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Sourcecode: linux-2.6 version File versions

irq.c

/*
 *  Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/arch/common.h>

/* Disable interrupt number "irq" in the AVIC */
static void mxc_mask_irq(unsigned int irq)
{
      __raw_writel(irq, AVIC_INTDISNUM);
}

/* Enable interrupt number "irq" in the AVIC */
static void mxc_unmask_irq(unsigned int irq)
{
      __raw_writel(irq, AVIC_INTENNUM);
}

static struct irq_chip mxc_avic_chip = {
      .mask_ack = mxc_mask_irq,
      .mask = mxc_mask_irq,
      .unmask = mxc_unmask_irq,
};

/*
 * This function initializes the AVIC hardware and disables all the
 * interrupts. It registers the interrupt enable and disable functions
 * to the kernel for each interrupt source.
 */
void __init mxc_init_irq(void)
{
      int i;
      u32 reg;

      /* put the AVIC into the reset value with
       * all interrupts disabled
       */
      __raw_writel(0, AVIC_INTCNTL);
      __raw_writel(0x1f, AVIC_NIMASK);

      /* disable all interrupts */
      __raw_writel(0, AVIC_INTENABLEH);
      __raw_writel(0, AVIC_INTENABLEL);

      /* all IRQ no FIQ */
      __raw_writel(0, AVIC_INTTYPEH);
      __raw_writel(0, AVIC_INTTYPEL);
      for (i = 0; i < MXC_MAX_INT_LINES; i++) {
            set_irq_chip(i, &mxc_avic_chip);
            set_irq_handler(i, handle_level_irq);
            set_irq_flags(i, IRQF_VALID);
      }

      /* Set WDOG2's interrupt the highest priority level (bit 28-31) */
      reg = __raw_readl(AVIC_NIPRIORITY6);
      reg |= (0xF << 28);
      __raw_writel(reg, AVIC_NIPRIORITY6);

      printk(KERN_INFO "MXC IRQ initialized\n");
}

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