x86 / lib / interrupts.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2009
4  * Graeme Russ, <graeme.russ@gmail.com>
5  *
6  * (C) Copyright 2007
7  * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
8  *
9  * (C) Copyright 2006
10  * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
11  *
12  * (C) Copyright -2003
13  * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
14  *
15  * (C) Copyright 2002
16  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
17  *
18  * (C) Copyright 2001
19  * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
20  */
21
22 /*
23  * This file contains the high-level API for the interrupt sub-system
24  * of the x86 port of U-Boot. Most of the functionality has been
25  * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
26  * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
27  * credited for the corresponding work on those ports. The original
28  * interrupt handling routines for the x86 port were written by
29  * Daniel Engström
30  */
31
32 #include <common.h>
33 #include <irq_func.h>
34 #include <asm/interrupt.h>
35
36 #if !CONFIG_IS_ENABLED(X86_64)
37
38 struct irq_action {
39         interrupt_handler_t *handler;
40         void *arg;
41         unsigned int count;
42 };
43
44 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
45 static int spurious_irq_cnt;
46 static int spurious_irq;
47
48 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
49 {
50         int status;
51
52         if (irq < 0 || irq >= SYS_NUM_IRQS) {
53                 printf("irq_install_handler: bad irq number %d\n", irq);
54                 return;
55         }
56
57         if (irq_handlers[irq].handler != NULL)
58                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
59                                 (ulong) handler,
60                                 (ulong) irq_handlers[irq].handler);
61
62         status = disable_interrupts();
63
64         irq_handlers[irq].handler = handler;
65         irq_handlers[irq].arg = arg;
66         irq_handlers[irq].count = 0;
67
68         if (CONFIG_IS_ENABLED(I8259_PIC))
69                 unmask_irq(irq);
70
71         if (status)
72                 enable_interrupts();
73
74         return;
75 }
76
77 void irq_free_handler(int irq)
78 {
79         int status;
80
81         if (irq < 0 || irq >= SYS_NUM_IRQS) {
82                 printf("irq_free_handler: bad irq number %d\n", irq);
83                 return;
84         }
85
86         status = disable_interrupts();
87
88         if (CONFIG_IS_ENABLED(I8259_PIC))
89                 mask_irq(irq);
90
91         irq_handlers[irq].handler = NULL;
92         irq_handlers[irq].arg = NULL;
93
94         if (status)
95                 enable_interrupts();
96
97         return;
98 }
99
100 void do_irq(int hw_irq)
101 {
102         int irq = hw_irq - 0x20;
103
104         if (irq < 0 || irq >= SYS_NUM_IRQS) {
105                 printf("do_irq: bad irq number %d\n", irq);
106                 return;
107         }
108
109         if (irq_handlers[irq].handler) {
110                 if (CONFIG_IS_ENABLED(I8259_PIC))
111                         mask_irq(irq);
112
113                 irq_handlers[irq].handler(irq_handlers[irq].arg);
114                 irq_handlers[irq].count++;
115
116                 if (CONFIG_IS_ENABLED(I8259_PIC)) {
117                         unmask_irq(irq);
118                         specific_eoi(irq);
119                 }
120         } else {
121                 if ((irq & 7) != 7) {
122                         spurious_irq_cnt++;
123                         spurious_irq = irq;
124                 }
125         }
126 }
127 #endif
128
129 #if defined(CONFIG_CMD_IRQ)
130 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
131 {
132 #if !CONFIG_IS_ENABLED(X86_64)
133         int irq;
134
135         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
136                         spurious_irq_cnt, spurious_irq);
137
138         printf("Interrupt-Information:\n");
139         printf("Nr  Routine   Arg       Count\n");
140
141         for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
142                 if (irq_handlers[irq].handler != NULL) {
143                         printf("%02d  %08lx  %08lx  %d\n",
144                                         irq,
145                                         (ulong)irq_handlers[irq].handler,
146                                         (ulong)irq_handlers[irq].arg,
147                                         irq_handlers[irq].count);
148                 }
149         }
150 #endif
151
152         return 0;
153 }
154 #endif