The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/mk48txx.c

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    1 /*      $NetBSD: mk48txx.c,v 1.28 2020/01/01 19:24:03 thorpej Exp $ */
    2 /*-
    3  * Copyright (c) 2000 The NetBSD Foundation, Inc.
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to The NetBSD Foundation
    7  * by Paul Kranenburg.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /*
   32  * Mostek MK48T02, MK48T08, MK48T59 time-of-day chip subroutines.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __KERNEL_RCSID(0, "$NetBSD: mk48txx.c,v 1.28 2020/01/01 19:24:03 thorpej Exp $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/device.h>
   41 #include <sys/errno.h>
   42 
   43 #include <sys/bus.h>
   44 #include <dev/clock_subr.h>
   45 #include <dev/ic/mk48txxreg.h>
   46 #include <dev/ic/mk48txxvar.h>
   47 
   48 int mk48txx_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
   49 int mk48txx_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
   50 uint8_t mk48txx_def_nvrd(struct mk48txx_softc *, int);
   51 void mk48txx_def_nvwr(struct mk48txx_softc *, int, uint8_t);
   52 
   53 const struct {
   54         const char *name;
   55         bus_size_t nvramsz;
   56         bus_size_t clkoff;
   57         int flags;
   58 #define MK48TXX_EXT_REGISTERS   1       /* Has extended register set */
   59 } mk48txx_models[] = {
   60         { "mk48t02", MK48T02_CLKSZ, MK48T02_CLKOFF, 0 },
   61         { "mk48t08", MK48T08_CLKSZ, MK48T08_CLKOFF, 0 },
   62         { "mk48t18", MK48T18_CLKSZ, MK48T18_CLKOFF, 0 },
   63         { "mk48t59", MK48T59_CLKSZ, MK48T59_CLKOFF, MK48TXX_EXT_REGISTERS },
   64         { "ds1553", DS1553_CLKSZ, DS1553_CLKOFF, MK48TXX_EXT_REGISTERS },
   65 };
   66 
   67 void
   68 mk48txx_attach(struct mk48txx_softc *sc)
   69 {
   70         todr_chip_handle_t handle;
   71         int i;
   72 
   73         aprint_normal(": %s", sc->sc_model);
   74 
   75         i = __arraycount(mk48txx_models);
   76         while (--i >= 0) {
   77                 if (strcmp(sc->sc_model, mk48txx_models[i].name) == 0)
   78                         break;
   79         }
   80         if (i < 0)
   81                 panic("%s: unsupported model", __func__);
   82 
   83         sc->sc_nvramsz = mk48txx_models[i].nvramsz;
   84         sc->sc_clkoffset = mk48txx_models[i].clkoff;
   85 
   86         handle = &sc->sc_handle;
   87         handle->cookie = sc;
   88         handle->todr_gettime = NULL;
   89         handle->todr_settime = NULL;
   90         handle->todr_gettime_ymdhms = mk48txx_gettime_ymdhms;
   91         handle->todr_settime_ymdhms = mk48txx_settime_ymdhms;
   92 
   93         if (sc->sc_nvrd == NULL)
   94                 sc->sc_nvrd = mk48txx_def_nvrd;
   95         if (sc->sc_nvwr == NULL)
   96                 sc->sc_nvwr = mk48txx_def_nvwr;
   97 
   98         todr_attach(handle);
   99 }
  100 
  101 /*
  102  * Get time-of-day and convert to a `struct timeval'
  103  * Return 0 on success; an error number otherwise.
  104  */
  105 int
  106 mk48txx_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
  107 {
  108         struct mk48txx_softc *sc;
  109         bus_size_t clkoff;
  110         int year;
  111         uint8_t csr;
  112 
  113         sc = handle->cookie;
  114         clkoff = sc->sc_clkoffset;
  115 
  116         /* enable read (stop time) */
  117         csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
  118         csr |= MK48TXX_CSR_READ;
  119         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
  120 
  121         dt->dt_sec = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_ISEC));
  122         dt->dt_min = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IMIN));
  123         dt->dt_hour = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IHOUR));
  124         dt->dt_day = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IDAY));
  125         dt->dt_wday = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IWDAY));
  126         dt->dt_mon = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IMON));
  127         year = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IYEAR));
  128 
  129         if (sc->sc_flag & MK48TXX_HAVE_CENT_REG) {
  130                 year += 100*bcdtobin(csr & MK48TXX_CSR_CENT_MASK);
  131         } else {
  132                 year += sc->sc_year0;
  133                 if (year < POSIX_BASE_YEAR &&
  134                     (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) == 0)
  135                         year += 100;
  136         }
  137 
  138         dt->dt_year = year;
  139 
  140         /* time wears on */
  141         csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
  142         csr &= ~MK48TXX_CSR_READ;
  143         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
  144 
  145         return 0;
  146 }
  147 
  148 /*
  149  * Set the time-of-day clock based on the value of the `struct timeval' arg.
  150  * Return 0 on success; an error number otherwise.
  151  */
  152 int
  153 mk48txx_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
  154 {
  155         struct mk48txx_softc *sc;
  156         bus_size_t clkoff;
  157         uint8_t csr;
  158         int year;
  159         int cent;
  160 
  161         sc = handle->cookie;
  162         clkoff = sc->sc_clkoffset;
  163 
  164         if ((sc->sc_flag & MK48TXX_HAVE_CENT_REG) == 0) {
  165                 cent = 0;
  166                 year = dt->dt_year - sc->sc_year0;
  167                 if (year > 99 &&
  168                     (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) == 0)
  169                         year -= 100;
  170         } else {
  171                 cent = dt->dt_year / 100;
  172                 year = dt->dt_year % 100;
  173         }
  174 
  175         /* enable write */
  176         csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
  177         csr |= MK48TXX_CSR_WRITE;
  178         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
  179 
  180         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ISEC, bintobcd(dt->dt_sec));
  181         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IMIN, bintobcd(dt->dt_min));
  182         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IHOUR, bintobcd(dt->dt_hour));
  183         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IWDAY, bintobcd(dt->dt_wday));
  184         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IDAY, bintobcd(dt->dt_day));
  185         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IMON, bintobcd(dt->dt_mon));
  186         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IYEAR, bintobcd(year));
  187 
  188         /*
  189          * If we have a century register and the century has changed
  190          * update it.
  191          */
  192         if ((sc->sc_flag & MK48TXX_HAVE_CENT_REG)
  193             && (csr & MK48TXX_CSR_CENT_MASK) != bintobcd(cent)) {
  194                 csr &= ~MK48TXX_CSR_CENT_MASK;
  195                 csr |= MK48TXX_CSR_CENT_MASK & bintobcd(cent);
  196                 (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
  197         }
  198 
  199         /* load them up */
  200         csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
  201         csr &= ~MK48TXX_CSR_WRITE;
  202         (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
  203 
  204         return 0;
  205 }
  206 
  207 int
  208 mk48txx_get_nvram_size(todr_chip_handle_t handle, bus_size_t *vp)
  209 {
  210         struct mk48txx_softc *sc;
  211 
  212         sc = handle->cookie;
  213         *vp = sc->sc_nvramsz;
  214         return 0;
  215 }
  216 
  217 uint8_t
  218 mk48txx_def_nvrd(struct mk48txx_softc *sc, int off)
  219 {
  220 
  221         return bus_space_read_1(sc->sc_bst, sc->sc_bsh, off);
  222 }
  223 
  224 void
  225 mk48txx_def_nvwr(struct mk48txx_softc *sc, int off, uint8_t v)
  226 {
  227 
  228         bus_space_write_1(sc->sc_bst, sc->sc_bsh, off, v);
  229 }

Cache object: 8484032ef2bdfc1d3980090166496648


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