1 /* $NetBSD: clock_machdep.c,v 1.1 2002/02/22 19:43:58 uch Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 39 #include <dev/clock_subr.h> 40 #include <sh3/clock.h> 41 42 #ifdef DEBUG 43 #define STATIC 44 #else 45 #define STATIC static 46 #endif 47 48 #define DREAMCAST_RTC 0xa0710000 49 50 STATIC void dreamcast_rtc_init(void *); 51 STATIC void dreamcast_rtc_get(void *, time_t, struct clock_ymdhms *); 52 STATIC void dreamcast_rtc_set(void *, struct clock_ymdhms *); 53 54 STATIC u_int32_t dreamcast_read_rtc(void); 55 56 STATIC struct rtc_ops dreamcast_rtc_ops = { 57 .init = dreamcast_rtc_init, 58 .get = dreamcast_rtc_get, 59 .set = dreamcast_rtc_set 60 }; 61 62 void 63 machine_clock_init() 64 { 65 66 sh_clock_init(SH_CLOCK_NORTC, &dreamcast_rtc_ops); 67 } 68 69 void 70 dreamcast_rtc_init(void *cookie) 71 { 72 /* Nothing to do */ 73 } 74 75 void 76 dreamcast_rtc_get(void *cookie, time_t base, struct clock_ymdhms *dt) 77 { 78 79 clock_secs_to_ymdhms(dreamcast_read_rtc(), dt); 80 } 81 82 void 83 dreamcast_rtc_set(void *cookie, struct clock_ymdhms *dt) 84 { 85 86 /* Not suppoted */ 87 } 88 89 u_int32_t 90 dreamcast_read_rtc() 91 { 92 __volatile__ u_int32_t *rtc = (__volatile__ u_int32_t *)DREAMCAST_RTC; 93 u_int32_t new, old; 94 int i; 95 96 for (old = 0;;) { 97 for (i = 0; i < 3; i++) { 98 new = ((rtc[0] & 0xffff) << 16) | (rtc[1] & 0xffff); 99 if (new != old) 100 break; 101 } 102 if (i < 3) 103 old = new; 104 else 105 break; 106 } 107 108 /* offset 20 years */ 109 return (new - 631152000); 110 } 111