tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/clockchips.h>
18#include <asm/time.h>
19
20DECLARE_PER_CPU(struct clock_event_device, mips_clockevent_device);
21
22void mips_event_handler(struct clock_event_device *dev);
23int c0_compare_int_usable(void);
24void mips_set_clock_mode(enum clock_event_mode, struct clock_event_device *);
25irqreturn_t c0_compare_interrupt(int, void *);
26
27extern struct irqaction c0_compare_irqaction;
28extern 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
35static 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 */