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pic.c

/*
 * Copyright 2008 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/of_platform.h>

#include <asm/system.h>
#include <asm/mpic.h>
#include <asm/i8259.h>

#ifdef CONFIG_PPC_I8259
static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
{
      unsigned int cascade_irq = i8259_irq();
      if (cascade_irq != NO_IRQ)
            generic_handle_irq(cascade_irq);
      desc->chip->eoi(irq);
}
#endif      /* CONFIG_PPC_I8259 */

void __init mpc86xx_init_irq(void)
{
      struct mpic *mpic;
      struct device_node *np;
      struct resource res;
#ifdef CONFIG_PPC_I8259
      struct device_node *cascade_node = NULL;
      int cascade_irq;
#endif

      /* Determine PIC address. */
      np = of_find_node_by_type(NULL, "open-pic");
      if (np == NULL)
            return;
      of_address_to_resource(np, 0, &res);

      mpic = mpic_alloc(np, res.start,
                  MPIC_PRIMARY | MPIC_WANTS_RESET |
                  MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                  MPIC_SINGLE_DEST_CPU,
                  0, 256, " MPIC     ");
      of_node_put(np);
      BUG_ON(mpic == NULL);

      mpic_init(mpic);

#ifdef CONFIG_PPC_I8259
      /* Initialize i8259 controller */
      for_each_node_by_type(np, "interrupt-controller")
            if (of_device_is_compatible(np, "chrp,iic")) {
                  cascade_node = np;
                  break;
            }

      if (cascade_node == NULL) {
            printk(KERN_DEBUG "Could not find i8259 PIC\n");
            return;
      }

      cascade_irq = irq_of_parse_and_map(cascade_node, 0);
      if (cascade_irq == NO_IRQ) {
            printk(KERN_ERR "Failed to map cascade interrupt\n");
            return;
      }

      i8259_init(cascade_node, 0);
      of_node_put(cascade_node);

      set_irq_chained_handler(cascade_irq, mpc86xx_8259_cascade);
#endif
}

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