1 /* $NetBSD: power.c,v 1.16 2003/07/15 00:04:56 lukem 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 1.16 2003/07/15 00:04:56 lukem 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 static int powermatch __P((struct device *, struct cfdata *, void *)); 55 static void powerattach __P((struct device *, struct device *, void *)); 56 57 CFATTACH_DECL(power, sizeof(struct device), 58 powermatch, powerattach, NULL, NULL); 59 60 /* 61 * This is the driver for the "power" register available on some Sun4m 62 * machines. This allows the machine to remove power automatically when 63 * shutdown or halted or whatever. 64 */ 65 66 static int 67 powermatch(parent, cf, aux) 68 struct device *parent; 69 struct cfdata *cf; 70 void *aux; 71 { 72 union obio_attach_args *uoba = aux; 73 struct sbus_attach_args *sa = &uoba->uoba_sbus; 74 75 if (uoba->uoba_isobio4 != 0) 76 return (0); 77 78 return (strcmp("power", sa->sa_name) == 0); 79 } 80 81 /* ARGSUSED */ 82 static void 83 powerattach(parent, self, aux) 84 struct device *parent, *self; 85 void *aux; 86 { 87 union obio_attach_args *uoba = aux; 88 struct sbus_attach_args *sa = &uoba->uoba_sbus; 89 bus_space_handle_t bh; 90 91 /* Map the power configuration register. */ 92 if (sbus_bus_map(sa->sa_bustag, 93 sa->sa_slot, sa->sa_offset, sizeof(u_int8_t), 94 BUS_SPACE_MAP_LINEAR, &bh) != 0) { 95 printf("%s: cannot map register\n", self->dv_xname); 96 return; 97 } 98 power_reg = (volatile u_int8_t *)bh; 99 100 printf("\n"); 101 } 102 103 void 104 powerdown() 105 { 106 /* Only try if the power node was attached. */ 107 if (power_reg != NULL) 108 *POWER_REG |= POWER_OFF; 109 110 /* 111 * don't return too quickly; the PROMs on some sparcs 112 * report the powerdown as failed if we do. 113 */ 114 DELAY(1000000); 115 } 116