release/src-rt-6.x.4708/linux/linux-2.6.36/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 static 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 struct irqaction sni_isa_irq = {
  43         .handler = sni_isa_irq_handler,
  44         .name = "ISA",
  45         .flags = IRQF_SHARED | IRQF_DISABLED
  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  */
  53 void __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 }