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98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* $NetBSD: apc.c,v 1.1 2010/01/15 20:57:12 bouyer Exp $ */
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/*
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* Copyright (c) 2010 Manuel Bouyer.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: apc.c,v 1.1 2010/01/15 20:57:12 bouyer Exp $");
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/*
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* driver for the power management functions of the Aurora Personality Chip
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* on SPARCstation-4/5 and derivatives
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/device.h>
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#include <sys/bus.h>
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#include <machine/autoconf.h>
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#include <sparc/dev/apcreg.h>
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static int apcmatch(device_t, struct cfdata *, void *);
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static void apcattach(device_t, device_t, void *);
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static void apc_cpu_sleep(struct cpu_info *);
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struct apc_softc {
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device_t sc_dev;
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bus_space_tag_t sc_bt;
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bus_space_handle_t sc_bh;
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};
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struct apc_softc *apc = NULL;
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CFATTACH_DECL_NEW(apc, sizeof(struct apc_softc),
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apcmatch, apcattach, NULL, NULL);
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static int
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apcmatch(device_t parent, struct cfdata *cf, void *aux)
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{
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struct sbus_attach_args *sa = aux;
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if (apc != NULL) /* only one instance */
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return 0;
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return strcmp("power-management", sa->sa_name) == 0;
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}
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static void
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apcattach(device_t parent, device_t self, void *aux)
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{
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struct sbus_attach_args *sa = aux;
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struct apc_softc *sc = device_private(self);
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sc->sc_bt = sa->sa_bustag;
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if (sbus_bus_map(sa->sa_bustag,
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sa->sa_slot, sa->sa_offset, APC_REG_SIZE, 0, &sc->sc_bh) != 0) {
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aprint_error(": cannot map registers\n");
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return;
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}
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aprint_normal("\n");
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apc = sc;
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curcpu()->idlespin = apc_cpu_sleep;
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}
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static void
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apc_cpu_sleep(struct cpu_info *ci)
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{
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uint8_t val;
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if (apc == NULL)
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return;
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val = bus_space_read_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG);
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bus_space_write_1(apc->sc_bt, apc->sc_bh, APC_IDLE_REG,
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val | APC_IDLE_REG_IDLE);
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}
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