1 /* $NetBSD: clock_subr.h,v 1.25 2014/11/20 16:26:34 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1996 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
37 /*
38 * "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
39 */
40 struct clock_ymdhms {
41 uint64_t dt_year;
42 uint8_t dt_mon;
43 uint8_t dt_day;
44 uint8_t dt_wday; /* Day of week */
45 uint8_t dt_hour;
46 uint8_t dt_min;
47 uint8_t dt_sec;
48 };
49
50 time_t clock_ymdhms_to_secs(struct clock_ymdhms *);
51 int clock_secs_to_ymdhms(time_t, struct clock_ymdhms *);
52
53 /*
54 * BCD to binary and binary to BCD.
55 */
56 static inline unsigned int
bcdtobin(unsigned int bcd)57 bcdtobin(unsigned int bcd)
58 {
59 return ((bcd >> 4) & 0x0f) * 10 + (bcd & 0x0f);
60 }
61
62 static inline unsigned int
bintobcd(unsigned int bin)63 bintobcd(unsigned int bin)
64 {
65 return (((bin / 10) << 4) & 0xf0) | (bin % 10);
66 }
67
68 /*
69 * Interface to time-of-day clock devices.
70 *
71 * todr_gettime: convert time-of-day clock into a `struct timeval'
72 * todr_settime: set time-of-day clock from a `struct timeval'
73 *
74 * (this is probably not so useful:)
75 * todr_setwen: provide a machine-dependent TOD clock write-enable callback
76 * function which takes one boolean argument:
77 * 1 to enable writes; 0 to disable writes.
78 */
79 struct timeval;
80 struct todr_chip_handle {
81 void *cookie; /* Device specific data */
82 void *bus_cookie; /* Bus specific data */
83 time_t base_time; /* Base time (e.g. rootfs time) */
84
85 int (*todr_gettime)(struct todr_chip_handle *, struct timeval *);
86 int (*todr_settime)(struct todr_chip_handle *, struct timeval *);
87 int (*todr_gettime_ymdhms)(struct todr_chip_handle *,
88 struct clock_ymdhms *);
89 int (*todr_settime_ymdhms)(struct todr_chip_handle *,
90 struct clock_ymdhms *);
91 int (*todr_setwen)(struct todr_chip_handle *, int);
92
93 };
94 typedef struct todr_chip_handle *todr_chip_handle_t;
95
96 #define todr_wenable(ct, v) if ((ct)->todr_setwen) \
97 ((*(ct)->todr_setwen)(ct, v))
98
99 /*
100 * Probably these should evolve into internal routines in kern_todr.c.
101 */
102 extern int todr_gettime(todr_chip_handle_t, struct timeval *);
103 extern int todr_settime(todr_chip_handle_t, struct timeval *);
104
105 /*
106 * Machine-dependent function that machine-independent RTC drivers can
107 * use to register their todr_chip_handle_t with inittodr()/resettodr().
108 */
109 void todr_attach(todr_chip_handle_t);
110
111 #endif /* _DEV_CLOCK_SUBR_H_ */
112