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/sparc64/sparc64/rtc.c

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    1 /*-
    2  * Copyright (c) 2004 Marius Strobl <marius@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, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 /*
   31  * The `rtc' device is found on the ISA bus and the EBus.  The ISA version
   32  * always is a MC146818 compatible clock while the EBus variant either is the
   33  * MC146818 compatible Real-Time Clock function of a National Semiconductor
   34  * PC87317/PC97317 which also provides Advanced Power Control functionality
   35  * or a Texas Instruments bq4802.
   36  */
   37 
   38 #include "opt_isa.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/bus.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/module.h>
   46 #include <sys/mutex.h>
   47 #include <sys/resource.h>
   48 
   49 #include <dev/ofw/ofw_bus.h>
   50 
   51 #include <machine/bus.h>
   52 #include <machine/resource.h>
   53 
   54 #include <sys/rman.h>
   55 
   56 #include <isa/isavar.h>
   57 
   58 #include <dev/mc146818/mc146818reg.h>
   59 #include <dev/mc146818/mc146818var.h>
   60 
   61 #include "clock_if.h"
   62 
   63 #define RTC_DESC        "Real-Time Clock"
   64 
   65 #define RTC_READ        mc146818_def_read
   66 #define RTC_WRITE       mc146818_def_write
   67 
   68 #define PC87317_COMMON          MC_REGA_DV0     /* bank 0 */
   69 #define PC87317_RTC             (MC_REGA_DV1 | MC_REGA_DV0) /* bank 1 */
   70 #define PC87317_RTC_CR          0x48            /* Century Register */
   71 #define PC87317_APC             MC_REGA_DV2     /* bank 2 */
   72 #define PC87317_APC_CADDR       0x51            /* Century Address Register */
   73 #define PC87317_APC_CADDR_BANK0 0x00            /* locate CR in bank 0 */
   74 #define PC87317_APC_CADDR_BANK1 0x80            /* locate CR in bank 1 */
   75 
   76 static devclass_t rtc_devclass;
   77 
   78 static device_attach_t rtc_attach;
   79 static device_probe_t rtc_ebus_probe;
   80 #ifdef DEV_ISA
   81 static device_probe_t rtc_isa_probe;
   82 #endif
   83 
   84 static device_method_t rtc_ebus_methods[] = {
   85         /* Device interface */
   86         DEVMETHOD(device_probe,         rtc_ebus_probe),
   87         DEVMETHOD(device_attach,        rtc_attach),
   88 
   89         /* clock interface */
   90         DEVMETHOD(clock_gettime,        mc146818_gettime),
   91         DEVMETHOD(clock_settime,        mc146818_settime),
   92 
   93         DEVMETHOD_END
   94 };
   95 
   96 static driver_t rtc_ebus_driver = {
   97         "rtc",
   98         rtc_ebus_methods,
   99         sizeof(struct mc146818_softc),
  100 };
  101 
  102 DRIVER_MODULE(rtc, ebus, rtc_ebus_driver, rtc_devclass, 0, 0);
  103 
  104 #ifdef DEV_ISA
  105 static device_method_t rtc_isa_methods[] = {
  106         /* Device interface */
  107         DEVMETHOD(device_probe,         rtc_isa_probe),
  108         DEVMETHOD(device_attach,        rtc_attach),
  109 
  110         /* clock interface */
  111         DEVMETHOD(clock_gettime,        mc146818_gettime),
  112         DEVMETHOD(clock_settime,        mc146818_settime),
  113 
  114         DEVMETHOD_END
  115 };
  116 
  117 static driver_t rtc_isa_driver = {
  118         "rtc",
  119         rtc_isa_methods,
  120         sizeof(struct mc146818_softc),
  121 };
  122 
  123 DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
  124 #endif
  125 
  126 static u_int pc87317_getcent(device_t dev);
  127 static void pc87317_setcent(device_t dev, u_int cent);
  128 
  129 static int
  130 rtc_ebus_probe(device_t dev)
  131 {
  132 
  133         if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
  134                 /* The bq4802 is not supported, yet. */
  135                 if (ofw_bus_get_compat(dev) != NULL &&
  136                     strcmp(ofw_bus_get_compat(dev), "bq4802") == 0)
  137                         return (ENXIO);
  138                 device_set_desc(dev, RTC_DESC);
  139                 return (0);
  140         }
  141 
  142         return (ENXIO);
  143 }
  144 
  145 #ifdef DEV_ISA
  146 static struct isa_pnp_id rtc_isa_ids[] = {
  147         { 0x000bd041, RTC_DESC }, /* PNP0B00 */
  148         { 0 }
  149 };
  150 
  151 static int
  152 rtc_isa_probe(device_t dev)
  153 {
  154 
  155         if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0)
  156                 return (0);
  157 
  158         return (ENXIO);
  159 }
  160 #endif
  161 
  162 static int
  163 rtc_attach(device_t dev)
  164 {
  165         struct timespec ts;
  166         struct mc146818_softc *sc;
  167         struct resource *res;
  168         int ebus, error, rid;
  169 
  170         sc = device_get_softc(dev);
  171 
  172         mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
  173 
  174         ebus = 0;
  175         if (strcmp(device_get_name(device_get_parent(dev)), "ebus") == 0)
  176                 ebus = 1;
  177 
  178         rid = 0;
  179         res = bus_alloc_resource_any(dev, ebus ? SYS_RES_MEMORY :
  180             SYS_RES_IOPORT, &rid, RF_ACTIVE);
  181         if (res == NULL) {
  182                 device_printf(dev, "cannot allocate resources\n");
  183                 error = ENXIO;
  184                 goto fail_mtx;
  185         }
  186         sc->sc_bst = rman_get_bustag(res);
  187         sc->sc_bsh = rman_get_bushandle(res);
  188 
  189         sc->sc_mcread = RTC_READ;
  190         sc->sc_mcwrite = RTC_WRITE;
  191         /* The TOD clock year 0 is 0. */
  192         sc->sc_year0 = 0;
  193         /*
  194          * For ISA use the default century get/set functions, for EBus we
  195          * provide our own versions.
  196          */
  197         sc->sc_flag = MC146818_NO_CENT_ADJUST;
  198         if (ebus) {
  199                 /*
  200                  * Make sure the CR is at the default location (also used
  201                  * by Solaris).
  202                  */
  203                 RTC_WRITE(dev, MC_REGA, PC87317_APC);
  204                 RTC_WRITE(dev, PC87317_APC_CADDR, PC87317_APC_CADDR_BANK1 |
  205                     PC87317_RTC_CR);
  206                 RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
  207                 sc->sc_getcent = pc87317_getcent;
  208                 sc->sc_setcent = pc87317_setcent;
  209         }
  210         if ((error = mc146818_attach(dev)) != 0) {
  211                 device_printf(dev, "cannot attach time of day clock\n");
  212                 goto fail_res;
  213         }
  214 
  215         if (bootverbose) {
  216                 if (mc146818_gettime(dev, &ts) != 0)
  217                         device_printf(dev, "invalid time");
  218                 else
  219                         device_printf(dev, "current time: %ld.%09ld\n",
  220                             (long)ts.tv_sec, ts.tv_nsec);
  221         }
  222 
  223         return (0);
  224 
  225  fail_res:
  226         bus_release_resource(dev, ebus ? SYS_RES_MEMORY : SYS_RES_IOPORT, rid,
  227             res);
  228  fail_mtx:
  229         mtx_destroy(&sc->sc_mtx);
  230 
  231         return (error);
  232 }
  233 
  234 static u_int
  235 pc87317_getcent(device_t dev)
  236 {
  237         u_int cent;
  238 
  239         RTC_WRITE(dev, MC_REGA, PC87317_RTC);
  240         cent = RTC_READ(dev, PC87317_RTC_CR);
  241         RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
  242         return (cent);
  243 }
  244 
  245 static void
  246 pc87317_setcent(device_t dev, u_int cent)
  247 {
  248 
  249         RTC_WRITE(dev, MC_REGA, PC87317_RTC);
  250         RTC_WRITE(dev, PC87317_RTC_CR, cent);
  251         RTC_WRITE(dev, MC_REGA, PC87317_COMMON);
  252 }

Cache object: 30bcdf83bb0c6cd9e0802eb7135558f4


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