arch/ia64/kernel/irq_lsapic.c

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