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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /* $NetBSD: mcclock.c,v 1.17 2005/12/11 12:21:20 christos Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
    5  * All rights reserved.
    6  *
    7  * Author: Chris G. Demetriou
    8  *
    9  * Permission to use, copy, modify and distribute this software and
   10  * its documentation is hereby granted, provided that both the copyright
   11  * notice and this permission notice appear in all copies of the
   12  * software, derivative works or modified versions, and any portions
   13  * thereof, and that both notices appear in supporting documentation.
   14  *
   15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   18  *
   19  * Carnegie Mellon requests users of this software to return to
   20  *
   21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   22  *  School of Computer Science
   23  *  Carnegie Mellon University
   24  *  Pittsburgh PA 15213-3890
   25  *
   26  * any improvements or extensions that they make and grant Carnegie the
   27  * rights to redistribute these changes.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.17 2005/12/11 12:21:20 christos Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/systm.h>
   36 #include <sys/device.h>
   37 
   38 #include <dev/dec/clockvar.h>
   39 #include <dev/dec/mcclockvar.h>
   40 #include <dev/ic/mc146818reg.h>
   41 
   42 /*
   43  * XXX default rate is machine-dependent.
   44  */
   45 #ifdef __alpha__
   46 #define MC_DFEAULTHZ    1024
   47 #endif
   48 #ifdef pmax
   49 #define MC_DEFAULTHZ    256
   50 #endif
   51 
   52 
   53 void    mcclock_init(struct device *);
   54 void    mcclock_get(struct device *, time_t, struct clocktime *);
   55 void    mcclock_set(struct device *, struct clocktime *);
   56 
   57 const struct clockfns mcclock_clockfns = {
   58         mcclock_init, mcclock_get, mcclock_set,
   59 };
   60 
   61 #define mc146818_write(dev, reg, datum)                                 \
   62             (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
   63 #define mc146818_read(dev, reg)                                         \
   64             (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
   65 
   66 void
   67 mcclock_attach(sc, busfns)
   68         struct mcclock_softc *sc;
   69         const struct mcclock_busfns *busfns;
   70 {
   71 
   72         printf(": mc146818 or compatible");
   73 
   74         sc->sc_busfns = busfns;
   75 
   76         /* Turn interrupts off, just in case. */
   77         mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
   78 
   79         clockattach(&sc->sc_dev, &mcclock_clockfns);
   80 }
   81 
   82 void
   83 mcclock_init(dev)
   84         struct device *dev;
   85 {
   86         struct mcclock_softc *sc = (struct mcclock_softc *)dev;
   87         int rate;
   88 
   89 again:
   90         switch (hz) {
   91         case 32:
   92                 rate = MC_BASE_32_KHz | MC_RATE_32_Hz;
   93                 break;
   94         case 64:
   95                 rate = MC_BASE_32_KHz | MC_RATE_64_Hz;
   96                 break;
   97         case 128:
   98                 rate = MC_BASE_32_KHz | MC_RATE_128_Hz;
   99                 break;
  100         case 256:
  101                 rate = MC_BASE_32_KHz | MC_RATE_256_Hz;
  102                 break;
  103         case 512:
  104                 rate = MC_BASE_32_KHz | MC_RATE_512_Hz;
  105                 break;
  106         case 1024:
  107                 rate = MC_BASE_32_KHz | MC_RATE_1024_Hz;
  108                 break;
  109         case 2048:
  110                 rate = MC_BASE_32_KHz | MC_RATE_2048_Hz;
  111                 break;
  112         case 4096:
  113                 rate = MC_BASE_32_KHz | MC_RATE_4096_Hz;
  114                 break;
  115         case 8192:
  116                 rate = MC_BASE_32_KHz | MC_RATE_8192_Hz;
  117                 break;
  118         case 16384:
  119                 rate = MC_BASE_4_MHz | MC_RATE_1;
  120                 break;
  121         case 32768:
  122                 rate = MC_BASE_4_MHz | MC_RATE_2;
  123                 break;
  124         default:
  125                 printf("%s: Cannot get %d Hz clock; using %d Hz\n",
  126                     sc->sc_dev.dv_xname, hz, MC_DEFAULTHZ);
  127                 hz = MC_DEFAULTHZ;
  128                 goto again;
  129         }
  130         mc146818_write(sc, MC_REGA, rate);
  131         mc146818_write(sc, MC_REGB,
  132             MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
  133 }
  134 
  135 /*
  136  * Get the time of day, based on the clock's value and/or the base value.
  137  */
  138 void
  139 mcclock_get(dev, base, ct)
  140         struct device *dev;
  141         time_t base;
  142         struct clocktime *ct;
  143 {
  144         struct mcclock_softc *sc = (struct mcclock_softc *)dev;
  145         mc_todregs regs;
  146         int s;
  147 
  148         s = splclock();
  149         MC146818_GETTOD(sc, &regs)
  150         splx(s);
  151 
  152         ct->sec = regs[MC_SEC];
  153         ct->min = regs[MC_MIN];
  154         ct->hour = regs[MC_HOUR];
  155         ct->dow = regs[MC_DOW];
  156         ct->day = regs[MC_DOM];
  157         ct->mon = regs[MC_MONTH];
  158         ct->year = regs[MC_YEAR];
  159 }
  160 
  161 /*
  162  * Reset the TODR based on the time value.
  163  */
  164 void
  165 mcclock_set(dev, ct)
  166         struct device *dev;
  167         struct clocktime *ct;
  168 {
  169         struct mcclock_softc *sc = (struct mcclock_softc *)dev;
  170         mc_todregs regs;
  171         int s;
  172 
  173         s = splclock();
  174         MC146818_GETTOD(sc, &regs);
  175         splx(s);
  176 
  177         regs[MC_SEC] = ct->sec;
  178         regs[MC_MIN] = ct->min;
  179         regs[MC_HOUR] = ct->hour;
  180         regs[MC_DOW] = ct->dow;
  181         regs[MC_DOM] = ct->day;
  182         regs[MC_MONTH] = ct->mon;
  183         regs[MC_YEAR] = ct->year;
  184 
  185         s = splclock();
  186         MC146818_PUTTOD(sc, &regs);
  187         splx(s);
  188 }

Cache object: 36710a015f792c4070a767ff7c74e593


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.