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intc-simr.c

/*
 * intc-simr.c
 *
 * (C) Copyright 2009, Greg Ungerer <gerg@snapgear.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/traps.h>

static void intc_irq_mask(unsigned int irq)
{
      if (irq >= MCFINT_VECBASE) {
            if (irq < MCFINT_VECBASE + 64)
                  __raw_writeb(irq - MCFINT_VECBASE, MCFINTC0_SIMR);
            else if ((irq < MCFINT_VECBASE + 128) && MCFINTC1_SIMR)
                  __raw_writeb(irq - MCFINT_VECBASE - 64, MCFINTC1_SIMR);
      }
}

static void intc_irq_unmask(unsigned int irq)
{
      if (irq >= MCFINT_VECBASE) {
            if (irq < MCFINT_VECBASE + 64)
                  __raw_writeb(irq - MCFINT_VECBASE, MCFINTC0_CIMR);
            else if ((irq < MCFINT_VECBASE + 128) && MCFINTC1_CIMR)
                  __raw_writeb(irq - MCFINT_VECBASE - 64, MCFINTC1_CIMR);
      }
}

static int intc_irq_set_type(unsigned int irq, unsigned int type)
{
      if (irq >= MCFINT_VECBASE) {
            if (irq < MCFINT_VECBASE + 64)
                  __raw_writeb(5, MCFINTC0_ICR0 + irq - MCFINT_VECBASE);
            else if ((irq < MCFINT_VECBASE) && MCFINTC1_ICR0)
                  __raw_writeb(5, MCFINTC1_ICR0 + irq - MCFINT_VECBASE - 64);
      }
      return 0;
}

static struct irq_chip intc_irq_chip = {
      .name       = "CF-INTC",
      .mask       = intc_irq_mask,
      .unmask           = intc_irq_unmask,
      .set_type   = intc_irq_set_type,
};

void __init init_IRQ(void)
{
      int irq;

      init_vectors();

      /* Mask all interrupt sources */
      __raw_writeb(0xff, MCFINTC0_SIMR);
      if (MCFINTC1_SIMR)
            __raw_writeb(0xff, MCFINTC1_SIMR);

      for (irq = 0; (irq < NR_IRQS); irq++) {
            irq_desc[irq].status = IRQ_DISABLED;
            irq_desc[irq].action = NULL;
            irq_desc[irq].depth = 1;
            irq_desc[irq].chip = &intc_irq_chip;
            intc_irq_set_type(irq, 0);
      }
}


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