arch/ia64/sn/kernel/sn2/timer_interrupt.c

   1 /*
   2  *
   3  *
   4  * Copyright (c) 2005, 2006 Silicon Graphics, Inc.  All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  *
  14  * Further, this software is distributed without any warranty that it is
  15  * free of the rightful claim of any third person regarding infringement
  16  * or the like.  Any license provided herein, whether implied or
  17  * otherwise, applies only to this software file.  Patent licenses, if
  18  * any, provided herein do not apply to combinations of this program with
  19  * other software, or any other product whatsoever.
  20  *
  21  * You should have received a copy of the GNU General Public
  22  * License along with this program; if not, write the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  24  *
  25  * For further information regarding this notice, see:
  26  *
  27  * http://oss.sgi.com/projects/GenInfo/NoticeExplan
  28  */
  29
  30 #include <linux/interrupt.h>
  31 #include <asm/sn/pda.h>
  32 #include <asm/sn/leds.h>
  33
  34 extern void sn_lb_int_war_check(void);
  35 extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  36
  37 #define SN_LB_INT_WAR_INTERVAL 100
  38
  39 void sn_timer_interrupt(int irq, void *dev_id)
  40 {
  41         /* LED blinking */
  42         if (!pda->hb_count--) {
  43                 pda->hb_count = HZ / 2;
  44                 set_led_bits(pda->hb_state ^=
  45                              LED_CPU_HEARTBEAT, LED_CPU_HEARTBEAT);
  46         }
  47
  48         if (is_shub1()) {
  49                 if (enable_shub_wars_1_1()) {
  50                         /* Bugfix code for SHUB 1.1 */
  51                         if (pda->pio_shub_war_cam_addr)
  52                                 *pda->pio_shub_war_cam_addr = 0x8000000000000010UL;
  53                 }
  54                 if (pda->sn_lb_int_war_ticks == 0)
  55                         sn_lb_int_war_check();
  56                 pda->sn_lb_int_war_ticks++;
  57                 if (pda->sn_lb_int_war_ticks >= SN_LB_INT_WAR_INTERVAL)
  58                         pda->sn_lb_int_war_ticks = 0;
  59         }
  60 }