arch/ia64/hp/sim/hpsim_irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Platform dependent support for HP simulator.
   4  *
   5  * Copyright (C) 1998-2001 Hewlett-Packard Co
   6  * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/irq.h>
  13
  14 #include "hpsim_ssc.h"
  15
  16 static unsigned int
  17 hpsim_irq_startup(struct irq_data *data)
  18 {
  19         return 0;
  20 }
  21
  22 static void
  23 hpsim_irq_noop(struct irq_data *data)
  24 {
  25 }
  26
  27 static int
  28 hpsim_set_affinity_noop(struct irq_data *d, const struct cpumask *b, bool f)
  29 {
  30         return 0;
  31 }
  32
  33 static struct irq_chip irq_type_hp_sim = {
  34         .name =                 "hpsim",
  35         .irq_startup =          hpsim_irq_startup,
  36         .irq_shutdown =         hpsim_irq_noop,
  37         .irq_enable =           hpsim_irq_noop,
  38         .irq_disable =          hpsim_irq_noop,
  39         .irq_ack =              hpsim_irq_noop,
  40         .irq_set_affinity =     hpsim_set_affinity_noop,
  41 };
  42
  43 static void hpsim_irq_set_chip(int irq)
  44 {
  45         struct irq_chip *chip = irq_get_chip(irq);
  46
  47         if (chip == &no_irq_chip)
  48                 irq_set_chip(irq, &irq_type_hp_sim);
  49 }
  50
  51 static void hpsim_connect_irq(int intr, int irq)
  52 {
  53         ia64_ssc(intr, irq, 0, 0, SSC_CONNECT_INTERRUPT);
  54 }
  55
  56 int hpsim_get_irq(int intr)
  57 {
  58         int irq = assign_irq_vector(AUTO_ASSIGN);
  59
  60         if (irq >= 0) {
  61                 hpsim_irq_set_chip(irq);
  62                 irq_set_handler(irq, handle_simple_irq);
  63                 hpsim_connect_irq(intr, irq);
  64         }
  65
  66         return irq;
  67 }
  68
  69 void __init
  70 hpsim_irq_init (void)
  71 {
  72         int i;
  73
  74         for_each_active_irq(i)
  75                 hpsim_irq_set_chip(i);
  76 }