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 <asm/interrupt.h>
34
35 #if !CONFIG_IS_ENABLED(X86_64)
36
37 struct irq_action {
38 interrupt_handler_t *handler;
39 void *arg;
40 unsigned int count;
41 };
42
43 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
44 static int spurious_irq_cnt;
45 static int spurious_irq;
46
irq_install_handler(int irq,interrupt_handler_t * handler,void * arg)47 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
48 {
49 int status;
50
51 if (irq < 0 || irq >= SYS_NUM_IRQS) {
52 printf("irq_install_handler: bad irq number %d\n", irq);
53 return;
54 }
55
56 if (irq_handlers[irq].handler != NULL)
57 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
58 (ulong) handler,
59 (ulong) irq_handlers[irq].handler);
60
61 status = disable_interrupts();
62
63 irq_handlers[irq].handler = handler;
64 irq_handlers[irq].arg = arg;
65 irq_handlers[irq].count = 0;
66
67 if (CONFIG_IS_ENABLED(I8259_PIC))
68 unmask_irq(irq);
69
70 if (status)
71 enable_interrupts();
72
73 return;
74 }
75
irq_free_handler(int irq)76 void irq_free_handler(int irq)
77 {
78 int status;
79
80 if (irq < 0 || irq >= SYS_NUM_IRQS) {
81 printf("irq_free_handler: bad irq number %d\n", irq);
82 return;
83 }
84
85 status = disable_interrupts();
86
87 if (CONFIG_IS_ENABLED(I8259_PIC))
88 mask_irq(irq);
89
90 irq_handlers[irq].handler = NULL;
91 irq_handlers[irq].arg = NULL;
92
93 if (status)
94 enable_interrupts();
95
96 return;
97 }
98
do_irq(int hw_irq)99 void do_irq(int hw_irq)
100 {
101 int irq = hw_irq - 0x20;
102
103 if (irq < 0 || irq >= SYS_NUM_IRQS) {
104 printf("do_irq: bad irq number %d\n", irq);
105 return;
106 }
107
108 if (irq_handlers[irq].handler) {
109 if (CONFIG_IS_ENABLED(I8259_PIC))
110 mask_irq(irq);
111
112 irq_handlers[irq].handler(irq_handlers[irq].arg);
113 irq_handlers[irq].count++;
114
115 if (CONFIG_IS_ENABLED(I8259_PIC)) {
116 unmask_irq(irq);
117 specific_eoi(irq);
118 }
119 } else {
120 if ((irq & 7) != 7) {
121 spurious_irq_cnt++;
122 spurious_irq = irq;
123 }
124 }
125 }
126 #endif
127
128 #if defined(CONFIG_CMD_IRQ)
do_irqinfo(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])129 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
130 {
131 #if !CONFIG_IS_ENABLED(X86_64)
132 int irq;
133
134 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
135 spurious_irq_cnt, spurious_irq);
136
137 printf("Interrupt-Information:\n");
138 printf("Nr Routine Arg Count\n");
139
140 for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
141 if (irq_handlers[irq].handler != NULL) {
142 printf("%02d %08lx %08lx %d\n",
143 irq,
144 (ulong)irq_handlers[irq].handler,
145 (ulong)irq_handlers[irq].arg,
146 irq_handlers[irq].count);
147 }
148 }
149 #endif
150
151 return 0;
152 }
153 #endif
154