1/*	$NetBSD: apc.c,v 1.2 2019/12/30 22:13:46 ad Exp $	*/
2
3/*
4 * Copyright (c) 2010 Manuel Bouyer.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__KERNEL_RCSID(0, "$NetBSD: apc.c,v 1.2 2019/12/30 22:13:46 ad Exp $");
29
30
31/*
32 * driver for the power management functions of the Aurora Personality Chip
33 * on SPARCstation-4/5 and derivatives
34 */
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/errno.h>
39#include <sys/device.h>
40#include <sys/bus.h>
41
42#include <machine/autoconf.h>
43
44#include <sparc/dev/apcreg.h>
45
46static int apcmatch(device_t, struct cfdata *, void *);
47static void apcattach(device_t, device_t, void *);
48static void apc_cpu_sleep(void);
49
50struct apc_softc {
51	device_t	sc_dev;
52	bus_space_tag_t	sc_bt;
53	bus_space_handle_t sc_bh;
54};
55
56struct apc_softc *apc = NULL;
57
58CFATTACH_DECL_NEW(apc, sizeof(struct apc_softc),
59    apcmatch, apcattach, NULL, NULL);
60
61
62static int
63apcmatch(device_t parent, struct cfdata *cf, void *aux)
64{
65	struct sbus_attach_args *sa = aux;
66	if (apc != NULL) /* only one instance */
67		return 0;
68	return strcmp("power-management", sa->sa_name) == 0;
69}
70
71static void
72apcattach(device_t parent, device_t self, void *aux)
73{
74	struct sbus_attach_args *sa = aux;
75	struct apc_softc *sc = device_private(self);
76
77	sc->sc_bt = sa->sa_bustag;
78	if (sbus_bus_map(sa->sa_bustag,
79	    sa->sa_slot, sa->sa_offset, APC_REG_SIZE, 0, &sc->sc_bh) != 0) {
80		aprint_error(": cannot map registers\n");
81		return;
82	}
83	aprint_normal("\n");
84	apc = sc;
85	curcpu()->idlespin = apc_cpu_sleep;
86}
87
88static void
89apc_cpu_sleep(void)
90{
91	uint8_t val;
92	if (apc == NULL)
93		return;
94	val = bus_space_read_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG);
95	bus_space_write_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG,
96	    val | APC_IDLE_REG_IDLE);
97}
98