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 Engstr��m, 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 Engstr��m
30 */
31
32#include <common.h>
33#include <command.h>
34#include <irq_func.h>
35#include <asm/interrupt.h>
36
37#if !CONFIG_IS_ENABLED(X86_64)
38
39struct irq_action {
40	interrupt_handler_t *handler;
41	void *arg;
42	unsigned int count;
43};
44
45static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
46static int spurious_irq_cnt;
47static int spurious_irq;
48
49void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
50{
51	int status;
52
53	if (irq < 0 || irq >= SYS_NUM_IRQS) {
54		printf("irq_install_handler: bad irq number %d\n", irq);
55		return;
56	}
57
58	if (irq_handlers[irq].handler != NULL)
59		printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
60				(ulong) handler,
61				(ulong) irq_handlers[irq].handler);
62
63	status = disable_interrupts();
64
65	irq_handlers[irq].handler = handler;
66	irq_handlers[irq].arg = arg;
67	irq_handlers[irq].count = 0;
68
69	if (CONFIG_IS_ENABLED(I8259_PIC))
70		unmask_irq(irq);
71
72	if (status)
73		enable_interrupts();
74
75	return;
76}
77
78void irq_free_handler(int irq)
79{
80	int status;
81
82	if (irq < 0 || irq >= SYS_NUM_IRQS) {
83		printf("irq_free_handler: bad irq number %d\n", irq);
84		return;
85	}
86
87	status = disable_interrupts();
88
89	if (CONFIG_IS_ENABLED(I8259_PIC))
90		mask_irq(irq);
91
92	irq_handlers[irq].handler = NULL;
93	irq_handlers[irq].arg = NULL;
94
95	if (status)
96		enable_interrupts();
97
98	return;
99}
100
101void do_irq(int hw_irq)
102{
103	int irq = hw_irq - 0x20;
104
105	if (irq < 0 || irq >= SYS_NUM_IRQS) {
106		printf("do_irq: bad irq number %d\n", irq);
107		return;
108	}
109
110	if (irq_handlers[irq].handler) {
111		if (CONFIG_IS_ENABLED(I8259_PIC))
112			mask_irq(irq);
113
114		irq_handlers[irq].handler(irq_handlers[irq].arg);
115		irq_handlers[irq].count++;
116
117		if (CONFIG_IS_ENABLED(I8259_PIC)) {
118			unmask_irq(irq);
119			specific_eoi(irq);
120		}
121	} else {
122		if ((irq & 7) != 7) {
123			spurious_irq_cnt++;
124			spurious_irq = irq;
125		}
126	}
127}
128#endif
129
130#if defined(CONFIG_CMD_IRQ)
131int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
132{
133#if !CONFIG_IS_ENABLED(X86_64)
134	struct idt_ptr ptr;
135	int irq;
136
137	interrupt_read_idt(&ptr);
138	printf("IDT at %lx, size %x\n", ptr.address, ptr.size);
139	printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
140			spurious_irq_cnt, spurious_irq);
141
142	printf("Interrupt-Information:\n");
143	printf("Nr  Routine   Arg       Count\n");
144
145	for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
146		if (irq_handlers[irq].handler != NULL) {
147			printf("%02d  %08lx  %08lx  %d\n",
148					irq,
149					(ulong)irq_handlers[irq].handler,
150					(ulong)irq_handlers[irq].arg,
151					irq_handlers[irq].count);
152		}
153	}
154#endif
155
156	return 0;
157}
158#endif
159