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      1 /*	$NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt 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 1.19 2012/07/29 00:04:05 matt 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 volatile uint8_t *power_reg;
     55 
     56 static int powermatch(device_t, cfdata_t, void *);
     57 static void powerattach(device_t, device_t, void *);
     58 
     59 CFATTACH_DECL_NEW(power, 0, powermatch, powerattach, NULL, NULL);
     60 
     61 /*
     62  * This is the driver for the "power" register available on some Sun4m
     63  * machines. This allows the machine to remove power automatically when
     64  * shutdown or halted or whatever.
     65  */
     66 
     67 static int
     68 powermatch(device_t parent, cfdata_t cf, 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(device_t parent, device_t self, void *aux)
     82 {
     83 	union obio_attach_args *uoba = aux;
     84 	struct sbus_attach_args *sa = &uoba->uoba_sbus;
     85 	bus_space_handle_t bh;
     86 
     87 	/* Map the power configuration register. */
     88 	if (sbus_bus_map(sa->sa_bustag,
     89 			 sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
     90 			 BUS_SPACE_MAP_LINEAR, &bh) != 0) {
     91 		printf("%s: cannot map register\n", device_xname(self));
     92 		return;
     93 	}
     94 	power_reg = (volatile uint8_t *)bh;
     95 
     96 	printf("\n");
     97 }
     98 
     99 void
    100 powerdown(void)
    101 {
    102 	/* Only try if the power node was attached. */
    103 	if (power_reg != NULL)
    104 		*POWER_REG |= POWER_OFF;
    105 
    106 	/*
    107 	 * don't return too quickly; the PROMs on some sparcs
    108 	 * report the powerdown as failed if we do.
    109 	 */
    110 	DELAY(1000000);
    111 }
    112