arch/arm/mach-w90x900/irq.c

   1 /*
   2  * linux/arch/arm/mach-w90x900/irq.c
   3  *
   4  * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
   5  *
   6  * Copyright (c) 2008 Nuvoton technology corporation
   7  * All rights reserved.
   8  *
   9  * Wan ZongShun <mcuos.com@gmail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/ioport.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/sysdev.h>
  24 #include <linux/io.h>
  25
  26 #include <asm/irq.h>
  27 #include <asm/mach/irq.h>
  28
  29 #include <mach/hardware.h>
  30 #include <mach/regs-irq.h>
  31
  32 static void w90x900_irq_mask(unsigned int irq)
  33 {
  34         __raw_writel(1 << irq, REG_AIC_MDCR);
  35 }
  36
  37 /*
  38  * By the w90p910 spec,any irq,only write 1
  39  * to REG_AIC_EOSCR for ACK
  40  */
  41
  42 static void w90x900_irq_ack(unsigned int irq)
  43 {
  44         __raw_writel(0x01, REG_AIC_EOSCR);
  45 }
  46
  47 static void w90x900_irq_unmask(unsigned int irq)
  48 {
  49         unsigned long mask;
  50
  51         if (irq == IRQ_T_INT_GROUP) {
  52                 mask = __raw_readl(REG_AIC_GEN);
  53                 __raw_writel(TIME_GROUP_IRQ | mask, REG_AIC_GEN);
  54                 __raw_writel(1 << IRQ_T_INT_GROUP, REG_AIC_MECR);
  55         }
  56         __raw_writel(1 << irq, REG_AIC_MECR);
  57 }
  58
  59 static struct irq_chip w90x900_irq_chip = {
  60         .ack       = w90x900_irq_ack,
  61         .mask      = w90x900_irq_mask,
  62         .unmask    = w90x900_irq_unmask,
  63 };
  64
  65 void __init w90x900_init_irq(void)
  66 {
  67         int irqno;
  68
  69         __raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
  70
  71         for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
  72                 set_irq_chip(irqno, &w90x900_irq_chip);
  73                 set_irq_handler(irqno, handle_level_irq);
  74                 set_irq_flags(irqno, IRQF_VALID);
  75         }
  76 }