1 /* $NetBSD: power.c,v 1.15 2002/10/02 16:02:16 thorpej 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 CFATTACH_DECL(power, sizeof(struct device), 55 powermatch, powerattach, NULL, NULL); 56 57 /* 58 * This is the driver for the "power" register available on some Sun4m 59 * machines. This allows the machine to remove power automatically when 60 * shutdown or halted or whatever. 61 */ 62 63 static int 64 powermatch(parent, cf, aux) 65 struct device *parent; 66 struct cfdata *cf; 67 void *aux; 68 { 69 union obio_attach_args *uoba = aux; 70 struct sbus_attach_args *sa = &uoba->uoba_sbus; 71 72 if (uoba->uoba_isobio4 != 0) 73 return (0); 74 75 return (strcmp("power", sa->sa_name) == 0); 76 } 77 78 /* ARGSUSED */ 79 static void 80 powerattach(parent, self, aux) 81 struct device *parent, *self; 82 void *aux; 83 { 84 union obio_attach_args *uoba = aux; 85 struct sbus_attach_args *sa = &uoba->uoba_sbus; 86 bus_space_handle_t bh; 87 88 /* Map the power configuration register. */ 89 if (sbus_bus_map(sa->sa_bustag, 90 sa->sa_slot, sa->sa_offset, sizeof(u_int8_t), 91 BUS_SPACE_MAP_LINEAR, &bh) != 0) { 92 printf("%s: cannot map register\n", self->dv_xname); 93 return; 94 } 95 power_reg = (volatile u_int8_t *)bh; 96 97 printf("\n"); 98 } 99 100 void 101 powerdown() 102 { 103 /* Only try if the power node was attached. */ 104 if (power_reg != NULL) 105 *POWER_REG |= POWER_OFF; 106 107 /* 108 * don't return too quickly; the PROMs on some sparcs 109 * report the powerdown as failed if we do. 110 */ 111 DELAY(1000000); 112 } 113