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clock_subr.h revision 1.33 
      1 /*	$NetBSD: clock_subr.h,v 1.33 2025/09/09 14:52:10 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _DEV_CLOCK_SUBR_H_
     33 #define _DEV_CLOCK_SUBR_H_
     34 
     35 #include <sys/clock.h>
     36 #include <sys/device_if.h>
     37 #include <sys/stdbool.h>
     38 
     39 /*
     40  * "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
     41  */
     42 struct clock_ymdhms {
     43 	uint64_t dt_year;
     44 	uint8_t dt_mon;
     45 	uint8_t dt_day;
     46 	uint8_t dt_wday;	/* Day of week */
     47 	uint8_t dt_hour;
     48 	uint8_t dt_min;
     49 	uint8_t dt_sec;
     50 };
     51 
     52 time_t	clock_ymdhms_to_secs(struct clock_ymdhms *);
     53 int	clock_secs_to_ymdhms(time_t, struct clock_ymdhms *);
     54 
     55 /*
     56  * BCD to binary and binary to BCD.
     57  */
     58 static __inline unsigned int
     59 bcdtobin(unsigned int bcd)
     60 {
     61         return ((bcd >> 4) & 0x0f) * 10 + (bcd & 0x0f);
     62 }
     63 
     64 static __inline unsigned int
     65 bintobcd(unsigned int bin)
     66 {
     67 	return (((bin / 10) << 4) & 0xf0) | (bin % 10);
     68 }
     69 
     70 /*
     71  * Interface to time-of-day clock devices.
     72  *
     73  * todr_gettime: convert time-of-day clock into a `struct timeval'
     74  * todr_settime: set time-of-day clock from a `struct timeval'
     75  *
     76  * (this is probably not so useful:)
     77  * todr_setwen: provide a machine-dependent TOD clock write-enable callback
     78  *		function which takes one boolean argument:
     79  *			1 to enable writes; 0 to disable writes.
     80  */
     81 struct timeval;
     82 struct todr_chip_handle {
     83 	device_t todr_dev;	/* Device backing the TOD clock */
     84 	void	*todr_devaux;	/* Auxillary data (maybe) needed by device */
     85 	time_t	todr_base_time;	/* Base time (e.g. rootfs time) */
     86 
     87 	int	(*todr_gettime)(struct todr_chip_handle *, struct timeval *);
     88 	int	(*todr_settime)(struct todr_chip_handle *, struct timeval *);
     89 	int	(*todr_gettime_ymdhms)(struct todr_chip_handle *,
     90 	    			struct clock_ymdhms *);
     91 	int	(*todr_settime_ymdhms)(struct todr_chip_handle *,
     92 	    			struct clock_ymdhms *);
     93 	int	(*todr_setwen)(struct todr_chip_handle *, int);
     94 
     95 };
     96 typedef struct todr_chip_handle *todr_chip_handle_t;
     97 
     98 void	todr_init(void);
     99 void	todr_attach(todr_chip_handle_t);
    100 void	todr_lock(void);
    101 void	todr_unlock(void);
    102 bool	todr_lock_owned(void);
    103 
    104 void	todr_set_systime(time_t base);
    105 void	todr_save_systime(void);
    106 
    107 #endif /* _DEV_CLOCK_SUBR_H_ */
    108