linux/arch/mips/sni/irq.c
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   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1992 Linus Torvalds
   7 * Copyright (C) 1994 - 2000 Ralf Baechle
   8 * Copyright (C) 2006 Thomas Bogendoerfer
   9 */
  10#include <linux/delay.h>
  11#include <linux/init.h>
  12#include <linux/interrupt.h>
  13#include <linux/irq.h>
  14#include <linux/kernel.h>
  15
  16#include <asm/i8259.h>
  17#include <asm/io.h>
  18#include <asm/sni.h>
  19#include <asm/irq.h>
  20#include <asm/irq_cpu.h>
  21
  22void (*sni_hwint)(void);
  23
  24asmlinkage void plat_irq_dispatch(void)
  25{
  26        sni_hwint();
  27}
  28
  29/* ISA irq handler */
  30irqreturn_t sni_isa_irq_handler(int dummy, void *p)
  31{
  32        int irq;
  33
  34        irq = i8259_irq();
  35        if (unlikely(irq < 0))
  36                return IRQ_NONE;
  37
  38        generic_handle_irq(irq);
  39        return IRQ_HANDLED;
  40}
  41
  42/*
  43 * On systems with i8259-style interrupt controllers we assume for
  44 * driver compatibility reasons interrupts 0 - 15 to be the i8295
  45 * interrupts even if the hardware uses a different interrupt numbering.
  46 */
  47void __init arch_init_irq(void)
  48{
  49        init_i8259_irqs();                      /* Integrated i8259  */
  50        switch (sni_brd_type) {
  51        case SNI_BRD_10:
  52        case SNI_BRD_10NEW:
  53        case SNI_BRD_TOWER_OASIC:
  54        case SNI_BRD_MINITOWER:
  55                sni_a20r_irq_init();
  56                break;
  57
  58        case SNI_BRD_PCI_TOWER:
  59                sni_pcit_irq_init();
  60                break;
  61
  62        case SNI_BRD_PCI_TOWER_CPLUS:
  63                sni_pcit_cplus_irq_init();
  64                break;
  65
  66        case SNI_BRD_RM200:
  67                sni_rm200_irq_init();
  68                break;
  69
  70        case SNI_BRD_PCI_MTOWER:
  71        case SNI_BRD_PCI_DESKTOP:
  72        case SNI_BRD_PCI_MTOWER_CPLUS:
  73                sni_pcimt_irq_init();
  74                break;
  75        }
  76}
  77