3 * Graeme Russ, graeme.russ@gmail.com
6 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
9 * Detlev Zundel, DENX Software Engineering, dzu@denx.de
12 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
18 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
20 * See file CREDITS for list of people who contributed to this
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public License as
25 * published by the Free Software Foundation; either version 2 of
26 * the License, or (at your option) any later version.
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 * GNU General Public License for more details.
33 * You should have received a copy of the GNU General Public License
34 * along with this program; if not, write to the Free Software
35 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
40 * This file contains the high-level API for the interrupt sub-system
41 * of the i386 port of U-Boot. Most of the functionality has been
42 * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
43 * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
44 * credited for the corresponding work on those ports. The original
45 * interrupt handling routines for the i386 port were written by
50 #include <asm/interrupt.h>
53 interrupt_handler_t *handler;
58 static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
59 static int spurious_irq_cnt = 0;
60 static int spurious_irq = 0;
62 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
66 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
67 printf("irq_install_handler: bad irq number %d\n", irq);
71 if (irq_handlers[irq].handler != NULL)
72 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
74 (ulong) irq_handlers[irq].handler);
76 status = disable_interrupts ();
78 irq_handlers[irq].handler = handler;
79 irq_handlers[irq].arg = arg;
80 irq_handlers[irq].count = 0;
90 void irq_free_handler(int irq)
94 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
95 printf("irq_free_handler: bad irq number %d\n", irq);
99 status = disable_interrupts ();
103 irq_handlers[irq].handler = NULL;
104 irq_handlers[irq].arg = NULL;
112 void do_irq(int hw_irq)
114 int irq = hw_irq - 0x20;
116 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
117 printf("do_irq: bad irq number %d\n", irq);
121 if (irq_handlers[irq].handler) {
124 irq_handlers[irq].handler(irq_handlers[irq].arg);
125 irq_handlers[irq].count++;
131 if ((irq & 7) != 7) {
138 #if defined(CONFIG_CMD_IRQ)
139 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
143 printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
144 spurious_irq_cnt, spurious_irq);
146 printf ("Interrupt-Information:\n");
147 printf ("Nr Routine Arg Count\n");
149 for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
150 if (irq_handlers[irq].handler != NULL) {
151 printf ("%02d %08lx %08lx %d\n",
153 (ulong)irq_handlers[irq].handler,
154 (ulong)irq_handlers[irq].arg,
155 irq_handlers[irq].count);