LXR uboot/arch/arm/cpu/ixp/interrupts.c

   1/*
   2 * (C) Copyright 2006
   3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
   4 *
   5 * (C) Copyright 2002
   6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7 * Marius Groeger <mgroeger@sysgo.de>
   8 *
   9 * (C) Copyright 2002
  10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  11 * Alex Zuepke <azu@sysgo.de>
  12 *
  13 * See file CREDITS for list of people who contributed to this
  14 * project.
  15 *
  16 * This program is free software; you can redistribute it and/or
  17 * modify it under the terms of the GNU General Public License as
  18 * published by the Free Software Foundation; either version 2 of
  19 * the License, or (at your option) any later version.
  20 *
  21 * This program is distributed in the hope that it will be useful,
  22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 * GNU General Public License for more details.
  25 *
  26 * You should have received a copy of the GNU General Public License
  27 * along with this program; if not, write to the Free Software
  28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29 * MA 02111-1307 USA
  30 */
  31
  32#include <common.h>
  33#include <asm/arch/ixp425.h>
  34#include <asm/proc-armv/ptrace.h>
  35
  36struct _irq_handler {
  37        void                *m_data;
  38        void (*m_func)( void *data);
  39};
  40
  41static struct _irq_handler IRQ_HANDLER[N_IRQS];
  42
  43static void default_isr(void *data)
  44{
  45        printf("default_isr():  called for IRQ %d, Interrupt Status=%x PR=%x\n",
  46               (int)data, *IXP425_ICIP, *IXP425_ICIH);
  47}
  48
  49static int next_irq(void)
  50{
  51        return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
  52}
  53
  54void do_irq (struct pt_regs *pt_regs)
  55{
  56        int irq = next_irq();
  57
  58        IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
  59}
  60
  61void irq_install_handler (int irq, interrupt_handler_t handle_irq, void *data)
  62{
  63        if (irq >= N_IRQS || !handle_irq)
  64                return;
  65
  66        IRQ_HANDLER[irq].m_data = data;
  67        IRQ_HANDLER[irq].m_func = handle_irq;
  68}
  69
  70int arch_interrupt_init (void)
  71{
  72        int i;
  73
  74        /* install default interrupt handlers */
  75        for (i = 0; i < N_IRQS; i++)
  76                irq_install_handler(i, default_isr, (void *)i);
  77
  78        /* configure interrupts for IRQ mode */
  79        *IXP425_ICLR = 0x00000000;
  80
  81        return (0);
  82}
  83