include/rtc.h

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * Generic RTC interface.
  10  */
  11 #ifndef _RTC_H_
  12 #define _RTC_H_
  13
  14 /* bcd<->bin functions are needed by almost all the RTC drivers, let's include
  15  * it there instead of in evey single driver */
  16
  17 #include <bcd.h>
  18
  19 /*
  20  * The struct used to pass data from the generic interface code to
  21  * the hardware dependend low-level code ande vice versa. Identical
  22  * to struct rtc_time used by the Linux kernel.
  23  *
  24  * Note that there are small but significant differences to the
  25  * common "struct time":
  26  *
  27  *              struct time:            struct rtc_time:
  28  * tm_mon       0 ... 11                1 ... 12
  29  * tm_year      years since 1900        years since 0
  30  */
  31
  32 struct rtc_time {
  33         int tm_sec;
  34         int tm_min;
  35         int tm_hour;
  36         int tm_mday;
  37         int tm_mon;
  38         int tm_year;
  39         int tm_wday;
  40         int tm_yday;
  41         int tm_isdst;
  42 };
  43
  44 int rtc_get (struct rtc_time *);
  45 int rtc_set (struct rtc_time *);
  46 void rtc_reset (void);
  47
  48 void GregorianDay (struct rtc_time *);
  49 void to_tm (int, struct rtc_time *);
  50 unsigned long mktime (unsigned int, unsigned int, unsigned int,
  51                       unsigned int, unsigned int, unsigned int);
  52
  53 /**
  54  * rtc_read8() - Read an 8-bit register
  55  *
  56  * @reg:        Register to read
  57  * @return value read
  58  */
  59 int rtc_read8(int reg);
  60
  61 /**
  62  * rtc_write8() - Write an 8-bit register
  63  *
  64  * @reg:        Register to write
  65  * @value:      Value to write
  66  */
  67 void rtc_write8(int reg, uchar val);
  68
  69 /**
  70  * rtc_read32() - Read a 32-bit value from the RTC
  71  *
  72  * @reg:        Offset to start reading from
  73  * @return value read
  74  */
  75 u32 rtc_read32(int reg);
  76
  77 /**
  78  * rtc_write32() - Write a 32-bit value to the RTC
  79  *
  80  * @reg:        Register to start writing to
  81  * @value:      Value to write
  82  */
  83 void rtc_write32(int reg, u32 value);
  84
  85 /**
  86  * rtc_init() - Set up the real time clock ready for use
  87  */
  88 void rtc_init(void);
  89
  90 #endif  /* _RTC_H_ */