Logo Search packages:      
Sourcecode: linux version File versions  Download package

irq.c

/*
 * arch/arm/mach-ns9xxx/irq.c
 *
 * Copyright (C) 2006,2007 by Digi International 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/interrupt.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
#include <asm/arch-ns9xxx/regs-sys.h>
#include <asm/arch-ns9xxx/irqs.h>
#include <asm/arch-ns9xxx/board.h>

#include "generic.h"

static void ns9xxx_mask_irq(unsigned int irq)
{
      /* XXX: better use cpp symbols */
      u32 ic = __raw_readl(SYS_IC(irq / 4));
      ic &= ~(1 << (7 + 8 * (3 - (irq & 3))));
      __raw_writel(ic, SYS_IC(irq / 4));
}

static void ns9xxx_ack_irq(unsigned int irq)
{
      __raw_writel(0, SYS_ISRADDR);
}

static void ns9xxx_maskack_irq(unsigned int irq)
{
      ns9xxx_mask_irq(irq);
      ns9xxx_ack_irq(irq);
}

static void ns9xxx_unmask_irq(unsigned int irq)
{
      /* XXX: better use cpp symbols */
      u32 ic = __raw_readl(SYS_IC(irq / 4));
      ic |= 1 << (7 + 8 * (3 - (irq & 3)));
      __raw_writel(ic, SYS_IC(irq / 4));
}

static struct irq_chip ns9xxx_chip = {
      .ack        = ns9xxx_ack_irq,
      .mask       = ns9xxx_mask_irq,
      .mask_ack   = ns9xxx_maskack_irq,
      .unmask           = ns9xxx_unmask_irq,
};

void __init ns9xxx_init_irq(void)
{
      int i;

      /* disable all IRQs */
      for (i = 0; i < 8; ++i)
            __raw_writel((4 * i) << 24 | (4 * i + 1) << 16 |
                        (4 * i + 2) << 8 | (4 * i + 3), SYS_IC(i));

      /* simple interrupt prio table:
       * prio(x) < prio(y) <=> x < y
       */
      for (i = 0; i < 32; ++i)
            __raw_writel(i, SYS_IVA(i));

      for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) {
            set_irq_chip(i, &ns9xxx_chip);
            set_irq_handler(i, handle_level_irq);
            set_irq_flags(i, IRQF_VALID);
      }
}

Generated by  Doxygen 1.6.0   Back to index