event_sources.c

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/*
 * Copyright (C) 2001 Dave Engebretsen 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <asm/prom.h>

#include "pseries.h"

void request_event_sources_irqs(struct device_node *np,
                irq_handler_t handler,
                const char *name)
{
    int i, index, count = 0;
    struct of_irq oirq;
    const u32 *opicprop;
    unsigned int opicplen;
    unsigned int virqs[16];

    /* Check for obsolete "open-pic-interrupt" property. If present, then
     * map those interrupts using the default interrupt host and default
     * trigger
     */
    opicprop = of_get_property(np, "open-pic-interrupt", &opicplen);
    if (opicprop) {
        opicplen /= sizeof(u32);
        for (i = 0; i < opicplen; i++) {
            if (count > 15)
                break;
            virqs[count] = irq_create_mapping(NULL, *(opicprop++));
            if (virqs[count] == NO_IRQ) {
                pr_err("event-sources: Unable to allocate "
                       "interrupt number for %s\n",
                       np->full_name);
                WARN_ON(1);
            }
            else
                count++;

        }
    }
    /* Else use normal interrupt tree parsing */
    else {
        /* First try to do a proper OF tree parsing */
        for (index = 0; of_irq_map_one(np, index, &oirq) == 0;
             index++) {
            if (count > 15)
                break;
            virqs[count] = irq_create_of_mapping(oirq.controller,
                                oirq.specifier,
                                oirq.size);
            if (virqs[count] == NO_IRQ) {
                pr_err("event-sources: Unable to allocate "
                       "interrupt number for %s\n",
                       np->full_name);
                WARN_ON(1);
            }
            else
                count++;
        }
    }

    /* Now request them */
    for (i = 0; i < count; i++) {
        if (request_irq(virqs[i], handler, 0, name, NULL)) {
            pr_err("event-sources: Unable to request interrupt "
                   "%d for %s\n", virqs[i], np->full_name);
            WARN_ON(1);
            return;
        }
    }
}