release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-nuc93x/irq.c

   1 /*
   2  * linux/arch/arm/mach-nuc93x/irq.c
   3  *
   4  * Copyright (c) 2008 Nuvoton technology corporation.
   5  *
   6  * Wan ZongShun <mcuos.com@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation;version 2 of the License.
  11  *
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/ioport.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/sysdev.h>
  20 #include <linux/io.h>
  21
  22 #include <asm/irq.h>
  23 #include <asm/mach/irq.h>
  24
  25 #include <mach/hardware.h>
  26 #include <mach/regs-irq.h>
  27
  28 static void nuc93x_irq_mask(unsigned int irq)
  29 {
  30         __raw_writel(1 << irq, REG_AIC_MDCR);
  31 }
  32
  33 /*
  34  * By the w90p910 spec,any irq,only write 1
  35  * to REG_AIC_EOSCR for ACK
  36  */
  37
  38 static void nuc93x_irq_ack(unsigned int irq)
  39 {
  40         __raw_writel(0x01, REG_AIC_EOSCR);
  41 }
  42
  43 static void nuc93x_irq_unmask(unsigned int irq)
  44 {
  45         __raw_writel(1 << irq, REG_AIC_MECR);
  46
  47 }
  48
  49 static struct irq_chip nuc93x_irq_chip = {
  50         .ack       = nuc93x_irq_ack,
  51         .mask      = nuc93x_irq_mask,
  52         .unmask    = nuc93x_irq_unmask,
  53 };
  54
  55 void __init nuc93x_init_irq(void)
  56 {
  57         int irqno;
  58
  59         __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
  60
  61         for (irqno = IRQ_WDT; irqno <= NR_IRQS; irqno++) {
  62                 set_irq_chip(irqno, &nuc93x_irq_chip);
  63                 set_irq_handler(irqno, handle_level_irq);
  64                 set_irq_flags(irqno, IRQF_VALID);
  65         }
  66 }