/*      $NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt Exp $ */

/*
* Copyright (c) 1996
*      The President and Fellows of Harvard College. All rights reserved.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by Aaron Brown and
*      Harvard University.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Harvard University
*      and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
__KERNEL_RCSID(0, "$NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>

#include <machine/autoconf.h>

#include <sparc/dev/power.h>

volatile uint8_t *power_reg;

static int powermatch(device_t, cfdata_t, void *);
static void powerattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(power, 0, powermatch, powerattach, NULL, NULL);

/*
* This is the driver for the "power" register available on some Sun4m
* machines. This allows the machine to remove power automatically when
* shutdown or halted or whatever.
*/

static int
powermatch(device_t parent, cfdata_t cf, void *aux)
{
       union obio_attach_args *uoba = aux;
       struct sbus_attach_args *sa = &uoba->uoba_sbus;

       if (uoba->uoba_isobio4 != 0)
               return (0);

       return (strcmp("power", sa->sa_name) == 0);
}

/* ARGSUSED */
static void
powerattach(device_t parent, device_t self, void *aux)
{
       union obio_attach_args *uoba = aux;
       struct sbus_attach_args *sa = &uoba->uoba_sbus;
       bus_space_handle_t bh;

       /* Map the power configuration register. */
       if (sbus_bus_map(sa->sa_bustag,
                        sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
                        BUS_SPACE_MAP_LINEAR, &bh) != 0) {
               printf("%s: cannot map register\n", device_xname(self));
               return;
       }
       power_reg = (volatile uint8_t *)bh;

       printf("\n");
}

void
powerdown(void)
{
       /* Only try if the power node was attached. */
       if (power_reg != NULL)
               *POWER_REG |= POWER_OFF;

       /*
        * don't return too quickly; the PROMs on some sparcs
        * report the powerdown as failed if we do.
        */
       DELAY(1000000);
}