112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* $NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt Exp $ */
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/*
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* Copyright (c) 1996
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* The President and Fellows of Harvard College. All rights reserved.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Aaron Brown and
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* Harvard University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Harvard University
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* and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: power.c,v 1.19 2012/07/29 00:04:05 matt Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <machine/autoconf.h>
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#include <sparc/dev/power.h>
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volatile uint8_t *power_reg;
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static int powermatch(device_t, cfdata_t, void *);
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static void powerattach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(power, 0, powermatch, powerattach, NULL, NULL);
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/*
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* This is the driver for the "power" register available on some Sun4m
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* machines. This allows the machine to remove power automatically when
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* shutdown or halted or whatever.
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*/
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static int
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powermatch(device_t parent, cfdata_t cf, void *aux)
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{
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union obio_attach_args *uoba = aux;
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struct sbus_attach_args *sa = &uoba->uoba_sbus;
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if (uoba->uoba_isobio4 != 0)
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return (0);
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return (strcmp("power", sa->sa_name) == 0);
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}
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/* ARGSUSED */
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static void
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powerattach(device_t parent, device_t self, void *aux)
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{
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union obio_attach_args *uoba = aux;
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struct sbus_attach_args *sa = &uoba->uoba_sbus;
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bus_space_handle_t bh;
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/* Map the power configuration register. */
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if (sbus_bus_map(sa->sa_bustag,
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sa->sa_slot, sa->sa_offset, sizeof(uint8_t),
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BUS_SPACE_MAP_LINEAR, &bh) != 0) {
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printf("%s: cannot map register\n", device_xname(self));
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return;
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}
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power_reg = (volatile uint8_t *)bh;
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printf("\n");
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}
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void
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powerdown(void)
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{
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/* Only try if the power node was attached. */
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if (power_reg != NULL)
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*POWER_REG |= POWER_OFF;
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/*
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* don't return too quickly; the PROMs on some sparcs
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* report the powerdown as failed if we do.
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*/
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DELAY(1000000);
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}
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