363 lines
8.9 KiB
C
363 lines
8.9 KiB
C
/* $NetBSD: rtc.c,v 1.4 2002/10/02 03:25:47 thorpej Exp $ */
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/*
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* Copyright (c) 2000 Ben Harris
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* Copyright (c) 1994-1996 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* rtc.c - Routines to read and write the RTC and CMOS RAM
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*/
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/*
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* This driver supports the following chip:
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* Philips PCF8583 Clock/calendar with 240 x 8-bit RAM
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*/
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#include <sys/param.h>
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__RCSID("$NetBSD: rtc.c,v 1.4 2002/10/02 03:25:47 thorpej Exp $");
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#include <sys/errno.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/malloc.h>
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#include <sys/device.h>
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#include <machine/machdep.h>
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#include <dev/clock_subr.h>
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#include <acorn26/ioc/iic.h>
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#include <acorn26/ioc/pcf8583reg.h>
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struct rtc_softc {
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struct device sc_dev;
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int sc_flags;
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#define RTC_BROKEN 1
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#define RTC_OPEN 2
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int sc_addr;
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struct todr_chip_handle sc_ct;
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};
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static int rtcmatch(struct device *parent, struct cfdata *cf, void *aux);
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static void rtcattach(struct device *parent, struct device *self, void *aux);
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static int rtc_gettime(todr_chip_handle_t, struct timeval *);
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static int rtc_settime(todr_chip_handle_t, struct timeval *);
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static int rtc_getcal(todr_chip_handle_t, int *);
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static int rtc_setcal(todr_chip_handle_t, int);
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#define RTC_ADDR_YEAR 0xc0
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#define RTC_ADDR_CENT 0xc1
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extern struct cfdriver rtc_cd;
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struct rtc_softc *the_rtc;
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/* device and attach structures */
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CFATTACH_DECL(rtc, sizeof(struct rtc_softc),
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rtcmatch, rtcattach, NULL, NULL);
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/*
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* rtcmatch()
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*
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* Validate the IIC address to make sure its an RTC we understand
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*/
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int
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rtcmatch(parent, cf, aux)
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struct device *parent;
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struct cfdata *cf;
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void *aux;
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{
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struct iicbus_attach_args *ib = aux;
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char buf[1];
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if ((ib->ib_addr & PCF8583_MASK) == PCF8583_ADDR &&
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iic_control(parent, ib->ib_addr | IIC_READ, buf, 1) == 0)
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return 1;
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return 0;
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}
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/*
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* rtcattach()
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*
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* Attach the rtc device
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*/
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void
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rtcattach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct rtc_softc *sc = (struct rtc_softc *)self;
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struct iicbus_attach_args *ib = aux;
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u_char buff[1];
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sc->sc_flags |= RTC_BROKEN;
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sc->sc_addr = ib->ib_addr;
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if ((ib->ib_addr & PCF8583_MASK) == PCF8583_ADDR) {
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printf(": PCF8583");
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/* Read RTC register 0 and report info found */
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buff[0] = PCF8583_REG_CSR;
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if (iic_control(self->dv_parent, sc->sc_addr | IIC_WRITE,
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buff, 1))
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goto out;
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if (iic_control(self->dv_parent, sc->sc_addr | IIC_READ,
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buff, 1))
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goto out;
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switch (buff[0] & PCF8583_CSR_FN_MASK) {
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case PCF8583_CSR_FN_32768HZ:
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printf(", 32.768 kHz clock");
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break;
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case PCF8583_CSR_FN_50HZ:
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printf(", 50 Hz clock");
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break;
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case PCF8583_CSR_FN_EVENT:
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printf(", event counter");
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break;
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case PCF8583_CSR_FN_TEST:
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printf(", test mode");
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break;
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}
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if (buff[0] & PCF8583_CSR_STOP)
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printf(", stopped");
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if (buff[0] & PCF8583_CSR_ALARMENABLE)
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printf(", alarm enabled");
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sc->sc_flags &= ~RTC_BROKEN;
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}
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/* Set up MI todr(9) stuff (not really used) */
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sc->sc_ct.cookie = sc;
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sc->sc_ct.todr_settime = rtc_settime;
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sc->sc_ct.todr_gettime = rtc_gettime;
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sc->sc_ct.todr_getcal = rtc_getcal;
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sc->sc_ct.todr_setcal = rtc_setcal;
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if (the_rtc == NULL)
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the_rtc = sc;
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out:
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printf("\n");
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}
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/* Read a byte from CMOS RAM */
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int
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cmos_read(int location)
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{
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u_char buff;
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struct rtc_softc *sc = the_rtc;
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KASSERT(sc != NULL);
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buff = location;
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if (iic_control(sc->sc_dev.dv_parent, sc->sc_addr | IIC_WRITE,
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&buff, 1))
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return(-1);
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if (iic_control(sc->sc_dev.dv_parent, sc->sc_addr | IIC_READ,
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&buff, 1))
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return(-1);
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return(buff);
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}
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/* Write a byte to CMOS RAM */
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int
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cmos_write(int location, int value)
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{
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u_char buff[2];
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struct rtc_softc *sc = the_rtc;
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KASSERT(sc != NULL);
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buff[0] = location;
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buff[1] = value;
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if (iic_control(sc->sc_dev.dv_parent, sc->sc_addr | IIC_WRITE,
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buff, 2))
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return(-1);
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return(0);
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}
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static int
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rtc_settime(todr_chip_handle_t handle, struct timeval *tv)
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{
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struct rtc_softc *sc = handle->cookie;
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u_char buff[8];
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struct clock_ymdhms ymdhms;
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clock_secs_to_ymdhms(tv->tv_sec, &ymdhms);
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buff[0] = PCF8583_REG_CENTI;
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buff[PCF8583_REG_CENTI] = TOBCD(tv->tv_usec / 10000);
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buff[PCF8583_REG_SEC] = TOBCD(ymdhms.dt_sec);
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buff[PCF8583_REG_MIN] = TOBCD(ymdhms.dt_min);
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buff[PCF8583_REG_HOUR] = TOBCD(ymdhms.dt_hour);
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buff[PCF8583_REG_YEARDATE] = TOBCD(ymdhms.dt_day) |
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((ymdhms.dt_year % 4) << PCF8583_YEAR_SHIFT);
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buff[PCF8583_REG_WKDYMON] = TOBCD(ymdhms.dt_mon) |
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((ymdhms.dt_wday % 4) << PCF8583_WKDY_SHIFT);
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if (iic_control(sc->sc_dev.dv_parent,
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sc->sc_addr | IIC_WRITE, buff, 7))
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return EIO;
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if (cmos_write(RTC_ADDR_YEAR, ymdhms.dt_year % 100))
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return EIO;
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if (cmos_write(RTC_ADDR_CENT, ymdhms.dt_year / 100))
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return EIO;
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return 0;
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}
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void
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inittodr(time_t base)
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{
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int check;
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todr_chip_handle_t chip;
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struct timeval todrtime;
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check = 0;
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if (the_rtc == NULL) {
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printf("inittodr: rtc0 not present");
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time.tv_sec = base;
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time.tv_usec = 0;
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check = 1;
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} else {
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chip = &the_rtc->sc_ct;
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if (todr_gettime(chip, &todrtime) != 0) {
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printf("inittodr: Error reading clock");
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time.tv_sec = base;
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time.tv_usec = 0;
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check = 1;
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} else {
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time = todrtime;
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if (time.tv_sec > base + 3 * SECDAY) {
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printf("inittodr: Clock has gained %ld days",
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(time.tv_sec - base) / SECDAY);
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check = 1;
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} else if (time.tv_sec + SECDAY < base) {
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printf("inittodr: Clock has lost %ld day(s)",
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(base - time.tv_sec) / SECDAY);
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check = 1;
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}
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}
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}
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if (check)
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printf(" - CHECK AND RESET THE DATE.\n");
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}
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static int
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rtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
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{
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u_char buff[8];
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int byte, centi;
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struct rtc_softc *sc = handle->cookie;
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struct clock_ymdhms ymdhms;
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buff[0] = 0;
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if (iic_control(sc->sc_dev.dv_parent, sc->sc_addr | IIC_WRITE,buff, 1))
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return EIO;
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if (iic_control(sc->sc_dev.dv_parent, sc->sc_addr | IIC_READ, buff, 8))
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return EIO;
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centi = FROMBCD(buff[PCF8583_REG_CENTI]);
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ymdhms.dt_sec = FROMBCD(buff[PCF8583_REG_SEC]);
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ymdhms.dt_min = FROMBCD(buff[PCF8583_REG_MIN]);
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ymdhms.dt_hour = FROMBCD(buff[PCF8583_REG_HOUR] & PCF8583_HOUR_MASK);
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/* If in 12 hour mode need to look at the AM/PM flag */
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if (buff[PCF8583_REG_HOUR] & PCF8583_HOUR_12H) {
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ymdhms.dt_hour %= 12; /* 12AM -> 0, 12PM -> 12 */
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if (buff[PCF8583_REG_HOUR] & PCF8583_HOUR_PM)
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ymdhms.dt_hour += 12;
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}
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ymdhms.dt_day = FROMBCD(buff[PCF8583_REG_YEARDATE] &
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PCF8583_DATE_MASK);
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ymdhms.dt_mon = FROMBCD(buff[PCF8583_REG_WKDYMON] &
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PCF8583_MON_MASK);
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byte = cmos_read(RTC_ADDR_YEAR);
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if (byte == -1)
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return EIO;
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ymdhms.dt_year = byte;
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byte = cmos_read(RTC_ADDR_CENT);
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if (byte == -1)
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return EIO;
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ymdhms.dt_year += 100 * byte;
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/* Try to notice if the year's rolled over. */
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if (buff[PCF8583_REG_CSR] & PCF8583_CSR_MASK)
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printf("%s: cannot check year in mask mode\n",
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sc->sc_dev.dv_xname);
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else
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while (ymdhms.dt_year % 4 !=
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(buff[PCF8583_REG_YEARDATE] &
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PCF8583_YEAR_MASK) >> PCF8583_YEAR_SHIFT)
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ymdhms.dt_year++;
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tv->tv_sec = clock_ymdhms_to_secs(&ymdhms);
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tv->tv_usec = centi * 10000;
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return 0;
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}
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static int
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rtc_getcal(todr_chip_handle_t handle, int *vp)
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{
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return EOPNOTSUPP;
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}
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static int
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rtc_setcal(todr_chip_handle_t handle, int v)
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{
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return EOPNOTSUPP;
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}
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/* End of rtc.c */
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