Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m68knommu/kernel/time.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds |
| 5 | * |
| 6 | * This file contains the m68k-specific time handling details. |
| 7 | * Most of the stuff is located in the machine specific files. |
| 8 | * |
| 9 | * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 |
| 10 | * "A Kernel Model for Precision Timekeeping" by Dave Mills |
| 11 | */ |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/errno.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/param.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/profile.h> |
| 21 | #include <linux/time.h> |
| 22 | #include <linux/timex.h> |
| 23 | |
| 24 | #include <asm/machdep.h> |
Greg Ungerer | 1f95e49 | 2007-02-07 11:35:29 +1000 | [diff] [blame] | 25 | #include <asm/irq_regs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | #define TICK_SIZE (tick_nsec / 1000) |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static inline int set_rtc_mmss(unsigned long nowtime) |
| 30 | { |
| 31 | if (mach_set_clock_mmss) |
| 32 | return mach_set_clock_mmss (nowtime); |
| 33 | return -1; |
| 34 | } |
| 35 | |
| 36 | /* |
| 37 | * timer_interrupt() needs to keep up the real-time clock, |
| 38 | * as well as call the "do_timer()" routine every clocktick |
| 39 | */ |
Greg Ungerer | 2f2c267 | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 40 | irqreturn_t arch_timer_interrupt(int irq, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | /* last time the cmos clock got updated */ |
| 43 | static long last_rtc_update=0; |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | write_seqlock(&xtime_lock); |
| 46 | |
Atsushi Nemoto | 3171a03 | 2006-09-29 02:00:32 -0700 | [diff] [blame] | 47 | do_timer(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #ifndef CONFIG_SMP |
Greg Ungerer | 1f95e49 | 2007-02-07 11:35:29 +1000 | [diff] [blame] | 49 | update_process_times(user_mode(get_irq_regs())); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #endif |
| 51 | if (current->pid) |
Greg Ungerer | ace5f1d | 2006-11-20 15:46:22 +1000 | [diff] [blame] | 52 | profile_tick(CPU_PROFILING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
| 55 | * If we have an externally synchronized Linux clock, then update |
| 56 | * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be |
| 57 | * called as close as possible to 500 ms before the new second starts. |
| 58 | */ |
john stultz | b149ee2 | 2005-09-06 15:17:46 -0700 | [diff] [blame] | 59 | if (ntp_synced() && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | xtime.tv_sec > last_rtc_update + 660 && |
| 61 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && |
| 62 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { |
| 63 | if (set_rtc_mmss(xtime.tv_sec) == 0) |
| 64 | last_rtc_update = xtime.tv_sec; |
| 65 | else |
| 66 | last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */ |
| 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | write_sequnlock(&xtime_lock); |
| 70 | return(IRQ_HANDLED); |
| 71 | } |
| 72 | |
| 73 | void time_init(void) |
| 74 | { |
| 75 | unsigned int year, mon, day, hour, min, sec; |
| 76 | |
Greg Ungerer | 2f2c267 | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 77 | if (mach_gettod) |
| 78 | mach_gettod(&year, &mon, &day, &hour, &min, &sec); |
| 79 | else |
| 80 | year = mon = day = hour = min = sec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | if ((year += 1900) < 1970) |
| 83 | year += 100; |
| 84 | xtime.tv_sec = mktime(year, mon, day, hour, min, sec); |
| 85 | xtime.tv_nsec = 0; |
| 86 | wall_to_monotonic.tv_sec = -xtime.tv_sec; |
| 87 | |
Greg Ungerer | 2f2c267 | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 88 | hw_timer_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |