arch/arm/mach-anakin/irq.c

   1 /*
   2  *  linux/arch/arm/mach-anakin/irq.c
   3  *
   4  *  Copyright (C) 2001 Aleph One Ltd. for Acunia N.V.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   10-Apr-2001 TTC    Created
  12  */
  13
  14 #include <linux/ptrace.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/init.h>
  18 #include <linux/list.h>
  19 #include <linux/timer.h>
  20
  21 #include <asm/irq.h>
  22 #include <asm/mach/irq.h>
  23
  24 extern unsigned int anakin_irq_mask, anakin_active_irqs;
  25 extern void do_IRQ(int, struct pt_regs *);
  26
  27 static void
  28 anakin_mask_irq(unsigned int irq)
  29 {
  30         anakin_irq_mask &= ~(1 << irq);
  31 }
  32
  33 static void
  34 anakin_unmask_irq(unsigned int irq)
  35 {
  36         anakin_irq_mask |= (1 << irq);
  37 }
  38
  39 /*
  40  * This is a faked interrupt to deal with parallel interrupt requests
  41  * on the Anakin.  Make sure that its interrupt number is not in any
  42  * way conflicting with the hardware interrupt numbers!  Check
  43  * IRQ_ANAKIN in linux/include/asm-arm/arch-anakin/irqs.h.
  44  */
  45 static void
  46 anakin_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  47 {
  48         for (irq = 0; irq < NR_IRQS; irq++)
  49                 if (anakin_active_irqs & (1 << irq))
  50                         do_IRQ(irq, regs);
  51 }
  52
  53 static struct irqaction anakin_irq = {
  54         .name           = "Anakin IRQ",
  55         .handler        = anakin_interrupt,
  56         .flags          = SA_INTERRUPT,
  57 };
  58
  59 void __init
  60 irq_init_irq(void)
  61 {
  62         unsigned int irq;
  63
  64         for (irq = 0; irq < NR_IRQS; irq++) {
  65                 switch (irq) {
  66                 case IRQ_UART0:
  67                 case IRQ_UART1:
  68                 case IRQ_UART2:
  69                 case IRQ_TICK:
  70                 case IRQ_CODEC:
  71                 case IRQ_UART4:
  72                 case IRQ_TOUCHSCREEN:
  73                 case IRQ_UART3:
  74                 case IRQ_FIFO:
  75                 case IRQ_CAN:
  76                 case IRQ_COMPACTFLASH:
  77                 case IRQ_BOSH:
  78                 case IRQ_ANAKIN:
  79                         irq_desc[irq].valid = 1;
  80                         irq_desc[irq].mask_ack = anakin_mask_irq;
  81                         irq_desc[irq].mask = anakin_mask_irq;
  82                         irq_desc[irq].unmask = anakin_unmask_irq;
  83                 }
  84         }
  85         setup_arm_irq(IRQ_ANAKIN, &anakin_irq);
  86 }