arch/ia64/hp/sim/hpsim_irq.c

   1 /*
   2  * Platform dependent support for HP simulator.
   3  *
   4  * Copyright (C) 1998-2001 Hewlett-Packard Co
   5  * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <linux/irq.h>
  12
  13 static unsigned int
  14 hpsim_irq_startup (unsigned int irq)
  15 {
  16         return 0;
  17 }
  18
  19 static void
  20 hpsim_irq_noop (unsigned int irq)
  21 {
  22 }
  23
  24 static int
  25 hpsim_set_affinity_noop(unsigned int a, const struct cpumask *b)
  26 {
  27         return 0;
  28 }
  29
  30 static struct irq_chip irq_type_hp_sim = {
  31         .name =         "hpsim",
  32         .startup =      hpsim_irq_startup,
  33         .shutdown =     hpsim_irq_noop,
  34         .enable =       hpsim_irq_noop,
  35         .disable =      hpsim_irq_noop,
  36         .ack =          hpsim_irq_noop,
  37         .end =          hpsim_irq_noop,
  38         .set_affinity = hpsim_set_affinity_noop,
  39 };
  40
  41 void __init
  42 hpsim_irq_init (void)
  43 {
  44         struct irq_desc *idesc;
  45         int i;
  46
  47         for (i = 0; i < NR_IRQS; ++i) {
  48                 idesc = irq_desc + i;
  49                 if (idesc->chip == &no_irq_chip)
  50                         idesc->chip = &irq_type_hp_sim;
  51         }
  52 }