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 <mach/hardware.h>
  20 #include <asm/mach-types.h>
  21
  22 static u32 iop32x_mask;
  23
  24 static void intctl_write(u32 val)
  25 {
  26         asm volatile("mcr p6, 0, %0, c0, c0, 0" : : "r" (val));
  27 }
  28
  29 static void intstr_write(u32 val)
  30 {
  31         asm volatile("mcr p6, 0, %0, c4, c0, 0" : : "r" (val));
  32 }
  33
  34 static void
  35 iop32x_irq_mask(unsigned int irq)
  36 {
  37         iop32x_mask &= ~(1 << irq);
  38         intctl_write(iop32x_mask);
  39 }
  40
  41 static void
  42 iop32x_irq_unmask(unsigned int irq)
  43 {
  44         iop32x_mask |= 1 << irq;
  45         intctl_write(iop32x_mask);
  46 }
  47
  48 struct irq_chip ext_chip = {
  49         .name   = "IOP32x",
  50         .ack    = iop32x_irq_mask,
  51         .mask   = iop32x_irq_mask,
  52         .unmask = iop32x_irq_unmask,
  53 };
  54
  55 void __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 }