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