arch/ia64/kernel/irq_lsapic.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * LSAPIC Interrupt Controller
   4  *
   5  * This takes care of interrupts that are generated by the CPU's
   6  * internal Streamlined Advanced Programmable Interrupt Controller
   7  * (LSAPIC), such as the ITC and IPI interrupts.
   8     *
   9  * Copyright (C) 1999 VA Linux Systems
  10  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  11  * Copyright (C) 2000 Hewlett-Packard Co
  12  * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
  13  */
  14
  15 #include <linux/sched.h>
  16 #include <linux/irq.h>
  17
  18 static unsigned int
  19 lsapic_noop_startup (struct irq_data *data)
  20 {
  21         return 0;
  22 }
  23
  24 static void
  25 lsapic_noop (struct irq_data *data)
  26 {
  27         /* nothing to do... */
  28 }
  29
  30 static int lsapic_retrigger(struct irq_data *data)
  31 {
  32         ia64_resend_irq(data->irq);
  33
  34         return 1;
  35 }
  36
  37 struct irq_chip irq_type_ia64_lsapic = {
  38         .name =                 "LSAPIC",
  39         .irq_startup =          lsapic_noop_startup,
  40         .irq_shutdown =         lsapic_noop,
  41         .irq_enable =           lsapic_noop,
  42         .irq_disable =          lsapic_noop,
  43         .irq_ack =              lsapic_noop,
  44         .irq_retrigger =        lsapic_retrigger,
  45 };