The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/dec/mcclock.c

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    1 /* $FreeBSD: stable/3/sys/dev/dec/mcclock.c 50583 1999-08-29 16:33:42Z peter $ */
    2 /* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
    3 
    4 /*
    5  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
    6  * All rights reserved.
    7  *
    8  * Author: Chris G. Demetriou
    9  *
   10  * Permission to use, copy, modify and distribute this software and
   11  * its documentation is hereby granted, provided that both the copyright
   12  * notice and this permission notice appear in all copies of the
   13  * software, derivative works or modified versions, and any portions
   14  * thereof, and that both notices appear in supporting documentation.
   15  *
   16  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   17  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   18  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   19  *
   20  * Carnegie Mellon requests users of this software to return to
   21  *
   22  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   23  *  School of Computer Science
   24  *  Carnegie Mellon University
   25  *  Pittsburgh PA 15213-3890
   26  *
   27  * any improvements or extensions that they make and grant Carnegie the
   28  * rights to redistribute these changes.
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 
   36 #include <machine/clockvar.h>
   37 #include <dev/dec/mcclockvar.h>
   38 #include <dev/dec/mc146818reg.h>
   39 
   40 /*
   41  * XXX rate is machine-dependent.
   42  */
   43 #ifdef __alpha__
   44 #define MC_DEFAULTRATE MC_RATE_1024_Hz
   45 #endif
   46 #ifdef __pmax__
   47 #define MC_DEFAULTRATE MC_RATE_256_Hz
   48 #endif
   49 
   50 void
   51 mcclock_attach(device_t dev)
   52 {
   53         /* Turn interrupts off, just in case. */
   54         MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
   55 
   56         clockattach(dev);
   57 }
   58 
   59 void
   60 mcclock_init(device_t dev)
   61 {
   62         MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
   63         MCCLOCK_WRITE(dev, MC_REGB,
   64             MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
   65 }
   66 
   67 /*
   68  * Get the time of day, based on the clock's value and/or the base value.
   69  */
   70 void
   71 mcclock_get(device_t dev, time_t base, struct clocktime *ct)
   72 {
   73         mc_todregs regs;
   74         int s;
   75 
   76         s = splclock();
   77         MC146818_GETTOD(dev, &regs)
   78         splx(s);
   79 
   80         ct->sec = regs[MC_SEC];
   81         ct->min = regs[MC_MIN];
   82         ct->hour = regs[MC_HOUR];
   83         ct->dow = regs[MC_DOW];
   84         ct->day = regs[MC_DOM];
   85         ct->mon = regs[MC_MONTH];
   86         ct->year = regs[MC_YEAR];
   87 }
   88 
   89 /*
   90  * Reset the TODR based on the time value.
   91  */
   92 void
   93 mcclock_set(device_t dev, struct clocktime *ct)
   94 {
   95         mc_todregs regs;
   96         int s;
   97 
   98         s = splclock();
   99         MC146818_GETTOD(dev, &regs);
  100         splx(s);
  101 
  102         regs[MC_SEC] = ct->sec;
  103         regs[MC_MIN] = ct->min;
  104         regs[MC_HOUR] = ct->hour;
  105         regs[MC_DOW] = ct->dow;
  106         regs[MC_DOM] = ct->day;
  107         regs[MC_MONTH] = ct->mon;
  108         regs[MC_YEAR] = ct->year;
  109 
  110         s = splclock();
  111         MC146818_PUTTOD(dev, &regs);
  112         splx(s);
  113 }
  114 
  115 int
  116 mcclock_getsecs(device_t dev, int *secp)
  117 {
  118         int timeout = 100000000;
  119         int sec;
  120         int s;
  121 
  122         s = splclock();
  123         for (;;) {
  124                 if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
  125                         sec = MCCLOCK_READ(dev, MC_SEC);
  126                         break;
  127                 }
  128                 if (--timeout == 0)
  129                         goto fail;
  130         }
  131 
  132         splx(s);
  133         *secp = sec;
  134         return 0;
  135 
  136  fail:
  137         splx(s);
  138         return ETIMEDOUT;
  139 }

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