Home | History | Annotate | Line # | Download | only in dev
power.c revision 1.18 
      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