1/*	$NetBSD: power.c,v 1.18 2011/07/17 23:18:23 mrg 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 1.18 2011/07/17 23:18:23 mrg 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
54volatile uint8_t *power_reg;
55
56static int powermatch(device_t, cfdata_t, void *);
57static void powerattach(device_t, device_t, void *);
58
59CFATTACH_DECL_NEW(power, 0, powermatch, powerattach, NULL, NULL);
60
61/*
62 * This is the driver for the "power" register available on some Sun4m
63 * machines. This allows the machine to remove power automatically when
64 * shutdown or halted or whatever.
65 */
66
67static int
68powermatch(device_t parent, cfdata_t cf, void *aux)
69{
70	union obio_attach_args *uoba = aux;
71	struct sbus_attach_args *sa = &uoba->uoba_sbus;
72
73	if (uoba->uoba_isobio4 != 0)
74		return (0);
75
76	return (strcmp("power", sa->sa_name) == 0);
77}
78
79/* ARGSUSED */
80static void
81powerattach(device_t parent, device_t self, void *aux)
82{
83	union obio_attach_args *uoba = aux;
84	struct sbus_attach_args *sa = &uoba->uoba_sbus;
85	bus_space_handle_t bh;
86
87	/* Map the power configuration register. */
88	if (sbus_bus_map(sa->sa_bustag,
89			 sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
90			 BUS_SPACE_MAP_LINEAR, &bh) != 0) {
91		printf("%s: cannot map register\n", device_xname(self));
92		return;
93	}
94	power_reg = (volatile uint8_t *)bh;
95
96	printf("\n");
97}
98
99void
100powerdown(void)
101{
102	/* Only try if the power node was attached. */
103	if (power_reg != NULL)
104		*POWER_REG |= POWER_OFF;
105
106	/*
107	 * don't return too quickly; the PROMs on some sparcs
108	 * report the powerdown as failed if we do.
109	 */
110	DELAY(1000000);
111}
112