The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/pcf2123_rtc.c

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    1 /*-
    2  * Copyright (c) 2010, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: stable/8/sys/mips/atheros/pcf2123_rtc.c 215938 2010-11-27 12:26:40Z jchandra $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/bus.h>
   33 #include <sys/lock.h>
   34 #include <sys/time.h>
   35 #include <sys/clock.h>
   36 #include <sys/resource.h>
   37 #include <sys/systm.h>
   38 #include <sys/rman.h>
   39 #include <sys/kernel.h>
   40 #include <sys/module.h>
   41 
   42 #include <mips/atheros/pcf2123reg.h>
   43 
   44 #include <dev/spibus/spi.h>
   45 #include "spibus_if.h"
   46 
   47 #include "clock_if.h"
   48 
   49 #define YEAR_BASE       1970
   50 #define PCF2123_DELAY   50
   51 
   52 struct pcf2123_rtc_softc {
   53         device_t dev;
   54 };
   55 
   56 static int pcf2123_rtc_probe(device_t dev);
   57 static int pcf2123_rtc_attach(device_t dev);
   58 
   59 static int pcf2123_rtc_gettime(device_t dev, struct timespec *ts);
   60 static int pcf2123_rtc_settime(device_t dev, struct timespec *ts);
   61 
   62 static int
   63 pcf2123_rtc_probe(device_t dev)
   64 {
   65 
   66         device_set_desc(dev, "PCF2123 SPI RTC");
   67         return (0);
   68 }
   69 
   70 static int
   71 pcf2123_rtc_attach(device_t dev)
   72 {
   73         struct pcf2123_rtc_softc *sc;
   74         struct spi_command cmd;
   75         unsigned char rxBuf[3];
   76         unsigned char txBuf[3];
   77         int err;
   78 
   79         sc = device_get_softc(dev);
   80         sc->dev = dev;
   81 
   82         clock_register(dev, 1000000);
   83 
   84         memset(&cmd, 0, sizeof(cmd));
   85         memset(rxBuf, 0, sizeof(rxBuf));
   86         memset(txBuf, 0, sizeof(txBuf));
   87 
   88         /* Make sure Ctrl1 and Ctrl2 are zeroes */
   89         txBuf[0] = PCF2123_WRITE(PCF2123_REG_CTRL1);
   90         cmd.rx_cmd = rxBuf;
   91         cmd.tx_cmd = txBuf;
   92         cmd.rx_cmd_sz = sizeof(rxBuf);
   93         cmd.tx_cmd_sz = sizeof(txBuf);
   94         err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
   95         DELAY(PCF2123_DELAY);
   96 
   97         return (0);
   98 }
   99 
  100 static int
  101 pcf2123_rtc_gettime(device_t dev, struct timespec *ts)
  102 {
  103         struct clocktime ct;
  104         struct spi_command cmd;
  105         unsigned char rxTimedate[8];
  106         unsigned char txTimedate[8];
  107         int err;
  108 
  109         memset(&cmd, 0, sizeof(cmd));
  110         memset(rxTimedate, 0, sizeof(rxTimedate));
  111         memset(txTimedate, 0, sizeof(txTimedate));
  112 
  113         /*
  114          * Counter is stopped when access to time registers is in progress
  115          * So there is no need to stop/start counter
  116          */
  117         /* Start reading from seconds */
  118         txTimedate[0] = PCF2123_READ(PCF2123_REG_SECONDS);
  119         cmd.rx_cmd = rxTimedate;
  120         cmd.tx_cmd = txTimedate;
  121         cmd.rx_cmd_sz = sizeof(rxTimedate);
  122         cmd.tx_cmd_sz = sizeof(txTimedate);
  123         err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
  124         DELAY(PCF2123_DELAY);
  125 
  126         ct.nsec = 0;
  127         ct.sec = FROMBCD(rxTimedate[1] & 0x7f);
  128         ct.min = FROMBCD(rxTimedate[2] & 0x7f);
  129         ct.hour = FROMBCD(rxTimedate[3] & 0x3f);
  130 
  131         ct.dow = FROMBCD(rxTimedate[5] & 0x3f);
  132 
  133         ct.day = FROMBCD(rxTimedate[4] & 0x3f);
  134         ct.mon = FROMBCD(rxTimedate[6] & 0x1f);
  135         ct.year = YEAR_BASE + FROMBCD(rxTimedate[7]);
  136 
  137         return (clock_ct_to_ts(&ct, ts));
  138 }
  139 
  140 static int
  141 pcf2123_rtc_settime(device_t dev, struct timespec *ts)
  142 {
  143         struct clocktime ct;
  144         struct pcf2123_rtc_softc *sc;
  145         struct spi_command cmd;
  146         unsigned char rxTimedate[8];
  147         unsigned char txTimedate[8];
  148         int err;
  149 
  150         sc = device_get_softc(dev);
  151 
  152         /* Resolution: 1 sec */
  153         if (ts->tv_nsec >= 500000000)
  154                 ts->tv_sec++;
  155         ts->tv_nsec = 0;
  156         clock_ts_to_ct(ts, &ct);
  157 
  158         memset(&cmd, 0, sizeof(cmd));
  159         memset(rxTimedate, 0, sizeof(rxTimedate));
  160         memset(txTimedate, 0, sizeof(txTimedate));
  161 
  162         /* Start reading from seconds */
  163         cmd.rx_cmd = rxTimedate;
  164         cmd.tx_cmd = txTimedate;
  165         cmd.rx_cmd_sz = sizeof(rxTimedate);
  166         cmd.tx_cmd_sz = sizeof(txTimedate);
  167 
  168         /*
  169          * Counter is stopped when access to time registers is in progress
  170          * So there is no need to stop/start counter
  171          */
  172         txTimedate[0] = PCF2123_WRITE(PCF2123_REG_SECONDS);
  173         txTimedate[1] = TOBCD(ct.sec);
  174         txTimedate[2] = TOBCD(ct.min);
  175         txTimedate[3] = TOBCD(ct.hour);
  176         txTimedate[4] = TOBCD(ct.day);
  177         txTimedate[5] = TOBCD(ct.dow);
  178         txTimedate[6] = TOBCD(ct.mon);
  179         txTimedate[7] = TOBCD(ct.year - YEAR_BASE);
  180 
  181         err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
  182         DELAY(PCF2123_DELAY);
  183 
  184         return (err);
  185 }
  186 
  187 static device_method_t pcf2123_rtc_methods[] = {
  188         DEVMETHOD(device_probe,         pcf2123_rtc_probe),
  189         DEVMETHOD(device_attach,        pcf2123_rtc_attach),
  190 
  191         DEVMETHOD(clock_gettime,        pcf2123_rtc_gettime),
  192         DEVMETHOD(clock_settime,        pcf2123_rtc_settime),
  193 
  194         { 0, 0 },
  195 };
  196 
  197 static driver_t pcf2123_rtc_driver = {
  198         "rtc",
  199         pcf2123_rtc_methods,
  200         sizeof(struct pcf2123_rtc_softc),
  201 };
  202 static devclass_t pcf2123_rtc_devclass;
  203 
  204 DRIVER_MODULE(pcf2123_rtc, spibus, pcf2123_rtc_driver, pcf2123_rtc_devclass, 0, 0);

Cache object: 6e61cd6b8e08a9ea7fdb3fec522be4e2


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