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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2001
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* Generic RTC interface.
*/
#ifndef _RTC_H_
#define _RTC_H_
/* bcd<->bin functions are needed by almost all the RTC drivers, let's include
* it there instead of in evey single driver */
#include <bcd.h>
#include <rtc_def.h>
#ifdef CONFIG_DM_RTC
struct rtc_ops {
/**
* get() - get the current time
*
* Returns the current time read from the RTC device. The driver
* is responsible for setting up every field in the structure.
*
* @dev: Device to read from
* @time: Place to put the time that is read
*/
int (*get)(struct udevice *dev, struct rtc_time *time);
/**
* set() - set the current time
*
* Sets the time in the RTC device. The driver can expect every
* field to be set correctly.
*
* @dev: Device to read from
* @time: Time to write
*/
int (*set)(struct udevice *dev, const struct rtc_time *time);
/**
* reset() - reset the RTC to a known-good state
*
* This function resets the RTC to a known-good state. The time may
* be unset by this method, so should be set after this method is
* called.
*
* @dev: Device to read from
* @return 0 if OK, -ve on error
*/
int (*reset)(struct udevice *dev);
/**
* read8() - Read an 8-bit register
*
* @dev: Device to read from
* @reg: Register to read
* @return value read, or -ve on error
*/
int (*read8)(struct udevice *dev, unsigned int reg);
/**
* write8() - Write an 8-bit register
*
* @dev: Device to write to
* @reg: Register to write
* @value: Value to write
* @return 0 if OK, -ve on error
*/
int (*write8)(struct udevice *dev, unsigned int reg, int val);
};
/* Access the operations for an RTC device */
#define rtc_get_ops(dev) ((struct rtc_ops *)(dev)->driver->ops)
/**
* dm_rtc_get() - Read the time from an RTC
*
* @dev: Device to read from
* @time: Place to put the current time
* @return 0 if OK, -ve on error
*/
int dm_rtc_get(struct udevice *dev, struct rtc_time *time);
/**
* dm_rtc_set() - Write a time to an RTC
*
* @dev: Device to read from
* @time: Time to write into the RTC
* @return 0 if OK, -ve on error
*/
int dm_rtc_set(struct udevice *dev, struct rtc_time *time);
/**
* dm_rtc_reset() - reset the RTC to a known-good state
*
* If the RTC appears to be broken (e.g. it is not counting up in seconds)
* it may need to be reset to a known good state. This function achieves this.
* After resetting the RTC the time should then be set to a known value by
* the caller.
*
* @dev: Device to read from
* @return 0 if OK, -ve on error
*/
int dm_rtc_reset(struct udevice *dev);
/**
* rtc_read8() - Read an 8-bit register
*
* @dev: Device to read from
* @reg: Register to read
* @return value read, or -ve on error
*/
int rtc_read8(struct udevice *dev, unsigned int reg);
/**
* rtc_write8() - Write an 8-bit register
*
* @dev: Device to write to
* @reg: Register to write
* @value: Value to write
* @return 0 if OK, -ve on error
*/
int rtc_write8(struct udevice *dev, unsigned int reg, int val);
/**
* rtc_read16() - Read a 16-bit value from the RTC
*
* @dev: Device to read from
* @reg: Offset to start reading from
* @valuep: Place to put the value that is read
* @return 0 if OK, -ve on error
*/
int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep);
/**
* rtc_write16() - Write a 16-bit value to the RTC
*
* @dev: Device to write to
* @reg: Register to start writing to
* @value: Value to write
* @return 0 if OK, -ve on error
*/
int rtc_write16(struct udevice *dev, unsigned int reg, u16 value);
/**
* rtc_read32() - Read a 32-bit value from the RTC
*
* @dev: Device to read from
* @reg: Offset to start reading from
* @valuep: Place to put the value that is read
* @return 0 if OK, -ve on error
*/
int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep);
/**
* rtc_write32() - Write a 32-bit value to the RTC
*
* @dev: Device to write to
* @reg: Register to start writing to
* @value: Value to write
* @return 0 if OK, -ve on error
*/
int rtc_write32(struct udevice *dev, unsigned int reg, u32 value);
#else
int rtc_get (struct rtc_time *);
int rtc_set (struct rtc_time *);
void rtc_reset (void);
void rtc_enable_32khz_output(void);
/**
* rtc_read8() - Read an 8-bit register
*
* @reg: Register to read
* @return value read
*/
int rtc_read8(int reg);
/**
* rtc_write8() - Write an 8-bit register
*
* @reg: Register to write
* @value: Value to write
*/
void rtc_write8(int reg, uchar val);
/**
* rtc_read32() - Read a 32-bit value from the RTC
*
* @reg: Offset to start reading from
* @return value read
*/
u32 rtc_read32(int reg);
/**
* rtc_write32() - Write a 32-bit value to the RTC
*
* @reg: Register to start writing to
* @value: Value to write
*/
void rtc_write32(int reg, u32 value);
/**
* rtc_init() - Set up the real time clock ready for use
*/
void rtc_init(void);
#endif /* CONFIG_DM_RTC */
/**
* is_leap_year - Check if year is a leap year
*
* @year Year
* @return 1 if leap year
*/
static inline bool is_leap_year(unsigned int year)
{
return (!(year % 4) && (year % 100)) || !(year % 400);
}
/**
* rtc_calc_weekday() - Work out the weekday from a time
*
* This only works for the Gregorian calendar - i.e. after 1752 (in the UK).
* It sets time->tm_wdaay to the correct day of the week.
*
* @time: Time to inspect. tm_wday is updated
* @return 0 if OK, -EINVAL if the weekday could not be determined
*/
int rtc_calc_weekday(struct rtc_time *time);
/**
* rtc_to_tm() - Convert a time_t value into a broken-out time
*
* The following fields are set up by this function:
* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday
*
* Note that tm_yday and tm_isdst are set to 0.
*
* @time_t: Number of seconds since 1970-01-01 00:00:00
* @time: Place to put the broken-out time
*/
void rtc_to_tm(u64 time_t, struct rtc_time *time);
/**
* rtc_mktime() - Convert a broken-out time into a time_t value
*
* The following fields need to be valid for this function to work:
* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year
*
* Note that tm_wday and tm_yday are ignored.
*
* @time: Broken-out time to convert
* @return corresponding time_t value, seconds since 1970-01-01 00:00:00
*/
unsigned long rtc_mktime(const struct rtc_time *time);
#endif /* _RTC_H_ */
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