kernel/arch/powerpc/platforms/pseries/event_sources.c

   1 /*
   2  * Copyright (C) 2001 Dave Engebretsen IBM Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  */
  18
  19 #include <asm/prom.h>
  20
  21 #include "pseries.h"
  22
  23 void request_event_sources_irqs(struct device_node *np,
  24                                 irq_handler_t handler,
  25                                 const char *name)
  26 {
  27         int i, index, count = 0;
  28         struct of_phandle_args oirq;
  29         const u32 *opicprop;
  30         unsigned int opicplen;
  31         unsigned int virqs[16];
  32
  33         /* Check for obsolete "open-pic-interrupt" property. If present, then
  34          * map those interrupts using the default interrupt host and default
  35          * trigger
  36          */
  37         opicprop = of_get_property(np, "open-pic-interrupt", &opicplen);
  38         if (opicprop) {
  39                 opicplen /= sizeof(u32);
  40                 for (i = 0; i < opicplen; i++) {
  41                         if (count > 15)
  42                                 break;
  43                         virqs[count] = irq_create_mapping(NULL, *(opicprop++));
  44                         if (virqs[count] == NO_IRQ) {
  45                                 pr_err("event-sources: Unable to allocate "
  46                                        "interrupt number for %s\n",
  47                                        np->full_name);
  48                                 WARN_ON(1);
  49                         }
  50                         else
  51                                 count++;
  52
  53                 }
  54         }
  55         /* Else use normal interrupt tree parsing */
  56         else {
  57                 /* First try to do a proper OF tree parsing */
  58                 for (index = 0; of_irq_parse_one(np, index, &oirq) == 0;
  59                      index++) {
  60                         if (count > 15)
  61                                 break;
  62                         virqs[count] = irq_create_of_mapping(&oirq);
  63                         if (virqs[count] == NO_IRQ) {
  64                                 pr_err("event-sources: Unable to allocate "
  65                                        "interrupt number for %s\n",
  66                                        np->full_name);
  67                                 WARN_ON(1);
  68                         }
  69                         else
  70                                 count++;
  71                 }
  72         }
  73
  74         /* Now request them */
  75         for (i = 0; i < count; i++) {
  76                 if (request_irq(virqs[i], handler, 0, name, NULL)) {
  77                         pr_err("event-sources: Unable to request interrupt "
  78                                "%d for %s\n", virqs[i], np->full_name);
  79                         WARN_ON(1);
  80                         return;
  81                 }
  82         }
  83 }
  84