1 /* $NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt 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 1.19 2012/07/29 00:04:05 matt 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 volatile uint8_t *power_reg;
55
56 static int powermatch(device_t, cfdata_t, void *);
57 static void powerattach(device_t, device_t, void *);
58
59 CFATTACH_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
67 static int
powermatch(device_t parent,cfdata_t cf,void * aux)68 powermatch(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 */
80 static void
powerattach(device_t parent,device_t self,void * aux)81 powerattach(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
99 void
powerdown(void)100 powerdown(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