LXR linux/arch/arm/mach-iop32x/irq.c

   1/*
   2 * arch/arm/mach-iop32x/irq.c
   3 *
   4 * Generic IOP32X IRQ handling functionality
   5 *
   6 * Author: Rory Bolt <rorybolt@pacbell.net>
   7 * Copyright (C) 2002 Rory Bolt
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13
  14#include <linux/init.h>
  15#include <linux/interrupt.h>
  16#include <linux/list.h>
  17#include <asm/mach/irq.h>
  18#include <asm/irq.h>
  19#include <asm/hardware.h>
  20#include <asm/mach-types.h>
  21
  22static u32 iop32x_mask;
  23
  24static void intctl_write(u32 val)
  25{
  26        asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
  27}
  28
  29static void intstr_write(u32 val)
  30{
  31        asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
  32}
  33
  34static void
  35iop32x_irq_mask(unsigned int irq)
  36{
  37        iop32x_mask &= ~(1 << irq);
  38        intctl_write(iop32x_mask);
  39}
  40
  41static void
  42iop32x_irq_unmask(unsigned int irq)
  43{
  44        iop32x_mask |= 1 << irq;
  45        intctl_write(iop32x_mask);
  46}
  47
  48struct irq_chip ext_chip = {
  49        .name   = "IOP32x",
  50        .ack    = iop32x_irq_mask,
  51        .mask   = iop32x_irq_mask,
  52        .unmask = iop32x_irq_unmask,
  53};
  54
  55void __init iop32x_init_irq(void)
  56{
  57        int i;
  58
  59        iop_init_cp6_handler();
  60
  61        intctl_write(0);
  62        intstr_write(0);
  63        if (machine_is_glantank() ||
  64            machine_is_iq80321() ||
  65            machine_is_iq31244() ||
  66            machine_is_n2100() ||
  67            machine_is_em7210())
  68                *IOP3XX_PCIIRSR = 0x0f;
  69
  70        for (i = 0; i < NR_IRQS; i++) {
  71                set_irq_chip(i, &ext_chip);
  72                set_irq_handler(i, handle_level_irq);
  73                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
  74        }
  75}
  76