ds1374u.c revision 216390
1169691Skan/*- 2132720Skan * Copyright (c) 2003-2009 RMI Corporation 3132720Skan * All rights reserved. 4132720Skan * 5132720Skan * Redistribution and use in source and binary forms, with or without 6132720Skan * modification, are permitted provided that the following conditions 7132720Skan * are met: 8132720Skan * 1. Redistributions of source code must retain the above copyright 9132720Skan * notice, this list of conditions and the following disclaimer. 10132720Skan * 2. Redistributions in binary form must reproduce the above copyright 11132720Skan * notice, this list of conditions and the following disclaimer in the 12132720Skan * documentation and/or other materials provided with the distribution. 13132720Skan * 3. Neither the name of RMI Corporation, nor the names of its contributors, 14132720Skan * may be used to endorse or promote products derived from this software 15132720Skan * without specific prior written permission. 16132720Skan * 17169691Skan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18132720Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19132720Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20132720Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21132720Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22132720Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23132720Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24132720Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25132720Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26132720Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27132720Skan * SUCH DAMAGE. 28132720Skan * 29132720Skan * RMI_BSD */ 30132720Skan 31169691Skan#include <sys/cdefs.h> 32169691Skan__FBSDID("$FreeBSD: head/sys/mips/rmi/dev/iic/ds1374u.c 216390 2010-12-12 06:00:26Z jchandra $"); 33132720Skan/* 34132720Skan * RTC chip sitting on the I2C bus. 35132720Skan */ 36132720Skan#include <sys/param.h> 37132720Skan#include <sys/systm.h> 38132720Skan#include <sys/kernel.h> 39132720Skan#include <sys/module.h> 40132720Skan#include <sys/bus.h> 41132720Skan#include <sys/clock.h> 42132720Skan#include <sys/time.h> 43132720Skan#include <sys/resource.h> 44132720Skan#include <sys/rman.h> 45132720Skan 46132720Skan#include <mips/include/bus.h> 47132720Skan#include <mips/include/cpu.h> 48132720Skan#include <mips/include/cpufunc.h> 49132720Skan#include <mips/include/frame.h> 50132720Skan#include <mips/include/resource.h> 51132720Skan 52132720Skan#include <dev/iicbus/iiconf.h> 53132720Skan#include <dev/iicbus/iicbus.h> 54132720Skan 55132720Skan#include "iicbus_if.h" 56132720Skan#include "clock_if.h" 57132720Skan 58132720Skan#define DS1374_RTC_COUNTER 0 /* counter (bytes 0-3) */ 59132720Skan 60132720Skanstruct ds1374u_softc { 61132720Skan uint32_t sc_addr; 62132720Skan device_t sc_dev; 63132720Skan}; 64132720Skan 65132720Skanstatic int 66132720Skands1374u_probe(device_t dev) 67132720Skan{ 68132720Skan device_set_desc(dev, "DS1374U-33 RTC"); 69132720Skan return (0); 70132720Skan} 71132720Skan 72132720Skanstatic int 73132720Skands1374u_attach(device_t dev) 74132720Skan{ 75132720Skan struct ds1374u_softc *sc = device_get_softc(dev); 76132720Skan 77132720Skan if(sc==NULL) { 78132720Skan printf("ds1374u_attach device_get_softc failed\n"); 79132720Skan return (0); 80132720Skan } 81132720Skan sc->sc_dev = dev; 82132720Skan sc->sc_addr = iicbus_get_addr(dev); 83132720Skan 84132720Skan clock_register(dev, 1000); 85132720Skan return (0); 86132720Skan} 87132720Skan 88132720Skan 89132720Skanstatic int 90132720Skands1374u_write(device_t dev, int reg, uint8_t val) 91132720Skan{ 92132720Skan uint8_t data[2]; 93169691Skan struct ds1374u_softc *sc = device_get_softc(dev); 94169691Skan struct iic_msg msgs[1] = { 95 { sc->sc_addr, IIC_M_WR, 2, data }, 96 }; 97 98 data[0] = reg; 99 data[1] = val; 100 if (iicbus_transfer(dev, msgs, 1) == 0) 101 return (0); 102 else 103 return (-1); 104} 105 106static int 107ds1374u_settime(device_t dev, struct timespec *ts) 108{ 109 int i; 110 int temp = 0; 111 112 for (i = 0; i < 4; i++) { 113 temp = (ts->tv_sec >> (8*i)) & 0xff; 114 if (ds1374u_write(dev, DS1374_RTC_COUNTER+i, temp)!=0) 115 return (-1); 116 } 117 return 0; 118} 119 120static int 121ds1374u_gettime(device_t dev, struct timespec *ts) 122{ 123 struct ds1374u_softc *sc = device_get_softc(dev); 124 uint8_t addr[1] = { DS1374_RTC_COUNTER }; 125 uint8_t secs[4]; 126 struct iic_msg msgs[2] = { 127 { sc->sc_addr, IIC_M_WR, 1, addr }, 128 { sc->sc_addr, IIC_M_RD, 4, secs }, 129 }; 130 int error; 131 132 error = iicbus_transfer(dev, msgs, 2); 133 if (error == 0) { 134 /* counter has seconds since epoch */ 135 ts->tv_sec = (secs[3] << 24) | (secs[2] << 16) 136 | (secs[1] << 8) | (secs[0] << 0); 137 ts->tv_nsec = 0; 138 } 139 return error; 140 return 0; 141} 142 143static device_method_t ds1374u_methods[] = { 144 DEVMETHOD(device_probe, ds1374u_probe), 145 DEVMETHOD(device_attach, ds1374u_attach), 146 147 DEVMETHOD(clock_gettime, ds1374u_gettime), 148 DEVMETHOD(clock_settime, ds1374u_settime), 149 150 {0, 0}, 151}; 152 153static driver_t ds1374u_driver = { 154 "ds1374u", 155 ds1374u_methods, 156 sizeof(struct ds1374u_softc), 157}; 158static devclass_t ds1374u_devclass; 159 160DRIVER_MODULE(ds1374u, iicbus, ds1374u_driver, ds1374u_devclass, 0, 0); 161MODULE_VERSION(ds1374u, 1); 162MODULE_DEPEND(ds1374u, iicbus, 1, 1, 1); 163