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 54 static int powermatch(device_t, cfdata_t, void *); 55 static void powerattach(device_t, device_t, void *); 56 57 CFATTACH_DECL_NEW(power, 0, powermatch, powerattach, NULL, NULL); 58 59 /* 60 * This is the driver for the "power" register available on some Sun4m 61 * machines. This allows the machine to remove power automatically when 62 * shutdown or halted or whatever. 63 */ 64 65 static int 66 powermatch(device_t parent, cfdata_t cf, void *aux) 67 { 68 union obio_attach_args *uoba = aux; 69 struct sbus_attach_args *sa = &uoba->uoba_sbus; 70 71 if (uoba->uoba_isobio4 != 0) 72 return (0); 73 74 return (strcmp("power", sa->sa_name) == 0); 75 } 76 77 /* ARGSUSED */ 78 static void 79 powerattach(device_t parent, device_t self, void *aux) 80 { 81 union obio_attach_args *uoba = aux; 82 struct sbus_attach_args *sa = &uoba->uoba_sbus; 83 bus_space_handle_t bh; 84 85 /* Map the power configuration register. */ 86 if (sbus_bus_map(sa->sa_bustag, 87 sa->sa_slot, sa->sa_offset, sizeof(uint8_t), 88 BUS_SPACE_MAP_LINEAR, &bh) != 0) { 89 printf("%s: cannot map register\n", device_xname(self)); 90 return; 91 } 92 power_reg = (volatile uint8_t *)bh; 93 94 printf("\n"); 95 } 96 97 void 98 powerdown(void) 99 { 100 /* Only try if the power node was attached. */ 101 if (power_reg != NULL) 102 *POWER_REG |= POWER_OFF; 103 104 /* 105 * don't return too quickly; the PROMs on some sparcs 106 * report the powerdown as failed if we do. 107 */ 108 DELAY(1000000); 109 } 110