Home | History | Annotate | Line # | Download | only in boot
clock.c revision 1.2 
      1 /*	$NetBSD: clock.c,v 1.2 2007/10/30 15:07:08 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Manuel Bouyer.
      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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 #include <sys/types.h>
     41 #include <lib/libsa/stand.h>
     42 #include <lib/libkern/libkern.h>
     43 
     44 #include <netinet/in.h>
     45 #include <netinet/in_systm.h>
     46 #include <lib/libsa/net.h>
     47 
     48 #include <dev/ic/mc146818reg.h>
     49 
     50 #include <mips/cpuregs.h>
     51 
     52 #include "boot.h"
     53 
     54 #define DELAY_CALIBRATE	1000
     55 
     56 #define MCCLOCK_BASE	0x10000070
     57 #define MCCLOCK_REG	0
     58 #define MCCLOCK_DATA	1
     59 
     60 void
     61 delay(int ms)
     62 {
     63 	/*
     64 	 * XXX need *real* clock calibration.
     65 	 */
     66 	volatile register int N = ms * DELAY_CALIBRATE;
     67 	for (; --N;)
     68 		__insn_barrier();
     69 }
     70 
     71 time_t
     72 getsecs(void)
     73 {
     74 	volatile uint8_t *mcclock_reg, *mcclock_data;
     75 	u_int sec;
     76 
     77 	mcclock_reg  = (void *)MIPS_PHYS_TO_KSEG1(MCCLOCK_BASE + MCCLOCK_REG);
     78 	mcclock_data = (void *)MIPS_PHYS_TO_KSEG1(MCCLOCK_BASE + MCCLOCK_DATA);
     79 
     80 	*mcclock_reg = MC_SEC;
     81 	sec  = bcdtobin(*mcclock_data);
     82 	*mcclock_reg = MC_MIN;
     83 	sec += bcdtobin(*mcclock_data) * 60;
     84 	*mcclock_reg = MC_HOUR;
     85 	sec += bcdtobin(*mcclock_data) * 60 * 60;
     86 
     87 	return (time_t)sec;
     88 }
     89