110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* $NetBSD: fdt_syscon.c,v 1.3 2018/06/30 20:16:56 jmcneill Exp $ */
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/*-
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* Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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: fdt_syscon.c,v 1.3 2018/06/30 20:16:56 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/queue.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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struct syscon;
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struct fdtbus_syscon {
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device_t sc_dev;
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int sc_phandle;
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struct syscon *sc_syscon;
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LIST_ENTRY(fdtbus_syscon) sc_next;
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};
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static LIST_HEAD(, fdtbus_syscon) fdtbus_syscons =
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LIST_HEAD_INITIALIZER(fdtbus_syscons);
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int
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fdtbus_register_syscon(device_t dev, int phandle,
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struct syscon *syscon)
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{
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struct fdtbus_syscon *sc;
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sc = kmem_alloc(sizeof(*sc), KM_SLEEP);
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sc->sc_dev = dev;
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sc->sc_phandle = phandle;
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sc->sc_syscon = syscon;
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LIST_INSERT_HEAD(&fdtbus_syscons, sc, sc_next);
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return 0;
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}
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static struct fdtbus_syscon *
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fdtbus_get_syscon(int phandle)
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{
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struct fdtbus_syscon *sc;
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LIST_FOREACH(sc, &fdtbus_syscons, sc_next) {
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if (sc->sc_phandle == phandle)
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return sc;
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}
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return NULL;
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}
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struct syscon *
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fdtbus_syscon_acquire(int phandle, const char *prop)
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{
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struct fdtbus_syscon *sc;
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int sc_phandle;
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sc_phandle = fdtbus_get_phandle(phandle, prop);
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if (sc_phandle < 0)
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return NULL;
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sc = fdtbus_get_syscon(sc_phandle);
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if (sc == NULL)
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return NULL;
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return sc->sc_syscon;
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}
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struct syscon *
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fdtbus_syscon_lookup(int phandle)
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{
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struct fdtbus_syscon *sc;
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sc = fdtbus_get_syscon(phandle);
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if (sc == NULL)
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return NULL;
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return sc->sc_syscon;
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}
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