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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, Mission Critical Linux, Inc, <huber@mclx.com>
*
* 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 x86 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 x86 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 * const 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
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