sys/platform/pc32/isa/pmtimer.c

   1 /*-
   2  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@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 /*
  28  * Timer device driver for power management events.
  29  * The code for suspend/resume is derived from APM device driver.
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35 #include <sys/kernel.h>
  36 #include <sys/syslog.h>
  37 #include <sys/thread2.h>
  38 #include <machine/clock.h>
  39
  40 #include <bus/isa/isavar.h>
  41
  42 static devclass_t pmtimer_devclass;
  43
  44 /* reject any PnP devices for now */
  45 static struct isa_pnp_id pmtimer_ids[] = {
  46         {0}
  47 };
  48
  49 static int
  50 pmtimer_probe(device_t dev)
  51 {
  52
  53         if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
  54                 return (ENXIO);
  55         }
  56
  57         /* only one instance always */
  58         return (device_get_unit(dev));
  59 }
  60
  61 static struct timeval suspend_time;
  62 static struct timeval diff_time;
  63
  64 static int
  65 pmtimer_suspend(device_t dev)
  66 {
  67         crit_enter();
  68         microtime(&diff_time);
  69         inittodr(0);
  70         microtime(&suspend_time);
  71         timevalsub(&diff_time, &suspend_time);
  72         crit_exit();
  73         return (0);
  74 }
  75
  76 static int
  77 pmtimer_resume(device_t dev)
  78 {
  79         u_int second, minute, hour;
  80         struct timeval resume_time;
  81
  82         /* modified for adjkerntz */
  83         crit_enter();
  84         timer_restore();                /* restore the all timers */
  85         inittodr(0);                    /* adjust time to RTC */
  86         microtime(&resume_time);
  87
  88         crit_exit();
  89         second = resume_time.tv_sec - suspend_time.tv_sec;
  90         hour = second / 3600;
  91         second %= 3600;
  92         minute = second / 60;
  93         second %= 60;
  94         log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
  95                 hour, minute, second);
  96         return (0);
  97 }
  98
  99 /*
 100  * Because pmtimer is a static device that always exists under any attached
 101  * isa device, and not scanned by the isa device, we need an identify
 102  * function to install the device.
 103  */
 104 static device_method_t pmtimer_methods[] = {
 105         /* Device interface */
 106         DEVMETHOD(device_identify,      bus_generic_identify),
 107         DEVMETHOD(device_probe,         pmtimer_probe),
 108         DEVMETHOD(device_attach,        bus_generic_attach),
 109         DEVMETHOD(device_suspend,       pmtimer_suspend),
 110         DEVMETHOD(device_resume,        pmtimer_resume),
 111         { 0, 0 }
 112 };
 113
 114 static driver_t pmtimer_driver = {
 115         "pmtimer",
 116         pmtimer_methods,
 117         1,              /* no softc */
 118 };
 119
 120 DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);