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mpic_msi.c

/*
 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
 *
 * 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; version 2 of the
 * License.
 *
 */

#include <linux/irq.h>
#include <linux/bitmap.h>
#include <linux/msi.h>
#include <asm/mpic.h>
#include <asm/prom.h>
#include <asm/hw_irq.h>
#include <asm/ppc-pci.h>
#include <asm/msi_bitmap.h>

#include <sysdev/mpic.h>

void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
{
      /* The mpic calls this even when there is no allocator setup */
      if (!mpic->msi_bitmap.bitmap)
            return;

      msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
}

#ifdef CONFIG_MPIC_U3_HT_IRQS
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
{
      irq_hw_number_t hwirq;
      struct irq_host_ops *ops = mpic->irqhost->ops;
      struct device_node *np;
      int flags, index, i;
      struct of_irq oirq;

      pr_debug("mpic: found U3, guessing msi allocator setup\n");

      /* Reserve source numbers we know are reserved in the HW */
      for (i = 0;   i < 8;   i++)
            msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);

      for (i = 42;  i < 46;  i++)
            msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);

      for (i = 100; i < 105; i++)
            msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);

      np = NULL;
      while ((np = of_find_all_nodes(np))) {
            pr_debug("mpic: mapping hwirqs for %s\n", np->full_name);

            index = 0;
            while (of_irq_map_one(np, index++, &oirq) == 0) {
                  ops->xlate(mpic->irqhost, NULL, oirq.specifier,
                                    oirq.size, &hwirq, &flags);
                  msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
            }
      }

      return 0;
}
#else
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
{
      return -1;
}
#endif

int mpic_msi_init_allocator(struct mpic *mpic)
{
      int rc;

      rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->irq_count,
                        mpic->irqhost->of_node);
      if (rc)
            return rc;

      rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
      if (rc > 0) {
            if (mpic->flags & MPIC_U3_HT_IRQS)
                  rc = mpic_msi_reserve_u3_hwirqs(mpic);

            if (rc) {
                  msi_bitmap_free(&mpic->msi_bitmap);
                  return rc;
            }
      }

      return 0;
}

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