arch/arm/mach-ks8695/irq.c

   1 /*
   2  *  linux/arch/arm/mach-ks8695/irq.c
   3  *
   4  *  Copyright (C) 2002 Micrel Inc.
   5  *  Copyright (C) 2006 Greg Ungerer <gerg@snapgear.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <asm/hardware.h>
  25 #include <asm/irq.h>
  26 #include <asm/io.h>
  27 #include <asm/mach/irq.h>
  28
  29 static void ks8695_irq_mask(unsigned int irq)
  30 {
  31         unsigned long msk;
  32         msk = __raw_readl(KS8695_REG(KS8695_INT_ENABLE));
  33         msk &= ~(1 << irq);
  34         __raw_writel(msk, KS8695_REG(KS8695_INT_ENABLE));
  35 }
  36
  37 static void ks8695_irq_unmask(unsigned int irq)
  38 {
  39         unsigned long msk;
  40         msk = __raw_readl(KS8695_REG(KS8695_INT_ENABLE));
  41         msk |= (1 << irq);
  42         __raw_writel(msk, KS8695_REG(KS8695_INT_ENABLE));
  43 }
  44
  45 static int ks8695_irq_set_type(unsigned int irq, unsigned int type)
  46 {
  47         return 0;
  48 }
  49
  50 struct irqchip ks8695_irq_chip = {
  51         .ack            = ks8695_irq_mask,
  52         .mask           = ks8695_irq_mask,
  53         .unmask         = ks8695_irq_unmask,
  54         .set_type       = ks8695_irq_set_type,
  55 };
  56
  57 void __init ks8695_init_irq(void)
  58 {
  59         unsigned int i;
  60
  61         /* Disable all interrupts initially. */
  62         __raw_writel(0, KS8695_REG(KS8695_INT_CONTL));
  63         __raw_writel(0, KS8695_REG(KS8695_INT_ENABLE));
  64
  65         for (i = 0; (i < NR_IRQS); i++) {
  66                 set_irq_chip(i, &ks8695_irq_chip);
  67                 set_irq_handler(i, do_level_IRQ);
  68                 set_irq_flags(i, IRQF_VALID);
  69         }
  70 }
  71