Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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__ */ |