diff options
Diffstat (limited to 'include/asm-i386/mach-default/mach_time.h')
-rw-r--r-- | include/asm-i386/mach-default/mach_time.h | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/include/asm-i386/mach-default/mach_time.h b/include/asm-i386/mach-default/mach_time.h deleted file mode 100644 index 31eb5de6f3dc..000000000000 --- a/include/asm-i386/mach-default/mach_time.h +++ /dev/null | |||
@@ -1,111 +0,0 @@ | |||
1 | /* | ||
2 | * include/asm-i386/mach-default/mach_time.h | ||
3 | * | ||
4 | * Machine specific set RTC function for generic. | ||
5 | * Split out from time.c by Osamu Tomita <tomita@cinet.co.jp> | ||
6 | */ | ||
7 | #ifndef _MACH_TIME_H | ||
8 | #define _MACH_TIME_H | ||
9 | |||
10 | #include <linux/mc146818rtc.h> | ||
11 | |||
12 | /* for check timing call set_rtc_mmss() 500ms */ | ||
13 | /* used in arch/i386/time.c::do_timer_interrupt() */ | ||
14 | #define USEC_AFTER 500000 | ||
15 | #define USEC_BEFORE 500000 | ||
16 | |||
17 | /* | ||
18 | * In order to set the CMOS clock precisely, set_rtc_mmss has to be | ||
19 | * called 500 ms after the second nowtime has started, because when | ||
20 | * nowtime is written into the registers of the CMOS clock, it will | ||
21 | * jump to the next second precisely 500 ms later. Check the Motorola | ||
22 | * MC146818A or Dallas DS12887 data sheet for details. | ||
23 | * | ||
24 | * BUG: This routine does not handle hour overflow properly; it just | ||
25 | * sets the minutes. Usually you'll only notice that after reboot! | ||
26 | */ | ||
27 | static inline int mach_set_rtc_mmss(unsigned long nowtime) | ||
28 | { | ||
29 | int retval = 0; | ||
30 | int real_seconds, real_minutes, cmos_minutes; | ||
31 | unsigned char save_control, save_freq_select; | ||
32 | |||
33 | save_control = CMOS_READ(RTC_CONTROL); /* tell the clock it's being set */ | ||
34 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | ||
35 | |||
36 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); /* stop and reset prescaler */ | ||
37 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | ||
38 | |||
39 | cmos_minutes = CMOS_READ(RTC_MINUTES); | ||
40 | if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | ||
41 | BCD_TO_BIN(cmos_minutes); | ||
42 | |||
43 | /* | ||
44 | * since we're only adjusting minutes and seconds, | ||
45 | * don't interfere with hour overflow. This avoids | ||
46 | * messing with unknown time zones but requires your | ||
47 | * RTC not to be off by more than 15 minutes | ||
48 | */ | ||
49 | real_seconds = nowtime % 60; | ||
50 | real_minutes = nowtime / 60; | ||
51 | if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) | ||
52 | real_minutes += 30; /* correct for half hour time zone */ | ||
53 | real_minutes %= 60; | ||
54 | |||
55 | if (abs(real_minutes - cmos_minutes) < 30) { | ||
56 | if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { | ||
57 | BIN_TO_BCD(real_seconds); | ||
58 | BIN_TO_BCD(real_minutes); | ||
59 | } | ||
60 | CMOS_WRITE(real_seconds,RTC_SECONDS); | ||
61 | CMOS_WRITE(real_minutes,RTC_MINUTES); | ||
62 | } else { | ||
63 | printk(KERN_WARNING | ||
64 | "set_rtc_mmss: can't update from %d to %d\n", | ||
65 | cmos_minutes, real_minutes); | ||
66 | retval = -1; | ||
67 | } | ||
68 | |||
69 | /* The following flags have to be released exactly in this order, | ||
70 | * otherwise the DS12887 (popular MC146818A clone with integrated | ||
71 | * battery and quartz) will not reset the oscillator and will not | ||
72 | * update precisely 500 ms later. You won't find this mentioned in | ||
73 | * the Dallas Semiconductor data sheets, but who believes data | ||
74 | * sheets anyway ... -- Markus Kuhn | ||
75 | */ | ||
76 | CMOS_WRITE(save_control, RTC_CONTROL); | ||
77 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | ||
78 | |||
79 | return retval; | ||
80 | } | ||
81 | |||
82 | static inline unsigned long mach_get_cmos_time(void) | ||
83 | { | ||
84 | unsigned int year, mon, day, hour, min, sec; | ||
85 | |||
86 | do { | ||
87 | sec = CMOS_READ(RTC_SECONDS); | ||
88 | min = CMOS_READ(RTC_MINUTES); | ||
89 | hour = CMOS_READ(RTC_HOURS); | ||
90 | day = CMOS_READ(RTC_DAY_OF_MONTH); | ||
91 | mon = CMOS_READ(RTC_MONTH); | ||
92 | year = CMOS_READ(RTC_YEAR); | ||
93 | } while (sec != CMOS_READ(RTC_SECONDS)); | ||
94 | |||
95 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { | ||
96 | BCD_TO_BIN(sec); | ||
97 | BCD_TO_BIN(min); | ||
98 | BCD_TO_BIN(hour); | ||
99 | BCD_TO_BIN(day); | ||
100 | BCD_TO_BIN(mon); | ||
101 | BCD_TO_BIN(year); | ||
102 | } | ||
103 | |||
104 | year += 1900; | ||
105 | if (year < 1970) | ||
106 | year += 100; | ||
107 | |||
108 | return mktime(year, mon, day, hour, min, sec); | ||
109 | } | ||
110 | |||
111 | #endif /* !_MACH_TIME_H */ | ||