Release 4.18 arch/mips/kernel/time.c

/*
 * Copyright 2001 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 * Copyright (c) 2003, 2004  Maciej W. Rozycki
 *
 * Common time service routines for MIPS machines.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/bug.h>
#include <linux/clockchips.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/param.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/export.h>

#include <asm/cpu-features.h>
#include <asm/cpu-type.h>
#include <asm/div64.h>
#include <asm/time.h>

/*
 * forward reference
 */
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);



static int null_perf_irq(void)
{
	return 0;
}

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3
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int (*perf_irq)(void) = null_perf_irq;

EXPORT_SYMBOL(perf_irq);

/*
 * time_init() - it does the following things.
 *
 * 1) plat_time_init() -
 *      a) (optional) set up RTC routines,
 *      b) (optional) calibrate and set the mips_hpt_frequency
 *          (only needed if you intended to use cpu counter as timer interrupt
 *           source)
 * 2) calculate a couple of cached variables for later usage
 */


unsigned int mips_hpt_frequency;
EXPORT_SYMBOL_GPL(mips_hpt_frequency);



static __init int cpu_has_mfc0_count_bug(void)
{
	switch (current_cpu_type()) {
	case CPU_R4000PC:
	case CPU_R4000SC:
	case CPU_R4000MC:
		/*
                 * V3.0 is documented as suffering from the mfc0 from count bug.
                 * Afaik this is the last version of the R4000.  Later versions
                 * were marketed as R4400.
                 */
		return 1;

	case CPU_R4400PC:
	case CPU_R4400SC:
	case CPU_R4400MC:
		/*
                 * The published errata for the R4400 up to 3.0 say the CPU
                 * has the mfc0 from count bug.
                 */
		if ((current_cpu_data.processor_id & 0xff) <= 0x30)
			return 1;

		/*
                 * we assume newer revisions are ok
                 */
		return 0;
	}

	return 0;
}

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47
77.05%
2
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Linus Torvalds (pre-git)
8
13.11%
4
40.00%
Thomas Bogendoerfer
2
3.28%
1
10.00%
Atsushi Nemoto
2
3.28%
1
10.00%
Linus Torvalds
1
1.64%
1
10.00%
Lucas De Marchi
1
1.64%
1
10.00%
Total
61
100.00%
10
100.00%



void __init time_init(void)
{
	plat_time_init();

	/*
         * The use of the R4k timer as a clock event takes precedence;
         * if reading the Count register might interfere with the timer
         * interrupt, then we don't use the timer as a clock source.
         * We may still use the timer as a clock source though if the
         * timer interrupt isn't reliable; the interference doesn't
         * matter then, because we don't use the interrupt.
         */
	if (mips_clockevent_init() != 0 || !cpu_has_mfc0_count_bug())
		init_mips_clocksource();
}
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Atsushi Nemoto
5
19.23%
3
37.50%
Maciej W. Rozycki
3
11.54%
1
12.50%
Linus Torvalds
2
7.69%
1
12.50%
Andrew Morton
1
3.85%
1
12.50%
Linus Torvalds (pre-git)
1
3.85%
1
12.50%
Total
26
100.00%
8
100.00%

Overall Contributors
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CommitProp
Ralf Bächle
112
60.87%
10
37.04%
Linus Torvalds (pre-git)
30
16.30%
5
18.52%
Linus Torvalds
13
7.07%
1
3.70%
Atsushi Nemoto
7
3.80%
3
11.11%
Andrew Morton
7
3.80%
1
3.70%
James Hogan
5
2.72%
1
3.70%
Maciej W. Rozycki
3
1.63%
1
3.70%
Thomas Bogendoerfer
2
1.09%
1
3.70%
David Howells
2
1.09%
1
3.70%
Paul Gortmaker
1
0.54%
1
3.70%
Dmitri Vorobiev
1
0.54%
1
3.70%
Lucas De Marchi
1
0.54%
1
3.70%
Total
184
100.00%
27
100.00%
Directory: arch/mips/kernel

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