arch/m68k/apollo/dn_ints.c

   1 #include <linux/interrupt.h>
   2 #include <linux/irq.h>
   3
   4 #include <asm/traps.h>
   5 #include <asm/apollohw.h>
   6
   7 unsigned int apollo_irq_startup(struct irq_data *data)
   8 {
   9         unsigned int irq = data->irq;
  10
  11         if (irq < 8)
  12                 *(volatile unsigned char *)(pica+1) &= ~(1 << irq);
  13         else
  14                 *(volatile unsigned char *)(picb+1) &= ~(1 << (irq - 8));
  15         return 0;
  16 }
  17
  18 void apollo_irq_shutdown(struct irq_data *data)
  19 {
  20         unsigned int irq = data->irq;
  21
  22         if (irq < 8)
  23                 *(volatile unsigned char *)(pica+1) |= (1 << irq);
  24         else
  25                 *(volatile unsigned char *)(picb+1) |= (1 << (irq - 8));
  26 }
  27
  28 void apollo_irq_eoi(struct irq_data *data)
  29 {
  30         *(volatile unsigned char *)(pica) = 0x20;
  31         *(volatile unsigned char *)(picb) = 0x20;
  32 }
  33
  34 static struct irq_chip apollo_irq_chip = {
  35         .name           = "apollo",
  36         .irq_startup    = apollo_irq_startup,
  37         .irq_shutdown   = apollo_irq_shutdown,
  38         .irq_eoi        = apollo_irq_eoi,
  39 };
  40
  41
  42 void __init dn_init_IRQ(void)
  43 {
  44         m68k_setup_user_interrupt(VEC_USER + 96, 16);
  45         m68k_setup_irq_controller(&apollo_irq_chip, handle_fasteoi_irq,
  46                                   IRQ_APOLLO, 16);
  47 }