irqdomain.c

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/*
 * IRQ domain support for SH INTC subsystem
 *
 * Copyright (C) 2012  Paul Mundt
 *
 * 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.
 */
#define pr_fmt(fmt) "intc: " fmt

#include <linux/irqdomain.h>
#include <linux/sh_intc.h>
#include <linux/export.h>
#include "internals.h"

static int intc_evt_xlate(struct irq_domain *d, struct device_node *ctrlr,
              const u32 *intspec, unsigned int intsize,
              unsigned long *out_hwirq, unsigned int *out_type)
{
    if (WARN_ON(intsize < 1))
        return -EINVAL;

    *out_hwirq = evt2irq(intspec[0]);
    *out_type = IRQ_TYPE_NONE;

    return 0;
}

static const struct irq_domain_ops intc_evt_ops = {
    .xlate      = intc_evt_xlate,
};

void __init intc_irq_domain_init(struct intc_desc_int *d,
                 struct intc_hw_desc *hw)
{
    unsigned int irq_base, irq_end;

    /*
     * Quick linear revmap check
     */
    irq_base = evt2irq(hw->vectors[0].vect);
    irq_end = evt2irq(hw->vectors[hw->nr_vectors - 1].vect);

    /*
     * Linear domains have a hard-wired assertion that IRQs start at
     * 0 in order to make some performance optimizations. Lamely
     * restrict the linear case to these conditions here, taking the
     * tree penalty for linear cases with non-zero hwirq bases.
     */
    if (irq_base == 0 && irq_end == (irq_base + hw->nr_vectors - 1))
        d->domain = irq_domain_add_linear(NULL, hw->nr_vectors,
                          &intc_evt_ops, NULL);
    else
        d->domain = irq_domain_add_tree(NULL, &intc_evt_ops, NULL);

    BUG_ON(!d->domain);
}