FreeBSD/Linux Kernel Cross Reference
sys/pc98/cbus/pcrtc.c

     /*-
      * Copyright (c) 2008 TAKAHASHI Yoshihiro
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/clock.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <pc98/cbus/cbus.h>
    #include <isa/isavar.h>
    
    /*
     * modified for PC98 by Kakefuda
     */
    
    /*
     * RTC support routines
     */
    
    static void rtc_serialcombit(int);
    static void rtc_serialcom(int);
    static int rtc_inb(void);
    static void rtc_outb(int);
    
    static void
    rtc_serialcombit(int i)
    {
            outb(IO_RTC, ((i&0x01)<<5)|0x07);
            DELAY(1);
            outb(IO_RTC, ((i&0x01)<<5)|0x17);
            DELAY(1);
            outb(IO_RTC, ((i&0x01)<<5)|0x07);
            DELAY(1);
    }
    
    static void
    rtc_serialcom(int i)
    {
            rtc_serialcombit(i&0x01);
            rtc_serialcombit((i&0x02)>>1);
            rtc_serialcombit((i&0x04)>>2);
            rtc_serialcombit((i&0x08)>>3);
            outb(IO_RTC, 0x07);
            DELAY(1);
            outb(IO_RTC, 0x0f);
            DELAY(1);
            outb(IO_RTC, 0x07);
            DELAY(1);
    }
    
    static void
    rtc_outb(int val)
    {
            int s;
            int sa = 0;
    
            for (s=0;s<8;s++) {
                sa = ((val >> s) & 0x01) ? 0x27 : 0x07;
                outb(IO_RTC, sa);           /* set DI & CLK 0 */
                DELAY(1);
                outb(IO_RTC, sa | 0x10);    /* CLK 1 */
                DELAY(1);
            }
            outb(IO_RTC, sa & 0xef);        /* CLK 0 */
    }
    
    static int
    rtc_inb(void)
    {
            int s;
           int sa = 0;
   
           for (s=0;s<8;s++) {
               sa |= ((inb(0x33) & 0x01) << s);
               outb(IO_RTC, 0x17); /* CLK 1 */
               DELAY(1);
               outb(IO_RTC, 0x07); /* CLK 0 */
               DELAY(2);
           }
           return sa;
   }
   
   /**********************************************************************
    * RTC driver for subr_rtc
    */
   
   #include "clock_if.h"
   
   #include <sys/rman.h>
   
   struct pcrtc_softc {
           int port_rid1, port_rid2;
           struct resource *port_res1, *port_res2;
   };
   
   /*
    * Attach to the ISA PnP descriptors for the timer and realtime clock.
    */
   static struct isa_pnp_id pcrtc_ids[] = {
           { 0x000bd041 /* PNP0B00 */, "AT realtime clock" },
           { 0 }
   };
   
   static int
   pcrtc_probe(device_t dev)
   {
           int result;
   
           device_set_desc(dev, "PC Real Time Clock");
           result = ISA_PNP_PROBE(device_get_parent(dev), dev, pcrtc_ids);
           /* ENXIO if wrong PnP-ID, ENOENT ifno PnP-ID, zero if good PnP-iD */
           if (result != ENOENT)
                   return(result);
           /* All PC's have an RTC, and we're hosed without it, so... */
           return (BUS_PROBE_LOW_PRIORITY);
   }
   
   static int
   pcrtc_attach(device_t dev)
   {
           struct pcrtc_softc *sc;
   
           /*
            * Not that we need them or anything, but grab our resources
            * so they show up, correctly attributed, in the big picture.
            */
           sc = device_get_softc(dev);
           sc->port_rid1 = 0;
           bus_set_resource(dev, SYS_RES_IOPORT, sc->port_rid1, IO_RTC, 1);
           if (!(sc->port_res1 = bus_alloc_resource(dev, SYS_RES_IOPORT,
               &sc->port_rid1, IO_RTC, IO_RTC, 1, RF_ACTIVE)))
                   device_printf(dev, "Warning: Couldn't map I/O.\n");
           sc->port_rid2 = 1;
           bus_set_resource(dev, SYS_RES_IOPORT, sc->port_rid2, 0x33, 1);
           if (!(sc->port_res2 = bus_alloc_resource(dev, SYS_RES_IOPORT,
               &sc->port_rid2, 0x33, 0x33, 1, RF_ACTIVE)))
                   device_printf(dev, "Warning: Couldn't map I/O.\n");
   
           clock_register(dev, 1000000);
           return(0);
   }
   
   static int
   pcrtc_settime(device_t dev __unused, struct timespec *ts)
   {
           struct clocktime ct;
   
           clock_ts_to_ct(ts, &ct);
   
           rtc_serialcom(0x01);    /* Register shift command. */
   
           rtc_outb(bin2bcd(ct.sec));              /* Write back Seconds */
           rtc_outb(bin2bcd(ct.min));              /* Write back Minutes */
           rtc_outb(bin2bcd(ct.hour));             /* Write back Hours   */
   
           rtc_outb(bin2bcd(ct.day));              /* Write back Day     */
           rtc_outb((ct.mon << 4) | ct.dow);       /* Write back Month and DOW */
           rtc_outb(bin2bcd(ct.year % 100));       /* Write back Year    */
   
           rtc_serialcom(0x02);    /* Time set & Counter hold command. */
           rtc_serialcom(0x00);    /* Register hold command. */
   
           return (0);
   }
   
   static int
   pcrtc_gettime(device_t dev, struct timespec *ts)
   {
           struct clocktime ct;
           int i;
   
           rtc_serialcom(0x03);    /* Time Read */
           rtc_serialcom(0x01);    /* Register shift command. */
           DELAY(20);
   
           ct.nsec = 0;
           ct.sec = bcd2bin(rtc_inb() & 0xff);             /* sec */
           ct.min = bcd2bin(rtc_inb() & 0xff);             /* min */
           ct.hour = bcd2bin(rtc_inb() & 0xff);            /* hour */
           ct.day = bcd2bin(rtc_inb() & 0xff);             /* date */
           i = rtc_inb();
           ct.dow = i & 0x0f;                              /* dow */
           ct.mon = (i >> 4) & 0x0f;                       /* month */
           ct.year = bcd2bin(rtc_inb() & 0xff) + 1900;     /* year */
           if (ct.year < 1995)
                   ct.year += 100;
   
           /* Set dow = -1 because some clocks don't set it correctly. */
           ct.dow = -1;
   
           return (clock_ct_to_ts(&ct, ts));
   }
   
   static device_method_t pcrtc_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         pcrtc_probe),
           DEVMETHOD(device_attach,        pcrtc_attach),
           DEVMETHOD(device_detach,        bus_generic_detach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
                   /* XXX stop statclock? */
           DEVMETHOD(device_resume,        bus_generic_resume),
                   /* XXX restart statclock? */
   
           /* clock interface */
           DEVMETHOD(clock_gettime,        pcrtc_gettime),
           DEVMETHOD(clock_settime,        pcrtc_settime),
   
           { 0, 0 }
   };
   
   static driver_t pcrtc_driver = {
           "pcrtc",
           pcrtc_methods,
           sizeof(struct pcrtc_softc),
   };
   
   static devclass_t pcrtc_devclass;
   
   DRIVER_MODULE(pcrtc, isa, pcrtc_driver, pcrtc_devclass, 0, 0);

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