LXR linux/arch/mips/sni/irq.c

   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 */
  30static irqreturn_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
  42struct irqaction sni_isa_irq = {
  43        .handler = sni_isa_irq_handler,
  44        .name = "ISA",
  45        .flags = IRQF_SHARED
  46};
  47
  48/*
  49 * On systems with i8259-style interrupt controllers we assume for
  50 * driver compatibility reasons interrupts 0 - 15 to be the i8295
  51 * interrupts even if the hardware uses a different interrupt numbering.
  52 */
  53void __init arch_init_irq(void)
  54{
  55        init_i8259_irqs();                      /* Integrated i8259  */
  56        switch (sni_brd_type) {
  57        case SNI_BRD_10:
  58        case SNI_BRD_10NEW:
  59        case SNI_BRD_TOWER_OASIC:
  60        case SNI_BRD_MINITOWER:
  61                sni_a20r_irq_init();
  62                break;
  63
  64        case SNI_BRD_PCI_TOWER:
  65                sni_pcit_irq_init();
  66                break;
  67
  68        case SNI_BRD_PCI_TOWER_CPLUS:
  69                sni_pcit_cplus_irq_init();
  70                break;
  71
  72        case SNI_BRD_RM200:
  73                sni_rm200_irq_init();
  74                break;
  75
  76        case SNI_BRD_PCI_MTOWER:
  77        case SNI_BRD_PCI_DESKTOP:
  78        case SNI_BRD_PCI_MTOWER_CPLUS:
  79                sni_pcimt_irq_init();
  80                break;
  81        }
  82}
  83