1 /* include/asm-parisc/rtc.h */
2
3 #ifndef _ASM_RTC_H
4 #define _ASM_RTC_H
5
6 #ifdef __KERNEL__
7
8 #include <linux/rtc.h>
9 #include <asm/errno.h>
10
11 #define RTC_PIE 0x40 /* periodic interrupt enable */
12 #define RTC_AIE 0x20 /* alarm interrupt enable */
13 #define RTC_UIE 0x10 /* update-finished interrupt enable */
14
15 #define RTC_BATT_BAD 0x100 /* battery bad */
16
17 /* some dummy definitions */
18 #define RTC_SQWE 0x08 /* enable square-wave output */
19 #define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */
20 #define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
21 #define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
22
23
24 /* constants for calculation */
25 #define SECS_PER_HOUR (60 * 60)
26 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
27
28 #define __isleap(year) \
29 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
30
31
32 /* How many days come before each month (0-12). */
33 static const unsigned short int __mon_yday[2][13] =
34 {
35 /* Normal years. */
36 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
37 /* Leap years. */
38 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
39 };
40
get_rtc_time(struct rtc_time * wtime)41 static inline unsigned int get_rtc_time(struct rtc_time *wtime)
42 {
43 /*
44 * Only the values that we read from the RTC are set. We leave
45 * tm_wday, tm_yday and tm_isdst untouched. Even though the
46 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
47 * by the RTC when initially set to a non-zero value.
48 */
49
50 struct pdc_tod tod_data;
51 long int days, rem, y;
52 const unsigned short int *ip;
53
54 if (pdc_tod_read(&tod_data) < 0)
55 return (RTC_24H | RTC_BATT_BAD);
56
57
58 // most of the remainder of this function is:
59 // Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc.
60 // This was originally a part of the GNU C Library.
61 // It is distributed under the GPL, and was swiped from offtime.c
62
63
64 days = tod_data.tod_sec / SECS_PER_DAY;
65 rem = tod_data.tod_sec % SECS_PER_DAY;
66
67 wtime->tm_hour = rem / SECS_PER_HOUR;
68 rem %= SECS_PER_HOUR;
69 wtime->tm_min = rem / 60;
70 wtime->tm_sec = rem % 60;
71
72 y = 1970;
73
74 #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
75 #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
76
77 while (days < 0 || days >= (__isleap (y) ? 366 : 365))
78 {
79 /* Guess a corrected year, assuming 365 days per year. */
80 long int yg = y + days / 365 - (days % 365 < 0);
81
82 /* Adjust DAYS and Y to match the guessed year. */
83 days -= ((yg - y) * 365
84 + LEAPS_THRU_END_OF (yg - 1)
85 - LEAPS_THRU_END_OF (y - 1));
86 y = yg;
87 }
88 wtime->tm_year = y - 1900;
89 #undef DIV
90 #undef LEAPS_THRU_END_OF
91
92 ip = __mon_yday[__isleap(y)];
93 for (y = 11; days < (long int) ip[y]; --y)
94 continue;
95 days -= ip[y];
96 wtime->tm_mon = y;
97 wtime->tm_mday = days + 1;
98
99 return (RTC_24H);
100 }
101
set_rtc_time(struct rtc_time * wtime)102 static inline int set_rtc_time(struct rtc_time *wtime)
103 {
104 u_int32_t secs;
105
106 secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday,
107 wtime->tm_hour, wtime->tm_min, wtime->tm_sec);
108
109 if (pdc_tod_set(secs, 0) < 0)
110 return -EINVAL;
111 else
112 return 0;
113 }
114
get_rtc_ss(void)115 static inline unsigned int get_rtc_ss(void)
116 {
117 return -EINVAL;
118 }
119
get_rtc_pll(struct rtc_pll_info * pll)120 static inline int get_rtc_pll(struct rtc_pll_info *pll)
121 {
122 return -EINVAL;
123 }
set_rtc_pll(struct rtc_pll_info * pll)124 static inline int set_rtc_pll(struct rtc_pll_info *pll)
125 {
126 return -EINVAL;
127 }
128
129 #endif /* __KERNEL__ */
130
131 #endif /* _ASM__RTC_H */
132
133