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-rw-r--r--arch/i386/lib/interrupts.c161
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diff --git a/arch/i386/lib/interrupts.c b/arch/i386/lib/interrupts.c
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+/*
+ * (C) Copyright 2009
+ * Graeme Russ, graeme.russ@gmail.com
+ *
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
+ *
+ * (C) Copyright 2006
+ * Detlev Zundel, DENX Software Engineering, dzu@denx.de
+ *
+ * (C) Copyright -2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ *
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * This file contains the high-level API for the interrupt sub-system
+ * of the i386 port of U-Boot. Most of the functionality has been
+ * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
+ * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
+ * credited for the corresponding work on those ports. The original
+ * interrupt handling routines for the i386 port were written by
+ * Daniel Engström
+ */
+
+#include <common.h>
+#include <asm/interrupt.h>
+
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ unsigned int count;
+};
+
+static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
+static int spurious_irq_cnt = 0;
+static int spurious_irq = 0;
+
+void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
+{
+ int status;
+
+ if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
+ printf("irq_install_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ if (irq_handlers[irq].handler != NULL)
+ printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
+ (ulong) handler,
+ (ulong) irq_handlers[irq].handler);
+
+ status = disable_interrupts ();
+
+ irq_handlers[irq].handler = handler;
+ irq_handlers[irq].arg = arg;
+ irq_handlers[irq].count = 0;
+
+ unmask_irq(irq);
+
+ if (status)
+ enable_interrupts();
+
+ return;
+}
+
+void irq_free_handler(int irq)
+{
+ int status;
+
+ if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
+ printf("irq_free_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ status = disable_interrupts ();
+
+ mask_irq(irq);
+
+ irq_handlers[irq].handler = NULL;
+ irq_handlers[irq].arg = NULL;
+
+ if (status)
+ enable_interrupts();
+
+ return;
+}
+
+void do_irq(int hw_irq)
+{
+ int irq = hw_irq - 0x20;
+
+ if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
+ printf("do_irq: bad irq number %d\n", irq);
+ return;
+ }
+
+ if (irq_handlers[irq].handler) {
+ mask_irq(irq);
+
+ irq_handlers[irq].handler(irq_handlers[irq].arg);
+ irq_handlers[irq].count++;
+
+ unmask_irq(irq);
+ specific_eoi(irq);
+
+ } else {
+ if ((irq & 7) != 7) {
+ spurious_irq_cnt++;
+ spurious_irq = irq;
+ }
+ }
+}
+
+#if defined(CONFIG_CMD_IRQ)
+int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ int irq;
+
+ printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
+ spurious_irq_cnt, spurious_irq);
+
+ printf ("Interrupt-Information:\n");
+ printf ("Nr Routine Arg Count\n");
+
+ for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
+ if (irq_handlers[irq].handler != NULL) {
+ printf ("%02d %08lx %08lx %d\n",
+ irq,
+ (ulong)irq_handlers[irq].handler,
+ (ulong)irq_handlers[irq].arg,
+ irq_handlers[irq].count);
+ }
+ }
+
+ return 0;
+}
+#endif