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_irq 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                                 printk(KERN_ERR "Unable to allocate interrupt "
  46                                        "number for %s\n", np->full_name);
  47                         else
  48                                 count++;
  49
  50                 }
  51         }
  52         /* Else use normal interrupt tree parsing */
  53         else {
  54                 /* First try to do a proper OF tree parsing */
  55                 for (index = 0; of_irq_map_one(np, index, &oirq) == 0;
  56                      index++) {
  57                         if (count > 15)
  58                                 break;
  59                         virqs[count] = irq_create_of_mapping(oirq.controller,
  60                                                             oirq.specifier,
  61                                                             oirq.size);
  62                         if (virqs[count] == NO_IRQ)
  63                                 printk(KERN_ERR "Unable to allocate interrupt "
  64                                        "number for %s\n", np->full_name);
  65                         else
  66                                 count++;
  67                 }
  68         }
  69
  70         /* Now request them */
  71         for (i = 0; i < count; i++) {
  72                 if (request_irq(virqs[i], handler, 0, name, NULL)) {
  73                         printk(KERN_ERR "Unable to request interrupt %d for "
  74                                "%s\n", virqs[i], np->full_name);
  75                         return;
  76                 }
  77         }
  78 }
  79