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Annotation of sys/arch/alpha/alpha/mcclock.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: mcclock.c,v 1.5 2002/03/14 01:26:26 millert Exp $     */
        !             2: /*     $NetBSD: mcclock.c,v 1.4 1996/10/13 02:59:41 christos 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/device.h>
        !            35:
        !            36: #include <alpha/alpha/clockvar.h>
        !            37: #include <alpha/alpha/mcclockvar.h>
        !            38: #include <dev/ic/mc146818reg.h>
        !            39:
        !            40: struct cfdriver mcclock_cd = {
        !            41:        NULL, "mcclock", DV_DULL,
        !            42: };
        !            43:
        !            44: void   mcclock_init(struct device *);
        !            45: void   mcclock_get(struct device *, time_t, struct clocktime *);
        !            46: void   mcclock_set(struct device *, struct clocktime *);
        !            47:
        !            48: const struct clockfns mcclock_clockfns = {
        !            49:        mcclock_init, mcclock_get, mcclock_set,
        !            50: };
        !            51:
        !            52: #define        mc146818_write(dev, reg, datum)                                 \
        !            53:            (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
        !            54: #define        mc146818_read(dev, reg)                                         \
        !            55:            (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
        !            56:
        !            57: void
        !            58: mcclock_attach(sc, busfns)
        !            59:        struct mcclock_softc *sc;
        !            60:        const struct mcclock_busfns *busfns;
        !            61: {
        !            62:
        !            63:        printf(": mc146818 or compatible");
        !            64:
        !            65:        sc->sc_busfns = busfns;
        !            66:
        !            67:        /* Turn interrupts off, just in case. */
        !            68:        mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
        !            69:
        !            70:        clockattach(&sc->sc_dev, &mcclock_clockfns);
        !            71: }
        !            72:
        !            73: void
        !            74: mcclock_init(dev)
        !            75:        struct device *dev;
        !            76: {
        !            77:        struct mcclock_softc *sc = (struct mcclock_softc *)dev;
        !            78:
        !            79:        mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_RATE_1024_Hz);
        !            80:        mc146818_write(sc, MC_REGB,
        !            81:            MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
        !            82: }
        !            83:
        !            84: /*
        !            85:  * Get the time of day, based on the clock's value and/or the base value.
        !            86:  */
        !            87: void
        !            88: mcclock_get(dev, base, ct)
        !            89:        struct device *dev;
        !            90:        time_t base;
        !            91:        struct clocktime *ct;
        !            92: {
        !            93:        struct mcclock_softc *sc = (struct mcclock_softc *)dev;
        !            94:        mc_todregs regs;
        !            95:        int s;
        !            96:
        !            97:        s = splclock();
        !            98:        MC146818_GETTOD(sc, &regs)
        !            99:        splx(s);
        !           100:
        !           101:        ct->sec = regs[MC_SEC];
        !           102:        ct->min = regs[MC_MIN];
        !           103:        ct->hour = regs[MC_HOUR];
        !           104:        ct->dow = regs[MC_DOW];
        !           105:        ct->day = regs[MC_DOM];
        !           106:        ct->mon = regs[MC_MONTH];
        !           107:        ct->year = regs[MC_YEAR];
        !           108: }
        !           109:
        !           110: /*
        !           111:  * Reset the TODR based on the time value.
        !           112:  */
        !           113: void
        !           114: mcclock_set(dev, ct)
        !           115:        struct device *dev;
        !           116:        struct clocktime *ct;
        !           117: {
        !           118:        struct mcclock_softc *sc = (struct mcclock_softc *)dev;
        !           119:        mc_todregs regs;
        !           120:        int s;
        !           121:
        !           122:        s = splclock();
        !           123:        MC146818_GETTOD(sc, &regs);
        !           124:        splx(s);
        !           125:
        !           126:        regs[MC_SEC] = ct->sec;
        !           127:        regs[MC_MIN] = ct->min;
        !           128:        regs[MC_HOUR] = ct->hour;
        !           129:        regs[MC_DOW] = ct->dow;
        !           130:        regs[MC_DOM] = ct->day;
        !           131:        regs[MC_MONTH] = ct->mon;
        !           132:        regs[MC_YEAR] = ct->year;
        !           133:
        !           134:        s = splclock();
        !           135:        MC146818_PUTTOD(sc, &regs);
        !           136:        splx(s);
        !           137: }