projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 8531a35e KK |
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 | ||
| 866d7f56 RB |
17 | #include <linux/clockchips.h> |
| 18 | #include <asm/time.h> | |
| 19 | ||
| 8531a35e KK |
20 | DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device); |
| 21 | ||
| 22 | void mips_event_handler(struct clock_event_device *dev); | |
| 23 | int c0_compare_int_usable(void); | |
| 24 | void mips_set_clock_mode(enum clock_event_mode, struct clock_event_device *); | |
| 25 | irqreturn_t c0_compare_interrupt(int, void *); | |
| 26 | ||
| 27 | extern struct irqaction c0_compare_irqaction; | |
| 28 | extern int cp0_timer_irq_installed; | |
| 29 | ||
| 30 | /* | |
| 31 | * Possibly handle a performance counter interrupt. | |
| 32 | * Return true if the timer interrupt should not be checked | |
| 33 | */ | |
| 34 | ||
| 35 | static inline int handle_perf_irq(int r2) | |
| 36 | { | |
| 37 | /* | |
| 38 | * The performance counter overflow interrupt may be shared with the | |
| 39 | * timer interrupt (cp0_perfcount_irq < 0). If it is and a | |
| 40 | * performance counter has overflowed (perf_irq() == IRQ_HANDLED) | |
| 41 | * and we can't reliably determine if a counter interrupt has also | |
| 42 | * happened (!r2) then don't check for a timer interrupt. | |
| 43 | */ | |
| 44 | return (cp0_perfcount_irq < 0) && | |
| 45 | perf_irq() == IRQ_HANDLED && | |
| 46 | !r2; | |
| 47 | } | |
| 48 | ||
| 49 | #endif /* __ASM_CEVT_R4K_H */ |