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
  22 void (*sni_hwint)(void);
  23
  24 asmlinkage void plat_irq_dispatch(void)
  25 {
  26         sni_hwint();
  27 }
  28
  29 /* ISA irq handler */
  30 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
  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  */
  47 void __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 }