718cf2ccb9
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291 lines
7.4 KiB
C
291 lines
7.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003 Izumi Tsutsui. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: mc146818.c,v 1.16 2008/05/14 13:29:28 tsutsui Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* mc146818 and compatible time of day chip subroutines
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <dev/mc146818/mc146818reg.h>
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#include <dev/mc146818/mc146818var.h>
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#include "clock_if.h"
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static u_int mc146818_def_getcent(device_t);
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static void mc146818_def_setcent(device_t, u_int);
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int
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mc146818_attach(device_t dev)
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{
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struct mc146818_softc *sc;
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sc = device_get_softc(dev);
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if (mtx_initialized(&sc->sc_mtx) == 0) {
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device_printf(dev, "%s: mutex not initialized\n", __func__);
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return (ENXIO);
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}
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if (sc->sc_mcread == NULL)
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sc->sc_mcread = mc146818_def_read;
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if (sc->sc_mcwrite == NULL)
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sc->sc_mcwrite = mc146818_def_write;
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if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
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/*
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* Note that setting MC146818_NO_CENT_ADJUST means that
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* the century has to be stored in NVRAM somewhere.
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*/
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if (sc->sc_getcent == NULL)
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sc->sc_getcent = mc146818_def_getcent;
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if (sc->sc_setcent == NULL)
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sc->sc_setcent = mc146818_def_setcent;
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}
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mtx_lock_spin(&sc->sc_mtx);
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if (((*sc->sc_mcread)(dev, MC_REGD) & MC_REGD_VRT) == 0) {
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mtx_unlock_spin(&sc->sc_mtx);
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device_printf(dev, "%s: battery low\n", __func__);
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return (ENXIO);
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}
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sc->sc_rega = MC_BASE_32_KHz;
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(*sc->sc_mcwrite)(dev, MC_REGA, sc->sc_rega);
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sc->sc_regb = 0;
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sc->sc_regb |= (sc->sc_flag & MC146818_BCD) ? 0 : MC_REGB_BINARY;
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sc->sc_regb |= (sc->sc_flag & MC146818_12HR) ? 0 : MC_REGB_24HR;
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(*sc->sc_mcwrite)(dev, MC_REGB, sc->sc_regb);
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mtx_unlock_spin(&sc->sc_mtx);
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clock_register(dev, 1000000); /* 1 second resolution */
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return (0);
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}
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/*
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* Get time of day and convert it to a struct timespec.
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* Return 0 on success, an error number otherwise.
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*/
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int
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mc146818_gettime(device_t dev, struct timespec *ts)
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{
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struct mc146818_softc *sc;
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struct clocktime ct;
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int timeout, cent, year;
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sc = device_get_softc(dev);
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timeout = 1000000; /* XXX how long should we wait? */
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/*
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* If MC_REGA_UIP is 0 we have at least 244us before the next
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* update. If it's 1 an update is imminent.
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*/
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for (;;) {
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mtx_lock_spin(&sc->sc_mtx);
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if (((*sc->sc_mcread)(dev, MC_REGA) & MC_REGA_UIP) == 0)
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break;
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mtx_unlock_spin(&sc->sc_mtx);
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if (--timeout < 0) {
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device_printf(dev, "%s: timeout\n", __func__);
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return (EBUSY);
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}
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}
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#define FROMREG(x) ((sc->sc_flag & MC146818_BCD) ? FROMBCD(x) : (x))
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ct.nsec = 0;
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ct.sec = FROMREG((*sc->sc_mcread)(dev, MC_SEC));
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ct.min = FROMREG((*sc->sc_mcread)(dev, MC_MIN));
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ct.hour = FROMREG((*sc->sc_mcread)(dev, MC_HOUR));
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/* Map dow from 1 - 7 to 0 - 6. */
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ct.dow = FROMREG((*sc->sc_mcread)(dev, MC_DOW)) - 1;
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ct.day = FROMREG((*sc->sc_mcread)(dev, MC_DOM));
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ct.mon = FROMREG((*sc->sc_mcread)(dev, MC_MONTH));
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year = FROMREG((*sc->sc_mcread)(dev, MC_YEAR));
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year += sc->sc_year0;
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if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
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cent = (*sc->sc_getcent)(dev);
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year += cent * 100;
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} else if (year < POSIX_BASE_YEAR)
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year += 100;
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mtx_unlock_spin(&sc->sc_mtx);
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ct.year = year;
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return (clock_ct_to_ts(&ct, ts));
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}
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#ifdef notyet
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int
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mc146818_getsecs(device_t dev, int *secp)
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{
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struct mc146818_softc *sc;
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int sec, timeout;
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sc = device_get_softc(dev);
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timeout = 1000000; /* XXX how long should we wait? */
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for (;;) {
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mtx_lock_spin(&sc->sc_mtx);
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if (((*sc->sc_mcread)(dev, MC_REGA) & MC_REGA_UIP) == 0) {
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sec = FROMREG((*sc->sc_mcread)(dev, MC_SEC));
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mtx_unlock_spin(&sc->sc_mtx);
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break;
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}
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mtx_unlock_spin(&sc->sc_mtx);
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if (--timeout == 0) {
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device_printf(dev, "%s: timeout\n", __func__);
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return (EBUSY);
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}
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}
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#undef FROMREG
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*secp = sec;
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return (0);
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}
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#endif
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/*
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* Set the time of day clock based on the value of the struct timespec arg.
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* Return 0 on success, an error number otherwise.
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*/
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int
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mc146818_settime(device_t dev, struct timespec *ts)
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{
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struct mc146818_softc *sc;
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struct clocktime ct;
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int cent, year;
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sc = device_get_softc(dev);
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/* Accuracy is only one second. */
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if (ts->tv_nsec >= 500000000)
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ts->tv_sec++;
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ts->tv_nsec = 0;
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clock_ts_to_ct(ts, &ct);
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mtx_lock_spin(&sc->sc_mtx);
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/* Disable RTC updates and interrupts (if enabled). */
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(*sc->sc_mcwrite)(dev, MC_REGB,
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((sc->sc_regb & (MC_REGB_BINARY | MC_REGB_24HR)) | MC_REGB_SET));
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#define TOREG(x) ((sc->sc_flag & MC146818_BCD) ? TOBCD(x) : (x))
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(*sc->sc_mcwrite)(dev, MC_SEC, TOREG(ct.sec));
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(*sc->sc_mcwrite)(dev, MC_MIN, TOREG(ct.min));
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(*sc->sc_mcwrite)(dev, MC_HOUR, TOREG(ct.hour));
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/* Map dow from 0 - 6 to 1 - 7. */
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(*sc->sc_mcwrite)(dev, MC_DOW, TOREG(ct.dow + 1));
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(*sc->sc_mcwrite)(dev, MC_DOM, TOREG(ct.day));
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(*sc->sc_mcwrite)(dev, MC_MONTH, TOREG(ct.mon));
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year = ct.year - sc->sc_year0;
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if (sc->sc_flag & MC146818_NO_CENT_ADJUST) {
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cent = year / 100;
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(*sc->sc_setcent)(dev, cent);
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year -= cent * 100;
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} else if (year > 99)
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year -= 100;
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(*sc->sc_mcwrite)(dev, MC_YEAR, TOREG(year));
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/* Reenable RTC updates and interrupts. */
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(*sc->sc_mcwrite)(dev, MC_REGB, sc->sc_regb);
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mtx_unlock_spin(&sc->sc_mtx);
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#undef TOREG
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return (0);
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}
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#define MC_ADDR 0
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#define MC_DATA 1
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u_int
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mc146818_def_read(device_t dev, u_int reg)
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{
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struct mc146818_softc *sc;
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sc = device_get_softc(dev);
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_ADDR, reg);
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return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, MC_DATA));
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}
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void
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mc146818_def_write(device_t dev, u_int reg, u_int val)
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{
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struct mc146818_softc *sc;
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sc = device_get_softc(dev);
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_ADDR, reg);
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, MC_DATA, val);
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}
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#undef MC_ADDR
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#undef MC_DATA
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/*
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* Looks like it's common even across platforms to store the century at
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* 0x32 in the NVRAM of the mc146818.
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*/
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#define MC_CENT 0x32
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static u_int
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mc146818_def_getcent(device_t dev)
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{
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struct mc146818_softc *sc;
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sc = device_get_softc(dev);
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return ((*sc->sc_mcread)(dev, MC_CENT));
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}
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static void
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mc146818_def_setcent(device_t dev, u_int cent)
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{
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struct mc146818_softc *sc;
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sc = device_get_softc(dev);
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(*sc->sc_mcwrite)(dev, MC_CENT, cent);
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}
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#undef MC_CENT
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