LXR uboot/arch/powerpc/cpu/mpc824x/interrupts.c

   1/*
   2 * (C) Copyright 2000-2002
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 * Rob Taylor, Flying Pig Systems. robt@flyingpig.com
   5 *
   6 * See file CREDITS for list of people who contributed to this
   7 * project.
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License as
  11 * published by the Free Software Foundation; either version 2 of
  12 * the License, or (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22 * MA 02111-1307 USA
  23 */
  24
  25#include <common.h>
  26#include <mpc824x.h>
  27#include <asm/processor.h>
  28#include <asm/pci_io.h>
  29#include <commproc.h>
  30#include "drivers/epic.h"
  31
  32int interrupt_init_cpu (unsigned *decrementer_count)
  33{
  34        *decrementer_count = (get_bus_freq (0) / 4) / CONFIG_SYS_HZ;
  35
  36        /*
  37         * It's all broken at the moment and I currently don't need
  38         * interrupts. If you want to fix it, have a look at the epic
  39         * drivers in dink32 v12. They do everthing and Motorola said
  40         * I could use the dink source in this project as long as
  41         * copyright notices remain intact.
  42         */
  43
  44        epicInit (EPIC_DIRECT_IRQ, 0);
  45        /* EPIC won't generate INT unless Current Task Pri < 15 */
  46        epicCurTaskPrioSet(0);
  47
  48        return (0);
  49}
  50
  51/****************************************************************************/
  52
  53/*
  54 * Handle external interrupts
  55 */
  56void external_interrupt (struct pt_regs *regs)
  57{
  58        register unsigned long temp;
  59
  60        pci_readl (CONFIG_SYS_EUMB_ADDR + EPIC_PROC_INT_ACK_REG, temp);
  61        sync ();                                        /* i'm not convinced this is needed, but dink source has it */
  62        temp &= 0xff;                           /*get vector */
  63
  64        /*TODO: handle them -... */
  65        epicEOI ();
  66}
  67
  68/****************************************************************************/
  69
  70/*
  71 * blank int handlers.
  72 */
  73
  74void
  75irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
  76{
  77}
  78
  79void irq_free_handler (int vec)
  80{
  81
  82}
  83
  84/*TODO: some handlers for winbond and 87308 interrupts
  85 and what about generic pci inteerupts?
  86 vga?
  87 */
  88
  89void timer_interrupt_cpu (struct pt_regs *regs)
  90{
  91        /* nothing to do here */
  92        return;
  93}
  94