1 // SPDX-License-Identifier: GPL-2.0+
4 * Graeme Russ, <graeme.russ@gmail.com>
7 * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
10 * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
13 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
16 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
19 * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
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
33 #include <asm/interrupt.h>
35 #if !CONFIG_IS_ENABLED(X86_64)
38 interrupt_handler_t *handler;
43 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
44 static int spurious_irq_cnt;
45 static int spurious_irq;
47 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
51 if (irq < 0 || irq >= SYS_NUM_IRQS) {
52 printf("irq_install_handler: bad irq number %d\n", irq);
56 if (irq_handlers[irq].handler != NULL)
57 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
59 (ulong) irq_handlers[irq].handler);
61 status = disable_interrupts();
63 irq_handlers[irq].handler = handler;
64 irq_handlers[irq].arg = arg;
65 irq_handlers[irq].count = 0;
75 void irq_free_handler(int irq)
79 if (irq < 0 || irq >= SYS_NUM_IRQS) {
80 printf("irq_free_handler: bad irq number %d\n", irq);
84 status = disable_interrupts();
88 irq_handlers[irq].handler = NULL;
89 irq_handlers[irq].arg = NULL;
97 void do_irq(int hw_irq)
99 int irq = hw_irq - 0x20;
101 if (irq < 0 || irq >= SYS_NUM_IRQS) {
102 printf("do_irq: bad irq number %d\n", irq);
106 if (irq_handlers[irq].handler) {
109 irq_handlers[irq].handler(irq_handlers[irq].arg);
110 irq_handlers[irq].count++;
116 if ((irq & 7) != 7) {
124 #if defined(CONFIG_CMD_IRQ)
125 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
127 #if !CONFIG_IS_ENABLED(X86_64)
130 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
131 spurious_irq_cnt, spurious_irq);
133 printf("Interrupt-Information:\n");
134 printf("Nr Routine Arg Count\n");
136 for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
137 if (irq_handlers[irq].handler != NULL) {
138 printf("%02d %08lx %08lx %d\n",
140 (ulong)irq_handlers[irq].handler,
141 (ulong)irq_handlers[irq].arg,
142 irq_handlers[irq].count);