arch/arm/mach-ebsa110/irq.c

   1 /*
   2  *  linux/arch/arm/mach-ebsa110/irq.c
   3  *
   4  *  Copyright (C) 1996-1998 Russell King
   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  *   22-08-1998 RMK     Restructured IRQ routines
  12  */
  13 #include <linux/init.h>
  14 #include <linux/stddef.h>
  15 #include <linux/list.h>
  16 #include <linux/timer.h>
  17
  18 #include <asm/mach/irq.h>
  19 #include <asm/hardware.h>
  20 #include <asm/io.h>
  21 #include <asm/irq.h>
  22 #include <asm/system.h>
  23
  24 #include "hardware.h"
  25
  26 static void ebsa110_mask_irq(unsigned int irq)
  27 {
  28         __raw_writeb(1 << irq, IRQ_MCLR);
  29 }
  30
  31 static void ebsa110_unmask_irq(unsigned int irq)
  32 {
  33         __raw_writeb(1 << irq, IRQ_MSET);
  34 }
  35
  36 void __init ebsa110_init_irq(void)
  37 {
  38         unsigned long flags;
  39         int irq;
  40
  41         local_irq_save(flags);
  42         __raw_writeb(0xff, IRQ_MCLR);
  43         __raw_writeb(0x55, IRQ_MSET);
  44         __raw_writeb(0x00, IRQ_MSET);
  45         if (__raw_readb(IRQ_MASK) != 0x55)
  46                 while (1);
  47         __raw_writeb(0xff, IRQ_MCLR);   /* clear all interrupt enables */
  48         local_irq_restore(flags);
  49
  50         for (irq = 0; irq < NR_IRQS; irq++) {
  51                 irq_desc[irq].valid     = 1;
  52                 irq_desc[irq].probe_ok  = 1;
  53                 irq_desc[irq].mask_ack  = ebsa110_mask_irq;
  54                 irq_desc[irq].mask      = ebsa110_mask_irq;
  55                 irq_desc[irq].unmask    = ebsa110_unmask_irq;
  56         }
  57 }
  58