LXR uboot/arch/i386/lib/interrupts.c

   1/*
   2 * (C) Copyright 2009
   3 * Graeme Russ, graeme.russ@gmail.com
   4 *
   5 * (C) Copyright 2007
   6 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
   7 *
   8 * (C) Copyright 2006
   9 * Detlev Zundel, DENX Software Engineering, dzu@denx.de
  10 *
  11 * (C) Copyright -2003
  12 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  13 *
  14 * (C) Copyright 2002
  15 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
  16 *
  17 * (C) Copyright 2001
  18 * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
  19 *
  20 * See file CREDITS for list of people who contributed to this
  21 * project.
  22 *
  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.
  27 *
  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.
  32 *
  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,
  36 * MA 02111-1307 USA
  37 */
  38
  39/*
  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
  46 * Daniel Engström
  47 */
  48
  49#include <common.h>
  50#include <asm/interrupt.h>
  51
  52struct irq_action {
  53        interrupt_handler_t *handler;
  54        void *arg;
  55        unsigned int count;
  56};
  57
  58static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
  59static int spurious_irq_cnt = 0;
  60static int spurious_irq = 0;
  61
  62void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
  63{
  64        int status;
  65
  66        if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
  67                printf("irq_install_handler: bad irq number %d\n", irq);
  68                return;
  69        }
  70
  71        if (irq_handlers[irq].handler != NULL)
  72                printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
  73                       (ulong) handler,
  74                       (ulong) irq_handlers[irq].handler);
  75
  76        status = disable_interrupts ();
  77
  78        irq_handlers[irq].handler = handler;
  79        irq_handlers[irq].arg = arg;
  80        irq_handlers[irq].count = 0;
  81
  82        unmask_irq(irq);
  83
  84        if (status)
  85                enable_interrupts();
  86
  87        return;
  88}
  89
  90void irq_free_handler(int irq)
  91{
  92        int status;
  93
  94        if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
  95                printf("irq_free_handler: bad irq number %d\n", irq);
  96                return;
  97        }
  98
  99        status = disable_interrupts ();
 100
 101        mask_irq(irq);
 102
 103        irq_handlers[irq].handler = NULL;
 104        irq_handlers[irq].arg = NULL;
 105
 106        if (status)
 107                enable_interrupts();
 108
 109        return;
 110}
 111
 112void do_irq(int hw_irq)
 113{
 114        int irq = hw_irq - 0x20;
 115
 116        if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
 117                printf("do_irq: bad irq number %d\n", irq);
 118                return;
 119        }
 120
 121        if (irq_handlers[irq].handler) {
 122                mask_irq(irq);
 123
 124                irq_handlers[irq].handler(irq_handlers[irq].arg);
 125                irq_handlers[irq].count++;
 126
 127                unmask_irq(irq);
 128                specific_eoi(irq);
 129
 130        } else {
 131                if ((irq & 7) != 7) {
 132                        spurious_irq_cnt++;
 133                        spurious_irq = irq;
 134                }
 135        }
 136}
 137
 138#if defined(CONFIG_CMD_IRQ)
 139int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 140{
 141        int irq;
 142
 143        printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 144               spurious_irq_cnt, spurious_irq);
 145
 146        printf ("Interrupt-Information:\n");
 147        printf ("Nr  Routine   Arg       Count\n");
 148
 149        for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
 150                if (irq_handlers[irq].handler != NULL) {
 151                        printf ("%02d  %08lx  %08lx  %d\n",
 152                                        irq,
 153                                        (ulong)irq_handlers[irq].handler,
 154                                        (ulong)irq_handlers[irq].arg,
 155                                        irq_handlers[irq].count);
 156                }
 157        }
 158
 159        return 0;
 160}
 161#endif
 162