rk8xx_rtc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2021 Emmanuel Vadot <manu@FreeBSD.org>
    5  * Copyright (c) 2021 Peter Jeremy <peterj@FreeBSD.org>
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/bus.h>
   34 #include <sys/systm.h>
   35 #include <sys/clock.h>
   36 
   37 #include <dev/iicbus/pmic/rockchip/rk8xx.h>
   38 
   39 int
   40 rk8xx_gettime(device_t dev, struct timespec *ts)
   41 {
   42         struct rk8xx_softc *sc;
   43         struct bcd_clocktime bct;
   44         uint8_t data[7];
   45         uint8_t ctrl;
   46         int error;
   47 
   48         sc = device_get_softc(dev);
   49 
   50         /* Latch the RTC value into the shadow registers and set 24hr mode */
   51         error = rk8xx_read(dev, sc->rtc_regs.ctrl, &ctrl, 1);
   52         if (error != 0)
   53                 return (error);
   54 
   55         ctrl |= sc->rtc_regs.ctrl_readsel_mask;
   56         ctrl &= ~(sc->rtc_regs.ctrl_ampm_mask | sc->rtc_regs.ctrl_gettime_mask);
   57         error = rk8xx_write(dev, sc->rtc_regs.ctrl, &ctrl, 1);
   58         if (error != 0)
   59                 return (error);
   60         ctrl |= sc->rtc_regs.ctrl_gettime_mask;
   61         error = rk8xx_write(dev, sc->rtc_regs.ctrl, &ctrl, 1);
   62         if (error != 0)
   63                 return (error);
   64         if (sc->type == RK809 || sc->type == RK817) {
   65                 /* wait one 32khz cycle for clock shadow registers to latch */
   66                 DELAY(1000000 / 32000);
   67         }
   68         ctrl &= ~sc->rtc_regs.ctrl_gettime_mask;
   69         error = rk8xx_write(dev, sc->rtc_regs.ctrl, &ctrl, 1);
   70         if (error != 0)
   71                 return (error);
   72 
   73         /* This works as long as sc->rtc_regs.secs = 0 */
   74         error = rk8xx_read(dev, sc->rtc_regs.secs, data, 7);
   75         if (error != 0)
   76                 return (error);
   77 
   78         /*
   79          * If the reported year is earlier than 2019, assume the clock is unset.
   80          * This is both later than the reset value for the RK805 and RK808 as
   81          * well as being prior to the current time.
   82          */
   83         if (data[sc->rtc_regs.years] < 0x19)
   84                 return (EINVAL);
   85 
   86         memset(&bct, 0, sizeof(bct));
   87         bct.year = data[sc->rtc_regs.years];
   88         bct.mon = data[sc->rtc_regs.months] & sc->rtc_regs.months_mask;
   89         bct.day = data[sc->rtc_regs.days] & sc->rtc_regs.days_mask;
   90         bct.hour = data[sc->rtc_regs.hours] & sc->rtc_regs.hours_mask;
   91         bct.min = data[sc->rtc_regs.minutes] & sc->rtc_regs.minutes_mask;
   92         bct.sec = data[sc->rtc_regs.secs] & sc->rtc_regs.secs_mask;
   93         bct.dow = data[sc->rtc_regs.weeks] & sc->rtc_regs.weeks_mask;
   94         /* The day of week is reported as 1-7 with 1 = Monday */
   95         if (bct.dow == 7)
   96                 bct.dow = 0;
   97         bct.ispm = 0;
   98         if (sc->type == RK809 || sc->type == RK817)
   99                 bct.year += 0x2000;     /* valid for 2000-2099 only */
  100 
  101         if (bootverbose)
  102                 device_printf(dev, "Read RTC: %02x-%02x-%02x %02x:%02x:%02x\n",
  103                     bct.year, bct.mon, bct.day, bct.hour, bct.min, bct.sec);
  104 
  105         return (clock_bcd_to_ts(&bct, ts, false));
  106 }
  107 
  108 int
  109 rk8xx_settime(device_t dev, struct timespec *ts)
  110 {
  111         struct rk8xx_softc *sc;
  112         struct bcd_clocktime bct;
  113         uint8_t data[7];
  114         int error;
  115         uint8_t ctrl;
  116 
  117         sc = device_get_softc(dev);
  118 
  119         clock_ts_to_bcd(ts, &bct, false);
  120 
  121         /* This works as long as RK805_RTC_SECS = 0 */
  122         if (sc->type == RK809 || sc->type == RK817) {
  123                 /* valid for 2000-2099 only */
  124                 if ((bct.year & 0xff00) != 0x2000) {
  125                         device_printf(dev, "year out of range\n");
  126                         return (EINVAL);
  127                 }
  128                 bct.year &= 0x00ff;
  129         }
  130         data[sc->rtc_regs.years] = bct.year;
  131         data[sc->rtc_regs.months] = bct.mon;
  132         data[sc->rtc_regs.days] = bct.day;
  133         data[sc->rtc_regs.hours] = bct.hour;
  134         data[sc->rtc_regs.minutes] = bct.min;
  135         data[sc->rtc_regs.secs] = bct.sec;
  136         data[sc->rtc_regs.weeks] = bct.dow;
  137         /* The day of week is reported as 1-7 with 1 = Monday */
  138         if (data[sc->rtc_regs.weeks] == 0)
  139                 data[sc->rtc_regs.weeks] = 7;
  140 
  141         error = rk8xx_read(dev, sc->rtc_regs.ctrl, &ctrl, 1);
  142         if (error != 0)
  143                 return (error);
  144 
  145         ctrl |= sc->rtc_regs.ctrl_stop_mask;
  146         ctrl &= ~sc->rtc_regs.ctrl_ampm_mask;
  147         error = rk8xx_write(dev, sc->rtc_regs.ctrl, &ctrl, 1);
  148         if (error != 0)
  149                 return (error);
  150 
  151         error = rk8xx_write(dev, sc->rtc_regs.secs, data, 7);
  152         ctrl &= ~sc->rtc_regs.ctrl_stop_mask;
  153         rk8xx_write(dev, sc->rtc_regs.ctrl, &ctrl, 1);
  154 
  155         return (error);
  156 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/iicbus/pmic/rockchip/rk8xx_rtc.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/iicbus/pmic/rockchip/rk8xx_rtc.c