1 /*
2 * include/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
get_rtc_time(struct rtc_time * wtime)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 memset(wtime, 0, sizeof(*wtime));
54 if (pdc_tod_read(&tod_data) < 0)
55 return RTC_24H | RTC_BATT_BAD;
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
set_rtc_time(struct rtc_time * wtime)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
get_rtc_ss(void)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
get_rtc_pll(struct rtc_pll_info * pll)121 static inline int get_rtc_pll(struct rtc_pll_info *pll)
122 {
123 return -EINVAL;
124 }
set_rtc_pll(struct rtc_pll_info * pll)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__ */
132