234 lines
6.7 KiB
C
234 lines
6.7 KiB
C
/* $NetBSD: rtc.c,v 1.14 2006/09/04 23:45:30 gdamore Exp $ */
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/*
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* Copyright (c) 2001 Valeriy E. Ushakov
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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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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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/*
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* `rtc' is a DS1287A (== MC146818A) time-of-day clock at EBus.
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* In Krups it's not used to store idprom so this driver doesn't
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* support it. Don't know about other ms-IIep systems.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.14 2006/09/04 23:45:30 gdamore Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#ifdef GPROF
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#include <sys/gmon.h>
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#endif
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#include <machine/bus.h>
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#include <machine/autoconf.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/mc146818reg.h>
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#include <dev/ebus/ebusreg.h>
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#include <dev/ebus/ebusvar.h>
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struct rtc_ebus_softc {
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struct device sc_dev;
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bus_space_tag_t sc_bt; /* parent bus tag */
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bus_space_handle_t sc_bh; /* handle for registers */
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};
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static int rtcmatch_ebus(struct device *, struct cfdata *, void *);
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static void rtcattach_ebus(struct device *, struct device *, void *);
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CFATTACH_DECL(rtc_ebus, sizeof(struct rtc_ebus_softc),
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rtcmatch_ebus, rtcattach_ebus, NULL, NULL);
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/* XXX: global TOD clock handle (sparc/clock.c) */
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extern todr_chip_handle_t todr_handle;
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/* todr(9) methods */
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static int rtc_gettime(todr_chip_handle_t, volatile struct timeval *);
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static int rtc_settime(todr_chip_handle_t, volatile struct timeval *);
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int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */
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/*
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* MD read/write functions declared in mc146818reg.h
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*/
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#define RTC_ADDR 0
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#define RTC_DATA 1
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u_int
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mc146818_read(void *cookie, u_int reg)
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{
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struct rtc_ebus_softc *sc = cookie;
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bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
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return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA));
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}
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void
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mc146818_write(void *cookie, u_int reg, u_int datum)
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{
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struct rtc_ebus_softc *sc = cookie;
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bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg);
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bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum);
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}
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static int
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rtcmatch_ebus(struct device *parent, struct cfdata *cf, void *aux)
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{
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struct ebus_attach_args *ea = aux;
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return (strcmp(cf->cf_name, ea->ea_name) == 0);
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}
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static void
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rtcattach_ebus(struct device *parent, struct device *self, void *aux)
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{
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struct rtc_ebus_softc *sc = (void *)self;
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struct ebus_attach_args *ea = aux;
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todr_chip_handle_t handle;
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sc->sc_bt = ea->ea_bustag;
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if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
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ea->ea_reg[0].size, 0, &sc->sc_bh) != 0)
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{
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printf(": unable to map registers\n");
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return;
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}
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/* XXX: no "model" property in Krups */
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printf(": time-of-day clock\n");
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/*
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* Turn interrupts off (clear MC_REGB_?IE bits), just in case
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* (although they shouldn't be wired to an interrupt
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* controller on sparcs).
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*/
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mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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/* setup our todr_handle */
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handle = malloc(ALIGN(sizeof(struct todr_chip_handle)),
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M_DEVBUF, M_NOWAIT);
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handle->cookie = sc;
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handle->bus_cookie = NULL; /* unused */
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handle->todr_gettime = rtc_gettime;
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handle->todr_settime = rtc_settime;
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handle->todr_setwen = NULL; /* not necessary, no idprom to protect */
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todr_attach(handle);
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}
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/*
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* Get time-of-day and convert to a `struct timeval'
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* Return 0 on success; an error number otherwise.
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*/
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static int
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rtc_gettime(todr_chip_handle_t handle, volatile struct timeval *tv)
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{
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struct rtc_ebus_softc *sc = handle->cookie;
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struct clock_ymdhms dt;
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u_int year;
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/* update in progress; spin loop */
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while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP)
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continue;
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/* stop updates (XXX: do we need that???) */
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mc146818_write(sc, MC_REGB,
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(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
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/* read time */
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dt.dt_sec = mc146818_read(sc, MC_SEC);
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dt.dt_min = mc146818_read(sc, MC_MIN);
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dt.dt_hour = mc146818_read(sc, MC_HOUR);
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dt.dt_day = mc146818_read(sc, MC_DOM);
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dt.dt_mon = mc146818_read(sc, MC_MONTH);
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year = mc146818_read(sc, MC_YEAR);
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/* reenable updates */
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mc146818_write(sc, MC_REGB,
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(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
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/* year in the century 0..99: adjust to AD */
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year += 1900;
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if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0)
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year += 100;
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dt.dt_year = year;
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/* simple sanity checks */
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if (dt.dt_mon > 12 || dt.dt_day > 31
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|| dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60)
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return (ERANGE);
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tv->tv_sec = clock_ymdhms_to_secs(&dt);
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tv->tv_usec = 0;
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return (0);
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}
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/*
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* Set the time-of-day clock based on the value of the `struct timeval' arg.
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* Return 0 on success; an error number otherwise.
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*/
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static int
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rtc_settime(todr_chip_handle_t handle, volatile struct timeval *tv)
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{
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struct rtc_ebus_softc *sc = handle->cookie;
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struct clock_ymdhms dt;
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u_int year;
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clock_secs_to_ymdhms(tv->tv_sec, &dt);
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year = dt.dt_year - 1900;
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if (year >= 100 && rtc_auto_century_adjust != 0)
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year -= 100;
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/* stop updates */
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mc146818_write(sc, MC_REGB,
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(mc146818_read(sc, MC_REGB) | MC_REGB_SET));
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mc146818_write(sc, MC_SEC, dt.dt_sec);
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mc146818_write(sc, MC_MIN, dt.dt_min);
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mc146818_write(sc, MC_HOUR, dt.dt_hour);
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mc146818_write(sc, MC_DOW, dt.dt_wday + 1);
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mc146818_write(sc, MC_DOM, dt.dt_day);
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mc146818_write(sc, MC_MONTH, dt.dt_mon);
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mc146818_write(sc, MC_YEAR, year);
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/* reenable updates */
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mc146818_write(sc, MC_REGB,
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(mc146818_read(sc, MC_REGB) & ~MC_REGB_SET));
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return (0);
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}
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