278 lines
6.6 KiB
C
278 lines
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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/*
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* Generic RTC interface.
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*/
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#ifndef _RTC_H_
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#define _RTC_H_
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/* bcd<->bin functions are needed by almost all the RTC drivers, let's include
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* it there instead of in evey single driver */
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#include <bcd.h>
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#include <rtc_def.h>
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#ifdef CONFIG_DM_RTC
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struct udevice;
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struct rtc_ops {
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/**
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* get() - get the current time
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*
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* Returns the current time read from the RTC device. The driver
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* is responsible for setting up every field in the structure.
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*
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* @dev: Device to read from
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* @time: Place to put the time that is read
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*/
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int (*get)(struct udevice *dev, struct rtc_time *time);
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/**
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* set() - set the current time
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*
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* Sets the time in the RTC device. The driver can expect every
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* field to be set correctly.
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*
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* @dev: Device to read from
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* @time: Time to write
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*/
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int (*set)(struct udevice *dev, const struct rtc_time *time);
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/**
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* reset() - reset the RTC to a known-good state
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*
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* This function resets the RTC to a known-good state. The time may
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* be unset by this method, so should be set after this method is
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* called.
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*
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* @dev: Device to read from
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* @return 0 if OK, -ve on error
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*/
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int (*reset)(struct udevice *dev);
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/**
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* read8() - Read an 8-bit register
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*
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* @dev: Device to read from
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* @reg: Register to read
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* @return value read, or -ve on error
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*/
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int (*read8)(struct udevice *dev, unsigned int reg);
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/**
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* write8() - Write an 8-bit register
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*
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* @dev: Device to write to
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* @reg: Register to write
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* @value: Value to write
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* @return 0 if OK, -ve on error
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*/
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int (*write8)(struct udevice *dev, unsigned int reg, int val);
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};
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/* Access the operations for an RTC device */
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#define rtc_get_ops(dev) ((struct rtc_ops *)(dev)->driver->ops)
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/**
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* dm_rtc_get() - Read the time from an RTC
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*
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* @dev: Device to read from
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* @time: Place to put the current time
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* @return 0 if OK, -ve on error
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*/
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int dm_rtc_get(struct udevice *dev, struct rtc_time *time);
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/**
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* dm_rtc_set() - Write a time to an RTC
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*
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* @dev: Device to read from
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* @time: Time to write into the RTC
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* @return 0 if OK, -ve on error
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*/
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int dm_rtc_set(struct udevice *dev, struct rtc_time *time);
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/**
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* dm_rtc_reset() - reset the RTC to a known-good state
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*
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* If the RTC appears to be broken (e.g. it is not counting up in seconds)
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* it may need to be reset to a known good state. This function achieves this.
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* After resetting the RTC the time should then be set to a known value by
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* the caller.
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*
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* @dev: Device to read from
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* @return 0 if OK, -ve on error
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*/
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int dm_rtc_reset(struct udevice *dev);
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/**
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* rtc_read8() - Read an 8-bit register
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*
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* @dev: Device to read from
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* @reg: Register to read
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* @return value read, or -ve on error
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*/
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int rtc_read8(struct udevice *dev, unsigned int reg);
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/**
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* rtc_write8() - Write an 8-bit register
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*
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* @dev: Device to write to
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* @reg: Register to write
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* @value: Value to write
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* @return 0 if OK, -ve on error
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*/
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int rtc_write8(struct udevice *dev, unsigned int reg, int val);
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/**
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* rtc_read16() - Read a 16-bit value from the RTC
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*
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* @dev: Device to read from
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* @reg: Offset to start reading from
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* @valuep: Place to put the value that is read
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* @return 0 if OK, -ve on error
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*/
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int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep);
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/**
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* rtc_write16() - Write a 16-bit value to the RTC
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*
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* @dev: Device to write to
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* @reg: Register to start writing to
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* @value: Value to write
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* @return 0 if OK, -ve on error
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*/
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int rtc_write16(struct udevice *dev, unsigned int reg, u16 value);
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/**
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* rtc_read32() - Read a 32-bit value from the RTC
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*
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* @dev: Device to read from
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* @reg: Offset to start reading from
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* @valuep: Place to put the value that is read
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* @return 0 if OK, -ve on error
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*/
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int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep);
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/**
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* rtc_write32() - Write a 32-bit value to the RTC
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*
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* @dev: Device to write to
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* @reg: Register to start writing to
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* @value: Value to write
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* @return 0 if OK, -ve on error
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*/
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int rtc_write32(struct udevice *dev, unsigned int reg, u32 value);
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#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
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int rtc_enable_32khz_output(int busnum, int chip_addr);
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#endif
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#else
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int rtc_get (struct rtc_time *);
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int rtc_set (struct rtc_time *);
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void rtc_reset (void);
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#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
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void rtc_enable_32khz_output(void);
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#endif
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/**
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* rtc_read8() - Read an 8-bit register
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*
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* @reg: Register to read
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* @return value read
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*/
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int rtc_read8(int reg);
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/**
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* rtc_write8() - Write an 8-bit register
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*
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* @reg: Register to write
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* @value: Value to write
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*/
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void rtc_write8(int reg, uchar val);
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/**
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* rtc_read32() - Read a 32-bit value from the RTC
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*
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* @reg: Offset to start reading from
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* @return value read
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*/
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u32 rtc_read32(int reg);
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/**
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* rtc_write32() - Write a 32-bit value to the RTC
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*
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* @reg: Register to start writing to
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* @value: Value to write
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*/
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void rtc_write32(int reg, u32 value);
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/**
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* rtc_init() - Set up the real time clock ready for use
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*/
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void rtc_init(void);
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#endif /* CONFIG_DM_RTC */
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/**
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* is_leap_year - Check if year is a leap year
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*
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* @year Year
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* @return 1 if leap year
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*/
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static inline bool is_leap_year(unsigned int year)
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{
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return (!(year % 4) && (year % 100)) || !(year % 400);
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}
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/**
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* rtc_calc_weekday() - Work out the weekday from a time
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*
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* This only works for the Gregorian calendar - i.e. after 1752 (in the UK).
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* It sets time->tm_wdaay to the correct day of the week.
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*
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* @time: Time to inspect. tm_wday is updated
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* @return 0 if OK, -EINVAL if the weekday could not be determined
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*/
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int rtc_calc_weekday(struct rtc_time *time);
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/**
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* rtc_to_tm() - Convert a time_t value into a broken-out time
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*
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* The following fields are set up by this function:
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* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday
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*
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* Note that tm_yday and tm_isdst are set to 0.
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*
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* @time_t: Number of seconds since 1970-01-01 00:00:00
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* @time: Place to put the broken-out time
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*/
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void rtc_to_tm(u64 time_t, struct rtc_time *time);
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/**
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* rtc_mktime() - Convert a broken-out time into a time_t value
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*
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* The following fields need to be valid for this function to work:
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* tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year
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*
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* Note that tm_wday and tm_yday are ignored.
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*
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* @time: Broken-out time to convert
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* @return corresponding time_t value, seconds since 1970-01-01 00:00:00
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*/
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unsigned long rtc_mktime(const struct rtc_time *time);
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/**
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* rtc_month_days() - The number of days in the month
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*
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* @month: month (January = 0)
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* @year: year (4 digits)
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*/
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int rtc_month_days(unsigned int month, unsigned int year);
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#endif /* _RTC_H_ */
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