[PATCH] ARM: Generic Dynamic Tick Timer support for ARM, take 4
[linux-2.6.git] / arch / arm / kernel / irq.c
index ff187f4..395137a 100644 (file)
@@ -4,6 +4,10 @@
  *  Copyright (C) 1992 Linus Torvalds
  *  Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
  *
+ *  Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
+ *  Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
+ *  Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
@@ -37,6 +41,7 @@
 #include <asm/irq.h>
 #include <asm/system.h>
 #include <asm/mach/irq.h>
+#include <asm/mach/time.h>
 
 /*
  * Maximum IRQ count.  Currently, this is arbitary.  However, it should
@@ -329,6 +334,15 @@ __do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
 
        spin_unlock(&irq_controller_lock);
 
+#ifdef CONFIG_NO_IDLE_HZ
+       if (!(action->flags & SA_TIMER) && system_timer->dyn_tick != NULL) {
+               write_seqlock(&xtime_lock);
+               if (system_timer->dyn_tick->state & DYN_TICK_ENABLED)
+                       system_timer->dyn_tick->handler(irq, 0, regs);
+               write_sequnlock(&xtime_lock);
+       }
+#endif
+
        if (!(action->flags & SA_INTERRUPT))
                local_irq_enable();