sys/arch/sparc/dev/power.c

   1 /*      $NetBSD: power.c,v 1.16 2003/07/15 00:04:56 lukem Exp $ */
   2
   3 /*
   4  * Copyright (c) 1996
   5  *      The President and Fellows of Harvard College. All rights reserved.
   6  *
   7  * All advertising materials mentioning features or use of this software
   8  * must display the following acknowledgement:
   9  *      This product includes software developed by Aaron Brown and
  10  *      Harvard University.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  *
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by Harvard University
  24  *      and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: power.c,v 1.16 2003/07/15 00:04:56 lukem Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/device.h>
  47 #include <sys/kernel.h>
  48 #include <sys/systm.h>
  49
  50 #include <machine/autoconf.h>
  51
  52 #include <sparc/dev/power.h>
  53
  54 static int powermatch(struct device *, struct cfdata *, void *);
  55 static void powerattach(struct device *, struct device *, void *);
  56
  57 CFATTACH_DECL(power, sizeof(struct device),
  58     powermatch, powerattach, NULL, NULL);
  59
  60 /*
  61  * This is the driver for the "power" register available on some Sun4m
  62  * machines. This allows the machine to remove power automatically when
  63  * shutdown or halted or whatever.
  64  */
  65
  66 static int
  67 powermatch(struct device *parent, struct cfdata *cf, void *aux)
  68 {
  69         union obio_attach_args *uoba = aux;
  70         struct sbus_attach_args *sa = &uoba->uoba_sbus;
  71
  72         if (uoba->uoba_isobio4 != 0)
  73                 return (0);
  74
  75         return (strcmp("power", sa->sa_name) == 0);
  76 }
  77
  78 /* ARGSUSED */
  79 static void
  80 powerattach(struct device *parent, struct device *self, void *aux)
  81 {
  82         union obio_attach_args *uoba = aux;
  83         struct sbus_attach_args *sa = &uoba->uoba_sbus;
  84         bus_space_handle_t bh;
  85
  86         /* Map the power configuration register. */
  87         if (sbus_bus_map(sa->sa_bustag,
  88                          sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
  89                          BUS_SPACE_MAP_LINEAR, &bh) != 0) {
  90                 printf("%s: cannot map register\n", self->dv_xname);
  91                 return;
  92         }
  93         power_reg = (volatile uint8_t *)bh;
  94
  95         printf("\n");
  96 }
  97
  98 void
  99 powerdown(void)
 100 {
 101         /* Only try if the power node was attached. */
 102         if (power_reg != NULL)
 103                 *POWER_REG |= POWER_OFF;
 104
 105         /*
 106          * don't return too quickly; the PROMs on some sparcs
 107          * report the powerdown as failed if we do.
 108          */
 109         DELAY(1000000);
 110 }