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 #include "hpsim_ssc.h"
  14
  15 static unsigned int
  16 hpsim_irq_startup(struct irq_data *data)
  17 {
  18         return 0;
  19 }
  20
  21 static void
  22 hpsim_irq_noop(struct irq_data *data)
  23 {
  24 }
  25
  26 static int
  27 hpsim_set_affinity_noop(struct irq_data *d, const struct cpumask *b, bool f)
  28 {
  29         return 0;
  30 }
  31
  32 static struct irq_chip irq_type_hp_sim = {
  33         .name =                 "hpsim",
  34         .irq_startup =          hpsim_irq_startup,
  35         .irq_shutdown =         hpsim_irq_noop,
  36         .irq_enable =           hpsim_irq_noop,
  37         .irq_disable =          hpsim_irq_noop,
  38         .irq_ack =              hpsim_irq_noop,
  39         .irq_set_affinity =     hpsim_set_affinity_noop,
  40 };
  41
  42 static void hpsim_irq_set_chip(int irq)
  43 {
  44         struct irq_chip *chip = irq_get_chip(irq);
  45
  46         if (chip == &no_irq_chip)
  47                 irq_set_chip(irq, &irq_type_hp_sim);
  48 }
  49
  50 static void hpsim_connect_irq(int intr, int irq)
  51 {
  52         ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
  53 }
  54
  55 int hpsim_get_irq(int intr)
  56 {
  57         int irq = assign_irq_vector(AUTO_ASSIGN);
  58
  59         if (irq >= 0) {
  60                 hpsim_irq_set_chip(irq);
  61                 irq_set_handler(irq, handle_simple_irq);
  62                 hpsim_connect_irq(intr, irq);
  63         }
  64
  65         return irq;
  66 }
  67
  68 void __init
  69 hpsim_irq_init (void)
  70 {
  71         int i;
  72
  73         for_each_active_irq(i)
  74                 hpsim_irq_set_chip(i);
  75 }