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1da177e4 LT |
1 | /* |
2 | * inclue/asm-parisc/rtc.h | |
3 | * | |
4 | * Copyright 2002 Randolph CHung <tausq@debian.org> | |
5 | * | |
6 | * Based on: include/asm-ppc/rtc.h and the genrtc driver in the | |
7 | * 2.4 parisc linux tree | |
8 | */ | |
9 | ||
10 | #ifndef __ASM_RTC_H__ | |
11 | #define __ASM_RTC_H__ | |
12 | ||
13 | #ifdef __KERNEL__ | |
14 | ||
15 | #include <linux/rtc.h> | |
16 | ||
17 | #include <asm/pdc.h> | |
18 | ||
19 | #define SECS_PER_HOUR (60 * 60) | |
20 | #define SECS_PER_DAY (SECS_PER_HOUR * 24) | |
21 | ||
22 | ||
23 | #define RTC_PIE 0x40 /* periodic interrupt enable */ | |
24 | #define RTC_AIE 0x20 /* alarm interrupt enable */ | |
25 | #define RTC_UIE 0x10 /* update-finished interrupt enable */ | |
26 | ||
27 | #define RTC_BATT_BAD 0x100 /* battery bad */ | |
28 | ||
29 | /* some dummy definitions */ | |
30 | #define RTC_SQWE 0x08 /* enable square-wave output */ | |
31 | #define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ | |
32 | #define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ | |
33 | #define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ | |
34 | ||
35 | # define __isleap(year) \ | |
36 | ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) | |
37 | ||
38 | /* How many days come before each month (0-12). */ | |
39 | static const unsigned short int __mon_yday[2][13] = | |
40 | { | |
41 | /* Normal years. */ | |
42 | { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, | |
43 | /* Leap years. */ | |
44 | { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } | |
45 | }; | |
46 | ||
47 | static inline unsigned int get_rtc_time(struct rtc_time *wtime) | |
48 | { | |
49 | struct pdc_tod tod_data; | |
50 | long int days, rem, y; | |
51 | const unsigned short int *ip; | |
52 | ||
53 | if(pdc_tod_read(&tod_data) < 0) | |
54 | return RTC_24H | RTC_BATT_BAD; | |
55 | ||
56 | ||
57 | // most of the remainder of this function is: | |
58 | // Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc. | |
59 | // This was originally a part of the GNU C Library. | |
60 | // It is distributed under the GPL, and was swiped from offtime.c | |
61 | ||
62 | ||
63 | days = tod_data.tod_sec / SECS_PER_DAY; | |
64 | rem = tod_data.tod_sec % SECS_PER_DAY; | |
65 | ||
66 | wtime->tm_hour = rem / SECS_PER_HOUR; | |
67 | rem %= SECS_PER_HOUR; | |
68 | wtime->tm_min = rem / 60; | |
69 | wtime->tm_sec = rem % 60; | |
70 | ||
71 | y = 1970; | |
72 | ||
73 | #define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) | |
74 | #define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) | |
75 | ||
76 | while (days < 0 || days >= (__isleap (y) ? 366 : 365)) | |
77 | { | |
78 | /* Guess a corrected year, assuming 365 days per year. */ | |
79 | long int yg = y + days / 365 - (days % 365 < 0); | |
80 | ||
81 | /* Adjust DAYS and Y to match the guessed year. */ | |
82 | days -= ((yg - y) * 365 | |
83 | + LEAPS_THRU_END_OF (yg - 1) | |
84 | - LEAPS_THRU_END_OF (y - 1)); | |
85 | y = yg; | |
86 | } | |
87 | wtime->tm_year = y - 1900; | |
88 | ||
89 | ip = __mon_yday[__isleap(y)]; | |
90 | for (y = 11; days < (long int) ip[y]; --y) | |
91 | continue; | |
92 | days -= ip[y]; | |
93 | wtime->tm_mon = y; | |
94 | wtime->tm_mday = days + 1; | |
95 | ||
96 | return RTC_24H; | |
97 | } | |
98 | ||
99 | static int set_rtc_time(struct rtc_time *wtime) | |
100 | { | |
101 | u_int32_t secs; | |
102 | ||
103 | secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday, | |
104 | wtime->tm_hour, wtime->tm_min, wtime->tm_sec); | |
105 | ||
106 | if(pdc_tod_set(secs, 0) < 0) | |
107 | return -1; | |
108 | else | |
109 | return 0; | |
110 | ||
111 | } | |
112 | ||
113 | static inline unsigned int get_rtc_ss(void) | |
114 | { | |
115 | struct rtc_time h; | |
116 | ||
117 | get_rtc_time(&h); | |
118 | return h.tm_sec; | |
119 | } | |
120 | ||
121 | static inline int get_rtc_pll(struct rtc_pll_info *pll) | |
122 | { | |
123 | return -EINVAL; | |
124 | } | |
125 | static inline int set_rtc_pll(struct rtc_pll_info *pll) | |
126 | { | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | #endif /* __KERNEL__ */ | |
131 | #endif /* __ASM_RTC_H__ */ |