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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2008 Kevin D. Kissell
*/
/*
* Definitions used for common event timer implementation
* for MIPS 4K-type processors and their MIPS MT variants.
* Avoids unsightly extern declarations in C files.
*/
#ifndef __ASM_CEVT_R4K_H
#define __ASM_CEVT_R4K_H
#include <linux/clockchips.h>
#include <asm/time.h>
DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device);
void mips_event_handler(struct clock_event_device *dev);
int c0_compare_int_usable(void);
void mips_set_clock_mode(enum clock_event_mode, struct clock_event_device *);
irqreturn_t c0_compare_interrupt(int, void *);
extern struct irqaction c0_compare_irqaction;
extern int cp0_timer_irq_installed;
/*
* Possibly handle a performance counter interrupt.
* Return true if the timer interrupt should not be checked
*/
static inline int handle_perf_irq(int r2)
{
/*
* The performance counter overflow interrupt may be shared with the
* timer interrupt (cp0_perfcount_irq < 0). If it is and a
* performance counter has overflowed (perf_irq() == IRQ_HANDLED)
* and we can't reliably determine if a counter interrupt has also
* happened (!r2) then don't check for a timer interrupt.
*/
return (cp0_perfcount_irq < 0) &&
perf_irq() == IRQ_HANDLED &&
!r2;
}
#endif /* __ASM_CEVT_R4K_H */