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iop331-irq.c

/*
 * linux/arch/arm/mach-iop3xx/iop331-irq.c
 *
 * Generic IOP331 IRQ handling functionality
 *
 * Author: Dave Jiang <dave.jiang@intel.com>
 * Copyright (C) 2003 Intel Corp.
 *
 * 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/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>

#include <asm/mach/irq.h>
#include <asm/irq.h>
#include <asm/hardware.h>

#include <asm/mach-types.h>

static u32 iop331_mask0 = 0;
static u32 iop331_mask1 = 0;

static inline void intctl_write0(u32 val)
{
    // INTCTL0
      asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val));
}

static inline void intctl_write1(u32 val)
{
    // INTCTL1
    asm volatile("mcr p6,0,%0,c1,c0,0"::"r" (val));
}

static inline void intstr_write0(u32 val)
{
    // INTSTR0
      asm volatile("mcr p6,0,%0,c2,c0,0"::"r" (val));
}

static inline void intstr_write1(u32 val)
{
    // INTSTR1
      asm volatile("mcr p6,0,%0,c3,c0,0"::"r" (val));
}

static void
iop331_irq_mask1 (unsigned int irq)
{
        iop331_mask0 &= ~(1 << (irq - IOP331_IRQ_OFS));
        intctl_write0(iop331_mask0);
}

static void
iop331_irq_mask2 (unsigned int irq)
{
        iop331_mask1 &= ~(1 << (irq - IOP331_IRQ_OFS - 32));
        intctl_write1(iop331_mask1);
}

static void
iop331_irq_unmask1(unsigned int irq)
{
        iop331_mask0 |= (1 << (irq - IOP331_IRQ_OFS));
        intctl_write0(iop331_mask0);
}

static void
iop331_irq_unmask2(unsigned int irq)
{
        iop331_mask1 |= (1 << (irq - IOP331_IRQ_OFS - 32));
        intctl_write1(iop331_mask1);
}

struct irq_chip iop331_irqchip1 = {
      .name = "IOP-1",
      .ack    = iop331_irq_mask1,
      .mask   = iop331_irq_mask1,
      .unmask = iop331_irq_unmask1,
};

struct irq_chip iop331_irqchip2 = {
      .name = "IOP-2",
      .ack    = iop331_irq_mask2,
      .mask   = iop331_irq_mask2,
      .unmask = iop331_irq_unmask2,
};

void __init iop331_init_irq(void)
{
      unsigned int i, tmp;

      /* Enable access to coprocessor 6 for dealing with IRQs.
       * From RMK:
       * Basically, the Intel documentation here is poor.  It appears that
       * you need to set the bit to be able to access the coprocessor from
       * SVC mode.  Whether that allows access from user space or not is
       * unclear.
       */
      asm volatile (
            "mrc p15, 0, %0, c15, c1, 0\n\t"
            "orr %0, %0, %1\n\t"
            "mcr p15, 0, %0, c15, c1, 0\n\t"
            /* The action is delayed, so we have to do this: */
            "mrc p15, 0, %0, c15, c1, 0\n\t"
            "mov %0, %0\n\t"
            "sub pc, pc, #4"
            : "=r" (tmp) : "i" (1 << 6) );

      intctl_write0(0);       // disable all interrupts
      intctl_write1(0);
      intstr_write0(0);       // treat all as IRQ
      intstr_write1(0);
      if(machine_is_iq80331())      // all interrupts are inputs to chip
            *IOP331_PCIIRSR = 0x0f;

      for(i = IOP331_IRQ_OFS; i < NR_IOP331_IRQS; i++)
      {
            set_irq_chip(i, (i < 32) ? &iop331_irqchip1 : &iop331_irqchip2);
            set_irq_handler(i, do_level_IRQ);
            set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
      }
}


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