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Diffstat (limited to 'arch/arm26/kernel/time.c')
| -rw-r--r-- | arch/arm26/kernel/time.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/arch/arm26/kernel/time.c b/arch/arm26/kernel/time.c deleted file mode 100644 index 0f1d57fbd3d..00000000000 --- a/arch/arm26/kernel/time.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * linux/arch/arm26/kernel/time.c - * - * Copyright (C) 1991, 1992, 1995 Linus Torvalds - * Modifications for ARM (C) 1994-2001 Russell King - * Mods for ARM26 (C) 2003 Ian Molton - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This file contains the ARM-specific time handling details: - * reading the RTC at bootup, etc... - * - * 1994-07-02 Alan Modra - * fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime - * 1998-12-20 Updated NTP code according to technical memorandum Jan '96 - * "A Kernel Model for Precision Timekeeping" by Dave Mills - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/timex.h> -#include <linux/errno.h> -#include <linux/profile.h> - -#include <asm/hardware.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/ioc.h> - -/* this needs a better home */ -DEFINE_SPINLOCK(rtc_lock); - -/* change this if you have some constant time drift */ -#define USECS_PER_JIFFY (1000000/HZ) - -static int dummy_set_rtc(void) -{ - return 0; -} - -/* - * hook for setting the RTC's idea of the current time. - */ -int (*set_rtc)(void) = dummy_set_rtc; - -/* - * Get time offset based on IOCs timer. - * FIXME - if this is called with interrutps off, why the shennanigans - * below ? - */ -static unsigned long gettimeoffset(void) -{ - unsigned int count1, count2, status; - long offset; - - ioc_writeb (0, IOC_T0LATCH); - barrier (); - count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8); - barrier (); - status = ioc_readb(IOC_IRQREQA); - barrier (); - ioc_writeb (0, IOC_T0LATCH); - barrier (); - count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8); - - offset = count2; - if (count2 < count1) { - /* - * We have not had an interrupt between reading count1 - * and count2. - */ - if (status & (1 << 5)) - offset -= LATCH; - } else if (count2 > count1) { - /* - * We have just had another interrupt between reading - * count1 and count2. - */ - offset -= LATCH; - } - - offset = (LATCH - offset) * (tick_nsec / 1000); - return (offset + LATCH/2) / LATCH; -} - -static unsigned long next_rtc_update; - -/* - * If we have an externally synchronized linux clock, then update - * CMOS clock accordingly every ~11 minutes. set_rtc() has to be - * called as close as possible to 500 ms before the new second - * starts. - */ -static inline void do_set_rtc(void) -{ - if (!ntp_synced() || set_rtc == NULL) - return; - -//FIXME - timespec.tv_sec is a time_t not unsigned long - if (next_rtc_update && - time_before((unsigned long)xtime.tv_sec, next_rtc_update)) - return; - - if (xtime.tv_nsec < 500000000 - ((unsigned) tick_nsec >> 1) && - xtime.tv_nsec >= 500000000 + ((unsigned) tick_nsec >> 1)) - return; - - if (set_rtc()) - /* - * rtc update failed. Try again in 60s - */ - next_rtc_update = xtime.tv_sec + 60; - else - next_rtc_update = xtime.tv_sec + 660; -} - -#define do_leds() - -void do_gettimeofday(struct timeval *tv) -{ - unsigned long flags; - unsigned long seq; - unsigned long usec, sec; - - do { - seq = read_seqbegin_irqsave(&xtime_lock, flags); - usec = gettimeoffset(); - sec = xtime.tv_sec; - usec += xtime.tv_nsec / 1000; - } while (read_seqretry_irqrestore(&xtime_lock, seq, flags)); - - /* usec may have gone up a lot: be safe */ - while (usec >= 1000000) { - usec -= 1000000; - sec++; - } - - tv->tv_sec = sec; - tv->tv_usec = usec; -} - -EXPORT_SYMBOL(do_gettimeofday); - -int do_settimeofday(struct timespec *tv) -{ - if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) - return -EINVAL; - - write_seqlock_irq(&xtime_lock); - /* - * This is revolting. We need to set "xtime" correctly. However, the - * value in this location is the value at the most recent update of - * wall time. Discover what correction gettimeofday() would have - * done, and then undo it! - */ - tv->tv_nsec -= 1000 * gettimeoffset(); - - while (tv->tv_nsec < 0) { - tv->tv_nsec += NSEC_PER_SEC; - tv->tv_sec--; - } - - xtime.tv_sec = tv->tv_sec; - xtime.tv_nsec = tv->tv_nsec; - ntp_clear(); - write_sequnlock_irq(&xtime_lock); - clock_was_set(); - return 0; -} - -EXPORT_SYMBOL(do_settimeofday); - -static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - do_timer(1); -#ifndef CONFIG_SMP - update_process_times(user_mode(regs)); -#endif - do_set_rtc(); //FIME - EVERY timer IRQ? - profile_tick(CPU_PROFILING, regs); - return IRQ_HANDLED; //FIXME - is this right? -} - -static struct irqaction timer_irq = { - .name = "timer", - .flags = IRQF_DISABLED, - .handler = timer_interrupt, -}; - -extern void ioctime_init(void); - -/* - * Set up timer interrupt. - */ -void __init time_init(void) -{ - ioc_writeb(LATCH & 255, IOC_T0LTCHL); - ioc_writeb(LATCH >> 8, IOC_T0LTCHH); - ioc_writeb(0, IOC_T0GO); - - - setup_irq(IRQ_TIMER, &timer_irq); -} - |