/* * (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 Engstr�m, 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 Engstr�m */ #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 + gd->reloc_off, (ulong) irq_handlers[irq].handler); status = disable_interrupts (); irq_handlers[irq].handler = handler + gd->reloc_off; 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; } __isr__ do_irq(int irq) { 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