Gitiles
Code Review Sign In
192.168.1.100 / T108 / e958203796650e3959a43708d67534bf36f4c83b / . / marvell / uboot / arch / x86 / lib / interrupts.c
blob: 6bb22d25e8d8edd69f880abb2469ed6b6232e750 [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame^]1/*
2 * (C) Copyright 2009
3 * Graeme Russ, <graeme.russ@gmail.com>
4 *
5 * (C) Copyright 2007
6 * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
7 *
8 * (C) Copyright 2006
9 * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
10 *
11 * (C) Copyright -2003
12 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
13 *
14 * (C) Copyright 2002
15 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
16 *
17 * (C) Copyright 2001
18 * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
19 *
20 * SPDX-License-Identifier: GPL-2.0+
21 */
22
23/*
24 * This file contains the high-level API for the interrupt sub-system
25 * of the x86 port of U-Boot. Most of the functionality has been
26 * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
27 * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
28 * credited for the corresponding work on those ports. The original
29 * interrupt handling routines for the x86 port were written by
30 * Daniel Engström
31 */
32
33#include <common.h>
34#include <asm/interrupt.h>
35
36struct irq_action {
37 interrupt_handler_t *handler;
38 void *arg;
39 unsigned int count;
40};
41
42static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
43static int spurious_irq_cnt;
44static int spurious_irq;
45
46void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
47{
48 int status;
49
50 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
51 printf("irq_install_handler: bad irq number %d\n", irq);
52 return;
53 }
54
55 if (irq_handlers[irq].handler != NULL)
56 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
57 (ulong) handler,
58 (ulong) irq_handlers[irq].handler);
59
60 status = disable_interrupts();
61
62 irq_handlers[irq].handler = handler;
63 irq_handlers[irq].arg = arg;
64 irq_handlers[irq].count = 0;
65
66 unmask_irq(irq);
67
68 if (status)
69 enable_interrupts();
70
71 return;
72}
73
74void irq_free_handler(int irq)
75{
76 int status;
77
78 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
79 printf("irq_free_handler: bad irq number %d\n", irq);
80 return;
81 }
82
83 status = disable_interrupts();
84
85 mask_irq(irq);
86
87 irq_handlers[irq].handler = NULL;
88 irq_handlers[irq].arg = NULL;
89
90 if (status)
91 enable_interrupts();
92
93 return;
94}
95
96void do_irq(int hw_irq)
97{
98 int irq = hw_irq - 0x20;
99
100 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
101 printf("do_irq: bad irq number %d\n", irq);
102 return;
103 }
104
105 if (irq_handlers[irq].handler) {
106 mask_irq(irq);
107
108 irq_handlers[irq].handler(irq_handlers[irq].arg);
109 irq_handlers[irq].count++;
110
111 unmask_irq(irq);
112 specific_eoi(irq);
113
114 } else {
115 if ((irq & 7) != 7) {
116 spurious_irq_cnt++;
117 spurious_irq = irq;
118 }
119 }
120}
121
122#if defined(CONFIG_CMD_IRQ)
123int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
124{
125 int irq;
126
127 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
128 spurious_irq_cnt, spurious_irq);
129
130 printf("Interrupt-Information:\n");
131 printf("Nr Routine Arg Count\n");
132
133 for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
134 if (irq_handlers[irq].handler != NULL) {
135 printf("%02d %08lx %08lx %d\n",
136 irq,
137 (ulong)irq_handlers[irq].handler,
138 (ulong)irq_handlers[irq].arg,
139 irq_handlers[irq].count);
140 }
141 }
142
143 return 0;
144}
145#endif