LXR linux/arch/parisc/include/asm/rtc.h

   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).  */
  39static 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
  47static 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
  99static 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
 113static 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
 121static inline int get_rtc_pll(struct rtc_pll_info *pll)
 122{
 123        return -EINVAL;
 124}
 125static 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