- Add driver for Dallas Semiconductor DS1339 RTC sitting
on I2C bus. Reviewed by: raj Approved by: imp MFC after: 2 week
This commit is contained in:
Stanislav Sedov
parent
fff6495ea6
commit
8e3b2aab49
232
sys/dev/iicbus/ds1339.c
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232
sys/dev/iicbus/ds1339.c
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/*-
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* Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org>,
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* Rafal Jaworowski <raj@FreeBSD.org>.
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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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*
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Dallas Semiconductor DS1339 RTC sitting on the I2C bus.
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/clock.h>
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#include <sys/time.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/frame.h>
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#include <machine/resource.h>
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#include <machine/intr.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include "iicbus_if.h"
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#include "clock_if.h"
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#define DS1339_ADDR 0xd0 /* slave address */
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#define DS1339_DATE_REG 0x0
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#define DS1339_CTRL_REG 0x0e
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#define DS1339_OSCD_FLAG 0x80
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#define DS1339_OSF_FLAG 0x80
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#define DS1339_24H_FLAG 0x40 /* 24 hours mode. */
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#define DS1339_PM_FLAG 0x20 /* AM/PM bit. */
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#define DS1339_CENT_FLAG 0x80 /* Century selector. */
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#define DS1339_CENT_SHIFT 7
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#define HALFSEC 500000000 /* 1/2 of second. */
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struct ds1339_softc {
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device_t sc_dev;
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};
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static int
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ds1339_probe(device_t dev)
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{
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struct ds1339_softc *sc;
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int addr;
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sc = device_get_softc(dev);
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iicbus_get_addr(dev, &addr);
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if (addr != DS1339_ADDR) {
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if (bootverbose)
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device_printf(dev, "fixed I2C slave address should "
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"be 0x%.2x instead of 0x%.2x.\n", DS1339_ADDR,
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addr);
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}
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device_set_desc(dev, "Dallas Semiconductor DS1339 RTC");
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return (0);
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}
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static int
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ds1339_attach(device_t dev)
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{
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struct ds1339_softc *sc = device_get_softc(dev);
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int error;
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sc->sc_dev = dev;
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uint8_t addr[1] = { DS1339_CTRL_REG };
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uint8_t rdata[2];
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uint8_t wrdata[3];
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struct iic_msg rmsgs[2] = {
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{ DS1339_ADDR, IIC_M_WR, 1, addr },
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{ DS1339_ADDR, IIC_M_RD, 2, rdata },
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};
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struct iic_msg wrmsgs[1] = {
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{ DS1339_ADDR, IIC_M_WR, 3, wrdata },
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};
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/* Read control and status registers. */
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error = iicbus_transfer(dev, rmsgs, 2);
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if (error != 0) {
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device_printf(dev, "could not read control registers.\n");
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return (ENXIO);
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}
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if ((rdata[0] & DS1339_OSCD_FLAG) != 0)
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rdata[0] &= ~DS1339_OSCD_FLAG; /* Enable oscillator
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* if disabled.
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*/
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if ((rdata[1] & DS1339_OSF_FLAG) != 0)
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rdata[1] &= ~DS1339_OSF_FLAG; /* Clear oscillator stop flag */
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/* Write modified registers back. */
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wrdata[0] = DS1339_CTRL_REG;
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wrdata[1] = rdata[0];
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wrdata[2] = rdata[1];
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goto out;
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error = iicbus_transfer(dev, wrmsgs, 1);
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if (error != 0) {
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device_printf(dev, "could not write control registers.\n");
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return (ENXIO);
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}
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out:
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clock_register(dev, 1000000);
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return (0);
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}
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static uint8_t
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ds1339_get_hours(uint8_t val)
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{
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uint8_t ret;
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if (!(val & DS1339_24H_FLAG))
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ret = FROMBCD(val & 0x3f);
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else if (!(val & DS1339_PM_FLAG))
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ret = FROMBCD(val & 0x1f);
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else
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ret = FROMBCD(val & 0x1f) + 12;
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return (ret);
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}
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static int
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ds1339_gettime(device_t dev, struct timespec *ts)
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{
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uint8_t addr[1] = { DS1339_DATE_REG };
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uint8_t date[7];
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struct iic_msg msgs[2] = {
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{ DS1339_ADDR, IIC_M_WR, 1, addr },
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{ DS1339_ADDR, IIC_M_RD, 7, date },
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};
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struct clocktime ct;
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int error;
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error = iicbus_transfer(dev, msgs, 2);
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if (error == 0) {
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ct.nsec = 0;
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ct.sec = FROMBCD(date[0] & 0x7f);
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ct.min = FROMBCD(date[1] & 0x7f);
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ct.hour = ds1339_get_hours(date[2]);
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ct.dow = FROMBCD(date[3] & 0x07) - 1;
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ct.day = FROMBCD(date[4] & 0x3f);
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ct.mon = FROMBCD(date[5] & 0x1f);
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ct.year = 1900 + FROMBCD(date[6]) +
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((date[5] & DS1339_CENT_FLAG) >> DS1339_CENT_SHIFT) * 100;
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error = clock_ct_to_ts(&ct, ts);
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}
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return error;
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}
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static int
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ds1339_settime(device_t dev, struct timespec *ts)
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{
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uint8_t data[8] = { DS1339_DATE_REG }; /* Register address. */
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struct iic_msg msgs[1] = {
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{ DS1339_ADDR, IIC_M_WR, 8, data },
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};
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struct clocktime ct;
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clock_ts_to_ct(ts, &ct);
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data[1] = TOBCD(ct.nsec >= HALFSEC ? ct.sec + 1 : ct.sec) & 0x7f;
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data[2] = TOBCD(ct.min) & 0x7f;
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data[3] = TOBCD(ct.hour) & 0x3f; /* We use 24-hours mode. */
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data[4] = TOBCD(ct.dow + 1) & 0x07;
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data[5] = TOBCD(ct.day) & 0x3f;
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data[6] = TOBCD(ct.mon) & 0x1f;
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if (ct.year >= 2000) {
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data[6] |= DS1339_CENT_FLAG;
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data[7] = TOBCD(ct.year - 2000);
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} else
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data[7] = TOBCD(ct.year - 1900);
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return iicbus_transfer(dev, msgs, 1);
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}
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static device_method_t ds1339_methods[] = {
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DEVMETHOD(device_probe, ds1339_probe),
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DEVMETHOD(device_attach, ds1339_attach),
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DEVMETHOD(clock_gettime, ds1339_gettime),
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DEVMETHOD(clock_settime, ds1339_settime),
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{0, 0},
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};
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static driver_t ds1339_driver = {
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"ds1339",
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ds1339_methods,
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sizeof(struct ds1339_softc),
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};
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static devclass_t ds1339_devclass;
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DRIVER_MODULE(ds1339, iicbus, ds1339_driver, ds1339_devclass, 0, 0);
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MODULE_VERSION(ds1339, 1);
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MODULE_DEPEND(ds1339, iicbus, 1, 1, 1);
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