7b1f62076b
Currently, whenever CONFIG_ARCH_USES_GETTIMEOFFSET is enabled, each arch core provides a single implementation of arch_gettimeoffset(). In many cases, different sub-architectures, different machines, or different timer providers exist, and so the arch ends up implementing arch_gettimeoffset() as a call-through-pointer anyway. Examples are ARM, Cris, M68K, and it's arguable that the remaining architectures, M32R and Blackfin, should be doing this anyway. Modify arch_gettimeoffset so that it itself is a function pointer, which the arch initializes. This will allow later changes to move the initialization of this function into individual machine support or timer drivers. This is particularly useful for code in drivers/clocksource which should rely on an arch-independant mechanism to register their implementation of arch_gettimeoffset(). This patch also converts the Cris architecture to set arch_gettimeoffset directly to the final implementation in time_init(), because Cris already had separate time_init() functions per sub-architecture. M68K and ARM are converted to set arch_gettimeoffset to the final implementation in later patches, because they already have function pointers in place for this purpose. Cc: Russell King <linux@arm.linux.org.uk> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
/*
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* linux/arch/cris/kernel/time.c
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*
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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* Copyright (C) 1999, 2000, 2001 Axis Communications AB
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*
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* 1994-07-02 Alan Modra
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* fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
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* 1995-03-26 Markus Kuhn
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* fixed 500 ms bug at call to set_rtc_mmss, fixed DS12887
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* precision CMOS clock update
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* 1996-05-03 Ingo Molnar
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* fixed time warps in do_[slow|fast]_gettimeoffset()
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* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
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* "A Kernel Model for Precision Timekeeping" by Dave Mills
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*
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* Linux/CRIS specific code:
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*
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* Authors: Bjorn Wesen
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* Johan Adolfsson
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*
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/param.h>
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#include <linux/jiffies.h>
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#include <linux/bcd.h>
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#include <linux/timex.h>
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#include <linux/init.h>
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#include <linux/profile.h>
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#include <linux/sched.h> /* just for sched_clock() - funny that */
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#define D(x)
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#define TICK_SIZE tick
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extern unsigned long loops_per_jiffy; /* init/main.c */
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unsigned long loops_per_usec;
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int set_rtc_mmss(unsigned long nowtime)
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{
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D(printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime));
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return 0;
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}
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/* grab the time from the RTC chip */
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unsigned long get_cmos_time(void)
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{
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return 0;
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}
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int update_persistent_clock(struct timespec now)
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{
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return set_rtc_mmss(now.tv_sec);
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}
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void read_persistent_clock(struct timespec *ts)
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{
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ts->tv_sec = 0;
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ts->tv_nsec = 0;
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}
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extern void cris_profile_sample(struct pt_regs* regs);
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void
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cris_do_profile(struct pt_regs* regs)
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{
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#ifdef CONFIG_SYSTEM_PROFILER
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cris_profile_sample(regs);
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#endif
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#ifdef CONFIG_PROFILING
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profile_tick(CPU_PROFILING);
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#endif
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}
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unsigned long long sched_clock(void)
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{
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return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +
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get_ns_in_jiffie();
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}
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static int
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__init init_udelay(void)
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{
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loops_per_usec = (loops_per_jiffy * HZ) / 1000000;
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return 0;
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}
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__initcall(init_udelay);
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