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/* include/asm-parisc/rtc.h */

#ifndef _ASM_RTC_H

#define _ASM_RTC_H

#ifdef __KERNEL__

#include <linux/rtc.h>

#include <asm/errno.h>

#define RTC_PIE 0x40            /* periodic interrupt enable */

#define RTC_AIE 0x20            /* alarm interrupt enable */

#define RTC_UIE 0x10            /* update-finished interrupt enable */

#define RTC_BATT_BAD 0x100      /* battery bad */

/* some dummy definitions */

#define RTC_SQWE 0x08           /* enable square-wave output */

#define RTC_DM_BINARY 0x04      /* all time/date values are BCD if clear */

#define RTC_24H 0x02            /* 24 hour mode - else hours bit 7 means pm */

#define RTC_DST_EN 0x01         /* auto switch DST - works f. USA only */

/* constants for calculation */

#define SECS_PER_HOUR   (60 * 60)

#define SECS_PER_DAY    (SECS_PER_HOUR * 24)

#define __isleap(year) \

  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

/* How many days come before each month (0-12).  */

static const unsigned short int __mon_yday[2][13] =

{

        /* Normal years.  */

        { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },

        /* Leap years.  */

        { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }

};

static inline unsigned int get_rtc_time(struct rtc_time *wtime)

{

        /*

         * Only the values that we read from the RTC are set. We leave

         * tm_wday, tm_yday and tm_isdst untouched. Even though the

         * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated

         * by the RTC when initially set to a non-zero value.

         */

        struct pdc_tod tod_data;

        long int days, rem, y;

        const unsigned short int *ip;

        if (pdc_tod_read(&tod_data) < 0)

                return (RTC_24H | RTC_BATT_BAD);

        // most of the remainder of this function is:

        //      Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc.

        //      This was originally a part of the GNU C Library.

        //      It is distributed under the GPL, and was swiped from offtime.c

        days = tod_data.tod_sec / SECS_PER_DAY;

        rem = tod_data.tod_sec % SECS_PER_DAY;

        wtime->tm_hour = rem / SECS_PER_HOUR;

        rem %= SECS_PER_HOUR;

        wtime->tm_min = rem / 60;

        wtime->tm_sec = rem % 60;

        y = 1970;

#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))

#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))

        while (days < 0 || days >= (__isleap (y) ? 366 : 365))

        {

                /* Guess a corrected year, assuming 365 days per year.  */

                long int yg = y + days / 365 - (days % 365 < 0);

                /* Adjust DAYS and Y to match the guessed year.  */

                days -= ((yg - y) * 365

                         + LEAPS_THRU_END_OF (yg - 1)

                         - LEAPS_THRU_END_OF (y - 1));

                y = yg;

        }

        wtime->tm_year = y - 1900;

#undef DIV

#undef LEAPS_THRU_END_OF

        ip = __mon_yday[__isleap(y)];

        for (y = 11; days < (long int) ip[y]; --y)

                continue;

        days -= ip[y];

        wtime->tm_mon = y;

        wtime->tm_mday = days + 1;

        return (RTC_24H);

}

static inline int set_rtc_time(struct rtc_time *wtime)

{

        u_int32_t secs;

        secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday,

                      wtime->tm_hour, wtime->tm_min, wtime->tm_sec);

        if (pdc_tod_set(secs, 0) < 0)

                return -EINVAL;

        else

                return 0;

}

static inline unsigned int get_rtc_ss(void)

{

        return -EINVAL;

}

static inline int get_rtc_pll(struct rtc_pll_info *pll)

{

        return -EINVAL;

}

static inline int set_rtc_pll(struct rtc_pll_info *pll)

{

        return -EINVAL;

}

#endif /* __KERNEL__ */

#endif /* _ASM__RTC_H */