arch/ppc/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
  32 int 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  */
  56 void 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
  74 void
  75 irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
  76 {
  77 }
  78
  79 void 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
  89 void timer_interrupt_cpu (struct pt_regs *regs)
  90 {
  91         /* nothing to do here */
  92         return;
  93 }