mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
252 lines
6.1 KiB
C
252 lines
6.1 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 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_put() - 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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#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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void rtc_enable_32khz_output(void);
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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
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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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* @return 0 if OK, -EINVAL if the weekday could not be determined
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*/
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int rtc_to_tm(int 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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#endif /* _RTC_H_ */
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