include/asm-parisc/rtc.h

   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__ */