cregit-Linux how code gets into the kernel

Release 4.8 arch/mips/kernel/time.c

Directory: arch/mips/kernel
/*
 * 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);




int __weak rtc_mips_set_time(unsigned long sec)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git646.15%133.33%


linus torvaldslinus torvalds538.46%133.33%


ralf baechleralf baechle215.38%133.33%


Total13100.00%3100.00%






int __weak rtc_mips_set_mmss(unsigned long nowtime)
{
	return rtc_mips_set_time(nowtime);
}


Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle1062.50%133.33%


andrew mortonandrew morton531.25%133.33%


yoichi yuasayoichi yuasa16.25%133.33%


Total16100.00%3100.00%






int update_persistent_clock(struct timespec now)
{
	return rtc_mips_set_mmss(now.tv_sec);
}


Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle17100.00%1100.00%


Total17100.00%1100.00%






static int null_perf_irq(void)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle981.82%133.33%


dmitri vorobievdmitri vorobiev19.09%133.33%


david howellsdavid howells19.09%133.33%


Total11100.00%3100.00%




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;

/*
 * This function exists in order to cause an error due to a duplicate
 * definition if platform code should have its own implementation.  The hook
 * to use instead is plat_time_init.  plat_time_init does not receive the
 * irqaction pointer argument anymore.  This is because any function which
 * initializes an interrupt timer now takes care of its own request_irq rsp.
 * setup_irq calls and each clock_event_device should use its own
 * struct irqrequest.
 */



void __init plat_timer_setup(void)
{
	BUG();
}


Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle981.82%360.00%


andrew mortonandrew morton19.09%120.00%


atsushi nemotoatsushi nemoto19.09%120.00%


Total11100.00%5100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle4777.05%220.00%


pre-gitpre-git813.11%440.00%


thomas bogendoerferthomas bogendoerfer23.28%110.00%


atsushi nemotoatsushi nemoto23.28%110.00%


linus torvaldslinus torvalds11.64%110.00%


lucas de marchilucas de marchi11.64%110.00%


Total61100.00%10100.00%






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();
}

Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle1453.85%112.50%


atsushi nemotoatsushi nemoto519.23%337.50%


maciej w. rozyckimaciej w. rozycki311.54%112.50%


linus torvaldslinus torvalds27.69%112.50%


pre-gitpre-git13.85%112.50%


andrew mortonandrew morton13.85%112.50%


Total26100.00%8100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
ralf baechleralf baechle15163.71%1241.38%


pre-gitpre-git3615.19%517.24%


linus torvaldslinus torvalds187.59%13.45%


andrew mortonandrew morton135.49%13.45%


atsushi nemotoatsushi nemoto83.38%310.34%


maciej w. rozyckimaciej w. rozycki31.27%13.45%


thomas bogendoerferthomas bogendoerfer20.84%13.45%


david howellsdavid howells20.84%13.45%


dmitri vorobievdmitri vorobiev10.42%13.45%


yoichi yuasayoichi yuasa10.42%13.45%


lucas de marchilucas de marchi10.42%13.45%


paul gortmakerpaul gortmaker10.42%13.45%


Total237100.00%29100.00%

  
Directory: arch/mips/kernel



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