1 /* $NetBSD: power.c,v 1.12 2002/03/11 16:27:02 pk 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/param.h> 43 #include <sys/device.h> 44 #include <sys/kernel.h> 45 #include <sys/systm.h> 46 47 #include <machine/autoconf.h> 48 49 #include <sparc/dev/power.h> 50 51 static int powermatch __P((struct device *, struct cfdata *, void *)); 52 static void powerattach __P((struct device *, struct device *, void *)); 53 54 struct cfattach power_ca = { 55 sizeof(struct device), powermatch, powerattach 56 }; 57 58 /* 59 * This is the driver for the "power" register available on some Sun4m 60 * machines. This allows the machine to remove power automatically when 61 * shutdown or halted or whatever. 62 */ 63 64 static int 65 powermatch(parent, cf, aux) 66 struct device *parent; 67 struct cfdata *cf; 68 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 81 powerattach(parent, self, aux) 82 struct device *parent, *self; 83 void *aux; 84 { 85 union obio_attach_args *uoba = aux; 86 struct sbus_attach_args *sa = &uoba->uoba_sbus; 87 bus_space_handle_t bh; 88 89 /* Map the power configuration register. */ 90 if (sbus_bus_map(sa->sa_bustag, 91 sa->sa_slot, sa->sa_offset, sizeof(u_int8_t), 92 BUS_SPACE_MAP_LINEAR, &bh) != 0) { 93 printf("%s: cannot map register\n", self->dv_xname); 94 return; 95 } 96 power_reg = (volatile u_int8_t *)bh; 97 98 printf("\n"); 99 } 100 101 void 102 powerdown() 103 { 104 /* Only try if the power node was attached. */ 105 if (power_reg != NULL) 106 *POWER_REG |= POWER_OFF; 107 108 /* 109 * don't return too quickly; the PROMs on some sparcs 110 * report the powerdown as failed if we do. 111 */ 112 DELAY(1000000); 113 } 114