release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/include/asm/cevt-r4k.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Kevin D. Kissell
   7  */
   8
   9 /*
  10  * Definitions used for common event timer implementation
  11  * for MIPS 4K-type processors and their MIPS MT variants.
  12  * Avoids unsightly extern declarations in C files.
  13  */
  14 #ifndef __ASM_CEVT_R4K_H
  15 #define __ASM_CEVT_R4K_H
  16
  17 DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device);
  18
  19 void mips_event_handler(struct clock_event_device *dev);
  20 int c0_compare_int_usable(void);
  21 void mips_set_clock_mode(enum clock_event_mode, struct clock_event_device *);
  22 irqreturn_t c0_compare_interrupt(int, void *);
  23
  24 extern struct irqaction c0_compare_irqaction;
  25 extern int cp0_timer_irq_installed;
  26
  27 /*
  28  * Possibly handle a performance counter interrupt.
  29  * Return true if the timer interrupt should not be checked
  30  */
  31
  32 static inline int handle_perf_irq(int r2)
  33 {
  34         /*
  35          * The performance counter overflow interrupt may be shared with the
  36          * timer interrupt (cp0_perfcount_irq < 0). If it is and a
  37          * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
  38          * and we can't reliably determine if a counter interrupt has also
  39          * happened (!r2) then don't check for a timer interrupt.
  40          */
  41         return (cp0_perfcount_irq < 0) &&
  42                 perf_irq() == IRQ_HANDLED &&
  43                 !r2;
  44 }
  45
  46 #endif /* __ASM_CEVT_R4K_H */